Materials Literature
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Expressions for the self-energy and interaction probability of charged particles in a degenerate Fermi-Dirac electron gas are given, generalizing from the dielectric theory of Lindhard and Hubbard and treating interactions between electrons in the gas by first order perturbation theory. Numerical results for the inter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization Reactions of Itaconic Acid and Some of Its DerivativesC. S. MARVEL and THOMAS H. SHEPHERDCite this: J. Org. Chem. 1959, 24, 5, 599–605Publication Date (Print):May 1, 1959Publication History Published online1 May 2002Published inissue 1 May 1959https://pubs.acs…
Young's modulus as a function of temperature was determined by a dynamic method for single‐crystal sapphire and ruby and for polycrystalline aluminum oxide, magnesium oxide, thorium oxide, mullite, spinel, stabilized zirconium oxide, silicon carbide, and nickel‐bonded titanium carbide. For the single crystals, Young's…
The thermodynamic treatment of nonuniform systems of Cahn and Hilliard is shown to be equivalent to the self-consistent thermodynamic formalism of Hart. All parameters of the two treatments have been rigorously related and key equations have been shown to be equivalent.
A model is presented for the excited states of porphin, which are viewed as arising from two configurations which can be mixed to varying degrees. The effects of substituents are then discussed, first the limitations imposed by symmetry requirements and then the requirements imposed if they act as one electron perturb…
The Morse parameters were calculated using experimental values for the energy of vaporization, the lattice constant, and the compressibility. The equation of state and the elastic constants which were computed using the Morse parameters, agreed with experiment for both face-centered and body-centered cubic metals. All…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConstitution of Binary Alloys.Harold MargolinCite this: J. Am. Chem. Soc. 1959, 81, 10, 2600Publication Date (Print):May 1, 1959Publication History Published online1 May 2002Published inissue 1 May 1959https://pubs.acs.org/doi/10.1021/ja01519a085https://doi.org/10.1021/ja015…
In pure dielectric crystals, the isotopic variations of atomic mass contribute a temperature-independent thermal resistance at high temperatures. This resistance has been calculated using a Debye model of the vibrational spectrum. Umklapp processes are treated as the dominant scattering mechanism. The distribution of…
The effect of temperature on the magnetic properties of six commercially available nickel-iron alloys is reported for the temperature range −60°C to +250°C. The trade names of the alloys are: Hipernik, Deltamax, Hipernik V, Supermalloy, 4-79 Mo-Permalloy, and Hymu 80. The temperature dependence of both ac and dc magne…
The paper represents an attempt by a person trained in probability theory to survey some of the problems involved in evaluating structural safety. A review is presented of the probabilistic considerations involved in evaluating the strength of materials, and the construction of so called S-N curves. A probabilistic mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat Transfer Effects - Molecular Orientation of OctadecaneRodney Sutherland, Robert Davis, and William SeyerCite this: Ind. Eng. Chem. 1959, 51, 4, 585–588Publication Date (Print):April 1, 1959Publication History Published online1 May 2002Published inissue 1 April 1959https…
SYNOPSIS Some new and interesting Diatoms from the Jog‐Falls are described and illustrated. One species of Achnanthes is re‐interpreted and five varieties are described as new to science.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption of Normal Olefins on Silica-Alumina CatalystsD. S. MacIver, R. C. Zabor, and P. H. EmmettCite this: J. Phys. Chem. 1959, 63, 4, 484–489Publication Date (Print):April 1, 1959Publication History Published online1 May 2002Published inissue 1 April 1959https://pub…
Abstract The method of stress relaxation has been used to study oxidative scission in crosslinked rubbers of five different chain structures. Each chain structure was crosslinked by sulfur and by a nonsulfur‐containing agent. Among the sulfur‐cured vuleanizates the rate of scission varied very significantly with chain…
Measurements are reported of the attenuation at 9360 mc of full height ferrite slabs in wave guide as a function of ferrite length up to input powers of 120 kw. The ferrites were transversely magnetized to the field for subsidiary resonance. Above the critical power level for the subsidiary resonance the output power…
Mn X Co (80− X ) C 20 alloys were studied for magnetic properties, crystal structure, and metallographic appearance. A superlattice having the stoichiometric composition Mn2Co2C was found to be markedly magnetic. The structure of this alloy is pseudo-f.c.c. with the C atom in the central 121212 position, the Mn atoms…
Abstract Natural rubber is converted by reaction with a small amount of a thiol acid into a modified rubber which crystallizes at low temperatures much more slowly than the original rubber. This change in rate of crystallization is probably due to the conversion of some of the cis double bonds in natural rubber into t…
Abstract The G value for crosslinking of polydimethylsiloxanes by high energy electrons has been redetermined using cryoscopc methods and checked by quantitative determinations of the amounts of gases evolved. The value found, G = 2.5 ± 0.4, is significantly different from that reported previously. The swelling of hig…
Internal isotropic strain in Permalloy films having a negative magnetoelastic constant creates a magnetoelastic easy axis normal to the film. Below a critical thickness tc such films are single domain in the film plane and have a square B-H loop; above this thickness new configurations are established, characterized b…
The magnetic anisotropy energy is measured as a function of temperature in eleven single crystal compositions corresponding to MnxFe3−xO4, where x is varied from 0.00 to 1.90. The interesting features observed are as follows. (1) Small manganese concentrations in magnetite (x=0) are shown to decrease the temperature o…