Materials Literature
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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.
Summarv
Drop calorimetry measurements for four Na 2 0‐Si0 2 liquids indicate that, to within ±0.5%, the heat capacities are temperature‐independent between 900 and 1800 K and additive functions of composition for liquids containing from 50 to 100 mol% Si0 2 . In this composition interval, the partial molar heat capacities of…
Electron micrographs of a silver resistant strain of Pseudomonas aeruginosa grown in the presence of 50 micrograms/ml Ag+ indicate that the surviving cells are resistant at the level of the cytoplasmic membrane. Spheroplasts of the resistant strain were not lysed by 1 h contact with 8 micrograms/ml Ag+, but were 36% a…
The strain rate sensitivity in a variety of metals is known to increase dramatically when the strain rate exceeds about 10/sup 3/ s/sup -1/. In copper, this behavior is analyzed in terms of the transition in rate controlling deformation mechanism from thermal activation to dislocation drag. The mobile dislocation dens…
Etude aux microscopes electroniques. Especes nouvelles pour l'Ocean Pacifique Sud, l'Ocean Indien ou l'hemisphere Nord. 16 especes sont des membres importants du nanoplancton
Wood materials have been successfully reinforced in the laboratory but rarely reach commercial markets. Even though this situation may continue for some time, reinforced wood materials should continue to be considered. The changing forest resource guarantees the change in economics of these materials in the future. In…
The solubilities of acetaminophen (N-(4-hydroxyphenyl) acetamide) (ACA) were determined in various aqueous cosolvent mixtures, i.e., ethanol-water, polyethylene glycol 400 (PEG 400)-water and polyethylene glycol 4000 (PEG 4000)-water, by ultraviolet spectrophotometry at 244nm, a 30±2°C. The mixed solvents were prepare…
[Au9{P(C6H4OMe-p)3}8](NO3)3crystallizes from CH2Cl2–toluene in two crystalline modifications one tetragonal and the other orthorhombic; single crystal X-ray crystallographic determinations on the two modifications have demonstrated that the tetragonal modification has a skeletal geometry derived from an icosahedron an…
The Hippo pathway was initially discovered in Drosophila melanogaster as a key regulator of tissue growth. It is an evolutionarily conserved signaling cascade regulating numerous biological processes, including cell growth and fate decision, organ size ...Read More