Materials Literature
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Anisotropy Induced during Compression Molding o f RubberMany physical tests of elastomeric vulcanizates are carried out using specimens cut from flat sheets that were prepared by compression molding.Generally, an excess quantity of rubber is placed into the mold to assure that the mold cavity will be completely filled…
X-ray absorption spectroscopy has been used to study the dimeric iron center in azidomethemerythrin from Phascolopsis gouldii. Absorption edge data confirm that the two iron atoms are present as Fe(III) and suggest a hexa-coordination site for each of the iron atoms. The extended x-ray absorption fine structure (EXAFS…
Many of the techniques available to determine energy content have problems inherent in their use on samples with a high proportion of inorganic minerals. One technique which may readily be used on such samples is wet oxidation, in which the sample is quantitatively chemically oxidized. However, this technique is infre…
The precipitation process of solid phases Mg 3 (OH) 5 CI‐4H 2 O (phase 5), Mg 2 (OH) 3 CI‐4H 2 O (phase 3), and Mg(OH) 2 was followed by the addition of NaOH water solution in MgCl 2 water solutions of different concentrations (0.001 to 4.8 mol dm −3 ) and characterized by chemical, potentiometric, coulometric, and X‐…
The Abbe transform is used to derive rigorous algebraic formulas for the wave function describing Fraunhofer diffraction at apertures in the form of arbitrary polygons. Two remarks bring the Abbe transform and the Abbe theorem into the context of the history of diffraction.
Formation of BaTiO 3 ‐SrTiO 3 solid solution during sintering of powder mixtures is characterized by preferential diffusion of Ba 2+ ions. As a consequence, several nonequilibrium phases are temporarily formed; they were identified by X‐ray and microprobe analysis. Eutectic liquid appears below 1300°C, which may expla…
Abstract Mixed-layer clays composed of randomly interstratified kerolite/stevensite occur as lake and/or spring deposits of probable Pliocene and Pleistocene age in the Amargosa Desert of southern Nevada, U.S.A. The percentage of expandable layers of these clays, determined from computer-simulated X-ray diffractograms…
We have studied the adsorption of pure CO and CO:H2 mixtures on powdered ZnO using the combined techniques of transmission infrared spectroscopy and temperature programmed desorption (TPD). When CO is adsorbed alone, the vibrational frequency ωCO decreases from 2192 to 2178 cm−1 with increasing CO coverage, and a repu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelting-crystallization and premelting properties of sodium nitrate-potassium nitrate. Enthalpies and heat capacitiesDerek J. Rogers and George J. JanzCite this: J. Chem. Eng. Data 1982, 27, 4, 424–428Publication Date (Print):October 1, 1982Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew copper chemistry. V. New heterocuprates with greatly improved thermal stabilitySteven H. Bertz, Gary Dabbagh, and G. M. VillacortaCite this: J. Am. Chem. Soc. 1982, 104, 21, 5824–5826Publication Date (Print):October 1, 1982Publication History Published online1 May 2002Pu…
The fabrication of transparent conducting films of ZnO is described. These films are deposited on room temperature glass substrates using an enhanced reactive evaporation technique in which the power in a dc glow discharge, the oxygen pressure, and the zinc evaporation rate are controlled separately. Each of these par…
Abstract Deposits of sepiolite, trioctahedral smectite (mixed-layer kerolite/stevensite), calcite, and dolomite, found in the Amargosa Flat and Ash Meadows areas of the Amargosa Desert were formed by precipitation from nonsaline solutions. This mode of origin is indicated by crystal growth patterns, by the low Al cont…
We explain the compensation effect by counting the ways in which the heat bath can furnish the energy necessary to surmount the barriers.Received 15 March 1982DOI:https://doi.org/10.1103/PhysRevB.26.3774©1982 American Physical Society
The design of concentric-neutral plastic-insulated power cables has been optimized for the transmission and distribution of large quantities of 60-Ηz power at high voltages. Understanding the mechanism of high frequency propagation in these cables is important in order to evaluate the sensitivity of partial discharge…
J. E. Turner, H. G. Paretzke, R. N. Hamm, H. A. Wright, R. H. Ritchie, Comparative Study of Electron Energy Deposition and Yields in Water in the Liquid and Vapor Phases, Radiation Research, Vol. 92, No. 1 (Oct., 1982), pp. 47-60
Abstract The relationship was determined between sub‐ T g molecular motions and the transport of O 2 and CO 2 in amorphous polyesters and copolyesters based on poly(ethylene terephthalate) [PET] and poly(1,4‐cyclohexylenedimethylene terephthalate) [PCDT], Modifications of the polyester with certain acid co‐monomers re…
Novel low threshold nematic mixtures are presented exhibiting very low dielectric crossover frequencies fc ≃ 1 kHz at 20°C and unusually large, low- as well as high-frequency dielectric anisotropies ΔEL > 4 and ΔEH < 4 respectively. ΔEL and ΔEH are shown to be independently adjustable. The frequency and temperature de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular theory of nematic liquid crystalsWilliam M. GelbartCite this: J. Phys. Chem. 1982, 86, 22, 4298–4307Publication Date (Print):October 1, 1982Publication History Published online1 May 2002Published inissue 1 October 1982https://doi.org/10.1021/j100219a007RIGHTS & PER…
Individual platinum-group elements, as well as Au, Cu, and Ni, were determined in borehole cores of the UG-2 chromitite layer from different localities in the Bushveld Complex. The average noble metal content of the layer is about 7 ppm; Pt is most abundant, followed by Pd, Ru, Rh, Ir, and Au, in that order. Noble met…
A linear least-squares computer program that implements the procedure described by Shoemaker & Bassi [Acta Cryst. (1970), A26, 97–101] has been written. With this technique constraints appropriate to the lattice symmetry may be imposed during refinement of the coefficients of the orientation matrix. Cell parameters an…