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 available data on secondary emission yields from electron bombarded polymers was reviewed to identify those features they have in common with metals and inorganic insulators. As in the case of the more widely studied materials it was found that when the yield δ obtained at a bombarding electron energy Eo, is divid…
Three-pointed planar Si4 stars with unelucidated bonding and planar Si5 rings have been found in Li12Si7. In the formulation shown below with x = 4 and y = 10 the star could be an excited tetrahedrane state as Si; for x = y = 8 the star would be Si and isoelectronic with the carbonate ion.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncreased yield of a desired isomer by equilibriums displacement on binding to silica gel, applied to meso-tetrakis(o-aminophenyl)porphyrinJonathan LindseyCite this: J. Org. Chem. 1980, 45, 25, 5215Publication Date (Print):December 1, 1980Publication History Published online…
Attention was focused on the first steps in the pitting process, the adsorption of aggressive anions and the dissolution of aluminum oxide. The adsorption of chloride on alumina and aluminum powder are quite similar and show a saturation plateau at high chloride concentration; the amount of chloride adsorbed is propor…
The degree of alteration in clinopyroxenes from eclogitic inclusions in South African kimberlites is directly related to the deviation from stoichiometry of remnant unaltered areas in individual grains. Deviations from stoichiometry are reconciled by allowing up to 9% vacancy in the M2 site. The breakdown reaction acc…
Explicit expressions are given for the stress fields of extrinsic or intrinsic boundary dislocation arrays on the basis of recent results concerning the elastic properties of interfacial dislocations. It is shown that these stress fields differ only by constant terms. Examples of α-β brass boundaries illustrate anisot…
We present a model of the V${\mathrm{O}}_{2}$ phase transition which incorporates both electron-electron and electron-lattice interactions and accounts for the presence of two $d$ bands (${\ensuremath{\pi}}^{*}$ and ${d}_{\ensuremath{\parallel}}$) overlapping at the Fermi level of the metallic phase. Attention is give…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence and photoreduction of vanadium pentoxide supported on porous Vycor glassMasakazu Anpo, Ichiro Tanahashi, and Yutaka KubokawaCite this: J. Phys. Chem. 1980, 84, 25, 3440–3443Publication Date (Print):December 1, 1980Publication History Published online1 May 2…
The influence of TiO, on the structure of silicate melts has been determined at I atm pressure by laser Raman spectroscopy. The following melt compositions were used: CaSiOr, CaMgSirOu, NarSiOr, NaAlSi3Os, CaAl2OE, and NarTiOr. Titanium is in four-fold coordination in all melts studied, as there are no Raman bands bel…
Biomechanical testing of connective tissue is usually done on whole tissue. Studies of the mechanical properties of each component of the tissue, however, are important for elucidating the connection between the functional properties and the molecular structure. Enzymic degradation of one component at a time followed…
A simple nonlinear theory of viscoelasticity has been developed for application to elastomers. The theory is the viscoelastic generalization of the kinetic theory of rubber elasticity, and it is used to model time and rate-dependent effects. The method of derivation reveals that the theory is applicable to stress-impo…
Abstract The vulcanization of RTV (=room temperature vulcanizing) silicone rubbers under the action of organotin compounds is investigated. The mechanism for the cure is inferred from the chemical properties of a variety of relevant organotin compounds and is illustrated with the reactions that occur when dialkyltin d…
Polarised and unpolarised neutron measurements have been carried out on a YCo 5 single crystal. These have allowed the crystal structure to be refined and the magnetisation density distribution of this compound to be determined. The analysis of these results indicates that the moment of one of the two cobalt sites (Co…
Infrared reflection spectra of strontium titanate are reported as obtained with a scanning interferometer from room temperature up to 1200 K. A fit of the factorized form of the dielectric function to reflectivity data yields the temperature dependence of TO and LO frequencies, dampings, and TO oscillator strengths. T…
The swelling of cellulose gel is considered to be caused by an osmotic pressure differential resulting from a difference in concentration of mobile ions between the interior of the gel and the exterior solution. The fundamental feature within the gel, bringing about the unequal distribution, is the presence of ionizin…
Summary Examination by infrared spectroscopy and electron microscopy of the fine clays (<0.5 μm) dispersed at pH 3.5 from H 2 O 2 ‐treated soil indicates that imogolite and proto‐imogolite allophanes are concentrated in podzolic B 2 and B 3 horizons, and make up at least 6 percent of one B 2 horizon soil, which con…
Aberration-corrected concave gratings with curved and variable spacing grooves are ruled with a numerically controlled ruling engine. In the design of aberration-corrected concave gratings, mechanical methods allow more freedom to choose the amount of space variation than do holographic methods. A highly efficient vis…
Abstract The thickness of the two-layer ethylene glycol complex of dioctahedral smectites varies under room conditions between 17.3 and 16.5 Å because of such factors as layer charge density, type of interlayer cation, and relative humidity. Neglecting this variability can give up to 30% error in the X-ray powder diff…
Not available