Претраживање
Приказ резултата 61-70 од 238
Boron removal by anion exchangers impregnated with citric and tartaric acids
(Taylor & Francis Inc, Philadelphia, 1996)
The separation of boron compounds, boric acid and borax, with anion-exchange resins, before and after impregnation with citric and tartaric acids, has been studied. Three different commercially available anion exchangers ...
Effect of substituents on the C-13 NMR chemical shifts of para-substituted alpha-phenyl-beta-pyridylacrylic acids
(Elsevier, Amsterdam, 1997)
The C-13 NMR spectra of para-substituted alpha-phenylcinnamic and 3- and 4-pyridylacrylic acids, with a wide range of substituents effects, were determined in deuterated dimethylsulfoxide (DMSO-d(6)). The effect of ...
A rheological study of behavior of polymer-bitumen blends
(Erdoel Erdgas Kohle/EKEP, 1996)
The influence of the elastomer such as SBS and SBR and their mixtures on the structure and rheological properties of blown bitumen B 65 blends, was studied. The crude oil denoted as SEB (Soviet Export Blend) was used to ...
Comparison of critical ΔT-values with R-parameters of thermally shocked alumina refractories
(Expert Fachmedien GmbH, 1997)
The thermal shock stability of ceramic materials can be characterized using critical temperature difference or resistance parameters. Resistance parameters R and Rst are used in this paper. Two ways of representing thermal ...
Quantum approach to GaAs MESFETs
(IEEE, 1997)
This paper is completely devoted to an original method of determination of carriers distribution in GaAs MESFET channel based on the investigation of transport equation including a quantum correction term.
Synthesis and rheological study of some maleic acid and fumaric acid stereoregular polyesters, 10 - Synthesis and characterization of alpha,omega-dihydroxyoligo(alkylene maleate)s
(Wiley-VCH Verlag Gmbh, Weinheim, 1998)
alpha,omega-Dihydroxyoligo(alkylene maleate)s with molecular weights ranging from 1500 to 4000 were prepared by polycondensation, in 1-methyl-2-pyrrolidone at 105 degrees C, of potassium maleate and 1,4-dibromobutane, ...
The potential of piezoelectric sensors for characterization of activated carbon cloth applied in adsorption of phenols from air
(Amer Chemical Soc, Washington, 1998)
Characterisation of activated carbon cloth (ACC) applied for phenols adsorption from the air was performed by a pair of coated piezoelectric quartz crystals as sensors. ACC cloth was impregnated with specific organic ...
Sulphatization of manganese slime from zinc electrolysis with ferrosulphate
(Wiley, Hoboken, 1998)
The kinetics and mechanism of the sulphatization of manganese slime from the zinc electrolysis with Fe(ll) sulphate was studied. The priority of chemical reactions was determined on the basis of the results of thermodynamic ...
Microstructural characteristics of calcium hydroxyapatite/poly-L-lactide based composites
(Wiley, Hoboken, 1999)
Besides its high osteoinductive properties, hydroxyapatite (HAp) exhibits a relatively low mechanical strength. In order to improve the mechanical properties and reliability of HAp based composites, the addition of selected ...
Temperature-dependent hydrogen electrochemistry on platinum low-index single-crystal surfaces in acid solutions
(Amer Chemical Soc, Washington, 1997)
The hydrogen evolution (HER) and the hydrogen oxidation reaction (HOR) were studied on platinum single crystals in a sulfuric acid solution over the temperature range 274-333 K. We found, for the first rime, that at a fixed ...