| Revista de chimie |
Luna : *.* Anul : *.*
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| Analiza dispersa a tufului vulcanic analcitic si caracterizarea fractiunilor I. Analiza dispersa |
| In the paper the disperse analysis of Nereju-Vrancea (Romania) analcitic volcanic tuff has been carried out by screening and optical microscopy. Particles sizes ranged between 0,0425-0,715 mm. The number distribution curves have been drawn: the histogram, |
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| Cinetica descompunerii termice a selenitilor de magneziu, strontiu si bariu |
The paper presents the results concerning the thermal decomposition of the second group slenites. For the SrSeO3 the non-isothermal kinetic paramaters were evaluated using integral methods. The structural characteristics were determined from IR spectra.
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| Cinetica sorbtiei hidroxocationilor de Fe(III) de catre schimbatorii de anioni puternic bazici |
| The paper presents the research results on the sorption kinetics of Fe (III) hydrolyzed ions from sulphate solutions by extremely basic anion exchangers of type I (AV-17) and II (Varion-AD). Sorption process was observed in static conditions at 30 and |
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| Coeficienti individuali de transfer de masa in sisteme eterogene lichid-lichid |
| The Lewis cell, with some improvements, is an efficient way of determining the mass transfer coefficients in any ternary or multicomponent system. In this paper there were determined the individual coefficients for the water-acetone-carbon dichloride sy |
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| Compararea si clasificarea unor vinuri din Romania pe baza componentelor volatile determinate prin cromatografie de gaze headspace' cuplata cu spectrometria de masa |
| Twenty eight samples of different varieties of wine were analysed to determine their content of volatile compounds, using headspace gas chromatography - mass spectrometry (GC-MS). The majority of samples were from Alba Iulia area, three samples from Molda |
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| Consideratii privind solutiile tampon ionic - moleculare |
| For quantitative prediction of a behaviour of pX ionic-molecular buffer systems, the equations for account of a buffer capacity are introduced. The obtained relations enable to expect precisely buffer capacity values of all components of buffer ionic-mole |
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| Determinarea cantitativa a continutului de vitamina A palmitat din produse farmaceutice |
| In this paper there are presented the research results concerning the establishing of the optimal work conditions for the determination of the axerophtol (C20H30O) from children multivitamine syrup samples by high performance liquid chromatography. It was |
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| Determinarea grosimii microstratului bulei de vapori la fierberea amestecurilor binare |
| The influence of the microlayer which is formed under the vapour bubble, during its growth on the solid surface, is not very clear and there are still required some theoretical and experimental investigations on the way the microlayer is active on the boi |
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| Metoda simplificata de obtinere a 3-aril-5-mercapto-1,2,4-triazolilor |
| 1-Aroyl-thiosemicarbazides obtained by the reaction of thiosemicarbazide with substituted benzoyl chlorides had been cyclized in alkaline solution to the title compounds 3-aryl-5-mercapto-1,2,4-triazoles, which were characterized by IR, 1H-NMR and electro |
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| Model de determinare cu precizie a parametrilor retelei cristaline |
The paper presents a high accuracy calculation model of cubical crystaline network parameters. It was used a calculation program which allows the quick determination of the network constant from the experimental results obtained by X ray difractometry.
K |
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| Separarea amestecurilor eterogene. VII. Sedimentarea electrostatica: algoritmi de dimensionare si simulare |
| The result of a phenomenological model for the electrostatic precipitation is presented. Based on this model, an algorithm is developed for the geometry design of electrical filters starting from technological requirements or for the performance eval |
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| Sinteza 5-formil-etil-vanilinei si a unor derivati cu posibila actiune biologica |
| The 4-hydroxy-5-ethoxyisophtalic aldehyde (5-formyl ethyl vaniline) was synthesized by Duff reaction from ethyl-vaniline and hexamethylenetetramine. The dialdehyde was condensed with nitrogen bases (hydroxilamine, o-methylhydroxilamine, N,N-dimethylhydraz |
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| Sinteza si caracterizarea unor combinatii complexe cu liganzi macrociclici de tip criptand |
| This paper describes the synthesis and characterization of azacryptands and their complexes with metal ions: Cu(II), Ni(II). Azacryptands are obtained using <2+3> condensation of tris(2-aminoetil)amina (tren) and dicarbonilic compounds such as: iso |
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| Studii teoretice de conformatie si reactivitate in clasa diesterilor acidului carbonic |
| A conformational study on the energies and geometries of the stable conformers of dimethy carbonate, diphenyl carbonate, di-2-pyridyl carbonate, N,N'-disuccinimidyl carbonate, N,N'-diphthalimidyl carbonate and all the symmetrical isomers of bis(mononitrop |
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| Studiu comparativ privind stabilirea selenemiei prin determinare fluorimetrica a seleniului seric si prin determinarea cinetica a activitatii glutation peroxidazei |
| A study was initiated in this paper regarding the possibility to evaluate the body's selenium (Se) status. The analytical methods used consisted of the kinetic test for the glutathione peroxidase (GSH-Px) activity determination and the fluorimetric method |
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| Studiul descompunerii exoterme a unor nitroderivati fenilhidrazinici folosind metoda calorimetriei diferentiale cu scanare |
| Substances able to undergo exothermal chemical reactions may constitute hazards in various circumstances. Runaway and decomposition reactions in condensed phases contribute considerably to incidents in chemical plants as well as in other related areas. Fr |
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| Studiul influentei continutului de alumina asupra distributiei impuritatilor cu fier in amestecuri criolit-alumina |
| The influence of alumina Al2O3 on the distribution of iron impurities in cryolite-alumina melts was studied. Mixtures containing Na3AlF6 + Al2O3 + AlF3 + CaF2 in different proportions were prepared. The mixtures have been melted in a carbon crucible toget |
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| Unele consideratii privind corelarea compozitiei gazului petrolier lichefiat (GPL) cu temperatura mediului ambiant |
| The paper presents a study concerning the choice of LPG type considering the temperature of the storing and utilization environment. In order to use an LPG of binary mixture type, it is presented a simplified algorithm which allows the correlation stabili |
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| Utilizarea perlitului expandat pentru indepartarea prin flotatie a nichelului din solutii apoase diluate |
| The paper presents the separation of nickel from dilute aqueous solutions by flotation (dispersed-air flotation) using oleic acid as collector. Precipitate flotation and adsorbing colloid flotation, using activated expanded perlite as adsorbent, were inve |
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Separarea Bi(III) din sisteme apoase prin flotatie ionica
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| Bismuth is a metal with important applications in different industrial processes as well as in preparation of pharmaceutical products. The oxidic compounds of Bi(III) have special catalysis, electric and magnetic properties <1>. Some Bi(III) salts (carbo |
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| Aspecte privind comportamentul pirotinei hexagonale in timpul dizolvarii in mediu acid |
| The dissolution of pyrrhotine was investigated in pechloric medium at 60 degrees C temperature. Two distinct stages of pyrrhothine dissolution have been identified. Non-oxidative stage (approx. 0-2000s) is well described as a rapid release period of ferro |
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| Caracterizarea hidrolizatelor de colagen dopate cu ioni nde calciu/magneziu |
| Two types of collagenic hydrolysed compounds (HO2 and HO8) have been characterised, both were extracted from untreated cattle skin which had been kept within a neutral environment for 2 and 8 hours, respectively. A third type (HAP) is a collagenic hydrol |
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| Coloranti reactivi vinilsulfonici - derivati ai esterului monosulfuric al 2-(4-amino-benzensulfonil)-etanolului |
| the synthesis of reactive dyes with vinylsulphone groups will allow treating the theoretical and synthetically preparation problems concerning the synthesis of some bifucntional reactive dyes. This paper presents the synthesis of some vinylsulphone reacti |
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| Dimetil eter-combustibil ecologic pentru motoare Diesel |
| Dimethylether (DME) is idenfied as a clean new alternative fuel for diesel engines. Dme can provide very low emissions and totally smokeless diesel engine operation. A theoretical investigation of the DME fueled diesel engine has been carried for the sam |
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| Investigarea sintezei prin metoda sol-gel a unor sticle in sistemul ZnO-TiO2-SiO2 |
| The paper presents studies made for the obtaining of vitreous materials in ternary system ZnO-TiO2-SiO2 by sol-gel route. The system is of great interest in the field of toxic wastes incorporation and also for chemical protection coatings on several mat |
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| Modificari chimico-mineralogice ale argilelor sub actiunea fluidelor bazice |
| This paper presents a study of the alkaline fluid media on clay minerals in order to establish the structural and chemical composition changes. The importance of knowing these aspects is given by the application of different technologies in exploiting oil |
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| Procedura de apreciere a priotectiei anticorosive a izolatiei din benzi de polietilena sau polietilena extrudata la conducte de gaze naturale |
| The paper presents a standard proceedure for investigation of quality of polyethylene electrical insulation (either as polyethylene foil or as extruded polyethylene) used for buried high-pressure natural gas pipelines. A special mobile laboratory equipmen |
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| Reactiile derivatilor bezilhidrazinici cu compusi carbonilici |
| Reactions of 3,5-dialkyl-4-hydroxybenzylhydrazines (where alkyl groups are t-butyl and methyl), with phenyl alpha-chlorovinyl ketones yielded pyrazole derivatives having in the 3-position in the pyrazole group a phenyl substituent; the reactions of 2-hydr |
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| Sinteza directa a organohalogensilanilor. Perioada de inductie si mecanismul radicalic |
| At industrial scale organohalogensilanes can be prepared by direct synthesis. The synthesis involves the passage of organochloride (RX) gas over solid silicon, in a reaction catalysed by copper. The organochloride does not react readly with pure silicon, |
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| Studii privind dependenta de Ph a comportarii electrochimice a grafitului |
| The ion-exchange mechanisms for the explining of the electrochemical sensors (ES) functionality are excluded in any attempt of explaining the graphite electrode selectivity to the H+ or OH- ions. The mechanisms based on charge Transfer (CT)equilibria impo |
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Cercetari privind sinteza si activitatea biologica a sarurilor de 1,2,4-ditiazoliu-3,5-disubstituite
I. Obținerea percloratilor si fosfatilor de 1,2,4-ditiazoliu-3,5-disubstituiti
Irina Zarafu, Lucia Ivan, ION Baciu, Corina Toader |
| In the latest studies in this field a great attention was paid to the dithiazolium salts disubstituted in positions 3, 5 with phenyl radicals or susbstituted-phenyl <1-4>. The synthesis of these compounds has been patented because they are of applied in |
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Cinetica adsorbtiei ionului de zinc pe diferite biomase
de origine bacteriană si vegetala
Gheorghita Jinescu, Mihaela Stoica |
| In this paper there are presented researches regarding zinc adsorption on different biomasses, one of bacteria Pseudomonas Aeruginosa origin and two of vegetarian origin , the plants Pistia Stratiotes and Eichhornia Crassipes. The study was performed |
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Cinetica procesului de cristalizare a unor filme oxidice depuse prin metoda sol-gel
VIORICA Musat, CONSTANTIN Gheorghies, REGINA C.C. Monteiro, ELVIRA Fortunato, EUGEN Segal |
| The kinetics of crystallization of transparent and conductive high preferential c-axis oriented Al-doped ZnO thin films on Corning 1737 glass substrate from amorphous sol-gel precursor prepared using zinc acetate and aluminum chloride as cations source, 2 |
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Compusi coordinativi imobilizati pe suporturi celulozice
DUMITRU Ganju, DANUT Bontea, Doina Humelnicu, GHEORGHE Singurelu |
The results obtained by testing of catalytic activities of cellulose supported cobalt complexes afforded the obtaining of heterogenized homogenous catalysts. The obtained catalyst is efficient in the oxidation of organic substances.
Keywords: suppo |
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Depistarea falsurilor din cafea prin metode spectrale
Violeta Bogdanescu, Maria Giurginca, Nicoleta Iftimie, Romina Mihalache,
Aurelia Meghea |
| Coffee is one of the most easily adulterated food products, so its quality assurance requires accurate and facile method of analysis. In this respect, the present paper deals with analysis deals in UV-VIS-NIR spectroscopy domain of coffee synthetical mix |
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Depunerea filmelor subtiri de CdS prin tehnici electrochimice nestationare
Petru Ilea, Sorin Aurel Dorneanu, Ionel Catalin Popescu |
| CdS thin films were deposited on ITO electrodes from solutions containing CdSO4 and Na2S2O3 using two nonstationary electrochemical techniques: Repetitive Cyclic Voltammetry (RCV) and Periodic Pulse Electrodeposition (PPE), respectively. The CdS films obt |
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Determinarea
polarografica a metronidazolului
VALERICA DUMITRESCU, NINA DUMITRESCU, ALINA-MARIANA BALU
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| This paper presents a rapid, reproducible and simple d.c. polarographic method for the determination of metronidazole in pure form and in pharmaceutical tablets. To this respect, it was used an electrochemical cell comprising a dropping mercury electrode |
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Determinarea cobaltului in probe biologice si farmaceutice
Mariana Peltea, Anca-Iulia Stoica, George-Emil Baiulescu, Mihai Ionica |
| Microwave digestion coupled with graphite furnace atomic absorption spectrometry (GF-AAS) was utilised for cobalt determination from pharmaceutical and biological samples (hair, nails, blood and urine). Standard calibration curve for cobalt was constructe |
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Determinarea compresibilității soluțiilor binare din măsurători
ale vitezei ultrasunetelor
SERVILIA OANCEA1, DANA DOROHOI |
| Knowledge on the ultrasound propagation process through liquids is of the great interest for application in physics, chemistry, medicine, pharmacy and agriculture. That is the reason to study some experimental aspects linked to the behaviour of the ultra |
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Determinarea compresibilitatii solutiilor binare din masuratori ale vitezei ultrasunetelor
Lucian Copolovici, Simona Bungau, Felicia Dragan |
| The purpose of this study was to develop a low-cost, simple method with fast response, applicable to ASA determination in drugs. The kinetic method described here doesnt need any preliminary separation procedure or conversion of ASA to salicylic acid. Re |
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Determinarea pesticidelor organofosforoase cu un biosenzor potentiometric
pe baza de acetilcolinesteraza
MADALINA PETRUTA DONDOI, ANDREI FLORIN DANET, BOGDAN BUCUR,
MIHAELA CARMEN CHEREGI |
| A potentiometric biosensor based on acetylcholinesterase inhibition was developed for the determination of neurotoxic insecticides. The enzyme was mixed with bovine serum albumine (BSA) and immobilized by cross-linking with glutaraldehyde on a cellulose e |
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Electrooxidarea mediata a fenolului cu Co3+/Co2+
Influenta derivatului fenolic asupra curbelor de polarizare
CARMEN MONICA GONCEA |
| The paper presents the polarization curves for the mediated electrooxidation of phenol with Co3+/Co2+ mediator redox system at platinum anode in H2SO4 solution as supporting electrolyte. It was studied the influence of phenol concentration upon its oxidat |
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Enzime proteolitice în mediu organic
III. Influenta mediului organic asupra activitatii proteolitice a Alcalasei si Savinasei
GABRIELA PREDA, MONICA DRAGOMIRESCU, FRANCISC PETER, CAROL CSUNDERLIK,
ADRIAN CHIRIAC |
| Effects of water-miscible and water-immiscible organic solvents on the conformational stability of Alcalase and Savinase, industrial microbial serine-proteinases designed for the detergent industry, have been studied. The proteolytic activity decreased sl |
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Hidratarea nitrilului prin hidrataza nitrilica cu cobalt. Analiza DFT a mecanismului
Radu Silaghi-Dumitrescu |
Cobalt-containing nitrile hydratase (Co-NHase) catalyzes hydration of nitriles to amides. The Co-NHase active site features a pseudo octahedral cobalt center, coordinated by two deprotonated amides, one cysteinate, one sulfenate and one sulfinate (all p |
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Hidrazone ale 2-hidrazino-pirimidinei
ALINA ANDREI, VALENTIN BADEA, RODICA MREJERU, REMUS NUTIU |
| It was proved that the hydrazones of pyrimidines are active on Tubercle bacilli. Some hydrazones of 2-hydrazino-pyrimidine with aromatic aldehydes substituted at ring and with furfurol were synthesized. The products (at chromatographic purity) were chara |
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Indepartarea prin flotatie a Cd(II) din solutii apoase
Ligia STOICA, Anca RAZVAN |
| n recent years few non-conventional methods have been applied for water purification and recovery of some toxic or valuable metals from wastewaters. Cadmium, an environmental pollutant, is a highly toxic metal which accumulates in human body and causes re |
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Influenta presiunii si a compusilor cu azot asupra hidrodesulfurarii adanci a combustibililor Diesel
ANCA STERRY |
| A gas oil was submitted to deep hydrodesulfurization in a trickle bed reactor in order to study the influence of pressure and nitrogen compounds on the process. A commercial NiMo catalyst was employed. The total content of sulfur in gas oil was determin |
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Influenta unor parametri de operare asupra electroformarii aliajelor metalice de tip Ni-W
Liana Anicai, Aurora Petica, Sanda Visan |
| The influence of some plating parameters on Ni-W metallic alloys electroforming from an ammonium-citrate electrolyte has been investigated, in order to obtain flexible metallic foils. Thus, cathodic potentiodynamic polarization curves, cathodic current ef |
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Metoda cuplata de schimb ionic spectrometrie pentru specierea si determinarea continutului de crom din vinuri albe
LUMINITA VLADESCU, LUOANA PASCU |
| In this paper there is presented a ion exchange molecular absorption spectrometry in visible coupled method, which allows not only the determination of the concentration of chromium in wine but also the setting of the oxidation state this element in whi |
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Metode de identificare a azbestului in pulberi
Elena Ruse, Rodica Stanescu Dumitru, Ioana Ghica |
| The purpose of this study is to develop two methods in order to identify asbestos presence in raw materials or finished products, namely: Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy connected to an energy dispersive X-r |
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Modificarea spectrului de absorbtie in UV al sticlelor de disilicat de litiu cu grade diferite de cristalizare
Dorel Radu, Claudiu MAZILU, CAMELIA CAPATINA |
| Lately, the lithium disilicate glass (LS2) is back in the researchers attention because of its newly found practical application, mostly in the special glass-ceramic fields. Because of this, it is necessary to point out the influence of some parameters, |
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Noi derivati ai N-acetil-L-tirosinei
CARMEN TOPALA, ION BACIU, CODRUTA PARASCHIVESCU, CONSTANTIN DRAGHICI |
There were sintetizated and characterized two new derivatives of N-Acetyl-L-tyrosine ethyl ester with benzo-thiophene and cholesterol. The compound with cholesteryl moiety tends to have a liquid crystal behaviour.
Keywords: N-Acetyl-L-tyrosine ethyl |
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Obtinerea in stare cristalina a clorofilei din cetina de brad
(Abies alba) si de pin (Pinus sylvestris)
IOSIF Ianculov, RADU Palicica, Monica Butnariu, Delia Dumbrava, IOSIF Gergen |
| In this work it is considered the obtaining of chlorophyll in crystalline form, from fir needles (Abies alba) and from pine needles (Pinus sylvestris), quantitative colorimetric determination of chlorophyll, chromatographically separation of a chlorophy |
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Sinteza prin metoda sol-gel a sticlelor
în sistemul ZnO-TiO2- B2O3
Bogdan Alexandru Sava |
| The paper presents some studies made for the obtaining of vitreous materials in ternary system ZnO-TiO2-B2O3, by sol-gel route. This system is of great interest in the field of toxic wastes incorporation and for glassy coatings in optoelectronics. The i |
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Solubilitatea si temperatura de
vitrifiere a unor oligomeri ester-imidici
MINODORA LECA, TEODORA STAICU, MARIN MICUTZ |
| Solvents, global and partial solubility parameters and radii of the interaction spheres of ester-imide oligomers obtained starting from neopentylglycol and ethylene glycol as dihydroxy alcohols comonomers and two different molar ratios of dimethylterephta |
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Solubilitatea si temperatura de
vitrifiere a unor oligomeri ester-imidici
NICOLETA MATEI, SEMAGHIUL BIRGHILA, VIORICA POPESCU, SIMONA DOBRINAS,
ALINA SOCEANU, VASILE MAGEARU |
| Ascorbic acid (Vitamin C) is one of the most important water-soluble vitamins. It is needed for many physiological functions in human biology. Fresh fruits, vegetables and also synthetic tables supplement the ascorbic acid requirement of the body. However |
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Studii privind oxidarea fotochimica a izomerilor mononitrofenolului in sistem omogen
CRISTIANA COSMA, MARGARETA NICOLAU, AURELIA BALLO, INES NITOI, MIHAI STEFANESCU, JANA PETRE |
| This paper presents the results of experimental tests carried out in order to establish the influence of operating parameters (pH, molar ratio oxidant/pollutant, exposure time) on the degradation efficiency of nitrophenol isomers in reactions of photoly |
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Studiu cu privire la hidrocarburile aromatice
policiclice din bitum
Gheorghe BREBEANU, Floarea MANEA, CRISTINA DUSESCU |
In this paper there were analyzed two different bitumen simple. There were separated aromatics hydrocarbons which were analyzed by 1H-NMR and UV spectroscopy.
Keywords: bitumen, polycyclic aromatics hydrocarbons, UV, 1H-NMR.
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Studiul unor modificari conformationale ireversibile ale moleculei de ADN in prezenta unui chelat cu terbiu prin transfer rezonant de energie de fluorescenta
Mihaela Ilie, Viorel Fugaru, Daniela Baconi, Dan Balalau, Rica Boscencu |
| Fluorescence resonance energy transfer (FRET) techniques enable the study of structural macromolecular changes, due to the fact that they are short distance dipole - dipole coupling interactions between molecules or parts inside a macromolecule. Lanthanid |
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Tratamentul termic cu laser aplicat cordoanelor de sudura la oteluri inoxidabile pentru imbunatatirea rezistentei la coroziune
OCTAVIAN DONTU, STERGIOS GANATIOS, DANIEL BESNEA |
| The paper presents a study on the post weld heat treatment of a duplex stainless steel. Welded joint samples were surface treated using the same laser source adopted during welding in order to counterbalance the excess of ferrite formed in the welding |
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Utilizarea materialelor compozite pe baza de
magnetita pe suport zeolitic pentru depoluarea solurilor contaminate cu metale grele
RODICA PODE, VASILE PODE |
| Using of the natural zeolites, which have native well known properties of adsorption and ion exchange, constitutes an alternative for the conventional methods of the removal of heavy metal ions from contaminated soils and industrial sludge. After the rem |
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Bis (o-nitrofenil) carbonatul,
o alternativa valabila la fosgen in sinteza N,N diaril ureei
Monika Simon, Andreea Micle, Cristina Maria Turoczi, Valentin Badea, Carol Csunderlik
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| Symmetrical N,N-diaryl ureas were obtained from aryl amines in very good yields using bis(o-nitrophenyl)carbonate as the carbonylation reagent and 4-(dimethylamino)pyridine (DMAP) as the catalyst. The reactions were carried out in toluene at room temper |
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Caracterizarea si clasificarea oxizilor prin metode multivariate de analiza
OSSI HOROVITZ, COSTEL SARBU
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| A chemometric study has been conducted on a data set consisting of the 12 characteristics, mainly physical properties of the 103 oxides. Classical methods of multivariate analysis, namely Principal Component Analysis (PCA) and Cluster Analysis (CA) were a |
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Caracterizarea tiglelor din beton obținut
pe baza unor mase liante complexe
ION Neamtu, DUMITRU Becherescu, IOAN Lazau, Georgeta Voicu
|
| The study presents the results concerning the obtaining in industrial conditions of some concrete roof tiles in whose recipies the curent and the sand have been replaced by 5 - 15% fly ash.The textural characterization by mercury porosimetry and electron |
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Caracterizarea unor nanocompozite-purtatoare
de agenti biologic activi. II
EVELINE POPOVICI, Maria Alexandroaei, LUMINITA PANAITESCU
|
| The new applications of the nanocomposites are mainly oriented towards the formulation of systems for the controlled drugs delivery. The objective of the paper was the accumulation of data describing the manner in which the normal or the cancerous cells a |
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Comportamentul lipidelor simple într-un câmp electric
CARMEN TOPALA BENEDICT OPRESCU
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| By means of a mathematical model of the non-facilitated passive trans-membrane microtransport, the influence of the relaxation time of the various ions on the dynamics of cell parameters is demonstrated. Through the equating of the unfacilitated trans-mem |
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Comportarea la peroxidare a unor
amestecuri de acizi grasi nesaturati
ANCA DICU, RODICA SEGAL, MARIA GIURGINCA
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| The paper presents a simulation of in vitro oxidation processes, of some unsaturated fatty acids, using peroxidation and thermo-oxidative degradation methods. The characterization of the unsaturated fatty acids was done using IR and UV-VIS spectral techni |
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Degradarea prin coroziune a structurilor din beton armat
3. Contributii la studiul degradarii fizice a betonului armat
cauzata de curentii de dispersie
Iosif LINGVAY, MARIUS GABOR, CONSTANTIN-DORINEL VOINITCHI, CARMEN LINGVAY
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| In order to study the degradation mechanisms of concrete steel structures under the influence of stray currents. The study determined, on cylindrical samples, the evolution in time of volumic electrical resistance and breakage resistance, too. The deter |
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Determinarea spectofotometrica
a acetaminofenului si clorzoxazonei in comprimate prin tehnici multivariate de calibrare
Erdal Dinç, Abdil Ozdemir, Feyyaz Onur, Dumitru Baleanu, Halil Aksoy, Cem Yücesoy
|
| Three multivariate techniques, Inverse Least Squares (ILS), Principal Component Regression (PCR) and Partial Least Squares (PLS) were applied to the spectrophotometric determination of acetaminophen (AC) and chlorzoxazone (CL) in tablets without prior sep |
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Experimental Studies on the Thermal Conductivity
of an Oil Reservoir
TUDORA CRISTESCU
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| This work presents results of experimental studies on finding the values for the thermal conductivity of cores and laboratory prepared samples, composed of sand and clay mixtures, and saturated with oil and/or reservoir water. We are thus able to highlig |
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Extractia reactiva a uraniului din minereuri cu continut
ridicat de substante organice
Eugenia Panturu, Gheorghita Jinescu, Rozalia Radulescu, Gheorghe Filip
|
| The paper presents a study in which the process parameters influence on the lixiviation of uranium from ores having high content of organic substances, using sulfuric acid solutions is analyzed. The studied variables were: ore granulometry, oxidation pot |
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Functionalizarea fibrelor naturale cu noi agenti cu structura
1,3,5-s-triazinica in scopul compatibilizarii acestora cu sisteme cromogene neionice
VALENTIN RADITOIU, LUMINITA WAGNER, ALINA RADITOIU, VIORICA AMARIUTEI, CRISTIAN AURELIAN BOSCORNEA
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| Functionalization of natural supports was made by applying the reactive compounds as aqueous dispersions, in an aqueous medium by means of classical procedures exhaustion and impregnation, establishing the parameters that determine the reactive grafting o |
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Impactul radiologic al 14C
CRINA Bucur, MIRCEA Olteanu, CARMEN OLTEANU, MARGARIT Pavelescu
|
| Near surface disposal is considered a suitable option for the disposal of short-lived low and intermediate level waste (LILW) containing radionuclides which decay to insignificant radiation levels within a few decades or centuries. LILW containing limited |
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Legislatia naționala în domeniul substantelor si preparatelor chimice periculoase armonizată cu directivele specifice de mediu din acquis-ul comunitar
CAMELIA BASCEANU, LIANA ANICAI
|
| The actions performed within EU area in the field of chemical products regime belong to a complex ongoing process that has been launched several years ago. This process has in view the promotion of free transfer of chemical products on EU territory and pr |
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Modele de dependenta
intre pulberi si noxe cu impact asupra mediului
CARMEN LEANE NICOLESCU, GABRIEL GORGHIU, LAURA MONICA GORGHIU, GABRIELA BUSUIOC
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| The sustained development of the industry and agriculture that nowadays takes place are unavoidably accompanied by an important degree of the environment pollution. The pollution level can be decreased if the industrialization is adequately accompanied by |
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Noi compusi heterociclici din clasa 1,2,4-triazolilor si a
1,3,4-tiadiazolilor cu potentiala activitate biologica
STEFANIA-FELICIA BARBUCEANU, GABRIELA LAURA ALMAJAN, IOANA SARAMET, CONSTANTIN DRAGHICI
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| The synthesis and characterization of some thiosemicarbazides and heterocyclic compounds is described. In the reaction of 4-(4-X-benzensulphonyl)-benzoic acid hydrazide 1 with isothiocyanates 2, new N4-substituted-N1-<4-(4-X-benzensulphonyl)benzoyl>-thios |
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Obtinerea si caracterizarea fizico-chimica a compusilor de incluziune ai unui diuretic sulfonamidic cu b-ciclodextrina metilata
CODRUTA SOICA, ÁRPÁD GYÉRESI, ZOLTAN AIGNER, MIHALY KATA, CRISTINA DEHELEAN
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| Furosemide is a practically insoluble in water sulphonamidic diuretic, used for the treatment of edema and hypertension. Randomly-methylated-b-cyclodextrin(RAMEB) was used as a host molecule to improve its solubility in water, via inclusion complex format |
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Premiul Nobel pentru chimie în 2003 nu a fost atribuit chimistului român Gheorghe Benga,
cel care a descoperit primul aquaporinele
Miron Teodor Caproiu
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Reducerea monoxidului de azot prin recircularea gazelor în instalațiile de ardere
IONEL PÎSA
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| The paper analyses the nitrogen monoxide generation and suppressing during the combustion process of the powdered coal particle. The physical and mathematical model shows the nitrogen monoxide generation and the reducing of its concentration by the air s |
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Studiu cinetic asupra proceselor de fotostabilizare
si de degradare climatica
SILVIU Jipa, TRAIAN Zaharescu, RADU Setnescu, Tanta Setnescu, MUSTAFFA Kaci
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| The purpose of this paper is the evaluation of kinetic parameters for photolysis and weathering of materials. Isotactic polypropylene was selected for the substrate in the oxidative degradation processes. The change in the activation energy of different a |
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Studiu comparativ al uleiurilor esentiale de levantica obtinute prin hidrodistilare si extractie supercritica
MANUELA ZORCA, IOAN GĂINAR, DANIELA BALA
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| The supercritical CO2 extraction from lavender inflorescence is described by using a two-stage fractional separation. By comparison of the content in the oil extracted by supercritical fluid extraction (SFE) with those obtained by hydrodistillation (HD), |
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Studiul speciilor radicalice la radioliza in stare policristalina
a oxizilor de crom
MIHAI CONTINEANU, FLORICA ZALARU, IULIA CONTINEANU
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| The paper presents the results concerning the paramagnetic species formed by the g radiolysis at room temperature of polycrystalline samples of chromium oxides. The study has identified and characterized the following radical-ion species: , ,, containin |
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Transpozitii ompetitive VII <1>
Reactia 1,4-dibromo-dibenzo biciclo <2.2.2> octa-2,5,7-trienelor cu brom
Andreia Bruckner, Constantin Draghici, Petru Filip, Ilie G. Dinulescu, Irina Doana
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| The paper has identified the effects of the bromine bridge head atoms on the reactivity of the dibenzobicyclo<2.2.2>octatrienic system in the absence of the possibility of forming oxonium ions; the solvolytic reaction on compound 2 follows a route similar |
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| Analiza dispersa a tufului vulcanic clinoptilolitic si caracterizarea fractiunilor I. Analiza dispersa |
| The paper presents the way the disperse analysis of Mârșid-Ortelec (Romania) clinoptilolitic volcanic tuff has been carried out by screening and optical microscopy. Particles sizes ranged between 0,0475-0,715 mm. The number distribution curves have been |
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| Aspecte privind aditivarea catalizatorilor industriali de cracare catalitica |
| The effect of ZSM 5 and MCM 22 zeolites adding on the performances of industrial cracking catalyst was investigated. The experiments are carried out in a Microactivity Test (MAT) unit. The effect of additivation, without the influence of hydrogenated |
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| Caracterizarea microstructurala prin tehnici de difractie cu raze X a pulberii ceramice din BaTiO3 pentru termistori PTC |
| Ceramics based on BaTiO3 were synthesized via different routes by solid-state reactions. For these routes and different thermal treatments powders were obtained. These were investigated in the sense of microstructure characterization by XRD. The qualitati |
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| Complecsi cu grupe donoare mixte (OO) si (ONO). II. Sinteza si caracterizarea unor noi complecsi ai VO(IV), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) cu 1-fenil-3-metil-4-azo-(2'-carboxi-fenil)-pirazol-5-one, 1-(2'-benztiazolil)-3-metil-4-azo-(4'-nitro-fen |
| Some binuclear metal complexes of the type Na<(VO)(FMP)(aa)> and Cl where FMP = the ligand 1-phenyl-3-methyl-4-azo-(2-carboxy-phenyl)-pyrazol-5-one, BTNPh = the ligand 1-(2-benzthyazolyl)-3-methyl-4-azo-(4-nitro-p |
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| Dezactivarea catalizatorilor zeolitici prin depuneri de cox |
| The catalysts used in fluid catalytic cracking process are reversibly deactivated by coke deposition. The coke deposition and its effect on catalyst activity have been studied using the microactivity test laboratory scale reactor (MAT). The description o |
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| Evaluarea continutului de flavone al unui extract hidroalcoolic de Matricaria chamomilla prin cromatografie de lichide la presiune ridicata |
| Four major flavonoids (rutin, apigenin-glicozid, quercetin, apigenin) were determined in pharmaceutical product Romazulan containing a hydro-alcoholic extract of chamomilla, by acid hydrolysis and HPLC. HPLC was conducted on a LiChrosorb RP-18; dP-5Ęz |
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| Fenomene de suprafata in sisteme anorganice apoase cu continut de plastifiant |
| This paper presents information about the adsorption of some plasticizer admixtures like calcium lignosulphonate, melamine sulphonate formaldehyde and naphthalene sulphonate formaldehyde condensate in cement - water disperse systems, cement having differ |
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| Fixarea dinitrogenului in sisteme de hidroxizi ai unor metale tranzitionale |
| The optimum reaction conditions for N2H4 and NH3 formation by reducing the molecular nitrogen on mixed hydroxides of Cr(II) Mo(III) Ti(III); Cr(II) Mo(III) Mg(II) and Cr(II) Mo(III) Ti(III) Mg(II) have been determined. Although the catalytic |
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| Lactamoacetanilide |
| It was established that the reaction of chloroacetanilides and its N-substituted derivatives with lactames in alcalin medium leads by SN2 reaction at 2-N-lactamoacetanilides. Depending on chloroacetanilides structure, the reaction concurred by the format |
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| Materiale membranare. III. Particule magnetice si ferofluide |
| Ferrofluids consist of circa 100Ć diameter particles of a magnetic solid (usually magnetite, Fe3O4) colloidally suspended in a carrier fluid. Typical carrier fluids include hydrocarbons, water, fluorocarbons, esters, diesters, organometallics, polyphenyl |
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| Noi compusi din clasa 1,4-dihidropiridinelor cu potentiala actiune de blocanti ai canalelor de calciu |
| New 2,6-dimethyl-4-aryl/furan-2-yl-5-carbamoyl-1,4-dihydro-pyridines-3-carboxylic acid methyl ester (4) were obtained by Hantzsch reaction of 2-acetyl-3-aryl/furan-2-yl- acrylamides (3) with methyl 3-amino-crotonate. Acrylamides (3) were synthesized by co |
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| Polimeri organofosforici obtinuti prin policondensare catalizata cu transfer de faza vapori-lichid |
| New polyphosphates were synthesized by base promoted liquid-vapor interfacial polycondensation of various alkyl (aryl) phosphoric dichlorides (methylphosphoric dichloride (MPPD), cyclohexylphosphoric dichloride (CPPD) and phenylphosphoric dichloride (PPD) |
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| Productivitatea reactoarelor cu amestecare perfecta operate in regim continuu sau discontinuu |
| Most commercial liquid-phase chemical processes, such as hydrogenation, alkylation, sulfonation, halogenation and others are carried out in tank reactors, which can be operated either batchwise, or continuously. The choice between batch systems and the co |
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| Reducerea Cr(VI) folosind geluri polianilina-polistiren-divinil benzenice |
| The toxicity of hexavalent chromium was proven in the last years, and the concentration in residual waters deriving from a variety of applications like dye production, electroplating, tannery, is necessary to be bellow 0.1 mg/L. In this paper the reductio |
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Rolul de aditiv al tioureei in procesul de electrodepunere a straturilor subtiri nanocristaline de nichel si fier
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| The paper deals with the process of sulphur incorporation in thin films of nikel and iron obtained by electrolysis in baths containing thiourea (TH) as an additive. There were determined the sulphur and metal (Ni, Fe respectively) concentrations, the sulp |
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Forma bulelor in sisteme aer lichide viscoelastice
MIHAELA MIHAI, IRINA PINCOVSCHI |
This study represents an experimental investigation on the bubbles shape in aqueous solutions of polyacrylamide (PAM). PAM solutions were rheologically characterized in both simple shear and elongational flow. The work concentrations were chosen with re |
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Hidrodinamica stratului fluidizat trifazic in aparate
cu recirculare pneumatica externa
GHEORGHITA JINESCU, PAUL VASILESCU, OANA-CRISTINA PARVULESCU |
| The paper presents the experimental study regarding the hydrodynamic behavior of three-phase external-loop airlift apparatus, for its use in wastewater chemical, physical or biochemical treatment. It was realized an experimental installation at laboratory |
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Imbunatatirea performantelor debitmetrelor cu strat limita termic prin utilizarea sistemelor analog-numerice
DELIA PERJU, MARCEL SUTA |
| Automatic measurement and control of flows is a frequently encountered problem, especially in the technological activity. By automatic flow measurement and stabilisation, constant and well-defined operating conditions can be assured in plants, which may l |
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Influenta parametrilor procesului de hidrocracare asupra caracteristicilor uleiurilor
GHEORGHE BREBEANU |
| In this paper it has been analyzed and compared some oil cuts before and after hydrocracking. The 1H-NMR method emphasized the structural changes such as: aromatic carbon concentration decreasing, sulphur content decreasing, saturate carbon content increa |
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Investigarea termica a procesului de hidratare a cimenturilor de Portland topite
GHEORGHE FLUERAS, STEFANIA STOLERIU, ION TEOREANU |
| By the melting of raw mix, Portland cements with superior properties can be obtained, depending on chemical composition and used cooling treatment. This method of melting allows the intensification of formation reaction of mineralogical components. The Po |
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Metode probabilistice si de testare in evaluarea riscului
CALIN I. ANGHEL |
| The paper presents sampling and probabilistic approximation procedures for the risk assessment of technological installation under operating conditions. It is reported like one probabilistic measure for risk levels of polluting emissions of a gaseous rele |
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Modelarea procesului de dizolvare a sarii geme din zacamantul Ocnele Mari
ROMULUS DIMA, FLORIAN ZAMFIRESCU, CRISTIANA LUMINITA GIJIU, VASILICA DIMA |
| Solution mining of rock salt is a geologically safe process for the production of saturated brine, but in Ocnele Mari-field 2 a brine-field gigantic cavern was resulted from uncontrolled production to the extent that the safety pillars between the cavern |
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Monitorizarea substantelor organice importante biologic si din punct de vedere al mediului pe electrozi cu pasta de carbon
Jiűí Zima, Jiűí Barek, Alexandr Muck
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In this article, the attention will be paid to characterization of carbon pastes, to their use in the analysis of organic substances and to the current trends in the field. The examples of the use of CPE in analytical chemistry from the last two year pe |
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Noi tendinte in identificarea numerica a cineticii (bio)chimice
GHEORGHE MARIA |
| Kinetic modelling of complex (bio)chemical systems on a mechanistic basis requires extensive experimental investigations to reflect the process characteristics under variate reaction conditions. The experimental effort must be coupled with a computational |
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Procesul de colmatare in timpul filtrarii tangentiale si in strat adanc. 1. Modelarea si simularea operarii unei instalatii
TANASE DOBRE, JOSE SANCHEZ MARCANO, OCTAVIAN FLOAREA |
| Tangential and deep bed filtration are examples of solid-liquid processes separation, where surface or deep bed clogging is one of the major problems for the continuous operation of industrial units. A mathematical model based on the decomposition and par |
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Proiectarea si reglarea reactoarelor chimice in sisteme cu recirculare
ALEXANDRU C. DIMIAN, COSTIN S. BALDEA, ANTON KISS |
| To comply with modern requirements, as flexibility in production, high efficiency of raw materials, reduced inventories and down-to-zero waste, both design and control of reactors in recycle systems should be integrated at an early design stage. The pape |
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Reglarea optima a duratei in reactoarele discontinue prin algoritmi genetici
OCTAVIAN RADUCAN, VASILE LAVRIC, ALEXANDRU WOINAROSCHY |
| The problem of determining the optimal control of systems with free end time is challenging. When the system is highly nonlinear, the global optimum solution may be difficult to obtain, even if the final time is given, but when this is free, another addit |
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Studiul coloanelor de extractie cu rotor
cilindric - dimensiunea picaturilor
ION TRANDAFIR, RADU Z. TUDOSE |
