Materials Literature
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Abstract Anhand der Ergebnisse von Modellversuchen mit Bodenproben aus verschiedenen Ober‐ und Unterbodenhorizonten unterschiedlichen Stoffbestandes werden die für die Löslichkeit und Bindung der Schwermetalle Cu, Zn, Cd und Pb unter oxidierenden Bedingungen wichtigsten Einflußgrößen ermittelt. Das Löslichkeitsverhalt…
Carbon films were deposited using mass-separated C+ ions of 300 and 600 eV. The films have diamond-like characteristics such as transparency in the visible spectral region with wavelengths longer than about 650 nm and in the infrared, and high electrical resistivity. Transmission electron diffraction analysis shows th…
An alignment method for smectic liquid crystals is described. Alignment is obtained by the deposition of a certain class of polymer on a substrate followed by unidirectional rubbing. Only linear polymers capable of being elongated in bulk samples are found to produce alignment. The quality of alignment is found to be…
The electrochemical polymerization of pyrrole on a platinum electrode covered with a film of poly(vinyl chloride) produces a dark brown, ductile, and flexible composite polymer film with an electrical conductivity comparable to polypyrrole, and mechanical properties very simllar to poly(vinyl chloride).
Abstract The modification of an amorphous random ethylene‐propylene rubbery copolymer (EPM) has been accomplished by solution grafting of maleic anhydride molecules promoted by radical initiators, The resulting EPM‐g‐succinic anhydride (EPM‐g‐SA) and EPM have been used to obtain binary polyamide 6/EPM or polyamide 6/E…
Electron microscopic examination of epiphyseal cartilage tissue processed by high pressure freezing, freeze substitution, and low temperature embedding revealed a substantial improvement in the preservation quality of intracellular organelles by comparison with the results obtained under conventional chemical fixation…
The stability of the SDW phases in (TMTSF)2ClO4 can be interpreted by simple arguments of anisotropic Fermi surfaces nesting : first, we show that anion ordering, by introducing new Bragg's reflexions, perturbs the nesting and lowers the SDW stability. Then, we improve Gor'kov and Lebed's argument on the effect of a m…
For a simple anisotropic metal model with two open nested Fermi surfaces, it is shown that the tendency to spin density wave formation increases when a magnetic field is applied, which could lead to a series of phase transitions as functions of the field value. The results are suggested as an explanation of the phase…
Etude theorique du procede d'oxydation radiolytique du graphite dans des reacteurs refroidis par l'anhydride carbonique. Etude experimentale de l'influence de cette oxydation sur differentes proprietes physiques et mecaniques du graphite. Influence de cette oxydation sur la duree de vie des briques de graphite utilise…
The solvent effect on the quantum yield of the self-sensitized photoperoxidation of 1,3-diphenylisobenzofuran has been investigated. The influence of the singlet-oxygen lifetime as well as the viscosity of the solvent are quantitatively described.
Thermal decomposition behavior of titanium hydride (TiH2) powder at temperatures between 250 and 330 °C (523 and 603 K) has been studied from both thermodynamic and kinetic viewpoints. Equilibrium hydrogen pressure measured in a closed system was found to vary from the order of 10−3 to 10−2 Torr (10−1 to 1 Pa) and the…
Abstract Rate studies are reported of the effect of rehydration‐dehydration cycling on the vapor hydration behavior of solid K 2 CO 3 . Isothermal rate data were obtained at different temperatures and water vapor pressures for the reaction of narrowlysized anhydrous particles. Effects of different particle preparation…
Abstract Ten soil profiles from the agricultural areas in Saudi Arabia were investigated for their mineralogical properties and some general characteristics. It was found that the soils of the eastern region were Torrifluvents and Gypsiorthids, coarse in texture with high salt, gypsum and carbonate contents. Soils of…
The tooth plates in the living Holocephalan, Chimaera phantasma were studied by various techniques. They consisted of osteodentin and hypermineralized pleromin (kosmin). The degree of mineralization on the latter was as much as in the enameloid of Chondrichthyes and Osteichthyes. Scanning electron microscope observati…
A tabulation of some 40 measured values of the polarization ratio K (a measure of the fractional polarization introduced into an X-ray beam by a crystal monochromator) is presented. The values may be represented through the parameter n given by K = cosn2θM. The measured values of n cluster around unity and the theoret…
Precise measurements of hydrogen permeation through highly purified iron have been performed utilizing the gaseous permeation technique with the hydrogen pressure ranging between 0.001 and 0.1 MPa in a wide temperature range from 420 to 1100 K. The effect of surface oxide and/or lattice imperfections on hydrogen trans…
The kinetics of the electrochemical evolution of 18O16O from NiCo2O4 and LixCo3–xO4(0 < x < 1.5) electrodes enriched with 18O have been studied. The number of sites responsible for oxygen evolution is related to the lithium content of LixCo3–xO4, showing the importance of tetrahedrally coordinated Co3+. NiCo2O4 has di…
The glass system consisting of ZrF4, BaF2, LaF3, NaF, and AlF3has been developed for optical fibers operating in the mid-infrared region. The glasses in the system possess less tendency to crystallize and favorable optical properties. Additives to improve light scattering characteristics of the fluoride glasses are re…
Zn2+ ions octahedrally co-ordinated in a non-stoicheiometric Zn–Cr spinel-like phase are the active sites in the catalytic synthesis of methanol from syngas at high temperature.
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