Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
No disponible
No disponible
No disponible
No disponible
No disponible
No disponible
No disponible
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…