| The size of the drops was determined using the techniques of photographic analysis in three extraction columns with cylindrical rotor and with different constructive parameters in the water-acetone-carbon tetrachloride system. The values of the mean diam |
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Transfer termic prin convectie naturala de la suprafete extinse cu aripioare elicoidale in forma de L
GHEORGHE SOARE |
| The purpose of this paper is the experimental measurement of the thermal transfer coefficient by natural convection from an extended pipe with L-shaped helical paddles to air. An experimental laboratory plant was built and the thermal transfer coefficient |
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Utilizarea fluidelor magnetice in procese de separare
Zeno Gropsian, Romulus Minea, Eugen Brinzei, Andra Tamas |
| In this paper it is shown the possibility of magnetic fluids utilization for magnetogravimetrical separation of granules mixtures with different densities as a result of fluid apparent density change under the influence of external applied magnetic field. |
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ADRIANA SAMIDE1*, ION BIBICU2, BOGDAN TUTUNARU1, MIRCEA PREDA
Studiul suprafeței oțelului-carbon corodat în ape industriale
care conțin NH3/NH4Cl utilizând spectrometria Mössbauer |
| The film of corrosion products was formed by immersing low-carbon steel in dilluted ammonia media (10-3 M NH3 and 5.10-3 M NH4Cl, pH = 6,5), was investigated by electrochemical measurements and Mossbauer spectroscopy.The results of Mössbauer spectroscopy |
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ANA-MARIA POPESCU, VIRGIL CONSTANTIN
Potentialul de descompunere in saruri topite I.Al2O3 in topiturile criolitice cu anod inert pe baza de SnO2 |
| The theory and experimental determination methods for the decomposition potential in molten salts are presented. The decomposition potential of Al2O3 in cryolite melts inert anodes based on SnO2 was determined by the method of I-U curves. The Ed values o |
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AUREL PUI, ALEXANDRU CASCAVAL
Sinteza si caracterizarea liganzilor tetrahalogeno alfa-metil Salen si a complecsilor lor cu Ni(II)
|
| A series of Salen type bis Schiff bases tetrahalogeno a-methyl substituted have been synthesized and characterized. They have in 3,3,5,5 positions the Cl, Br, I, or Cl and Br atoms. The nickel (II) forms with such ligands complexes with square planar o |
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AURELIA PISCUREANU, DANA VARASTEANU, VIORICA PARVULESCU
Influenta selectivitatii catalizatorului asupra compozitiei etoximerilor rezultati din reactia de aditie a oxidului de etilena la alcoolii superiori |
| It has been studied the influence of selective heterogeneous Ca + Al alcoxide catalysts and Mg, Y +Sr,Y phosphates catalysts to the kinetics and range distribution type of ethoxymers obtained in addition reaction of ethylene oxide to fatty alcohols |
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CAMELIA PAPUC, CRISTINA DIACONESCU, CARMEN NEGOITA
Activitatea fosfolipazica a proteinelor extracelulare biosintetizate din Malassezia Pachydermatis
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| Malassezia pachydermatis strain used was isolated from the skin of a dog with seborrhea extern otitis. Phospholipasic activity of extracellular proteins of Malassezia pachydermatis was investigated. According to the results of thin-layer chromatography, M |
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CLAUDIA MARIA SIMONESCU, VALENTIN SERBAN TEODORESCU, LMINITA PATRON,MARIA GIURGINCA, CAMELIA CAPATANA
Metoda neconventionala de obtinere a nanocristalitelor
de sulfuri de cupru |
| In this article the obtaining and characterization of a mixture of copper sulfide (CuS, Cu9S8, CuS2) is presented. The characterization was made by IR Spectroscopy, X-ray Powder Diffraction (XRD) and Transmission Electron Microscopy (TEM). The sulfide mix |
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CONSTANTA SAVA, ALFA XENIA LUPEA, GABRIELA STANCIU, MIRABELA PADURE
Studiu privind doua noi vopsele azostilbenice si diastereoizomerii acestora |
| The paper describes the chromatografy studies of 2 new azostilbene dyes. The results of the HPLC analysis is focused on the identification of the chemical species that are separated. The correlation between elemental analysis, IR and NMR spectra and photo |
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CONSTANTIN CIUGUREANU, DOINA E. MURARESCU
Noi derivati de benzofuran si benzimidazol diheterociclici |
| The synthesis of a new benzofuran and benzimidazol- substituted 1,2,4-triazole, 1,3,4- thiadiazole, 1,3,4- oxadiazole and indole is described. The synthesis of benzofuran derivatives was accomplished starting from 4-chloro-2-hydroxy benzoic acid me |
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CORNELIA NICHITA
Estimarea activitatii antioxidante si evidentierea efectului sinergetic determinat de principiile active existente in extractele
de Carduui mariani fructus |
| The paper investigates by UV-VIS-NIR-FTIR, chemiluminescence and TLC (thin layer chromatography) the chemical and spectral characteristics of the Carduui mariani fructus. Corroboration of the experimental data emphasized the structural complexity, antio |
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COSTICA STRATULA, MIHAELA PETRE, OCTAVIA GHEORGHE
Tehnologie pentru eliminarea acidului clorhidric din produsul
de reactie de la fabricarea acetoclorului |
| The paper presents an experimental study of HCL extraction with water from the mixtures: HCL-ethanol-benzene-water, HCL-ethanol-xilene-water, HCL-ethanol acetochlor-benzene-water. Influence of ethanol by repartition coefficients of HCL between aqueous pha |
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DAMIAN AXENTE, CRISTINA MARCU, ECATERINA STELA DRAGAN, ECATERINA AVRAM
Adsorbtia U(VI) din solutii de HCl de pe
rasini schimbatoare de anioni |
| The adsorption capacity of different commercial anion exchange resins: Amberlite-IRA 900 Cl; Amberjet 4400 Cl; Dowex 1-X8; Dowex - Marathon and of CEPU-5 M, especially synthesized for uranium isotope exchange, for uranyl chlorocomplexes from HCl solution, |
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DORINA MATEI, ANCA BORCEA, VASILE MATEI
Oxizi micsti perovskitici cu actiune oxidanta
asupra unor hidrocarburi |
| The aim of this paper is to establish the catalytic potential of three perovskitic systems obtained from polimetallic complexes combinations. These systems proved to be efficient in the field of hydrocarbon oxidation toluene in this case. Two directions |
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GABRIELA VASILE, LILIANA CRUCERU, JANA PETRE, ION VASILE
Investigatii analitice complexe privind biodisponibilitatea metalelor grele din sedimente |
| This paper proposes a chemical single extraction method for exchangeable forms of heavy metals applied to specific types of sediments from Danube Delta (Uzlina, Murighiol). The total content of heavy metals (Cd, Cu, Cr, Mn, Pb, Zn) determined in the sedi |
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GHEORGHE SEMENESCU, AURELIAN GEORGESCU
Fenomenologia interfetei solid-lichid-electrolit
I. Informatii cantitative din zgomotul de fond in inregistrarile
electrochimice curent-timp |
| By the logarithmic variation of the amplitude of the charge oscillating currents with the solution concentration, the background noise in the current-time recordings becomes a source of quantitative information in the case of simple electrolytes.These cha |
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ION SANDU, AURELIAN GULEA, IRINA CRINA ANCA SANDU, CONSTANTIN LUCA,
IOAN GABRIEL SANDU
Studii privind sistemul de reactie Pd2+ 2,6 diaminotoluen |
| This paper aims to present novel data of reaction system Pd2+ 2,6 diaminotoluene, which was studied by pH-metric, chemical, thermal, IR and RMN methods, when is confirmed the presence of two addend molecules in the first coordination sphere, as monochlo |
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Maria Pleniceanu, MARIAN Isvoranu* CEZAR Spînu
Studiu spectrofotometric si determinarea Cu(II) cu N-<2-tienilmetiliden>-aminopropan |
| The spectrophotometric study of the binary system Cu(II)N-<2-thienylmethylidene>-aminopropane (L=Schiff base derived from thiophene-2-carbaldehyde with aminopropane) was achieved and a spectrophotometric method of determining Cu(II) with this reagent is |
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MARIANA ILIESCU, CORNELIU PODINA, CRISTIAN JUJEA, VALENTIN TUDOSE
Studiul speciatiei chimice a uraniului (VI) in solutii apoase in microconcentratii in prezenta unor agenti complexanti |
| Uranium (VI) chemical speciation in ultradiluted aqueous solution in the presence of two anionic ligands, F- and SO42-, was studied. Overall stability constants, for all complex species formed by uranyl ions with these two ligands, were determined. Total |
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MONICA BUTNARIU, MIRCEA GOIAN, IOSIF IANCULOV, IOSIF GERGEN, PETRU NEGREA
Studiu privind influenta ionului Co2+ asupra dezvoltarii si acumularii in plantele de soia a altor elemente chimice
(fier, magneziu, calciu, potasiu si fosfor) |
| Soy bean (Glicine max) was tested as a santinel species from cobalt, because of the remarkable plant selectivity at this hard metal. This paper evaluates the contribution of soil qualities and the acumulation of chemical elements in soy beans plants b |
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NICOLETA G. HADARUGA, DANIEL I. HADARUGA, ALFA XENIA LUPEA, VIRGIL PAUNESCU, CALIN TATU
Nanoparticule bioactive. 7. Ulei esential din plante din familiile Apiaceae si Pinaceae/sistem supra molecular beta-ciclodextrina
|
| The paper presents the nanoencapsulation of the essential oils from Apiaceae (caraway, coriander, fennel, dill) and Pinaceae (fir, spruce, turpentine) family plants in â-cyclodextrin, using the ethanol-water solution method. Essential oil/â-cyclodextrin c |
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PETRE SAVESCU, MIRCEA PREDA
Cercetari privind variatia potentialului redox
in cazul laptelui de soia obtinut din apa deionizata |
The traditional methods that are used, soaking in water and grinding, will produce good quality soymilk but will have the beany taste. Following the termical treatments, some proteins, aminoacids, vitamins are destroyed. For this reason, the technolo |
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STEFAN PERISANU, MIRCEA D.BANCIU, IULIA CONTINEANU, ANA NEACSU, LOREDANA CHIVU
Studiu DSC privind unii alcooli dibenzocicloheptanici
|
| The latent heats of melting of the following alcohols have been measured: 5H-10,11-dihydrodibenzocycloheptane-5-ol (alcohol 1); 6-hydroxymethyl-5,6-dihydro-7H-dibenzocycloheptane (alcohol 3); 5-hydroxymethyl-5,6-dihydro-7H-dibenzocyclohepta |
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TANASE DOBRE, JOSE SANCHEZ MARCANO, IAVORSCHI GUSTAV,
Modelare aunei unitati de filtrare in care loc un proces de colmatare. II. Modelarea stocastica a functiei de colmatare |
| The tangential filtration (micro or ultrafiltration) and the deep bed filtration are examples of the solid liquid separation processes where the surface or deep clogging of the filter can occur and influence dramatically the process efficiency. For each |
|
VALENTIN RADITOIU, LUMINITA WAGNER, ALINA RADITOIU, CRISTIAN AURELIAN BOSCORNEA,
CORNELIU TARABASANU-MIHAILA
Noi pigmeni termosenzitivi cu structura
benzimidazolonazoica |
| The article presents experimental data regarding some benzimidazolone-azo dyes synthesized by coupling diazonium salt of 5-amino-1,3-dihydro-2H-benzimidazole-2-one with different coupling components. Reaction products were purified and characterized by m |
|
VALERIU ROBERT BADESCU, CONSTANTIN LUCA
Echilibre competitive in seria de criptati ai cationilor Ag+, Pb2+, Ba2+, Sr2+, Ca2+, Li+ cu criptandul hexaoxa-diazabiciclohexacosan (criptand 2.2.2) |
| The competition between the formation equilibria of the Ag(2.2.2)+ and M(2.2.2)n+ (Mn+=Pb2+, Ba2+, Sr2+, Ca2+ , Li+) cryptates was theoretically studied with the help of ac <2.2.2> diagrams and experimentally by competitive potentiometry, using an Ag/A |
|
Chimia învechirii vinului. Consideratii economice asupra
perioadei de depozitare a vinului
VICTOR MANOLE, MIRCEA GHEORGHITA, VIOREL-PUIU PAUN
|
| In this paper a quantitative analysis of wine storage period is presented. The efficiency model developed by the authors is based on the functions V(t) (the net value of wine at moment t) and ANV(t) (the Actualized Net Value of the profit). In this way, ( |
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Actiunea speciilor reactive ale oxigenului asupra materialului biologic (MB)
CRISTIANA DIACONESCU, CAMELIA PAPUC
|
| The action of reactive species oxygen (H2O2 , O2· and HO· ) on membranal lipidic peroxidation from bull biological material (BM) was studied. Cryopreservation at -196oC produces in time the inactivation of the defensive enzymes from (biological material |
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Ameliorarea limitelor de detectie ale biosenzorilor bazati pe acetilcolinesteraza prin utilizarea unei enzime extrasa din
Drosophila Melanogaster
Madalina Petruta BUCUR, Andrei Florin DANET, Jean-Louis MARTY
|
| This paper presents the improvement of the limits of detection of acetylcholinesterase (AChE) based biosensors using the higher sensitivity of the AChE from Drosophila melanogaster (AChE-Dm) for organophosphorous insecticides determination in comparison w |
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Analiza comparativa
a continutului de polifenoli din muguri foliari si frunze de mesteacan prin HPLC-UV-MS
CRISTINA ADRIANA DEHELEAN, LAURIAN VLASE, CAMELIA PEEV, DIANA ANTAL, CODRUȚA ȘOICA
|
| The presence of eighteen polyphenolic compounds was simultaneously assessed through a HPLC method with UV and mass spectrometry detection in the buds and leaves of birch tree. Investigated substances were: gentisic acid, p-coumaric acid, caffeic acid, fer |
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Analiza instrumentala folosita pentru
autentificarea picturilor vechi
IRINA CRINA ANCA SANDU, SUSANNA BRACCI, ION SANDU
|
| The paper deals with the study of materials and technique for two icons of XIX-th century through instrumental analyses (optical and scanning electron microscopy, FT-IR and microRaman spectroscopy staining tests) in order to identify the authentication el |
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Capacitatea sarurilor de magneziu de a complexa polifenolii
din produsele vegetale
Mihaela Mirela Bratu, Sepp Porta, Ticuta Negreanu-Pîrjol, Florentina Roncea, Horatiu Miresan1
|
| Polyphenols are plant secondary metabolites commonly found in herbs and fruits, especially berries, as colour and flavouring agents and are an integral part of human diet. They exhibit a wide variety of beneficial biological activities, including antivira |
|
Dependenta coroziunii unor materiale metalice
de aciditatea mediului corosiv
Ovidiu Neagoe, Mihai V. Popa
|
| The paper presents a comparative study on the corrosion of OL-37 carbon steel, of W4571 allied steel, of brass and of Monel-type alloy, in synthetic media at pH=1.2 and 6.4, respectively. Gravimetric tests have been performed , in static regime, at 250C. |
|
Efectul tratamentelor termice
asupra comportarii la coroziune fisuranta sub tensiune a imbinarilor sudate
Marius Gabriel PETRESCU, Ion NAE, Eugen Victor LAUDACESCU, Ramadan Mansour ELLAFI
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| Stress Corrosion Cracking (SSC) is considered to be connected to the fragility through hydrogen phenomenon. The tests were made on samples of steel SA 516. On these, a circular weld seam was deposed. The samples were subdued to different thermal treatment |
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Extracte originale din plante utilizate in produse
dermatocosmetice cu actiune fotoprotectoare
I. Evaluarea activitatii antioxidante
Elena Cremenescu, Maria Giurginca, Aurelia Meghea
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| The inherent (chronological) and extrinsic (thermo and photooxidative) ageing are mainly responsible for the dysfunctions of the protecting and regenerating mechanisms of the skin. Therefore, there is a constant need of new products, preferably natural |
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Indepărtarea benzenului din fractia hexanica
prin hidrogenare pe catalizatori de tip Ni/ Al2O3 SiO2
TRAIAN JUGANARU, CONSTANTIN IONESCU, DORIN BOMBOS
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| Removal of benzene and unsaturated hydrocarbons from C6 fraction was achieved through catalytic hydrogenation. Two catalysts containing Ni supported on two different types of aluminosilicates were used. The experiments were performed in a continuous fixed |
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Inhibarea coroziunii oțelului carbon in mediu de HCl utilizând
poli (O-2-hidroxietil) amidon
ADRIANA PATRU, MIHAELA FLOROIU, BOGDAN TUTUNARU, MIRCEA PREDA
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| The inhibiting effect of poliy(O-2-hydroxyethyl) starch (PETA) has been studied regarding the corrosion of carbon steel in hydrochloric acid solution at room temperature. The effect of the inhibitor has been demonstrated using weight loss and electrochemi |
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Modelarea procesului de contaminare a produselor petroliere in cazul transportului succesiv al acestora prin conducte
SORIN NEACSU, CORNEL TRIFAN, MIHAI ALBULESCU, EMIL CALOTA
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| The paper presents a numerical pattern of the contamination process of two petroleum products that are sequencially transported through same pipeline. The pattern allows the calculation of concentration variation for the first product in the second one al |
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Noi benzamide substituite cu potentiala actiune antipsihotica
Corina Ilie, Rodica Guță, Doina Nănău-Andreescu, Diana Nuță, Miron Teodor Căproiu
|
| In this paper, we present experimental data regarding the synthesis of eight new N-(trifluoromethylphenyl)-N-(2-dialkylaminoethyl) benzamides (7a - h) by reaction of N-(3-trifluoromethyl-phenyl)-N,N-dialkyl-ethan-1,2-diamines (4a-b) with benzoyl chlori |
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Noi derivati de pirolo<1,2-b>piridazina prin
reactii de cicloaditie 1,3-dipolara
FLOREA DUMITRAȘCU, CONSTANTIN DRAGHICI, ANDREI ALBULESCU, DAN DUMITRESCU
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| The reactions of 2-phenacylpyridazinium bromides 3 with ethyl propiolate and triethylamine in methylene chloride at room temperature gave regioselectively 7-aroyl-5-carboethoxy-pyrrolo<1,2-b>pyridazines 8. The hydrolysis of ethyl 7-(4-bromobenzoyl)-pyrro |
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O sinteza convenabila si
eficienta a anticoagulantului (±)DX 9065a
Yann Davion, Gérald Guillaumet Michel Lafosse, Brigitte Lesur, Jean-Yves Mérour1*Adriana Finaru,
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| Factor Xa (FXa) is a serine protease which plays a pivotal role in the coagulation cascade. The inhibition of FXa has received a great interest as a potential target for the development of new antithrombotic drugs. Herein we describe a highly convenient a |
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Obtinerea si separarea 18F din H218O. Obtinerea imaginilor TEP
CATALINA CAMPEANU, PETRU MIHAI RACOLTA, NEGOIȚA NICOLAE, Ion Mihalcea
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| The nuclear reaction 18O (d, 2n) 18F and the separation of 18F from the irradiated samples have been studied. For this reaction liquid H218O samples were irradiated with deuterons beam in the stainless steel cells cooled with water. The formed positron em |
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Reactia o, m si p-clorurilor de toluil
cu nitrobenzen activat ultrasonic si termic III. Reactia p-clorurii de toluil cu nitrobenzen
Florica CHIVU, Liliana LUNGU, Petru FILIP, Carmen STAVARACHE, Mircea VÎNĂTORU
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| The reaction of nitrobenzene with p-toluyl chloride, initially subjected to ultrasounds and then heated for 40 h at 210oC was investigated. This reaction also took place by an electron transfer mechanism. One important difference comparing with the previo |
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Reactiile 1H-3-metil-4-etoxicarbonil-5-benzilidenhidrazino-pirazol
in medii neapoase in conditii de electroliza a celulelor nedivizate si divizate
LIVIU Costea, VASILE Bercean, VALENTIN Badea, ION Țăranu, ADRIAN Chiriac
|
| The redox characteristics of 1H-3-methyl-4-ethoxycarbonyl-5-benzylidenehydrazino-pyrazole (2a) have been investigated in nonaqueous dimethylsulfoxide at a platinum electrode. The voltammetric investigation of the above compound in nonaqueous dimethylsulfo |
|
Relatii intre stabilitatea electrochimica si
biocompatibilitatea aliajului Co-Cr-Mo
Elena Aionicesei, Daniela Ionita, Florin Miculescu, Anisoara Cimpan, Ioana Demetrescu,
|
| This study focuses on the connection between biocompatibility and corrosion resistance for a Co-Cr-Mo alloy used for biomedical applications. Electrochemical, surface analysis and in vitro tests were used to estimate the stability of the alloy in simulate |
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Separarea Ni(II) din solutii apoase diluate prin flotatie cu
colector alfa benzoinoximă
Ligia STOICA, Olimpia Micu, Ioana Lacatusu, Vasile Iancu
|
| The research on flotation separation of Ni(II) from diluted aqueous systems, as insoluble chelate complexes is presented in this paper. The behavior of aryloxime, a-benzoinoxime (a-BO), as chelating reagent (collector) has been studied in Ni(II) ion flota |
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Sinteza si caracterizarea unor coloranti cosmetici
NICOLETA IOICA SLAVILA, MARIANA PESCARU, ION SEBE
|
| The article presents the experimental data concerning the synthesis of some disazoic dyes which are the result of the condensation of monoazoic dyes obtained in their turn by the diazotation of amines: para-nitroaniline, N,N-dietil-aminoaniline, 3-nitroan |
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Sisteme supramoleculare gazda-musafir (porfirine incapsulate in macroneti) cu aplicatii biomedicale
Rodica-Mariana ION, DragoȘ-Viorel BREZOI, Ion UDREA
|
| The interaction of an anionic porphyrin meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) with a polymeric sorbant resin called Macronet in aqueous solution, is investigated in this paper by spectral techniques: UV-Vis, IR. The polymric resins used in this pa |
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Studii privind bioremedierea in-situ pe baza de inocul bacterian
pentru soluri poluate cu produse petroliere
Roxana Luca, CONSTANTIN Ana, Liana Anicai
|
| The paper presents results of testing in-situ bioremediation using bacterian inocul for a 500 m2 experimental surface of a polluted soil with oil products. We have demonstrated that a commercial concentrate containing a mixture of bacteria is useful for |
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Studiul aplicabilitatii unor metode HPLC pentru determinarea simultana a SAM si SAH
Camelia BÎRSAN, Simona Carmen LITESCU, Ioana VASILESCU, Sandra EREMIA, Gabriel Lucian RADU
|
| Due to the implication of S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) on essential metabolic pathways of hormones, nucleic acids, several drug types, etc. and also due to the importance of the value of SAM/SAH ratio in incipient diagnosis |
|
Studiul cinetic al reactiei de descompunere
termică a amoniacului
DANIELA DIRTU, LUCIA ODOCHIAN
|
| The paper develops a kinetic study on the reaction of NH3 thermal decomposition at 700 0C, 750 0C and 800 0C, developed under dynamic conditions, in an installation equipped with a quartz reactor. Dosing of the reactant NH3 was made with a specific chemic |
|
Utilizarea ICP-MS
pentru determinarea urmelor de elemente din probele marine
ELISABETA CHIRILA, TURCHEAN PETISLEAM, IONELA CARAZEANU POPOVICI, ZOE CARADIMA
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| Original results concerning Ag, Co, Cr and Ni determination in marine biotope (sediment and water) and biocenosis (algae, crustaceans and fish) collected in 2003, 2004, 2005 and 2006 from the Romanian Black seacoast ecosystem are presented. The solid samp |
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| Activarea oxigenului molecular. Implicarea unor combinatii coordinative ale ionului Co(II) in acest fenomen |
| A number of complexes with imidazole and glycine as ligands were prepared. The reaction with molecular oxygen was found to be reversible in aqueous solution only. Solid glycine complex was studied by the magnetic and ESR methods. A monomer of formula |
|
| Aspecte farmacodinamice ale unor coloranti cationici derivati din sisteme compact condensate |
| These tests were applied starting from the data gathered from the specific literature, where a lot of information about the compact condensed compounds and cationic dyes and their pharmacological actions has been found. Several tests were performed to det |
|
| Biosenzor potentiometric pentru determinarea glucozei bazat pe electrod redox de SnO2 |
| The paper deals with the manufacture of a potentiometric biosensor for glucose based on a SnO2 redox electrode. The enzyme membrane is cellulose acetate with glucose oxidase and peroxidase physically immobilized. The optimum conditions for obtaining the S |
|
| Coloranti antrachinonici pentru fibre poliamidice |
| The synthesis of some disperse antraquinonic dyes derivated from 1-amino-4-bromo-antraquinonsulphonic acid (bromamine acid) were described. New disperse dyes are obtained by condensing bromamine acid with N-acetil-p-phenylene-diamine, methoxylation or des |
|
| Combinatii complexe ale Cu(II) capabile sa fixeze oxigenul molecular |
| Six recipes for obtaining some monomeric and dimeric complexes of Cu(II) with imidazole and aminoacids have been elaborated. By elemental analysis and IR spectrometry evidence has been brought that these complexes are capable of reversibly fixing the mole |
|
| Corelatii pentru transferul de masa al oxigenului in bioreactoarele cu amestecare mecanica. Lichide de fermentatie simulate |
| The oxygen mass transfer represents the most important parameter implied on the design and operation of mixing-sparging equipment of the bioreactors. It can be described and analyzed by means of mass transfer coefficient, kla. The kla values are affected |
|
| Efectul concentratiei hidrogenului in deformatia tangentiala la avarie a tuburilor de Zircaloy-4 cu pereti subtiri |
| The Zy-4 tubes occlude hydrogen during manufacture and during operational service in the presence of the high-temperature water used to extract heat from the nuclear reactor. The hydrogen precipitates in zirconium alloys as platelets of hydride, which can |
|
| Electrooxidarea mediata a hidrochinonei cu Ce4+/3+. Efectul concentratiei derivatului fenolic asupra curbelor de polarizare |
| The paper presents the polarization curves for the mediated electrochemical oxidation of hydroquinone with Ce4+/3+ redox system at platinum anode using H2SO4. as supporting electrolyte. It was studied the effect of the hydroquinone concentration upon |
|
| Evaluarea prin chemiluminescenta a unor modificari provocate de stresul oxidativ indus prin expunere la camp magnetic asupra sangelui uman |
| In this paper it was studied the effect of healthy human serum exposure to 50 Hz frequency magnetic field by chemiluminescence method. The magnetic field exposure was carried out with two Helmholtz coils. The serum was exposed for 1, 2, 4 and 5 h to 0,596 |
|
| Influenta continutului in grupe cian a fazelor stationare siliconice asupra comportarii gaz cromatografice a n-alchil esterilor acidului fosforic |
| Three homologous series of n-alkyl esters of phosphoric acid were studied to evidence the influence of the cyano groups content of the silicone stationary phases on their gas chromatography behaviour. Two silicone stationary phases with different content |
|
| Investigatii asupra degradarii oxidative a piritei cu apa oxigenata in mediu fosfat |
| The leaching of pyrite by hydrogen peroxide was investigated in concentrate phosphate medium at 30 oC temperature. This medium was chosen in order to avoid the oxidative action of ferric iron. At pH values equal to or lower than 2.78 in the presence of ph |
|
| Procese fizico-chimice care apar in fluidele combustibile tratate in camp magnetic |
The paper presents a magnetic system conceived for the treatment of combustible fluids, the physical and chemical processes involved there, as well as and the resulting effects, respectively the increase of thermal output and the diminution of the pollu |
|
| Simularea reactorului catalitic monolit de postcombustie pentru reactia de oxidare a monoxidului de carbon |
| The steady-state simulation of the monolith catalytic converter uses a lumped 1D pseudo heterogeneous model, which accounts for mass and heat transfer between the bulk of the gas phase and the stationary gaseous boundary at catalyst surface. The kinetic m |
|
| Sinteza unor noi derivati ai 2,2-dihidroxi-1,1-binaftilului si caracterizarea lor spectrala |
| Starting from 2,2'-dihydroxy-1,1'-bi-naphthyl by condensation with 2-(bromomethyl)-benzonitrile, ethyl 2-(bromomethyl)-benzoate and phtalide were obtained 2,2'-bis(2-ciano-benzyloxy)- , 2,2'-bis(2-ethoxycarbonyl-benzyloxy)- and respectively 2,2'-bis(2-ca |
|
| Studiu privind determinarea spectrometrica a acceleratorului de vulcanizare Vulcacit M, utilizat in amestecuri de cauciuc |
| A simple method for the spectrometric estimation of 2-mercaptobenzotiazole (Vulcacit M) is described. The method allows the determination of this rubber accelerator without its prior separation from other polymer additives. By measuring the absorbance a |
|
| Un nou cicloaduct primar al fenacilidelor de ftalaziniu cu DMAD |
| The 2-(4-chlorophenacyl)phthalazinium bromide (7) and dimethyl acetylenedicarboxylate (DMAD) gave, in the presence of triethylamine, the primary cycloadduct cis-9. The reaction was performed at 00C in methylene chloride using strictly equimolar ratio betw |
|
| Unele aspecte privind influenta umiditatii gazelor naturale asupra preciziei masurarii comerciale a debitelor |
| The paper presents some aspects concerning thermodynamic equilibrium for the system natural gases water for ideal and nonideal conditions. It proposes a new calculus method for natural gases humidity like a function of pressure and temperature, based on |
|
1H-3-metil-4-etoxicarbonil-5-aroilhidrazino-pirazoli
intermediari in sinteza
1H-3-aril-6-metil-7-etoxicarbonil-pirazolo<5,1-c><1,2,4>triazolilor
VASILE-NICOLAE BERCEAN, VALENTIN BADEA, OANA CARJILA, CAROL CSUNDERLIK |
| 1H-3-methyl-4-ethoxycarbonyl-5-benzoyl-hydrazino-pyrazole 4a, obtained through the action of the benzoyl chloride on the hydrochloride of the 1H-3-methyl-4-ethoxycarbonyl-5-hydrazino-pyrazole 2 in the presence of organic bases in aprotic organic solvent, |
|
Amidarea necatalizata a anhidridelor din polimeri
Roxana Badulescu, Ion Bolocan, Dan Sorin Vasilescu |
| Several aromatic amines have been tested in reaction with alternating copolymer styrene - maleic anhydride (SAM). Succinic anhydride (AS) has been used as model compound. The dependence between the amine basicity, or steric effects, on the obtained conver |
|
Anioni complecsi ai Pt(IV) in chimia analitica.
Determinarea ranitidinei
ION GANESCU, GEORGE BRATULESCU, ANCA GANESCU, AURORA REISS, ALIN BARBU |
| Some new gravimetric, oxidimetric and spectrometric methods for the determination of ranitidine as (Ranitidine . H)2 have been described. The experimental data statistic processing proves that these methods are accurate enough and not affected b |
|
Argumente pentru o industrie petrochimica in Romania
LUCIAN MOTIU
|
|
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Comportamentul lipidelor in camp electric
3. Amestecuri de acid colic, glicerol, lipide derivate
BENEDICT OPRESCU, CARMEN TOPALA |
| In this paper it was described the unfacilitated passive diffusion electric model of some mixtures of cholic acid, glycerol and lipid derivatives in order to explain the nature of relaxation time. Relaxation time responds by equivalent electric capacity |
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Comportarea la coroziune si pasivizarea otelului inoxidabil 18Cr-10Ni in solutii 1N de acid formic, acetic, oxalic si citric
Gabriela Elena BADEA, Anca Cojocaru, Teodora BADEA |
| Anodic and cathodic polarisation studies for 18Cr-10 Ni stainless steel in 1N organic acid solutions of formic, acetic, oxalic and citric have been made by the potentiostatic method. The corrosion stability of 18-10Ni stainless steel decreases in the foll |
|
Conditionarea in ciment portland a deseurilor
radioactive uleioase
NICOLETA DENEANU, MIRELA DULAMA, ELENA BABOESCU, ION TEOREANU |
| Cementation is a widely used method to immobilize radioactive wastes generated during functioning of nuclear plants. The results of research have shown that the oily radioactive wastes resulting during the normal service of Nuclear plant from Cernavodă-Ro |
|
Dependenta liniara a puterii calorifice superioare
si a continutului de volatile de continutul de cenusa pentru probele anhidre ale lignitului de Vladimir
ION VIASU-BOLOCAN, HOREA NASCU, ELENA MARIA PICA, GAVRIL NIAC, OSSI HOROVITZ, ALEXANDRU POPESCU |
| Linear relationships between higher heating value (HHV) (14 samples) and volatile matter content (VM) (15 samples) vs. ash content (A) of Vladimir lignite (moisture free) were investigated. Both straight lines have high correlation coefficients (-0,998 fo |
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Determinarea continutului in microelemente al catorva vinuri romanesti prin spectrometrie de absorbtie atomica
MARIA SERDARU, LUOANA PASCU, LUMINITA VLADESCU |
| In this paper there are discussed some results concerning the determination, by atomic absorbtion spectrometry, of heavy metals contents - Cu, Cd, Zn, cr, Mn, Fe, Co, Ni and Pb - in white and red wines produced from 8 grapes varieties of Dragasani vineya |
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Determinarea hidrocarburilor aromatice policiclice (HAP) si pesticide organoclorurate in rosii si piper verde
SIMONA DOBRINAS, SEMAGHIUL BIRGHILA, NICOLETA MATEI, VALENTINA COATU |
| A method is proposed for the determination of 15 polycyclic aromatic hydrocarbons (PAHs) and 9 organochlorine pesticides (OCPs) in tomato and green pepper based on their extraction with hexane and subsequent separation by gas chromatography with mass spec |
|
Determinarea piridoxinei din produse farmaceutice
prin doua metode cinetice
Simona Bungau, Lucian Copolovici, Ioan Baldea, Vasilica Merca |
| This paper is a study based on kinetic determinations of pyridoxine by using its redox reaction with potassium permanganate. The stoichiometry of reaction has been determined using spectrophotometrical titration. In the absence of Mn(II) ions, the kinetic |
|
Determinarea unor conditii redox la obtinerea
unei sticle silicocalcosodice
Camelia Capatina |
| Nowadays there are estimation concerns of redox conditions in obtaining the glass and their expression through the so-called redox number of the glass. When redox conditions are modified, the iron present in the glass is sensitive, changing the proportio |
|
Efectul anionului CO32- asupra coroziunii otelului carbon in solutie de clorura de amoniu
ADRIANA SAMIDE, PAUL CHIRITA, OLIMPIA RUSU, MIRCEA PREDA |
| The influence of CO32- anion on the corrosion of carbon steel in NH4Cl solution has been studied using several technique such as weight loss, Tafel polarisation and liniar polarisation. Measurements of values of polarisation resistence (Rp) have also been |
|
Enzime proteolitice in mediu organic. I. Selectarea enzimei si optimizarea mediului apos-organic
pentru sinteze de aminoacizi optic activi prin rezolutia
cinetica a esterilor lor
GABRIELA PREDA, FRANCISC PETER, BENIAMIN PINTEA, CAROL CSUNDERLIK,
AD |
| he aim of this paper is to present own preliminary results in the enzymatic kinetic resolution of amino acid methyl esters to obtain L-amino acids starting from DL-amino acids and using proteolytic enzymes in organic media. The DL-amino acids were esterif |
|
Estimarea efectului antioxidant al extractelor din plante prin chemiluminescenta
Aurelia Meghea, Nicoleta Iftimie, Maria Giurginca |
| The active species extracted from shrub and medicinal plants have been characterized by spectral (UV VIS - FTIR) and chemiluminescence techniques, in order to establish the correlation between their composition and antioxidant capacity. Antioxidant acti |
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Fractia de goluri medie globala a sistemelor aer lichide viscoelastice in coloane cu barbotare
Mihaela Mihai, Irina Pincovschi |
| The overall gas hold-up is an important hydrodynamic parameter for bubble columns. This study provides new insights into the phenomena at the interface of gas-liquid systems influencing the gas hold-up in viscoelastic polyacrilamide (PAM) solutions. The i |
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In memoriam - prof. dr. doc. Valeriu Vantu, fondatorul scolii romanesti de petrochimie
Gh. IVAN |
|
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Industria de ciment din Romania prezent si viitor
Doru Puscasu |
|
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Influenta campurilor externe asupra acidului arachidonic
Elena Slavnicu1, Mihaela Ghelmez (Dumitru)1, VIOREL PUIU Păun1*, Dan Slavnicu2 |
| In this paper it is studied the electric field influence upon some arachidonic acid mixtures with cholesterol. It is also presented the dependence of the electric field intensity through the sample as a function of the applied voltage, with or without th |
|
Membrane compozite pentru procesul de osmoza inversa
CAROL LEHR, LILIANA PASARE, OANA NITA, GEORGETA POPESCU |
| Interfacial polimerisation technique leads to the obtaining of composite membranes with optimal characteristics for reverse osmosis, the active and selective thin and dense layer being deposited on a microporous resistant support. The use of a support mad |
|
Modelarea curgerii gravitationale in regim laminar a filmelor de lichid pe site inclinate
Gheorghe Soare |
This paper presents the results of a theoretical and experimental study concerning the liquids flow in film, on inclined metallic sieves. It was built an experimental installation allowing the measurement of liquid film thickness at various flows a |
|
Nivelele ebergetice de rotatie si regulile de selectie de simetrie pentru rotatorul asimetric rigid H2S
Dana-Ortansa Dorohoi, George Amarandei, Cristina Stan |
| Considering H2S as an asymmetric rigid top in ground electronic quantum state with non-vibrating atoms, it is estimated the pure rotational energy levels. On the basis of symmetry selection rules for an asymmetric top with its two-fold axis lying on the |
|
Noi analogi de inhibitori selectivi ai COX-2 din clasa pirazolil-benzensulfonamidelor substituite
MARIA CROITORU, LUCIA PINTILIE, CONSTANTIN TANASE, ALEXANDRINA STUPARU, CATALINA CIOATE, FLOREA COCU, MIRON TEODOR CAPROIU, CONSTANTIN DRAGHICI |
| The paper presents the synthesis of COX-2 selective inhibitor Celecoxib analogues, obtained by N-alkylation of the nitrogen sulfonamide atom. The new synthesized compounds were purified by crystallization and characterized by m.p., elemental analysi |
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Obtinerea si caracterizarea dispersiilor nanocristaline de NaCl pentru medii terapeutice de tip salin
III. Evaluarea fiabilitatii aparatului salin
ION SANDU, CONSTANTIN PASCU, IOAN GABRIEL SANDU, GABRIELA CIOBANU,
Andrei-Victor Sandu, OCTAVIAN CIO |
| The work presents the reliability of a Romanian manufactured apparatus, Salin (S.C. Tehno Bionic S.R.L. Buzău), based on structural and functional features, used-up for therapeutic environments and for creating the treatment effect of halochambers and for |
|
Senzori de temperatura pe baza de filme de PBS nanostructurate
Violeta Popescu |
| Nanostructured PbS films were obtained by chemical bath deposition (CBD) in bath containing: lead salt, thiourea, alkali and surfactant. As a function of the layer number, the films have thickness between 50-200 nm. Optical glass slides K 515 9 mm x 6 m |
|
Sinergia chimie economie mediu pentru dezvoltarea durabila
CRISTIAN SILVIU BANACU, CONSTANTIN RANEA |
|
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Sinteza si caracterizarea derivatilor unor coloranti cationici din sistemul compact condensat 2-aminotiazolo<4,5-f>indazol
Cristiana Rădulescu1*, CORNELIU Tarabasanu-Mihaila, ANA MARIA Hossu, IONICA Ionita |
| This paper presents the synthesis of some cationic dyes derivatives of the heterocycle system with thiazolic ring, 2-aminothiazolo<4,5-f>indazole, studied by UV-VIS, NMR and infrared analysis confirming the proposed structures. The results obtained by dy |
|
Stabilitatea fierului slab aliat in sistemul
etilenglicol - acid acetic la diverse concentratii ale apei
Daniel Mircea SUTIMAN |
| The behaviour of three types of steel with a variable carbon content (from 0.2 to 0.4%) was studied in medium of ethyleneglycol 5% acetic acid with water concentration between 1- 5%. The weight losses were measured; also, the polarisation curves were pl |
|
Studiul cineticii desulfurarii uscate a gazelor reziduale cu oxid de calciu. II. Modelarea matematica si identificarea parametrilor cinetici
S. DRAGAN, I. SIMINICEANU |
| In order to correlate the kinetic experimental data presented in the forst section of this work, a grain-micrograin model has been used. This model considers the particle (grain) of radius Ro made up of a number of micrograins of radius ro. The kinetic co |
|
Un model pentru estimarea starii de incarcare a acumulatorului plumb-acid sulfuric
IRINA NITA, DAN MANDALOPOL, OLGA IULIAN |
| Models for lead-acid battery state of charge estimation during operation in renewable energy systems are presented. In order to increase the accuracy of the state of charge estimation during long time operation under dynamic conditions specific for stand- |
|
Utilizarea unor suporturi polimere care contin coloranti imobilizati pentru separarea ionilor de Cu(II) si Zn(II)
din solutii apoase
SIMONA HORA, GEORGETA SIMU, RAMONA RAD, ADRIANA POPA, MIHAI MILOS |
| In this study it was investigated a new sorbent system, Azoic Direct Dye-attached poly(S-DVB functionalized) microbeads, for the removal of heavy metal ions from aqueous solutions. The specific sorbents were characterized by using UV-VIS spectroscopy. Ads |
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Peroxidarea lipdelor >n muschi de pastrav (Salmo trutta fario)
CAMELIA PAPUC, CARMEN PETCU, ELENA SLAVNICU
|
| Fresh trout (Salmo trutta fario) was cryoconservated for different period of time. For fresh and cryoconservated muscle, levels of conjugated dienes and malonaldehyde were investigated. Profile of phospholipids was also investigated. Levels for conjugate |
|
Acizi aminofosfonici si derivati
VIII. Sinteze clasice si moderne de noi a-aminofosfonati
Nicolae Onita, Alfa Xenia Lupea, Ioana SiSu, Monica Elena Lungu1, Elisabeta Ivan
|
| The synthesis of a-aminophosphonic acids and their derivatives has an increasing interest because of their biological activity and structural analogy to a-amino acids (mimetics of a-amino acids), especially in cases when a-carbon atom is a chiral center. |
|
Biomateriale tip hidrogel pe baza de polizaharide cu aplicatiile biomedicale
Eugenia Teodor, Alexandrina Rugina, Gabriel Lucian Radu
|
| Over the past 30 years greater attention has been focused on development of controlled and sustained drug delivery systems. The goal in designing these systems is to reduce the frequency of dosing or to increase effectiveness of the drug by localization a |
|
Calculul optimal al compozitiei oxidice a clincherelor
ZENO GHIZDAVET, DOREL RADU
|
| In thermal balance calculations for clinkering installations, the heat of reaction claims for the most of the overall heat consumption. Nowadays, as a result of years of innovative constructive-type improvements, it was attained a limit of energy savings |
|
CRISTINA GHITULICA, GIAN MARCO BORETTO, ECATERINA ANDRONESCU
Procesarea si caracterizarea spumelor ceRAMICE COMPOZITE ARMATE CU DIOXID DE ZIRCONIU
|
| Alumina / zirconia and mullite / zirconia composite ceramic foams were prepared using the polymeric sponge method. The parameters of preparation were optimized and the ceramic foams were characterized in what microstructure, density, compressive strengt |
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Efectul temperaturii si concentratiei acidului lactic asupra stabilitatii otelului tip 316L
Rodica Popescu, Ioana Demetrescu
|
| Cyclic voltammetry at various temperatures was used to examine the behavior of 316L stainless steel, in lactic acid in order to evaluate corrosion as an aspect of biocompatibility <1>. Kinetic corrosion parameters, including activation energy, were discus |
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Feromagnetismul molecular al compusilor organici pirolizati
Silviu Jipa1, Wilhelm Kappel, Traian Zaharescu, Radu Setnescu1, Calin Oros
|
| Organic magnets were obtained by pyrolysis of polyacrylonitrile and acrylonitrile-divinyl benzene copolymer at three temperatures (400, 600 and 8000C) for 2 or 4 h in inert atmosphere. They were characterized by magnetic measurements (magnetic moment vs f |
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Identificarea oxitocinei in extract pineal folosind HPLC cuplata cu spectrometrie de masa a 'timpului de zbor'
Liliana Badiu, Hans Vilhardt, Aurelia Meghea
|
| Modern proteomic tools involve mass spectrometry coupled with HPLC separation methods. Neurohypophiseal nonapeptides were disputed to be present in the pineal gland, exerting various modulator functions. Even using the high performance chromatographic tec |
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Incalzirea globala-modificarile climei-gaze cu efect de sera
Gabriela-Maria Tirlea |
|
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MARIA GEORGESCU, CONSTANTIN DORINEL VOINITCHI, GEORGETA VOICU
Procesele de hidratare si hidrocompusi in sistemele liante de zgura activata alcalin |
| The hydration of alkali activated binders is a very complex process, which supposes the simultaneous/successive reaction of different mineralogical compounds from the slag with the alkali solution. The present paper brings information regarding the hydrat |
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Mihaela Ilie, Daniela Coltuc, Dan Balalau, Rica Boscencu, Daniela Luiza Baconi
Analiza spectrelor de difuzie a fluorescentei pentru anumiti complecsi chelati cu nucleoproteine: Abordare chemometrica
|
| Chemometrics gained in the last two decades a well defined place among the methods used to assess the quality of different materials, mainly in the cosmetics, pharmaceutical and food industry. These methods replace the classic, univariate way of measurin |
|
Noi compusi din clasa 1,2,4-triazolilor si
1,3,4-tiadiazolilor obtinuti prin ciclizarea unor aciltiosemicarbazide
STEFANIA BARBUCEANU, LAURA ALMAJAN1, IOANA SARAMET, BOGDAN DRAGHICI
|
| This paper presents synthesis of 1,2,4-triazoles and 1,3,4-thiadiazoles by intramolecular cyclization of 1,4-disubstituted thiosemicarbazides with arilsulfonilbenzoyl and i-propyl group, in alkaline and acidic media. The new synthesised compounds were cha |
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Obtinerea de S- si O-glicozide în conditiile CTI
Ioana Sisu, Vasile Bercean, Mircea Niculescu, Nicolae Dinca, Eugen Sisu
|
| The synthesis of S- and O-glycosides of aliphatic and aromatic thiols, halohidrines and mercaptotriazoles, which in PTC conditions exhibit thiol-thione echilibrium, are presented. The yields of the glycosilation reactions in PTC conditions (47-78%) are co |
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Potentialul de descompunere în saruri topite
II. Al2O3 în topiturile criolitice cu anozi de carbune
Ana-Maria Popescu, Virgil Constantin
|
The decomposition potential of Al2O3 at various temperatures in cryolite melts using carbon anodes was determined by the method of I-U curves. The obtained Ed = 1.3-1.5V values are in good agreement with literature experimental values.
