Materials Literature
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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…
The topography of unmoditied cotton fibers has been examined microscopically by means of surface replica techniques. The outstanding characteristic of the surface is a system of roughly parallel ridges and grooves spiraling around the fiber at an acute angle (usually 20 30 ) to its axis. The pattern of the surface is…
The magnetic susceptibilities of various Fe-Ni alloys have been measured through their melting points up to 1600°C. The susceptibilities of the alloys with less than 60 % Ni increase discontinuously on melting, while those of the alloys with more than 60 % Ni decrease. The temperature variation of the susceptibilities…
The factors which influence the properties of dielectric films formed by thermal evaporation are discussed. Detailed results are given for several materials which are of practical importance. The results obtained for the refractive index of transparent films (a) by the Brewster angle method and (b) by the measurement…
Abstract The temperature‐dependence of specific volume, rigidity modulus, and mechanical losses of plasticized and unplasticized cellulose acetates in the temperature range −100 to +200°C. has been studied. Two cellulose acetates, a triacetate and a cellulose (2.2) acetate were used, these being plasticized with varyi…
Abstract Für ausgewählte, möglichst symmetrische Moleküle mit einer Carbonyl‐bzw. Thiocarbonylgruppe im Fünfring werden die Eigenschwingungen zugeordnet. Es wird weiterhin der Einfluß von Nachbaratomen und, durch Vergleich mit offenkettigen Verbindungen, die Wirkung der Ringspannung auf die CO‐bzw. CS‐Valenzschwingu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Heat Contents of Calcium OrthosilicateJ. P. Coughlin and C. J. O'BrienCite this: J. Phys. Chem. 1957, 61, 6, 767–769Publication Date (Print):June 1, 1957Publication History Published online1 May 2002Published inissue 1 June 1957https://pubs.acs.org/doi/10.10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPraseodymium Oxides. IV. A Study of the Region PrO1.83-PrO2.001C. L. Sieglaff and L. EyringCite this: J. Am. Chem. Soc. 1957, 79, 12, 3024–3026Publication Date (Print):June 1, 1957Publication History Published online1 May 2002Published inissue 1 June 1957https://pubs.acs.org…