Materials Literature
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This paper presents and discusses particle behavior at solidification fronts from a thermodynamic point of view. Engulfing or rejection of particles embedded in a melt by solidification fronts depends on whether such quantities as the free energy of adhesion or of engulfing are positive or negative. As the relevant en…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLabile (trifluoromethanesulfonato)cobalt(III) amine complexesNicholas E. Dixon, W. Gregory Jackson, Martin J. Lancaster, Geoffrey A. Lawrance, and Alan M. SargesonCite this: Inorg. Chem. 1981, 20, 2, 470–476Publication Date (Print):February 1, 1981Publication History Publish…
An experimental procedure is described which allows the determination of the viscosity coefficients η1, η2, η3 and η12 for nematic liquid crystals as a function of temperature. Errors which arise from the surface and the flow alignment are discussed in detail. The measurements are performed on the nematic liquid cryst…
<div class="htmlview paragraph">An innovative design of ceramic filter for diesel engine exhaust particulate matter is described. It is a cellular ceramic honeycomb with porous walls which act as the filter medium. Test results relating the effects of wall thickness, cell density, porosity, and filter volume on…
Two calcium-stimulated protein kinase activities (ATP:protein phosphotransferase, EC 2.7.1.37) that phosphorylate protein I, a specific synaptic protein, have been identified in homogenates of rat brain. One of these is found in both the particulate and cytosolic fractions and phosphorylates a region of protein I that…
A generalized treatment of the parabolic oxidation of pure metals forming electronically semiconducting oxides containing different kinds of defects is developed by extending the Kröger approach to Wagner's theory of oxidation based on the analysis of the diffusion of lattice defects. Only oxides with defects in the c…
The spectrum of the luminescence in silica core optical fibers under x-ray excitation has been observed to consist of two distinct emission bands at 450 and 650 nm. The contrasting dose-dependent behaviors of the two bands show that they are associated with different luminescent centers in the glass matrix. The applic…
The permeation time-lag method have been used to determine the permeabilities, diffusion coefficients and solubilities of hydrogen and deuterium in type 304 stainless steel of three kinds of surface treated specimens; with oxide film, reduced by H2 gas and Pd coated. For the specimen with a thin oxide film the permeab…
Abstract As shown by scanning and transmission electron microscopy, halloysite in three rhyolitic tephras occurs as squat and elongate ellipsoids. Both morphologies are presumed to result from a similar lattice building mechanism. The squat ellipsoids form from allophane; the elongate ellipsoids form from feldspars. T…
Abstract Because of discrepancies in the literature a redetermination of the structure of talc Mg 3 [(OH) 2 Si 4 O 10 ] is reported. Space group of talc is P [unk] with lattice parameters a 0 = 529.1(3) pm, b 0 = 946.0(5) pm, c 0 = 529.0(3)pm, α = 98.68(5)°, β = 119.90(5)° and γ = 85.27(5)°, Z = 2. Transformation by a…
In heme-deficient reticulocytes and their lysates, a heme-regulated inhibitor of protein synthesis is activated; this inhibitor is a cyclic AMP-independent protein kinase that specifically phosphorylates the alpha subunit of the eukaryotic initiation factor 2 (eIF-2 alpha). Heme regulates this kinase by inhibiting its…
Microstructural characterization of conventionally sintered, hot‐pressed, reaction‐sintered, and chemically vapor‐deposited polycrystalline SiC shows that the initial stages of the β→α transformation in the first three materials are similar, the process being dominated by the elimination of high‐energy β→α interfaces.…
Semianalytical formulas are developed to predict scabbing and perforation thicknesses for reinforced concrete panels subjected to impacts by solid steel missiles. The scabbing thickness is defined as the thickness that is just enough to prevent the peeling off of the back face of the panel opposite to the face of impa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and relation between magnetism and structure of a trinuclear copper(II) hydroxo complex [Cu3OHL3(ClO4)]ClO4 and a hexanuclear copper(II) oxo complex [Cu3OL'3(ClO4)]2(LH=3-(phenylimino)butanone 2-oxime, L'H=1,2-diphenyl-2-(methylimino)ethanone 1-oxime)Ray J. Butcher…
The final stages of the β→α polymorphic phase transformation in conventionally sintered and hot‐pressed SiC were studied by optical and transmission electron microscopy. The interface between the α and β regions of partially transformed grains invariably contains thin α lamellae adjacent and parallel to coherent β twi…
Compressive strength of SiC and Al 2 O 3 is determined over a wide range in loading rate. The results are interpreted in terms of the tensile growth of axial microcracks, controlled by two distinct mechanisms. The first is a material‐dependent, thermally activated process operative at strain rates 10 2 s; the other is…
The influence of potential and nominal sea water velocity upon the nature of calcareous deposits formed upon a cathodic steel surface has been investigated. Specific attention was focused upon change with exposure time of the current density to maintain a prescribed cathodic potential and upon thickness of the calcare…
Abstract Measurements on the thermal expansivity α ∥ and α ⟂ (along and normal to the draw direction, respectively) have been carried out for a series of oriented polymers with widely different crystallinities (0.36–0.81) and draw ratios (1–20) and over large temperature ranges covering the major amorphous transitions…
Copolyesters (CPEs) prepared by the transesterification reaction between aromatic and aliphatic polyesters were hydrolyzed by Rhizopus delemar lipase. The susceptibility of CPEs to hydrolysis by this lipase dropped off rapidly during the initial stage of the transesterification reaction and increased gradually as the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew approach to bonding in transition-metal clusters and related compoundsA. J. StoneCite this: Inorg. Chem. 1981, 20, 2, 563–571Publication Date (Print):February 1, 1981Publication History Published online1 May 2002Published inissue 1 February 1981https://pubs.acs.org/doi/1…