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。
Abstract Weatherability of several UV stabilized and unstabilized grades of LEXAN® polycarbonate (PC) was studied by exposure in a xenon arc lamp weather‐o‐meter. The tensile properties of thin (0.2 to 0.3 mm) compression molded and thick (3.4 mm) injection molded samples were investigated as a function of exposure ti…
The reflection spectra from a monodomain cholesteric liquid crystal are measured for obliquely incident light. The first order reflection region is found to be divided into three regions at a large angle of incidence. The central region shows high reflectivity irrespective of incident polarization and is attributed to…
Abstract Owing to their low cost phosphorus fire‐retardants find vast application in making fire‐retardant cellulosic compostions. They have been used both as a physical additive as well as part of the polymer structure. Acid forming phosphorus compounds are generally effective in cotton and other cellulosic. Acidic r…
Abstract The problem of dislocations emerging at free surfaces is considered. This complicated threedimensional elastic problem can be reduced to a superposition of two‐dimensional fields of infinite straight dislocations which are well defined. A plane fan‐shaped distribution of infinite straight dislocations is intr…
Line groups can be used in symmetry considerations of quasi-one-dimensional systems (as well as their spin subsystems), stereoregular polymers, chain-type crystals, etc. Each line group is expressed in the form of a weak-direct product of two of its subgroups. One of them is an axial point group, describing the symmet…
The corrosion behavior of pure iron in diluted (inhibiting) and moderately concentrated (aggressive) polyphosphate solutions has been re‐examined in the light of the results of surface analyses of iron samples by means of x‐ray photoeleetron spectroscopy. The passive film responsible for the anodic control of the corr…
The monocarbonyl complexes of (phthalocyaninato)iron(II), FePc(CO)L, where L = NJVdiethylacetamide, pyridine, piperidine, \nhexamethylphosphoramide, and triphenylphosphine oxide, have been prepared and characterized, as has the dicarbonyl \ncompound FePc(CO)2, which was isolated after exposing FePc i…
The primary lithium aluminosilicates in pegmatites are spodumene (a-LiAlSizOe) and petalite (LiAlSi4Or0). These minerals are frequently replaced by fine-grained assemblages of eucryptite (a-LiAlSiO+), albite, micas, and clay minerals as a result of subsolidus cation exchange reactions with residual pegmatitic fluids.…
Keywords BRIAN COLQUHOUN, CONSTRUCTIONAL STEEL RESEARCH AND DEVELO, PMENT ORGANISATION, WARWICK UNIVERSITY TENSION, FIELD, ACTION, COMPOSITE, PLATES, GIRDERS, TESTS, FAILURES, NEGATIVE, MOMENTS, STEEL, WEBS, SLENDER, STIFFENED, INTERACTION, PANELS, SHEAR, CONNECTIONS, SLABS, LIGHT, STEEL, TOP, FLANGES, ULTIMATE, STREN…
Abstract The theory of magnetic resonance Raman optical activity in metal porphyrins is developed. Irreducible tensor methods are used to calculate the transition polarizabilities (involving both symmetric and antisymmetric contributions) which are formulated in terms of a vibronic development of the Raman transition…
Measurements of dc electrical conductivity and emf of single crystal and polycrystalline α‐Al 2 O 3 doped, respectively, with 100 and 300 ppm yttrium show that yttrium, although isoelectronic with aluminum, is a donor. The electronic energy level of the donor is attributed to O 2‐ next to Y 3+ , its level being forced…
Abstract A polytype of InSe single crystals is determined to be of γ‐type by means of X‐ray Laue and diffractometer measurements. Polarized Raman scattering studies are carried out at room temperature and the spectra are analysed by using the normal modes of γ‐InSe. Two Raman lines of the A 1 mode (118, 228 cm −1 ) an…
Abstract Different montmorillonites (Otay, Chambers, Marnia, Camp Berteau, Moosburg, Greek White, Wyoming bentonite were deferrated with a dithionite/citrate solution; iron sulphide by-products were eliminated with an HCl washing and citrates with an H 2 O 2 oxidation. The smaller CEC after deferration could not be as…
Abstract The Upper Pliocene sediments near Lebrija in southern Spain contain commercial deposits of palygorskite and sepiolite. These sediments of continental origin consist chiefly of carbonate, marl, and clay resting on marine Pliocene quartzose sand. The lowest unit, the “Marly-Calcareous Bed,” consists of sepiolit…
Cyclopropanone hydrate irreversibly inactivates horseradish peroxidase in a time-dependent manner in the presence of oxidizing agent, hydrogen peroxide. The inhibition reaction is a second order reaction of cyclopropanone hydrate with compound I, the 2 electron-oxidized form of peroxidase, and results in covalent modi…
Magnetic susceptibilities and magnetization isotherms have been measured for single crystal FeTiO 3 . The susceptibility parallcl to the c -axis has a large and sharp peak at T N =58.0±0.3 K, while the perpendicular susceptibility is almost independent of temperature below T N . Magnetization isotherm at 4.2 K with fi…
Corrosion and fission product release from silicon carbide (SiC)-coated high-temperature gas-cooled reactor fuel particles represent a serious problem. The SiC corrosion by fission product palladium has been observed. The current results show that temperature is the major factor affecting the corrosion rate of SiC by…
A new criterion of phase separation of segmented polyurethaneureas. is found by comparing the relative crystallinity of the soft segment of polyurethaneurea. This criterion is more sensitive than the conventional thermal transition temperature measurements. The difference of crystallinity can be distinguished even if…
The nature of the deformation process involved in hot drawing of porous high-molecular-weight polyethylene was examined by apparent elongational viscosity measurements at drawing temperatures between 100°C and 150°C and deformation rates in the range of 10−6–10−3 m/s. The temperature dependence of the apparent elongat…
Growth of various species of macro-algae and diatoms was measured in culture in a range of concentrations of germanium dioxide. Growth of Laminaria saccharina was inhibited measurably at concentrations above 0.22 mg GeO2 l−1 and very markedly inhibited above 1.1 mg GeO2 l−1. Fucus spiralis was measurably inhibited at…