Materials Literature
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In the first part of this paper (1952, pp. 436-450), the structural states of the pure compounds KAlSi3O8 and NaAlSi3O8 have been discussed. This part considers the mixed-crystal series of these compounds and their unmixed states.
The mechanism for self-diffusion in single crystals of graphite has been examined theoretically. Calculations for vacancy and direct interchange mechanisms are based on atomic interactions within the graphite hexagonal layers. These interactions are obtained from the known systematic change of carbon-carbon bond stren…
An experimental study of the noise produced by a single cavitation bubble has been made. The noise consists principally of a transient pressure pulse associated with the collapse of the bubble. The motion of the bubble has been photographed simultaneously with the measurement of the pressure pulse.
Abstract A detailed study has been made of the scratches produced by a needle on natural rubber vulcanizates of different composition. The surface damage brought about in this way depends markedly on the nature of the rubber. In particular, the traces on unloaded vulcanizates are discontinuous whereas the traces on ca…
Permanent magnets in present use consist chiefly of alloys containing cobalt or nickel, or both. Because these elements are currently scarce, possible substitute materials were examined. The intermetallic compound manganese bismuthide was chosen for this investigation because it has the highest recorded magnetic cryst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpark Ignition. Effect of Molecular Structure.H. F. Calcote, C. A. Gregory, C. M. Barnett, and Ruth B. GilmerCite this: Ind. Eng. Chem. 1952, 44, 11, 2656–2662Publication Date (Print):November 1, 1952Publication History Published online1 May 2002Published inissue 1 November…
Various anomalous properties of borosilicate glasses are explained by the assumption that the atomic groups, each of which consists of one BO 4 tetrahedron with four BO 3 triangles bonded to it, are formed in these glasses. These atomic groups result from the reasonable postulate that BO 4 tetrahedra cannot be bonded…
Abstract It is evident that a copolymeric mixture, if sufficiently heterogeneous in chemical composition and molecular weight, may separate into two or more distinct phases. The conditions for thermodynamic stability of a single‐phase system have been investigated using the modified Flory‐Huggins equations for heterog…
According to Herpin’s theorem, a symmetrical thin-film combination is equivalent, at one wavelength, to a single film, characterized by an equivalent index and equivalent thickness. If a large number of identical nonabsorbing thin-film combinations are combined, the resulting periodically stratified medium acts as a b…
Die vorliegende Arbeit beschäftigt sich mit der Nachbildung der halbleitenden Elemente der vierten Hauptgruppe 1 des periodischen Systems (Diamant, Si, Ge, graues Sn) durch bisher nicht als Halbleiter bekannte Verbindungen von Elementen der dritten Hauptgruppe (Al, Ga, In) mit Elementen der fünften Hauptgruppe (P, As,…
Summary A theory of work-hardening is put forward ; the salient points are as follows. There are two types of hardening ; the normal rapid hardening of cubic metals and the slower hardening characteristic of hexagonal crystals and cubic metals under conditions of easy glide. A quantitative theory of the rapid hardenin…
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The present position of our knowledge of antiferromagnetism, including ferrimagnetism, is reviewed, and some very interesting phenomena concerning the magnetic behaviour of certain ferrites and of pyrrhotite are described and explained.
Abstract The paramagnetic resonance spectrum of copper acetate is anomalous in that it resembles that of an ion of spin 1, and its intensity decreases as the temperature is lowered. The latter is correlated with the decreasing susceptibility found by Guha (1951). The following hypotheses are suggested: (1) the crysta…
Abstract Nach einer Definition des Begriffes Dioxolan wird das Polymerisationsverhalten dieser Verbindungen, soweit sie durch eine oder mehrere, semicyclisch gebundene Doppelbindungen charakterisiert sind, besprochen. An Beispielen ein‐ und zweifach ungesättigter Vertreter wird gezeigt, daß die Polymerisation als kryp…
In this paper the theories of superexchange interaction developed by Kramers and Anderson have been more generally reformalized by means of the well-known vector model. The formulation can also be applied to the problem of molecular structure in which a consideration of the various orbital configurations of electrons…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGravimetric Determination of Thorium and Rare Earth Elements in Magnesium AlloysG. B. Wengert, R. C. Walker, M. F. Loucks, and V. A. StengerCite this: Anal. Chem. 1952, 24, 10, 1636–1638Publication Date (Print):October 1, 1952Publication History Published online1 May 2002Pub…