Materials Literature
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Abstract The flame retardation mechanisms for cellulose treated with systems based on aromatic phosphates and phosphoramides have been investigated through pyrolysis studies on cellulose and related model compounds. Pyrolysis of cellulose treated with phosphates or phosphoramides proceeds through formation of cellulos…
Y2O3 : Yb : Er and Gd2O3 : Yb : Er are efficient phosphors that emit red light when excited by the absorption of ir radiation. A number of processes are important in suppressing the green emission normally seen in erbium-ytterbium double-doped phosphors, and in emphasizing the often weak red emission. These processes…
Simplified structural models for mullite were investigated, and ir frequencies were calculated for the simplest model which gave the theoretical number of ir‐active frequencies compatible with the observed spectrum. This model, which consists of independently vibrating structural units, gives plausible frequency assig…
Beta alumina (Na 2 O·11 Al 2 O 3 ) with addition of MgO, NiO, ZnO, CuO and CaO, respectively, together with Na 2 O are sintered. Ionic conduction of Na + and X-ray diffraction of these samples are investigated. Additions of above divalent ions, except for Ca 2+ , increase the amount of Na + in β-alumina, leading to an…
Abstract The radiation damage of electron irradiated organic compounds (paraffin, tetracene) was investigated in the temperature range 300 - 4 K. The radiation damage was measured by the decrease of diffraction intensities or the contrast of extinction contours. The damage of the crystals at 4 K required considerable…
Variations in the thermal expansion coefficients, elastic moduli, and fracture strengths of Li 2 O‐SiO 2 glass‐ceramics were determined as a function of nucleation treatment and volume fraction of crystals present. Strength enhancement was attributed to a decrease in the mean free path between crystals as crystallizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimerization of a copper(II)-phthalocyanine dye in carbon tetrachloride and benzeneAlan R. Monahan, James A. Brado, and Allen F. DeLucaCite this: J. Phys. Chem. 1972, 76, 3, 446–449Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Publish…
Mutants of Escherichia coli and Salmonella typhimurium were selected on the basis of their spontaneous leakage of ribonuclease I. The mutants also leaked several other periplasmic enzymes into the medium during active growth but did not leak the intracellular enzymes glucose-6-phosphate dehydrogenase or phosphoglucose…
X-ray diffraction patterns of 14 substances have been studied in non-oriented samples in the smectic modification sA, sC, and sB. In all three modifications a sharp reflexion was found at small angles. At large angles a diffuse reflexion was found in the modifications sA and sC, and a sharp reflexion in the modificati…
In this article we propose a variational approach to the study of nonlinear elastic solids in which magnetization is constant in magnitude. The emphasis is placed upon the application of the different invariances used in modern continuum mechanics: Euclidean invariance, objectivity, and material symmetry. In Part I, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of tetratellurium(2+) tetrachloroaluminate and heptachlorodialuminate, Te42+(AlCl4-)2 and Te42+(Al2Cl7-)2Thomas W. Couch, Donald A. Lokken, and John D. CorbettCite this: Inorg. Chem. 1972, 11, 2, 357–362Publication Date (Print):February 1, 1972Publication…
From the Department of Surgery and Department of Biochemistry and Biophysics at the University of California, San Francisco, California 94122
Continuing studies on the improvement of the optical quality of lanthanum modified lead zirconate titanate (PLZT) ceramics have shown that (1) bulk residual porosity and (2) chemical inhomogeneity are primary factors contributing to optical losses in thick plates of the material. This paper describes methods by which…
Differential cross sections for electrons scattered inelastically from hydrogen have been measured at 18\ifmmode^\circ\else\textdegree\fi{}, 26\ifmmode^\circ\else\textdegree\fi{}, and 34\ifmmode^\circ\else\textdegree\fi{}. The range of incident energy was 4.5 to 18 GeV, and the range of four-momentum transfer squared…
An experimental study of the organic charge-transfer salt $N$-methyl-phenazinium tetracyanoquinodimethan (NMP-TCNQ) is presented. Magnetic-susceptibility, specific-heat, spin-resonance, and conductivity measurements indicate a metallic state above 200 \ifmmode^\circ\else\textdegree\fi{}K with a continuous transition t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of potassium halides in fused acetamideRichard A. WallaceCite this: Inorg. Chem. 1972, 11, 2, 414–415Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Published inissue 1 February 1972https://pubs.acs.org/doi/10.1021/ic50108a04…
X-ray diffraction methods are applied to determine the cation distribution and the oxygen positional parameter in low-substituted magnetites with Al3+, Ga3+, or In3+ as substituents. It is possible to conclude that the tetrahedral site preference increases in the sequence Al3+, Fe3 +, In≃Ga3+, in good agreement with m…
Abstract Measurements are reported which show that the room-temperature nematic MBBA can be deformed by means of curvature electricity if it is contained in a thin sandwich cell with the electric field parallel and the unique axis normal to the bounding walls. Meyer's coefficient e 33 was determined to be 4 · 10 -5 dy…
For Pt. I see ibid., vol. 4, 625 of 1971 The potential distribution inside three equidiameter coaxial cylinders separated by finite distances has been used to calculate the focal lengths, mid focal lengths and spherical aberration coefficients of some triple cylinder einzel lenses. The lenses considered have the lengt…
Boron arsenide, a semiconductor with an energy gap of 1.46 eV, decomposes irreversibly at temperatures above 900 °C, thus limiting the temperature of the crystal growth process. In this work, single crystals of boron arsenide, identified by the x-ray diffraction method, have been prepared by the chemical transport of…