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 explicit forms of the density-density correlation function H( Delta x,z 1 ,z 2 ) for the transverse separation Delta x approximately W 2 , where W is the interface thickness, are obtained in the two-dimensional solid-on-solid model in two different asymptotic cases of a finite system in a vanishing external field.…
The Madelung constant-essentially the Coulomb energy density of a crystal-is usually calculated via Ewald error function expansions or, for the simpler cubic structures, by the 'cosech' series of modern vintage. By considering generalised functional equations for multidimensional zeta functions, the authors provide ex…
Assuming that deformation is caused solely by dislocation glide and mechanical twinning, with negligible strain rate sensitivity, the plastic behavior of crystals is described by a polyhedron in stress space, the single‐crystal yield surface (SCYS). Each facet of the SCYS represents the yielding condition on one slip…
We propose a simple density-functional theory for the isotropic-nematic transition of a system of hard ellipsoids which yields results in fair agreement with the computer simulation studies and which reduces exactly to Onsager's theory in the limit of infinitely dilute systems of infinitely long ellipsoids. When the f…
We report 77-K electroluminescence from an irradiated carbon-rich silicon diode that has an internal quantum efficiency more than 103 times higher than that of band-to-band recombination in an unirradiated, but otherwise identical diode. This is achieved by creating optically active Cs-SiI-Cs complexes with room-tempe…
Hydrogenated amorphous carbon (a-C:H) films, deposited onto negatively biased substrates in a 13.56-MHz hydrocarbon glow discharge system, have been investigated by mass spectroscopic thermal effusion measurements. Depending on the bias voltage UB as the most important deposition parameter, hydrocarbons and/or H2 mole…
Abstract The effect of stretching condition on stress‐induced crystallization of amorphous polyethylene terephthalate (PET) film has been studied. Cast PET film was stretched at 85°C with stretching rates ranging from 100% per minute to 600% per minute for various stretching ratios. The stretched film samples were ann…
Abstract Electro‐copolymerization of methyl acrylate, acrylic acid, methacrylic acid, acrylamide, and methyl methacrylate with acrylonitrile onto graphite fibers has been successfully done in our laboratory. The coatings are relatively uniform and their properties, especially their modulus, can be systematically varie…
Abstract The effect of oxidative and thermal aging of EPDM raw rubber and rubber vulcanizate on gelation, network structure, and techical properties has been studied over a wide range of temperatures and times of aging. Three grades of EPDM having different types of diene have been considered. The kinetics of aging of…
Using the high-Q mechanical-oscillator technique we have measured the sound velocity and mechanical dissipation of high-purity single-crystal silicon as functions of temperature (0.005--4.2 K), frequency (0.6--6.0 kHz), and strain amplitude (${10}^{\mathrm{\ensuremath{-}}5}$--${10}^{\mathrm{\ensuremath{-}}8}$). In the…
Concentrated suspensions of submicron colloidal spheres were studied both by dynamic light scattering and by direct observation of their phase behavior. In agreement with recent theory and computer simulation, the measured dynamic structure factor developed an essentially nondecaying component, implying ``structural a…
Abstract : Measurements were conducted to determine the impedance of the electrochemical interface on rotating disk specimens of pure copper and commercial 90-10 and 70-30 copper-nickel alloys over a 28 day period while immersed in an aerated aqueous 3.4% sodium chloride solution. A sinusoidal voltage was applied to t…
The performance of 100% cotton open-end and ring spun yarns on an air-jet loom and their behavior in corduroy fabric are investigated. The amount of twist loss and the twist distribution across the fabric width are determined. The effects of changing yarn count and original twist level on the retained twist and on fab…
This paper describes a mathematical model for ferroresonant circuits that addresses some of the deficiencies of earlier analyses of ferroresonant regulators. Derived using piecewise-linear, normalized differential equations, the model accommodates nonlinear behavior and predicts circuit performance in terms of paramet…
Abstract Porous and electrically conducting clay-carbon composite, which is produced by sintering of mixtures of clay and porous carbon, shows large electrostatic capacitance (ca. 10 F cm−3). By using the composites, electric double-layer capacitors with capacitance of 2.3–3.4 F/(cm3 of the capacitor) have been prepar…
An assessment has been made of the ability of the Wet Bulb Globe Thermometer Index to predict heat stress in men wearing NBC clothing while working at a moderate to heavy rate under a range of environmental conditions. Results showed that such an Index had no predictive value under these conditions and that the work r…
Abstract New polysulfide polymers were prepared by a new process from vinyl monomers, elemental sulfur, and sodium metal in THF. The kinetic study of the reactions at −40°C has shown that the overall process can be described by the competition between a slow reaction (initiation of the monomer by the alkali metal) and…
The mechanical behavior of silicon carbide exposed to molten lithium was evaluated at exposure temperatures from 200° to 1000°C. For temperatures up to 600°C, there was little change in strength and the fracture was controlled by preexisting surface flaws on the specimen surface or edges. Above 600°C, two strength pop…
Polymer-solvent interaction parameters for the blends of natural rubber (NR) with styrene-butadiene rubber (SBR) and polybutadiene rubber (BR) are calculated using the Flory-Rehner equation by equating the network density of the vulcanizates in two solvents.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal oxidation kinetics from the viewpoint of a physicist: the microscopic motion of charged defects through oxidesAlbert T. Fromhold Jr.Cite this: Langmuir 1987, 3, 6, 886–896Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published i…