Keywords: decompos |
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Separari de faza Influenta substantelor tensioactive asupra separarii la echilibru în faze distincte pentru diverse sisteme si trasarea diagramelor de faza
DACIANA COSTINA ANDRADA Stefan, DEMETRA Simion, GEORGETA Popescu, BUJOR Albu, AURELIA Piscureanu |
| The study of the phase separations for systems containing surfactants is extremely important from both scientific and technologic point of view. Ternary systems consisting of solubilisate / emulsifier / water were studied, where the emulsifier is represe |
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Sinterizarea hidroxiapatitei cu adaos de oxid de magneziu
Ion Teoreanu, Maria Preda, Alina Melinescu
|
| The sintering of hydroxyapatite was studied in presence of 1.05 2.11% magnesium oxide content, considered potentially bonded as Ca3Mg3P4O16. The obtained samples were thermally treated at 1100-1250 °C. For samples with low magnesium oxide content was no |
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Sinteza 2-hidroxi-5-nonilbenzaldoximei si a acidului N-(2-hidroxi-5-nonilbenzil) aspartic, potentiali colectori în flotatia ionica
Florea Cocu, Ligia Stoica, Ioana Lacatusu
|
| This paper presents the optimum conditions for the synthesis of new collector reagents for ion flotation starting from accessible reagents (alkylated p-nonylphenol). 2-hydroxy-5-nonylbenzaldoxime and N-(2-hydroxy-5-nonylbenzyl) aspartic acid were syntheti |
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Sinteza si caracterizarea unor noi agenti cu structura
1,3,5-s-triazinica pentru functionalizarea fibrelor naturale celulozice si proteice în scopul compatibilizarii acestora cu
sisteme cromogene neionice
VALENTIN RADITOIU, LUMINITA WAGNER, ALINA |
| The article presents experimental data regarding some heterocyclic compounds as chemical modifying agents for natural fibers, synthesized by bicondensation of cyanuric chloride with different organic amines like as : aniline, á-naphtylamine, sulfuric acid |
|
TURCHEAN PETISLEAM, ELISABETA CHIRILA, ZOE CARADIMA
Determinarea Cd, Cu, Fe Mn si Zn in probe din mediul marin prin ICP-MS
|
| The paper presents new results concerning Cd, Cu, Fe, Mn, Pb and Zn determination in marine biotope (sediment and water) and biocenosis (algae, crustaceans and fish) collected in 2003 and 2004 from the Romanian Black seacoast southern part, between Mangal |
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Utilizarea legumelor ca biomonitori in poluarea mediului
Ioan Gogoasa, Constantin Marutoiu, Iosif Gergen, Maria Rada, Cristian Tigae
|
| The paper presents a series of vegetables (spinach,lettuce, parsley-leaves ) which were used as indicators in determining the degree of pollution with heavy metals. We determined the heavy metals in vegetables in a polluted and an unpolluted area in Banat |
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A Case Study on the Electrical Conductivity and pH Modelling Function of Different Ionic Concentrations in the Water Precipitations
GABRIEL GORGHIU, LAURA MONICA GORGHIU, GABRIELA BUSUIOC
|
| It is well-known that the electrical conductivity is strongly influenced by the presence of different ions (anions and cations) also by their mobility in the environment. At the same time, this parameter is dependent on the ionic concentration, temperatur |
|
Actiunea antimicrobiana a unor noi compusi cu structura de
5H-dibenzocicloheptena
LAURA-ILEANA SOCEA, GABRIEL SARAMET, BOGDAN SOCEA, CONSTANTIN DRAGHICI
|
| A new thiosemicarbazide 2 bearing 5H-dibenzocycloheptenyl-methyl group at N1 and 4-fluorophenyl substituents at N4 was synthesized using classical procedures. The thiosemicarbazide 2 undergo different cyclization reactions to give five membered heter |
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Analiza calitativa a chrisinei din mugurii foliari utilizati in fitoterapie, prin CSS si HPLC-MS
CAMELIA PEEV, LAURIAN VLASE, CRISTINA DEHELEAN1, CODRUTA SOICA, MIRCEA TAMAS
|
| Chrisine is a natural compound synthesised in plants and evidenced especially in foliar buds and other vegetal products, but in significant quantities in beekeeping ones. The aim of this study was to observe the presence of this compound in 13 types of fo |
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Analiza flavonoidelor din Hydrangea paniculata si Ziziphus jujuba prin flash cromatografie si cromatografie de lichide de înaltA performanta (HPLC)
SVETLANA CACIG, FLORINA RADU, ALFA XENIA LUPEA, IRINA IFRIM
|
| In this study we presented the results obtained as an application of flash cromatography as a purification method for alcoholic extracts of Hydrangea paniculata and Ziziphus jujuba, coupled with high performance liquid chromatography (HPLC) for quantiti |
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Biosolubilizarea ionilor de uranil din minereuri uranifere
de catre plante acvatice
Alexandru Cecal, Rodica Calmoi, Nicoleta Melniciuc - Puica
|
Universitatea Al. I. Cuza Iași, Facultatea de Chimie, B-dul Carol I, Nr. 11, 700506, Iași, București
This paper investigated the bioleaching of uranyl ions from uranium ores, in aqueous medium by hydrophyte plants: Lemna minor, Azolla caroliniana a |
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Calibrarea retelei neurale artificiale pentru
determinarea simultana a Ca si Mg din apele naturale
A.Hakan Aktas, Meltem Sener, Güzide Pekcan Ertoku, Süleyman Demirel
|
| Artificial Neural Network (ANN) method was successfully applied to the multi-component analysis of the binary containing different substances in natural waters. In this application ANN method is suitable for the quantitative resolution of the mixtures of |
|
Caracterizarea fizico-chimica a 2-aminobenzotiazolilor
6-substituiti cuCH3, OCH3, Cl, NO2
Maria-Marcela Târlea, CornelIU Tarabasanu-Mihaila, George Marton, Nicoleta Grigoriu, Roxana Nita
|
| The study describes the main physical chemical characteristics of 2-benzothiazolamines-6-substituted with CH3 , OCH3 , Cl, NO2 , synthetized by Kaufman reaction, adapted for each product. Purification was made by recristalling from ethyl alcohol p.a |
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Cercetari privind activitatea mirozinazei
in extractele apoase de hrean
DANIELA MUCETE, FLORINA RADU, IONEL JIANU, PAUL PIRSAN
|
| This paper describes a simple and rapid method of determination of sinigrin-myrosinase complex from Armoracia rusticana (sample 1: cut horseradish and sample 2:homogenisated horseradish) The activity of Myrosinase was measured in different conditions of t |
|
Combinatii complexe cu derivati de tip N-benzoiltiouree
ai Pt(II) si Pd(II)
Alia Deleanu, Monica Ilis, Tudor Rosu, Viorel Cîrcu
|
| This paper describes the synthesis of two new N-benzoyl-N-aryl-thiourea derivatives, as well as their Pt(II) and Pd(II) complexes. Their structures have been assigned based on FT-IR and 1H-NMR spectroscopy and their thermal behaviour has been investigate |
|
Comportarea electrochimica in solutie Ringer a unui aliaj
de implant pe baza de titan, tratat termic
DOINA RADUCANU, Ecaterina Vasilescu, PAULA DROB, ION CINCA, CORA VASILESCU
|
| In this paper, the electrochemical behaviour of the implant, thermally treated Ti-6Al-4V ELI alloy in Ringer solution is studied; five thermal and plastic deformation treatments were applied. The behaviour of the thermally treated alloys were studied in c |
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Degradarea prin coroziune a structurilor din beton armat
5. Contributii la studiul coroziunii elementelor de susținere din beton armat din instalatiile de transport si distributie a energiei electrice
Iosif LINGVAY, Carmen LINGVAY, Călin HOMAN, Ov |
| We have analyzed the degradation by corrosion of concrete steel sustaining elements involved in the systems for energy transportation and distribution. From the analysis of several steps of mechanism it is concluded that their degradation is caused by t |
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Determinarea concentratiei metalelor grele poluante ale aerului si solului prin metoda spectrometriei de emisie atomica cu plasma cuplata inductiv
Mariana Dobra, Vasile Viman
|
| Mining activities such as ore extraction, ore enrichment into useful components, and processing these into concentrates, in the area of Baia Mare, contribute to the continuous polluting of the air and soil with heavy metals, bearing negative influences on |
|
Determinarea experimentala a randamentului efectiv pentru un nou tip de pompa volumica rotativa
NICOLAE BARAN, GHEORGHE BARANA, DANIEL BESNEA
|
| The paper presents the sketch and the functional principle of a new type of rotating volumetric pump. A functional model of the pump was built and mounted on a test stand. Actual efficiency of the pump was established as result of the performed measuremen |
|
Determinarea HMF si variatia concentratiei in timp
in functie de tratamentul termic
IULIANA BRATU, CECILIA GEORGESCU
|
| The aim of the study is to follow the influences of thermal treatment on the hydroxymetylfurfural (HMF) content of honey samples, on time. Analyzed honey comes from the melifere zone of the Romanian Subcarpathians . This content was supervised in time a |
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Efectul termostabilizator al unor derivati benzoeteri coroana în polietilenă de joasa densitate
Marius BUMBAC, Constantin LUCA, Silviu JIPA, Traian ZAHARESCU, Bogdan SERBAN
|
| This paper presents the stabilization activity of some crown ethers: benzo-15-crown-5, benzo-18-crown-6, dibenzo-18-crown-6, 4-amino-benzo-15-crown-5 in thermal oxidation processes of low density polyethylene. Kinetic parameters of thermal oxidation of l |
|
Evaluarea fragilitatii topiturilor vitrogene silicatice în raport
cu echilibrele de faza
DOREL RADU, MARIA RADU
|
| The dependency of some properties of glass forming melts to temperature could give information regarding the structure of those vitreous systems. Thus, the way in which the viscosity of glass forming melts vary with temperature leads to classify them in |
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Evaluarea stabilitatii unor implanturi pe baza de titan in diferite fluide biologice simulate
Mihaela MINDROIU, Faik Oktar, Ioana Demetrescu, Teddy Tite1
|
| This paper studied the corrosion behavior of Ti/TiO2/P2O5-CaO-SiO2/physiological fluid interface by electrochemical methods. The bioactivity and surface structural changes of bioglass, 45S5 containing 45% SiO2, 6% P2O5, 24.5% CaO and 24.5% Na2O all in wei |
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Influenta continutului de apa în solventii N-metilpirolidona si dimetilformamida asupra solubilitatii propilenei si propanului
Mihaela Petre, Costica Stratula
|
| The paper presents an experimental study of propylene and propane solubility in two solvents: dimethylformamide (DMF) and n-methylpirolidone (NMP) with various water contents. Solubility data have been obtained for the binary system propylene-propane in s |
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Metoda de dezagregare a unor minereuri uranifere
MARIAN Raileanu
Universitatea Alexandru Ioan Cuza Iasi, Facultatea de Chimie, Bdul. Carol I, Nr. 11, 700506, Iasi, Romania
|
| The purpose of this work is the study of a method for the unification of the following two succesive phases in uranium ore processing: the samples reduction and acid leaching. Moreover, an optimisation of acid mixture for this leaching is wanted. This op |
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Noi tiosemicarbazide obtinute prin aditia nucleofila a hidrazidei acidului 4-(4-X-fenilsulfonil)-benzoic la izotiocianatul de 2-metoxifenil si ciclizarea acestora la heterociclii din clasa 1,2,4-triazolilor si
1,3,4-tiadiazolilor
STEFANIA-FELICIA |
| The paper presents synthesis and spectral data for nine new compounds bearing diphenylsulfone moiety. 4-(4-X-phenylsulfonyl)-benzoic acid hydrazides 6 were reacted with 2-methoxyphenyl isothiocyanate to give the N1-<4-(4-X-phenylsulfonyl)benzoyl>-N4-(2-me |
|
Protectia mediului prin integrarea unui incinerator de deseuri
la un cazan de abur care functioneaza cu carbune
Ioana IONEL, Paul Dan OPRISA STANESCU1, Claudiu GRUESCU, Alexandru SAVU, Corneliu UNGUREANU
|
| The paper offers an analysis of the potential coupling of a municipal waste incinerator in Romania, to an existing coal fired steam boiler. Considering the retention of heavy metals as well as HCl from the waste flue gases before entering the boiler, the |
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Recuperarea Vanadiumului din reziduurile de cocs prin utilizarea
unor liganzi chelati sol-gel modificati ca noi sorbenti II. Cinetica adsorbtiei pentru indepartarea vanadiului
din cocs din solutiile apose pe liganzi sol-gel modificati
Lygia Ulpia |
| Recovery of vanadium from ash resulting from petroleum coke combustion was studied in a two-step method involving a hydrometallurgical ash treatment and a chelation step with sol-gel modified ligands. Sol-gels containing iminodiacetic groups, imidazole, |
|
Sinteza fosforamidatilor pornind de la amine fluorurate
Mihaela Florina Petric, Lavinia Macarie, Aurelia Pascariu, Gheorghe Ilia
|
| Fluorinated amines were phosphorilated in biphase systems using two methods: the liquid-liquid system using halogenated solvents or liquid-solid system using inorganic bases. The best results were obtained in liquid-solid system in the presence of potassi |
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Sinteza si actiunea genotoxica a cinci
derivati benzotiazolici 2-aril-substituiti
Hülya ZEYTINOGLU, Asiye MERYC, Berrin TÜYLÜ, Emel ERGENE
|
| Five 2-aryl-substituted-benzothiazoles were synthesized from o-amino-thiophenol and their structural assignments were made by 1H-NMR. Mutagenicity of derivatives was tested by Salmonella microsome assay using TA98 and TA100. 2-m-tolil-benzothiazole and 2- |
|
Sinteza, caracterizarea si activitatea biologica a complexului
Au (III) cu etanditioamida
Sabina Zagan, Ioan Berdan, Ticuta Negreanu-Pirjol, Lucica Barbes
|
| The Au(III) complex compounds properties are used in the treatment of tumour growth inhibition. Within this framework an Au(III) coordinated complex with ethanedithioamide in 1 : 2 molar ratio has been synthesized. The complex was prepared by treating KAu |
|
Studii magnetice,
optice si bilogice asupra complexelor de cupru (II) cu 2-benzotiazolil hidrazone. I
MIRELA CALINESCU, EMILIA ION, ANA EMANDI, RODICA GEORGESCU, TICUTA NEGREANU-PIRJOL
|
| Three Cu(II) complex compounds with 4-dimethylaminobenzaldehyde-2-benzothiazolyl hydrazone (HL) have been prepared and characterized by elemental and thermogravimetrical analysis, infrared, electronic and EPR spectra. The complex compounds have various co |
|
Studiu cinetic comparativ asupra degradarii ciprofloxacinei
in apa prin procese oxidative avansate
Ilie Siminiceanu, Maria- Magdalena Bobu
|
| The experimental results on the ciprofloxacin (CFX) degradation in water by six adavanced oxidation processes (AOPs ) are reported in this paper: UV- H2O2, UV- H2O2- Fe(II), O3, O3- UV, O3- UV- H2O2, and O3- UV- H2O2- Fe(II). The optimal operation paramet |
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Studiu preliminar privind caracteristicile de ardere ale gazului HHO
RADU CHIRIAC, CORNELU DICA, DORIN BOMBOS, STELIAN NEAGOE
|
| One of the classical methods used to investigate the combustion characteristics of a gaseous fuel is the constant volume combustion. If this method is associated with an optical investigation technique, i.e. the Schlieren technique, the combustion process |
|
Analiza multidimensionala a datelor privind calitatea apei lacului Brates in perioada 1995-1996
Costel Sarbu, Alexandru Pop, Paula Popa
|
| Systematic and rational studies concerning the water quality of the Brateș Lake were performed for the period 1995-1996. Cluster analysis and principal component analysis enabled more rational and objective estimation and comparison of the samples and ch |
|
Aplicatii ale zeolitilor naturali in eliminarea metalelor din apele uzate si in catalizarea unor reactii chimice organice. II. Condensarea aldehidelor inferioare catalizata de clinoptilolit natural modificat prin schimb ionic cu cationi metalici
Emi |
| The catalytic performances of Men+-containing natural clinoptilolite (Men+ = Ni2+, Cd2+, Pb2+, Fe3+, Cr3+) in vapor-phase condensation of acetaldehyde and formaldehyde were investigated. The activity of cation-exchanged forms, in terms of overall conversi |
|
| Cercetarea toxicologica a fluorurii acidului 2-etilhexanoic |
| This paper presents the toxicological effect of the fluoride 2-etilhexanoic acid on withe rat (Rattus sp.) when administrated orally, parenterally and through the epidermis. The research proves the remarkable degree of toxicity of the product and its effe |
|
Comportarea la coroziune a sistemului otel carbon/pelicula acrilica/electrolit
Mihai V. Popa, Paula Drob, Ecaterina Vasilescu, Maria Anghel, Agustin Santana Lopez, Iulia Mirza Rosca
|
| The corrosion behaviour of carbon steel coated with acryl film was investigated by electrochemical measurements (electrochemical impedance spectroscopy, anodic stepwise polarisation) as a time function of immersion in 3% NaCl solution. Analysis of Nyquist |
|
Determinarea cinetica simultana a doua amine secundare prin regresie dupa componente principale
Vasile David, Iulia Gabriela David, Gabriel L. Radu
|
| Multi-component analysis carried out by differential reaction rates methods is a simple strategy to discriminate, without separation, the substances pertaining to an homologous chemical series. Otherwise, they are more difficult to be determined simultane |
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Dinamica acumulării zaharurilor în struguri
Luoana Pascu, Luminita Vladescu
|
| In this paper were analysed the results obtained after the determination of ranges concentration from seven varieties of white and black grapes representative for Dragasani-Valcea vineyard at similar dates between the 10th of August and the 10th of Octob |
|
Electrochimia fenomenelor de interfata.V. Originea si alura curbei capacitatii diferentiale a regiunii de interfata
|
| The expresion of the differential capacitance of the interfacial region is obtained as a mathematical function of the electric charge quantity pertaining to a certain adsorbed species in the region. It is starting from the recently obtained expression o |
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Haldele de zgura si cenusa de la CET Isalnita si impactul lor asupra atmosferei.
Aspecte calitative
Ionel Bala
|
The paper deals with the Isalnita power plant flying ashes monitoring over a period of three years. The study illustrates the dominant wind directions and frequency on seasonal dust pollution in nearby area.
Keywords: flying ashes, seasonal dust, p |
|
Inelele de reazem ale agregatelor cu tambur rotativ. III. Aspecte privind montarea si comportarea in functionare
Gheorghe Ene
|
| In this paper there are presented the determination modalities of the clearance between the ring and the drum in case of assembling (cold) as well as in case of exploitation (hot). Except this, there are also presented a series of aspects concening the fu |
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Influenta solventului asupra spectrelor electronice de absorbtie si emisie ale unor derivati antracenici in amestecuri binare si ternare
Georgeta Strat, Mitachi Strat, Irinel Grecu
|
| The pure electronic transition frequencies in absorption and emission bands have been determined for anthracene and some anthracene derivatives when dissolved in a large number of polar and non-polar solvents. The shifts of the pure electronic transition |
|
Metode chimice de combatere a fenomenului de umflare a argilelor
Eugen Traista, Aronel Matei, Georgeta Barabas
|
| During the watering process,on the argillaceous particles surfaces it appears a negative electrical charge by hydrolysis. Due to this, the argillaceous particles in water will have the behavior of some electrical charged particles. The electrical charge |
|
Modelarea comportamentala a sistemelor lipidice compuse din acizi grasi
Maria Honciuc, Viorel-Puiu Paun |
In this paper we present a phenomenological model concerning the electrical behavior of some fatty acids mixtures. The theoretical results are in good agreement with the experimental ones.
Keywords: fatty acids, relaxation time, spatial charge
|
|
Noi derivati glicozilici ai 3-mercapto-1,2,4-triazol 5-substituit
|
| The glycosylation by Ferrier method of 3-mercapto-5-o-chloro-phenyl-1,2,4-triazole with 1-O-acetyl-2,3,4,6-tetra-O-acetyl-â-D-glucopryanose leads exclusively to S-glycoside. The formation of 1N-, 4N- or 1N,S-diglycosides was not observed. The assignment |
|
Oxidarea in fază lichidă a para - izopropiltoluenului la acid para-izopropilbenzoic
|
| The oxidation reaction of para - izopropyltoluene to para - isopropyl benzoic acid is investigated in liquid phase in organic polar solvent, without cobalt acetate catalyst promoted by cyclohexanone or methyl ethyl cetone. It was especially followed the |
|
Poluarea solurilor forestiere si agricole cu metale grele
Vasile Viman, Mariana Morar, Gheorghe Vatca, Anca Mihaly-Cozmuta,
Leonard Mihaly-Cozmuta
|
| The paper presents some aspects concerning pollution of forester and cultivated soils with heavy metals. There is presented with details the stage of collecting the soil samples from the sites placed near the most pollutant sources of Baia Mare, one of t |
|
Pompe de căldură cu functionare pe baza reactiei de acetalizare metanol / propanal
Razvan Onofrei, Alexandru Bita
|
| In the specialized literature there are presented different aspects concerning the constructive functional description of some heating pumps whose functioning is based on the utilization of a gas-gas reversible chemical reaction. In this paper there i |
|
Recuperarea plumbului din amestecurile galena - cuart si ceruzit - cuart sau calcit cu 8 - hidroxichinolina
|
| The influence of reactive (8-hidroxyquinoline) concentration of the lead recovery from galene - quartz, cerusite - quartz or calcite mixtures on the lead percent in the concentrated obtained after flotation using a microcell was studied. The maximum rec |
|
Separarea amestecurilor eterogene. VI. Sedimentarea electrostatica: modelarea matematica a procesului
Tiberiu Dinu Danciu, Emil Danciu
|
| All elementary steps of the electrostatic sedimentation process in a space with cylindrical symmetry for ascending flow of heterogeneous mixtures s, l / g are quantitatively inspected. Equations from domains literature are commented and transcribed in th |
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Sinteza, caracterizarea si aplicarea unor coloranti reactivi alfa-hidroxipropenilsulfonilici
Ion Sebe, Madalina Rotaru
|
| It is presented the synthesis of some anilide ?-hydroxi-propenylsulphonyl-substituted and of some derivated azoic dyes. In this way, by diazotization of 4-(3-hydroxipropenyl-1,2-enylsulfonyl)anilide and by coupling to the monosodic salt of the H acid, |
|
Studii privind unele structuri supramoleculare conductoare realizate electrochimic in solutii aprotice de benzochinona
Gheorghe Semenescu, Ion Iosub
|
| By cyclic voltametry studies in 10-2M solutions of benzoquinone (BQ) in dimethyl formamide (DMF) (on electrolyte support of 10-2M LiClO4), were observed the formation conditions of some supermolecular structures in the interelectrodic space as well as som |
|
Substrate cromogene specifice pentru alfa - amilaza (I)
|
| Two new specific chromogeneous substrates, obtained by either adsorbtion of methylene blue on the crosslinked starch, or by covalent bonding of the starch with natrium alyzarine sulphate, designed for the ?-amylase enzymatic activity determination, are de |
|
Utilizarea unor schimbatori de ioni anorganici in cromatografia pe strat subtire. I. Separarea unor complecsi pe silicat de zirconiu (IV)
|
| Some chromatographic plates with zirconium silicate settled on silica or alumina were used in dissociating some complexes using different mobil phases. In order to detect these complexes in the layers composition was introduced a luminifor composed of gal |
|
| Coloranti derivati ai sistemului heterociclic compact condensat 2-aminotiazolo<4,5-b>piridina |
| This work presents the synthesis of disperse and cationic dyes with thiazolo-pyridine rings. The stability of compact condensed substances having thiazolic ring is characteristic to every aromatic ring. Thus, the special biological activities of the thi |
|
| Comportamentul lipidelor in camp electric.1. Amestecuri de acizi grasi, colesterol, glicerol |
| Fatty acids are abundant in biological membranes, mainly as components of phospholipids and cholesterol esters. Their presence, free or bound to phospholipids, modulates the lipid membrane behavior. This study shows a phenomenological model concerning the |
|
| Compusi heterociclici derivati de 1,2,4-triazol |
| The synthesis and characterization of some new heterocyclic compounds is described. 1-Chloromethylen-3-<4/-aminopheylen>-4-aryl-5-mercapto-1,2,4-triazoles contains two reactive groups: -NH2 and CH2Cl. The amino group reacted with ethyl chloroformate |
|
| Cuantificarea stresului oxidativ in biosisteme. III. Comportarea la peroxidare si iradiere UV a unor vitamine |
The paper presents simulation tests of some modifications induced by peroxidation and UV irradiation on some natural and synthetic vitamines following their effects by spectral and chemiluminescence tests.
Keywords: oxidative stres, spectroscopy, chemil |
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| Determinarea vitaminei A si E din produse farmaceutice prin cromatografia de lichid de inalta performanta |
| In this paper there are presented the research results regarding the establishing of the optimal working conditions for the determination of vitamins A and E in multivitamine pharmaceutical products. Following this study, it was determined a sensitive, s |
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| Echilibrul izoterm lichidvapori in sisteme binare ale alcanilor cu cloroalcani |
| Vapourliquid equilibrium (VLE) data for the binary systems : nheptane + 1chloropentane at 330 and 370 K and noctane + 1chlorobutane at 333.15 and 348.15 K and vapour pressures (VPs) of both chloroalcanes were measured by a circulation method. The VL |
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| Fractia de goluri in coloane cu barbotare I. Influenta conditiilor hidrodinamice |
| There are several methods to perform experimental measurements of the overall gas hold-up in bubble columns but none of them is considered to be a standard method for measuring this parameter. The precision of measurements lies between 10 20%, and improv |
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| Influenta agentilor reducatori la obtinerea rubinului de cupru ecologic |
| The interest for the glasses of the copper ruby type is re-actualized due to present general tendency to avoid the fabrication and the use of products, with a content of toxic or potential pollutant substances. Copper gives a red color as a result of some |
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| Influenta presiunii partiale a hidrogenului sulfurat asupra hidrodesulfurarii adanci a combustibililor Diesel |
| Deep hydrodesulfurization of gas oils to sulf levels 30 50 ppm is rendered difficult by the presence of refractory species as part of a spectrum of sulf compounds that have widely different reactivities. The aim of this research is to study the deep hy |
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| Materiale solide polidisperse utilizate pentru adsorbtia lichidelor petroliere |
| The aim of this work was to examine, evaluate and characterize several oil spill sorbents, focusing on their use in conditions that are most relevant to Romanian polluted environments. The tested petroleum liquids were typical Romanian products. The perfo |
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| Polioxometalati lantanidici folositi in cataliza organica oxidativa |
| Studies on the lanthanide polyoxometalates with Keggin and Wells-Dawson modified structures in catalysis are presented. The polyoxometalates: Na12H3<(CeO)3(OH)2(PW9O34)2>45H2O and K1642H2O were tested as potential catalysts in the oxi |
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| Proprietatile termodinamice de curgere viscoasa pentru sistemul acid propionic-toluen |
| The goal of the paper is the determination of the dynamic viscosity (Łb) for propionic acid - toluene solutions, for various concentrations and temperatures. On the basis of the experimental data, the applicability of the Guzman-Andrade and Walther-Ubbel |
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| Reactia acidului 6-amino-4-hidroxi-2-naftalensulfonic cu disulfura de tetrametiltiuram |
| In this paper was studied the reaction between tetramethylthiurame disulphide and 6-amino-4-hydroxy-2-naphtalenesulphonic acid, being known that this acid is a very important intermediate in colours industry. The synthesis was performed varying molar r |
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| Recuperarea aurului din solutii de cianuri cu ajutorul ionitilor comerciali |
| The results obtained by using some commercial anions and selective exchange resins for gold and silver recovery from hydrometallurgical cyanide solutions are presented. Selective, intermediate base and strong base commercial resins were investigated. Sor |
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| Studii asupra comportamentului termic al fosfatului de cobalt amoniu |
| This paper presents data on the thermal behaviour of some cobalt phosphates precipitated during the mixing of CoCl2 and (NH4)2HPO4 solutions, without or with a subsequent addition of ammonia. The TG and DTG curves of the precipitated products were regist |
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Cercetari recente asupra transferului de electroni mediat si direct intre enzime redox si electrozi
Anton Alexandru Ciucu
|
| The most promising approach for the development of electrochemical biosensors is to establish a direct electrical communication between the biomolecules and the electrode surface. The article overviews the fundamentals of the phenomenon of direct and med |
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Combinatii complexe ale unor metale tranzitionale d
cu ligandul izonicotinoilhidrazon-2-hidroxi-1-naftaldehid
ANGELA KRIZA, LIVIU MITU, NICOLAE STANICA |
| This paper presents the complex compounds of the Cu(II), Ni(II), Zn(II), Cd(II) ions with a hydrazone-type ligand. The compounds were obtained through a template condensation reaction, between the isonicotinoylhydrazine and 2-hydroxy |
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Complecsi cu transfer de sarcina ai bazelor Schiff derivate de la acidul p-aminobenzoic cu acid picric
Carmen Topala, Gabriela Ionita |
| Five Schiff bases derived from the p-amino- benzoic acid were synthetized using the method described by Vogel. When these Schiff bases were reacted with picric acid as acidic acceptor in the ratio 1:1, stable coloured charge transfer complexes (CTCs) we |
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Consideratii cu privire la sporirea capacitatii de retinere a mediilor filtrante
MIREL ION, VASILE PODE, CONSTANTIN FLORESCU, CORNELIU PODOLEANU1, FLORIN BATEA |
| In this paper are studied, by descendent filtration, the methods to increase the storage capacity of filtering medium through optimization of homogeneous and inhomogeneous filtrating structure, through rising the velocity of filtration and using the filtr |
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Coroziunea unor oteluri si aliaje in medii amoniacale
Eva Trimbitasu, Vasile Dumitrescu, Octav Pantea |
| This paper presents a study concerning the corrosion of several steel and alloy (OL 37, W 4571, brass and Monel) at alkaline pH obtained with ammonia cal solutions. The corrosion gravimetrically tests were done by weight loss method of the corrosion sampl |
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Determinarea unor urme importante de substante potential toxice din citrice
ALINA SOCEANU, VIORICA POPESCU, VASILE MAGEARU, SEMAGHIUL BIRGHILA,
SIMONA DOBRINAS, NICOLETA MATEI |
| The aim of this work is to present the analysis of some citrus fresh fruits (oranges, lemons and grapefruits). In this context an investigation was undertaken to determine the metal contents: cooper, lead, chromium, zinc and nickel in different components |
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Electrodializa solutiilor de sulfat de amoniu
ILIE SIMINICEANU, IOAN-LUCIAN COTET |
| Electrodialysis experiments of diluted ammonium sulphate aqueous solutions have been performed on a laboratory-scale TS-2 stack containing five cell pairs of ion exchange membranes with an effective area of 200 cm2 each. The CMS cation exchange membranes |
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Enzime proteolitice in mediu organic
II. Influenta factorilor de mediu asupra rezolutiei cinetice a esterilor metilici ai unor aminoacizi aromatici in solventi organici
GABRIELA PREDA, FRANCISC PETER, BENIAMIN PINTEA, CAROL CSUNDERLIK,
ADRIAN CHIRIAC |
| Due to their high selectivity for L-amino acids, the proteinases have been widely used in enantio- and regioselective transformations of amino acids and structurally related substances. They possess esterase activity and are useful for ester hydrolysis. |
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Fractia de goluri in coloane cu barbotare (III)
Influenta adaosului de substante tensioactive in faza continua
Irina Pincovschi, Mihaela Mihai |
| This paper studies the influence of ionic surfactants on overall gas hold-up in air-distilled water dispersed system. Experimental results were correlated with bubble size distribution and flow structures. The physical model of Lieppe (1988) was used in o |
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Modelarea fenomenologica bazica a comportamentului reologic al
fazei ternare in sisteme compozite de polimeri de faza. II. Perspectiva deformarii uniforme
Horia PAVEN |
| Aiming at revealing the intrinsic peculiarities of phenomenological principles of modelling ternary phase in phase composite systems with linear viscoelastic polymeric components, the second basic case of uniform stress approximation is considered. In |
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Noi compusi pirazolil-benzensulfonamidici N-substituiti ca analogi ai inhibitorului Cox-2 selectiv. II. Derivati N-monosubstituiti
MARIA CROITORU, LUCIA PINTILIE, CONSTANTIN TANASE, MIRON TEODOR CAPROIU, CONSTANTIN DRAGHICI |
| he paper presents the synthesis of structural analogues of COX-2 selective inhibitor Celecoxib, obtained by N-monoalkylation of the nitrogen sulfonamide atom. The new synthesized compounds were purified by crystallization and characterized by m.p., eleme |
|
Proprietati electronice ale tuburilor C80-xNx
cu geometrie scaun
SIMONA RADA, IOAN SILAGHI DUMITRESCU, VISTRIAN MATIE, MARIUS RADA |
| The influence of nitrogen content on structural, energetic and electronic properties of doped (5,5) carbon nanotubes has been investigated. It was found that small quantities of nitrogen into the carbon nanotube cause a decrease of the thermodynamic stabi |
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Radioliza apei in prezenta unor catalizatori de tip zeolitic
Alexandru Cecal, Karin Popa, Andrei Octavian Paraschivescu, Dan Colisnic, Ada Macovei |
| This work comprises a study about the water radiolysis in the presence of some zeolites as catalysts, in order to obtain hydrogen. As a girradiation source, it has been used a radioactive nuclide 60Co having an activity of 5.9Ž105 Ci, and a rate dose of |
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Riscuri de mediu ale proceselor chimice de extragere a aurului din minereuri
IOVANCA HAIDUC |
| The paper takes into consideration the chemical processes involved in the extraction of gold from mineral ores, with emphasis on cyanide leaching. The chemistry of the process, detoxification of cyanide and environmental effects are commented upon. Alter |
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Rosia Montana in pericol de dezastru ecologic
Raluca M. Florea |
| Roșia Montana represents a gold mining area in the north west of Romania, in the Carpathian Mountains. The ecosystem around it was destroyed partially due to the development of gold mining industry along the years. The actual tendency, to start a large |
|
Sinteza sarii acidului 2-cloroetilfosfonic cu HMPT si activitatea sa
ca regulator de crestere a plantelor
Adrian CAPRITA, Rodica CAPRITA, Gheorghe ILIA |
| To obtain new compounds with phytoregulator applicability, the 2-chloroethylphosphonic acid salt with hexamethylentetraamine was synthesised in good yields. The optimum reaction conditions were established. The obtained substance was tested regarding its |
|
Sinteza si activitatea biologica a sarurilor dicuaternare
derivate de la 4,4-bipiridil
ALEXANDRU ROTARU, RAMONA DANAC, IOAN DRUTA, GABI DROCHIOIU, IGOR CRETESCU |
| he manufacturing process of some novel non-symmetrically substituted diquaternary salts derivatives from 4,4-bipyridyl was carried out in two synthesis steps. The obtained compounds present a high biological activity and can be used as precursors for the |
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Sinteza si caracterizarea acidului dichinoxalin<2,3-b><2,3-e>piperazin-6,6-dicarboxilic si a acidului dichinoxalin<2,3-b><2,3-e>piperazin-6,7-dicarboxilic
Cristiana Radulescu |
| Two heterocyclic systems, diquinoxaline<2,3-b><2,3-e>piperazine-6,6-dicarboxylic acid and diquinoxaline<2,3-b><2,3-e>piperazine-6,7-dicarboxylic acid, were synthesized. These compounds have been characterized by elementary analysis, melting points, mole |
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Sinteza si caracterizarea spectrala a unor amide aromatice avand ca precursor acidul 2,3-trimetilenchinolin-4-carboxilic
Madalina Hrubaru, Bogdan Draghici, Maria Maganu, Marieta Plaveti, Florin Badea |
| Seventeen new substituted 2,3-dihydrocyclopentaquinolin-4(N-aryl)-carbamoylamides were obtained in good yields by condensation of acid chloride chlorhidrate of 2,3-dihydrocyclopentaquinolin-4-carboxilic acid with the corresponding anilines. The stru |
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Sinteza unor arilazofosfonati prin reactia de cuplare azot-fosfor
RAMONA MOLDOVAN, GEORGETA MARIA SIMU, SIMONA GABRIELA HORA, GHEORGHE ILIA |
| Using the Nitrogen-Phosphorus (N-P) coupling reaction, six arylazophosphonates were synthesized. The diazocomponents were aniline, p- and m- nitroaniline. The coupling components were the dimethyl and diethyl phosphites. The compounds were obtained in hig |
|
Studiu comparativ al contaminarii cu metale grele din miere si sursele florale provenite dintr-o zona poluata chimic
IULIANA BRATU, CECILIA GEORGESCU |
| Changes in the quality of bee honey are also caused by the contamination with micro-polluting agents, toxic to consumers. This research is about chemical contamination of honey. The honey used in this study was harvested from beehives situated in Copșa Mi |
|
Studiu privind retentia produselor petroliere in sol
Gheorghe Brebeanu, Tanase Manolache, Adrian Georgescu,
Maria-Cristina Mertl, Sorin Hant |
| Fluids behavior in rock layers is a major problem in the study of depollution possibilities of petroleum products contaminated soils. The penetration depth and horizontal dispersion of petroleum products in the soil, as result on technical accidents, dep |
|
Valorificarea unui reziduu galvanic in industria sticlei
Camelia Capatina |
| n Romania there are wastes from metallurgical and machine building industries. Some wastes contain toxic metals that are dangerous for people and environment. The investigated waste is a suspension and must be dried. This paper is focused on the incorpor |
|
Determinarea extractiv-spectrometrica cantitatilor în urme de plumb (II)
cu 18- coroan-6 si galben de metanil
AURELIA TAR*, CONSTANTIN LUCA
|
| A simple and sensitive extractive-spectrometric method for the determination of lead (II) is proposed. The method is based on the extraction of the ion-associate formed by a lead (II)-crown ether cationic complex with Metanil Yellow as the anionic counter |
|
Adsorbtia surfactantilor cationici la interfata bumbac/apa
ELENA IRINA MOATER, MIHAELA OLTEANU, CRISTIANA RAULESCU, IONICA IONITA, ANA-MARIA HOSSU
|
| It was established the form of the adsorption isotherms on cotton of some cationic surfactants (type alkylpyridinium chloride) with bacteriostatic and bactericide properties that belong to class L, subclass 4, in concordance with the isotherms classificat |
|
Analiza HPLC a compusilor polifenolici din extractele obtinute
din flori si ramuri tinere de Elaeagnus Angustifolia L.
Laura Bucur, Laurian Vlase, Cristina Fodorea, Viorica Istudor
|
| The Elaeagnus angustifolia L. (Elaeagnaceae) species, russian olive, is frequent in Romania, usually in the Black Sea shore area and it is very little investigated for therapeutic valorification. Knowing the wide spreading of flavonoids and polyphenolcarb |
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Aspecte ale electrooxidării dimetileterului în mediu alcalin
Maria Ileana IONITA, Niculae ENE
|
| The behaviour of dimethylether (DME) electrooxidation on Pd and Pt modified electrodes have been investigated in alkaline solution (0.5M KOH) using the cyclic voltammetry.Three effects have been considered: the DME bubble time effect, working electrode na |
|
Caracteristicile anticavitaționale ale oțelurilor inoxidabile
cu transformare controlată
Ion MITELEA, Ilare BORDEASU1, Anton HADAR
|
| Paper scientifically substantiates the basic criteria in designing the chemical composition of stainless steels 17-4 P.H. with controlled transformation. All the new designed steels for hydraulic turbines are compulsory tested to cavitation erosion in two |
|
Combinatii complexe ale Co(II) cu hidrazina si sulfonamide
VIOLETA TUDOR, ADRIANA GHEORGHE, NICOLAE STANICA, MARIETA PLAVETI4, MARIA BREZEANU
|
| Four new complex compounds of Co(II), 2(5), 2(6), (7), n, (8), with hydrazine (N2H6) and heterocyclic sulfonamides, H2acm (N-<5-(aminosulphenyl)-1,3,4-thyiadiazole-2-yl>ace |
|
Degradarea prin coroziune a structurilor din beton armat
1. Studii privind coroziunea structurilor din beton armat
aferente metroului din Bucuresti
IOSIF LINGVAY , MARIUS GABOR, CARMEN LINGVAY
|
| This is a study of corrosion states of the resistance structures of concrete steel afferent to Bucharest underground tunnels and galleries, by measuring the reinforcement/wet concrete electrochemical potentials. By specific electric determinations, DC st |
|
Imbunatatirea operarii instalatiei de tratare a apelor uzate prin controlul dupa model predictiv
Vasile-Mircea Cristea
|
| The biological Waste Water Treatment plants have a continuous growing importance for the sustainable development of modern society. The paper presents solutions for the control system design for the aerobic suspended growth wastewater treatment plant. Inv |
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Izomerizarea termica a tris(2-cloroetil)fosfitului
si transformari consecutive
IOAN Talos, Alfa-Xenia LUPEA, CONSTANTIN TARABASANU MIHAILA, GEZA Bandur
|
| The paper presents the results of kinetic study for tris(2-chloroethyl)phosphite isomerization at temperatures varying between 160-190 oC. The experimental data verify the first kinetic order only for the evolution of phosphite concentration and not fo |
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Modelarea si simularea procesului de carbonatare a saramurii amoniacale din cadrul tehnologiei de obtinere a sodei calcinate
Calin Cristian Cormos,Ana Maria Cormos, Serban Paul Agachi
|
| In this paper the modeling and the simulation for carbonation process of ammoniacal brine solution have been described. Carbonation process of ammoniacal sodium chloride solution (brine) is used to obtain sodium bicarbonate and sodium carbonate in soda as |
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Monitorizarea rezistentei la coroziune a unui bioaliaj de titan
MIHAI VASILE POPA, ECATERINA VASILESCU, PAULA DROB, DANIELA IONITA, CORA VASILESCU
|
| The corrosion resistance monitoring of some titanium Ti-45.5Ni alloy in Hank solution and artificial saliva (Tani&Zucchi, Fusayama, Carter-Brugirard) is studied in this paper. The anodic curves in Hank solution characterised passive systems; pitting corro |
|
Pelicule pe bază de chitosan și acid hialuronic
pentru imobilizarea de enzime studiate prin microscopie laser confocală cu baleiaj
Eugenia Teodor, GABRIEL LUCIAN Radu, CRISTIAN Dan, GEORGE A. Stanciu
|
| Biopolymeric films were obtained by mixing different ratios of 2% (w/v) chitosan and 1% (w/v) hyaluronate solutions. Chitosan/hyaluronic acid films were cross-linked with sodium citrate by soaking chitosan/hyaluronic acid films into a sodium citrate solut |
|
Prepararea membranelor
fosfazenice de nanofiltrare
Ioana Viezure, Liliana Pasare, Daniela Rata1, Florina Dumitru, Cornelia Guran
|
| Four phosphazene composite membranes G1-G4 were prepared using a solution casting method. Casting solutions were prepared from dioxane with 0.1% silica gel and 15-20% polymer support. The silica gel was obtained by the acid catalyzed sol-gel reaction of t |
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Reactia clorurilor acide ale acizilor o, m, si p-toluici cu nitrobenzenul activate ultrasonic si termic.
