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The Scintillation Process in Plastic Solid Solutions
The scintillation process has been studied in a number of systems involving a solid solution of an organic fluor in polystyrene or polyvinyltoluene. It has been determined that direct excitation of the solute by the ionizing radiation contributes a negligible amount to the observed scintillation for the concentrations…
Phase Transitions in Antiferroelectric PbHfO3
Phase transitions in ceramic PbHf${\mathrm{O}}_{3}$ have been studied by dielectric and structural measurements. The dielectric constant is about 90 at room temperature, and its temperature dependence shows a small anomaly at 163\ifmmode^\circ\else\textdegree\fi{}C and a pronounced peak of 540 at 215\ifmmode^\circ\els…
Theory of Complex Spectra
A method for the calculation of the energy levels of an atom in terms of the experimentally observed energy levels of ions of higher ionization is developed. This method can be applied to a system of nonequivalent electrons, as well as equivalent electrons. The notion of fractional parentage is extended to systems of…
Electrical Properties of Titanium Dioxide Semiconductors
Measurements have been made of the electrical resistivity and Hall coefficient of semiconducting rutile both in the form of ceramics and single crystals from -190\ifmmode^\circ\else\textdegree\fi{}C to +500\ifmmode^\circ\else\textdegree\fi{}C. The samples were reduced in pure hydrogen for various times and temperature…
Quantitative Insolubility of Thorium Oxalate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Insolubility of Thorium OxalateH. L. Kall and Louis GordonCite this: Anal. Chem. 1953, 25, 8, 1256–1258Publication Date (Print):August 1, 1953Publication History Published online1 May 2002Published inissue 1 August 1953https://pubs.acs.org/doi/10.1021/ac60080a03…
GLASS FOR PHARMACEUTICAL PURPOSES
Journal Article GLASS FOR PHARMACEUTICAL PURPOSES Get access Violet Dimbleby Violet Dimbleby Department of Glass Technology, University of Sheffield Search for other works by this author on: Oxford Academic Google Scholar Journal of Pharmacy and Pharmacology, Volume 5, Issue 1, August-September 1953, Pages 969–989, ht…
Current Density Tables for Field Emission Theory
The Fowler-Nordheim field emission equation permits calculation of current density $J$ as a function of surface electric field $F$ and work function $\ensuremath{\varphi}$. Computed values of $J$ for $1.00\ifmmode\times\else\texttimes\fi{}{10}^{7}<F<1.00\ifmmode\times\else\texttimes\fi{}{10}^{8}$ v/cm and for $2…
Optical Investigations of Impurity Levels in Silicon
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical Investigations of Impurity Levels in SiliconE. Burstein, E. E. Bell, J. W. Davisson, and M. LaxCite this: J. Phys. Chem. 1953, 57, 8, 849–852Publication Date (Print):August 1, 1953Publication History Published online1 May 2002Published inissue 1 August 1953https://pu…
Second approximation calculations of mechanical and electrical relaxation and retardation distributions
Abstract Second approximation methods for calculating distribution functions of mechanical relaxation times from complex dynamic data have been improved so that calculations of adequate accuracy can be made over a wider range of variables than was previously possible. Analogous methods for calculating distribution fun…
Low Temperature Heat Capacities of Inorganic Solids. XVIII. Heat Capacity of Ammonium Chromium Alum1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow Temperature Heat Capacities of Inorganic Solids. XVIII. Heat Capacity of Ammonium Chromium Alum1Herrick L. Johnston, Jih-Heng Hu, and William S. HortonCite this: J. Am. Chem. Soc. 1953, 75, 16, 3922–3924Publication Date (Print):August 1, 1953Publication History Published…
Preparation and Viscosity of Chitosans
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The Surface Tension of Liquid Silicon and Germanium
The surface tensions of liquid silicon and germanium were determined using the drop weight method. 600 dynes/cm was found for germanium and 720 dynes/cm for silicon at their freezing points and argon atmosphere. The parachors of the group IVb elements as derived from surface tension measurements of the molten elements…
Effect of Nickel and Copper Impurities on the Recombination of Holes and Electrons in Germanium
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Nickel and Copper Impurities on the Recombination of Holes and Electrons in GermaniumJ. A. Burton, G. W. Hull, F. J. Morin, and J. C. SeveriensCite this: J. Phys. Chem. 1953, 57, 8, 853–859Publication Date (Print):August 1, 1953Publication History Published online1…