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Two main processes account for heat conduction in glass. At low temperatures the major process corresponds to energy transfer via thermoelastic waves. The thermal conductivity resulting from this process is low as a result of strong scattering by the random structure. At high temperatures this conduction process is ov…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTEngineering Aspects of Solid CatalystsOlaf HougenCite this: Ind. Eng. Chem. 1961, 53, 7, 509–528Publication Date (Print):July 1, 1961Publication History Published online1 May 2002Published inissue 1 July 1961https://pubs.acs.org/doi/10.1021/ie50619a020https://doi.org/10.1021/ie5…
In this paper, the application of several techniques of molecular structure deter mination to polyethylene terephthalate (henceforth abbreviated to PET) polymer and fibers will be described. These investigations have been directed partly towards obtain ing an understanding of the dynamic mechanical properties of PET a…
The complex dielectric constant of single-crystal strontium-titanate has been measured from 90\ifmmode^\circ\else\textdegree\fi{} to 230\ifmmode^\circ\else\textdegree\fi{}K at microwave frequencies. The real part of the dielectric constant consists of a large field-independent contribution which obeys a Curie-Weiss la…
Using a miniature spherical hydrophone made of barium titanate, the individual cavity collapse was detected as a sharp impulse (0.5 µs width) slightly after the pressure maximum of sound cycle. When may cavities collapsed simultaneously, sinusoidal sound-pressure waveform was turned into saw-tooth form. By comparing t…
Helium permeation rates have been determined through 20 different glasses using a mass spectrometer to measure the gas flow rates directly. The temperature range investigated was 25°–500°C. Values of diffusion constants and solubilities have been computed for 10 of these glasses. The permeation rate has been related t…
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 J. J. Gilman, B. W. Roberts; Elastic Constants of TiC and TiB2. Journal of Applied Physics 1 July…
The paper presents new measurements of the optical constants and of the reflectance and transmittance of evaporated aluminum films produced from the purest grade of aluminum with extremely fast evaporation at about 10−5 mm Hg. The optical constants were determined by Drude’s polarimetric method from opaque films and b…
A general theory of the polarization waves in crystals is developed in connection with the optical and the dielectric properties of the crystals. The result includes, in more general form, the relations by Szigeti and Fröhlich about the lattice vibrations in ionic crystals and the theory by Heller and Marcus for the e…
An examination is made of the spin-lattice relaxation in the solid state of nuclei whose energy level spacings in a magnetic field are rendered unequal by quadrupole interactions with the crystalline electric field. Attention is directed to two special cases: (1) when the main magnetic field is suddenly increased from…
Selected mixtures in 69 binary systems involving Ab03, Ga20 a, CrZ0 3, Fe20 a, SczOa, In20 3, Y20 3, and the rare earth oxides were stud ied by X-ray diffraction techniques after heat treatment at various temperatures. A plot of the radii of the A +3 cations versus the radii of B+3 cations shows the regions of stabili…
Abstract Studies were conducted to determine why certain soil test methods fail to indicate the actual lime requirement in many Ohio soils. Samples of 14 soils from various areas of the State were collected for study. The soils were incubated with various rates of applied CaCO 3 to determine actual lime requirement of…
A systematic study of the problem of spherulitic growth in linear polymers in bulk has been carried out. A calculation of the radial growth of polymer spherulites is given for four models. These concern growth where the surface nuclei that control the rate are (1) bundlelike and coherent, (2) chain folded and coherent…
ESR spectra of copper complexes have been interpreted by means of molecular orbital theory, and the ``covalent'' character of both σ and π bonds have been discussed for a variety of compounds. Overlap integrals have been considered in a consistent manner in treating σ bonds. Particular attention has been given to Cu p…
X-ray analyses of some Recent desert lacustrine sediments in Nevada, California, and Oregon show that illite and montmorillonite are the most abundant clay minerals and that chlorite and kaolinite are present in subordinate amounts in the sediments of many of the lakes. These clay suites are derived from source rocks.
The effect of electron-electron scattering processes due to Coulomb forces on the transport phenomena in nonpolar isotropic solids is treated in the framework of Kohler's variation principle. By considering the conduction electrons as a Fermi-Dirac gas of noninteracting free quasi-particles, each with charge $\ensurem…
Young's modulus was measured over the temperature range 77\ifmmode^\circ\else\textdegree\fi{}-850\ifmmode^\circ\else\textdegree\fi{}K by an accurate resonance technique. Data are presented for single crystals of aluminum oxide with various orientations of the crystallographic axes and for polycrystalline aluminum oxid…
Samples of graphite have been recovered after exposure to explosive shocks of 300,000-atm estimated intensity. X-ray and electron-diffraction examinations prove the existence of diamond in this material. The mechanism proposed for the formation of diamond under these conditions is simple compression in the c-axis dire…
Abstract A systematic investigation has been made of the effect of fatty acid composition on the compatibility of the corresponding mixed morpholides as plasticizers for vinyl chloride‐vinyl acetate copolymer resins. Plasticizer evaluation data were obtained for the morpholides of lauric, palmitic, elaidic, and epoxyo…
In the paper is discussed the stability of elastic structures which are liable to become unstable under load. In particular the behaviour of the system, comprising an elastic structure and its loading device is considered, and theorems concerning this behaviour are presented. The theorems allow considerable informatio…