Materials Literature
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Simple expressions are derived for the range and straggling of individual electrons. Large energy losses due to bremsstrahlung make the average range smaller than would be calculated from the average energy loss. Effects of multiple scattering are included. The results are in good agreement with numerical calculations…
In amorphous and hexagonal selenium optical absorption and photoconductivity were studied in their dependence on temperature. The absorption edge shifts for amorphous selenium toward shorter wavelengths with decreasing temperature. For a temperature change from 300° to 90°K and a layer thickness of 98μ, for example, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Persulfate-Iron(II) Initiator System for Free Radical Polymerizations1J. W. L. Fordham and H. Leverne WilliamsCite this: J. Am. Chem. Soc. 1951, 73, 10, 4855–4859Publication Date (Print):October 1, 1951Publication History Published online1 May 2002Published inissue 1 Oct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyelectrolyte Behavior of Polyamides. I. Viscosities of Solutions of Linear Polyamides in Formic Acid and in Sulfuric Acid1John R. Schaefgen and Charles F. TrivisonnoCite this: J. Am. Chem. Soc. 1951, 73, 10, 4580–4585Publication Date (Print):October 1, 1951Publication His…
This paper is a study of the geometry of fabric interstices as related to air flow through cloth structures. It assumes that textile yarns act as flexible, inextensible, circular cylinders. Modes of thread interlacing are classified, and minimum horizontal pore areas for each type of intermesh are calculated. Minimum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of the Hydrides of Zinc, Cadmium, Beryllium, Magnesium and Lithium by the Use of Lithium Aluminum Hydride1Glenn D. Barbaras, Clyde Dillard, A. E. Finholt, Thomas Wartik, K. E. Wilzbach, and H. I. SchlesingerCite this: J. Am. Chem. Soc. 1951, 73, 10, 4585–4590…
Se demuestra (Que la, cal libre en los gránulos de Clinker no está homogéneamente distribuida sino que abunda más en las zonas internas de los gránulos que en las exteriores, aumentando de fuera a dentro según una dirección radial, de forma posiblemente continua. A base de los datos que se exponen, se hacen considerac…
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Summary The phenomenological theory of barium titanate given in an earlier paper has been extended, and expressions obtained for the piezoelectric constants, elastic coefficients for constant field and dielectric constants for constant strain in terms of other physical constants of the material. Curves are drawn showi…
Abstract This paper describes an experimental study of the frictional behaviour of diamond, graphite and of carbon which have been outgassed in vacuo. The removal of surface films which are normally present causes a large increase in the friction. The admission of a small amount of oxygen, water vapour or other contam…
Abstract Durch präparative Arbeiten der letzten Jahrzehnte ist bei verschiedenen Elementen das Auftreten von Oxydationsstufen festgestellt worden, die man bisher nicht kannte oder zum mindesten nicht beachtet hatte. Es wird über die wichtigsten Ergebnisse für die Elemente Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, Alkali‐…
Abstract Nach einer Besprechung der apparativen und theoretischen Grundlagen der Ultrarotspektroskopie wird an Hand einiger Beispiele aus der organischen Chemie die Anwendungsmöglichkeit in der qualitativen und quantitativen Analyse erläutert.
The spontaneous magnetostriction of iron-silicon alloys can be adequately described by two constants ${h}_{1}$ and ${h}_{2}$. For ordered alloys ${h}_{1}$ goes through zero at about 11 atomic percent silicon, ${h}_{2}$ at about 9 atomic percent silicon. In disordered alloys, in the composition range around 10 percent…
Abstract The magnetic moments of thin superconducting films of tin, lead and indium, obtained by evaporation of the metal in vacuo, have been measured by a ballistic method. Values of the penetration depth, λ0, at absolute zero, derived from them by extrapolation, are estimated as 5.0 ± 0.1 x 10-6 cm. for tin, 3.9 ± 0…
A thermal analysis of the system PbBr2–PbO proved the existence of four compounds intermediate between PbBr2 and PbO, namely PbBr2·PbO, PbBr2·2PbO, PbBr2·3PbO, and PbBr2·7PbO. The compound PbBr2·PbO was unstable above 497°C whereas the others were stable at their melting points. Pure PbBr2·PbO·H2O (or Pb(OH)Br) was pr…
Dicyclohexylammonium nitrite is a powerful inhibitor for corrosion of steel by fresh water. Since this nitrite salt is slightly volatile, it has commercial application in a new method for preventing corrosion of packaged steel articles by the moisture that enters or is present within a package. It functions by vaporiz…
Refu le 9 fgvrier 1951
The existence of an allotropic transformation in hafnium, suggested by Zwikker in 1926, has been confirmed. The transformation temperature is 1310±10°C. The high temperature beta-form is probably body-centered cubic.
Measurements have been made of the refractive index of amorphous selenium in the red and near infra-red spectral region. The absorption coefficient of amorphous selenium has been measured in the ultra-violet, visible and near infra-red spectral regions. The transmission coefficients of several single crystals of selen…
This paper examines the relationship of structural geometry to the abrasion-resistance of textile fabrics. It is pointed out that the durability of a fabric can be significantly altered by modifying its structural design, without change in the fiber used in its manufacture. Earlier textile studies and heretofore unpub…