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Mass spectrometric study of the gaseous species effusing from a Knudsen cell filled with WO3 has shown that WO3(s) sublimes to form the gaseous molecules W3O9, W4O12, and W5O15. From the measured partial pressures for these species and their variations with temperature, ΔH, ΔF0, and ΔS0 of sublimation are obtained.
A technique similar to that used in crystal counter experiments is applied to the study of transit times of electrons and holes in thin evaporated films of amorphous Se carrying Au electrodes. Electron-hole pairs are generated near the top electrode by short electron pulses (or light flashes) of 10 -7 sec duration. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPOLYNUCLEOTIDES. I. MOLECULAR PROPERTIES AND CONFIGURATIONS OF POLYRIBOADENYLIC ACID IN SOLUTION1Jacques R. Fresco and Paul DotyCite this: J. Am. Chem. Soc. 1957, 79, 14, 3928–3929Publication Date (Print):July 1, 1957Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PROPERTIES OF AN ADENINE RIBONUCLEOTIDE PRODUCED WITH CELLULAR PARTICLES, ATP, Mg++, AND EPINEPHRINE OR GLUCAGONEarl W. Sutherland and T. W. RallCite this: J. Am. Chem. Soc. 1957, 79, 13, 3608Publication Date (Print):July 1, 1957Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Studies on the Thermal Decomposition of t-Butyl Hydroperoxide in Dodecane SolutionB. Kathleen MorseCite this: J. Am. Chem. Soc. 1957, 79, 13, 3375–3380Publication Date (Print):July 1, 1957Publication History Published online1 May 2002Published inissue 1 July 1957http…
Abstract The Flory-Rehner theory of swelling allows an estimate of the number of crosslinks in gum vulcanizates. In reinforced rubbers the apparent degree of crosslinking is raised by some fillers, particularly carbon blacks. It has been shown experimentally that, for vulcanizates of a given polymer at a fixed filler…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat of Sublimation of Boron and the Gaseous Species of the Boron–Boric Oxide SystemAlan W. Searcy and Clifford E. MyersCite this: J. Phys. Chem. 1957, 61, 7, 957–960Publication Date (Print):July 1, 1957Publication History Published online1 May 2002Published inissue 1 Ju…
Abstract Modulus and swelling measurements were made on silicone rubber samples compounded with five different fillers. The data were at variance with the predictions of the theory of modulus reinforcement by Weiss, Rehner, Smallwood, and Guth. The results, when analyzed using a modification of the kinetic theory of e…
An x-ray analysis of tellurium oxide glass has been made. This glass is unusual in that it is made up of octahedra which exhibit a close order configuration such that four oxygens are found at a distance of 1.95 A and two others at 2.75 A. This configuration is similar to that found in the crystal. The way in which th…
Oxidation of UO2 to U3O8 in dry air and oxygen at temperatures of 160 to 350°C proceeds by a two-step reaction. In the first step the tetragonal oxide of composition UO2.34±0.03 is formed. In the second step this tetragonal phase is converted to orthorhombic U3O8. The rate controlling process in the first stage is the…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Evelyn M. Vaskas, "Note on the Wasserman-Wolf Method for Designing Aspheric Surfaces," J. Opt. Soc. Am. 47, 669-670 (1957) Export Citation BibTex Endno…
Abstract Infrared absorption spectra of oriented cellulose fibers have been observed using polarized radiation. Natural fibers are in general too thick but swelling them in NaOH solution followed by pressing, washing, and drying is an effective way of obtaining a suitable thickness in the 650–3100 cm. −1 region. The d…
By B. D. Cullity London : Academic Books Ltd. Reading, Mass : Addison-Wesley Publishing Co. Inc. Pp. 514 + xiv. Price 80s. The purpose of this book is to teach the reader with no previous experience the elements of X-ray diffraction theory, techniques and applications. The method of teaching this subject undoubtedly d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Spectrophotometric Procedure for Analysis of Cellulose and Modified CelluloseR. T. O'Connor, E. F. DuPre, and E. R. McCallCite this: Anal. Chem. 1957, 29, 7, 998–1005Publication Date (Print):June 21, 1957Publication History Published online1 May 2002Published inissu…
The implications of the Jahn-Teller theorem are discussed with special reference to the case where the forces tending to lower the symmetry of electronically degenerate molecular states are of the same order as the restoring forces encountered during typical vibrations. It is shown that the resulting dynamical situati…
The values of the elastic constants of LiF at 4.2\ifmmode^\circ\else\textdegree\fi{}K are found to be ${c}_{11}=12.46\ifmmode\times\else\texttimes\fi{}{10}^{11}$, ${c}_{44}=6.49\ifmmode\times\else\texttimes\fi{}{10}^{11}$, and ${c}_{12}=4.24\ifmmode\times\else\texttimes\fi{}{10}^{11}$ dynes/${\mathrm{cm}}^{2}$. At 300…
Abstract The addition of aluminium salts to gelatin solutions may give rise to considerable, though to some extent impermanent, viscosity increases. These effects are very dependent on pH. They also depend on the type of gelatin and on the concentration of the reactants. Similar effects are obtained when certain other…
Abstract Die Flächenregel der Korrosion ist zuerst im Jahr 1924 eindeutig formuliert worden und wird seitdem vor allem von Praktikern gern zur Abschätzung von Korrosionswirkungen benutzt. Sie hat allerdings keine Allgemeingültigkeit, sondern gilt unter ganz bestimmten Voraussetzungen. Diese Voraussetzungen lassen sich…
Th e t h er mal decomposit ion of polytetrafluoroeth ylene in t he presence o f gases or vapors h as bee n exp lored in t he range 450 0 to 500 0 C. Gases th a t have been used ca n be di vid ed into t hree groups, d ep ending on whether t hey inhibit, catalyze, or e xert no effect on the t herma l-deco mpos it ion pr…
Abstract Equilibrium isotherms are presented for the cation exchange of copper and sodium on Dowex‐50 resin in solutions from 0.01 to 4 N in chloride content, and the equilibrium data are correlated on the basis of the Donnan equilibrium. Data are also given on the water content of the resin and the diffusible ions pr…