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Abstract Qualitative and quantitative studies with model compounds have shown that a variety of reactions may occur at 100–300° in molecules containing isocyanate, urea and urethane groups. All or most of these reactions are subject to catalysis so that they may be induced to proceed at lower temperatures. These react…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous Solutions of Polyvinylsulfonic Acid: Phase Separation and Specific. Interactions with Ions, Viscosity, Conductance and PotentiometryH. Eisenberg and G. Ram MohanCite this: J. Phys. Chem. 1959, 63, 5, 671–680Publication Date (Print):May 1, 1959Publication History Publ…
The solubility of calcite in water is reported for temperatures between 100 and 300 degrees , at partial pressures of carbon dioxide ranging from 1 - 40 atmospheres. Values for the solubility product and the free energy of solution of calcite are derived. From a study of the kinetics of solution of a single calcite cr…
Abstract It has been noted in Part I of this series (referred to hereafter as I), that if a nicked specimen of a natural rubber vulcanizate is slowly stretched, tearing occurs at the tip for quite small applied forces. In the initial stages, this tearing continues only as long as the deformation of the specimen is bei…
The formation of BaTiO 3 from equimolar BaCO 3 and TiO 2 (rutile) mixtures was studied in air and in CO 2 . A small amount of BaTiO 3 is formed first directly from BaCO 3 and TiO 2 at the surface of contact. From then on it is a diffusion‐controlled reaction, and both BaTiO 3 and Ba 2 TiO 4 are produced, with Ba 2 TiO…
The magnetostatic solutions of ferrimagnetic resonance in ferrite spheres are briefly derived. General and specific solutions are given for values of n up to five for the magnetostatic potentials, rf distributions of magnetization, and fields for resonance. Some experimental results are given and compared with the the…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. E. Hale, H. W. Fuller, H. Rubinstein; Magnetic Domain Observations by Electron Microscopy. Jou…
The photoelastic constants and their dispersion for visible light were determined for two samples of vitreous silica, Corning and Herasil No. 1. The results for the mercury green line, 546 mμ, are quoted here. The photoelastic constants were 4.22×10−13 (d/cm2)−1 (ordinary ray) and 3.56×10−13 (d/cm2)−1 (extraordinary r…
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.