Materials Literature
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The tl:erma.l properties of polytetra~~oro e thyl ene (Teflon ) . samples were investigated, uStng an ad l abatJc~vacuum calonmeter. Ihe effect of the annealll1g and quenchtng processes on the heat capacity of a mold ed T eflon sample was studied. The heat-capacity data were used to compute the heat capacity, enthalpy…
Recent experiments have demonstrated the feasibility of observing nuclear electric quadrupole interactions of widely varying magnitudes in solids. While these effects can often be observed in powdered samples, the most complete information is obtainable from the Zeeman pattern of a single crystal. To facilitate interp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 61. dl-Mandelic AcidH. A. RoseCite this: Anal. Chem. 1952, 24, 10, 1680–1681Publication Date (Print):October 1, 1952Publication History Published online1 May 2002Published inissue 1 October 1952https://pubs.acs.org/doi/10.1021/ac60070a065https://doi.or…
The projection and transmission methods of diffraction image formation with electrons are discussed in relation to their practical application.The significance of the two methods as limiting cases of one general method is shown. Analysis shows that the projection method is limited in a practical sense by the combinati…
Extractamos en las páginas que siguen algunas notas recientes sobre la fabricación de áridos ligeros para hormigón, a base de pizarras y escorias esponjadas, vermiculita, etc. También se indican, creemos que, por vez primera en idioma español, algunas particularidades relativas a la fabricación del material ligero de…
Especialmente enviado para Útimos Avances, desde Venezuela, tenemos el gusto de presentar el trabajo del Sr. Capella Canals, en el que se muestra el diseño de un aparato sencillo para medidas de permeabilidad en polvo de cemento, es decir, para determinaciones de superficie específica. Dada la dificultad de lograr en…
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The crystal structure of NaZn_(13) and of several homologous compounds AB_(13) was reported by Ketelaar and by Zintl & Hauke to be based on space group O_h^6-Fm3c, with 8 :Na in 8(a): ¼, ¼:, ¼; ... ; 8 Zn_I in 8(b): 0, 0, 0; .... ; and 96 Zn_(II) in 96(i): 0, y, z; ... . Approximate values were reported for the pa…
The formulae are given for the Fourier transforms of a number of helical structures; namely, a thin helical wire, a set of identical atoms spaced at regular intervals on a helix, and the general case of a group of atoms repeated by the operation of a non-integer screw. General predictions are made concerning the inten…
Abstract The minerals in acid-insoluble residues, 2 microns and less in diameter, from 27 limestones and dolomites, ranging in age from Cambrian to Recent, both marine and non-marine in origin were determined qualitatively. Quartz is widespread and abundant. Illite is the dominant clay mineral in both marine and non-m…
Hydrous micas differ from normal micas in that they contain less potassium and more water. In the calculation of structural formulae from their chemical analyses, two methods have been used which rely on the following different assumptions: 1. As these minerals are often fine-grained and may contain adsorbed water, no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Extent of the Photochemical Reduction of Phosphotungstic AcidLyman ChalkleyCite this: J. Phys. Chem. 1952, 56, 9, 1084–1086Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https://pubs.acs.org/doi/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer Chemistry of the Linear SiloxanesE. L. Warrick, M. J. Hunter, and A. J. BarryCite this: Ind. Eng. Chem. 1952, 44, 9, 2196–2202Publication Date (Print):September 1, 1952Publication History Published online1 May 2002Published inissue 1 September 1952https://pubs.acs.or…
A new theory of metal transfer and wear is suggested in this paper. The essence of the theory is as follows: Metal transfer and wear take place at points of actual contact. The interfaces of the high spots that actually make contact are roughened as the result of plastic deformation when they carry normal load. The me…
For a ferromagnetic specimen exhibiting magnetic viscosity, the intensity of magnetization increases continuously with time under steady external field conditions An account is given here of investigations to determine the influence on magnetic viscosity of changes in the magnetic field applied to the specimen, two ca…
Alamosite was first described by Palachc and Merwin, i who thought it might be isomorphous with wollastolfite. For that reason it has been re-examined, using X-ray methods. A specimen from the original locality at Alamos, Sonora, Mexico (B.M. 1910,330) was made available through the courtesy of the British Museum (Nat…