4—MODELS OF THE PLAIN-KNITTED LOOP
This paper proposes two mathematical models of the plain-knitted loop, both based on the simple elastica, which can be used to describe the dimensional properties of a plain-knitted fabric.
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Mobility of Edge Dislocations in Silicon-Iron Crystals
A method has been developed whereby the velocity of motion of fresh dislocations introduced into a crystal by scratching the surface may be measured as a function of stress. The velocities of unpinned edge dislocations in 3¼% silicon-iron have been measured as a function of stress over a range of five orders of magnit…
Microcracks, and the static and dynamic elastic constants of annealed and heavily cold-worked metals
The existence of sub-microscopic cracks in heavily cold-worked metals has been suggested in explanation of the very large discrepancies in dislocation densities estimated from changes in density and electrical resistivity, and release of stored energy on annealing such materials. It is shown that microcracks will prod…
Theory of Magnetism of NiF2
The magnetic properties of Ni${\mathrm{F}}_{2}$ are studied theoretically with the use of a spin Hamiltonian approach. It is shown that the anisotropy of the susceptibility above the N\'eel temperature indicates a spin arrangement below the N\'eel temperature in which all the spins are perpendicular to the $c$ axis an…
A General Formula for the Calculation of Atomic Photo-ionization Cross Sections
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…
Apparatus for phase-equilibrium measurements at pressures up to 50 kilobars and temperatures up to 1750°C
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 in NaCl and KCl Crystals
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…
Crystal Potential and Energy Bands of Semiconductors. II. Self-Consistent Calculations for Cubic Boron Nitride
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…
Elastic Modulus of Isotopically-Concentrated Lithium
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…
Range of 1-10 kev Electrons in Solids
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…
Evaluation of Thermal Activation Energies from Glow Curves
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,…
Protective Potentials for Copper Alloys under the Cavitation in Sea Water
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…
Study of Point Cathode by Using Müller's Type Microscope
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…
Plasma Thermionic Converters
Abstract not Available.
Production of Thorium Powder by Calcium Reduction of Thorium Oxide
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…
Theory of ferroresonance
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…
918. The interaction of decalin and Friedel–Crafts acetylating agent. Part II
G. Baddeley, B. G. Heaton and J. W. Rasburn, J. Chem. Soc., 1960, 4713 DOI: 10.1039/JR9600004713
Die Druckabhängigkeit der Ionenleitfähigkeit anomaler Mischkristalle von AgBr und AgJ
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).
Kinetics of the Oxidation of Antimony
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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