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In cuprous oxide we discovered a new hydrogen-like absorption spectrum beside that in the previous work. Thus we have two groups of hydrogen-like energy levels, of which the one previously found seems to be due to a self-trapped electron and the other newly found on the other hand, seems to be due to an exciton and le…
We used borax to obtain homogenous solid solutions of thorium and uranium dioxides in the temperature range
Information is presented which indicates that standards are still inadequate to differentiate clearly the temperature classes of insulation and several changes are suggested to improve and broaden those standards.
T he res ul ts of m easurements of the corrosion of galvan ized steel and of bare steel and zinc as reference materials after exposure to different soil co ndi tions for a maximum of 13 years arc reported. The magnitude and progress of co rrosion of galvanized steel as determ ined by weight loss and pitting is interpr…
Further quantitative data bearing on the scabbing of metals under explosive attack are presented in this paper. In particular, the mechanics of the generation of multiple scabs is established. Experimental data have been obtained that show that multiple scabbing will occur whenever the maximum stress σ0 in the transie…
The hafnium-hydrogen system at room temperature consists of three phases. The lattice parameters of the hafnium metal used in this investigation and of the three phases are as follows: hafnium, a0=3.200A, c0=5.061A, and c=1.58; deformed cubic phase, a0=4.702±0.012A, c0=4.678±0.012A, and c=0.995; face-centered cubic ph…
The molecular weight of lysozyme has been redetermined by the ultracentrifuge as 14,100 ± 500. The molecule appears to be a stubby prolate ellipsoid of rotation, with a maximum length of 90 Å and a minimum equatorial diameter of about 18 Å depending on the degree of hydration assumed. Alternative possibilities of chai…
The crystal structure of realgar, AsS, has been worked out by the Fourier-synthesis method, using Weissenberg photographs (Cu Ka 2. ~-1.54/~). The signs for F's were initially derived by the phaseinequality relations of Harkcr & Kasper. The unit cell has a ~ 9.27, b ~ 13.50, c ----6.56 A, fl --106 37'. The space group…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChloromethylation of PolystyreneGiffin D. JonesCite this: Ind. Eng. Chem. 1952, 44, 11, 2686–2693Publication Date (Print):November 1, 1952Publication History Published online1 May 2002Published inissue 1 November 1952https://pubs.acs.org/doi/10.1021/ie50515a054https://doi.or…
The structure, thermal properties, electrical characteristics, and mechanical behavior of graphite are reviewed and the highly anisotropic character of graphite crystals is emphasized. The interesting properties of graphite are due in large measure to the strong semimetallic bonds between carbon atoms in plane layers…
A metallographic study was made of the diffusion zones present in copper-α-brass, copper-nickel, and gold-silver diffusion couples. Usual sandwich type couples and also vapor-solid type couples in which the higher vapor pressure component was diffused either into or out of the couple through the vapor phase were inves…
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…