Materials Literature
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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.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential Thermal Analysis of Inorganic CompoundsSaul Gordon and Clement CampbellCite this: Anal. Chem. 1955, 27, 7, 1102–1109Publication Date (Print):July 1, 1955Publication History Published online1 May 2002Published inissue 1 July 1955https://pubs.acs.org/doi/10.1021/a…
J. K. Galt has recently suggested a mechanism for the losses observed in ferromagnetic resonance and domain wall motion in single crystals of nickel ferrite containing small amounts of divalent iron substituted for divalent nickel. Each such substitution provides one electron able to move between the various octahedra…
Abstract The orientation of the crystallites in spherulites was investigated by using special microbeam x‐ray techniques. The materials studied were: polyhexamethylene adipamide and sebacamide, polyethylene, and polyethylene terephthalate. In all these substances the c axes (molecular chains) were perpendicular to the…
A series of monodisperse polystyrene latexes has been prepared by carefully controlled emulsion polymerizations. The particle diameters of three of these latexes were determined by electron microscopy. The latex particles were dispersed on collodion membranes supported by copper grids. The microscopes had previously b…
An accurate photometric method has been developed using a Pfalz and Bauer Fluorophotometer for measuring the lysis of suspensions of M. lysodiekticus by lysozyme. This method has the distinct advantages of reproducing activities in 60 seconds after addition of the enzyme. Measurement of maximal rate of lysis in the ea…
High‐purity calcite of 10/20 mesh was calcined at various heating rates and fired to various maximum temperatures to determine the effect of these variables on the densification of the CaO produced. It was found that the heating rate during dissociation had a great bearing on densification. Shock heating conditions at…
Abstract The equilibrium curve between graphite and diamond is calculated up to 1200°K by making use of some new experimental data. The justification for extrapolating the values to higher temperatures is given. The equilibrium pressures below 1200° are shown in a table, while above 1200°K the curve can be represented…
Theoretical relationships and experimental data concerning thermal conductivity for a number of oxide materials have been compared over a wide temperature range. Deviations from the basic proportionality between k and 1/ T are caused by radiant‐energy transmission, a high Debye temperature, a low mean free path of the…
Se describen diferentes aparatos que permiten medir la consistencia de la pasta y del mortero de yeso. Se indican los resultados de algunos ensayos comparativos.