Materials Literature
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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
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE CHEMISTRY OF BORAZINE. III. B-SILYL BORAZINESA. H. Cowley, H. H. Sisler, and G. E. RyschkewitschCite this: J. Am. Chem. Soc. 1960, 82, 2, 501–502Publication Date (Print):January 1, 1960Publication History Published online1 May 2002Published inissue 1 January 1960https://…
Phase relations in the system Li 2 O–B 2 O 3 –SiO 2 were studied by quenching and solid‐state reactions. No ternary compounds were detected in the portion of the system containing less than 53% Li 2 O. Compatibility triangles were formed from the binary borate and silicate compounds. Liquidus data obtained by quenchin…
Zunyite, a rare aluminosilicate mineral of composition (OH, F)18Al13Si5O20Cl, has an unusual structure built up of Si5O16 groups of linked silicon tetrahedra and aluminium-oxygen groups of linked octahedra. The structure proposed by Pauling is verified and refined by X-ray methods, using 163 (hkO) reflections from sin…
Abstract Zusammenfassend wird über die Grundlagen der Oligomerenchemie und ihre Bedeutung für die makromolekulare Chemic berichtet, also über Synthese, Eingenschaften, Vorkommen und Isolierung aus Polykondensaten sowie das Verhalten unter Polymerisationsbedingungen; insbesondere an Hand von eigenen Arbeiten auf dem Ol…
D. J. Worsfold and S. Bywater, J. Chem. Soc., 1960, 5234 DOI: 10.1039/JR9600005234
About forty specimens of talc have been examined by X‐ray powder methods. Variations in the degree of crystallinity of the mineral have been observed, but no evidence has been obtained for polymorphic structural varieties. Single‐crystal data have confirmed the two‐layer mono‐clinic cell. Little evidence has been obta…
The data of Ryskin on diffusion of impurities into amorphous polymers appear to be consistent with the prediction of elastic continuum theory that the ratio of the entropy of activation, ΔS‡, to the enthalpy of activation, ΔH‡, is independent of the nature of the diffusing impurity. The ratio, ΔS‡/ΔH‡, depends only on…
An electrode potential study of the liquid aluminum‐silver system has been conducted with the cell in the temperature range 700°–980°C. The activities of both components, , , , and were determined for 700° and 900°C, and and for the temperature range of 700°–980°C. The activity curves are found to be similar in shape…
The surface degradation of both linear and crosslinked polymethylmethacrylate (PMM) has been studied over the surface temperature range of 550° to 910°K by means of a hot-plate pyrolysis technique. It was demonstrated that surface gasification due to the high heat flux at the decomposing PMM surface involves a depolym…