I. Reactia clorurii de o-toluil cu nitrobenzenul
Florica CHIVU , Liliana LUNGU, Petru FILIP, Mircea VINATORU
|
| In addition to our study concerning the influence of ultrasounds upon a rather non reactive system (benzoyl chloride and nitrobenzene) <1>, the reaction of acid chlorides of toulic acids were investigated. The first part of this series, the reaction of ni |
|
Realizarea unor noi produse de uz radiofarmaceutic bazate
pe radionuclizii: 186,188Re , 153Sm, 99Mo
CATALINA CIMPEANU1, Nicolae NegoiTA, Catalina Barna, Ion Mihalcea
|
| This study presents the results of the work carried out for radionuclides preparation in order to develop new of diagnosis and therapeutic radiopharmaceuticals. All radionuclides presented in this work have been obtained by irradiation with thermic |
|
Retardant de crestere a plantelor cu utilizari în horticultura
ADRIAN CAPRITA, RODICA CAPRITA, GHEORGHE ILIA
|
| Besides the growth retardant effect, which, in most cases is the main purpose, the plant growth retardants can be successfully used for the treatment of vegetable crops in order to increase the yields and to improve the quality of the products. 2-Chloroet |
|
Saruri ale acizilor carboxilici cu chinoline, cu potentiala
activitate biologica
3. Saruri ale diferitilor acizi carboxilici aromatici cu 8-hidroxichinolina
MATA GROZAV, ZOLTAN SZABADAI
|
| The preparation and characterization using spectroscopic and elemental analysis of a series of four salts, for so called proton-transfer compounds of 8-hydroxyquinoline with four aromatic carboxylic acids 4-aminobenzoic acid, salicilic acid, 5-sulfosalic |
|
Studiu teoretic asupra transportului polimerilor prin nanopori
VIOREL-PUIU PAUN
|
| The process of charged polymer translocation, driven by an external electric potential, through a narrow pore in a biological membrane is studied. The translocation of a single-stranded polymer through a nanopore may be well described by a 1-D diffusion m |
|
Studiul descompunerii trifosgenului si difosgenului în fosgen
în prezenta catalitica a unor halogenuri de tetraalchilamoniu
si fosfoniu
Monika Simon, Carol Csunderlik
|
| It is known that trichloromethyl chloroformate (diphosgene) and bis(trichloromethyl) carbonate (triphosgene) could be formally considered the dimer and trimer of phosgene even if they are not directly derived from carbonyl chloride. Recently, the catalyze |
|
Studiul prin chemiluminescențta
al unor polimeri care contin cicluri aromatice
Silviu JIPA1, Traian ZAHARESCU, Laura Monica GORGHIU, Crinela DUMITRESCU,
Radu Lucian OLTEANU
|
| The thermal oxidation of polystirene, poly(-p-divinyl-benzene) and butadiene-a-methyl styrene copolimer has been studied by the chemiluminescence (CL) method. The CL method proved to be very sensitive to detect oxidative degradation. Judging from the acti |
|
Studiul comparativ privind determinarea unor tocoferoli
prin cromatografia de gaze directa si cu derivatizare
MIHAIL-SIMION BELDEAN-GALEA, AUREL MOCAN, COSTEL SARBU
|
| A validation study concerning the separation and determination of a-, g-, and d- tocopherol is reported. Direct and derivatization (using N-metil-trimetilsilyl fluoroacetamide) gas chromatographic method were compared from statistical point of view consid |
|
Studiul separarii amestecurilor gazoase binare
prin adsorbtie în strat fix
STELIAN PETRESCU, IRINA GALBEN, ROXANA COZMA
|
| Mass transfer in binary gaseous mixtures separation by dynamic adsorption in fixed bed was studied in this paper. A mathematical model available under isotherm condition, which contains coefficients and constants that are easy to predict, was established |
|
Tehnici complementare de spectroscopie RES și deconvoluție FT-IR utilizate în studiul
conformației și stabilității proteinelor din produse farmaceutice
SIMONA CAVALU
|
| Long term-stability is critical in the successful development of pharmaceuticals, including macromolecules. Useful information on protein properties can be obtained by noncovalent spin labelling if the affinity of the protein for the label molecules is gr |
|
Transformarea legaturii cristal-cristal de dihidrogen în legatura covalenta
in complecsii NaBH4. THECN si NaBH4. THBCN
GABRIELA BLANITA, MIRCEA VLASSA
|
| Crystal-to-crystal dihydrogen to covalent bonding transformation of complexes of N,N,N-tris-(2-hydroxyethyl)-triazacyclononane(THECN) and N,N,N-tris-(o-hydroxy- benzyl)-triazacyclononane (THBCN) with NaBH4 is presented. As a result, materials with e |
|
A.Pui, I. Berdan
Studii privind formarea compusilor coordinativi ai Cu(II) cu baze Schiff
|
| The Schiff bases are azomethinic compounds formed through the reaction of an aldehyde or ketone with an amine. They may act as bi-, tri-, tetra- or pentadentate ligands, which contain, in principle,donor atoms of nitrogen and oxygen. Their coordination to |
|
Aurelia Cristina Nechifor, Elena Ruse, Gh. Nechifor, Bogdan Serban
Calixarene - transportori in membrane lichide. III. Transportul cationilor Pb2+ prin membrane lichide cu tio-calix<4>arene
|
| p-t-Buthylthiacalix<4>arene, in which the four methylene bridges of p-t-buthylcalix<4>arene are replaced by sulfide linkages, is conveniently synthesized from mixture of p-t-buthylphenol and elemental sulphur, tested in transport of metal cations through |
|
D. Brasoveanu, Mihaela Mihai, M. Belcu, I. Untea
Absorbtia dioxidului de sulf in baze organice. Echilibrul interfazic in solutii apoase de di-n-butilamina si metil-dietanolamina
|
| The paper presents more experimental data refering to the equilibrium of the sulphur dioxide absorption process using amine aqueous solutions. Numerical values for Henry and apparent Henry coefficients and for the solution saturation degree were calculate |
|
Doina Humelnicu, Al. Cecal
Aspecte ale investigarii produsilor intefazici de tip CRUD rezultati in tehnologia nucleara
|
| This paper presents some aspects of the study on the CRUD products. These products appear at the interface aqueous/organic phase during the extraction processes of uranium with organic non-miscible solvents. Some methods of destroying these products, esp |
|
M. V. Popa, Ecaterina Vasilescu, Paula Drob, Cora Vasilescu, Maria Anghel
Caracterizarea filmelor pasive pe titan si aliajul ternar Ti-Ni-Mo
|
| The corrosion and passsivation behaviour of the titanium and ternary Ti-1Ni-0.5Mo alloy in sulphuric acid solutions of different concentrations, at various temperatures is studied. Both the titanium and Ti-1Ni-0.5Mo alloy are passivated in sulphuric acid |
|
Maria Jitaru, Alexandra Scorteanu, Cristina Moldovan
Contributii privind electroreducerea unor coloranti azoici
|
| The electrochemical data (cyclic voltammetry) concerning different azodyes in aqueous Britton-Robinson buffer solution (pH=1.81-12.2) and EtOH-0.25M LiClO4, on glassy carbon electrode are presented. There are two types of azodyes of interest in this work: |
|
T. Tolea, I. Gh. Tanase, Iulia Gabriela David
Influenta concentratiei de receptori din membrana asupra dinamicii potentialului acesteia
|
| This paper presents the results of investigations carried out on some liquid membranes constituted at the interface between a liquid organic medium containing different dipicrilamine concentrations and an aqueous medium containing variable concentrations |
|
Comportamentul de cristal lichid al unor amestecuri de acizi grasi
Maria Honciuc, V. P. Paun
|
|
|
Compusi 2-cloroetilfosfonici grefati pe copolimeri stiren-divinilbenzen prin punti de tip N-g-aminoetil-aminometil, N-d-aminopropil-aminometil si respectiv N-b-aminobutil-aminometil
Adriana Popa, Corneliu-Mircea Davidescu
|
Synthesis of phosphonic acids grafted on copolymers with spacer-chain is described.
Spacer-modified supports containing N-b-aminoethyl-aminomethyl, N-g-aminopropyl-aminomethyl and N-d-aminobuthyl-aminomethyl linkages were prepared by alkylation polymer- |
|
Coroziunea otelului TC3 60/45 in medii alcaline
Eugen Roman, Corina Radulescu
|
| The electrochemical behaviour of the TCz 60/45 steel in alkaline environment is influenced by the concentration of the solution (4-33%), the aeration, the temperature (20-800C) and the sensitizing of the through heating (8500C). The corrosion process is c |
|
Determinarea unor pesticide organoclorurate din apa Marii Negre
Simona Dobrinas
|
| This study content the results obtained for some pesticides from Danube and Black Sea Coast by Gas Chromatography with Electron Capture Detector (GC-ECD) between August and October 2001. It is important to know the concentration of these harmful organic |
|
Electrochimia fenomenelor de interfată. IV. Originea curbei polarografice si semnificatia fenomenologică a principalelor elemente care o caracterizează
Teodor Tolea, Ion Gh. Tanase, Constantin Luca
|
| The present study is aiming to reveal the origins and the dynamics of the polarographic wave, and to reach the mathematic expression of the function characterizing it. It is starting with the recently obtained mathematic expressions of the electric potent |
|
Extractia lichid-lichid in coloane cu umplutura structurata II. Studiul transferului de masa
Claudia-Irina Koncsag, Costica Stratula |
| The study of the liquid- liquid extraction in a column equipped with structured metal packing was proposed. For this purpose, hydrodynamic and mass transfer studies were performed on the packing SMV 350 Y especially conceived for the extraction process a |
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Extrapolarea relatiilor de dependenta capacitate calorica-temperatura la substante dintr-o serie omoloaga
Gabriela Lisa, Silvia Curteanu, Nicolae Aelenei
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Hidratarea unor aluminati de calciu obtinuti din precursori organici
Alexandrina Sim, I. Lazau, Cornelia Pacurariu, M. Lita, D. Becherescu
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| The synthesis of the calcium aluminates: CA, CA2, has been done by thermal decomposition of some complex combinations, the calcium and aluminum glyoxylates. Calcium and aluminum glyoxylates have been obtained by heating at 90ś100°C, in open system, of the |
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Instrument de analiza cu injectie automatizata in flux si metode pentru determinarea clorului din apele potabile
Andrei F. Danet, Mihaela-Carmen Cheregi, Mihaela Badea, Arina Radu, Hassan Y. Aboul-Enein |
| A flow injection (FI) device with spectrophotometric detection based on utilization of a peristaltic pump, four solenoid valves with three ways and a spectrophotometric flow cell were designed and optimized for the chlorine determination in drinking water |
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Modelarea matematica a procesului de recuperare a cuprului din ape uzate. III. Cinetica reactiei catodice
Anca Mihaly - Cozmuta, Leonard Mihaly-Cozmuta, Vasile Viman, Gheorghe Vatca
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| The paper studies the kinetic of catodic of electrochemical recovery of copper from waste waters using copper powders cathode with granullarity in range -0.2+0.125 cm. The kinetic has been settled by comparing the experimental polarisation curves wit |
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Oxidarea benzenului sitoluenului cu peroxid de hidrogen
Petre Chipurici, Lambrache Papahagi
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Poluarea apelor freatice intr-o aglomerare urbana
Ionel Bala, Laurentiu Filipescu |
| The paper deals with the underground water quality in Craiova town area. This town has been extended over large fields on the left bank of the Jiu river (altitude 75 -200m) Downhill springs have been catched in the middle of 18th century and were converte |
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Prevederea termenului de valabilitate / stabilitate a unor medicamente
Lucia Ciohodaru |
| In order to predict the stability at shelf storage ( shelf life ) or at any another desired temperature and to calculate the expiration date of some drugs, the method of accelerated ageing was applied - by using the non-isothermal kinetics. Temperature o |
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Recuperarea aurului din solutii de cloruri cu ajutorul rasinii schimbatoare de ioni selective IONAC-SR3
Mihaela Pavel, Damian Axente
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| The recovery of gold from chloride solutions by a high selective ion exchange resin IONAC-SR3 has been studied. The adsorption isotherm was described by the Freundlich equation. Gold quantities adsorbed on the resin depend on the initial gold concentratio |
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Reducerea radioactivitatii apelor de mina provenite din minele de uraniu
Eugen Traista, Aronel Matei, Georgeta Barabas
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| In uranium mining process, slurries and mining water results. The slurries content in uranium is less than 0.05% U3O8. The waste water content in uranium is also small, so that this water is not dangerous for the environment if it is correctly managed. Th |
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Separarea amestecurilor eterogene. V. Sedimentarea electrostatica: descriere, procedee si geometrii de aparate
Tiberiu Dinu Danciu, Emil Danciu |
| The separation process of high despersed heterogeneous mixtures s, l/g in strong non-uniform electric field is described. Frequently used procedures for retention of condensed phases from industrial gases in processing industries, for air-conditioning and |
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Studii electrochimice pe acid lactic si saruri ale acestuia in sistemul de electrozi Pt-Pt
Gheorghe Semenescu, Gabriel Bratu |
| The paper presents a study on the electrochemical behaviour of the lactic acid and of the sodium and aluminium lactates on the Pt-Pt electrodes system. Considering some concepts such as 'electrodedouble mixed layermodel' and 'mixed chemical bound', a care |
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Studiul proprietatilor chimice ale alchil si arildiclorofosfinelor. I. Sinteze de monofosfine tertiare nesimetrice
Eugenia Fagadar-Cosma, Gheorghe Fagadar-Cosma
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| Caracterizarea spectrala a unor noi compusi terapeutic activi antocian-litiu |
This paper presents the results of studies concerning the chemical structure of semisynthetic compound anthocyan - lithium. In these studies there were used spectral methods IR, UV-VIS spectroscopy, magnetic determinants.
Keywords: anthocyan, anthocya |
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| Cinetica procesului de extractie lichid-lichid a cuprului din solutii de sulfati cu acid naftenic |
| This paper presents the experimental determination of kinetic basic quantities (reaction order n=1, activation parameters E=19200 kJ/mol and A=2.65 . 10-2 m . s-1) of the copper extraction process of some sulphates aqueous solutions with naphtenic acid ( |
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| Coloranti cationici, derivati ai sistemului compact condensat 2-aminotiazolo<4,5-b>chinoxalin-6-acid carboxilic |
| The synthesis of cationic dyes what include thiazole-quinoxalinic heterocycle systems will allow treating the theoretical and synthetical preparation problems concerning synthesis of the heterocycle systems illegible in the speciality literature. The spec |
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| Corelatia dintre puterea de antrenare si inaltimea pistonului rotativ la un nou tip de compresor |
| In the paper, the maximum value of the ratio between rotating piston height and inner radius of compressors semi-cylindrical casing is determined. In addition, a computation relation about compressors theoretical power depending on certain geometrical a |
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| Cristale lichide. 10. Studiu DSC al 2-fluorenil-3beta-colesteril carbamatului |
| A power compensated differential scanning calorimeter was used to make several thermodynamic measurements of the cholesteric liquid crystal: 3Ò-(2-fluorenyl)-cholesteryl-carbamate.For more advanced thermodynamic data, latent heat could be found.Textures |
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| Cuantificarea stresului oxidativ in biosisteme II. Efectul ozonizarii, iradierii UV si peroxidarii |
| The human cells, acting as cell factory, are involved in fundamental processes providing the vital energy of the body. Nevertheless, in some conditions such processes are strongly hindered by the effects of the oxidative stress on physicalchemical phenom |
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| Determinarea experimentala a bazicitatii sticlelor borosodice |
| The paper presents the experimental determination of borosodic glasses basicity and the fact that the obtained values are in agreement with theoretical ones. The obtained data showed that the copper ions comply with the general rule of increasing the ions |
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| Determinarea proprietatilor termodinamice de curgere viscoasa pentru solutia apa-izopropanol |
| The intrinsec parameters of viscous flow represent indispensable characteristics for solution, in various physical and chemical processes in which they are involved. In this respect, the paper aims at determining the viscosity of the Water-isopropyl alco |
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| Determinarea voltametrica prin extragerea anodica a cuprului (II) cu electrozi cu pasta de carbon si salicilaldoxima |
| A method for the determination of copper with a chemically modified carbon paste electrode (CMCPE) based on salycilaldoxime is described. Copper (II) was selectively accumulated, in open circuit, on a CMCPE incorporating salicylaldoxime, followed by strip |
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| Noi saruri chinolinice ale acizilor carboxilici cu potentiala activitate biologica. 2. Sarurile acizlor acetic, cloroacetic si oxalic |
| This paper is concerned with the synthesis, the physicochemical characterization and the biological testing of 8-hydroxyquinoline salts with five carboxylic acids: acetic acid, monochloro-, dichloro-, trichloroacetic acid and oxalic acid. Salt formation |
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| Separarea prin flotatie a Pb (II) si Bi (III) din sisteme apoase. Aspecte cinetice |
| The ions of some heavy metals like lead aand bismuth are important both from the point of view of them being need in different industrial branches, as well as of their toxicity for the living organisms. The oxidic compounds of these metals have special ca |
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| Sinteza rationala de sisteme complexe cu nuclearitati sau dimensionalitati prestabilite |
| The rational synthesis of coordination compounds with pre-determined nuclearities or dimensionalities is of current interest in the chemistry of polynuclear complexes. In this paper it is presented a short review of the principal types of compartmental li |
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| Suprapunerea efectelor la calculul gradientului de presiune, la curgerea fluidelor nenewtoniene |
| Based on the principle of critical energy, a relationship for the effects superposition of the Coutte and Poiseuille flows is established. For a non-newtonian power-law fluid, the pressure gradient relationship for flow under pressure through a section |
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| Utilizarea datelor de echilibru lichid vapori la conducerea unor procese chimice |
The purpose of this work is to show how liquid -vapor equilibrium curves and equations can be used for the controle of a chemical process, in this case the copolymerization of maleic anhydride with vinyl acetate using benzene as solvent.
Keywords: boili |
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| Utilizarea echipamentelor pneumatice de joasa presiune la sinteza experimentala a sistemelor automate din instalatiile de laborator si cercetare |
| Generally, the chemical processes are characterized through the existence of the mass accumulation phenomena, energy or substance, reason for which they are very slow. The experimental simulation of their dynamic behavior is very difficult to achieve prec |
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Actiunea corosiva a apelor de zacamant asupra
componentelor metalice ale pompelor de extractie a petrolului
Floarea MANEA, Ioan TUDOR, Razvan George RIPEANU |
| n this paper it is studied the corrosive behavior in petroliferous water of some metallic components of downhole pumps, as piston-skirt couple, at different temperatures and 70-135 h duration. The evaluation of corrosion process was made by electrochemic |
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Analiza fractala a suprafetei de ruptura a Zircaloy-4
Mircea Olteanu, Viorel-Puiu Paun, Mihai Tanase |
| In this paper there were introduced for the first time some new algorithms, most of them based on Box Counting methods and variations for 2D and 3D structures. The SEM microfractographies of the fracture surface of the Zircaloy-4 samples have been anal |
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| Conferinta Nationala de Echipamente, Instalatii si Inginerie de Proces |
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Detectia electrochimica a unor compusi organici care contin sulf pe un electrod de PbO2 in mediu acid
Florica Manea, Ciprian Radovan, Joop Schoonman, Ilie Vlaicu
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| The determination of sulphur-containing organic compounds (e.g., cysteine, thiourea), using the amperometric detection with PbO2 electrode in acidic media (0.1 M H2SO4) was reported. The calibration plot for cysteine detection was determined for two conce |
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Determinarea umiditatii la polenul apicol prin metoda uscarii cu radiatii infrarosii produse cu o lampa de halogen
IOSIF GERGEN, FLORINA RADU, MARIANA POIANA |
| This work describes the moisture analysis of bees pollen samples from tree different sources of Timiș county using the halogen drying, a new variation of infrared drying. Pollen is a complex bee product that contains sugar, aminoacids, lipids, water, min |
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Distributia tensiunilor in compensatoare lenticulare
Costica ATANASIU, Nicolae ILIESCU, Anton HADAR |
| In the paper a complex analysis is made regarding to the use of analytical, numerical and experimental methods for stress evaluation in the industrial structures. These studies were made in order to establish modern calculus methodologies. The comparativ |
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Echilibrul lichid vapori
IX. Instalatie pentru determinari experimentale la amestecuri binare de monomeri si date pentru sistemul acetat de vinil benzen
EMIL DANCIU, ANCA DUMITRESCU, TIBERIU DINU DANCIU |
| An original conception device for the experimental study of liquid vapour equilibrium in systems containing monomers, together with isobaric equilibrium data for the binary system vinyl acetate benzene, is presented. Correlations are made using equati |
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Evaluarea efectului mediului de lucru cu H2S asupra componentelor instalatiei
Traian Fleser |
| Intensive exploitation conditions may produce differential degradation in raw materials and welded joints of the valves containing fluids with sulphurated hydrogen. The safety in exploitation of these components is influenced by the corrosiove degradatio |
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Evaluarea energiei specifice in procesele de deformare
TEODOR SIMA |
The paper presents the necessary relations for the calculation of the specific energy stored during the deformation process, of the specific coefficient function and the characteristics which define the material transitions for the unstable state.
Keywo |
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Evolutia activitatilor de cercetare, proiectare si fabricatie de echipamente si instalatii de proces in Romania
STELIAN NECULA |
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Imobilizarea dehidrogenazei lactate
pe o matrice electro-polimerizată Meldola Blue
Simona Carmen Litescu, Lucian Rotariu, Camelia Bala |
| The immobilisation of lactate dehidrogenase (LDH) on electrochemically polymerised Meldola Blue (polyMB) films has been accomplished via electrodeposition from monomer solution containing enzyme. These polyMB-LDH electrodes are shown to have a detection l |
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Influenta parametrilor geometrici ai garniturilor asupra etanseitatii asamblarilor cu flanse
MIHAELA PAUNESCU |
| In this paper are presented the results of an experimental study concerning the determination of the marsit fittings influence on the flow losses of a flanged assembly, used in bulding vessels and pipes under pressure. The used installation allows testin |
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Lubrificatia - element de baza al mentenantei
echipamentelor de proces
Nicoleta Teodorescu |
| The paper presents the process equipment lubrication problem from the maintenance point of view, revealing important aspects like lubricant viscosity in the container and under exploitation conditions, water contamination, and the influence on the wear. T |
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Masuratori de conductivitate si viscozitate pentru solutia apoasa binara de clorura de lisozima si pentru solutia ternara
lisozima-sare-apa
Daniela Buzatu, Emil Petrescu, Carmen Popa, Florin D. Buzatu
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| The conductimetric method, adequate to electrolytes, was used to determine the lysozyme charge in lys-water and ternary lys-salt-water systems. There were also measured the viscosities for the above binary and ternary systems in the same conditions at pH= |
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Metode de separare a ruteniului din catalizatori uzati
IULIU-RADU GABRUS, IOAN BUJOR PANCAN |
It was made a good separation of ruthenium using the extraction method with HCl 18% solution (1:1). From several methods, the extraction method with HCl 18% solution was the best. Ruthenium was extracted from catalysts which had alumina supporter.
Keywo |
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Modelarea tensiunii la bornele unui acumulator
plumb-acid sulfuric
IRINA NITA, OLGA IULIAN, DAN MANDALOPOL |
| In this paper the equations for voltage prediction of a lead-acid accumulator acting as energy storage unit in stand-alone renewable energy systems are presented. An improved equation is proposed. The equation is validated by comparing calculated data wi |
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Noi esteri nesimetrici din clasa 1,4-dihidropiridinelor
cu potentiala actiune biologica
RODICA GUTA, CORINA ILIE, DOINA NANAU-ANDREESCU, MIRON TEODOR CAPROIU,
CONSTANTIN DRAGHICI |
| The paper presents experimental data regarding the synthesis of new 2,5-dimethyl-4-(3-nitrophenyl)-1,4-dihydro-pyridine-3,5-dicrboxilic acids, diester (7a-e). Raw materials in obtaining these new derivatives are the symetrical dimethyl/diethyl esters (3 |
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Procese fizico-chimice care au loc la interactiunea dintre
tesuturile umane vii traumatizate, preparate chimice colagenice
si ultrasunete
Octavian DONTU, Stergios GANATIOS, Mircea COVRIG |
| In this paper there are presented the physical chemical procesess that take place at the interaction between the human derm traumatised as results of burnings and sterile colagenical chemical stuffs with aplications in the non conventional treatment of |
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Sinteza si caracterizarea unor combinatii complexe ale Cu(I) si Cu(II) cu noi tioureide N, N-disubstituite
VERONICA NACEA, RICA BOSCENCU, ALEXANDRU MISSIR, CARMEN LIMBAN,
STEFANIA BARBUCEANU |
The new N,N-substituted phenyl thiourea ligands have been used to prepare copper complexes. The structure of the formed copper complexes was established via physicochemical studies including IR, UV-VIS, ESR spectral measurements.
Keywords: thiourea, c |
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Sinteza si caracterizarea unor complecsi
ai Ni (II) cu dioxime asimetrice alifatice
DANIELA CIRTINA, ION GANESCU |
| This paper presents the preparation of the nickel (II) chelates with asymmetric a-dioximes and the chemical and physico-chemical characterization, with transformation, by IR spectra, TG, DTA, and DTG measurements studies of the thermal behavior of thes |
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Specializarea si catedra echipamente de proces dupa 50 de ani
V. V. Jinescu |
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Studiu privind evolutia parametrilor calitativi din miere in urma decontaminarii prin iradiere
IULIANA BRATU, CECILIA GEORGESCU |
| he aim of this study is to follow the physical-chemical parameters of a good quality honey. These parameters could alter upon radioactive decontamination of honey. This study analysed the evolution of germ contamination in honey and the physical-chemical |
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Studiul reactiilor de cicloaditie 3+2 dipolara a 1,10-fenantroliniu ilidelor la alchene activate
RAMONA DANAC, MIRCEA CONSTANTINESCU, ALEXANDRU ROTARU, ALEXANDRU VLAHOVICI, IGOR CRETESCU, IOAN DRUTA |
| The ability of 1,10-phenanthrolinium phenacylides (as 1,3-dipoles) to react with activated symmetric dipolarophiles is presented. The new heterocyclic system (N-R)-1-(4-X-benzoyl)-1,2,3,3a-tetrahydropyrrolo<1,2-a><1,10>phenanthroline-2,3-dicarboximide wa |
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Studiul starilor de solicitare in zonele de imbinare a invelisurilor sferice cu invelisuri cilindrice
I. Se neglijeaza efectul cordonului de sudura din imbinare
Radu I. IATAN |
| The paper presents the evaluation methods of the strains and deformations in the areas of joining of some spherical shells with cylindrical shells, long or short, which are met in the industrial practice. It is asked for the theory with bending moments. T |
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Unele aspecte privind proiectarea elementelor active ale
masinilor de maruntire cu ciocane articulate
GHEORGHE ENE |
| The paper presents some aspects concerning the calculation of active elements of the impeller impact grinding mill. It is taken into account the correlation of hammer mass with the one of material pieces to be crushed (so that the hit should be at maximum |
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Azocuplarea în pozitia orto, abordarea prin
relatii liniare a mecanismului
AURORA SALLO, CORNELIA CRASMAREANU, ZENO SIMON, STEFAN RADULY
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| The kinetic data for the azocoupling in orto position of substituted benzenediazonium cations to 1-naphthol-4-sulphonic acid (series A) <4,5>, 4-chloro-1-naphthol (series B) and 1-amino-naphthalene-4-sulfonic acid (series C) <6,7> is aqueous solution(seri |
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Biodistributia si activitatea antitumorala a unor derivati ai carboximetilcelulozei
Constantin V. Uglea, Anton Parv, Maria Corjan , Alina D. Dumitriu, Raphael M. Ottenbrite
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| New polymers with antitumor activity were synthesized by introducing ethyl-p-aminobenzoate (benzocaine) or N-hydroxy-2,3-dihydroxybenzamide (didox) onto carboxymethylcellulose (CMC) and oxidized CMC. The biological tests (in vivo and in vitro) proved that |
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Caracteristici spectrale si chemiluminescente ale
unor plante cu rol antidiabetic
ANCA DICU, RODICA SEGAL
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Given the fact that antioxidants play an essential role in the cellular metabolism, this paper work analyses the antioxidant activity and spectral characteristics of some natural tea extracts.
Keywords: plant extracts, flavonoids, chemiluminescence te |
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Caracteristici spectrale si cinetice ale proceselor de îmbatranire naturala si accelerata a pergamentului (II)
Lucretia Miu, Maria Giurginca
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| From ancient times, the parchment was used to produce patrimony objects, mainly books and manuscripts of great value. In order to restore them, we made tests of natural and accelerated ageing (thermo and photooxidative) on parchment samples coming from va |
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Ciclizarea unor noi N1-aroiltiosemicarbazide N4- substituite
LAURA-ILEANA SOCEA, IOANA SARAMET, CERASELA GIRD, BOGDAN DRAGHICI
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| Some new thiosemicarbazides (3a-d) with potential tuberculostatic activity were synthesized using classical procedures. Cyclization of (3a,b) in sodium hidroxide medium afforded the corresponding 1,2,4-triazole-3-thioles (4a,b). Cyclization of (3a-d) in s |
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Comportamentul electrodului de PbO2 aditivat in mediile
acide care contin glucoză sau cisteina
Florica Manea, Joop Schoonman, Ciprian Radovan
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| The behaviour of Co-doped PbO2 electrode in 0.1 M H2SO4 solution containing glucose or cysteine was investigated. The doped lead dioxide electrode was electrodeposited from an electrolytic bath 0.5 M Pb(NO3)2 and 0.5 M Co (NO3)2 in galvanostatic conditio |
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Elaborari de straturi subtiri de TiO2 prin LPCVD si CVI
pentru aplicatii fotocatalitice
Florin-Daniel Duminica, Francis Maury, Diana Costinel
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| This report presents preliminary results of a work aiming the growth of titanium dioxide thin layers by Low-Pressure Chemical Vapour Deposition (LPCVD) and by Chemical Vapour Infiltration (CVI). These TiO2 coatings are grown on glass plates (LPCVD) and on |
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Evaluarea capacitatii antioxidante a unor extracte vegetale conditionate sub forma de geluri
CORNELIA NICHITA
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| The paper presents the chemical-structural characteristics and the assessment of the antioxidative activity of the vegetal extracts and the gel type products obtained with them. The experimental data emphasized the high antioxidative |
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Ftalocianine sulfonate de metale tranzitionale,
catalizatori pentru demercaptanizarea benzinelor
Emilian Angelescu, Anca Cruceanu, Rodica Zavoianu1, Anca Angelescu
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| The paper presents the catalytic activity of Co, Cu, Ni, V, Fe and Mn sulphonated phtalocyanines compared to the catalyst Merox-UOP for the demercaptanization of some gasolines containing ethyl-mercaptan and tert-butyl-mercaptan, respectively. A catalytic |
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Implicarea reologiei în cunoasterea structurii produselor
care contin hidrocarburi cu masa moleculara mare
Nicolae Iutes-Petrescu, Gabriela Iacobescu, Mirela Damian, Teodora IuteS-Petrescu
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| The paper is intended to make a short investigation of the rheological behaviour of bitumen which contains asphaltenes, resins, aromatic and saturate hydrocarbons with high molecular weight. The rheological tests show the non-Newtonian character of flow b |
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Indepartarea contaminantilor organici din ape uzate cu ajutorul argilelor stalpuite
Eveline Popovici, Claudia-Mihaela Hristodor, Maria Alexandroaei, Alina- Mihaela Hanu
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| Romanian clay samples from Valea CChioarului, mixed PILCs, Al/Cu and Al/Fe having molar ratio 1/1 - 3/1, have been studied structurally and adsorptively. There was a preliminary study regarding the use of these samples in the process of polluants remova |
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Influenta unor interferenti din apele naturale asupra dozarii voltametrice a ionului azotit la electrozii de diamant
policristalin conductor
Tanta Spataru, Ana Maria Josceanu, NICOLAE Spătaru
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| Based upon the average composition of some natural waters, the influence of possible interferents (Cl, SO, I, NO, HCO, CO,PO) on the voltammetric determination of nitrite at conductive diamond electrodes was investigated. It was found that the us |
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Metoda de masurare a potentialului de suprafata a membranei de teflon pentru microfoanele cu electreti
OCTAVIAN MIHAI GHITA
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| This paper presents a method for measuring the membrane surface potential for electrets microphones, which are constructed using different varieties of teflon, type polymers like fluoro ethylene propylene (FEP) and per-fluoro-alkoxy (PFA). A polarization |
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Metode de calcul pentru estimarea conductivitatii termice echivalente a unui mediu poros saturat cu fluide
TUDORA CRISTESCU
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| This work presents two methods for the estimation of the equivalent thermal conductivity for a fluid saturated porous medium. First, ideal models are considered, in which the solid medium is assumed to have a certain geometry, and the fluid medium is stat |
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O metoda stoichiometrica pentru determinarea transportului
de apa in membrana schimbatoare de ioni
din reactorul electrochimic
Alexandru Szep, Liliana Lazar, Florin Bandrabur1, Ionita Manea
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| The sodium ion dynamic hydration number value assures the possibilities of calculus for the main indicators of the brine electrolysis reactor with ion exchange membrane (IEMR). For estimating this number, a stoichiometry based method is proposed . Using t |
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Oxidarea anodica si polimerizarea autocatalitica a anilinei
pe diversi electrozi
Ioana MAIOR*, Maria NICOLA
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| The possibility of aniline anodic oxidation and autocatalytic polymerization on different electrodes (Pt, graphite, RuO2, Co3O4) with the formation of aniline black (emeraldine) was investigated. For all these electrodes, the aniline oxidation occurs in t |
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Produsi cu unda scurta discontinua si continuă pentru determinarea multicomponenta a colorantilor Sunset Yellow si Tartrazine în pulberile pentru bauturile nealcoolice
Erdal Dinc , Dumitru Baleanu ,Özgür ÜstündaG, Hassan Y. Aboul-Enein4
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| The multicomponent quantitative resolution of the binary mixtures containing, sunset Yellow (SN) and tartrazine (TR) without any pre-chemical treatment, in the presence of the overlapping signals was accomplished by the simultaneous use of the discrete an |
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Protectia mediului - Modelarea matematica a calitatii apei în sistemul de distributie
a apei potabile
Camelia Gavrila, Gratiela Tarlea
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| The solution of the time-varying water-quality problem is obtained in an event-oriented system-simulation framework. In case when a relatively large number of seps are simultaneously active, a partial aggregation of the seps may be performed (with Gauss f |
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Saruri de 2,6-dialkil-4-metilpiriliu si
de 6-alkil-2,4-dimetilpiriliu, si sarurile corespunzatoare de N-alkilpiridiniu ca lichide ionice noi
Alexandru T. Balaban, Melanie J. Lesko, Ion Ghiviriga, William A. Seitz
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| Many tri- and tetra-alkyl- substituted pyrylium and pyridinium salts having n-alkyl groups with more than three carbon atoms have melting points below 100oC (and in some cases even below room temperature), and thus qualify as ionic liquids. Uses of ionic |
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Sinteza si caracterizarea electrochimica a unor coloranti
1H-3-fenil-6-metil-7-aril-azo-pirazolo<5,1-c><1,2,4>triazolici
Liviu Costea, Vasile-Nicolae Bercean, Valentin Badea, Adrian Chiriac
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| The azoic dyes based upon 1H3-phenyl-6-methyl-7-arilazopyrazolo<5,1-c><1,2,4>triazole were obtained by the coupling of 1H-3-phenyl-6-methylpyrazolo<5,1-c><1,2,4>triazole with various aromatic diazonium salts in alcoholic-alkaline media. The newly synthesi |
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Studii spectrofluorimetrice privind influenta compusilor organofosforici asupra potentialului transmembranar al limfocitelor umane si celulelor tumorale din linia K 562
DANIELA BACONI1, DAN BALALAU1*, MARIA BARCA1, GINA MANDA2, RICA BOSCENCU1
|
Membrane potential controls several functions of both excitable and non-excitable cells. Evidence exists that, in the case of immune cells, membrane potential regulates receptor-mediated intracellular signaling.
We investigated the effects of organophos |
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Transpozitii competitive VI.
Reactia 7-carbetoxi-1,4-dibromodibenzol biciclo <2.2.2>octa-2,5,7-trienei cu bromul
Andreia Bruckner, Ileana Ionica, Constantin Draghici, Petru Filip, Ilie G. Dinulescu
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| The effects of the bridgehead bromine atoms upon the reactivity of the dibenzobicyclo<2.2.2>octatrienic system have been identified thus, bromine addition affords only small amounts of products with a transposed skeleton, the main reaction product being t |
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Trasabilitatea în măsurarea chimica
1. Definitii. Documente de referinta. Elemente si principii
pentru acreditarea laboratoarelor
ION Gh. TANASE*, DANA ELENA ANGHEL, MIHAELA BULEANDRA
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| Traceability is a property of the results of a measurement. The concept of traceability implies that measurement data are linked to stated references, through an unbroken chain of comparisons. This paper discusses how traceability can be conceived in the |
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| Caracteristici reologice ale unor rasini ciclohexanon /p-nonilfenol/ o-crezol formaldehidice |
| Four pimelic ketone/p-nonilphenol/o-cresol/formaldehydic resins synthesized in acidd catalysis were studied from the point of view of their rheologic properties. The study consists of measuring the apparent viscosity, the consistency index, the flow inde |
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| Complecsi cu amestecuri de grupe donoare (OO) si (ONO). II. Sinteza si caracterizarea unor complecsi noi de Ni(II), Pt(II), Cu(II), VO(IV) cu 1-fenil-3metil-4-azo-(2-carboxi-fenil)-pirazol-5-one și alilacetoacetați ca liganzi |
| A new series of the dinuclear coordinative compounds of the cations Ni(II), Pt(II), Cu(II), VO(IV) with mixed ligands 1-phenyl-3-methyl-4-azo-(2 - carboxy-phenyl)-pyrazol-5-one and alylacetoacetate have synthetisized. They have been characterized by elem |
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| Comportarea unor materiale dentare pe baza de cupru in sistemul NaCl - acid oxalic - acid lactic |
| In this paper it was studied the behaviour of three dental biomaterials based on copper (NPG, NPG 2 and Gaudent) in a system which contains components from oral cavity. The three biomaterials were studied using investigations of mass losses of metall |
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| Considerații asupra fragmentării unor azulene 1-substituite în spectrometrul de masă. Partea a II-a |
| The fragmentations of 1-(azulen-1-yl)-phenylethene and 1,2-di-(azulen-1-yl)-ethene were studied and discussed in comparison with those of the azulenic azo derivative and Schiff base and of the 1,2-diphenylethane. At the fragmentation, in all derivatives, |
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Cristale lichide. 8. Studiul experimental al tranzitiei la faza de cristal lichid al unor
amestecuri de mezogeni termotropi prin metoda difuziei luminii
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Two cholesteryl mesogenes derivatives with the same type of liquid phase are mixed under the appropiated condition of temperature and pressure. A liquid phase with the same structure as the starting liquid is observed. A simple analitycal system using |
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| Determinarea experimentala a conductivitatii electrice a unei sticle boro-sodice |
This paper presents the experimental determination of the electrical conductivity, for a sodium diborate glass, with or without copper. It was proved that a high copper content renders a negative influence upon the glass conductivity.
Keywords: ionic co |
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| Determinarea nivelului de impurificare cu plumb si cadmiu a produselor alimentare dulci prin spectrometrie de absorbtie atomica cu atomizare electrotermica |
| This study reports the obtained results regarding the contamination level with lead and cadmium in sweet food samples. Lead and cadmium concentrations were determined by graphite furnace absorption spectrometry using palladium and diacid ammonium phospha |
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| Influenta naturii materiei prime asupra aromatizarii hidrocarburilor C6 pe catalizatori Zn/H-ZSM-5 |
| The structure of the hydrocarbon feed has a marked influence on the catalytic performances in the aromatization of C6 hydrocabons on a Zn/H-ZSM-5 catalyst. In order to prove this fact, a study was carried out, using n-hexane, 2-methylpentane, cyclohexane |
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| Influenta sistemului redox mediator asupra curbelor de polarizare in electrooxidarea mediata a fenolului cu Co3+/2+ |
| The paper presents the polarization curves for the mediated electrochemical oxidation of phenol with Co3+/2+ redox couple at platinum anode in H2SO4 solution. It was studied the effect of the concentration of Co3+/2+ system upon the oxidation potentia |
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| Influenta unor parametri asupra coloanei de copolimerizare cu bule |
| Radical polymerization of acrylic monomers is the most important procedure of obtaining acrylic resins for paints and lacquers. The polymerization process, which take place in a column type reactor is very complex due to the intergrowth of two types of fa |
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| Model matematic pentru simularea sistemului integrat riser-regenerator din instalatia de cracare catalitica |
| An integrated simulator has been developed to simulate the riser and the regenerator of a Fluid Catalytic Cracking process. The simulator integrates a 6-lump kinetic model and plug flow hydrodynamics for riser reactor with Kunii-Levenspiel bubbling-bed |
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| Proprietati spectroelectrochimice ale anionilor-radical chinonici in medii aprotice |
| The paper presents the results obtained following the electrochemical generation of intermediate reactive anion radicals of some succesive reactions chain. The anion radicals, coming from quinone and their derivatives, are electrochemically generated. The |
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| Recuperarea solventilor in procesul de solventare a motorinei |
| The paper presents some aspects concerning the recovery of the solvents in solvent refining of the Diesel-oil. The design of solvent recovery block (from rafinate and extract solution) needs accurate vapor liquid equilibrium data. The systems involved in |
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| Reducerea catalitica selectiva a oxizilor de azot pe un catalizator de tip Ru-MCM-41 |
| This study was aimed at the evaluation, for the first time, of the Ru-MCM-41 catalytic potential, in the reaction of NO selective catalytic reduction with NH3 , in the presence of oxygen in excess.The catalytic activity was assessed by using an integral |
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| Reducerea electrochimica a dinitrogenului la amoniac pe hidroxizi de Fe(II) |
| The Fe(OH)2 activity in the reductive fixation of dinitrogen to ammonia is controversed. The system is, probably, the simplest of all the chemical systems capable of dinitrogen reduction. The reduction mechanism of dinitrogen by the Fen type clusters g |
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| Separarea Pb(II) din sisteme apoase prin flotatie ionica |
Pb(II) is one of the important metallic ions both from the toxicity point of view as concerns human livings and its requirement in different industrial processes. Metal toxicity is closely connected to the chemical type under which this appears in the e |
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| Simularea caracteristicilor tehnice si functionale ale unor biomateriale destinate tehnicii dentare |
| In this paper are studied the technical and functional characteristics (for a period of 2000 exposure hours) of titanium and dental alloy Ti-6Al-4V in solutions that reproduce in vitro the biological environment from the oral cavity (artificial saliva) |
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| Sinteza prin metoda reducerii chimice, microstructura si comportarea magnetica a pulberilor amorfe ultrafine din sistemele (Fe, Co, Ni)-B |
| Amorphous ultra-fine powders in (Fe, Co, Ni)-B binary and ternary systems were elaborated by metal ions reduction from an aqueous solution, by using KBH4. The metallic elements concentration may be controled by changing the metal ions concentration, as we |
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| Structura, tautomeria si fluorescenta unor baze Schiff cu resturi 1,3-dihidro-2H-benzoimidazol-2-tionice |
| The article presents experimental data regarding structure, tautomerism and fluorescence of some azomethine dyes. Molecular orbital calculi are conducted by means of MOPAC-PM3 procedures. The tautomeric composition of Schiff bases was estimated from 13C-N |
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| Studii experimentale si teoretice ale caracterului lipofil al unor coloranti azoici directi |
| This paper presents an experimental assessment of chromatographic RF values of some water - soluble 4, 4ĄŠ- diaminobenzanilide direct azo dyes by Reverse-Phase Thin-Layer Chromatography (RP-TLC). Experimental dye chromatographic mobilities obtained quant |
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| Studiu privind functionarea reactoarelor de amestecare cu elice intubata |
| In the paper it was obtained the analytical solution of the laminar upward flow between two coaxial cylinders and are given clear indications about the movement components of a solid particle: translation, rotation and radial displacement . It is proposed |
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Aducti de oxid azotic ai reductazei azotice citocroma cd1
RADU SILAGHI DUMITRESCU |
| In cytochrome cd1 nitrite reductase (NiR), the heme d1 is the site of nitrite reduction ti nitric oxide. The crystal structure of NiR bound to nitric oxide is available. This complex. for which a formal Fe(III)-NO (6, in Enemark-Feltham notation) ox |
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Aspecte cinetice ale termooxidarii PEJD stabilizata cu vitamine
SILVIU JIPA, TRAIAN ZAHARESCU, LAURA MONICA GORGHIU, CRINELA DUMITRESCU, RADU SETNESCU |
| In this paper the kinetic parameters depicting the thermal stabilisation of low density polyethylene are presented. The background of the thermal protection confered to polymers by vitamins C and E are discussed together with the basic mechanisms through |
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Biosorbtia ionilor metalelor grele de catre speciile Bacillus Licheniformis si Penicilinum
ANICUTA GUZUN-STOICA, AMALIA GHEORGHE, LUIZA JECU, MARTA STROESCU,
TANASE DOBRE
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| Bacillus licheniformis and Penicillium species were used for zinc and uranium ions removal from wastewater. Heavy metals ion tolerance and adaptation of Bacillus licheniformis and Penicillium species to high metal ions concentrations were performed. Batch |
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Caontaminarea malului Marii Negre cu hidrocarburi aromatice policilcice si pesticide organoclorurate
SIMONA DOBRINAS, SEMAGHIUL BIRGHILA, VALENTINA COATU, ANCAIULIA STOICA, GEORGE-EMIL BAIULESCU |
| This study contains the results obtained for the fifteen PAHs and for six pesticides from Black Sea Coast by Gas Chromatography with Mass Spectrometer Detector (GCMS) and by Gas Chromatography with Electron Capture Detector (GCECD), respectively between |
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Contributie la studiul adsorbtiei de schimb ionic
pe minerale argiloase
FLOAREA MANEA |
| This paper work studies a physico-chemical phenomenon that takes places spontaneously during the processes of oil field exploition which use drilling fluids based on clay minerals. The stability and rheological properties of these dispersal systems can ch |
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Determinarea spectrofotometrica
a paladiului din diverse aliaje
IOAN BUJOR PANCAN, RADU IULIU GABRUS |
| In this paper there was applied an organic reactive for the spectrophotometrical determination of Pd(II) from alloys. The dosages were made on four alloys and there were obtained good results even in the presence of silver, gold, platinum, iridium and rho |
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Efecte contraionice asociate genezei structurilor supramoleculare formate prin polarizarea electrozilor
GHEORGHE SEMENESCU |
| The careful analysis of the background noise, in powertime recordings, offers arguments regarding the presence of contra-ionic effects in the space of the polarized electrode, as a support of the concept of structuring the interlelectrode space, in acco |
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Fragmentarea virtuala a moleculelor si evaluarea similaritatilor
LASZLO TARKO |
| It is proposed a computer-assisted procedure for the fragmentation of molecules based on two ideas: a) two heavy atoms, bonded by a chemical bond with bond order B, are part of the same fragment if the bond order B is larger than a certain limit value; b |
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Informatii spectrale UV-VIS despre complecsii PL (II) si Pd(II) cu piridina 2-carboxialdehida-tiosemicarbazona si corelarea lor cu efectele antineoplastice si citogenice
COSTEL SARBU, CRISTINA VIJDELUC, MAVROUDIS A. DEMERTZIS, DIMITRA KOVALA-DEMERTZI
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| In principle, QSAR describe how the molecular structure, in terms of descriptors lipophilic, electronic and steric affects the chemical or biological activity of a compound. In this regard the UV-VIS spectra appear of a real interest considering their |
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Instabilitati ale celulelor biologice induse de generarea unor substante ionice in interiorul acestora
BENEDICT OPRESCU, CARMEN TOPALA |
| It was investigated the dynamic behaviour of biological cells through a system of first-order linear differential equations in terms of passive microtransport. The cellular behaviour is a function of system parameters and the concentration of ions is the |
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Modelarea conformationala a unor noi compusi porfirinici
si complecsii acestora cu Zn(II) si Cu(II)
Anticiparea tranzitiilor electronice care apar in spectrele
de absorbtie UV-Vizibil
RICA BOSCENCU, DUMITRU LICSANDRU, VERONICA NACEA, DUMITRU NEGO |
| A conformational study of a series of three new porphyrinic compounds: 5-(4-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-H-porphine (TPPOHP),5-(3-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-H-porphine (TPPOHM), 5-(2-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-H- |
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Noi derivati acridinici 9-substituiti cu opotentiala activitate antitumorala
CERASELLA AFLOROAEI, MIRCEA VLASSA, IOAN PANEA |
The synthesis of new 9-substituted acridine derivatives with possible antitumor activity is described.
