Influence of dislocations on diffusion kinetics in solids with particular reference to the alkali halides
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Materials Literature
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The Corrosion and Oxidation of Metals
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Free-Volume Model of the Amorphous Phase: Glass Transition
Free volume vf is defined as that part of the thermal expansion, or excess volume Δv̄ which can be redistributed without energy change. Assuming a Lennard-Jones potential function for a molecule within its cage in the condensed phase, it can be shown that at small Δv̄ considerable energy is required to redistribute th…
The polymerization of silicic acid obtained by the hydrothermal treatment of quartz and the solubility of amorphous silica.
The polymerization of silicic acid in the solution obtained by treating quartz with water at temperature 400℃ and under a specific volume of water 1.6ml/g was investigated from the changes in the concentration of molecular silica, the results were compared with those already reported, in which the silicic acid prepare…
Some Optical Properties of CdSe Single Crystals
Optical transmission and reflection measurements were made on a single crystal of CdSe (crystal class ${C}_{6v}$) with light polarized parallel and perpendicular to the $c$ axis. The absorption coefficients, ${\ensuremath{\mu}}_{\ensuremath{\perp}}$ and ${\ensuremath{\mu}}_{\mathrm{II}}$, were determined and are prese…
Neutron Diffraction Studies of Chromium-ModifiedMn2Sb
Existence of a ferrimagnetic to antiferromagnetic phase transition with decreasing temperature in Mn2Sb modified with 2.3 weight percent chromium is confirmed by neutron diffraction.Received 5 July 1960DOI:https://doi.org/10.1103/PhysRev.120.1969©1960 American Physical Society
Color Centers in Cesium Halide Single Crystals
Color centers have been investigated in the CsCl-type alkali halides. Cesium chloride, bromide, and iodide single crystals were grown from the melt and CsCl crystals also from solution. Coloration was produced by 130-kv x rays, 3.0-Mev electrons, and by electrolysis. In CsI coloration resulted from electrolysis only.…
Considerations on the Propagation and Generation of Magnetostatic Waves and Spin Waves
A discussion is given of the dispersion relation, magnetization distribution, and group velocity of magnetostatic waves in an infinite circular cylinder with the static magnetic field parallel to the cylinder axis. The dispersion relation of the modes with ${e}^{i\ensuremath{\phi}}$ angular dependence is, for $\mathrm…
Arrangement of dislocations in iron
Abstract The arrangement of the dislocations has been studied in iron in various conditions, namely annealed, cold-worked, recovered and after creep. In all conditions the dislocation network is characterized by attractive intersections where two dislocations join to make one dislocation, and there is convincing evide…
Physique Nucleaire
By Michel Bayet Paris : Masson et Cie. Pp. 404. Price 65 NF. This is essentially a text book based on other textbooks and in a subject that changes as rapidly as nuclear physics this is just not good enough. The author disarmingly reveals these secondary sources in the preface.
Thermoelectric Energy Conversion
This article is focused on thermoelectric cooling (TEC) and thermoelectric power generation (TEG). Detailed theoretical modeling and characterization were presented with the key performance highlighted. Heat transfers from heat sinks on both hot and cold surfaces of the thermoelectric models were discussed and measure…
Experimental Investigation in Lead of the Whipple ``Meteor Bumper''
Experimental results are presented to indicate the effects of a thin protective shield on reducing the penetration of simulated meteoroids. The study is mainly of lead impacting lead at 2.5 km/sec. The effects of thickness and separation of the shield are investigated. It is shown that a shield of thickness slightly l…
93—STUDIES ON THE FELTING PROPERTIES OF SOUTH AFRICAN MERINO WOOLS
A laboratory technique, closely simulating industrial practice, has been developed for the examination of the relative feltability of scoured Merino wools. The extent of feltability is evaluated in terms of breaking load and porosity to air of the resultant felt. Whilst it is confirmed that fine wools will give a less…
Image formation by electron bombardment of metal targets
In a demountable vacuum system a latent image is formed of a region on a metal target which has been subjected to very weak electron bombardment. This image can be made visible by electroplating the target in a copper sulphate solution. An experimental investigation of the influence of bombarding current, electron ene…
The Johns Hopkins University and Diffraction Gratings
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text John Strong, "The Johns Hopkins University and Diffraction Gratings," J. Opt. Soc. Am. 50, 1148-1152 (1960) Export Citation BibTex Endnote (RIS) HTML P…
The synthesis and crystallography of brannerite, [Part] 10 of Studies of radioactive compounds
Precession and Weissenberg films of a single crystal of synthesized brannerite show that the compound is monoclinic, C2/m with a = 9.87, b = 3.76, c = 6.95 Aa, beta = 119 degrees 309. The cell contains 2[UTi 2 O 6 ]. Sp. gr. (meas.) = 6.35, (calc.) = 6.36. The cell constants and space group are compatible with the for…
Macromolecules with groups of high reactivity
Abstract Reactions on the reactive groups of macromolecular substances (e.g., cellulose) have long been known, even since before the structures of macromolecules were understood. H. Staudinger carried out numerous reactions with macromolecules, maintaining the degree of polymerization constant, in order to substantiat…
Flexural Strength of Specimens Prepared from Several Uranium Dioxide Powders; Its Dependence on Porosity and Grain Size and the Influence of Additions of Titania
Flexural strengths of specimens prepared from four uranium dioxide powders were determined at room temperature and at 1000°C. The relation of the strength (S) to porosity (P) and to grain size (G) could be represented by the expression S = kG −a e −b P , where k, a , and b are empirical constants which differed with t…
102—THEORETICAL CONSIDERATIONS OF BENDING AND CREASING IN A FABRIC
A mechanistic analysis of fabric flexure is outlined, relating fabric behaviour to fibre properties through the geometry of the structure, particularly as it is affected by fibre interactions. The influence of two factors is discussed : first, the degree of fibre association or clustering which exists within the yarn;…
Degradation and crosslinking of polyisoprene in Hevea Brasiliensis latex during processing and storage
Abstract It has been found that storage hardening in rubber is inhibited by certain amines and reagents for carbonyl compounds. The technological importance and theoretical significance of these observations are discussed. It is postulated that carbonyl groups present in the rubber molecule are responsible for crossli…