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。
Knudsen effusion studies were conducted on CdO(s) in fused‐SiO 2 Knudsen cells from 889 to 1110 K. The orifice size was varied; the largest cell orifice yielded a calculated pressure significantly lower than could be accounted for by experimental error. Average‐slope‐ and average‐free‐energy‐function‐based values of Δ…
A very wide range of extremely high precision single-plane hexagonal lattice sums were calculated by computer. These sums are necessary to the Lennard-Jones interaction potential theory for hexagonal layered crystals. As an application, interplanar spacing, c-axis lattice energy, c-axis elastic moduli, and their chang…
Abstract Trialkylboranes are readily electrolyzed by using graphite as an anode in a sodium perchlorate-methanol solution containing sodium methoxide or a sodium acetate-acetic acid solution to give corresponding alkyl methyl ethers or alkyl acetates in good yields, respectively.
Single crystals of zinc have been deformed in compression along directions close to 〈1·00〉 and 〈11·0〉. High-voltage electron microscopy has been used to identify the dislocations in the deformed crystals. Crystals which deform by kinking, without significant prior plastic deformation, contain dislocations of b = ⅓〈11·…
A new calculation method of electron transport in a medium with boundaries has been developed. The method is based on the solution of the kinetic equation, written for the segments model in the continuous slowing down approximation. The distribution function is represented in the Fourier-Legendre expansion and the equ…
The results of carefully controlled laboratory experiments on contaminated flat plate insulators are presented. Flashover voltages and salt migration effects are shown for the following nine common salts: NaCl, NaNO3, Na2SO4, MgC12, Mg(NO3)2, MgSO4, CaCl2, Ca(NO3)2, and CaSO4. Our results show that the tendency for an…
This article modifies the Almon polynomial distributed lag to allow for a lag of infinite length. Estimation of the model is considered, and an empirical example is given to illustrate the usefulness of the model
The effects of tensile and compressive stresses applied parallel to the magnetic flux path were observed on specially shaped specimens cut from blocks of low-loss MnZn ferrous ferrite typical of those used for inductor cores. The permeability, losses and coercivity were observed as functions of temperature. Stress lev…
A simple and versatile electron biprism of the Mollenstedt type is presented, which allows the conversion of a Siemens Elmiskop 101 electron microscope for use as an interference microscope or as an electron interferometer. The microscope's performance with the biprism inserted at the level of the selector aperture pl…
Abstract Dynamic properties of vulcanizates have been measured at small and large extensions, up to specimen rupture, by means of a modified Rheovibron. The influence of temperature, frequency, and amplitude on the dynamic moduli has been determined for a number of SBR samples, uncharged or charged with silica or carb…
Summary Shallow friable red soils (euchrozems) and shallow cracking clays (black earths) occur in close proximity on basalt hills of the Darling Downs of Queensland. The euchrozems are mainly restricted to fiat hill crests and are associated with lithosols; the shallow black earths occur on upper pediment slopes, on s…
Abstract The industrially important reaction of phenol and acetone to give bisphenol A and water was catalyzed by beads of ion‐exchange resin (sulfonated styrene‐divinylbenzene copolymer) suspended in a batch reactor containing liquid reactants. The data are summarized by a rate equation accounting for reaction in the…
Changes in the structure of electroplated and vapor-deposited copper thin films, as a result of isothermal and isochronal annealing in the temperature range 100–500 °C, have been investigated by x-ray diffraction and metallographic techniques. In the electroplated films, recrystallization occurred with an activation e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of a silylene addition reactionPeter P. Gaspar and Rong-Juh HwangCite this: J. Am. Chem. Soc. 1974, 96, 19, 6198–6199Publication Date (Print):September 1, 1974Publication History Published online1 May 2002Published inissue 1 September 1974https://pubs.acs.org…
In compressed gas insulated systems, the problems of the conducting particles, which are suspected to cause the irregular breakdown in SF6 gas, are serious matter for design engineers. In this paper the effects of conducting particles and insulating fibers are described under alternating, impulse and alternating-impul…
The infrared spectra of polycrystalline hexamethylenetetramine-h12 and -d12 (HMT-h12 and HMT-d12) at 300 and 100°K, and the Raman spectra of polycrystals, single crystals, and saturated aqueous solutions of HMT-h12 and HMT-d12 at 300°K, have been recorded. The infrared spectra and the Raman spectra of the single cryst…
Abstract High resolution electron micrographs of undistorted carbon—rubber gel were obtained by ultramicrotomy of frozen unvulcanized SBR compounds which were subsequently extracted with benzene to remove any soluble rubber. The remaining black and rubber form a 3-dimensional, meshlike network which is larger than the…
To determine the compound distribution formed by surface catalysis, mixtures of Co, D2, and ND3 were heated with nickel-iron or montmorillonite clay catalysts for 49-214 h at C. Compounds identified include most of the known polyatomic interstellar molecules, as well as homologous series of acetylenes, dienes, alcohol…
Monte Carlo calculations for 108- and 256-particle Lennard-Jones systems have been carried out at 140 temperature-density points in the vicinity of the fluid-solid phase transition. Several types of initial configurations have been used, including fcc lattice arrays, disordered arrays, and combinations of lattice and…
Abstract Hydrolyzed starch–polyacrylonitrile (H‐SPAN) graft copolymers form highly viscoelastic mixtures with water, even at concentrations less than 1% by weight. In many ways these mixtures behave like ordinary polyelectrolyte solutions, but dilution experiments revealed that linear reduced viscosity–concentration p…