Materials Literature
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Die Gitterkonstanten der Erdalkalisulfide wurden nach der asymmetrischen Methode für Pulveraufnahmen bestimmt. Die Eignung der verwendeten Kamera für Präzisionsmessungen ergab sich aus der Bestimmung der Gitterkonstanten von reinstem Gold. Die Messungen hatten folgendes Ergebnis: MgS : a = 5,1929 ± 0,0003 kX CaS : a =…
Abstract Unusual orientation effects encountered during the formation of filaments of polyamides (nylon 6,6, 6,10, and 6 (polyhexamethylene adipamide, sebacamide, and polycaproamide)), polythene, and Terylene (polyethylene terephthalate) are described and discussed. The paper is divided into two parts: (I) extrusion,…
The stability relations between the hexagonal and rhombohedral graphite modification have been investigated using predominantly “single crystals”. Neglecting small amounts of stacking disorder natural graphite crystals have been found to consist usually of the pure hexagonal modification. However, several examples wer…
Barium ferrite (BaO:6Fe2O3) has been investigated magnetically to test the predictions of fine particle theory in the region of grain sizes larger than the critical one for which no satisfactory theory exists as yet. Grain size and coercive force of polycrystalline magnets (nonoriented and crystal oriented) were close…
The ordered arrangements of the defects of iron atoms in FeSe x have been studied for several compositions by X-ray analysis. These defects tend to assume an ordered arrangement as in the case of pyrrhotite FeS 1.14 . New phases are found in the region ( x =8/7∼4/3) which have been considered as the single phase regio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of Gelation of Gelatin. Influence of Certain Electrolytes on the Melting Points of Gels of Gelatin and Chemically Modified Gelatins.Jake Bello, Helene C. A. Riese, and Jerome R. VinogradCite this: J. Phys. Chem. 1956, 60, 9, 1299–1306Publication Date (Print):Septem…
A combination of Knudsen effusion and mass spectrometric techniques have been employed in studying the species existing in the vapor in thermodynamic equilibrium with a condensed mixture of boron and boric oxide in the temperature range 1300°K to 1500°K. Positive ions were produced by electron bombardment of vapor eff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Native and Denatured States of Soluble CollagenHelga Boedtker and Paul DotyCite this: J. Am. Chem. Soc. 1956, 78, 17, 4267–4280Publication Date (Print):September 1, 1956Publication History Published online1 May 2002Published inissue 1 September 1956https://pubs.acs.org/d…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Abstract The internal structure of various types of filter media and the nature of fluid flow through them are examined. Methods of characterizing the internal pore structure of filter media are reviewed, and the permeability, bubble‐pressure, and mercury‐intrusion methods are applied to ten typical media, with result…
A survey of the corrosion chemical behavior of unalloyed Ti is given. The protective coating arising in various media was detected by electron diffraction diagrams, and the mechanism of the formation and dissolution of the protective layer is discussed. The voltage-time pattern of activated titanium in aqueous solutio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly Salts Containing Cobalt and Hexavalent Tungsten in the Anion1Louis C. W. Baker and Thomas P. McCutcheonCite this: J. Am. Chem. Soc. 1956, 78, 18, 4503–4510Publication Date (Print):September 1, 1956Publication History Published online1 May 2002Published inissue 1 S…
The possible configurations adopted by woven cloth when fitted to various surfaces are discussed in this paper. A general type of fitting (involving two parameters) to surfaces of revolution is given together with some photographic illustrations. The differential equations of fitting to any surface are derived and it…
ELECTRON microscopic studies of metals thinned by electrolytic polishing and other means to a degree that they become transparent for electrons, were started by Heidenreich1 and continued by Castai...
Abstract The results of a study of x‐ray diffraction, birefringence, and infrared dichroism on a series of polyethylene samples elongated between 0 and 400% are presented. It is shown that, by using any two of the three methods together, one may determine individually the orientation of the amorphous and crystalline p…
Se pasa revista a los distintos tipos de ataques que puede sufrir el hormigón, así como a las sustancias que lo llevan a cabo, indicándose las causas tal como se aceptan hoy en día por la mayoría de los investigadores. Se analizan a continuación, los distintos procedimientos empleados para lograr la protección del hor…
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