Materials Literature
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The purpose of this work is to present thermoelectric and mechanical properties of Bi-Te polycrystalline materials. Semiconducting ceramics of p- and n-type bismuth telluride were prepared by a hot press method. High purity row materials of Bi, Sb, Te and Se were used for the alloy preparation and the sample with a di…
Some Unusual Reactions of Disodium 2-Oxo-1,3-dithiole-4,5-dithiolates with Biselectrophiles Reaction of disodium 2-oxo-1,3-dithiole-4,5-dithiolate (3) with dichloro-maleic anhydride (4), Mucobromic acid (7) and its pseudoester 9 leads to the formation of the 1,3-dithiolo[4,5-b]-1,4-dithiins 6, 8 and 10. 3 condenses wi…
The influence of the 1-adamantyl group on the structure and the proton transfer dynamics of N-unsubstituted pyrazoles has been determined. Four compounds have been labelled with 15 N and studied by variable temperature 15 N CP MAS NMR spectroscopy: 3(5)-(1-adamantyl)pyrazole 2, 4-(1-adamantyl)pyrazole 3, 3,5-dimethyl-…
The transconductance of an electrochemical transistor-like sensor device derived from coating and connecting three closelyspaced microelectrodes with polyaniline film has been shown to be effectively controlled by an electrocatalytic reaction (e.g. SO2 oxidation in acid media) occurring at the surface of the electropo…
A lateral test structure with metalized film electrodes is shown to have distinct advantages over a conventional solid electrode structure for studying the HV characteristics of solid insulators in vacuum. The paper presents results of streak photography and spectral analysis of surface discharge luminosity, and of pr…
On présente une théorie des phases condensées formées d'objets uniaxes basée sur l'hypothèse que le désordre orientationnel est, à toute température, un phénomène essentiellement collectif, associé à des modes visco-élastiques thermiquement excités. Sous cet aspect, cette théorie peut être considérée comme une général…
The optical properties of amorphous Ga20Se80−xBix (a-Ga20Se80−xBix) thin films (where x = 0, 5, 10, 15 and 20) have been studied in the wavelength range (450-1400 nm). It is found that the optical bandgap decreases with increasing bismuth content in the a-Ga20Se80−xBix system. The value of the refractive index n decre…
These proceedings publish about eighty papers presented at the symposium. They are spread over four main subjects: binder properties, mixture properties, mix design and field topics. In addition the first chapter is devoted to the analyses of the RILEM TC (Technical Committee) inter-laboratory tests. Recommendations a…
Emulsions can improve the emollient property of lipsticks because of the introduction of hydrophilic ingredients. A lipophilic emulsifier (Span 60 or Span 80) or a hydrophilic emulsifier (Tween 20) was used to prepare emulsion lipsticks. The experimental results show that a hydrophilic emulsifier is as good as a lipop…
The fracture toughness and fatigue crack growth properties of carbon steel (S35C) were investigated in 1.1MPa argon gas and in high pressure hydrogen gas up to 9.9MPa at room temperature. The effect of hydrogen on the crack growth was discussed. The results obtained are as follows;(1) JIH value in hydrogen was smaller…
In this work, a model has been developed and characterized to account for the mechanical behavior of silicon dioxide and its effect on oxidation kinetics. Conservation of mass, momentum balance, and the transport equation along with appropriate boundary conditions have been formulated. The material law used for the ox…
Soil colour is an easily identifiable property that is invariably used as a parameter in all soil classification systems including the system used in South Africa. To test the hypothesis that soil colour is a reflection of the soil water regime, the physical, chemical, morphological and hydrological properties were me…
Three-dimensional structures of laterally aggregated bundles of collagen molecules, segment-long-spacing (SLS) crystallites, were imaged by atomic force microscopy (AFM) in atmosphere. The overall image of the type I collagen SLS in a height-amplified mode was semi-cylindrical, approximately 300 nm in length, with two…
N-Phenylmaleimide–styrene copolymers (PMS) and reactive N-phenylmaleimide–styrene–p-hydroxystyrene (HSt) terpolymers (PMSH) containing p-hydroxyphenyl groups were used to improve the toughness of bisphenol A diglycidyl ether epoxy resin cured with methyl hexahydrophthalic anhydride. PMS and PMSH were effective modifie…
In order to elucidate the nature and the structure of the elusive (OC)2Rh(Ph3SiO)2Rh(cod) (cod) = cycloocta-1,5-diene) complex, an important model compound for surface catalysis, (OC)2RhCl2Rh(cod) has been synthesized, and structurally characterized by ab initio X-ray powder diffraction. Crystals of (OC)2RhCl2Rh(cod)…
Twenty cardenolide glycosides were obtained from the leaves, wood and twigs of Thevetia ahouai (LINN.) A.DC., Apocynaceae. Among these, four compounds were determined to be new combinations of known aglycones and sugars, based on spectral and chemical evidence, and nine compounds were C-nor-D-homo cardenolide glycosid…
The chemical reaction mechanism and fine particle generation during atmospheric pressure chemical vapor deposition with the tetraethylorthosilicate/ozone system were studied experimentally and theoretically for a flow-type vertical-tube reactor. For the thermal decomposition of ozone, numerical simulations obtained us…
Ca. 2 and >5 molecules of hydrated water are removed from the inner sphere of Eu III on strongly and weakly acidic ion-exchange resins, respectively, showing the different mechanisms between ion-exchange reactions occurring on these two types of resins.
Summary This paper describes an investigation of the effects of tungsten on the precipitation behaviour of intermetallic compounds in the HAZ of duplex stainless steel and the mechanism of these effects to clarify the advantage of having some Mo replaced by W. Fine precipitates of sigma phase are observed in electron…
A method of radioactive waste concentration by membrane distillation is presented. Water flow through a hydrophobic membrane results from the temperature gradient between membrane surfaces which are in contact with two waste streams, warm and cold. A transport of water from the warm to the cold stream occurs and radio…