Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The Raman spectra of the C=O stretching mode of formamide, N-methylformamide and N,N-dimethylformamide mixed with various solvents were systematically studied as a function of concentration. It was found that the hydrogen bond effect plays an important role in reducing the carbonyl stretching wavenumbers for both isot…
This study investigated the chemical stability of pure gallium in water and saline solutions in order to obtain fundamental knowledge about the corrosion mechanism of gallium-based alloys. A pure gallium plate (99.999%) was suspended in 50 mL of deionized water, 0.01%, 0.1% or 1% NaCl solution at 24 +/- 2 degrees C fo…
Hardness of a molecule has been formulated as an average of a set of terms representing various types of reactivity. Hardness parameters for molecules and bonded atoms have been calculated by the ab initio Hartree-Fock self-consistent field (HF SCF) method. An analysis has been presented of the correlation between the…
It is of great importance to find ways to protect concrete from corrosion, to maintain the concrete structure for a long time. A sulfur-oxidizing bacterium, Thiobacillus thiooxidans, has been known to play a crucial role in concrete corrosion and the concrete supplemented with nickel was resistant to corrosion. To obt…
Abstract
Styrene oxide isomerase (SOI) [EC 5.3.99.7], most probably located in the cell wall, was partially purified from Coiynebacterium sp. AC-5 cells grown in a styrene gas atmospheres. The enzyme catalyzed the isomerization reaction to give phenylacetaldehyde, but did not catalyze its reverse reaction. The optimum pH of th…
Eleven high-alloyed stainless steels (SS) were tested for application in chlorinated seawater. Critical crevice temperatures (CCT) were determined using a potentiostatic test method. Results were evaluated in terms of the critical crevice index (CCI) value of the alloys and compared to results of duplicate specimens i…
Copper self-diffusion has been studied in CuO, Y2Cu2O5 and YBa2Cu3O7–xceramics by the SNMS (secondary neutral mass spectrometry) technique in the temperature range 700–900 °C with the stable isotope63Cu used as a tracer. The lowest diffusion rate and the highest value of activation energy were found for the Y2Cu2O5 ph…
The molecular hyperpolarizabilities, β, of spirolinked push−pull polyenes, where the several 1,4-cyclohexadiene rings linked through the tetrahedral sp 3 carbon atoms and electron-donating and -withdrawing groups were introduced in the terminal 1,4-cyclohexadiene rings, were investigated through the ab initio and INDO…
The kinetics of the absorption of lubricating oils and moisture from air into porous polyimide, as well as the exchange of oil between porous polyimide retainers and oil baths or operating bearings, have been measured. Oil absorption into porous polyimide is much faster than into cotton-phenotic. Water is absorbed by…
Epitaxial and textured ceria films were prepared by conventional electron-beam evaporation on (001) LaAlO3, (11̄02) R-cut sapphire, (001) Au, and (001) Pd substrates using ceramic and metallic sources. Deposition temperature and deposition rate were varied to determine their effects on the formation of the CeO2 films.…
An intermediate in the ethanolysis reactions of MoCl 5 , [MoOCl 3 (EtOH)] 2, has been isolated after the reaction of MoCl 5 with 2 equivalents of EtOH and its crystal structure was determined. Treatment of MoCl 5 with 2.5 equivalents of EtOH and subsequent cooling as well as the reaction of [Cl 2 OMo(µ-OEt) 2 (µ-HOEt)…
Reactions of copper(I) acetate with bis(trimethylsilyl)selenium in the presence of phosphine ligands produce a wide variety of cluster compounds. The formation of these compounds depends very much upon the phosphine used, the solvent and reaction conditions. The following products have been isolated and characterised…
In high-resolution x-ray diffraction sometimes a pronounced splitting of the strongest Bragg reflections in decagonal ${\mathrm{Al}}_{70}$ ${\mathrm{Co}}_{15}$ ${\mathrm{Ni}}_{15}$ is observed. So far, this has been interpreted as evidence for a twinned (micro-)crystalline state with large lattice parameters. In the p…
International audience
Following a review of the processing of functionally graded metals and metal-ceramic composites in Part 1; this Part 2 of the two part series focuses on the thermomechanical behaviour. The paper begins with an overview of the fundamentals of thermoelastic and thermoplastic deformation in metal-ceramic composites. Vari…
Two-dimensional-braid geometry is analyzed. The cover factor of a fabric braided on a particular braider depends on three variables: braid angle, helical length, and braid diameter; however, only two of the three are independent because of an equation of constraint. The cover factor of an existing braid is a function…
High density polyethylene blow modling resins have been identified as a primary material for solid waste minimization and recycling. An experimental study into the effect of multiple extrusion cycles on the properties of a virgin homopolymer, virgin copolymer, natural post consumer, and mixed color post consumer blow…
Treatment of (octaethyl-2,3-dihydroxychlorinato)nickel(II) with lead tetraacetate in benzene causes cleavage of the 2–3 bond to give the nickel(II) 2,3-secochlorin-2,3-dione system 7, a previously unknown structural type. The structure is established by elemental analysis and spectroscopic methods, and confirmed by X-…
Microhardness measurements have been performed on porous silicon (PSi) films. The dependence of the hardness on porosity, morphology and the underlying silicon substrate has been established. A model which determines the intrinsic film hardness has been developed and experimentally validated. The load dependence of ha…