Претраживање
Приказ резултата 41-50 од 428
Optimization of the production of biodiesel by a commercial immobilized lipase in a solvent-free system using a response surface methodology / Optimizovanje postupka proizvodnje biodizela komercijalnom lipazom u sistemu bez organskog rastvarača primenom metodologije odzivnih površina
(Serbian Chemical Society, Belgrade, 2008)
Response surface methodology was used for the evaluation of the effects of various factors on the synthesis of biodiesel catalyzed with immobilized lipase from Rhizomucor miehei in a solvent-free system. The production of ...
The thermal stability of poly(methyl methacrylate) prepared by RAFT polymerisation / Termička stabilnost poli(metil metakrilata) sintetisanog RAFT polimerizacijom
(Serbian Chemical Society, Belgrade, 2008)
Poly(methyl methacrylate), PMMA, was prepared by reversible addition-fragmentation chain transfer, RAFT, polymerisation using 2-(2-cyanopropyl)-dithiobenzoate, CPDB, as the RAFT agent. The thermal stability of the resulting ...
Effects of solvent and structure on the reactivity of 6-substituted nicotinic acids with diazodiphenylmethane in aprotic solvents / Uticaj rastvarača i strukture na reaktivnost 6-supstituisanih nikotinskih kiselina sa diazodifenilmetanom u aprotičnim rastvaračima
(Serbian Chemical Society, Belgrade, 2009)
The rate constants for the reactions of diazodiphenylmethane (DDM) with 6-substituted nicotinic acids in aprotic solvents at 30°C were determined. The obtained second order rate constants in aprotic solvents, together with ...
The structure of bright zinc coatings / Struktura sjajnih prevlaka cinka
(Serbian Chemical Society, 2000)
The structures of bright zinc coatings obtained from acid sulfate solutions in the presenceof dextrin/salicylaldehyde mixture were examined. It was shown by the STM technique that the surfaces of bright zinc coatings are ...
Nondispersive solvent extraction-stripping of phenol in a hollow fiber-in-fiber membrane contactor
(Serbian Chemical Society, Belgrade, 1996)
Phenol extraction from aqueous solution and its simultaneous concentration into caustic stripping solution using a hollow fiber-in-fiber type membrane contactor was investigated. The phenol separation rate using sunflower ...
Apparent energy of activation for hot working of vanadium microalloyed steel
(Serbian Chemical Society, Belgrade, 1996)
Two-stage linear In [sinh(ασca)] vs.1/T plots, based on isothermal continuous and anisothermal multipass torsion curves, indicate the double Q HW behaviour of a V-steel. Above T nr , Q HW is independent of all variables ...
Ion exchange of synthetic zeolite A with Cr(III) ions
(Serbian Chemical Society, Belgrade, 1997)
A series of chromium-exchanged zeolite A was prepared by ion-exchange using very dilute solution of a chromium(III) salt. The chromium(III) ions can replace up to 40% sodium cations. A significant lattice decomposition was ...
The kinetics of lead leaching from lead(II) sulphate in aqueous magnesium chloride solutions
(Serbian Chemical Society, Belgrade, 1997)
The kinetics of lead leaching from lead(II) sulphate in aqueous magnesium chloride solutions was studied. The lead leaching rates were measured using an agitated vessel at atmospheric pressure. The effects of the MgCl2 ...
Densification and crystallization behaviour of colloidal cordierite-type gels / Denzifikacija i kristalizacija koloidnih gelova kordijeritnog sastava
(Serbian Chemical Society, Belgrade, 2001)
Three cordierite-type gels were prepared from an aqueous solution of Mg(NO3)2, a boehmite sol and silica sols of very small particle sizes. The effect of varying the silica particle size on the crystallization and densification ...
Solvent effects on electronic absorption spectra of 3-N-(4-substituted-phenyl)-5-carboxy uracils
(Serbian Chemical Society, Belgrade, 1999)
Absorption spectra of some 3-N-(4-substituted phenyl)-5-carboxy uracils (substiuents: H, Cl, Br, I, Me, Et, OMe, COOH and NO2) were recorded in twelve solvents in the range 200-400 nm. The effects of solvent polarity and ...