Materials Literature
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Phosphors of the ZnS-CdS type under an applied ac field exhibit capacity changes when illuminated. The measurements indicate that in some phosphors the change in capacity may not be attributed solely to a change in ohmic resistance. A possible explanation for the mechanism involved in these cases is given. Capacity de…
The relative resistance to mass transfer in liquid lead of 24 metals and alloys were measured. Tests were performed in small quartz thermal convection loops. The test temperature was about 800 C with a thermal gradient of 300 C existing across the loops. Of the metals and alloys studied, only columbium and molybdenum…
Abstract X-ray analyses of the clay minerals from thousands of sediments indicate that any of the major clay minerals can occur in abundance in any of the major depositional environments and there is no consistent coincidence between specific clay minerals and specific depositional environments. It is concluded that t…
The crystal structures of the following binary intermetallic compounds of plutonium are reported: PuAl 2 , PuAl 3 , PuAl 4 , PuBe 13 , PuCo 2 , PuFe 2 , PuMn 2 , PuNi 2 , PuNi 5 , and Pu 2 Ni 17 . In addition, the unit cell dimensions are reported for PuAg 3 .
A previous theory for the mobility of molecules in glasses near the glass temperature has been extended in an effort to deduce the semiempirical relation proposed by Williams, Landel, and Ferry. By focusing attention upon the free volume, one is able to derive their relation in a straightforward fashion subject to app…
The results of measurements on single crystals of KNb${\mathrm{O}}_{3}$ are reported. From the dielectric constant and spontaneous polarization measurements the coefficients of the first three terms of the free energy expressed as a power series in the polarization can be found. The detailed behavior of single domain…
Summary A theory of creep buckling is presented in which the instantaneous elastic and plastic deformations following the application of a load, as well as the steady creep deformations, are considered in an approximate manner. Equations are given from which the critical time, that is, the time elapsing between load a…
Abstract The use of glycerol retention measurements to calculate surface areas of clay minerals is described. Assuming that the glycerol retained on external surfaces is monomolecular in thickness, and that both this layer and the monomolecular glycerol layers adsorbed on internal surfaces of montmorillonite, vermicul…
Nickel ferrite, as ordinarily prepared, has a dc resistivity of 104 to 106 ohm-centimeters. It has been found that by incorporating small amounts of manganese or cobalt, the resistivities can be increased to 1010 or 1011 ohm-centimeters. Presumably, replacing Fe++ or Ni+++ with Mn or Co ions eliminates the easy conduc…
The scattering of phonons by electrons is calculated, assuming the usual electron–phonon interaction, for a parabolic band whose degeneracy temperature is comparable with the temperature of the lattice. The contribution to the thermal resistance is given by an exact formula, subject only to justifiable assumptions con…
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Fabricación y características de un nuevo tipo de bloque cavernosos, resistentes y de tabiquería de hormigón calcáreo.
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Se realiza un estudio de los conocimientos actuales sobre el problema de la heladicidad de los materiales de construcción. Se presentan los resultados de los ensayos realizados en los últimos años y se ofrece una posible teoría de la acción del hielo sobre los productos cerámicos. Finalmente, se indican las conclusion…
Mediante la ventilación de los secaderos de estanterías se consigue conservar, en verano, el bajo precio del secado natural, y obtener, en invierno un precio comparable al del secado artificial.
El efecto nocivo de la mica depende tanto de la cantidad como del tamaño de las laminillas. Para fracciones gruesas, una adición de un 1% disminuye ya la resistencia del mortero; para la fracción más fina una adicción del 3% no actúa desfavorablemente, pero si una adición de 5%.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion and Heat Exchange in Chemical Kinetics.O. A. HougenCite this: J. Am. Chem. Soc. 1956, 78, 4, 885–886Publication Date (Print):February 1, 1956Publication History Published online1 May 2002Published inissue 1 February 1956https://pubs.acs.org/doi/10.1021/ja01585a059h…