Materials Literature
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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.…
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…
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…
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.
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 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…
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…
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…
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…
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…
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 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…
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;…
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…
The activation of a band in the absorption spectrum of a type IIa diamond was accomplished using fast neutrons. The absorption spectra taken before and after a dose of 3 x 10/sup 17//cm/sup 2/ are shown. Strong continuous absorption is evidenced following irradiation, beginning sharply at the Raman energy and extendin…
Abstract The polymerization of propylene oxide at 80°C. catalyzed by aluminium trimethyl has been studied kinetically, using a dilatometric method combined with a high‐vacuum technique to exclude adventitious water and oxygen. Both in bulk and in methylene chloride solution, the reaction is not stereospecific in the a…
Recent observations of the growth of quenched-in dislocation loops during annealing are discussed. A mechanism for the coalescence of loops is proposed. The mechanism depends on short-circuit diffusion around the periphery of prismatic dislocation loops. This mechanism is contrasted with the theory of loop coalescence…
In a previous paper, an attempt was made to reduce the theoretical coercive force by assuming that the magnetocrystalline anisotropy constant vanished in a certain region. A modification of this assumption was made in the present work, namely, the magnetocrystalline anisotropy was taken as zero in a part of the "imper…
Electron microscope studies of the tracks produced by fission fragments in thin films of UO2 have established a 100% detection efficiency for fission events in films 100 A or less in thickness. A background texture decreases the efficiency in thicker films. The tracks register in the films primarily as a result of a r…
Abstract The solid state polymerization of acrylamide and related monomers has been studied using the tools of electron spin resonance and optical microscopy. The data indicate that the reaction involves free radicals which do not terminate in the usual fashion. The reaction apparently involves a nucleation mechanism…