Materials Literature
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Gerald W. Prescott, Arthur M. Scott, The Algal Flora of Southeastern United States. V. Additions to Our Knowledge of the Desmid Genus Micrasterias 2, Transactions of the American Microscopical Society, Vol. 71, No. 3 (Jul., 1952), pp. 229-252
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Decomposition of Sulfur Compounds. II. 1-PentanethiolC. J. Thompson, R. A. Meyer, and J. S. BallCite this: J. Am. Chem. Soc. 1952, 74, 13, 3287–3289Publication Date (Print):July 1, 1952Publication History Published online1 May 2002Published inissue 1 July 1952https:/…
Conclusions important to the practice of electron microscopy are drawn from experiments. Particles of Dow Latex 580G are unstable under electron beams and best micrographed at low intensity. Two different effects of radiation are noted. At low intensity the mean diameter in the present work was 2890A, the standard dev…
A morphological study of natural populations of Tabellaria in fresh water suggested that there were two fundamentally different types of growth (and therefore frustule structure) in the genus, and this has been confirmed by means of unialgal clone cultures. The existence of these different types of growth forms the ba…
In the course of investigation of the rectifying properties of silicon very interesting photoelectric properties were found. The first photo-cells were cut from hulk silicon in which a natural potential barrier was found. A typical spectral characteristic of such a cell is shown. This early work was followed by the di…
The Onsager and Kirkwood theories of polar liquids have been used to analyze the available experimental data on the pressure dependence of the dielectric constant. It is found necessary in most cases to assume an appreciable decrease in the dipole moment arising from intramolecular distortion which may be large enough…
It is shown on theoretical grounds that the electronegativity of oxygen in silicates depends upon the Si-0 structure as well as upon the Al/Si ratio in the (Si/Al)O₄ tetrahedra. The more Si-O-Si links in a silicate structure, the larger the electronegativity of the oxygen atoms attached to metallic ions. That is, the…
By assuming that the activation energy for flow in associated liquids is proportional to the inverse square of the absolute temperature, an empirical expression for the viscosity is obtained, which fits the data well. An empirical expression for the activation energy of mixtures of associated liquids is also proposed.
Abstract The theory of molecular distribution in condensation polymers has been extended to include systems of a rather general type. Equations for the distribution and the weight‐average molecular weight are given.
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En trabajos anteriores (1) que llevan el mismo título general que el presente, se fijaron las bases para el desarrollo y puesta punto de una nueva técnica para el estudio del fraguado y endurecimiento de los aglomerantes hidráulicos, fundada en la marcha de las curvas resistencia eléctrica – tiempo (R-t) de pastas cem…
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(1952). Mathematical theory of stationary dislocations. Advances in Physics: Vol. 1, No. 3, pp. 269-394.
The escape of radium salts from sealed containers has, in several instances, resulted in expenditure of from $50,000 to $100,000 by the institutions where such accidents occurred. These figures may seem exceedingly high. They include, however, the costs of decontamination, medical care, legal advice, lost production t…
Abstract Sorption, gas-phase diffusion in the region of molecular streaming, and surface diffusion in very dilute adsorbed films have been studied quantitatively for a number of gases in membranes of porous glass. The sorption of oxygen, nitrogen, argon, sulphur dioxide and ammonia near their liquefying temperatures r…
Abstract The thermionic constants of graphite are determined by finding by Knudsen’s effusion method the saturation vapour pressure of the electron gas in a graphite chamber, at different known temperatures, and applying the well-known Clapeyron-Clausius thermodynamic relation. The work function Φ of graphite determin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectrophotometric Determination of Titanium with Ascorbic AcidEdward Hines and D. F. BoltzCite this: Anal. Chem. 1952, 24, 6, 947–948Publication Date (Print):June 19, 1952Publication History Published online1 May 2002Published inissue 19 June 1952https://pubs.acs.org/doi/10…
Abstract The creep of three polycrystalline metals—commercial lead, pure lead and cadmium — has been investigated under conditions of simple shear, by a method in which a constant couple is applied to an annulus cut in a thicker disk of the metal. For comparison, normal tensile tests have been carried out on wires of…