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Experimental measurements on nuclear quadrupole resonances of chlorine and antimony isotopes in solids have been made to an accuracy of about 0.001 percent. The results are compared in detail with theoretical results for (1) nuclear quadrupole interaction, (2) interaction between quadrupole coupling and thermal vibrat…
Manganese bismuth loses its spontaneous magnetization very sharply at 633\ifmmode^\circ\else\textdegree\fi{}K. At the same temperature drastic changes occur in the lattice constants. Previous workers have interpreted both these phenomena as arising from a ferromagnetic-antiferromagnetic transition. The present work in…
A formula for the change in capacity due to the insertion of a yarn in a parallel-plate condenser, in fairly general circumstances, is given in this paper. The effects of various factors, such as yarn density, twist, dielectric constant, and geometrical configuration, are discussed at length.
Previous work has shown that the structural reversals of cotton fibers are points of weakness at which the fibers prefer to break. The present paper is concerned with the distribution of these reversals in the individual fibers and with differences in reversal frequencies for various cotton varieties. It is shown that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of HCN TetramerRichard L. Webb, S. Frank, and W. C. SchneiderCite this: J. Am. Chem. Soc. 1955, 77, 13, 3491–3493Publication Date (Print):July 1, 1955Publication History Published online1 May 2002Published inissue 1 July 1955https://pubs.acs.org/doi/10.1021/ja0…
Experimental results are reported of the magnetic properties of telluride of cobalt, CoTe x , where x is the molal content of tellurium. Measurments of the magnetization have been made over a range of temperatures between liquid air and 1150°C. The results of these measurements show that this compound, when stoichiome…
The tungsten surface in a field emission microscope is exposed to oxygen gas at a pressure near 5×10—8 mm and the effect of the gas on the field emission is observed. During the first 30 seconds, the emission decreases rapidly, but some regions deactivate more rapidly than others. During the next 12 minutes, the rate…
Infrared studies of HN3 and DN3 in the gas and solid phases and of HN3 in CCl4 solutions are presented. The two low-frequency skeletal bending modes are identified, permitting calculation of the thermodynamic properties of hydrazoic acid. Hydrogen bonding of HN3 and DN3 in the solid state is indicated by frequency shi…
Abstract A study was made of a Red‐Yellow Podzolic soil with particular regard to the properties of dioctahedral vermiculite, one of its major clay minerals. The soil, Nason silt loam, which is derived from a muscovite schist residuum, was found to be nearly devoid of exchangeable calcium and low in other bases. Altho…
A theoretical study has been made of the focusing of high-current electron beams by means of the aperture effect. The aperture effect is obtained by a triode electron optical system. An equation for describing the beam profile in the system has been described. Both the condition for obtaining the minimum radius of the…
Abstract It has been recognized for many years that many aspects of clay technology including soil treatment and drilling mud treatment must remain in an essentially empirical state until a basis for the understanding of ion exchange reactions is established. Much of the work on ion exchange reactions of clays in the…
Abstract Differential thermal analysis (DTA) began soon after the development of the thermocouple. It has progressed through the systematic development of better equipment and the cataloguing of typical DTA curves for a variety of materials until good technique now requires control of the composition and pressure of t…
A smooth, flat, rigid punch under increasing normal load presses against a half space of a perfectly plastic material which obeys Tresca’s yield criterion. An admissible velocity field is constructed for an arbitrary smooth punch hence, for any particular case, a limit design theorem of Drucker, Prager and Greenberg m…
Abstract Exposure to high energy radiation offers a means of producing controlled branching in long chain polymers. Branched silicone polymer molecules were obtained by exposing linear molecules to high energy radiation. The increase in weight‐average molecular weight calculated theoretically from the radiation dose w…
Abstract Since X-ray diffraction patterns are directly related to crystal structures. X-ray identification is, in principal, better suited to the recognition of structural groups and structural varieties than of chemical species. Well-formed kaolin, mica, and chlorite structures give rise to characteristic 7, 10 and 1…
Summary Solubilities of cottonseed, peanut, sesame, and soybean oils in aqueous alcoholic solutions at various temperatures were determined directly. Solubility curves for the four oils in aqueous alcoholic solutions are presented. The critical solution temperatures versus alcoholic concentrations data have been plott…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Amino Acid Composition of Bombyx mori Silk Fibroin and of Tussah Silk FibroinW. A. Schroeder, Lois M. Kay, Barry Lewis, and Nancy MungerCite this: J. Am. Chem. Soc. 1955, 77, 14, 3908–3913Publication Date (Print):July 1, 1955Publication History Published online1 May 2002…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Ernst Fischer, Max Frankel, Reuven Wolovsky; Wavelength Dependence of Photoisomerization Equilibr…
Quantitative measurements have been performed on some fundamental phenomena caused by ultrasonic cavitation, i.e., the synthesis of hydrogen peroxide, the oxidation of potassium iodide, the decomposition of carbon tetrachloride, the degassing action, and the evolution of heat in connection with the cavitation process.…
Relative growth rates of three freshwater plankton diatoms-Asterionella formosa, Fragilaria crotonensis, and Tabellaria flocculosa var. asterionelloides-are described from cultures suspended at various depths and during several seasons in the lake Windermere. Seasonal variation in rates recorded near the surface (i m.…