Materials Literature
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The general formula is derived by considering the model of a single electron moving in a central field. Approximate bound–state radial functions, accurate for large radial distances, may be obtained once the effective quantum numbers |$\nu(=n^\ast)$| are known. Bates and Damgaard have shown that such functions may be…
Construction and calibration of apparatus utilizing a solid pressure medium for phase-equilibrium studies at elevated temperatures and pressures are described. Pressure calibration is carried out by measurement of the Bi I-Bi II and T1 II-T1 III transitions. A new determination of the thallium transition, 37.1±1.3 kil…
Thermal activation energies were computed from various glow peaks of NaCl and KCl single crystals. The method developed in the preceding paper has been used successfully in these calculations. Good agreement was obtained with the results calculated from the initial rise of the glow peaks. Activation energies varied fr…
A self-consistent crystal potential is constructed for cubic BN. Exchange is included according to the Slater free-electron approximation. The effect of the heteropolar character of the potential is included explicitly in an approximately self-consistent treatment of the valence-electron charge density. The energy gap…
The effect of isotopic mass on elastic properties of solids was studied by measuring the elastic modulus of isotopically-concentrated polycrystalline specimens of metallic lithium at 25\ifmmode^\circ\else\textdegree\fi{}C. The elastic modulus of lithium-6 (96.1% ${\mathrm{Li}}^{6}$, 3.9% ${\mathrm{Li}}^{7}$) was found…
The range of 1-10 kev electrons in metals and phosphors has been measured by recording the light output as a function of energy from a sample consisting of a metallic layer deposited on a transparent phosphor layer. The measurements lead to the development of the following range-energy expression: $R=250(\frac{A}{\ens…
A new method for the evaluation of thermal activation energies from glow curves of excited crystals is described. Use is made of the symmetry of the glow peak, from which the activation energy is calculated by a simple formula: $E=(\frac{q}{\ensuremath{\delta}})k{{T}_{g}}^{2}$, where ${T}_{g}$ is the peak temperature,…
In recent years, several reports have been made on the experiments of the cavitation damage. But, for some of them, it is assumed that their cavitation impingements were severer than the real one. In this studies, more natural method (cf. Fig. 1, Photo. 1) was used for the erosion tests of the copper alloys (Sn bronze…
Successive observations of emission patterns of point cathode at high temperature after its various pre-treatments were made by using Müller's type microscope. Soon after the observation of the emission pattern, the shape of the tip was also examined under an optical microscope. As the results, it was found that the s…
Abstract not Available.
A process for the preparation of high‐purity thorium powder by calcium reduction of thorium oxide has been developed, Calcined thorium oxide is reduced in an inert atmosphere at 950°C with high‐purity calcium metal in the presence of calcium chloride. The reduction vessel is fabricated of type 446 stainless steel to a…
The phenomenon of hysteresis occurring in a series nonlinear resonant circuit has interested engineers for a long time. The phenomenon is associated in literature with a resonance occurring at a critical value of applied voltage where the nonlinear inductance, variable with the magnitude of the forcing function, reach…
G. Baddeley, B. G. Heaton and J. W. Rasburn, J. Chem. Soc., 1960, 4713 DOI: 10.1039/JR9600004713
Article Die Druckabhängigkeit der Ionenleitfähigkeit anomaler Mischkristalle von AgBr und AgJ was published on January 1, 1960 in the journal Zeitschrift für Physikalische Chemie (volume 23, issue 5_6).
The oxidation of antimony has been studied between 265° and 385°C. The reaction is characterized by an initially parabolic growth rate, which degenerates into a time‐independent rate, controlled by the gaseous diffusion of ( Sb 2 O 3 ) 2 from the surface region to the cold wall outside the sample furnace. The stationa…
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Effects of molybdenum, wolfram and copper on solubility of graphite in liquid iron were studied at 1550°C. Interaction parameters at graphite saturation were given as follows:A general approximate equation for calculating the activity coefficient of carbon in a multicomponent solution was given as follows:Validity of…
Abstract Zur Untersuchung gelangten die stark polaren Anteile (Chf‐Alk‐(2:1)‐Extrakt) der aus den Samen von Strophanthus sarmentosus var. senegambiae nach Fermentierung gewonnenen Glykoside. Es konnten darin insgesamt 32 Glykoside (I–XXIII, F–N und S) nachgewiesen werden. Sechs davon (I–VI) waren relativ schwach polar…
Investigations show that a satisfactory classification of insulating materials with respect to their resistance to deterioration and breakdown by surface discharges in air is given by time-to-breakdown tests using simple rod and plate electrodes. It is necessary to circulate dry air over specimens to avoid the formati…
The primary mode of degradation of polybenzyl at elevated temperatures in the presence of air has been found to be an oxidative attack on the methylene bridge. Initially the methylene bridge is oxidized to keto and hydroxyl groups. Later substantial amounts of acid anhydride and/or ester are formed. Extensive oxidatio…