Keywords: 9-substituted derivatives of acridine, amidic acids, isoimide, cyclic hydrazine.
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O noua sinteza directa a 1-fenilpirazolidin-3-onelor. II
GEORGE IULIU MARTON, ANCA LIANA MARTON |
| Effects of ultrasounds and microwaves on the one-pot synthesis of 1-phenylpyrazolidin-3-ones were studied, and proofs of the mechanism of the synthesis involving ketene intermediates were sought. Side products were also investigated and a mechanism to exp |
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Obținerea g-undecalactonei optic active prin procedeul bioconversiei microbiene
MONICA MATEESCU, ION TRANDAFIR, MANUELA PETRESCU, LIVIU CHIRIGIU |
| The microbiological process is useful for the production of an optically active gamma lactone, from an organic carboxylic acid. The microbiological reduction of - keto-group described rise to -undecalactone isomers having high optical purity. These condit |
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Obtinerea retinalului prin oxidarea retinolului cu BaMnO4
HORIA ALBU, AIDA UZUNU, PETRONELA MATEI |
| This paper describes a new method for retinol oxidation in order to obtain retinal in high yield. The major advantage of oxidation with BaMnO4 is retaining the configuration in case of 11-cis retinol to the corresponding 11-cis retinal. The method describ |
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Optimizarea pregatirii probelor pentru analiza HPLC
a unor pesticide organoclorurate din apa potabila
CLAUDIU BRUMARU, GABRIELA PAPOE, ALFA XENIA LUPEA |
| The study shows the significant influence of sample preparation step over the sensibility and recovery of target analyts in a HPLC method developed for quantification of five organochlorine pesticides from drinking water samples. There were performed ex |
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Sinteza si caracterizarea combinatiilor complexe
ale Co(II), Ni(II) si Hg(II) cu liganzi de tipul
N1-aroil-N4-alchiltiosemicarbazida
STEFANIA BARBUCEANU, LAURA ALMAJAN, TUDOR ROSU, MARIA NEGOIU |
Co(Ii), Ni(Ii) And Hg(Ii) complexes of N1-<4-(4x-phenylsulfonyl)-benzoyl>-N4-buthyl-thiosemicarbazide (X=H, Cl) have been prepared and characterized by elemental and thermal analyses, Uv-Vis and Ir data.
Keywords: Co(II), Ni(II), Hg(II) complexes, N1-a |
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Studii ATR FT-IR asupra complecsilor metalici cu nicotiamide tranzitionale
TUNDE JURCA, SIMONA CAVALU, LAURA VICAS, GRIGORE DAMIAN, FLORIN BANICA |
| The spectroscopic characterization of new synthesized complexes of copper (II), mercury(II) and cadmium(II) containing nicotinamide (3- pyridine carboxylic acid amide) are reported (nic=nicotinamide). The complexes appear to be tetradentate coordination o |
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Studiul depunerii electrochimice a
acoperirii compozite Cu/CeO2 din electroliti acizi
OLGA MITOSERIU, CATaLINA ITICESCU, GETA CARAC |
| There were studied the composite coatings in the copper matrix using the cerium oxide as dispersed phase. The effects of the current density in the codeposition of the cerium oxide in the composite coatings were investigated. The experimental data confirm |
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Substante higroscopice si delicvescente componente ale aditivilor de reducere a continutului de aerosoli
DANIELA POPOVICI, OCTAV PANTEA, NICULAE NAPOLEON ANTONESCU, VASILE MATEI, EVA TRIMBITASU, DORIN BOMBOS |
| This paper presents a study of water-carry efficiency by the hygroscopic and deliquescent compounds, in the aim of utilization of these compounds as components of some additive for reduction of aerosol content. It has been study qualitatively and quantita |
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Utilizarea tehnicii chemiluminescentei pentru evaluarea stabilitatii unor uleiuri minerale si vegetale protejate de antioxidanti
NICOLETA IFTIMIE, J. M. HERDAN, MARIA GIURGINCA, AURELIA MEGHEA |
| For the evaluation of the stability after long time depositary or thermooxidative aging of mineral or vegetable oils, some specific or standard techniques are used such as spectral, colorimetric methods and oxygen absorption. This paper aims to use chemi |
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Volumele molare de exces ale amestecurilor binare lichide
de 1-butanol cu n-heptan sau n-octan
VASILE DUMITRESCU, EVA TRAMBITASU, RODICA VILCU |
| This paper presents excess molar volumes, VE, for binary mixtures of butanol (n-C4H9OH) + heptane (n-C7H16) and + octane (n-C8H18) at 288.15 K, 293.15 K, 298.15 K, 303.15 K and 308.15 K. VE has been found to be positive over the entire composition range f |
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ALEXANDRU IOAN CHIVULESCU, ANDREI FLORIN DANET, SLAWOMIR KALINOWSKI
Determinarea peroxidului de hidrogen si a ampicilinei folosind o metoda de analiza cu injectare in flux cu
detectie prin chemiluminescenta
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| A new flow injection analysis assembly for the chemiluminescence determination of hydrogen peroxide and ampicillin was developed. Optimal parameters of the system were determined (luminol solution concentration, Na2CO3 solution concentration, K3 |
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ANDREA KELLENBERGER, NICOLAE VASZILCSIN
Determinarea factorului de rugozitate al electrozilor pe baza de nichel scheletat prin voltametrie ciclica |
| The roughness factor of skeleton nickel electrodes was calculated from the charge associated with the oxidation of the nickel electrode surface to a monolayer of nickel hydroxide. Cyclic voltammograms were recorded in 1 mol L-1 NaOH solution, in the poten |
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CALIN CRISTIAN CORMOS, SERBAN PAUL AGACHI
Modelarea si simularea extractiei pantolactonei
folosind programul ChemCAD |
| In this paper the mathematical model and the simulation for the extraction process of racemic pantolactone (an intermediary product in the synthesis of calcium pantothenate) have been described. The aqueous solution of racemic pantolactone resulted from t |
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CECILIA GEORGESCU, IULIANA BRATU, MIRCEA TAMAS
Studiul unor polifenoli din Rhododendron kotschyi |
| Caffeic acid derivatives were qualitatively and quantitatively analysed from the flowers and leaves of Rhododendron kotschyi. Total amount of polyfenol of caffeic acid type is 0.1175 mg caffeic acid from leaves and 0.1450 mg acid caffeic from flowers. Qua |
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CORNEL PATRASCU, GHEORGHE BREBEANU, LOREDANA IRENA DOBRE, MARIA POPA
Analiza relatiilor dintre viteza de migrare a poluantilor petrolieri lichizi in sol, proprietatile solului
si compozitia poluantilor |
| The paper presents the correlations between movement velocity of pollutants into soils versus soils and liquids properties. The information acquired in the laboratory with experimental equipments using varied sorts of soils water and oil liquid pollutant |
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CRISTIANA RADULESCU, ANA-MARIA HOSSU
Noi acizi dicarboxilici dichinoxalin-piperazinici alchilati obtinuti prin sinteza |
| In this work two original alkytated heterocyclic systems were analyzed by spectral analysis, UV-VIS, IR and NMR spectroscopy for the confirming of their proposed structures. Also, these systems were purified and separated by TLC and HPLC methods. The stru |
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DORINA MATEI, ANCA BORCEA, VASILE MATEI
Studiul interconversiei unor olefine pe catalizatori sulfuri si oxizi micsti suportati |
| This paper presents the experimental study of catalytical behavior of binary catalytic systems transitional metals (VI, VIII groups) sulfur salts and oxides in olefins (propylene) inter-conversion reactions. The catalytic systems were: NiOMoO3/Al2O3, N |
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FELICIA DRAGAN, SIMONA BUNGAU, ADRIANA MOLDOVAN
Sinteza si analiza complecsilor de asociatie ionica ai atenololului |
| There were synthetised three ionic association compounds that are formed by atenolol with heteropoliacids (Reinecke salts, phosphomolybdic acid and phosphotungstic acid). The obtained complexes were elementally analysed, it was established their forming w |
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FRANCISC POTMISCHIL
Corelatii lineare intre deplasarile chimice 13C RMN ale azaciclo- si azapolicicloalcanilor si ale analogilor lor carbociclici |
| Simple linear correlations were determined between the 13C NMR chemical shifts of azacyclo- and azapolycycloalkanes of various ring sizes, with either secondary or tertiary amino groups, and the chemical shifts of the corresponding cyclo- and polycycloalk |
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GRATIELA ZGIRIAN, IOANA DEMETRESCU, HORIA GHEORGHIU, HORIA IOVU,
ANTON HADAR, COSTICA ATANASIU
Modelarea unor compozite polimerice: de la sinteza la proprietati mecanice si calcule cu elemente finite |
| The experimental part of the paper involves mechanical properties evaluation as a function of thickness of the material and the influence of reinforcing agent percent. This study is an application of a finite element method to a kind of composite material |
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IULIA CONTINEANU, LOREDANA CHIVU, STEFAN PERISANU
Entalpia de formare a acidului 2-cheto-glutaric
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| The energy of combustion of 2-keto-glutaric acid was measured by bomb calorimetry (-1796.25 ± 4.14 kJ.mol-1). The fusion enthalpy was obtained by means of DSC (28.59 kJ.mol-1) and the enthalpies of formation in solid and liquid states were de |
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LOREDANA ELENA VIJAN
Studiul interactiei cromomicinei A3 cu ADN
prin spectroscopie de absorbtie |
| Many anticancer drugs are known to interact with DNA to exert biological activities. There are several classes of DNA-acting antitumor drugs. Among these classes of DNA-acting antitumor drugs are the drugs that bind to the minor groove of DNA, such as chr |
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LUOANA PASCU
Stabilirea calitatii vinurilor rosii pe baza
caracteristicilor cromatice |
| In this paper it is proposed a graphical method of determination and are presented a nd discussed the obtained results concerning the determination of the main chromatic characteristics of some red wines of Drăgășani - Vâlcea vineyard at different times o |
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MIHAELA GABRIELA BITA, MIRCEA PREDA
Cinetica oxidarii lipidelor din cafea |
| The kinetics of lipid oxidation in Arabica coffee roasted at a temperature of 220°C to achieve a light roasting degree was studied. Rancidity of oil samples extracted from roasted coffee were controlled by the analysis of the peroxide values at 30 day int |
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MIHAELA GHELMEZ (DUMITRU), ELENA SLAVNICU, DAN SLAVNICU, CRISTIAN TOMA,
ANDREEA RODICA STERIAN
Studii despre influenta laserelor asupra acizilor grasi iradiati in stare de cristal lichid
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| In this paper, there are presented experimental and computer studies of systems of fatty acids with a mesomorphic behavior, useful for modelling a simple biological membrane. Samples prepared in own laboratory evidenced a nonlinear optical dependence of |
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MIRCEA OLTEANU, VIOREL-PUIU PAUN, MIHAI TANASE
Analiza seriilor temporale asociate microfractografiilor SEM a Zircaloy-4 |
| In this paper there are studied SEM microfractographies of Zircaloy-4 by using the time-series method. It is first developed a computer application which associates to each SEM microfractography a time series. Then there are used the phase space embeddi |
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MONICA NADASAN, OVIDIU IANCU
Obtinerea si caracterizarea cristalelor fotonice prin litografie cu raze X |
| A method for obtaining two- and three-dimensional photonic band gap crystals is described. The procedure consists in the deep X-ray lithography and laser and sintered pre-ceramic precursor (polyvinylsiloxane). Thus, photonic structures with full band-gap |
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MONICA PUSTIANU, MIRCEA-SORIN BUCUR
Corelatia dintre remisia vopsirii si concentratia colorantilor in cazul sistemului tinctorial lana-coloranti acizi |
| In this paper is presented a study of the relations between the colorants concentration for wool dyeing with acid colorants. Dyeings with two acid colorants on 100% wool texture, for six concentrations were performed. The remission curves were drawn for |
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SILVIU JIPA, ION MIHALCEA, WILHELM KAPPEL2, TRAIAN ZAHARESCU, RADU SETNESCU
Lioluminescenta unor halogenuri alcaline iradiate cu radiatii ionizante |
| In this paper the recombination kinetics of lattice defects promoted by gamma irradiation in some halides (NaCl, KCl, KI and KBr) are analysed. The emission of lyoluminescence was used for the monitoring of the transfer of ions from solid state into water |
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TUDORA CRISTESCU
Cercetari privind compozitia reziduului solid obtinut din distilarea petrolului extras dupa aplicarea
combustiei subterane |
| Essentially, the oil exploitation by in situ combustion is based on chemical reactions that take place in the reservoirs. This work presents results on the spectral analysis and structural analysis with X-rays perfomed on the solid residues obtained by th |
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VALENTINA UIVAROSI, CRINA MARIA MONCIU
Determinarea gravimetrica si spectrofotometrica a ofloxacinei utilizand reineckatul de amoniu |
| Ofloxacin forms with ammonium reineckate an 1:1 ion-association complex, having the following formula: +-.The complex is slightly soluble in water and of a pink-purple colour. The obtained complex was described by spectral (IR |
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VIOLETA TUDOR, ADRIANA GHEORGHE, NICOLAE STANICA, MARIA PLAVETI, MARIA BREZEANU
Sinteza si caracterizarea unor combinatii complexe heteroleptice ale Co(II) si Ni(II) cu fenilhidrazina si anioni acetat |
| A three new acetato-hydrazido Co(II) and Ni(II) complexes have been synthesized. IR spectra of these compounds relieved the acetate anion coordination as monodentate, bidentate or bridge and a terminal one for phenylhydrazine. The complex |
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Adsorbtia substantelor humice pe adsorbanti minerali
Vasile Rusu, Alexei Maftuleac, Aliona Vrîncian, Tudor Lupacu
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| The adsorption properties of natural mineral adsorbents of Republic Moldova - diatomit, tripolit and bentonite in relation to humic substances are investigated, the aim being usage of sorbents for practical purposes, in particular for optimization of tech |
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Aspecte privind piroliza amestecurilor formate din deseuri de anvelope si ambalaje PET
Tanase Dobre, Oana-cristina Pavulescu, Gustav Iavorschi, Iulian Dobrea
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| The pyrolysis of a mixture from waste tires rubber and PET particles in a fixed bed with a carbon dioxide flow was performed. The wall heating rate, the carbon dioxide flow rate, the waste rubber particle dimensions and the PET mass fraction, as fundament |
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Cercetari privind determinarea spectrometrica a Pd(II)
cu dioxime asimetrice
DANIELA CIRTANA, ION GANESCU
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| In the present work spectrometric methods for determining the palladium with aliphatic asymmetric dioximes, namely the methyl-ethyl-dioxime, respectively methyl-isopropyl-dioxime are shown. The accuracy of these methods was proved with statical data. Th |
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Cinetica reactiei de transesterificare a uleiului de floarea soarelui
Emil Stepan, Sanda Velea, CRISTINA Enascuta, George Iuliu Marton, Cristiana Luminita Gijiu
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| The aim of the work was to investigate kinetics of sun flower oil with methyl alcohol (5,16 rapport molar methanol/oil) in the presence of potassium hydroxide (0,4 % wt) at 4,12 and 20 0C. The variations in mixing intensity (Re = 650, 920 and 1170) were |
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Coloranti azoici de dispersie pentru cristale lichide
NICOLETA IOICA SLAVILA, STELIANA TUDOR, ION SEBE
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| The paper presents the synthesis of some triazoic dyes through the diazotation method of para-nitroaniline and the coupling with cresidine, the reduction with NaSH, the tetraazotation monoazoic dyes obtained and their coupling with m-cresol, o-cresol, p |
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Corelatii structura-activitate antioxidanta
a unor polifenoli de origine vegetala
Lucia PIRVU, Cornelia NICHITA, Maria GIURGINCA, Aurelia MEGHEA
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| High therapeutical potential and the continuous discovery of new natural polyphenolic compounds made that, one of the actually scientific concern to emphasize the correlation between chemical structure of these compounds and their biologic activity, espe |
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Degradarea fotochimica a riboflavinei utilizata
ca medicament in terapia fotodinamica
Rodica-Mariana ION, Alexandru-Marcel IONITA, Benone CARSTOCEA
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| A study of the effect of light on photodegradation reactions of riboflavin (RF) solutions in the presence of phosphate buffer has been made in this paper. Photodegradation is facilitated by UV radiation and yields to lumichrome (LC) and lumiflavin (LF). S |
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Influenta polivinilpirolidonei
asupra complexelor de furosemid cu beta-ciclodextrin metilat aleator
Codruta Soica, ÁRPAD Gyéresi, ZOLTAN Aigner, MIHALY Kata, Cristina Dehelean
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| The combined effect of randomly-methylated-â-cyclodextrin (RAMEB) and polyvinylpyrrolidone (PVP) on the solubility of furosemide (FS) was studied. Different molar ratios (1:1, 1:2) and various preparation methods (physical mixing, kneading, ultrasonicatio |
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Limite inferioare de explozie, puncte inferioare
de explozie si puncte de inflamabilitate pentru amestecuri de n-octanol si acetat de amil
Maria Mitu, Elisabeth Brandes, Dieter Pawel
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| Characteristic safety data are the basis for all measures in explosion prevention, for avoiding of explosive atmospheres, for classification of hazardous areas and measures associated with this, for classification of flammable liquids regarding the handl |
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Metode de inteligenta artificiala în estimarea concentratiilor de poluant
CALIN I. ANGHEL
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| Today, air quality parameters monitoring and forecasting are important topics of atmospheric and environmental risk assessment. Based on recent achievements in the field of artificial intelligence, new computational techniques were designed for solving ai |
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Modelarea fenomenului de dispersie a dioxidului de azot în atmosfera prin metode statistice
Harieta Pîrlea, Dana Silaghi-Perju, Delia Perju, Carmen Rusnac
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| Allowing that soon Romania will adhere to the European Union, the legislation regarding the environmental protection must be adapted to the demands and standards of the European states. In this case, the studies and researches regarding the pollution prob |
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Modelarea solubilitatii CO2 in apa pura si
solutii apoase de electroliti
Constatin Marin, Constantin Patroescu
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| A semiempirical model is presented which is used to calculate the effect of temperature and pressure on carbon dioxide solubility in pure water and various aqueous electrolyte systems. The model was developed by using of the modern definition of the Henry |
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N,N-disuccinimidilcarbonatul, un potential reactiv in sinteza organica fina de carbonati nesimetrici reactivi, utilizati la protejarea grupelor amino din aminoacizi in vederea sintezei de peptide
ADINA SEGNEANU, MARIUS MILEA, BENIAMIN PINTEA, MONIKA |
| Carbamate-type amino protecting groups constitute by far the most important amino protecting groups and the benzyloxycarbonyl derivates are pre-eminent among these. One of the most important properties of the benzyloxycarbonyl group is the resistance it c |
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Noi faze stationare chelatizante pe baza de lana
in care s-au fixat reactivi organici
Luminita VLADESCU, Irinel Adriana BADEA , Mihaela COSTACHE
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| Stable chelating materials were prepared as they were based on bleached wool loaded with 3 organic reagents. The sorption capacity of the bleached wool for each organic reagent and the stability of the new material in acidic solutions have been establishe |
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Procese corosive in solutii de clorura de potasiu în prezenta hidrogenului sulfurat
MARIA MORARU, ALEXANDRA SCHIOPESCU1, MARIA NEGOIU
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The corrosion of steel in KCl solutions at pH = 11, at different values temperature in presence H2S has been investigated. The corrosion rates have been calculated by weight loss measurement; electrochemical data have been reported.
Keywords: corrosion |
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Radioliza cromatului de plumb impurificat cu oxid de crom
MIHAI Contineanu, Ana Neacsu
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| An EPR study of the paramagnetic centers formed by gamma irradiation of polycrystalline PbCrO4 was made. In the EPR spectra of the gamma irradiated powder sample at room temperature, the presence of three types of paramagnetic centers was observed (Cr4, C |
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Reducerea continuturilor componentelor organice,
a molibdenului si a silicei coloidale din eluatii
uraniferi clorosodici
GHEORGHE FILIP, CRISTIAN PREDESCU, DORIN GHEORGHE FILIP, EUGENIA PANTURU, ROZALIA RADULESCU
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| In this paper, the experimental results obtained at a laboratory facility for molybdenum, silica and organic substances removal from sodium chloride uraniferous eluate solutions are presented. The aim of this study is to obtain uranium yellowcakes having |
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Retinerea cuprului si cobaltului din sisteme apoase diluate
prin procese de biosorbtie
Nicoleta Radu, Elena Bondar, Aurelia Meghea, Ileana Rau
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| Biological waste resulted from different processes (pharmaceutical technology biosynthesis route, food industry etc.) can be reused as biosorbent material in order to improv the quality of industrial wastewater. The results concerning the removal of heav |
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Retinerea ionilor de UO22+ din ape reziduale
simulate pe argile stalpuite din Romania
EVELINI POPOVICI, DOINA HUMELNICU, CLAUDIA HRISTODOR
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| The aim of the present study is to investigate the removal of UO22+ ions, at room temperature, onto different types of Romanian clays: raw and modified Al-pillared samples, in order to determine their potential uses. The results indicate that the adsorpt |
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Saruri complexe ale anionului oxotetrabromomolibdat (V). 1. Combinatii complexe cu derivati de piridazona
HARITINA CHIVU, BEATRICE CALMUSCHI-CULA, NICOLAE STANICA, OLIMPIA MICU, CORNELIA GURAN
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| Our current interest is focused on the preparing novel molybdenum(V) complexes, LH where L was pyridazone derivatives: 6-p-tolyl-2H -pyridazin-3-one L1, 6-(4-chloro-phenyl)-2H-pyridazin-3-one L2 and 6-(4-bromo-phenyl)-2H-pyridazin-3-one -L3 |
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Statistica si compensarea erorilor de masurare in evaluarea
radioactivitatii deseurilor cu solventi organici
Magdalena Dianu, Corneliu Podina, Traian Zaharescu
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| The organic solvent-waste samples were counted in a 2100 TRI-CARB Packard model liquid scintillation analyzer using the Ultima Gold F scintillation liquid cocktail. Nine large sample/cocktail plastic vials were prepared. A homogeneous emulsion sample-c |
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Studiul modificarilor
compozitionale în cocarbonizarea reziduurilor de cracare catalitica si distilare în vid
Guo Yansheng, Chen Lili, Zha Qingfang, Gheorghe Brebeanu, Cristina Dusescu, Paul Rosca
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| Co-carbonization of vacuum residua with FCC slurry was carried out at different reaction conditions and HS, TS, PS, PI of resultants were determined. The HS and TS components of reactants having co-carbonized for one hour were investigated by 1H-NMR and t |
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Valuri ultrasonice in masa
si de suprafata generate de solide metalice prin surse sub forma de impuls
Mihaela Ghelmez (Dumitru), Bogdan Lazar, Cristian Toma, Bogdan Dumitru, Elena Slavnicu
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| In this paper, the profile of surface and bulk ultrasonic waves, generated by pulse shaped sources acting on the separation surface between a metallic and a fluid media, is analyzed. In contact with a gas or liquid, a short excitation of high frequency in |
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Viscozitatea si densitatea
sistemelor binare si ternare cu apa, 1,4-dioxan si DEG la 303,15K
Marinela Catrinciuc, Olga Iulian, Ligia Maria Omota, Oana Ciocirlan
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| Two important properties of the liquid mixtures (viscosity and density) were measured for a water+1,4-dioxane+diethylene glycol ternary mixture as well as for the three corresponding binaries: water+1,4-dioxane, water+diethylene glycol, and 1,4-dioxane+di |
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| Actiunea inhibitoare a unor derivati ai tiosemicarbazidei asupra coroziunii otelului carbon in solutie H2SO4 1N |
The inhibition effect of some thiosemicarbazides on carbon steel corrosion in H2SO4 1N solution has been gravimetrically and potentiostatically determined.
For a concentration of 10-4 M, the tested substances produced a diminution of the corrosion ra |
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Amestecuri ale anhidridelor cu acizi poliamino-policarbixilici si aminoacizi ca agenti
de ignifugare si biostimulatori
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| This work presents the synthesis of mixed anhydrides of polyamino-polycarboxylic acids, amino acids and phosphoric acid which were tested with good results as fire retardants for cotton and paper and as biostimulating agents for mono- and dicotyledonous. |
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| Analiza cantitativa a aditivilor din lubrifianti |
| Infrared spectra of additives or packages of additives are collected on Nicolet FTIR spectrometer using ATR (Attenuated Total Reflectance) technique. The spectra are selected and organized as a library, which permits a further qualitative or quantitative |
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| Aspecte ale coroziunii otelurilor in solutii de electroliti |
| This paper studies some aspects of the corrosion of G105 and P105 steel, utilized in manufacturing drilling steels, in NaCl and KCl solutions, electrolites used in preparing inhibitory drilling fluids. The corrosion speeds were statically |
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| Comportarea la coroziune a otelului slab aliat in medii de etilenglicol-acid formic |
| The behaviour of three alloys of iron with variable carbon content (from 0.2 to 0.4%) is studied in medium of ethylene glycol - 8% formic acid with water concentration varying between 2% to 10%. The weight losses are measured; also the polarisation anodic |
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| Cristale lichide.7. Comportamentul mezogen in seriile unor steril-carboxilati |
| Derivatives of cholesteryl carboxylates with different length of methylene linkages were synthesized. The experimental DSC and observed using the Böetius thermomicroscopy data were analysed and applied to calculate thermodynamic tranzition functions (DtrH |
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| Cuplarea 1H-3-fenil-6-metilpirazolo-<3,2-c>-s-triazolului cu clorura de fenildiazoniu |
| The coupling of the 1H-3-phenyl-6-methyl-pyrazolo-<3,2-c>-s-triazole and of the 7H-1(5)-acetyl-3-phenyl-6-methyl-pyrazolo<3,2-c>-s-triazoles with phenyl diazonium chloride may result in the obtainin gof 1H-3-phenyl-6-methyl-7-phenyl-azo-pyrazolo-<3,2-c>- |
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| Determinarea voltametrica a unor ioni metalici - Cu (II), Pb (II), Zn(II), Cd(II) - folosind electrozi modificati cu politiofen |
| Studies were carried out on the fabrication of glassy carbon (GC), platinum (Pt) and gold (Au) electrodes modified with polythiophene (PT) by cyclic voltammetry, applying a potential from 0,500 to +1,900V vs. SCE at a scan rate of 50 mV/s in 0,1M thioph |
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| Hidroxipiperidinoacetanilide |
| The reaction of substituted chloroacetanilides with 3- or 4-hydroxipiridine was studied and hydroxyacetanilides were obtained in different working conditions. These compounds were isolated, purified and characterized. Pharmacological tests proved that on |
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| Influenta compozitiei filmelor de PbS asupra fotosensibilitatii |
| The paper approaches problems regarding the influence of the composition and structure on the properties of PbS thin films. Films with high photosensitivity are obtained from solutions containing oxidants, reducing agents or by treating the obtained films |
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| Metodă radiochimica pentru investigarea procesului de coroziune in medii agresive |
| The paper presents a study on the corrosion process of some steel samples of H-12, W-3355, and W-2365 type, immersed in acid media: HCl, HClO4, H2SO4 and HNO3, using a method based on radioactive indicators. It was calculated the global constant o |
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| Pertractia selectiva a acizilor carboxilici obtinuti prin fermentatia citrica. Separarea acizilor succinic si malic |
| Pertraction through liquid membranes is one of the most recent liquid-liquid extraction techniques that could be applied for biosynthetic compounds separation. In this paper, the facilitated pertraction has been used for succinic and malic acids separatio |
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| Planul de afacere: o necesitate pentru orice intreprinzator? |
| Planning plays an important role in determining the success realized by a new or small business. A business plan is an effective tool used by businesses to organize these goals and objectives into a coherent format. No matter the size or stage of developm |
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| Reducerea cuprului in sticlele boro-sodice |
The paper presents the results of a study on the copper ruby glass where there is followed the influence of an organic reductant on the reduction-oxidation processes of Cu2O and CuO in a model glass belonging to the Na2O-B2O3 system.
Keywords: glass, |
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| Reducerea electrochimica a acetonei pe electrod de zinc modificat cu derivati porfirinici |
The electrochemical reduction of acetone on modified zinc electrode with some porphyrins derivatives has been performed. The electrocatalytic activity for all porphyrine derivatives have been established.
Keywords:electrochemical reduction, modified zin |
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| Stabilitatea filmelor pasive pe biomateriale pe baza de titan, in ser fiziologic si solutii Ringer |
| The study examines the stability of the passive films on titanium and its implant alloys Ti-6Al-4V, Ti-5Al-2.5Fe, in two physiological solutions (0.9% NaCl and Ringer solutions of different pHs). Recording of the anodic polarisation curves was made with |
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| Studiu comparativ privind utilizarea metodei sol-gel si a altor metode in sinteza unor compusi oxidici |
| The paper presents a comparative study regarding the advantages and characteristics of the sol-gel method by comparison with other methods used in the synthesis of some oxide compounds in the systems: MO-TiO2 and MO-SiO2 ( M2+ = Co2+, Zn2+), MO-R2O3 (M2 |
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| Studiu privind calitatile hidroizolante ale unor materiale solide prin determinari ale tensiunii superficiale |
| The study of the contact between a liquid and a solid surface and the behavior of some materials in contact with different liquids has a big practical interest, because this behavior can affect the whole system where the material is used. The study can b |
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| Studiul cristalografic al compusilor coordinativi ai TlCl3 cu nicotinamida si izonicotinamida |
| Crystal structure of TlCl3 complexes with nicotinamide and isonicotinamide are reported. The coordination geometry of thallium atom is a distorted octahedron, , in the complex with nicotinamide and distorted trigonal bipyramide , , in th |
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| Studiul influentei continutului de alumina asupra distributiei impuritatilor cu continut de vanadiu in amestecuri criolit-alumina |
| The influence of alumina on the distribution of vanadium impurities in cryolite-alumina melts was studied in laboratory scale tests. Cryolite-based baths were impurified with vanadium (added as V2O5). Mixtures have been melted in a graphite crucible tog |
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| Studiul procesului de regenerare a uleiurilor uzate |
| A process for re-refining waste lubricating oils by extraction with organic solvent, in presence of a solid adsorbent is proposed. The solvent dissolves base oil and the solid adsorbent retains major part of liquid impurities. In this paper are compared |
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Analiza compusilor volatili si semivolatili din florile
de Paulownia tomentosa prin gazcromatografie cuplata cu spectrometria de masa
ELIZA OPREA, VALERIA RADULESCU, SILVIA CHILIMENT |
| This paper presents the results concerning the chemical composition investigation of essential oil of Paulownia tomentosa flowers. Separation of essential oil from the flowers was conducted by steam distillation. The quantity of essential oil resulted bei |
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Analiza spectrală RMN a unui nou complex meso-porfirinic nesimetric substituit al Zn(II)
RICA BOSCENCU, VERONICA NACEA, DUMITRU LICSANDRU |
In this work was presented the results of structure study about a new complex combination 5-(4-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-Zn(II)-porphine compound with potential PDT activity. The results was obtained from NMR spectroscopy.
Keywords: po |
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Aplicatii analitice ale dioximelor asimetrice alchil-arilice
Determinarea Ni(II)
DANIELA CIRTINA, ION GANESCU |
| The Ni(II) complexes with the asymmetric a-dioximes were prepared and used for the spectrometric determination of nickel. The statistical interpretation of the experimental data certify the methods of this work are accurate enough and reproductible for |
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Cercetări privind obtinerea filamentelor de carbon
DANIELA BRATESCU, GHEORGHE HUBCA |
| The paper deals with the synthesis of carbon nanotubes by the catalytic decomposition of ethene, hexane and airplane gasoline (JP-8). Four catalytic systems were set up and the optimal parameters of the syn |
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Contributii la studiul cineticii de oxidare in apa
a sulfurii de molibden
LIANA MARIA VLADUTIU
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| The kinetics of oxidative leaching of molybdenum sulphide in water was studied in the temperature range 150-2200C at the oxygen partial pressure of 5-25 range. The rate of oxidation reaction is described by an expresion were:represents the oxidation rat |
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Culoarea si comportarea tinctoriala a unor coloranti reactivi vinilsulfonici - derivati ai esterului monosulfuric al
2-(4-amino-benzensulfonil)-etanolului
MONICA ELENA LUNGU, VALENTIN RADITOIU, LUMINITA WAGNER, ALINA RADITOIU, CONSTANTIN ALIFANTI, CORN |
| A series of reactive dyes have been studied after being are applied to cotton and their properties evaluated. The effect on colour fastness caused by incorporating different groups into the structure of reactive dyes has been investigated. The colour fast |
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Degradarea electrochimica a clorofenolilor prin oxidare anodica
in prezenta de H2O2 electrogenerata
CRISTIAN PIRVU, ENRIC BRILLAS, OCTAVIAN RADOVICI, ALEXANDRA BANU |
| The degradation of 4-chlorophenol, 2,4-diclorophenol and 2,4,5-trichlorophenol in 0.05M Na2SO4 of pH 3.5 has been studied by anodic oxidation in the presence of electrogenerated H2O2 using a Pt anode and an O2-diffusion cathode. A general reaction path |
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Determinarea unor poluanti organici si anorganici in vin
ELISABETA CHIRILĂ, SIMONA DOBRINAS, VALENTINA COATU |
| This paper presents original studies about the occurrence of some organic and inorganic pollutants in Romanian wine samples from the Dealu Mare, Jidvei, Murfatlar and Vrancea regions. Large quantities of pesticides are used to control mould and pests in |
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Dinamica spatio-temporala a structurii comunitatilor biotice in ecosistemele acvatice din Delta Dunarii
ELENA VOINEA, IRINA LUCACIU, MARGARETA NICOLAU, IULIANA CIURCANU |
| The paper presents the characterization of the hydrogeomorphological units aquatic ecosystems of the Danube Delta, the temporal and spatial dynamics of the structure of the biotic commnunities. There were drawn momentary samples from the two stock compa |
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Etalonul de referinta pentru umiditatea relativa a aerului
VICTORITA PAUN |
| The paper presents fundamental issues on hygrometry and metrological standard for relative air humidity. Experimental results by working with an electronic psihrometer with aspiration, used as humidity sensor, were discussed. Its metrological performance |
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Evaluarea parametrilor caracteristici la retinerea Cr(VI) din solutii apoase prin schimb ionic in conditii dinamice pe anioniti puternic bazici
ION UNTEA, CRISTINA ORBECI, ELENA TUDORACHE, DUMITRU TURTOI, VIOLETA NEAGU |
| The study presents the experimental data concerning kinetic aspects of Cr(VI) ion retention from aqueous solution by ion exchange in the dynamic conditions on strong base anion exchangers Purolite A 400 - the commercial type based on styrene - divinylbenz |
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Inhibitia oxidarii 2-aminofenolului in prezenta tirozinazei
extrase din ciuperci
MIHAELA PUIU, ADINA RADUCAN, DUMITRU OANCEA |
| The kinetics of 2-aminophenol oxidation with oxygen from air catalysed by mushroom tyrosinase in neutral aqueous medium was studied using a spectrophotometric method. The kinetics in the initial conditions is of Michaelis-Menten type, in agreement with e |
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Masurarea coeficientilor de difuzie multicomponent pentru clorura de lisozima in apa si solutie apoasa de Na2SO4
DANIELA BUZATU, EMIL PETRESCU, CARMEN POPA, FLORIN D. BUZATU, J.G.ALBRIGHT |
| This paper presents a diffusion experimental study for ternary lysozyme-NaSO-water system, from moderate precipitant concentrations into the supersaturated region and provides a complete set of four diffusion coefficients. These data are important in orde |
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Modelarea fenomenologica bazica a comportamentului reologic a fazei ternare in sistemele compozite de polimeri fazici.I. Perspectiva deformarii uniforme
HORIA PAVEN |
| The development of the proposed approach is mainly focused on the clarification of first phenomenological principles in the case of the basic model of uniform deformation, within the realm of a non-conventional hierarchical approach, in the case of terna |
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Sinteza fosfonatilor polimerici folosind cataliza
prin transfer interfazic
ADRIANA POPA, GHEORGHE ILIA, SMARANDA ILIESCU, CORNELIU MIRCEA DAVIDESCU,
LAVINIA MACARIE, NICOLETA PLESU
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| Phosphonate-derivatized polystyrene-divinylbenzene-based (PS-7%DVB) resins have been prepared from chloromethyl-polystyrene-divinylbenzene by the Michael-Becker reaction under phase transfer catalysis conditions. The proposed procedure for preparation is |
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Studiu comparativ al dehidrogenarii si oxidehidrogenarii
n-butanului pe un catalizator de pirofosfat de titan
IOAN-CEZAR MARCU, IOAN SANDULESCU |
| The catalytic performances of a crystallized titanium pyrophosphate were evaluated in n-butane dehydrogenation and oxidehydrogenation reactions. This catalyst was efficient for n-butane activation both in absence and in presence of oxygen, the catalytic a |
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Studiul analitic al derivatilor de fenotiazina
Determinarea tietilperazinei
ION GANESCU, GEORGE BRATULESCU, ION PAPA, ANCA GANESCU |
| New complex salts of 2-(ethylthio)-10-<3-(4-methyl-1-piperazinyl)propyl> phenothiazine with Reineckes salt and its analogues NH4, NH4 were obtained. The excellent thermal stability of thiethylperazine in the above comple |
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Studiul influentei temperaturii si pH-ului acid asupra inactivitatii penicilinei G
MONICA MATEESCU, LARISA MACESANU |
| In the paper it is studied the influence of the main parameters of penicilins biosynthesis pH and temperature on the stability of the penicilin G. The solutions stability of the sodium /potasium benzilpenicilin(penicilin G) is very low. The inactivati |
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Studiul proprietatilor electrochimice ale compusilor coordinativi
ai Tl(III) cu acizii piridin carboxilici si amidele acestora prin voltametrie ciclica
Studiul proprietatilor electrochimice ale compusilor coordinativi
ai Tl(III) cu acizii piridin car |
| Electrochemical properties of TlCl3 complexes with pyridine-carboxylic acids: picolinic (picH), nicotinic (nicH) and isonicotinic (inicH) and pyridine-carboxamides: nicotinamide (nica) and isonicotinamide (inica) by cyclic voltammetry were studied. The cy |
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| AL. SZEP, GH. MIHAILA, Studiul cinetic al dizolvarii reactive a carbonatului de calciu precipitat in solutii de acid sulfuros |
| This paper deals with a kinetics of the reactive dissolution of calcium carbonate in solutions of sulphurous acid. Advancing rate process was investigated by means of conversion yield of calcium carbonate versus time with temperature and granule size a |
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BIANCA MARANESCU, ZOLTAN SZABADAI, CONSTANTIN COSMIUC, GHEORGHE ILIA
Studiul fototransformarii 1,4-dihidro-2,6-dimetil-4-(2-nitrofenil)-3,5-piridincarboxilatului de dimetil (Nifedipina) |
| The 1,4-dihydro-2,3- dimethyl -4- (2- nitrophenyl)-3,5- pirydinecarboxilic acid- 3,5- dimethyl ester, a basic component of the medicine Nifedipin, suffers irreversible transformations under the influence of light, mostly resulting 2,6- dimethyl -4- (2-ni |
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CATALINA CIMPEANU, DORIN DUDU, ZOLTAN SZUCS, PAUL MURGOCI, ION MIHALCEA
ObTinerea unor surse etalon de 48V pentru
tomografia de emisie pozitronica |
| The results depicting the optimal conditions for obtaining radionuclide 48V, a positron emitter with:T1/2=16.0d, g-lines: 511.0 keV (98.8% absolute intensity), 983.5 keV(100%), 1312.1 keV( 97.5%), by nuclear reaction: 48Ti(d,2n)48V are presented. The |
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CLAUDIA MARIA SIMONESCU, VALENTIN SERBAN TEODORESCU, MARIA BREZEANU, ALINA MELINESCU
Evolutia morfologiei si formei nanocristalitelor monosulfurii de cupru cu timpul de reactie |
| Copper monosulfide nanocrystallites have been obtained by reaction between copper acetate and sodium thiosulphate (1:4) at 90±5oC. The powder was studied by X ray diffraction, IR spectrometry and TEM transmission electron microscopy and electron diffrac |
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CORNEL PATRASCU, GHEORGHE BREBEANU, LOREANA IRENA DOBRE, MARIA POPA
Depoluarea solurilor contaminate cu produse petroliere lichide prin incinerare |
| The paper presents the information about the contamination of soils polluted with oil products, using the incineration method. The burn processes were achieved into an original pilot installation. There were determined the loss of soil mass during the bur |
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CORNELIA NICHITA, MARIA GIURGINCA, AURELIA MEGHEA
Evaluarea capacitatii antioxidante a extractului de Hypericum perforatum |
In this work spectral characteristics and antioxidant activity of plant extracts of Hypericum perforatum species from geographical sources are described concerning the flavonoids content.
