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 The thermal decomposition of nickel hydroxides prepared from aqueous nickel chloride solution on addition of alkali under various conditions has been examined by thermogravimetry, differential thermal analysis, X‐ray diffraction study, visible and infrared spectrophotometry, magnetic susceptibility measuremen…
An airlock door modification for the JEM 100B electron microscope is described. This modification permits prefrozen specimens to be introduced into the microscope without frost forming on the specimen or the specimen warming excessively. The imaging of hydrated biological material using frozen specimens is demonstrate…
High resolution absorption and magnetic circular dichroism (M.C.D.) spectra are reported for Ru4+ (4d4) in the cubic hosts Cs2ZrCl6 and Cs2SnBr6. The spectra were recorded at liquid helium temperature over the ranges 16 000–26 000 cm-1 and 11 000–22 000 cm-1 respectively. All of the major features can be interpreted i…
A large number of products was synthesized and the flame-retardant properties on polyester/cotton blends determined. Phosphonium salt oligomers were more efficient on blends than the conventional phosphonate used on cellulosics. Among the reasons given to substantiate this conclusion is the observation that the oligom…
Abstract The temperature variations of the spontaneous magnetization and spin paramagnetic susceptibility are calculated numerically, using molecular field theory, for the combined model of localized spins and itinerant electrons proposed by Edwards for some 3d transition metals. A simple parabolic band is assumed for…
The magnetic moment and heat capacity of a 1.170 cm diam spherical single crystal of electrically polarized β-Tb2(MoO4)3 have been measured at stabilized fields of 500, 1000, 1500, 2500, 5000, 10 000, 15 000, 25 000, 40 000, 65 000, and 90 000 G, along the c crystal axis, and over the range 0.4–4.2 °K. The heat capaci…
Friction and wear-caused mechanical failures and maintenance normally have their roots in phenomena based on tribology, the science and technology of interacting surfaces in relative motion. Developments in tribology since the publication of the Jost Report have utilized existing and new knowledge from physics, chemis…
A large variety of graphitic materials have been tested in an arc heated air stream at a surface pressure of 4.3 atm and a nominal surface temperature of 3925 K. Included were commercial and developmental grades of artificial graphites, both two and three dimensional carbon-carbon composites, composites seeded with re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromism of quinolylhydrazones. III. Mechanism of isomerization of the photocolored .alpha.-quinolylimino-(Z)-hydrazone to the .alpha.-quinolylamino-(E)-hydrazoneJohn L. Wong and Mona F. ZadyCite this: J. Org. Chem. 1975, 40, 17, 2512–2516Publication Date (Print):August…
Abstract The tetraphosphorus tetraselenide P 4 Se 4 is prepared and described for the first time. It is synthetised easily by heating between 250°C and 300°C a mixture of selenide P 4 Se 3 and selenium. It exists under two allotropie forms, α P 4 Se 4 transforming in β P 4 Se 4 at 300°C. α P 4 Se 4 cristallises in the…
The magnetic properties of GdCo 2 and Gd 1- x Y x Co 2 have been observed and discussed in terms of the molecular field approximation. An appropriate set of interaction parameters reproduces the temperature dependence of the magnetization of GdCo 2 and the concentration dependence of the Curie temperature of Gd 1- x Y…
Classical analysis has demonstrated that a given quantity of active material should be deposited over the thinnest layer possible in order to minimize diffusion limitations in the porous support. This conclusion may be invalid for automotive catalysis. Carbon monoxide oxidation over platinum exhibits negative order ki…
Shock-wave propagation studies along the 〈100〉 direction in LiF single crystals are presented for three elastic impact stresses, namely, 39, 29, and 15 kbar. Present results demonstrate a stress threshold for a large increase in plastic strain rate and establish stress relaxation as a bulk property. Analysis of the da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural trends of tris(acetylacetonate)-, tris(tropolonate)-, and other tris(bidentate ligand)-metal complexes. Additional comments on the trigonal twist and ligand-ligand repulsions in octahedral D3 bidentate ligand-metal complexesA. Avdeef and J. P. FacklerCite this: In…
The surface flashover voltage over cylindrical spacers made of polyethylene in vacuum under impulse voltage application decreases monotonically with increasing temperature of the sample surface. This temperature dependence may be explained well by the mechanism that electrons injected from a cathode-insulator-vacuum j…
Abstract A sensitive technique is developed for studying the effect of As and its compounds on the permeation of hydrogen through steel membranes electrolytically charged at various pH values. Use of a rotating disc electrode permits to change pH at the cathode over a large range without changing composition of the bu…
Abstract The magnetic susceptibility of the N,N′-di-t-butyl-m-phenylenebinitroxide biradical has been measured in the temperature range from 60 to 300 K. The susceptibility follows the Curie-Weiss law, with a paramagnetic Curie constant of 0.90±0.04 K·-emu/mol and a Weiss constant of −19±2 K. This susceptibility sugge…
A simple technique has been developed which enables the examination of any uncoated insulating specimen in the scanning electron microscope at high accelerating voltages without intensity fluctuation charging artefacts. The specimens were placed in the specimen chamber which had been modified to contain a small residu…
Quantitative liquid-structure analysis using energy-scanning diffraction rather than the traditional angle-scanning diffraction is introduced. In the experimental method, white radiation and a solid-state detector are employed. This new method is inherently faster and less beset with problems of experimental instabili…
Abstract The Si/Al ratio of an hydrothermal system plays an important role in kaolinite synthesis. If the atomic Si/Al ratio of a system is greater than 2-0, kaolinite will disappear at 345 + 5°C and 2 kbars water pressure according to the reaction kaolinite + 2 quartz → pyrophyllite + H 2 O. If the atomic Si/Al ratio…