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 connection between cleanliness of semiconducting compounds and water tree growth at the semiconductor-dielectric interface was demonstrated. Changes to semiconducting compounds have improved the reliability of solid dielectric cables.>
We show that two types of fingers exist in homeotropic samples of cholesteric liquid crystals of positive dielectric anisotropy : fingers of a first species in which the director field is continuous, and fingers of a second species which are topologically singular and of the same nature as spherulites (also called cho…
Abstract Melt crystallization processes are in use as suspension or as solid layer processes. The purification efficiency of such melt crystallization processes can be improved by further purification steps such as sweating and washing. Here a mathematical description of experimental results which come from a solid la…
Solid-solution Sr2 –xLaxFeO4 crystallizing in the K2NiF4 structure has been obtained for 0 ⩽x⩽ 1. In the Sr-rich region, the K2NiF4 structure was stable only at low temperature. Heat treatment under an oxygen pressure of 100-500 atm was carried out to form oxygen stoichiometric samples. The structure was refined by th…
The reaction of (Bu4N)[V5O7(OMe)2(PhPO3)5] with aqueous HCl in methanol followed by treatment with diethyl ether yields dark brown crystals of (Bu4N)2[(V8O16){V4O4(H2O)12}(PhPO3)8Cl2]·2Et2O·2MeOH·4H2O 1, a mixed-valence VV–VIV cluster consisting of two (V4O8)4+ caps each bridged through four PhPO32– groups to a centra…
The σ-acetone complex [Fe(η5-C5Me5)(η2-dppe)(σ-OCMe2)]+ OSO2CF3–, (2 dppe = Ph2PCH2CH2PPh2) is cleanly synthesised by treatment of the hydride compound [Fe(η5-C5Me5)(η2-dppe)H]1 with MeOSO2CF3 in Et2O followed by crystallization from acetone–pentane; this compound, characterized by a single crystal X-ray diffraction,…
The influences of Mn of the recrystallization behavior and the formation of recrystallization texture in Ti-added ultralow-C steels were investigated and compared with that of low-C Al-killed steels. In Ti-added ultralow-C steels, Mn does not influence the recovery, the nucleation and growth rate of recrystallization,…
We calculate the continuous dependence of structure and shape of tangentially anchored nematic liquid-crystal microdroplets on the parameters of anchoring strength ${\mathit{w}}_{0}$ and radius r, at fixed temperature, using a numerical relaxation method and Landau--de Gennes theory. The structure is characterized by…
The chemistry of chromium in the passive film on sputter‐deposited chromium and thin films has been investigated in situ in an electrochemical cell under potential control by studying x‐ray absorption near edge structure. At high potentials, Cr in the alloys was oxidized to the 6‐valent state. Depending on the rate of…
The differential heats and the adsorption isotherms of water on α-Al2O3 have been measured at five different temperatures in the range 200–400 °C using a microcalorimetric–volumetric apparatus. The amounts of water adsorbed and integral heats decreased with increasing temperature. At all temperatures the differential…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(aryl prehnitimide)sZhi Yuan Wang and Yu QiCite this: Macromolecules 1994, 27, 2, 625–628Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.org/doi/10.1021/ma00080a048https://doi.org/10.1…
New polyetherurethanes carrying fluoroalkyl substituents in the side chains were synthesized from N,N-di(hydroxyethyl)heptadecafluorooctyl-sulfonamide (a chain extender), 4,4'-disocyanatodiphenylmethane, and poly(tetramethylene glycol). Various kinds of polyetherurethanes having different tensile properties were prepa…
An overview of the present knowledge about the effect of ionizing radiation on properties of cholesteric liquid crystals is given. It includes the effects caused by either electromagnetic radiation or particles. Particular attention has been paid to the liquid-crystalline properties of cholesterol derivatives and thei…
The immobilisation of heteropolyacids into polyaniline films has been studied using the probe beam deflection technique, X-ray photoelectron spectroscopy and scanning electron microscopy. The results indicate that the heteropolyanions modify the redox behaviour and morphology of polyaniline.
β-Octasubstituted tetramesitylporphyrins have been prepared in good yields by Suzuki cross coupling of β-octabromotetramesitylporphyrin with aryl- and alkyl-boronic acids. A single-crystal X-ray analysis of -octamethyltetramesitylporphyrin 3a shows a saddled non-planar structure.
The swelling and irradiation creep behavior of cold-worked 316Ti and 15-15Ti, two variants of austenitic steels in use as core component materials of the French fast reactors, are compared. The use of 15-15Ti leads to a significant improvement due to an increase in the incubation dose for swelling. The same phenomena…
An endoproteinase, which specifically cleaves the Pro12-Leu13 bond of the extrinsic 18-kDa protein of PSII, was purified from PSII membranes of spinach. The presence of 0.05% (w/v) Tween 20 and 1 M NaCl was essential for maintenance of proteolytic activity during the purification. The molecular mass of the enzyme was…
In classical packing theory, composite packing density of a bimodal mixture is increased by increasing the component fine or coarse packing density via particle size distribution broadening. In this study, the effects of particle size distribution shape of component fine and coarse particle distributions on composite…
Since equipment, built to eliminate the NOx gas in the off gas of iron are sinter plant, is huge inci expensive, it is desirable that a more simple and economical method to eliminate the NO gas is established.The method to eliminate the NO gas near the coke in the iron are sinter bed has been studied. As a basic study…
Hexagonal BaTiO3 was formed by doping only 2mol% of Mn. Investigation of this effect of Mn in terms of its valency state and size of Mn ion revealed that the small size of Mn4+ ion is a dominant factor favoring the formation of the hexagonal phase.