Keywords: UV-VIS-FTIR spectra, chemiluminescence technique, ext |
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COSTEL SARBU, LUCA LIVIU RUS, IOAN TOMUTA
Analiza spectrofotometrica simultana a amestecului format din acid ascorbic si rutin prin metode de regresie bazate pe
analiza componentelor principale |
| A study involving the interplay of pharmaceutical analytical chemistry, electronic absorption spectrophotometry and chemometrics has been described. It concerns the determination of ascorbic acid and rutin in synthetic samples and different pharmaceutical |
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COSTICA ATANASIU, NICOLAE ILIESCU, ANTON HADAR
Cercetari comparative privind starea de tensiune dintr-o placa rezemata pe antretoaze, incarcata cu presiune hidrostatica |
| In the paper, the results of an experimental study undertaken by strain gauge technique, regarding stress state in the plates hydraulically loaded, rested in points, are presented. Such plates are largely utilized in the steam, boiler construction and in |
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COSTICA STRATULA, CASEN PANAITESCU, ALINA LUNGU, ALEXANDRU PANA
Unele consideratii privind eliminarea avansata a epiclorhidrinei din 1,2-dicloropropan prin fractionare |
| In the purification process of propeneoxide it results one residue named raw 1,2-dichloropropane where the secondary main products are: 1,2-dichloropropane, 2,2 dichlorodiisopropylether. The binary 1,2-dichloropropane- epychlorhydrin has a non-ideal beha |
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CRISTIANA RADULESCU, CORNELIU TARABASANU-MIHAILA, ANA-MARIA HOSSU, IONICA IONITA
Studiu comparativ privind metodele de sinteza ale sistemului heterociclic |
| This paper presents some preparative alternatives for the synthesis of 2-aminothiazolo<4,5-b>pyridine, one of them being original and unknown in the speciality literature, and for each method the reaction conditions are analyzed. Also, the structure of t |
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DANIELA BRATESCU, GHEORGHE HUBCA, FLORIN MARIS
Cercetari privind obtinerea si utilizarea sistemelor de surfactanti cu grupari anionice si cationice |
| This paper describes the conditions necessary to prepare some surfactants with synergistic properties, which contain both anionic and cationic groups within the same system. Mixing of an anionic surfactant with a cationic one usually leads to the formati |
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ELIZA OPREA, VALERIA RADULESCU, SILVIA CHILIMENT
Cercetari privind compozitia chimica a compusilor volatili din flori de Sambucus nigra L. prin gaz cromatografie cuplata cu spectrometria de masa |
This paper presents the results concerning the chemical composition investigation of essential oil and infusion of Sambucus nigra flowers. Separation of essential oil from the flowers was conducted by steam distillation. The quantity of the resulted ess |
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GABRIELA CILINCA, MINODORA LECA
Interactiunea ionilor de cadmiu si plumb cu unii dintre componentii din detergenti in conditiile de spalare.
II. Complexarea cu EDTA
|
| ercentage complexing of lead and cadmium ions from individual and mixed ion solutions with EDTA in distilled and synthetic hard water (10 and 16od) in washing conditions (stirring, contact time 30 min, pH 10) was studied. It was determined that complexing |
|
GHEORGHE ROMAN, ILEANA MANCIULEA, RODINEL ARDELEANU
Compusi organici ai sulfului V. Noi derivati ai hidrazidei acidului 2-tienilacetic |
| Condensation of 2-thienylacetic hydrazide 1 with alkoxy-substituted aromatic aldehydes has led to the corresponding hydrazone derivatives 3a-e. Addition of the aforementioned hydrazide to various isocyanates and isothiocyanates gave the related semicarbaz |
|
LAVINIA MACARIE, GYÖNGYI HUDAK, GHEORGHE ILIA, SMARANDA ILIESCU
Polimerizarea fotoinitiata a acrilatilor in prezenta de benzildimetilcetal si p-metoxibenzoildifenilfosfinoxid |
| The photoinitiating activity of benzyldimethylketal and p-methoxybenzoyldiphenylphosphine oxide was studied by differential scanning photocalorimetry. These photoinitiators are efficient in photoinitiated polymerization and were applied to obtain UV-cured |
|
LOREDANA ELENA VIJAN
Studiul fluorescentei sistemelor mitramicina - ADN si cromomicina A3 - ADN |
| The interaction of two related anticancer drugs belonging to the aureolic family of antibiotics, mithramycin and chromomycin A3, with calf thymus DNA was studied by fluorescence spectroscopy. The positive curvatures of the Stern-Volmer plots obtained for |
|
LUMINITA VLADESCU, MARIANA SERDARU, LUOANA PASCU, MARIANA ROPOTA
Studiu privind continutul
unor elemente din vinuri albe inainte si dupa deferizare
|
| In this paper are processed and discussed data concerning cations content of alkaline, alkaline-earth and transitional metals which are determined through emission spectrometry and flame absorption in different age wines, from five white sorts, before an |
|
MARIUS MILEA, CAROL CSUNDERLIK, MONIKA SIMON
Utilizarea trifosgenului in sinteze de
n-carboxianhidride |
| This work is an attempt to synthesize N-carboxianhydrides (NCAs), also known as Leuchs anhydrides, starting with á-amino acids and triphosgene. Bis(trichloromethyl)carbonate, commonly known as solid phosgene or triphosgene, was successfully employed, re |
|
MIHAELA GABRIELA BITA, MIRCEA PREDA
Influenta activitatii apei asupra evolutiei peroxizilor din cafea in diferite conditii de depozitare |
| Sorption isotherms at 4 and 22.5oC were obtained for Arabica coffee samples, medium roasted at a temperature of 220oC and grounded to obtain an uniform size distribution of particles of 1mm. Roasted Arabica coffee was stored in various media: air at nor |
|
MIHAELA MURESEANU, ION Gh. TANASE
Determinarea urmelor de ruteniu din curentii
de hidrogen catalitic prin polarografie diferentiala de puls si voltametrie
|
| Simple and sensitive electrochemical techniques for the convenient determination of trace amounts of ruthenium were developed, based on the catalytic currents of a Ru (III),Ru(IV) Cl- system on the surface of a hanging mercury electrode in the potential |
|
MIHAIL CONTINEANU, ANDREI DOBRESCU, IULIA CONTINEANU
Caracterizarea prin RPE a speciilor radicalice formate la iradierea seleniatului de sodiu |
The authors study the irradiated polycrystalline Na2SeO4 by ESR. On the basis of g factors and interaction of the odd electron with the magnetic moment of 77Se (I = œ) nucleus, a number of paramagnetic species have been identified.
Keywords: phase trans |
|
RODICA MARIANA ION, SIMONA APOSTOL
Studiu fotochimic al agregatelor porfirinice |
| Porphyrins can form a variety of structures from linear head-to-tail or J-aggregates to fractal aggregates with different and specific photophysical properties. The aggregation process of some sensitizers such as tetrakis(4-sulphonatophenyl) porphyrin (TS |
|
SIMONA BUNGAU, FELICIA DRAGAN, ADRIANA MOLDOVAN
Sinteza si analiza complecsilor de asociatie ionica ai metoprololului |
| The purpose of this paper is to synthetise some ionic association compounds that are formed by metoprolol with heteropolyacids (Reinecke salts, phosphomolybdic acid and phosphotungstic acid), to elemental analyse of the obtained compounds, to establish th |
|
TARKO LASZLO
Calcule QSPR/QSAR cu ajutorul programului PRECLAV |
| This paper presents the features of PRECLAVs (Property Evaluation by Class Variables) last version, characteristics that distinguish PRECLAV from other computer programs for QSPR/QSAR computations. PRECLAV analyses a set of superposed molecules, without |
|
VALERICA DUMITRESCU, MARCELA MITRITA, IOANA CRUCERU
Metoda gaz-cromatografica
folosita pentru evaluarea procesului de remediere chimica si biologica aplicat solurilor poluate cu produse petroliere
|
| A simple and sensitive gas chromatographic method for the determination of petroleum products in soil samples was used in order to monitor the chemical and biological remediation processes of soil from a high polluted industrial area. The method involves |
|
VASILE DINOIU
Sinteza heterociclurilor fluorinate |
| 3,5-Dialkyl-4-hydroxybenzylhydrazine 1 reacted with hexafluoroacetylacetone, and trifluoroacetylacetone yielding the pyrazoles 2 bearing trifluoromethyl and/or methyl substituents in positions 3 and 5. The same hydrazine derivatives 1 afforded with trifl |
|
Aspecte secundare
ale controlului reactorului Hybridoma cuplate cu raspunsul metabolitilor
IRINA DANA Ofiteru, ALEXANDRU Woinaroschy, VASILE Lavric
|
| Monoclonal antibodies (MAbs) produced by hybridoma cells have an expanding market in many in vivo and in vitro domains. There is a number of complications in growing hybridoma cells, which are very sensitive to environmental changes. The metabolism of gl |
|
Combinatii complexe ale unor metale de tip 3d si 4f cu derivati de biguanid N-substituiti cu activitate antioxidanta si antimicrobiana
Ticuta Negreanu-Pirjol, Mihaela Bratu, Mariana Arcus, Maria Giurginca, Cornelia Guran
|
| This paper presents the synthesis of new 3d Cu(II), Mn(II), Co(II), Ni(II), Fe(III),Cr(III) and 4f La(III) metal complex compounds with the ligands N,N-dimethylbiguanide and p-tolylbiguanide. The compounds have been characterized by elemental analysis, sp |
|
Dezvoltarea si validarea
unei metode spectometrice secundare derivata pentru determinarea mercurului (II) folosind
3,4,5 trimetoxicinamoiltioamida
Irinel Adriana BADEA, Cornelia CERCASOV, Alexandra RUJA
|
| Simple, high selective and very sensitive UV second derivative method was developed for the determination of mercury (II) with 3,4,5 trimethoxycinammoylthioamide. The method is linear between 0.01 0.20 ppm of Hg(II). The LOD determined statistically was |
|
Electrodepunerea cobaltului pe otel inoxidabil
BOGDAN TUTUNARU, ADRIANA PATRU, MIRCEA PREDA
|
| Cobalt electrodeposition onto stainless steel from CoSO4 solutions at different concentrations was evaluated in the absence and the presence of boric acid, ammonium citrate, tartric acid and sodium chloride. The phase formation of cobalt film onto a stain |
|
Hidroliza cloroalchilesterilor unor acizi cloroalchilfosfonici
cu solutii apoase de acid fluorhidric
Ioan Talos, Alfa-Xenia Lupea, Aurel Mircea Toderici
|
| The paper presents the results obtained by the hydrolysis of chloroalkylesters of some chloroalkylphosphonic acids in hydrofluoric acid water solution, at 95 oC and atmospheric pressure. In the presence of hydrofluoric acid, hydrolysis takes place selecti |
|
Influenta acidului ascorbic, tiaminei si riboflavinei
asupra reactiei de hidroliza a amidonului cu amilaze endogene, utilizand interferometria laser
Alina Caraban, Simona Bungau, Alexandrina Fodor, Oana Stanasel
|
| Present paper presents an original method of starch hydrolysis rate determination, in presence of ascorbic acid, using laser interferometer techniques. The study of kinetic enzymatic reaction is based on refractive index determination, in the biochemical |
|
Influenta parametrilor de mediu asupra alcalazei imobilizate
prin legare fizica si entrapare in gel de silice obtinut
prin tehnica sol-gel
MONICA DRAGOMIRESCU, BEATRICE OROS, GABRIELA PREDA, FRANCISC PETER
|
| The sol-gel process is a relatively new method allowing the room temperature synthesis of silica glasses. The recent extension of this process to the entrapment of active biomolecules demonstrated that it is posssible to introduce biological activity wi |
|
Influenta solventilor asupra comportarii
polarografice a ionului de paladiu
VALERICA DUMITRESCU, MIHAELA CALUGAREANU
|
| The study presents the polarographic behavior of palladium ion in presence of the reagent 1.10-phenantroline and the following solvents: hexamethylphosphortriamide (HMPA), dimethylphormamide (DMFA), dimethylsulfoxide (DMSO). The method can be used for |
|
Metoda radiochimica pentru cercetarea procesului
de nucleatie a cristalelor
ALEXANDRU CECAL, ANCA IRENA BALAN, NICOLETA MELNICIUC- PUICA
|
| This paper deals with a kinetic study on appearance and growing of crystallisation germs, from aqueous saturated solutions, of some simple and double salts: K2SO4; CoSO4 . 7H2O; NH4Cl; CdCl2 . 2H2O; K2SO4.CoSO4. 6H2O; NH4Cl . CdCl2, as well as of two su |
|
Modelarea proceselor termogazodinamice din cilindrul motorului
cu aprindere prin scanteie alimentat cu hidrogen
CONSTANTIN PANA, GHEORGHE HUBCA, NICULAE NEGURESCU, MARCEL GINU POPA
|
| Hydrogen is an excellent fuel for internal combustion engines due to its properties. Problems like cost-efficient storage are still not answered. An important problem for the successful use of hydrogen in internal combustion engines is the availability of |
|
Optimizarea tratamentului termic
pentru un aliaj de aluminiu AlCu2,5Mg
ALINA-ADRIANA MINEA, IOAN GABRIEL SANDU
|
| This paper presents studies regarding the behavior at heat treating of an AlCu2,5Mg aluminium alloy. The experiments were made on laboratory conditions and can be applied on industry. The proposed methodology can be resumed in: adopting the heat treating |
|
Procese de intarire ale sistemelor
de lianti fara ciment Portland
STEFANIA STOLERIU, ION TEOREANU
|
| Activated cementitious material - puzzolana binding systems, free of Portland cement, are in present a strong economical, energy-saving and ecological concern. Present paper deals with hardening process and properties of such hydraulic binders based on th |
|
Sinteza de glicozilsulfone in conditiile CTI
IOANA SISU, NICOLAE DINCA, EUGEN SISU,
|
| The synthesis of glycosyl sulphone in PTC conditions using dioxirane generated in situ are presented. The yields of the oxidations in PTC conditions (60-81%) are comparable with those of reactions using NaIO4 and RuCl3 as catalyst. The synthesised glycosy |
|
Sinteza hidrotermala a unor materiale mezoporoase cu vanadiu
Evelini Popovici, Alina-Mihaela Hanu, Rodica Pode, Dumitru Timpu, Gheorghe Singurel
|
| It is know that isolated transition vanadium ions/oxides inside the MCM-41 network or /on the surface of these materials are a class of active sites for selective oxidation of various organic compounds. In view of vanadium incorporation, in this paper th |
|
Studiu asupra adaosului aromatic in slamul de cracare catalitica, pentru sinteza COPNA
Guo Yansheng, Chen Lili, Zha Qingfang, Gheorghe Brebeanu, Cristina Dusescu, Paul Rosca
|
| Fourier Transform Infra red Spectroscopy (FT-IR), Proton Nuclear Magnetic Resonance (1H-NMR), Carbon 13 Nuclear Magnetic Resonance (13C-NMR) and group compositional analysis were used to characterize the synthesis reaction of fluidized catalytic cracking |
|
Studiu asupra unui mecanism
posibil al toxicitatii cadmiului (II)
Laura BANCU, Simina STEFAN, Ioana JITARU
|
| With the reason to clarify the toxicity of cadmium ions in human body three Cd(II) complexes of alanine and citosyne have been isolated from aqueous solutions and characterized by means of elemental chemical analyses, molar conductivity data, FT-IR and el |
|
Studiul comportamentului adezivilor pe baza de elastomeri nepolari nevulcanizati,
aplicati pe substraturi elastomerice nepolare vulcanizate
Ioana Dusescu, Ioan Liviu Dan, Paul Octavian Stanescu, Camelia Hodosan, Gheorghe Hubca
|
| Utilization of adhesives is indispensable in any field of activity. Because of that, in practice a very wide range of adhesives is used and they are recommended for joining different supports. Adhesion is a very complex process depending upon many factors |
|
Studiul DSC al cineticii hidrolizei zaharozei pe cationiti sintetici
I. Catalizatori carboxilici
Dorina CHAMBRE , Maria Raluca SZABO, Cornelia IDITOIU
|
| This paper presents the influence of carboxylic catalytic properties upon the sucrose hydrolysis kinetic, catalyzed heterogeneously by a series of low-acidity carboxylic cationites having different cross-linking degree, granulation, porous nature of polym |
|
Transformarile undelor si reteaua
neutra artificala pentru rezolutia cantitativa a mixturilor ternare
ERDAL DINC, DUMITRU BALEANU, AYSEGÜL TAS
|
| Two different approaches continuous wavelet transform (CWT) and artificial neural network (ANN) were successfully applied to the quantitative resolution of ternary mixtures of paracetamol (PAR), metamizol (MET) and caffeine (CA) having strongly overla |
|
| Caracterizarea unor fluorofenilcolesteril carbamati si interactia lor cu ciclodextrine |
| Some new fluorofenyl-cholesteryl carbamates were prepared by reaction of cholesterylchloroformate with fluorofenyl-amines, in the presence of the pyridine as an acid acceptor. These compounds were characterized by IR, NMR and studied by thermal methods. T |
|
| Compusi organofosforici ca fotoinitiatori pentru rasini poliesterice acrilice si nesaturate |
| Compounds of the acylphosphonate type(terephtaloylbis(dimethylphosphonate), terephtaloylbis(diethylphosphonate) and terephtaloylbis(diphenylphosphine oxide)) were studied as photoinitiators for the radicalic polymerization of the acrylic monomers and unsa |
|
| Determinarea acidului mercaptoacetic utilizand un sistem de analiza prin injectare in flux cu detectie chemiluminometrica |
| A flow injection system (FIA) for the mercaptoacetic acid (MAAc) determination was carried out and optimized. The analytical method is based on a new chemiluminescence (CL) reaction between luminol and mercaptoacetic acid in the presence of a co-oxidant a |
|
| Determinarea unor anioni din apele raului Arges prin cromatografie ionica |
The paper presents a study of some anions (fluoride, chloride, nitrite, bromide, nitrate, phosphate and sulfate) from Argeș river water.The concentration of anions was determined by ion chromatography with conductometric detection.
Keywords: anions, ion |
|
| Determinarea voltametrica a vitaminei C la suprafata unui electrod modificat cu un copolimer conductiv |
| Poly(thiophene-3-acetylthiophene) was electrochemically deposited on glassy carbon disk electrode. Cycling the working electrode between two potential limits from +0.500 to +2.000 V vs. SCE has been the method used for the copolymerization. The copolymeri |
|
| Evaluarea capacitatii de protectie a antioxidantilor prin chemiluminescenta |
| The paper presents the new method needed to determine the protection capacity of the antioxidants. The chemiluminescence method used luminol H2O2 as the generator couple. The kinetic characteristics ( the quenching index, the constant rate of process a |
|
| Fenomene tipice de poluare a apelor de suprafata induse de geometria haldelor de zgura si cenusa de la CET Isalnita |
| A quantitative analysis of the ashes and slag stack impact on the surface waters in the area of Ișalnița power plant has been presented on a 7-year survey basis. By monitoring the main specific parameters of the released waters in Jiu River and in two clo |
|
| Hidrodinamica bulelor generate de difuzori porosi |
| In the paper it is studied the hydrodynamic qualities of gas bubbles generated by the porous diffusers: the initial radius of the gas bubbles, its variation during the upward moving, the theoretical velocity and its approximation in practice.The experimen |
|
| Impactul tehnologiei informatiei (TI) in luarea deciziilor |
| Drawing from a study perspective, this paper examines how information technology (IT) has been a catalyst in the development of new forms of organizational needs. The article draws a linkage between IT support and decision making process. The article sugg |
|
| Influenta dezordinii structurale asupra bazicitatii sistemelor vitroase oxidice |
| Most of the properties for vitreous oxide systems can be calculated depending on their chemical composition. Basicity is one of them. Generally, those types of relations do not take into account some factors on which obtaining glass depends. In this pape |
|
| Influenta modificarii cu P, Si si Ti asupra paraselectivitatii zeolitului H-ZSM-5 |
| The influence of the modifications with P, Si and Ti on the physico-chemical properties, catalytic activity and paraselectivity of H-ZSM-5 zeolite utilised in ortho-xylene izomerisation was investigated and correlated with the nature of the modifying agen |
|
| Influenta modificatorilor de matrice in determinarea plumbului din lapte praf, prin spectrometrie de absorbtie atomica cu atomizare electrotermica |
| In this paper was studied the effect of phosphoric acid compared to palladium nitrate, as matrix modifiers, on the determination of lead. A chemical modifier could then be used to increase the atomization temperature, which has the potential of eliminat |
|
| Interactiunea dintre apa de zacamant si mediul solid din zacamintele petrolifere ale structurii Geamana |
| The paper studies some aspects regarding the action of oil-pool waters, having an established chemical composition on the reservoir rocks of the petroleum deposits, in order to prevent the physico-chemical plugging of pores. The characteristics of the sol |
|
| Metoda de testare a modelelor de conducere automata evoluata a proceselor de fractionare |
| The way in which fractionating processes are controlled so as to reach specific objectives represents an essential factor of their performances. These performances are usually reflected by the effort required by the respecting of the resulted products qu |
|
| Reducerea electrochimica a benzaldehidei si acetofenonei pe electrod de platina modificat chimic cu tetrafenil porfirine |
| The electrochemical reduction of acetophenone and benzaldehyde on modified platinum electrode with some porphyrins derivatives has been achieved. Electrochemical behavior of acetophenone and benzaldehyde was studied by cyclic voltammetry. The electrocatal |
|
| Sinteza si caracterizarea complexului |
| Compounds of metals in mixed oxidation modes are known for a long time. The special properties of these compounds are: intense colour, very good electrical conductivity and magnetism <1>. These properties were explained by assigning metals less ordinary v |
|
| Studiu teoretic al reactiilor Diels-Alder ale azafosfa(ARSA)benzenilor |
| A theoretical study of geometry and reactivity of 2,4,6-triphenyl-1,3-ë3-azaarsabenzene and 2,4,6-triphenyl-1,3-ë3-azaphosphabenzene in Diels-Alder reactions with less reactive alkynes were performed. The computed values for molecular geometries were clos |
|
| Studiul coroziunii otelului-carbon in medii amoniacale diluate |
| The carbon-steel corrosion in diluted ammoniacal media and nitric acid was studied using the techinque of polarization curves. In practical conditions, the corrosion is followed by ferric hydroxide precipitation. On account of this fact, in order to deter |
|
| Unele consideratii asupra optimizarii instalatiilor de amestecare |
| Following the results obtained in a previous work <1>, there are analysed the following problems referring to optimising a mixing installation: - mixing installation optimisation from the point of view of mixing required power and energy consumption; - ve |
|
Analiza dispersa a tufului vulcanic clinoptilolitic
II. Caracterizarea fractiunilor
ADRIANA VUZA, MIHAI LIVIU CRAUS, LUCIA ODOCHIAN, MIHAI DUMITRAS, FLORINA CRIVOI |
| This paper aims at characterizing, by density, IR spectra, X-ray diffraction, non-isothermal thermogravimetric analysis (TG, DTG) and electrical conductibility, of the Mârșid-Ortelec clinoptilolitic volcanic tuff fractions obtained by screening. The study |
|
Analiza Fuzzy si aplicatiile sale in studii QSAR
COSTEL SARBU, MAVROUDIS A. DEMERTZIS, DIMITRA KOVALA-DEMERTZI |
| Principal component analysis (PCA) is a favorite tool in analytical chemistry and other technical fields for data compression and information extraction. PCA finds linear combinations of the original measurement variables that describe the significant var |
|
Comportamentul lipidelor in camp electric
2. Amestecuri de steride mezogene, glicerol
BENEDICT OPRESCU, CARMEN TOPALA |
| Cholesteryl esters are liquid crystals in biological system. This study shows a model membrane in an electrolytical cell. An electrical drift induces and relaxation time is measured. The relaxation time is important in transmembranal microtransport phenom |
|
Controlul emisiilor primare de N2O in productia de acid azotic
JÜRGEN NEUMANN, HUBERTUS GÖLITZER, ALAN HEYWOOD, ION TICU
|
| This study presents the analysis of the opportunity for N2O primary emission control in the production process of azotic acid by catalityc oxydation of ammonia with atmospheric oxygen on platinum catalytic sieves. For the experimental studies there was u |
|
Cuantificarea stresului oxidativ în biosisteme
IV. Structuri biologice complexe
NICOLETA IFTIMIE, MARIA GIURGINCA, AURELIA MEGHEA |
| The aim of the paper is to simulate in vitro the effects of the oxidative stress on some complex components of human cells like couples of aminoacids, vitamins and fatty acids. In this respect, some specific spectral techniques were used: UV VIS, IR and |
|
Determinarea cobaltului din probe alimentare
MARIANA SAULEA, ANCA-IULIA STOICA, GEORGE-EMIL BAIULESCU, DANIELA MARINESCU, MIHAI IONICA
|
| The aim of this paper is to determine the content of cobalt in food samples (spinach leaves, cabbage leaves, lettuce leaves, parsnip root, celery root, garlic root, white onion root, red onion root, orange, tangerine, red grapefruit, apple, pear, milk, po |
|
Determinarea vitaminei C din cirese si visine
NICOLETA MATEI, VASILE MAGEARU, SEMAGHIUL BIRGHILA, SIMONA DOBRINAS
|
| The ascorbic acid (vitamin C) is of vital importance in processes of oxidation and reduction in human organism, participating of several metabolic reactions. Ascorbic acid has also been used for the prevention and tratment of the common cold, mental ill |
|
Dimensiunea fractala a unor tecto-dendrimeri
DORINA CREANGA, CRISTINA STAN, EMIL PETRESCU |
| In this work it is presented a computational study of some dendrimer structures. The fractal dimension of dendrimers derived from ethylene diamine core was calculated for seven consecutive generations using Box-counting method. It was found some linea |
|
Influenta performantei metodei semiempirice PM3 cu hemi complecsi asupra activarii dioxigenului si peroxidului
RADU SILAGHI-DUMITRESCU |
| It is examined the performance of the PM3 semiempirical method with ferrous-dioxygen, reduced ferrous dioxygen and ferric-hydroperoxo complexes with imidazole and methyl thiolate axial ligands. A comparison with theoretical data obtained with higher-level |
|
Instabilitati neliniare in cristale lichide nematice
LUCIAN GEORGESCU, CATALIN BERLIC, CRISTINA MIRON |
| Besides classical treatment of the electrohydrodynamic instabilities in nematic liquid crystals, based on charge, momentum and angular momentum conservation, a dynamic treatment based on solving some nonlinear differential equation is proposed. The Lorenz |
|
Modelarea functionarii acumulatorului plumb-acid sufuric in sisteme de conversie a energiei regenerabile
I. Modelarea acumulatorului plumb-acid sulfuric
IRINA NITA, DAN MANDALOPOL, CLAUDIA KONCSAG, CORINA TEODORESCU, OLGA IULIAN |
Models of lead-acid cell are reviewed. Mathematical models developed by various authors are presented. The reviewed models can be used to predict the profile of acid concentration, overpotential and porosity of solid matrix of electrod plates as functio |
|
| Oxizi ai aminelor saturate. VI. Comparatie intre stereoselectivitatile N-oxidarilor aminelor tertiare derivate din N-metilpiperidina |
The stereoselectivities of the N-oxidation reactions of eight N-methylpiperidine-derived tertiary amines, with hydrogen peroxide and with meta-chloroperbenzoic acid (MPBA), at room temperature, were examined by means of quantitative 13C NMR spectroscopy |
|
Pierderile 60Co, 134Cs si 137Cs in timpul testului de leaching din blocul de schimbatori de ioni conditionati
CARMEN ARSENE, DUMITRU NEGOIU |
| The goal of this work is the study on immobilization of spent ion exchangers during the treatment of liquid radioactive wastes from Decontamination Center as a monolithic block, so that the safety of the environment be ensured, during final disposal, acco |
|
Proprietati mecanice ale unor copolimeri acrilici utilizati ca adezivi sensibili la presiune
TEODORA STAICU, MARIN MICUTZ, MINODORA LECA |
| Emulsion copolymers based on acrylic and vinylic comonomers were prepared by semicontinous emulsion copolymetization and evaluated as pressure-sensitive adhesives. The obtained copolymers were characterised by their viscosity, rheological behaviour, and |
|
Radioliza sistemelor elastomerilor
etilenpropilenic/divinilbenzen
TRAIAN ZAHARESCU, SILVIU JIPA, RADU SETNESCU |
In this paper the g-radiolysis of blends consisting of ethylene-propylene terpolymer (EPDM) and divinylbenzene (DVB) is presented by exposure to 137Cs source. Radiation processing at various doses up to about 100 kGy was accomplished. In order to establ |
|
Sinteza si reactivitatea bazelor Mannich
XIX. Reducerea bis-bazelor Mannich cetonice derivate de la
cis,trans-2,5-dimetilpiperazina
GHEORGHE ROMAN |
| Five bis-Mannich bases prepared through aminomethylation of methyl (hetero)aryl ketones with cis, trans-2,5-dimethylpiperazine have been treated with NaBH4 in methanol at room temperature to afford the corresponding potentially pharmacologically active bi |
|
Spectrometria de masa diferentială (Dif MS) si chimia computatională
II. Dif MS si analize semiempirice MO ale exo- si endo-5,10-metilen-10,11-dihidro-5H-dibenzociclohepten-11-olilor
NICOLAE DINCA, MICHAELA DINA STANESCU, EUGEN SISU, MIRCEA MRACEC |
| Comparative analysis of the electronic impact mass spectra (EI-MS) of the exo- and endo-5,10-methylene-10,11-dihydro-5H-dibenzocyclohepten-11-ols revealed a similar fragmentation of these compounds. The paper presents a method for the correlation of |
|
Studii spectroelectrochimice privind originea si stabilitatea sarcinii spatiale adiacente electrodului polarizat
GHEORGHE SEMENESCU |
| There are presented the results of some spectroelectrochemical research aiming at the formation of some supermolecular structures, electrically charged, during platinum electrode polarization in naphtoquinone-in-dimethylformamide solutions on electrolytic |
|
Studiul proprietatilor chimice ale alchil si arildiclorofosfinelor
III. Nou compus heterociclic al fosfatului obtinut din p-tolildiclorofosfina
Sinteza, caracterizare si activitate biologica
EUGENIA FAGADAR-COSMA, GHEORGHE FAGADAR-COSMA |
| The synthesis of 2-tolyil-3-ethyl-3-methyl-5-methyl-1,4,2-diazaphosphorine-2-oxide by a Mannich-type reaction involving tolyldichlorophosphine, methyl ethyl ketone and 1,2-diaminopropan was performed. The new obtained compound was submitted to elemental |
|
Studiul speciilor radicalice formate la radioliza cromatului
de plumb
MIHAIL CONTINEANU, OLIMPIU CONSTANTINESCU, IULIA CONTINEANU |
| A kinetic study concerning CrO4- radical process by gamma irradiation at room temperature of polycrystalline PbCrO4 has been made using the EPR technique. A suitable mechanism of creation by irradiation and of thermal annealing of paramagnetic centers is |
|
Utilizarea biotestelor de toxicitate pentru determinarea caracteristicilor de toxicitate ale metalelor grele - Ni, Zn si Cu
GENTIANA RUSU, IRINA LUCACIU, ELIZA LEONTE PENA |
| The study has as objective the determination of the levels of acute lethal toxicity, also subacute and chronic, of the Ni, Zn, Cu metals which are administrated as sulphates to aquatic organisms (fish). The experiments were performed in three stages: |
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Valorificarea cioburilor de sticla in industrie
CAMELIA CAPATANA |
| The glass is one of the most energy - consuming materials because is consumes soda in the elaboration process in considerable quantities, as well as important quantities of methane gas. In this paper it is presented an example of the glass waste valor |
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Anhidrizarea alcoolului etilic prin fractionare azeotropa utilizand un nou antrenant
C. Stratula, F. Oprea,
D. Mihaescu
|
| In order to obtain anhydrous ethanol by azeotropic distillation it is proposed a new entrainer, hexane fraction. In absence of all binary interaction parameter necessary for calculus of activity coefficients, an easy and quick method is proposed. Experime |
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Aplicatii ale nanotuburilor carbon-azot la motoare moleculare actionate fotochimic
SIMONA RADA, IOAN SILAGHI DUMITRESCU, VISTRIAN MATIES, MARIUS RADA |
| The photoinduced isomerization of two functionalised carbon nitride nanotubes has been investigated. This process might be used in the conversion of the energy of light into mechanical energy without generating waste products. There were found small bar |
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Caracteristici chimico-structurale si capacitatea antioxidanta a unor extracte vegetale obtinute prin procedee clasice si moderne
CORNELIA NICHITA, CRISTINA BAZDOACA, MARIA GIURGINCA, AURELIA MEGHEA |
| In order to establish the correlation between their composition and antioxidant activity, active species have been extracted from medicinal plants (Hypericum perforatum, Crataegus monogyna, Polygoni avicularis) by classical and modern techniques and cha |
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Comportarea aliajelor de Ti6Al4V in electroliti care simulează biolichide specifice in cavitatea bucala
Elena Aldea, Nicoleta Iftimie, Ioana Demetrescu |
| The aim of this study is to detect the corrosion susceptibility of titanium alloy Ti6Al4V exposed to various simulated artificial saliva as Fusayama, Afnor and Tani-Zucchi. The evaluation of corrosion was performed using electrochemical methods as cyclic |
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Compozitia chimica a uleiului volatil izolat din diferite probe de Salvia officinalis L
Silvia Chiliment, Valeria Radulescu, Eliza Oprea |
| This paper presents comparative results concerning the chemical composition of essential oils obtained by steam distillation from three samples of Salvia off. leaves: two originate from the same area, harvested in different vegetation periods: blossoming |
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Compusi ai hexaclorociclotrifosfazenei utilizati ca biosimulatori
Constantin Cozmiuc, Victor Rojancovschi, Bianca Elena Maranescu, Gheorghe Ilia |
| The reaction product of hexachlorociclotriphosphazene with the 2-(diethylamino)ethyl 4 aminobenzoate (as chlorohidrate being known as procaine) was tested on weat seeds with good results. The product was obtained in para-xilene at boiling point, the large |
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Consideratii privind capacitatea de complexare
a dioximelor aromatice
DANIELA CIRTINA, ION GANESCU |
| The complexation capacity of the dioximic structures is determined by the oxime electron donor group present in their composition. The formed complexes by the oxime group with the step metals presents important physico-chemical properties (colour, solub |
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Consideratii privind mecanismul de conductie electrica la propagarea impulsului nervos
GHEORGHE SEMENESCU |
| By the experimental arguments presented here, the author tries to encourage the attempts of explaining the biophysics of the nervous impulse by an electronic conductance mechanism. Ionic pumps are seen as effects and not causes of the nervous impulse pr |
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Contributii la mecanismul reactiei de descompunere termica a amoniacului (II)
LUCIA ODOCHIAN, MIHAI DUMITRA, DANIELA DIRTU |
| The paper deals with the kinetic modelling of thermal decomposition of ammonia in a quartz reactor, at a temperature of 800oC. The extended mechanistic model proposed in this paper has been reduced by means of sensitivity analysis, on the basis of normal |
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Contributii la studiul sistemului ZrO2-TiO2 (I)
Ioana Rotariu, Dan Macarovici, Cristina Vasile |
| The sintering process of zirconia doped with 3-13 mol % TiO2 was investigated.The synthesized ZrO2 - TiO2 samples are characterized using and X- ray diffraction (XDR) and scanning electron microscopy (SEM) in order to determine crystal structure. Increas |
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Corelatii intre unii parametri analitici ai lignitului umed
de Vladimir si continutul de cenusa
ION VIASU-BOLOCAN, HOREA NASCU, ELENA MARIA PICA, GAVRIL NIAC, OSSI HOROVITZ, ALEXANDRU POPESCU |
| Linear relationships between moisture (as received, Wîi, hygroscopic, Wha, and total, Wti) as well as volatile matter content (Vi) and higher heating value (HHVi) versus the respective ash content (A), were observed for Vladimir lignite. Equations, errors |
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Coroziunea otelurilor in medii apoase din rafinarii
Eva Trimbitasu, Daniela Popovici, Octav Pantea, Stelian Neagoe |
| The paper presents the aspects regarding the steel corrosion in different aqueous media proceeded from the atmospheric and vacuum distillation plants from Petrobrazi SA. Corrosion tests were performed using the loss in weight method, by total immersion |
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Determinarea prin HPLC a unor coloranti
sintetici alimentari
MARIA-CRISTINA BRATU, ANDREI-FLORIN DANET, ADRIAN BRATU |
| In this paper there are presented the research results concerning the establishing of the optimal work conditions for the determination of synthetic food colorants by high performance liquid chromatography. This technique has been shown to have great pot |
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Evaluarea parametrilor cinetici neizotermi ai deshidratarii cationitilor sintetici carboxilici prin metode izoconversionale
Dorina Chambre, Cornelia Iditoiu, Petru Budrugeac, Eugen Segal |
| The authors present their results concerning a non-isothermal kinetic investigation of the dehydration steps of some weak-acid cationites. In order to evaluate the non-isothermal kinetic parameters from the usually applied methods, the isoconversional met |
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Metanolul-combustibil alternativ pentru ecologizarea motorului Diesel
MARCEL GINU POPA, NICULAE NEGURESCU, CONSTANTIN PANA |
| The oxigenated fuels used in the internal combustion engines represent an efficient solution for the combustion process improvement for the polluants emissions decrease from the exhaust gases, especially the smoke and the NOx. The decrease of this polluta |
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Model statistic pentru recuperarea schimbului ionic al nicotinei din extracte primare solid-lichid
Marta Stroescu, Petronela Matei, Florina Oprea, Octavian Floarea, Tanase Dobre |
| The investigation of the nicotine recovery from nicotine primary extract with a strongly acid cation-exchange resin is the work proposes. The experimental results were obtained using an experimental program with two levels, where the process factors are t |
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Modificarile diferitelor forme de fosfor din paine prin adaos de faina de cereale germinate
MARIANA-ATENA POIANA, IOSIF GERGEN, FLORINA RADU, ERSILIA ALEXA, ADRIAN RIVIS |
| This paper presents the modifications of phosphorus compounds in bread caused by the germinated cereals flours addition in different percentages. These changes were the result of enzymatic modifications in phytic acid under phytase action. The germinated |
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Producerea si separarea chimica a radioizotopului 22Na utilizat in
obtinerea unei surse pozitronice de 22NaCl
CATALINA CIMPEANU, LIVIU CRACIUN, DORIN DUDU, PETRU MIHAI RACOLTA, ION MIHALCEA |
| In this paper is presented an atempt on the obtaining of a positron source at the IFIN-HH U120 Cyclotron. The radioactive isotope as source of positrons is 22Na. For its production, the nuclear reaction: 24Mg(d, a)22Na was applied, where the deuterons |
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Reactiile de
cicloaditie ale 1-(4-fluorofenacil)-1,10-fenantroliniu N-ilidei cu alchine
FLOREA DUMITRASCU, CONSTANTIN DRAGHICI, MINO R. CAIRA, LOREDANA BARBU |
| The 3+2 cycloaddition reaction of 1-(4-fluorophenacyl)-1,10-phenanthrolinium ylide 4 with symmetrical and non-symmetrical alkynes gave pyrrolo<1,2-a><1,10>phenanthrolines 6a-c. The helical chirality of pyrrolophenanthrolines 6b,c was put in evidence by N |
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Sinteza si caracterizarea complecsilor de Ni(II) cu derivatii fenil-tioureei N,N-disubstituite
RICA BOSCENCU, ALEXANDRU MISSIR, VERONICA NACEA, LAURA SOCEA |
| New Ni(II) complexes with N,N-disubstituted phenyl thiourea ligands has been synthesized. These compounds were characterized by elemental analysis, IR, UV-VIS spectra. Tentative geometry of the complexes involves four-coordinate environments and a biden |
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Sinteza unor noi derivati ai 5,5-dioxidului 2-metildibenzo tiepin-11(6H)-onei
ANCA NICOLAE, STELIAN FLOREA, WOLF-DIETER RUDORF, ALEXANDER PERJESSY
|
Through the Knoevenagel condensation of the 2-methyldibenzothiepin-11(6H)-one 5,5-dioxide with aromatic aldehydes, some new derivatives have been obtained. The new compounds have been characterized by using IR, NMR spectra, mass spectrometry and el |
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Specierea si determinarea spectrometrica
a continutului de fier din vin
LUOANA PASCU, LUMINITA VLADESCU |
| This study presents and discusses the results regarding the speciation of the iron content through the determination of Fe(II) and Fe(III) concentrations in white wine samples using molecular absorption spectrometric methods in visible, which have been |
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Studii cu privire la biodegradarea primara a sarurilor acide ale metalului abietic alcalin prin metoda spectrometrica
FLORINA RADU, ALFA-XENIA LUPEA, AURICA BOROZAN, SVETLANA CACIG |
| The spectrophotometric method based on the use of the hydrophobic interaction between carboxilate anions of abietates alkaline salts and violet crystal has been developed for the determination of the degree of the primary biodegradation of these salts (a |
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Studiu asupra mecanismului de dizolvare neoxidativa a sulfurii de fier(II) cu structura hexagonala in mediu acid
PAUL CHIRITA, IOAN BERDAN |
| Nonoxidative dissolution of hexagonal iron(II) sulfide at pH values lower than 1.55 was investigated using two progress variables, i.e. the quantity of dissolved iron and quantity of formed hydrogen sulfide. In each experiment, four stages with particular |
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Studiu asupra spectrelor de absorbtie electronica, IR si 1H-RMN ale diclorurii de <5,10,15,20-tetrafenil-21H,23H-
porfirinat-N21,N22,N23,N24> Zr(IV)
EUGENIA FAGADAR-COSMA, DANA VLASCICI, AURELIA PASCARIU |
| This study is focused on the synthesis of meso-tetraphenylporphyrinato zirconium (IV) dichloride (Cl2ZrTPP) which is a potential sensor material in fluoride-selective liquid membrane electrodes. The Zirconium(IV)-metalloporphyrin was characterized by UV-V |
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Studiul hidrogenarii hidrocarburilor aromate in procesul de hidrodesulfurare adanca a combustibililor Diesel
ANCA STERRY |
| The hydrogenation of the aromatics was studied during the deep hydrodesulfurization of a gas oil on two commercial catalysts, CoMo/Al2O3 and NiMo/Al2O3. Quantitative determination of aromatics was obtained using a chromatographic analysis (HPLC). In cas |
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Studiul spectral al legarii mitramicinei si cromomicinei la ADN din timus de vitel
Loredana Elena Vijan |
| Mithramycin and chromomycin A3 are two related anticancer drugs belonging to the aureolic family of antibiotics. The binding of the drugs to calf thymus DNA is investigated using absorbance measurements. The results are rationalized taking into account bo |
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Substitutia izomorfa a Fe3+ in reteaua mordenitului cu pori mari
Aurelia Vasile, Dana Dorohoi, Dumitru Timpu |
| Fe-substituted large port mordenite have been hydrotermally synthesized under static conditions by gradually replacing Al with Fe in the middle alkaline gels (pH =10.3±0.1) using the Fe(III) source as an acidic solution (pH<2) and ethylenediamine as a com |
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Aspecte specifice privind comportamentul electrochimic
al otelului austenitic inoxidabil obtinut prin pulberi metalurgice
IOAN Roman, MIRCEA
Corban, Roxana Trusca, IULIAN Ciupitu
|
| The paper presents the comparative evaluation of the electrochemical characteristics of both rolled 316L stainless steel and processed by powder metallurgy (PM). Microstructural and microcompositional characteristics of samples were analyzed by scanning e |
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O metoda pentru determinarea viscozităatii rotationale la cristale lichide nematice
Emil Petrescu, Cornelia Motoc
|
| A relaxation method was proposed to estimate the rotational viscosity. The nematic liquid crystal was acted by a magnetic field having a strength higher than that corresponding to magnetic Freedericksz transition. After switching off the field changes in |
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Reducerea concentratiei de monoxid de azot la arderea carbunilor cu continut ridicat de cenusa
IONEL PISA,, CONSTANTIN NEAGA
|
| In this paper, the authors analyse the generation of NOx in coals with a high content of ash. On the one hand, the drying time has been determined, depending of the external mineral mass and the initial diameter of the coal particle. On the other hand, th |
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Analiza principalelor elemente minerale din mugurii foliari
ai unor specii medicinale
Camelia Ioana Peev, Cristina Adriana Dehelean, Diana Simona Antal, Petru Negrea, Mircea Tamas
|
| The present paper aims at contributing to the certification of the therapeutic potential of vegetal buds, based on their content in some macro- and trace elements. Buds prelevated from eight plant species were harvested from the wild flora of the Apuseni |
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Aplicatii de modelare pe baze non-deterministe
a procesului de clinchelizare
ZENO GHIZDAVET
|
| Complex processes modeling, such is the case of the clinkering process, requires a many-sided approach. Clinkering installations were subject to more or less accurate deterministic mathematical descriptions for decades, while the process itself that takes |
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Aspecte privind influenta polaritatii mediului asupra procesului de alcooliza a poliacetatului de vinil
DianaMihaela Hubca, Paul Octavian Stănescu, Camelia Hodosan, Gheorghe Hubca
|
| Previous research evidenced that the polarity of the reaction mixture has great influence on the alcoholisis process. In the presence of superior alcohols (C2-C10) or aromatic hydrocarbons the viscosity of the gel-phase shows important changes. Considerin |
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Capabilitatea unor microorganisme de a metaboliza ionul S2-,
continut ca poluant in ape uzate provenite din rafinarii
Andra Mihaela Micu, Gheorghe Niculae, Rodica Rusen
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Compusi coordinativi dinucleari ai Cu(II) cu derivati de
bis(3-R1, 4-R2, 5-Br, a-Rasalicil)1,5 pentilendiamina
(R1=H, Br, R2= H, -CH3, Ra=H, CH3, -CH2-CH3)
AUREL PUI, ALEXANDRU CASCAVAL
|
| Schiff bases used were obtained by condensation of salicylic aldehide, aceto- or propio- phenone bromo derivates with 1,5 penthylene diamine, in 2/1 molar ratio. Obtained compounds were analyzed by mass (ES MS), 1H NMR, IR and UV-VIS spectroscopy and elem |
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Coroziunea otelurilor si aliajelor în solutii de clorura de sodiu
OVIDIU NEAGOE, MIHAI V. POPA
|
| Study of corrosive processes intensity for some steels and alloys in sodium chloride solutions has a practical importance, considering that during winter, for snow clearing are often used mixtures of sand and salt and in the summer time, for aerosols qua |
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Degradarea prin coroziune a structurilor din beton armat
4. Modificările de pH si de compozitie chimica ale betonului expus actiunii
curentilor de dispersie
IOSIF LINGVAY, SÁNDOR GOMBOS, CARMEN LINGVAY, JÚLIA KOVÁCS, CONSTANTIN-DORINEL VOINIȚCHI
|
| The degradations by corrosion of great dimension underground concrete steel structures, frequently used at cities infrastructure constructions, are increased by d.c. and a.c. stray currents. In this paper, the results of experimental studies about pH and |
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Evaluare comparativa a analizei proteinelor serice prin
electroforeza in gel de agaroza si electroforeza pe hartie
DANIELA LAURA PALARIE, MIRCEA PREDA
|
| The present study has been performed on biological samples constituted by human blood serum, that were analyzed by agarose gel electrophoresis and paper electrophoresis for the separation and quantification of serum proteins. By using the values of concen |
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Evaluation of Degradation of Parchment and Leather by
FT-IR and UV-VIS-NIR Spectroscopy
TITE TEDDY, LUCRETIA MIU, MARIA GIURGINCA, AURELIA MEGHEA
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| Natural degradation of a large number of parchment and leather coming from various animal sources is analysed by FTIR and UV-VIS-NIR spectroscopy. Accelerated degradation of parchment during thermo-oxidative ageing, as well as under xenotest treatment is |
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Fenomenologia interfetei solid-electrolit
IV. Interfata solid/electrolit în regim dinamic
GhEORGHE Semenescu, AURELIAN Georgescu
|
| The solid-electrolyte interface, under potentiodynamical conditions, is regarded evolutively, microscopically, by a phenomenological model, suggested by the backround noise analysis during current-time electrochemical measurements. This model takes into a |
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Hidrogenarea citralului pe catalizatori Cu-Cr-Ba
Daniela Popovici, Traian Juganaru, Dorin Bombos, Cristina Dusescu, Vasile Matei
|
| The paper presents a study on citral (3,7-dimethyl, 2,6-octadienal) hydrogenation on Cu-Cr-Ba/Al2O3 catalyst. The influence of reduction conditions of the catalyst on their selectivity has been studied. Decrease of amount in Cr3+ species on the surface of |
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Metodă optimizata de mineralizare a probelor de sange urmata
de determinarea mercurului prin spectrometrie de absorbtie
atomica cu vapori reci la 184,9 nm
Maria-Cristina Bratu, Maria-Cristina Rizea, Andrei-Florin Danet, Adrian Bratu
|
| A complex method was proposed and optimized for blood samples digestion to make possible the determination of total mercury by using cold vapor atomic absorption spectrometry detection (CVAAS), at the main resonance line of mercury (184.9 nm). A new type |
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Obtinerea si caracterizarea unor octameri ciclici
din clasa calixarenelor
II. Acizi calix<8>aren-p-octasulfonici
ZOIA CRISTU, MARIANA MATEESCU, LUCIA MUTIHAC, IULIAN STANCIU, ELENA RUSE
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| The calix<8>arene-p-octasulphonic acid has been prepared with 50% yield by the direct sulphonation of p-tert-butylcalix<8>arene using concentrate sulphuric acid as sulphonating agent. The optimum conditions for the sulphonation has been described in the |
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Procese de hidratare si intarire in sisteme liante pe baza de var
si materiale hidraulic active
Alina BADANOIU, Maria GEORGESCU
|
| In this paper the hydration and hardening processes in lime-pozzolana systems are assessed. The pozzolanas were of volcanic nature (Racoș and Sugașu tuffs). Plaster (CaSO4.0.5H2O) in different amounts (1%,6% and 8%) was used as chemical activator. The hy |
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Reacția o, m, si p- clorurii de toluil
cu nitrobenzen activat ultrasonic si termal II. Reactia m-clorurii de toluil cu nitrobenzenul
Florica CHIVU, Liliana LUNGU, Petru FILIP,
Carmen STAVARACHE, Mircea VINATORU
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| In the second part of this series, the reaction of nitrobenzene with m-toluyl chloride, initially subjected to ultrasounds and then heated for 40h at 210șC, was described. The main reaction products were identified and a possible reaction mechanism was ad |
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Recuperarea vanadiului din reziduuri de cocs folosind
chelarea ligandului modificat sol-gel ca nou sorbent
Lygia Ulpiana Alexandrescu, Laurentiu Filipescu
|
| Recovery of vanadium from ash resulting from petroleum coke combustion is studied in a two-step method involving a hydrometallurgical ash treatment and a chelation step with sol gel modified ligands. The hydrometallurgical step consists of leaching and p |
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Scaderea conductivitatii termice a unui zacamant de petrol exploatat prin combustie subterană
TUDORA CRISTESCU
|
| Exploitation by underground combustion results in physical and chemical modifications of the oil reservoir, which include changes in the thermal conductivity. This work presents results of experimental studies on the estimation of the thermal conductivity |
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Separarea LaIII si YIII din medii apoase prin flotatie (DAF)
LIGIA STOICA, OLIMPIA MICU, VASILE POPESCU
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| The paper is a systematic separation study by DAF technique of a MIII = La and Y from aqueous systems as hydroxospecies-STA (where STA is tensioactive substance, dodecylamine). The species of monocomponent systems M(III) STA isolated in optimal conditi |
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Studiul obtinerii oxazolidin-2-onei din bis(o-nitrofenil)carbonat
si etanolamina
Andreea Micle, Monika Simon, Carol Csunderlik
|
| An efficient and mild method for the synthesis of oxazolidin-2-one is described, using bis(o-nitrophenyl) carbonate as carbonylation reagent and b-aminoethanol. The reaction was monitored by FT-IR spectroscopy and TLC. The product was obtained in best |
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Tiparul izoenzimelor. Criterii de analiză
CAMELIA PAPUC, CRISTIANA DIACONESCU, ELENA SLAVNICU
|
| Trout muscle (Salmo trutta fario), fresh and frozen for different periods of time, was investigated for sarcoplasma proteins electroforetic profile and some isoenzymes patterns localized in cytoplasm and subcellular organelles. Cryoconservation affects th |
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Transformarile produsilor cu unda scurta prin tehnici chemometrice
privind analiza cantitativă multirezoluție a unui amestec ternar ce conține paracetamol, acid ascorbic și acid
acetilsalicilic în comprimatele efervescente.
