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。
espanolEl desarrollo de los materiales refractarios basicos ha estado asociado a cambios experimentados en los procesos siderurgicos, particularmente en el area de los convertidores. En el presente trabajo se hace una revision pormenorizada de su evolucion desde los materiales convencionales de dolomia aglomerados con…
ポリ乳酸はいわゆるポリエステルの1種で, 生分解性を持つポリマーである. 本実験では, 数平均分子量6.6×105のポリ乳酸を製膜し, このフィルムに紫外線照射し, 分解挙動を調べた. 紫外線照射開始後の15分経過で分子量は半分にまで下がり, 1時間経つと1/4となった. この低下は紫外光がポリマー鎖をランダムに切断したために起こった. 分解生成物のIR分析は, 空気または窒素気流中いずれの場合の照射でも, 3290cm-1近傍にカルボン酸の水酸基に帰属される吸収の増加を示した. この増加は, 主鎖切断により生成したカルボキシル基末端の生成によるものである. さらに照射時間に対するフィルム重量減少も測定され, 重量減少は, 窒素雰…
Effects of CaO and SiO2 addition on microstructure and intrinsic coercivity (iHc) of sintered Sr-ferrite were investigated. The amount of CaO and SiO2 additives had direct effects upon microstructure and iHc. In CaO addition, remarkable grain growth parallel to the c-plane of Sr-ferrite crystals was observed, resultin…
Dense polycrystals of boron carbide with various compositions were synthesized by a thermal CVD method using a reaction in the BCl3-CH4-H2 system. Results of electrical conductivity and thermoelectric power measurements indicated that the thermoelectric power-factor increased with increasing boron content from B4C to…
Temperature dependences of magnetic properties and Kerr spectra of MnBi and MnBiAl films below room temperature were investigated. It was found that the saturation magnetization increases about 5% and the Kerr rotation at wavelength 700 nm increases about 20% for MnBi film when the temperature is decreased from 300 to…
The literature on radiation-induced swelling and hardening in copper and its alloys is reviewed. Void formation does not occur during irradiation of copper unless suitable impurity atoms such as oxygen or helium are present. Void formation occurs for neutron irradiation temperatures of 180 to 550°C, with peak swelling…
The effects of (phenylethynyl)vinyldiethoxysilane (PVDES) as a crosslinker on heat-curable silicone rubber (HCSR) have been investigated. PVDES, which can, in certain specific amounts, improve the mechanical properties of vulcanizates, is a good crosslinker of silicone rubber. The tensile strength and the tear strengt…
The title compounds were prepared and some of their photophysical and photochemical properties studied. The anil (LH) and its complex with uranium (C) were found to possess very similar spectral and kinetic characteristics, namely absorption and luminescence spectra, photoisomer spectra and isomerization kinetics. Fro…
SiC based ceramics have excellent properties in strength, hardness and chemical stability at high temperatures. Such attractive characteristics make them promising condidates for high temperature structural or wear and corrosion-resistant materials. On the other hand, carbides, nitrides or borides of transition metals…
Abstract
An investigation was carried out to assess the corrosion resistance of duplex stainless steel that was surface alloyed with ruthenium. It was found that vapour deposited ruthenium on the surface of a duplex stainless steel improved the corrosion resistance, especially if the alloy is annealed after surface deposition…
L-Amino acids combined with the atropisomeric porphyrins, meso-tetra(o-aminophenyl)porphyrin and meso-tetra(o-carboxyphenyl)porphyrin, induced circular dichroism at the Soret band of porphyrins to an extent which depended on conformation.
Alkaline ethylenediamine tetra-acetic acid (EDTA) is a useful chemical cleaning agent used in many heat exchange systems for removing magnetite. For steel systems, especially at temperatures in the range 70–150°C, high corrosion rates can occur. It has been assumed, to date, that this is due to chelation effects but t…
A partially relaxed constraints grain deformation model is proposed to explain the influence of temperature on the rolling textures of fcc metals. The effects of the grain plastic shear in the TD/RD plane and the role of the rate sensitivity of crystallographic slip on the evolution of the texture have been investigat…
The susceptibility to hydrogen embrittlement in martensitic steels containing Cr, Ni and Mo under stress and hydrogen diffusion have been investigated by electrochemical methods. As the content of alloying elements was increased, the apparent diffusion coefficient of hydrogen (D) and the threshold hydrogen permeation…
To study the effects of the fictive temperature, Tf, and the OH-group on the refractive index, n, of silica glass, several samples were prepared containing from 680 to 850wt ppm of OH-group in different distribution patterns. Trimethoxymethylsilane was used as a raw material and hence the samples contained no detectab…
The crystal structure of LiNbO3 with congruent composition was refined at room temperature by means of the single-crystal X-ray diffraction method under consideration of anharmonic thermal vibration. The space group is R3c with the hexagonal cell dimensions of a=5.15020(6) and c=13.8653(4) Å and Z=6. Large residual el…
Abstract Ellipsometry was used to study solid‐surface energetic and temperature effects on the apparent equilibrium adsorptive behavior exhibited by β‐lactoglobulin. Adsorption isotherms were constructed for β‐lactoglobulin on seven different silicon surfaces chemically modified to exhibit varying hydrophobicities: pl…
The conditions for the use of Electron Spectroscopic Imaging (ESI) in the observation of DNA molecules adsorbed on carbon film are described. The Zeiss 902 electron microscope with its built-in spectrometer allows original modes of imaging, such as energy-filtered annular dark-field. The six different modes of imaging…
The orientation of the smectic-A and -C* layers, inside 25 μm pores of glass capillary arrays, has been studied by high-resolution x-ray diffraction. The pores were coated with lecithin in order to ensure perpendicular anchoring of molecules at the surface. A chevron-like layer structure was seen in the smectic-A phas…