Materials Literature
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The effect of high direct voltage on the formation and dislodging of water drops hanging from a smooth conductor will be shown and used to explain the resulting corona characteristics, such as pulse amplitude and repetition rate, audible noise, radio influence (RI) and loss current, and corona current waveforms. Pheno…
Abstract Mises' yield criterion, the Prandtl‐Reuss relation between stress and plastic strain rate, and Hencky's theorem on shear lines for isotropic elastic‐plastic materials are derived from the theory of continuous distributions of dislocations. A linear relation between the velocity of dislocations and the gliding…
Abstract The dislocation structure produced by tensile deformation of magnesium single crystals at 77 K and at room temperature has been investigated by transmission electron microscopy techniques. Sections both parallel and perpendicular to the basal plane have been cut by spark machining from single crystals deforme…
Abstract
A new type yielding phenomenon was observed in Al-Mg and Al-Cu alloys which were pulled at high temperatures above about 350°C. In order to determine characteristics of this high temperature yielding phenomenon, several binary aluminium alloys were investigated by tensile tests at various temperatures from room temper…
The thermodynamic stability of tetragonal germanium dioxide has been characterized by measurements of the equilibrium ratios in the temperature range 830°–1020°K. Results are extrapolated to 298°K using estimated heat capacities, to give the standard thermal parameters, and to the tetragonal‐hexagonal transition point…
Les calculs de l’effet Kerr magnéto-optique des substances isotropes sont effectués jusqu’aux termes proportionnels au carré du paramètre Q de Voigt. Dans le cas du fer, la correction à apporter à l’approximation linéaire est de l’ordre de quelques secondes d’arc. Quelques graphiques illustrent les principaux résultat…
Optical absorption and emission spectra of trivalent ytterbium in various chelates are reported. The experimental energy levels of Yb3+ are compared with predictions of electrostatic crystal-field theory and of a contact model of ligand-field theory. Good agreement is found between theory and experiment for the electr…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Abstract For structures with hexagonal symmetry, three different axial systems (rhombohedral, orthorhombic, and hexagonal) are in general use to define the indices of directions and planes. The hexagonal axial system is the one in which confusion is most likely to occur if the axes and the notation are not clearly def…
Results of BET adsorption measurements on a‐c and d‐c sulfuric acid anodic films on aluminum have been compared with results of pore counts and with coating ratio figures. Both real surface and volume were measured. A roughness factor should be introduced in order to obtain an agreement between data from different sou…
A technique has been developed to measure the 60c/s a.c. intrinsic electric strength of organic polymers. This technique consists in embedding the electrodes and film to be measured in a thermoset resin. The solid construction eliminates prebreakdown discharges on the film surface from the breakdown of liquid used in…
N. S. Anderson and D. A. Rees, J. Chem. Soc., 1965, 5880 DOI: 10.1039/JR9650005880
A singular-perturbation expansion of the electric field and the concentrations provides a rigorous justification for dividing an electrolytic solution into ' the diffuse part of the double layer at an interfac~ and a diffusion layer on the solution side of the interface. At the same time this expansion provides a mean…
Important applications in data storage, pulse-field measurement, wave propagation and the study of magnetic crystals are likely to be found for a recently reported class of materials. These magnetoelectric materials, as they are called, become magnetised in an electric field and electrically polarised in a magnetic fi…
Abstract The permeabilities, diffusivities and solubilities of He, Ne, A, O 2 , N 2 , Kr, CO 2 , H 2 S, and H 2 O in poly(ethyl methacrylate) have been measured above and below the glass temperature. Water showed a small increase in solubility when the polymer was heated above the glass temperature. Water also showed…
D. J. Greenland, R. H. Laby and J. P. Quirk, Trans. Faraday Soc., 1965, 61, 2013 DOI: 10.1039/TF9656102013
Abstract The thermal expansion of wood constituents has been measured dilatometrically both in the dry and the water‐swollen state. Dry measure meats were made with mercury as the confining liquid on samples pressed into dense pellets at elevated temperatures and pressures. Between −30 and 30°C, the thermal expansion…
Numerous tests have shown that Alloy 600, a 76 nickel-15 chromium-7 iron alloy, has excellent corrosion resistance in pressurized high temperature water. The present tests were undertaken to determine the influence of possible contaminants in 600 F (316 C) pressurized water on corrosion behavior, using both single and…
Abstract A model is proposed to explain the formation of slip lines in irradiated copper crystals during the propagation of the Lüders front. In this model it is shown that, due to the sweeping up of the irradiation produced defect clusters by deformation, the critical stress to produce a slip line is that required to…