Erdal Dinç, Abdil Özdemi |
| Quantitative multiresolution analysis of paracetamol (PAR), ascorbic acid (AA) and acetylsalicylic acid (ASP) in pharmaceutical samples was carried out by using simultaneous use of discrete wavelet transformation (DWT) and afterward partial least squares |
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Viscozitatea si termodinamica debitului viscos al solutiilor binare de 2,5,8-trioxanonan
cu 1-propanol si 1- butanol
VASILE DUMITRESCU
|
| Viscosities of binary liquid mixtures of 2,5,8-trioxanonane (diglyme) with 1-propanol and 1-butanol were determined at 288.15, 293.15, 298.15, 303.15 and 308.15 K as a function of composition. The viscosities were used to test the relations of Hind, Grunb |
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Adsorbtia la echilibru a acidului glicolic pe carbune activ
Ismail Inci |
| This paper aims to present novel data of adsorption for the removal of glycolic acid from aqueous solutions by activated carbon. Experimental works were carried out in the system of aqueous glycolic acid solutions in four different concentrations (2 %, |
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| Caracterizarea eficientei bioreactoarelor cu amestecare mecanica. Timpul de amestecare pentru lichide de fermentatie aerate |
| The mixing time is one of the most useful criterion for mixing intensity of fermentation broths and for scale-up of biosynthesis processes. The value of this paper parameter depends mainly on the rheological properties of the broths, biomass concentratio |
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| Contributii la studiul transferului de caldura utilizand sisteme analog-numerice |
| The paper presents an analogue data acquisition systems characterized by a high number of inputs, conversion velocities, processing and storage facilities applied to the heat transfer in building materials, namely cellular and block concrete. Temperature |
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| Cristale lichide. 6. Studiul experimental al tranzitiei la faza de cristal lichid al unor mezogeni termotropi prin metoda difuziei luminii |
| A simple analytical system using light scattering (LS) method has been developed to determine phase transition temperatures of liquid crystals (LC). Intensity changes of the transmission light through a sample were measured as function of temperature. All |
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Determinarea acidului ascorbic din fructe folosind o metoda de tip Landolt
|
| Many fruits are rich sources of ascorbic acid. The content of vitamin C was determined by using a Landolt type system of redox reaction and a clock method. The reaction system was iodide-hydrogen peroxide-ascorbic acid. The method has been compared to tit |
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| Determinarea spectrometrica a vitaminei C din produse farmaceutice dupa stabilizare in tiouree |
| The ascorbic acid is an essential vitamin and it participates to many biological processes. It is a hydrosoluble, thermolabile vitamin, easily oxidizable in acid environment, in the presence of metal traces, light and oxygen. It cam be found in large quan |
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| Determinarea unor metale grele din ape uzate de la statia de epurare Brasov prin tehnici spectrometrice in plasma |
| Heavy metals represent one of the most important categories of pollutants for natural waters and wastewaters. Small amounts of metallic pollutants can cause extreme damages on environment quality. This work is a case study about heavy metals content dete |
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| Diminuarea coroziunii in crevasa prin utilizarea inhibitorilor in solutiile de curatire chimica |
| Samples of Iy-800 and SA 508 cl. 2, isolated or assembled in crevice-type devices, pre-oxidated or with deposits, have been chemically cleaned. The crevice-type devices were initially tested in aggressive environments whose concentration was established c |
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Electrozi modificati chimic cu polianilina pentru determinarea pH-ului solutiilor apoase
|
| Polyanyline (PAni) coated platinum, gold, glassy carbon (GC) and wolfram electrodes as indicator electrodes for hydronium ion (H3O+) have been studied. In principle, their potential response towards pH of aqueous solutions is quite similar with that of th |
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| Fractali si atractori stranii |
| The purpose of this work is to explain the notion of fractal and to illustrate it with examples from nature and science. It is then discussed the fractal dimension of natural fractal objects, using the concepts of fractal geometry. In order to determine t |
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| Mecanismul radiolizei difenilaminei (DFA) |
| Electron spin resonance spectra of free radicals formed in the radiolysis of diphenylamine have been recorded in solution as well as in polycristalline form. Two different radical species were found. Their thermal stability was investigated. An adequate m |
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| Optimizarea controlului calitatii vinului. I. Corelatii intre aciditatea musturilor si vinurilor si conditiile climatice |
| In the paper there are discussed the results obtained in the Wine Chemistry Laboratory from the Viti-Vinycol Research and Developping Station, Drăgășani-Vâlcea, concerning the determination of the titratable acidity and of the essential acidity (corrected |
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| Polibismaleinimido-eteri functionali |
| New functional poly(bismaleinimide-ether)s by Michael-type hydrogen polyaddition of phenolphthalein to flexible bismaleinimides followed by an alkaline hydrolysis under mild conditions have been synthesized. Linear polymers with triarylcarbinol sequence |
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| Separarea cuprului din solutii apoase diluate prin adsorbtie coloidala - flotatie |
| The paper presents the separation of copper from dilute aqueous solutions by flotation (dispersed-air flotation) using oleic acid as collector. Precipitate flotation and adsorbing colloid flotation, using expanded perlite and activated expanded perlite as |
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Sinteza si caracterizarea unor noi 5-<4'-(R1-2'' -tiocarbonilaminofenilen)> -3-tione-4-R2-1,2,4,-triazoli si 5-<4' -(R1-2'' -tiocarbonilamino-fenilen)>-2-arilamino-1,3,4-tiadiazoli
|
| New nitrogen and sulfur heterocyclic compounds were synthesized and charcterized. 4-Methoxycarbonyl-phenyl isothiocyanate contains two reactive groups: -NCS and -COOCH3. The isothiocyanato group reacted with benzimidazole, benzthiazole and pyrrole |
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| Sinteza unor saruri de amoniu ale acizior benzoici cu etanolamina, potentiali regulatori de crestere a plantelor |
| Some ammonium salts of the benzoic acids with ethanolamine were synthesized in order to obtain some potential plant growth regulators. It is well known that the existence of aromatic nucleus and a carboxylic group, or its functional derivatives, in a mole |
|
| Sinteza, caracterizarea si analiza conformationala a Me-, Pr-, respectiv i-Pr-calix<4>resorcinarenei |
Me-calix<4>resorcinarene, Pr-calix<4>resorcinarene and I-Pr-calix<4>resorcinarene were synthesized and their structures were confirmed by 1H-RMN, IR and UV spectroscopy, and by an computational study with AM1 semiempirical method.
Keywords:Me-calix<4>re |
|
| Studiu experimental asupra antrenarii cenusilor din haldele CET Isalnita |
| Quantitative data on flying ashes pollution in CET Isalnita as well as dust accumulation in the neighborhood area are reported as a results of dominant wind direction and other local weather conditions. Normal dust pollution level was used to range to the |
|
| Studiul calorimetric al cresterii Sacharomices cerevisiae |
| The Calvet microcalorimeter has been used to study the growth of Sacharomices cerevisiae. The growth thermogram was analyzed and the molar growth yield, catabolic activity and Km and Vm (from Michaelis - Menten kinetics) were determined. The results show |
|
| Studiul interactiei unor noi complecsi porfirinici ai Zn(II) si Cu(II) cu imidazolul |
| The latest outcomes of a study concerning the interaction of imidazole with a new series of Zn(II) and Cu(II) mono-hydroxyphenyl-mesoporphyrin complexes, 5-(x-hydroxyphenyl)-10,15,20-tris-phenyl-21,23-M(II)-porphine, where: x=2,3,4, and M=Zn, Cu have bee |
|
| Teoria Ghinzburg - Landau imbunatatita a tranzitiilor de faza lichid-cristale lichide |
| The paper presents the emphasizing way of phase transitions from liquid state to the three phases of liquid crystals, according to Landau-Ghinzburg theory. It is shown, on the basis of group theory, that liquid-liquid crystals transition is of first ord |
|
| Unele aspecte privind stabilirea dimensiunii corpurilor de macinare utilizate in morile cu tambur rotativ |
| The author presents the way to establish a relationship of calculation for the dimension of grinding media used in rotary mills. The numerical proportions which intervene in this relationship have different values, depending on many elements specific for |
|
| Analiza prin spectroscopie IR a uleiului din ficat de rechin |
| The following components were identified by IR spectroscopy studies: á,â - unsaturated compounds with even-number of C-atoms belonging to C18 omologue series, derivated carboxylate groups, á,â - unsaturated conjugated double-linked carboxylic products, sa |
|
| Cinetica de coroziune a otelului inox 304L a aliajului Incoloy 800 si a otelului carbon SA 516 in mediul circuitului secundar al generatorului de abur |
| The heat transport circuits of a nuclear power plant have different water chemistries, corrosion product sources, temperatures and flow rates and these parameters influence the growth and deposition of oxides with different compositions on the surfaces of |
|
| Degradarea termica a poliizobutilenei prin cromatografie de gaz de piroliza |
| Regarding the thermal degradation of polyisobutylene in inert medium, there are still some discordances on the yield of isobutene monomer evolved. The paper presents experimental data on the thermal degradation of polyisobutene studied by pyrolysis at t |
|
| Descriptori moleculari de flexibilitate pentru calcule QSAR |
| The flexibility evaluated by the molecular dynamics simulation is compared with the flexibility calculated using molecular descriptors. Unlike the molecular descriptors, the molecular dynamics simulation describes only in little measure the rotations arou |
|
| Determinarea cerintelor ecologice de apa in vederea conservarii ecosistemelor in mediul acvatic |
| The paper deals with the ecological water requirements, to assure the preservation and development of the ecosystems within the aquatic environment and riverane areas. Achieving each month the ecological water requirement, the author proceeds relying on t |
|
| Efectul elementelor de aliere asupra stabilitatii in medii agresive a unor aliaje de titan |
| The increase of the corrosion resistance of titanium in reduced acid solutions at high temperatures is obtained by the alloying with different metals. These alloying elements can reduce the titanium thermodynamic instability (nickel, molybdenum, wolfram), |
|
| Estimarea limitelor de detecție și determinare a Cu(II) și Ni(II) pe bază de calibrare, pentru sistemul analitic TLC |
| The limit of detection and limit of quantification are statistical estimates that are used to make the binary decision if the true concentration in a given sample is higher than zero or not. In most cases, limits are currently calculated on the basis of |
|
| Fractia de goluri in coloane cu barbotare. II. Influenta conductivitatii electrice a fazei continue |
| This paper studies the influence of continuous phase electrical conductivity on overall gas hold-up in a bubble column using air-electrolyte solutions as dispersed system. Experimental results showed the existence of a critical value of electrical conduct |
|
| Influenta originii materiei prime asupra hidrodesulfurarii adanci a combustibililor Diesel |
| Three gas oils having the same boiling range but obtained from different crude oils were submitted to deep hydrodesulfurization. A commercial NiMo catalyst was used. The total content of sulfur in gas oil was determined using X-ray fluorescence. Quanti |
|
| Influenta parametrilor in sinteza 2-cloroetilfosfonatului de bis(2-cloroetil) |
| 2-Chloroethylphosphonic acid is one of the most important phosphorus compounds used in agriculture as plant growth regulator and is the active part in products of ETHREL type. It may be obtained by hydrolysis of 2-chloroethylphosphonic acid dialkylester |
|
| Membrane poliuretanice cu zeolit SAPO-5 încorporat. I Preparare și caracterizare morfologică |
| SAPO-5 zeolite has been used for modifying the structure of polyurethane (PU) membranes and improving their properties. Polyurethane solutions were selected as organic network and a series of membranes, with content of zeolite varying between 10 and 70 wt |
|
| Planificarea optima simultana pe termen scurt si pe termen lung a instalatiilor multiscop |
| Planning and scheduling of the multipurpose plants are close correlated. The planning of the product amounts is imposed by market demands, but in the same time depends on the plant exploitation strategies. A good scheduling will result in obtaining of inc |
|
| ReacTia 3,5-di-t-butil-4-benzochinonimine cu dimetilfosfit |
| Condensation of 2,6-di-t-butyl-1,4-benzoquinone with substituted anilines gives N-aryl-2,6-di-t-butyl-1,4-benzoquinoneimines; further condensation of these compounds with dimethylphosphite afforded two types of products, 4 and 5, according to the struct |
|
Semicarbazone si tiosemicarbazone in seria 8-R-triciclo / 7.3.1.02,7 / tridecan-2-ol-13-onei,
substante cu potentiala activitate biologica
|
| Semicarbazones and thiosemicarbazones of 8-R-tricyclo/7.3.1.02,7/tridecane-2-ol-13-one (where R=H, CH3 or C6H5) were obtained in good yields. The corresponding thiosemicarbazones were treated with maleic anhydride and derivatives of 5-carboxymethylthiazol |
|
| Studii privind formarea, caracteristicile si proprietatile suprastructurilor adiacente electrodului polarizat |
| The supramolecular structural area, adjacent to the polarized electrode, is associated to a spatial charge. This artificial overstructure (ionic crystal type) is stabilized by charge transfer processes (CT), it preserves the charge of the generating elect |
|
| Studiu RES privind radioliza poliacrilamidei |
| The radiolysis mechanism of polyacrylamide under ă exposure was studied by ESR investigation at two temperatures, 77K and room temperature. Initially, polyacryamide samples presented various degrees of hydrolysis in order to depict the influence of diff |
|
Adeziv pe baza de alumina coloidala pentru corpuri ceramice
Iuliu Radu Gabrus, Ioan Bujor Pancan, CAMELIA CAPATANA, ADINA MARIA BODESCU |
| An adhesive used in the industry of manufacturing car windscreens was obtained from colloidal alumina (1% weight), ethilene glycol (1 3 % weight) and polyvinyl alcohol (0,1 0,5% weight). The mixture was homogenized by stirring and concentrated by heati |
|
| Aniversare: Prof. Dr. Ing. Petru Balta la a 75-a aniversare |
|
|
Calculul dozei debit produsa de o sursa filiformă cilindrica
si o sursa sub forma de disc circular
Andrei Dobrescu, Mihail Contineanu |
| It was developed the basic formulae for the calculation of the dose rate of a two gama radiation source: a disc circular source of small thickness and a line source. It was calculated the dose rate in an arbitrary point and neglecting attenuation, buildu |
|
Caracterizarea materialului membranei unui electrod
tiocianat-selectiv pe baza de clorura de
<5,10,15,20-tetrafenil-21H,23H-porfirinat-N21,N22,N23,N24> rodiu(III)
DANA VLASCICI, EUGENIA FAGADAR-COSMA, OTILIA SPIRIDON-BIZEREA, AURELIA PASCARIU, ADRIA |
| The aim of this paper, in connection with previous studies about natural metalloporphyrins <1,2>, is focused on the synthesis and characterization of meso-tetraphenylporphyrinato rhodium (III) chloride- (ClRhTPP)- by UV-Vis, FT-IR and 1H-NMR spectrometr |
|
Cercetari asupra continutului de taninuri
din Rhododendron Kotschyi
CECILIA GEORGESCU, IULIANA BRATU, MIRCEA TAMAS |
| The tannnins in the flowers and leaves of Rhododendron Kotschyi were studied by thin layer chromatography. It was also measured their total dosage and identification reactions were effected. On this basis it was established the nature of tannins from thi |
|
ChemFET calciu selectiv pentru determinari clinice
si de protectie a mediului
ELENA RUSE, EUGENIA TOTU, ANA MARIA JOSCEANU |
| This work evidences the possibility of using devices as ChemFETs as ionic sensors. The calcium selective sensors were obtained by embedding electroactive components into polyimide polymeric matrix and subsequent deposition onto the dielectric gate of a m |
|
Contributii privind studiul comportamentului unor tincturi de Salvia officinalis L. in camp electric
CARMEN TOPALA, BENEDICT OPRESCU, ELIZA OPREA |
| It is presented the behaviour of some active vegetable extracts from Salvia officinalis in an electrical field. The experimental study of transport processes was performed by relaxation time determination, using the depolarization of the electrolytic c |
|
Electrodepunerea PbO2 si a PbO2 Co-dopat pe suport de otel inoxidabil si caracterizarea sa electrochimica in mediu acid
Florica Manea, Joop Schoonman, Ciprian Radovan
|
| The electrodeposition of Co-doped PbO2 on stainless steel as support was investigated with the aim of producing electrodes with improved catalytic activity. The electrodeposition conditions (current densities, hydrodynamic conditions, time, bath composi |
|
Eliminarea unor coloranti din solutii apoase prin procedee de oxidare catalitica
Sorin Marius AVRAMESCU, Corina BRADU, Marian NEATA, Ion UDREA |
| The presence of dyes in waters perturbs the aquatic ecosystem due to changes in the degree of illumination of the water. This leads to the decline of the photosynthetic processes and to the decrease of the capacity of waters self-epuration. The dyes in wa |
|
Fosforilarea derivatilor compusilor hidroxilici aromatici in sisteme multifazice
Gheorghe Ilia, Stefan Bilan, Adriana Popa, Smaranda Iliescu, Lavinia Macarie, Nicoleta Plesu |
| Phenol was phosphorilated in biphase systems, using two methods. A comparative study was performed. When liquid- liquid system was used, the results were weaker. The best results were obtained when solid-liquid system was used. This method is the easiest |
|
Interactiunea ionilor de plumb si cadmiu cu
unele componente din formulele detergentilor in conditii de spalare.
I. Schimbul de ioni la zeolitul de Na
GABRIELA CILINCA, MINODORA LECA
|
| Ion exchange of individual lead and cadmium and their mixtures at Na-zeolite HAB A40 in distilled and synthetic hard water (10 and 16od) in washing conditions (stirring, contact time 30 min, pH 10) was studied. It resulted that strongly selective lead io |
|
Noi contributii la sinteza catalitica a dimetileterului si utilizarea sa drept carburant pentru motoare ecologice
GRIGORE POP, RODICA GANEA, NATALIA NATU, CATALINA MARINESCU, CONSTANTIN PANA, NICULAE NEGURESCU, MARCEL GINU POPA, GABRIEL BOBOC, ALEXANDRU |
| Dimethyl ether (DME) is identified as a clean new alternative fuel for diesel engines. DME can provide very low emissions and totally smokeless diesel engine operation. Some experimental investigations of the DME fueled diesel engine D2156 MTN8 carri |
|
Noi derivati de tetrahidroacridina derivand de la acidul
1,2,3,4-tetrahidroacridin-9-carboxilic
Madalina Hrubaru, Bogdan Draghici, Marieta Plaveti, Florin Dinu Badea |
| Twenty new substituted 1,2,3,4-tetrahydro-9-(N-aryl)-acridin-carbamoylamides were obtained in good yields by condensation of acid chloride of 1,2,3,4-tetrahydroacridin-9-carboxylic acid with the corresponding substituted anilines. The structure of the co |
|
Obtinerea principiilor active din uleiul de scortisoară
Vasile Pode, Adrian Rus |
| It has been investigated the separation of high purity cinnamaldehyde from volatile oils of Cinnamomum Zeilanicum using original metal packings with high efficiency in the distillation column. The resulting fraction and compounds have been analysed by ga |
|
Oxidarea anilinei pe un anod oxidic
Ioan Roman, Corina Vlad, Petru Nita |
| The paper presents the results obtained by anodic oxidation of aniline from residual water on a tin dioxide base ceramic electrode compared with the aniline oxidation on a platinum anode. The oxide anode consists of the SnO2-Sb2O3-CuO system and was obtai |
|
Posibilitati de inhibare a coroziunii otelurilor in solutii de electroliti
SILVIU JIPA, LAURA MONICA GORGHIU, CRINELA DUMITRESCU, RADU OLTEANU,
TRAIAN ZAHARESCU |
This paper presents the compensation effects found in some polyolefins such as: LDPE, LLDPE, HDPE, UHMW-PE, i-PP, EPDM and EPR. For the evaluation of the activation parameters, the isothermal chemiluminescence method has been employed.
Keywords: compensa |
|
Posibilitati de inhibare a coroziunii otelurilor
in solutii de electroliti
MARIA MORARU, MARIA NEGOIU, ALEXANDRA SCHIOPESCU |
he paper presents the behaviour of Nalignosulphonte (LGS) in inhibiting the corrosion of G 105 and P 105 steels in aqueous KCl and NaCl solutions. Weight loss measurements show that LGS is the corrosion inhibitor.
Keywords: corrosion, NaCl and KCl solut |
|
Principii metodologice pentru evaluarea obiectelor de patrimoniu din piele si pergament (I)
Lucretia Miu, Maria Giurginca, Petru Budrugeac3, Nicoleta Iftimie, Aurelia Meghea |
| Scientific researches performed by modern techniques on art works is compulsory in order to acquire knowledge and to evaluate the national and universal patrimony. In the same time, this is a sine qua non condition for the perenniality of the art works, m |
|
Procedeu empiric imbunatatit pentru predictia deplasarilor chimice 13C-RMN ale alchenelor si polienelor aciclice cu duble legaturi izolate
FRANCISC POTMISCHIL |
An improved empirical computation procedure, enabling accurate prediction of the complete 13C NMR chemical shifts (sp2 and sp3 carbons, as well) of acyclic alkenes and also of acyclic polyenes with isolated double bonds, is described.
Keywords: 13C NMR, |
|
Procesul analitic
Analistul de sistem
Adriana-Mihaela Stoica, George-Emil Baiulescu |
The analytical process includes three steps: sampling (40%), analysis (20%) and data processing (40%). The system analyst must be included as a main part of the analytical control process. Capability, correctness and creativity must characterize a good |
|
Selectia colectorului in flotatia ionica
Ligia Stoica, Gabriela Carmen Oproiu |
The paper is focused on the selection of the collector in ion flotation, based on the surface properties.
The tensioactive properties of aqueous solutions of cationic type collectors: dodecylamine, dodecyltrimetilamonium chloride, and anionic type colle |
|
Simularea procesului de acumulare a ionilor de sodiu, clor si fier în crevasele generatorului de abur CANDU
GHEORGHITA JINESCU1, ALEXANDRU WOINAROSCHY, DUMITRA LUCAN |
| The aim of the paper consists in the simulation by an adequate mathematical model of the Na, Cl and Fe ions concentration process into crevices of CANDU steam generator. The model considers all the processes that interfere into the ions concentration mec |
|
Simularea unui reactor de combustie catalitica a metanului in strat fluidizat
MAGDALENA BOSOMOIU, GRIGORE BOZGA, IOSIF NAGY |
| A simulation study of the methane combustion in fluidized bed reactors is presented. The process description, based on the two-phase model, accounts for the influences of internal and external mass transfer around the catalyst grain on the process kinet |
|
Sinteza si caracterizarea 1H-3-metil-4-etoxicarbonil-5-arilidenhidrazino-pirazolilor 1, intermediari in sinteza
1H-3-aril-6-metil-pirazolo<5,1-c><1,2,4>-triazolilor 2
VASILE-NICOLAE BERCEAN, VALENTIN BADEA, MARIA ILICI, ION NEDA, CAROL CSUNDERLIK |
| H-3-methyl-4-ethoxycarbonyl-5-arylidenhydrazino-pyrazoles, obtained by the direct reaction between 1H-3-methyl-4-ethoxycarbonyl-hydrazino-pyrazole hydrochloride and substituted benzaldehydes in anhydrous alcoholic solution, are useful intermediates in pre |
|
Sinteza, structura si culoarea unor cromogeni
2-hidroxiazometinici termosenzitivi
VALENTIN RADITOIU, LUMINITA WAGNER, ALINA RADITOIU, NICOLETA GRIGORIU, CORNELIU TARABASANU-MIHAILA |
| The article presents experimental data regarding some azomethine dyes synthesized by condensation of 5-amino-1,3-dihydro-2H-benzimidazole-2-one and hydrazine, respectively with 1-formyl-2-hydroxybenzene or different 1-formyl-2-hydroxynaphtalene derivative |
|
Studiul analitic al unor noi complecsi ai Ni(II)
cu dioxime asimetrice
DANIELA CIRTINA, ION GANESCU |
| The dioximic structures make up the study subject of many researches regarding their analytic capacity of application, a very interesting and also a very thoroughly examinated field. In this work there were presented the results of a structure study f |
|
Studiul stabilitatii în timp a unor standarde de vapori de mercur in aer si modalitati de purificare a aerului de urmele de mercur
MARIA-CRISTINA BRATU, ANDREI-FLORIN DANET, ADRIAN BRATU |
| It was developed a non dispersive CVAAS mini-analyzer for mercury vapors determination in atmospheric air based on the absorption of mercury line at 184.9 nm. In order to calibrate the mini-analyzer it was developed a methodology for preparing mercury v |
|
Sudarea cu laser a unor oteluri inoxidabile utilizate la instalatii de proces din industria chimica (I)
OCTAVIAN DONTU, STERGIOS GANATIOS, MIRCEA COVRIG |
The paper presents a study on the improved laser weldability of a duplex stainless steel used in chemical plants.
Keywords: laser welding, stainless steel, chemical plants |
|
Compusii de incluziune ai ciclodextrinelor
CONSTANTIN LUCA, ANA-MARIA GRIGORIU
|
| The present paper is a short review of the most important information concerning the preparation, the structure and the properties of cyclodextrins as well as those of their inclusion compounds. Their main applications in the chemical, pharmaceutical, foo |
|
Determinarea spectrofotometrica simultana a bromurii
de clorodiazepoxid si clidina in comprimatele filmate prin metoda celor mai mici patrate,
prin regresia componentului principal si a retelei artificiale neutre
Erdal Dinç, Saadet Dermi, Dumitr |
| Multivariate spectrophotometric approaches based on namely partial least squares (PLS), principal component regression (PCR) and artificial neural network (ANN) were proposed for the simultaneous determination of chlordiazepoxide (CHP) and clidinium bromi |
|
, Comportamentul feromagnetic
al metil celulozei pirolizate
Wilhelm Kappel, Silviu Jipa, Radu Setnescu, Traian Zaharescu, Calin Oros
|
| The clear hysteresis in the magnetization was observed on the pyrolytic product obtained from methyl cellulose pyrolysis at 6000C. XPS measurements have been also performed. The large number of unpaired electrons on the graphite-like structure seems to pl |
|
Acoperiri de conversie pe aluminiu cu încorporare de ioni
ai Mo, W sau pamanturilor rare alternative ecologice
LIANA ANICAI, AURORA PETICA, TEODOR VISAN, MIHAI BUDA, ADRIAN CRISTIAN MANEA
|
| Several chemical conversion (CC) coatings on aluminum substrates, based on incorporation of Mo, W or Ce ionic species, have been investigated in order to select a Cr-free procedure for passivation. Mo- and W-rich layers were deposited using hot solutions |
|
Analiza unor parametri fizico-chimici si microbiologici
ai apelor in scopul determinarii gradului de poluare
CRINA TURCAS, CRISTIAN TOMA, STEFAN PUSCA, ELISABETA CIOCAN
|
This paper presents three methods to determine some physical, chemical and microbiological parameters of waters, in order to define the degree of pollution. The experiments performed lead to the exact assessment of the water quality category.
Keywords: |
|
Decelarea falsificarii uleiurilor vegetale pe baza compozitiei acizilor grasi determinata prin cromatografie de lichide de inalta
performanta cu faza inversa (RP-HPLC)
ERSILIA ALEXA, MARIANA POIANA, CAMELIA PEEV, CRISTINA DEHELEAN
|
| Substitution or adulteration of expensive vegetable oils with a cheap oil is a major economic fraud which can have severe health implications. Various physical and chemical tests have been proposed to establish the authenticity of vegetable oils, to detec |
|
Degradarea prin coroziune a structurilor din beton armat
2. Contributii la studiul mecanismului de degradare a structurilor din
beton armat care functionează în medii electrolitice naturale
IOSIF LINGVAY
|
| The corrosion degradation of concrete steel structures and the repair costs of corrosion-caused damages have been analyzed. Also, the accelerating factors and the degradation mechanisms of underground steel rebars from reinforced concrete structures have |
|
Determinarea numarului redox a unor sticle obtinute
din deseuri recuperate
Camelia Capatina
Cristinel Racoceanu
|
| The paper presents the importance of the glass cullets recovery by reducing the energy consumption and raw materials in industry. The melts were made in laboratory, into an electric oven, in alumina crucibles, at 14500C, for 3 hours. The rebaking of the s |
|
Determinarea unor
microelemente în vinurile din zona viticolă a Dealurilor Moldovei
Jeni Carla Done, Anca Iulia Stoica, Valeriu V. Cotea, George Emil Baiulescu, Petre Capota
|
| Many wines in North-East of Romania were characterized in relation to the micro and trace elements pattern. Determination of such elements in different types of wine, most probably depending on their content in soils, allows sort differentiation, identifi |
|
Dimetileterul, un combustibil alternativ într-o pila de combustie directa cu membrana schimbatoare de protoni
Maria Ileana IONITA, Niculae ENE
|
| The electrooxidation of dimethylether (DME) in a direct fuel cell in the presence of O2 from air is a complex process, mainly influenced by the cathode nature and ion exchange membrane permeability. The tests carried out using a palladized Pd as anod and |
|
Efectul tratamentelor de emoliere asupra comportarii
la imbatranire a pieilor muzeale (III)
Lucretia Miu, Maria Giurginca, Aurelia Meghea
|
| In order to restore various museum objects and to find appropriate types of leather, so that to be compatible to the original material, some samples of leather coming from different animal sources (cow, goat and sheep) have been studied. The new tested ma |
|
Electroforeza proteinelor, o importanta metoda
in diagnosticul de laborator clinic
DANA STAN, CARMEN MIHAILESCU, CODRUTA PARASCHIVESCU, ELIZA OPREA, ION BACIU,
ILEANA CORNELIA FARCASANU,
|
| This paper describes here a reproducible and rapid serum protein electrophoresis on agarose gel that provides accurate identification of six major fractions in human serum. Quantitation of the six major serum fractions was done by gel scanning analysis. C |
|
Interactiunea ionilor de plumb si cadmiu cu unii componenti din formulari detergente în conditii de spalare
4. Ioni de plumb si cadmiu în solutii de detergenti
cu si fără perborat de sodiu
GABRIELA CILINCA, MINODORA LECA,
|
| Removal of Pb ions from detergent solutions with or without sodium perborate is practically complete when water durity ranges from 0-10od. In distilled water, individual Cd ions are removed 80-90%, depending on the detergent concentration. In water with d |
|
Interpretarea cuanto-moleculara a tranzitiilor electronice ale complecsilor Ni(II) si Co(II) cu
6-fenil-3-ciano-4-trifluorometil-piridin-2(1H)-tionă
Aurora Reiss, Costinel Lepădatu, Angela Kriza
|
| The present paper deals with the assignment of the absorption bands occuring in the electronic spectra of the Ni(II) and Co(II) complexes with 6-phenil-3-ciano-4-trifluoromethyl-pyridine-2(1H)-tione(LŽH). To this purpose, EHT-MO calculations were performe |
|
LEGISLATIA UNIUNII EUROPENE DIN DOMENIUL MEDIULUI
SISTEMELE FRIGORIFICE SI LEGISLATIA UE
GRATIELA - MARIA TARLEA |
|
|
Modelarea statistica a influentei timpului de stationare
în sol a agentilor poluanti compusi organici volatili
asupra procesului de depoluare prin ventilare
Gabriela-Alina Brusturean, Delia Perju, Jean Carré, Dana Silaghi-Perju, Doru Dumitrel
|
1 Universitatea Politehnica Timișoara, Piața Victoriei, Nr. 2, 300006, Timișoara, Romania,
2 Université Claude Bernard Lyon 1, Laboratoire dApplication de la Chimie à lEnvironnement (LACE), 43, Boulevard du 11 Novembre
1918, 69622 Villeurbanne Cede |
|
Nitrozarea pirazolo<5,1-c><1,2,4>triazolilor
VASILE-NICOLAE BERCEAN, VALENTIN BADEA, MARIA-DANIELA SOFEI, DANIELA MITROI, CAROL CSUNDERLIK
|
| Nitrosation of the 1H-6-methyl-3-phenyl-pyrazolo<5,1-c><1,2,4>triazole 1 with sodium nitrite in hydrochloric acid, leads to 1H-7-hydroxi-imino-6-methyl-3-phenyl-pirazolo<5,1-c><1,2,4>triazole 3d, while the nitrosation of the 1H-7-etoxicarbonil-6-methyl-3- |
|
Obtinerea si caracterizare unor octameri ciclici
din clasa calixarenelor
I. para-Tert-Butilcalix<8>arena
ZOIA CRISTU, MARIANA MATEESCU, SANDA DONCEA, STEFANIA DUMITERSCU, IULIAN STANCIU
|
| A laboratory proceeding (method) for obtaining para-tert-butylcalix<8>arene by para-tert-butylphenol with formaldehyde condensation in basic catalysis ( aqueous solution of sodium hydrate) has been achieved using xylol solvent.The condensation has been ac |
|
Proprietățile optice ale PbS-CdS multistratificate
și ale filmelor subțiri de (CdS + PbS) depuse pe suport de sticlă prin piroliză de pulverizare
Violeta Popescu, Horea Iustin Nascu, EUGEN DARVASI
|
| Two kinds of films containing both PbS and CdS were obtained by spray pyrolysis. The first one, sandwich type, consisting on 2-6 layers, was obtained trough the successive deposition of CdS at 450oC, and PbS at 400-425oC, from solutions containing eithe |
|
Rearanjarea generată electrochimic a radicalului liber 2-feniletil
SANZIANA ROSCA, GABRIELA STANCIU, RALUCA STAN, MIHAELA UNGUREANU SORIN I.ROSCA, SHUNTARO MATAKA
|
| The Kolbe oxidation of 2-13C-phenylpropionic and 2,2-D2-3-phenylpropionic acids showed the scrambling of 13C (or deuterium respectively) between positions 1-4 in the free radical coupling product - 1,4-diphenylbutane. This result (provided by 1H- 13C-NMR |
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Separarea eritromicinei prin pertracție liberă și facilitată
DAN CASCAVAL, ANCA-IRINA GALACTION, NICOLETA NICUTA
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| In paper, the separation of erythromycin by non-facilitated and facilitated pertraction using di-(2-ethylhexyl) phosphoric acid (D2EHPA) as carrier has been studied. For the two pertraction systems, the influences of the main process parameters (pH-value |
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Sistem electrochimic de testare accelerata pentru desprinderea catodica a acoperirilor pentru conducte îngropate
Danut-Ionel Vaireanu, Mirela Stanciu, Simona Caprarescu
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| This paper presents the manufacturing of a device used for an accelerated testing for cathodic disbounding of pipeline coatings, device that observes and complies with the specifications of ASTM G8-96/USA standard and substantially reduces the testing per |
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Tehnici de caracterizare a arilazofosfonaților
RAMONA MOLDOVAN, SIMONA GABRIELA MUNTEAN, GEORGETA MARIA SIMU, BIANCA MARANESCU, AURELIA PASCARIU
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| In the paper some methods for the characterization of a series of arylazophosphonates compounds are presented. The studied compounds were obtained by the N-P coupling reaction of different diazotized aromatic amines, with dialkylphosphites. The obtained c |
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The Study o f Tocopherols from Different
Sea Buckthorn and Wheat Germ Extracts
LAURIAN VLASE, NELI OLAH, ANGELA MARCULESCU,
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| The sea buckthorn fruits are rich in vitamins C and E, fatty acids and sterols, carotenoids, polyphenols, flavonoids having antioxidant action, which is very important for health. The oil obtained from wheat germs is rich in vitamins E and has antioxidant |
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| Coloranti azoici derivati ai acidului 4-amino-5-hidroxi-2,7-naftalendisulfonic |
| The paper presents a class of mono- and dis- azo dyes, derivatives of 4-amino-5-hydroxy-2,7-naphtalenedisulfonic acid (cH acidc). These dyes were obtained by the azo coupling reaction of cH acidc with the diazonium salt of primary aromatic amines, in |
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| Cuantificarea stresului oxidativ in biosisteme 1. Testarea prin chemiluminescenta a activitatii antioxidante a unor molecule de interes biologic |
| The paper investigates by chemiluminescence technique the antioxidantive activity of some essential aminoacids. As light emitting systems, radiolized acridine and luminal have been used. The tests have been extended on peroxidated proteins with various |
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| Determinarea glucozei prin chemiluminescenta folosind un sistem FIA |
| A flow injection system and a method for the glucose chemiluminescence determination in various samples are described. The flow injection system consists of a peristaltic pump with four channels, an injection valve with six ways, a flow cell and a chemilu |
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| Echilibre de faza la presiune inalta pentru sistemele dioxid de carbon + metanol si dioxid de carbon + izopropanol |
| High-pressure vapor-liquid equilibria (VLE) are measured for binary mixtures of carbon dioxide + methanol and carbon dioxide + isopropanol systems. Isothermal (P-x) data is presented for carbon dioxide + methanol at 298.15 and 310.15 K and pressures up 7 |
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| Extractia metalelor neferoase grele cu acizi naftenici |
| In this paper has been studied the extraction of some nonferrous metals by naphtenic acid through the equilibrium moving method. As a dillutant, white spirit was used. The results have also established the dependence of distribution coefficients of copp |
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| Influenta continutului de cocs remanent asupra performantelor catalizatorului de cracare aditivat |
| This paper presents the influence of remanent coke content in one industrial catalyst USY type single and additived with a shape selective zeolite MCM-22 (synthesised by authors) for the increasing of gas production, required as components of ref |
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| Influenta metodelor de sinteza asupra structurii compusilor perovskitici de tipul SrxCa1-xCeO3 |
| The SrxCa1-xCeO3 compounds were obtained by ceramic and sol-gel methods. The compounds obtained by ceramic method were sintered in air atmosphere at 1200oC, while the compounds obtained by sol-gel method were sintered in air atmosphere at 1000oC. The samp |
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| Influenta tratamentelor suprafetei metalice asupra comportarii la coroziune a interfetei metal / pelicula organica |
| This paper presents the results regarding the influence of the metallic surface treatments on the corrosion behaviour of the metal/organic film interface. Electrochemical impedance spectroscopy (EIS) and stepwise polarisation have been used. The measureme |
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| Intensificarea transferului de masa al oxigenului in bioreactoarele cu amestecare mecanica prin utilizarea oxigen-vectorilor |
| The oxygen mass transfer represents the most important parameter implied on the design and operation of mixing-sparging equipment of the bioreactors. It can be described and analyzed by means of mass transfer coefficient, kla. The kla values are affected |
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| Saruri de amoniu ale acidului abietic, acizi biodegradabili activi de suprafata, cu actiune antimicrobiana |
| The paper presents the preparation of anionic surfactants by the reaction of abietic acid with aliphatic amines (isobutilene di-izobutilene) and ethanolamine (mono, trietanolamine) in acetone as solvent. These derivates were purified and characterized via |
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| Sinteza si caracterizarea unor noi cavitanzi fosforilati pe baza de calix<4>resorcinarene |
| As a result of C-ethyl-calix<4>resorcinarene and C-phenylethylene-calix<4> resorcinarene with dichlorophenylphosphinoxide,in basic medium, two new calix<4> rezorcinarene derivatives functionalized in bridge with organophosphorus groups have been obtained. |
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| Studiu comparativ intre compresorul Roots si un nou tip de compresor |
| In this paper, the computation relation for volumic flow discharge is established depending on the geometrical elements and work parameters for each compressor type. In hypothesis of many constructive options for the same numbers of rotation rotor and |
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| Studiu privind optimizarea reactiei de fixare a acidului 4-amino - 3-iodo benzoic pe suport solid sub actiunea microundelor |
| This paper reports the possibility to use the microwave to attach the small molecules, like 4-amino-3-iodo benzoic acid, in a very short time (3 min), onto the polymeric resin Rink Amide - Fmoc. This strategy may be used to increase the diversity of a com |
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| Studiul inhibarii coroziunii otelului-carbon cu etilentiouree (ETU) in solutie de clorura de amoniu utilizand spectrometria Mössbauer |
| The inhibiting effect of ETU has been studied regarding the corrosion of carbon-steel in NH4Cl 0.1M solution at 25°C and 50°C. The effects of the inhibitor have been demonstrated using weight loss and electrochemical measurements as well as Mössbauer spec |
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| Studiul procesului de absorbtie a CO2 in solutie de K2CO3 cu promotori |
| In this paper was studied the intensification of the absorption process in pilot type columns in the presence of the reaction promoters. The absorption column was 1500 mm in height, 80 mm in diameter and was filled in 15 mm ceramic balls. The computer ha |
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Adsorbtia dinamica a dioxidului de sulf pe zeoliti Y
Modelarea matematica a curbelor de adsorbtie
MIRELA MARCU, IOAN-CEZAR MARCU, IOAN SANDULESCU |
| Sulphur dioxide adsorptive and kinetic properties of two Y type zeolites are investigated. Experimentally obtained breakthrough curves are compared with the calculated curves using Bohart Adams model. Modelling results show good agreements with the expe |
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Aspecte ale curgerii in sisteme aer lichide viscoelastice
MIHAELA MIHAI, IRINA PINCOVSCHI |
| The bubble motion in non-Newtonian fluids plays a major role in many industrial processes. This study provides new insights into the flow of viscoelastic fluids (polyacrilamide solutions) in bubble columns equipped with porous plates, by means of photogra |
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Calculul dozei radiatiilor gama in interiorul unei surse de forma unui cilindru gol
MIHAIL CONTINEANU, ANDREI DOBRESCU, IULIA CONTINEANU |
It was developped the basic formula for calculating the dose in inner of gamma radiation source of empty cylinder shape. The dose rate was calculated in a arbitrry point neglecting attenuation, buildup factor and self absorbtion.
