Materials Literature
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The primary mode of degradation of polybenzyl at elevated temperatures in the presence of air has been found to be an oxidative attack on the methylene bridge. Initially the methylene bridge is oxidized to keto and hydroxyl groups. Later substantial amounts of acid anhydride and/or ester are formed. Extensive oxidatio…
Clay minerals were collected from shales and clay deposits in New England and Eastern Canada ranging in age from Precambrian to Recent. The collection was made to include representative clay minerals of each district, geological period, and environment. Fifty-six samples were selected for detailed petrographic and X-r…
48Ti, 51Vの(α, n)反応の断面積をEα=31 MeVまでStacked foil法を使った放射化法で測った。これらの反応は51Crおよび54Mnの無担体放射性同位元素の製造に対しても考慮さるべき経路の1つであろう。照射には核研160cmサイクロトロンを使用し,ビームの強さはファラデー・カップを用いて測った。Ti-ターゲットとしては約1.8mg/cm2の金属箔を, V-ターゲットとしてはAl箔の上にV2O5を少量のクリヤー・ラッカーと共に吹きつけたものを用いた。照射後短寿命放射能を崩壊させてのち, 51Crの325keV-γ線, 54Mnの840keV-γ線を1 3/4;×2in.の井戸型シンチレータで測定した。放射能の…
The properties of the field emission electron source are discussed. These include high current density, small size, no heater, instantaneous response, and a highly non-linear current-voltage relationship. Engineering data are then derived including conductance, perveance, beam power, etc. It is shown that the field em…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVAPOR PRESSURES OF FeCl2, FeBr2 AND FeI2 BY THE TORSION EFFUSION METHODR. J. Sime and N. W. GregoryCite this: J. Phys. Chem. 1960, 64, 1, 86–89Publication Date (Print):January 1, 1960Publication History Published online1 May 2002Published inissue 1 January 1960https://doi.or…
Electron microscopy of fractured and polished surfaces of commercial silicate glasses by the preshadowed carbon replica technique reveals the presence of inhomogeneities in the glass ranging in size from 30 to 150 a.u. in diameter. Experiments were carried out to prove that the observed features resulted neither from…
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This is the first of a series of papers concerned with the general problem of thermal degradation and oxidation of polymers. Part I consists of a description of the technique used and the results obtained on butylated melamineformaldehyde and urea-formaldehyde resins. The course of the degradation and/or oxidation is…
A method for the precise measurement of surface tension and density of molten salts in one apparatus at temperatures up to 1000°C is reported. The essential features of the apparatus are a density bob of special design to enable surface tension data to be obtained simultaneously, and a continuously variable height cru…
Daily measurements of fallout air activity and deposited activity at Kjeller, Norway, from I Sept. 1956 to 30 Sept. 1959 are given as monthly means for days with and without obvious precipitation. It seems that significant concentrations of fallout particles reach the earth about 3 months after high-yield test explosi…
A brief survey was presented of the experimental data on the distributions of the neutron widths of nuclear finestructure levels and of the nearest-neighbor spacings for both atomic and nuclear energy levels. Random- matrix mcdels to predict these data were discussed both analytically (in all possible cases) and via M…
J. S. Griffith, Trans. Faraday Soc., 1960, 56, 193 DOI: 10.1039/TF9605600193
Abstract not Available.
A precision determination of the displacement parameter of zone-refined bismuth containing less than 0�3 parts per million of spectroscopically detectable impurity has been carried out as a function of temperature. Procedures were used that minimize uncertainties in integrated intensities due to extinction, absorption…
Yttrium metal was prepared by the reduction of YF 3 with calcium forming a low melting Y‐Mg intermediate alloy. Magnesium was removed by sublimation to produce yttrium metal sponge. A method is described for removing oxygen and fluorine from the alloy by extraction with fused yttrium salts. The results of electron bea…
L. E. Lyons, J. R. Walsh and J. W. White, J. Chem. Soc., 1960, 167 DOI: 10.1039/JR9600000167
Studies on the constitution of silicate melts are very important not only in the fields of metallurgical processing or the glass industry, but also in dealing with the properties or constitution of liquids. For this reason a PbO-SiO2 system was chosen as a model of silicate or slag because of its low melting point and…
A simplified theory of the behavior of suspended polymer particles in a real liquid dielectric is presented. It is becoming well known that nonuniform fields exert an attractive force of interesting magnitude on particles of high dielectric constant suspended in a liquid medium of lower dielectric constant. In a real…
Nous avons étudié les sections efficaces des réactions (p, xn) pour la formation des isotopes du mercure, de masse comprise entre 197 et 188, séparés par déviation magnétique. Nous avons identifié, mesuré les périodes et l'énergie des principales raies γ des 190Hg, 189Hg, 188Hg et de leurs descendants.
S. M. Iqbal and L. N. Owen, J. Chem. Soc., 1960, 1030 DOI: 10.1039/JR9600001030