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 statistical thermodynamics underlying the distribution of cations over the tetrahedral and octahedral sites in ferrospinels is developed. The temperature dependence of the distribution law is analyzed by invoking the Debye approximation for the vibrational spectrum. The resultant equations permit the internal ener…
The dielectric, piezoelectric and elastic constants of polycrystalline ceramics at room temperature are calculated by averaging those values of single crystals on the assumption that the ceramic is composed of spherical crystallites. The calculated values are in good agreement with observed ones, showing that the piez…
The saturation magnetization as a function of quench temperature is measured for the ferrite system ${\mathrm{Mg}}_{y}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$. From these data the ionic distribution of Mg ions is evaluated and compared to the theoretical thermodynamic analysis developed in th…
A general review is made of the methods of manufacture and physical properties of the following types of stretch yarn:—crimped nylon, crinkle, stretch and Ban-Lon. A general description and definitions of the physical properties of fabrics knitted from these yarns are also given. The effect of knitting stiffness (expr…
Abstract Optical properties of ZnS: (Cu+Mn) phosphors have been extensively studies with the purpose to investigate the phenomena of sensitized luminescence in photoconductive phosphors. Spectra of emission, absorption and axcitation, thermoluminescence and photo-conductivity were measured. It was confirmed from the m…
Abstract On the hypothesis that “bound rubber” is a gel of carbon black particles, the bonding agent of which consists of the longer polymer molecules, a statistical theory is developed. The probability is first computed that a rubber molecule of i segments will be attached to j carbon black particles. By means of thi…
Measurements are reported of the thermal conductivity, $K$, of high-purity $n$- and $p$-type germanium, and of a single crystal of $n$-type silicon at temperatures between 2 and 150\ifmmode^\circ\else\textdegree\fi{}K. These confirm that in silicon and in annealed germanium the thermal conductivity is limited only by…
Two fundamental concepts are defined, the effective crimp diameter and the effective wave number. The corresponding figures for these concepts are calculated from the measurements of the width values of the plane projection of a rotating fiber and from the measurements of the crimp ratio. These figures are obtained fo…
Small crystals of natural graphite showing no evidence of twinning were found in a sample of marble from the Lead Hill mine (Ticonderoga, New York). They were isolated, handled very carefully to avoid deformation, and their $c$-axis conductivity determined. It was found to be about 2\ifmmode\times\else\texttimes\fi{}$…
The thermal expansions of a number of binary lithium, sodium, and potassium silicate glasses are reported over the tempcrature range from room temperature to thcir deformation points. The expans ivities of the glasses increased with increasing alkali oxide concentration. These expansivities were used to calculate dens…
The acceleration of high temperature corrosive attack on heat-resistance alloys caused by the presence of vanadium compounds is well established. The progressive addition of sodium sulfate to the vanadium contaminant indicates that the most corrosive mixture is approximately 20 percent sodium sulfate—80 percent vanadi…
A determination of the Cu63 nuclear resonance line width in concentrated hydrochloric acid solutions containing both cuprous and cupric chloride leads to an evaluation of the bimolecular rate constant k for the electron exchange process Cu+++Cu+→+Cu++Cu++.The experimentally determined value for k is k = 0.5×108 liter/…
Neutron diffraction measurements have been made on iron at a series of elevated temperatures up to about 1000\ifmmode^\circ\else\textdegree\fi{}C to establish the magnetic scattering effects through the Curie temperature and in the $\ensuremath{\gamma}$-phase region. Diffraction patterns obtained for the face-centered…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation of Polyphosphates in Solution. I. Kinetics and Mechanism of the Hydrolysis at Branching Points in Polyphosphate Chains1Ulrich P. Strauss and Theodore L. TreitlerCite this: J. Am. Chem. Soc. 1956, 78, 15, 3553–3557Publication Date (Print):August 1, 1956Publication…
An apparatus is described to measure volumetrically the amount of gas adsorbed by a catalyst at constant pressure and at exposure times as short as 0.1 min. The volumes of oxygen adsorbed by a technical silver catalyst at pressures of 200, 400, and 700 mm. and in the temperature range of 180° to 300°C. have been measu…
During neutron irradiation at 100°c alpha uranium creeps slowly (e.g. 10−−7 per hour) under external stresses of order of one-hundredth of the normal yield stress of the metal at that temperature. This effect is predicted as a consequence of the phenomenon of “radiation-growth” which occurs in uranium, and is then con…
The magnetization of some rare-earth orthoferrites and related compounds, and of some iron-group cyanides, has been investigated at temperatures between room temperature and 1.3\ifmmode^\circ\else\textdegree\fi{}K. Some are ferromagnetic, some antiferromagnetic, and some paramagnetic following the Curie-Weiss law.The…
Journal Article Clays and Clay Minerals Get access Clays and Clay Minerals, Edited byAdaSwinepord, Norman Plummer, Proceedings of the Second National Conference on Clays and Clay Minerals. National Academy of Sciences-National Research Council, Washington, D. C, 1954. viii pp. Illus., index, bibl. R A Heindl R A Heind…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Plutonium-Hydrogen System. II. Solid Solution of Hydrogen in Plutonium Dihydride1Robert N. R. Mulford and Gladys E. SturdyCite this: J. Am. Chem. Soc. 1956, 78, 16, 3897–3901Publication Date (Print):August 1, 1956Publication History Published online1 May 2002Published in…
The' linear t he rm a l ex pa nsion of fOlll samples of T eflo n was de termined . The' res ults for an neil. lecl T eflon m'e indi cated in a plot of t he ex pa nsion vel s us te m perature and in iI. table li st in g t he average coeffi cLCnts of lincar expa ns io n from -J 90 to + 300 C. The eff ect of internal r e…