Keywords: energy, dose r |
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Caracterizarea unor minerale argiloase in scopul folosirii lor pentru indepartarea ionului amoniu din ape reziduale
FLOAREA MANEA, ROXANA BADULESCU, CAMELIA CAPATANA |
| The possibility of using clay minerals in order to decrease the ammonium content from waste waters has been studied. For this purpose, it is determined the capacity of ionic exchange of two types of clay minerals and chaolin from a solution of electrolyte |
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Coloranti directi derivati ai 4,4'-diaminobenzanilidei. II. Sinteza si evaluarea proprietatilor tinctoriale ale unor coloranti disazoici cu structura asimetrica
Georgeta Maria Simu, Simona Gabriela Hora, Maria Elena Grad, E. N. Sisu |
| The synthesis of three disazo dyes with asymmetrical structure derived from 4,4'-diaminobenzanilide is presented. Salicylic acid, 6-amino-4-naphtol-2-sulphonic acid, 6-benzoylamino-4-naphtol-2-sulphonic acid and 7-amino-4-naphtol-2-sulphonic acid were use |
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Constructia si determinarea caracteristicilor analitice ale unui biosenzor potentiometric pentru glucoza
AURELIA-MAGDALENA PISOSCHI, ANDREI-FLORIN DANET |
| The aim of this paper is to study the characteristics and performances of a potentiometric enzyme electrode for the analysis of glucose; glass electrodes were used for the preparation of enzyme-pH electrodes, by entrapping the enzyme (glucose oxidase) on |
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Determinarea alcaloizilor totali din Atropa belladonna
si Lupinus sp. prin diferite metode spectrofotometrice si gravimetrice
IOSIF IANCULOV, IOSIF GERGEN, RADU PALICICA, MONICA BUTNARIU, DELIA DUMBRAVA, LAURA GABOR |
| Extracting and dosing total alkaloids from Atropa belladonna and Lupinus sp. is critical due to their physiological effect on neurological and muscle system. In the case of Atropa belladonna, quantifying tropanic alkaloids is done using a colorimetric met |
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Determinarea metioninei din produse farmaceutice utilizand reacția de oxidare cu permanganat de potasiu
SIMONA BUNGAU, LUCIAN COPOLOVICI, IOAN BALDEA, ILDIKO SZABO |
| Between the 22 natural amino acids, methionine is a tio-aminoacid. A kinetic method is described for micro-quantitative determination of methionine, based on redox reactions, between methionine and potassium permanganate. The reaction is studied spectro |
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Efetcele radiatiilor ionizante asupra principalilor radicali liberi benefici din Spirulina Platensis
STEFAN MANEA, VIORICA TAMAS, ELENA MAZILU, CRISTIAN TANASE, SILVIA SETNIC, DANA ENULESCU, NORA RĂDULESCU, MIRELA BRASOVEANU, MONICA NEMTANU, RADU MINEA |
| Spectrometric, GS-MS (gas chromatography mass spectrometry) and HPLC (high performance liquid chromatography) methods were used in the analytical determinations to establish the effects of ionising radiation on the main free radical scavengers (C Phycoc |
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Eliminarea 2-nitrofenolului din ape prin ozonizare catalitica cuplata cu adsorbtia pe carbune activ
ION UDREA, CORINA BRADU, SORIN MARIUS AVRAMESCU |
| This paper presents the results obtained from a process, which combines two techniques: catalytic ozonation and adsorption on activated carbon granules for the removal of 2-nitrophenol persistent organic pollutant from water. The experiments were carr |
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Influenta procesului de delimitare asupra caracteristicilor fotodetectorilor pe baza de PbS
VIOLETA POPESCU |
| Photoconductive PbS thin films deposited on glass substrate by Chemical Bath Deposition (CBD) must be delimited for obtaining the suitable configuration. It was applied a photolithographic method using a positive photoresist AZ 1350. The influence of reag |
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Metode neconventionale pentru sinteza porfirinelor
RODICA MARIANA ION, FLOREA SCARLAT |
| The porphyrins and related compounds occur an important place into the present high-technologies, practical not existing any area where such compounds to be used. In spite of their high price and the preparation difficulties, despite the fact that porphyr |
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Modelarea functionarii acumulatorului plumb-acid sulfuric
in sisteme de conversie a energiei regenerabile
II. Modelarea acumulatorului utilizat ca
unitate de stocare a energiei
IRINA NITA, OLGA IULIAN, DAN MANDALOPOL |
| Models for lead-acid battery operation simulation in renewable energy systems are presented. An improved model is proposed. The equations of the model are normalized in order to allow comparison between batteries of different size. The model is validated |
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Noi derivati de pirolo<2,1-a> ftalazina prin reactii de cicloaditie
1,3-dipolară. I
FLOREA DUMITRASCU, CONSTANTIN DRAGHICI, ANDREI BADOIU, DENISA DUMITRESCU, DELIA CAPRAU, DANIELA VULUGA |
| The 2-methoxycarbonylmethyl phthalazinium bromide (6) and dimethyl, diethyl or diisopropyl esters of acetylenedicarboxylic acid gave, in the presence of triethylamine and tetrakis-pyridino cobalt dichromate pyrrolo<2,1-a>phthalazine derivatives 10a-c. The |
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Prevederea calitatii vinului rosu pe baza corelatiei
dintre continutul de zaharuri si de antociani din struguri
LUOANA PASCU, LUMINITA VLADESCU |
| In this paper is proposed a method used to predict the qualitz of a red wine based on the correlation between the saccharates and anttrocyans contents in grapes from which the wine is obtained. For this purpose it was determined the anttrocyans content fr |
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Rolul aciditatii asupra curbelor de polarizare in electrooxidarea mediata a fenolului cu Co3+/2+
CARMEN MONICA GONCEA |
The paper presents the polarization curves for the mediated electrooxidation of phenol with Co3+/2+ redox system at platinum anode in H2SO4 aqueous solution. It was studied the effect of t of H2SO4 concentration upon the oxidation potential and curre |
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Simulari Monte Carlo pe polimeri in forma de pieptene
CATALIN BERLIC, LIVIA MARIA CONSTANTINESCU |
| There were reported Monte Carlo simulations on comb-like polymeric liquid crystals. It was obtained that the order parameter for the main chain and for the teeth are very close. It was used an adapted form of the Flory theory in order to explain the re |
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Sinteza si caracterizarea sistemului compact condensat heterociclic 2-aminotiazolo<5,4-c> piridina
CRISTIANA RADULESCU, ANA MARIA HOSSU, IONICA IONITA, CORNELIU TARABASANU MIHAILA |
| In this study an original compact condensed heterocyclic system with thiazolic ring, 2-aminothiazolo<5,4-c>pyridine, was synthesized. This has never been quoted in the specific literature and never been purified by classic methods of purification. The liq |
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Sinteza si caracterizarea chimico-analitica a precursorului de tip oxalat pentru obtinerea BaTiO3
ELENA CHIRTOP, LUMINITA VLADESCU |
| In this paper the preparation and characterisation of oxalate precursor for BaTiO3 was studied. The precursor was obtained by coprecipitation of aqueous solutions of titanium tetrachloride and barium chloride, with oxalic acid in molar ratio 1:1:1,2. Ch |
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Studiul comportamentului electrochimic al metalo-porfirinelor
cu Co(II) si Co(III)
Electrod nitrit-selectiv pe baza de clorura de <5,10,15,20-tetrafenil-21H,23H-porfirinat-N21, N22, N23, N24> Co(III)
EUGENIA FAGADAR-COSMA, DANA VLASCICI, GHEORGHE FAG |
| The purpose of this study was the electrochemical characterization by cyclic voltammetry of meso-tetraphenylporphyrinato Co(II) and Co(III) - (CoTPP and ClCoTPP), which were previously synthesised and characterized by UV-vis, FT-IR and 1H-NMR spectrometr |
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Studiul cineticii desulfurarii uscate a gazelor reziduale
cu oxid de calciu
I. Obtinerea datelor experimentale
SIMION DRAGAN, ILIE SIMINICEANU |
| New experimental thermogravimetric measurements, using a CAHN TG-121 system, have been performed on the reaction of sulfur dioxide with calcined limestone.The conversions versus time were measured for particle size of 25 to 900 ”m, over the temperature |
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Studiul statistic al compozitiei compecsilor de Co(II)
cu rosu acid de alizarina G
ELENA STEFANCU, DOINA SIBIESCU, MIHAELA VIZITIU |
| A statistical method is proposed for the determination of composition complexes formed by Co(II) with alizarine red G is proposed.It is calculated the statistical factor texp and by comparison with the Fischer factor tabulated and is established the com |
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Viitorul industriei romanesti de rafinare
ION ONUTU, GHEORGHE CONSTANTINESCU, IOAN RADU ZGAIA, STEFAN STIRIMIN |
| Significant changes in the Romanian petroleum industry are expected to be set in motion during the next five to ten years due to its private competitionally position, national and European community requirements and programs, and as result of the consumpt |
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ANCA-IRINA GALACTION, ELENA FOLESCU, DAN CASCAVAL
Studiul distributiei intensitatii amestecarii in bioreactoare
cu agitare mecanica
1. Lichide de fermentatie simulate |
| The mixing time is one of the most useful criterion for mixing intensity of fermentation broths and for scale-up of biosynthesis processes. This parameter value depends mainly on the rheological properties of the broths, biomass concentration and morpholo |
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CALIN CRISTIAN CORMOS, ANA MARIA CORMOS, SERBAN PAUL AGACHI
Modelarea si simularea procesului de regenerare a amoniacului rezultat din tehnologia de obtinere a sodei calcinate |
| In this paper, the modeling and the simulation for ammonia regeneration process from soda ash production (Solvay technology) have been described. The aqueous solution resulted in the process of sodium bicarbonate synthesis (carbonation process of ammoniac |
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Chemiluminescența in detectia ozonului
I. Procedeu si echipament
SILVIU JIPA, TRAIAN ZAHARESCU, WILHELM KAPPEL, RADU SETNESCU, TANȚA SETNESCU,
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| In this paper, the experimental procedure applicable for the detection of ppm ozone concentration in environment and industrial areas is presented. As emission substrates, some common dyes were adsorbed on a ceramic tablet. Among the used dyes, rhodamine |
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CLAUDIU MAZILU, DOREL RADU, MIHAI EFTIMIE
Relatia dintre viscozitate si ponderea bazicitatii (pB), in sistemul ternar Na2o-B2O3-SiO2 |
| The ternary oxydic system Na2O-B2O3-SiO2 is well known, especially because of its practical interest glasses (Vycor and Pyrex). The paper aims to put into light the basicity percentage (pB) calculating modality taking into account the tetracoordinated bo |
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COSTIN SORIN BALDEA, FLORIS SEBASTIAAN VOS
Starea de multiplicitate In distilarea reactiva cu
o singura etapa
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| The article addresses the steady state behaviour of one-stage reactive distillation process. An exothermic isomerization reaction with first-order kinetics and light-boiling reactant is considered. The dimensionless model distinguishes between the state v |
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ELENA IRINA MOATER, MIHAELA OLTEANU, CRISTIANA RADULESCU, IONICA IONITA
Adsorbtia alchil-poliglucozidelor utilizate ca surfactanti neionici pe bumbac |
| The study of adsorption of non-ionic surfactant on cotton in aqueous solutions and in the presence of dyes is necessary to explain the mechanism of staining and to establish the washing conditions. The non-ionic alkyl polyglucosides were used as surfactan |
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GABRIELA CILINCA, MINODORA LECA
Interactiunea ionilor de plumb si cadmiu
cu unele componente din formulele de detergent in conditii de spalare.
3. Interactiunea cu perborat de sodiu
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| Percentage of available oxygen produced by sodium perborate tetrahydrate in distilled and hard (10 and 16od) water in the presence of 50 mg/L lead or 25 mg/L cadmium ions and their mixture in the absence and the presence of 5 g/L detergent A containing 20 |
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GABRIELA LAURA ALMAJAN, STEFANIA FELICIA BARBUCEANU, IOANA SARAMET,
CONSTANTIN DRAGHICI
Noi compusi heterociclici obtinuti din hidrazidele acizilor benzensulfonilbenzoici-4-substituiti |
| Synthesis of new 1,2,4-triazoles, 1,3,4-oxadiazoles and 1,3,4-thiadiazoles bearing arylsulfonyl-phenyl group is reported using 4-(4-X-benzensulfonyl)-benzoic acid hydrazide 1(a-c), (X=H, Cl, Br). The hydrazide compounds were converted into 5-<4-(4-X-benze |
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GHEORGHE FAGADAR-COSMA, EUGENIA FAGADAR-COSMA, IOAN TARANU
Studiul reactiei de oxidare electrochimica a leucobazei
verdelui malachit |
| The electrochemical oxidation of malachite green leuco base was studied using platinum electrodes, in aqueous H2SO4. The favourable action of a co-solvent (acetone) on the diffusion-controlled limiting current was shown, and was assigned to the influences |
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GHEORGHE JUNCU
Analiza de multiplicitate a unei granule de catalizator in placa finita neizoterma |
| The paper examined the steady-state multiplicity behaviour of the porous, non-isothermal, finite slab catalyst pellet in the absence of external transport resistances. A numerical multigrid continuation technique was used. The present analysis is focused |
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GHEORGHE MARIA
Identificarea procesului si politicile de operare a modelului de baza
pentru un reactor enzimatic de producere a zaharului super rafinat
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| Model-based optimization of fed-batch bioreactors is an intensively studied problem due to the potential economic benefits and increased control possibilities revealed by the (sub)optimal operating policies. However, the bioprocess kinetics high complexit |
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GRATIELA MARIA TARLEA
LEGISLATIA UNIUNII EUROPENE DIN DOMENIUL MEDIULUI |
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GRIGORE BOZGA, ANATOLIE MOTELICA, ROMULUS DIMA,VALENTIN PLESU
Cinetica reacTiei de sinteza a fazei lichide a
tert-amil-etil-eterului catalizata de rasini schimbatoare de ioni
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| The kinetics of the liquid-phase synthesis of tert-amyl ethyl ether by direct etherification with ethanol of the reactive amylenes contained in the FCC light gasoline (C5 fraction) was theoretically and experimentally investigated. The catalyst used was a |
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IN MEMORIAM
RAUL MIHAIL, fondatorul scolii de reactoare chimice din Romania
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ION ILIUTA, MARIA CORNELIA ILIUTA
Modelarea fluxului multifazic al reactoarelor
trifazice cu pat fix
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| Fixed bed columns are intensively used as multiphase contactors and reactors in chemical, biochemical, and petrochemical industries. Because of the two-phase through the fixed beds, the performance of multiphase contactors depends on the complex interacti |
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ION MITELEA, ILARE BORDEASU, ANTON HADAR
Efectul nichelului din otelurile inoxidabile cu 13% crom si sub 0,10% carbon asupra rezistentei la eroziune prin cavitatie |
| The paper presents and analyzed the results obtained by testing to cavitation erosion four stainless steels samples, containing maximum 0.1% carbon, 13% chromium and variable quantities of nickel (between 0 and 6%). The purpose of the experimental work i |
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JACQUES De RUYCK, FRANK DELATTIN, SVEND BRAM, VASILE LAVRIC
Co-utilizarea biomasei si a gazului natural in turbine cu injectare de gaz prin reformarea primara a gazului natural |
| Using biomass in complementary routes for power production is a very modern tendency given that biomass is one of the most important renewable energy sources. This can be done by modifying, in an economical acceptable manner, existing technologies, the ma |
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LAURA-ILEANA SOCEA, IOANA SARAMET, STEFANIA BARBUCEANU, BOGDAN DRAGHICI
Sinteza si caracterizarea unor noi N1-<(arilsulfonil)benzoil>-N4-ariltiosemicarbazide si a produsilor lor de ciclizare |
| Some new thiosemicarbazides (6a-d) bearing arylsulphonylbenzoyl group at N1 and different aryl substituents at N4 were synthesized using classical procedures. Cyclization of (6a-d) in sodium hidroxide medium afforded the corresponding 1,2,4-triazole-3-thi |
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MAGDALENA DIANU, NICOLETA DENEANU, CORNELIU PODINA
Studii asupra procesarii deseurilor lichide organice
de tip solutii de solventi organici si cocktailuri de scintilatori lichizi
generate de Centrala Nuclearo-Electrica de la Cernavoda |
| Organic liquid wastes (organic solvents solutions and liquid scintillation cocktails) were counted in a Model 2100 TR Packard TRI-CARB liquid scintillation analyzer. It was evaluated the performance of three commercially available liquid scintillation co |
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MONICA TOMA, AGUSTIN SANCHEZ, MARIA S. GARCIA-TASENDE, JOSE S. CASAS, JOSE SORDO, EDUARDO E. CASTELLANO, JAVIER ELLENA
Complexele dimetiltaliului (III) cu acidul nicotinic
si hidroxi-derivatele. Structura cristalina si studiul RMN
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| The reaction of dimethylthallium(III) hydroxide with nicotinic acid, (nicH), 2-hydroxy-nicotinic acid (2hnicH2) and 6-hydroxy-nicotinic acid, (6hnicH2) in a 1:1 molar ratio afforded the isolation of , 1, , 2 and |
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OCTAVIAN RADUCAN, ALEXANDRU WOINAROSCHY, VASILE LAVRIC
Controlul optim al unei coloane de distilare discontinue prin algoritmi genetici
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| Finding the optimal control of a highly nonlinear system is not trivial, even when the final time is fixed; when this is free, a supplemental variable to be optimized appears. For batch distillation processes, free-time optimal control means to compute bo |
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PAULA POSTELNICESCU, ANCA MADALINA DUMITRESCU
Influenta modului de compartimentare asupra performantelor reactorului pentru fabricarea polietilenei de joasa densitate |
| The constructive type and the operating mode of polymerization reactors influence directly the reactors performance, illustrated by the monomer conversion and the properties of the macromolecular compounds produced. In this paper are presented the result |
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SILVIU JIPA, TRAIAN ZAHARESCU, RADU SETNESCU, LAURA MONICA GORGHIU,
CRINELA DUMITRESCU
Chemiluminescenta glutenului |
| Radiation treatment of grains provides significant advantages by destroying harmful pathogens and extending self life apparently without detectable physical or chemical changes.The chemiluminescence (CL) accompanying the oxidation of gluten in the tempera |
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TATIANA TUGUI, GHEORGHE DUCA, MARIUS TARANU, GHEORGHE COPACINSHI,
IGOR DRAGUTAN
Evaluarea generarii zacamintelor de gaz |
| This paper presents the results of an assessment focused on identification of landfill gas generation potential at solid waste disposal sites in the Republic of Moldova. The other aim of the assessment is to establish the composition of landfill gases pr |
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Sinteza unor benzimidazo <1,2-a> pirimidine
2,4-di si 2,3,4- trisubstituite si evaluarea citotoxicitatii lor la contactul cu celulele F 2408 si 5RP7
Asiye Meriç, Zerrin Ęncesu, Arzu Karayel, Süheyla Özbey
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| This article describes the synthesis of 2,4-di- and 2,3,4-trisubstituted benzimidazo<1,2-a>pyrimidine derivatives which were tested for their cytotoxicities and their spectral characterizations by IR, 1H- and 13C-NMR, EI-MS. The fused title compounds were |
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, Influența pH-ului asupra constantei de disociere
aparenta pentru Zn2+ - anhidraza carbonica izoenzimă II
Rodica CĂPRIŢĂ, ADRIAN CĂPRIŢĂ, Gheorghe ILIA, IONEL CIUCANU
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| The zinc ion can be removed from the native bovine carbonic anhydrase isoenzyme with the concomitant loss of the catalytic activity. The dissociation of Zn2+ is a reversible process, so that when Zn2+ is added, the enzymatic activity is restored. The meta |
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, Studii spectrale
ale unor azo-complecși ai Ni (II), Pd (II), Cu (II) în matrici polimerice de alcool polivinilic
Ana Emandi, Cristina Vasiliu, Rodica Georgescu, Iulian Ioniţa , Mircea Bulinski
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| A series of four coordinated homologous of d8 Ni(II), Pd(II), d9 Cu(II) ions and 1-phenyl-3-methyl-4-azo-(2-carboxyphenylene)-pyrazol-5-one (LH) as ligand were obtained for the metal to ligand ratio 1/2 with the general formulae .These compounds w |
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Alternative pentru obtinerea 5,10,15,20-Tetrakis(4-hidroxifenil)-21H,23H porfina. Caracterizare fizico-chimica
EUGENIA FAGADAR-COSMA, BIANCA MARANESCU, CORINA ENACHE, CECILIA SAVII, GHEORGHE FAGADAR-COSMA
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| The syntheses of 5,10,15,20-tetrakis(4-hydroxyphenyl)-21H,23H-porphine (THPP) by two different procedures are compared. The first way, known as Adler method, implies reaction between p-hydroxy-benzaldehide and pyrrole in propionic acid medium, using propi |
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Analiza FT-IR, FT-RAMAN si TLC densitometrica a unor extracte din platan din punct de vedere
al compoziției in acid betulinic si betulină
CRISTINA ADRIANA DEHELEAN, CAMELIA PEEV, SIMONA CINTA-PINZARU, CODRUTA SOICA, ADRIANA KAICSA
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| The aim of this study was to analyse triterpenes saponins composition of some plane tree extracts from Platanus acerifolia. The extracts were obtained by using organic solvents and ultrasonication method. Analysis used FT-Raman, FT-IR and TLC densitometry |
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Analiza TLC din punct de vedere calitativ
si semicantitativ a vitaminelor A, D si E.
Ana-Maria HOSSU, Cristiana RĂDULESCU, Mihaela ILIE, Dan BĂLĂLĂU, Vasile Magearu
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| This paper presents a TLC method for determination of vitamins A, D2 and E from mixtures by using 60 F254 TLC plates on plastic sheets and n-hexane / ether (9:1) and benzene / chloroform (1:1).as mobile phases for vitamins A and D2, respectively D2 and |
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Aspecte energetice ale adsorbtiei metalelor grele pe zeolitii naturali.
Influenta pH-ului mediului asupra adsorbției cuprului
LeonaRd Mihaly -Cozmuța, Teodor ViȘan, Anca Mihaly-Cozmuța
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| The article presents the possibility to use the volcanic tuffs in the wastewaters treatment, based on the adsorption of heavy metals cations, particularly copper ions. The used volcanic tuff, coming from Stoiana Pâglișa (Cluj Napoca), is characterized |
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Caracterizarea unor proteine vegetale utilizate ca principii active in produse dermatocosmetice cu efect antiimbătranire
Cristina Borlescu, Maria Giurginca, Ioana Demetrescu
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| The effects of vegetable proteins stimulation of cellular proliferation and regeneration, moisturization and the formation of the film on the skin surface make them valuable ingredients in dermatocosmetics. The paper presents the behavior of some vege |
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Cinetica adsorbtiei ionului de cupru pe diferite biomase
de origine bacteriana si vegetala
Gheorghița Jinescu, Jean-Pierre Magnin, Mihaela Stoica
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| This work represents a study of the copper ion adsorption on different types of biomass. The studied biomasses were the bacteria Thiobacillus Ferrooxidans, Rhodobacter Capsulatus and the plant Eichhornia Crassipes. In the studythe initial concentration o |
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Comparatie intre carbunii de Valea Jiului si lignitul de Gorj
din punct de vedere al caracteristicilor de aprindere
si a cenusii rezultate la arderea lor
Clement Ionescu, Clementina Moldovan, Adelina Ionescu
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| This article presents the characteristics of coal and coal ashes resulted from the burning process. This analysis has two important stages: the first refferes to a chemico-technical characterization of coal samples from six mine facilities located in the |
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Determinarea capacitatii de adsorbtie a anionitului
Dowex-Marathon pentru clorocomplecsii de Ti(IV) si Fe(III)
DAMIAN AXENTE, CRISTINA MARCU, ECATERINA STELA DRAGAN, ECATERINA AVRAM
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| The adsorption capacity of anion exchange resin Dowex-Marathon for Ti(IV) and Fe(III) chlorocomplexes from HCl solution was determined. The measurements were performed for different HCl solution concentrations and temperatures using batch operation as con |
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Extractia asistata cu microunde a uleiului
din germeni de grau
Vasile Dinoiu, Cornelia Nichita, Radu Albulescu
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| Solvent extraction of wheat germ oil by microwaves has been performed in non- polar solvents (extraction essence, n-hexane and n-heptane) in a laboratory type-glass equipment. Three extractions were performed and a mixture of tri-glycerides comprising a l |
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Glazuri cu deseuri de sticla borosilicatica
pentru faianta de menaj
Vasilica Dima, Mihai Eftimie, Stefania Stoleriu, Nicolae Ziman, Maria Gorea
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| The use of boron silicate fiber glass waste for elaborating some glazes could be an efficient solution from the technical and economical point of view, bearing in mind the advantages offerred by the oxidic composition and, above all, by the presence of th |
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Influenta adaosului unor componenti asupra caracteristicilor bitumurilor de oxidare
DORIN BOMBOS, ION BOLOCAN, MIHAELA BOMBOȘ, TRAIAN JUGANARU, NICOLAE NAUM
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| The main method of road bitumen properties improvement consists in their mixing with proper compounds .In the paper are shown the results obtained in the modification of an oxidation bitumen for road applications, D 60/80 type, with a residue from oleic a |
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Influenta dozei de fertilizant asupra calitatii clorofilei plantelor
MONICA BUTNARIU, ADRIAN SMULEAC, CRISTINA DEHELEAN, RAMONA CHIRIȚĂ, VERONICA SĂRĂȚEAN
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| This study represents a comparative analysis of chlorophyll in corn leaves for different fertilization doses. Put in the simplest possible terms, photosynthesis is the process where sunlight is captured by green plants and used as energy that manufactures |
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Mentenanta preselor pretensionate
utilizate la sinteza diamantelor sintetice
Ionel C. Popescu, Georgeta Urse
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| The presses used in diamond synthesis are, in most cases, wire-would frames types. The winding consists of a wire helically wound in pretension in a number of turn and layers around the outside of the press frame. The procedures and the special requireme |
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Noi agenti emulsionati de uscare pentru lacurile din apa
Cristiana Epure, Laurentiu Filipescu
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| Siccative systems based on organic acid salts of cobalt, lead and potassium are highly recommended for many classes of waterborne coatings. Because mineral solvents in which the above salts are soluble hamper the compatibility of these systems with certai |
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Noi compusi din clasa 1,2,4-triazolului cu nucleu
5-H-dibenzocicloheptenic cu actiune antimicrobiana
LAURA-ILEANA SOCEA, IOANA ȘARAMET, BOGDAN SOCEA, BOGDAN DRĂGHICI
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| New five membered heterocycles were synthesized using classical procedures. Treatment of 1,2,4-triazol-3-thioles 2 with alkyl halides gave the corresponding 1,2,4-triazole derivatives 3a,b, 4a,b,c and 5a. All the new compounds were characterized by IR-, U |
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Posibilitati de obtinere a gazului natural sintetic in Romania
Stefan Ragalie Frumuzache Barca
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| This paper justifies the necessity of producing the synthetic natural gas in Romania. Available raw materials are analyzed, and it results that Valea Jiului area, with a reorganized technology and management, could ensure the necessity of coals for this i |
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Simularea numerica a exploziilor amestecurilor de
gaze naturale - aer in spatii inchise
SORIN NEACSU, CORNEL TRIFAN, MIHAI ALBULESCU
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| The paper proposes a bi-dimensional numerical pattern that allows the simulation of explosions in closed estates with different geometries. The present paper takes into consideration an estate in which an explosion has been produced. The effect of staine |
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Studii privind solubilitatea hidrogenului in titan
Mihai Buzatu, Valeriu Gabriel GHICA
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| The increased solubility of H2 in Ti and Ti alloys was noticed even at the beginning of their production. Today, the demages are avoided, due to decreased H2 content of manufactured Ti objects. The paper presents the results regarding the investigation of |
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Studiul mineralizarii cristalului
violet in apa prin metoda electro-Fenton
ILIE SIMINICEANU, CARMEN IONELA ALEXANDRU, ERIC BRILLAS
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| The mineralization of acidic aqueous solutions with 0.166 to 1.333 mM Crystal Violet (CV) in 50 mM Na2SO4 as background electrolyte has been studied by the electro- Fenton method, where the oxidizing hydroxyl radicals were produced from the Fenton reactio |
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Studiul proprietătiilor de inhibare a proceselor oxidative din
uleiurile vegetale folosind antioxidanti din familia Rhamnaceae
Mariana Pop, Mirel Glevitzky, Svetlana Cacig, Alfa Xenia Lupea
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| To follow the relative rate of oxidative deterioration of edible oil: sunflower and olive oil, the samples were analyzed periodically for their peroxide value following exposure to ambient room light, dark places and thermal treatment behavior. Also the p |
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Studiul reactiei de obtinere a N,N-diftalimidilcarbonatului pornind de la trifosgen și N-hidroxiftalimida in prezenta trietilaminei
Monika Simon, Andreea Micle, Ileana Armeanu, Mihai Medeleanu, Carol Csunderlik
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| In order to obtain N,N-diphthalimidyl carbonate, the reaction of bis(trichloromethyl)carbonate (triphosgene) with N-hydroxyphthalimide, in the presence of triethylamine, has been studied. The reaction took place using methylene chloride or tetrahydrofu |
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Studiul tautomeriei tiol-tiona a
5-<4-(4X-fenilsulfonil)fenil>-1,3,4-oxadiazol-2-tiolilor
GABRIELA LAURA ALMAJAN, STEFANIA FELICIA BĂRBUCEANU, CONSTANTIN DRĂGHICI
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| 5-<4-(4X-Phenylsulfonyl)phenyl>-1,3,4-oxadiazole-2-thiones 1(a-c) reacted with haloalkanes to give S-alkylated compounds 2(a-c). Aminomethylation and acylation of the thiones yielded N(3)-derivatives 3(a-c) and 5. Theoretical computational studies sup |
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| Aspecte privind corelatia dintre comportarea reologica si structura unor amestecuri nenewtoniene |
| The binder for siderurgical electrodes and raw materials for petroleum coke contain saturated hydrocarbons, aromatics, resins and asphaltenes. The presence of agglomerated structures in the fluid materials causes the non-Newtonian behaviour in the flow wh |
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| Caracterizarea unor chinone si a derivatilor acestora prin spectroelectrochimie si chemiluminescenta in mediu aprotic |
| Benzoquinone, naphtoquinone, antraquinone and some of their derivatives were characterised by spectroelectrochemical and chemiluminescence techniques, while the purity was checked by means of X-ray diffraction. A correlation was established among the pro |
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| Comportamentul cromatografic si lipofilicitatea complecsilor Pd(II) si Pt(II) ai Pi-2-carbaldehida tiosemicarbazonei cu opotentiala activitate biologica |
| The chromatographic behaviour and relative lipophilicity of Pd(II) and Pt(II) complexes of pyridine-2-carbaldehyde tiosemicarbazone with potential biological activity have been determined by reversed-phase thin-layer chromatography using amino, diol and C |
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| Comportamentul surfactantului neionic SA12EO in camp electric |
| This paper is dedicated to the memory of Professor Maria Honciuc as nothing could have been possible without her total devotement and essential contribution to the work of LC laboratory of physical department. The influence of the external electric field |
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| Durata formarii bulelor de gaz emise de difuzori porosi |
| Using Bernoullis relation for the real gas, which penetrates through a porous diffuser and also using the equation for the conservation of the flow rate for a spherical gas bubble, with the R radius and velocity, it will be obtained the theoretical time |
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Echilibrul lichid vapori XI. Curba de fierbere pentru sistemul ternar acetat
de vinil benzen - anhidrida maleica
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| This paper describes the experimental obtaining of boiling curves at normal pressure for the homogenous ternary mixtures: vinyl acetate benzene maleic anhydride. An equation describing boiling curves for ternary mixtures using binary data was prese |
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| Identificarea si masurarea cantitativa prin spectroscopie 1H-RMN a catorva compusi prezenti in vinurile romanesti |
| Wine composition presents a large variety, generated mainly by the type of grapes used, geographical origin and climate. In this paper it was established markers in the high-resolution 1H-NMR spectrum of some Romanian wines. Those markers can be used for |
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| Inglobarea unor cenusi poluante in sticle stabile chimic |
| Loose ashes with toxic components has been included in glasses chemically established, realizing in this may the necessary premises for their storage in conditions which can not endanger the environment quality. In this paper there was peesented the obta |
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| Obtinerea si caracterizarea dispersiilor nanocristaline de NaCl pentru medii terapeutice de tip salin. 1. Aspecte teoretice |
| The paper presents the obtaining process and microstructural characterization of the NaCl aerosols, containing references from scientific literature about present methods and techniques for synthesis , and also the main characteristics of aerosol parti |
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| Proprietatile PVT ale fluidelor pure determinate din ecuatiile de stare bazate pe termodinamica statistica |
| In this work, three equations of state (Dohrn-Prausnitz <1>, Deiters <2>, BACK <3>), based on statistical thermodynamics, were used to calculate PVT properties for four substances (argon, carbon dioxide, methane and propane) on a large range of temperatur |
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| Reactia Arbuzov folosita in sinteza fosfonatilor pe baza de rasini |
The phosphonates grafted on styrene-divinylbenzene copolymers were obtained. A simple procedure for the calculation of the functionalization degree and the statistical modelling of the structural repetitive unit of the copolymer are reported.
Keyword |
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| Rezistenta anticorosiva a aliajelor industriale de titan, prelucrate termic, in solutii alcaline, la temperaturi ridicate |
| This study comprises the influence of the corrosive alkaline environment on the passive layer properties on titanium and its alloy Ti-1Ni-0.5Mo. The influence of the thermal treatment by forging is examined. The corrosion resistance of ternary alloy in co |
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| Sinteza si caracterizarea unor mono-baze Mannich-Werner ale 4-cromanonelor, potentiali regulatori de crestere a plantelor |
| In this paper it is reported a facile one - pot synthesis of some Mannich - Werner mono - bases of 4-chromanones, using as starting materials alkyl orto-hydroxyphenyl ketones 3 and 6. The preliminary biological activity tests of the synthesized |
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| Structura, culoarea si fluorescenta unor coloranti 11-TIA-4b,5,10,12 - tetraaza-benzo<5,6>pentaleno<1,2-b>naftalenici |
| The article presents experimental data regarding structure and fluorescence of some 11-thia-4b,5,10,12-tetraaza-benzo<5,6>pentaleno<1,2-b>naphthalene dyes. Structure-colour-property relations in the pigments are discussed with respect to the nature of the |
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| Studiu cinetic asupra diferentelor structurale ale activitatii de stabilizare a antioxidantilor fenolici |
| A kinetic approach concerning the effects determined by stabilizer structure on the progress in the degradation of LDPE is reported. Various phenol antioxidants whose oxidation prevention activities were assessed reveal the influence of different substit |
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| Studiul teoretic si experimental al mobilitatilor cromatografice ale unei serii de arilamide ale acizilor orto-hidroxiarilcarboxilici prin RP-TLC si metode de calcul estimativ |
| Chromatographic RM mobilities of 25 arylamides of some o-hydroxy-arylcarboxylic acid of Naphthol AS type have been determined by reversed phase thin layer chromatography (RP-TLC). Structural descriptors of the arylamides were derived by molecular mechanic |
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Analiza dispersa a tufului vulcanic analcitic
si caracterizarea fractiunilor
II. Caracterizarea fractiunilor
ADRIANA VUZA, LUCIA ODOCHIAN, MIHAI DUMITRAS, GHEORGHE NEMTOI, MIHAI LIVIU CRAUS, FLORINA CRIVOI, FLOAREA MANEA |
| This paper consists in the characterization, by density, X-ray diffraction, IR spectra, non-isothermal thermogravimetric analysis (TG, DTG) and electrochemical methods (electroconductibility on the solid fractions and on aqueous solutions), of the Nereju- |
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Caracterizarea structurala a unor coloranti derivati ai esterului monosulfuric al 2-(4-amino-benzensulfonil)-etanolului
MONICA ELENA LUNGU, VALENTIN RADITOIU, LUMINITA WAGNER, ALINA RADITOIU, CONSTANTIN ALIFANTI, CORNELIU TARABASANU-MIHAILA, ALFA XENIA |
The paper describes the characterization of fourteen new reactive dyes with vinylsulphone groups. These dyes were purified and characterized in terms of their elemental analysis, IR, 1H and 13C-NMR spectra.
Keywords: sulfuric acid mono-<2-(4-aminobenz |
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Caracterizarea unor carbuni activi obtinuti din materii prime neconventionale
TUDOR LUPASCU, RAISA NASTAS, ZUBAIDA ABDULFATAH, MARIA GIURGINCA,
AURELIA MEGHEA
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| Several types of active and oxygenated coals obtained in micropilot plant by IR and UV VIS NIR spectral techniques, as well as by chemiluminescence, are characterized. The tests revealed the main changes induced during oxidation of a number of coals o |
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Comportarea electrochimica a unor biomateriale pe baza de titan in fluide fiziologice
MIHAI VASILE POPA, ECATERINA VASILESCU, PAULA DROB,IOANA DEMETRESCU, CORA VASILESCU, DANIELA IONIȚĂ, MIHAI FLORIN POPA
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| The electrochemical behaviour of titanium and its dental implant alloy Ti-6Al-5V in artificial Carter-Brugirard saliva and Ringers solution of different pH values which simulate the extreme functional |