Materials Literature
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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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The infrared spectra of polytetrafluoroethylene and polychlorotrifluoroethylene have been obtained between 4000 cm—1 and 70 cm—1. Polarization measurements on oriented samples were obtained in the region of 4000 cm—1 to 300 cm—1. It is known from x-ray diffraction studies that both polymers have helical chain configur…
Summary An experimental and theoretical study has been made in order to determine the number and the structure of the possible polymorphs and to determine the structural relations between them. The simplest structures are 1M, 2M 1 , 2M 2 , 3T, 20, and 6H polymorphs, and more complicated types can be developed. Some of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Theory of Liquids.Joseph O. HirschfelderCite this: J. Am. Chem. Soc. 1956, 78, 18, 4820Publication Date (Print):September 1, 1956Publication History Published online1 May 2002Published inissue 1 September 1956https://pubs.acs.org/doi/10.1021/ja01599a084https://doi.or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction Powder Patterns of Calcium PhosphatesA. O. McIntosh and W. L. JablonskiCite this: Anal. Chem. 1956, 28, 9, 1424–1427Publication Date (Print):August 21, 1956Publication History Published online1 May 2002Published inissue 21 August 1956https://pubs.acs.org/do…
The statistical thermodynamics underlying the distribution of cations over the tetrahedral and octahedral sites in ferrospinels is developed. The temperature dependence of the distribution law is analyzed by invoking the Debye approximation for the vibrational spectrum. The resultant equations permit the internal ener…
The dielectric, piezoelectric and elastic constants of polycrystalline ceramics at room temperature are calculated by averaging those values of single crystals on the assumption that the ceramic is composed of spherical crystallites. The calculated values are in good agreement with observed ones, showing that the piez…
The saturation magnetization as a function of quench temperature is measured for the ferrite system ${\mathrm{Mg}}_{y}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$. From these data the ionic distribution of Mg ions is evaluated and compared to the theoretical thermodynamic analysis developed in th…
A general review is made of the methods of manufacture and physical properties of the following types of stretch yarn:—crimped nylon, crinkle, stretch and Ban-Lon. A general description and definitions of the physical properties of fabrics knitted from these yarns are also given. The effect of knitting stiffness (expr…
Abstract Optical properties of ZnS: (Cu+Mn) phosphors have been extensively studies with the purpose to investigate the phenomena of sensitized luminescence in photoconductive phosphors. Spectra of emission, absorption and axcitation, thermoluminescence and photo-conductivity were measured. It was confirmed from the m…
Abstract On the hypothesis that “bound rubber” is a gel of carbon black particles, the bonding agent of which consists of the longer polymer molecules, a statistical theory is developed. The probability is first computed that a rubber molecule of i segments will be attached to j carbon black particles. By means of thi…