Materials Literature
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Granular inclusions, grain boundaries, lamellar precipitates, and the crystalline surface have been examined as possible nucleation centers for domains of reverse magnetization in ferromagnetic materials. It is concluded that the surface density of magnetic poles at the grain boundaries ${\ensuremath{\omega}}^{*}$ is…
Abstract A detailed analysis has been made of the course of crystallization in polyethylene terephthalate at different temperatures and from different preceding melt temperatures. The theoretical deductions based on the mechanisms surmised in part II and kinetical analysis of the density changes with time have been co…
Abstract An exploration has been made of the factors that affect the rates of crystallization of polyethylene terephthalate and the effect of the crystallization conditions on the crystalline state of the polymer. The rate and course of the crystallization is affected by molecular structural features such as molecular…
Abstract From the electrochemical theory of corrosion it follows that corrosion can be stopped by suppressing either the cathodic or the anodic reaction, or by inserting between the cathodic and anodic areas a large resistance, which impedes the movement of ions. Calculations indicate that paint films are so permeable…
SUMMARY: The life cycle of a Streptomyces sp. was studied by the Robinow HCl-Giemsa method of nuclear staining, and is described in the following manner: (1) initial nuclear division phase; (2) primary mycelium; (3) secondary mycelium (including aerial); (4) the formation of spores. It was observed that the method of…
The structure and kinetics of thermal decomposition of polytetrafluol'oethylene suggestcd sev eral m ethods for impro vemcnt of its stability: (a) p olym crization in the presen ce of fluor oca rbo ~l catalysts or ph<;>to?hemically to eliminate labile centers for initiation. (b) inclu-SlOn of foreIg n structural Ullit…
The voltage requirements for a modification of the spherical correction system of Seeliger (2) are given. The potential changes introduced by unintentional asymmetries of non-rotationallysymmetrical elements are calculated and an expression is given for the resulting aberrations. It is shown that some of these can be…
Abstract A study of pyro‐ and tripoly‐phosphates, by heterometric (photometric study of suspensions), pH and conductometric methods, was made on a quantitative basis. From the curves obtained, the composition and properties of the salts and complexes, which exist in solution or in the solid state, were deduced. All th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Nickel OxalateJ. A. Allen and D. E. ScaifeCite this: J. Phys. Chem. 1954, 58, 8, 667–671Publication Date (Print):August 1, 1954Publication History Published online1 May 2002Published inissue 1 August 1954https://pubs.acs.org/doi/10.1021/j150518a0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMaleic-Fumaric Isomerization in Unsaturated PolyestersS. S. Feuer, T. E. Bockstahler, C. A. Brown, and I. RosenthalCite this: Ind. Eng. Chem. 1954, 46, 8, 1643–1645Publication Date (Print):August 1, 1954Publication History Published online1 May 2002Published inissue 1 August…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlame-Resistant Polyesters from HexachlorocyclopentadieneP. Robitschek and C. Thomas BeanCite this: Ind. Eng. Chem. 1954, 46, 8, 1628–1632Publication Date (Print):August 1, 1954Publication History Published online1 May 2002Published inissue 1 August 1954https://doi.org/10.10…
The vapor pressures and the heat of vaporization of liquid uranium have been measured by collecting a known fraction of the vapor effusing from a Knudsen cell. The deposits were ``weighed'' by comparing the number of fissions upon thermal neutron irradiation with the fissions from a standard. The measured rate of vapo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Synthesis of Large Aluminum Phosphate CrystalsJoseph M. StanleyCite this: Ind. Eng. Chem. 1954, 46, 8, 1684–1689Publication Date (Print):August 1, 1954Publication History Published online1 May 2002Published inissue 1 August 1954https://pubs.acs.org/doi/10.1021/i…
The effect of heat‐treatment in the transformation range on the density of a borosilicate crown glass was studied by the method of quenched samples. An empirical equation is presented which satisfactorily represents the approach of the density to its equilibrium value at three temperatures. The density‐temperature rel…
Dislocations have a large effect on the electrical properties of germanium. Experiments show that dislocations act as acceptor centres. This paper discusses a simple model (due to W. Shockley) which identifies dislocation acceptors with the dangling unpaired electrons on the edge of the extra atomic plane of a disloca…
The nature of the permanent damage retained in metals from irradiation has been investigated in somewhat greater detail than has been done in the past. The usual assumption has been that the damage in all metals consists chiefly of interstitial-vacancy pairs. The model presented in this paper reduces to this picture f…
Forty-six standard x ray diffraction powder patterns are presented. Fourteen are to repiace twelve patterns already given in the x ray Powder Data File, and thirty-four are for substances not previously included. The patterns were made with a Geiger counter x ray diffractometer, using samples of high purity. The d-val…
The nucleation and growth of ferroelectric domains in barium titanate have been studied as a function of applied electric field and temperature. The optical and electrical measurements were made on thin single-crystal plates normal to $c$, the polar direction. When the electric field applied along this direction is re…
Relations between the elastic and plastic properties of pure polycrystalline metals are discussed and a systematic relation between shear modulus, Burgers vector and plastic shear strength of metals possessing the same lattice structure is proposed. In addition reasons are given for believing that in a limited tempera…
A review of the measured A1-O and Si-O distances leads to the values A1-O = 1.780.02 /~ and Si-O ----1-600.01 A. These values are of use in locating the positions of A1 and Si atoms in felspar or other structures by accurate measurements of distances in oxygen tetrahedra.