Materials Literature
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The Young's and shear moduli of polycrystalline monoclinic hafnium oxide were determined by the sonic resonance method at room temperature as a function of volume fraction porosity. The Spriggs equation empirically described the data and the zero porosity moduli as 283.6 GN/m 2 and 109.2 GN/m 2 for Young's and shear m…
The contributions of the Coulomb electrostatic interaction and the Born-Mayer repulsive interaction to the surface energy MgAl2O4 are calculated. These results are compared with the surface-energy values calculated from elastic constants. The results show that surfaces parallel to {111} planes are of lowest energy for…
The effective medium theory is developed for diffusion in random composite media. It is demonstrated that the theoretical diffusivity depends crucially on whether concentration or chemical potential is taken to be the field variable for describing transport.
Physiological properties of mutants of Escherichia coli defective in glyceraldehyde 3-phosphate dehydrogenase, glycerate 3-phosphate kinase, or enolase are described. Introduction of a lesion in any one of the reversible steps catalyzed by these enzymes impaired both the glycolytic and gluconeogenic capabilities of th…
The compatibility, morphology, and mechanical properties of poly-ϵ-caprolactone (PCL) blended with poly(vinyl chloride), nitrocellulose, and cellulose acetate butyrate are described in this study. Methods used in this investigation included differential scanning calorimetry, dynamic mechanical testing, small-angle lig…
The four isomers of hydroxycitrate have been tested as substrates and inhibitors for citrate synthase, citrate lyase, and ATP citrate lyase. None of the isomers served as a substrate for citrate synthase and they were moderate to weak inhibitors of this reaction. Of the four isomers, only (pncit)-(2S)-2-hydroxycitrate…
Valence band X-ray photoelectron spectra of the rutile oxides TiO 2 , RuO 2 , and IrO 2 show a distinct evolution as a function of the increasing number of metal d -electrons. The observations are found to be in excellent agreement with recent theoretical models. Intensity analysis and photo-ionization cross sections…
Journal Article Thermal Analysis of Minerals Get access Thermal Analysis of Minerals. Dumitru N. Todor, translated by Sergiu Marcus. Abacus Press, Tunbridge Wells, Kent, UK, 1976. Distributed by ISBS, Inc., PO Box 555, Forest Grove, OR 97116. 256 pp. Price $32.50. Millard Maienthal Millard Maienthal Division of Drug C…
The article is a review of band-structure calculations for transition metal compounds (carbides and nitrides, layer compounds, A15 structures, and others).
A glass‐forming region was found in the system at a mole ratio ≦3. Glass transition temperatures and conductivities at 25°C for the glasses are, respectively, expressed by where , , and are mole fractions of each component in the glass. These equations show that and are primarily governed by the content. From the resu…
Craze extension measurements have been made: (α) in unoriented commercial glassy polystyrene and polymethyl-methacrylate under uni-axial tension at both room temperature and – 20°C; and (6) in a special grade of unoriented polystyrene free of any additives, under a large variety of multi-axial states of stress, also a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of oxygenation of reduced sulfur species in aqueous solutionDennis J. O'Brien and Francis B. BirknerCite this: Environ. Sci. Technol. 1977, 11, 12, 1114–1120Publication Date (Print):November 1, 1977Publication History Published online1 May 2002Published inissue 1 No…
Although high‐temperature strength loss in ceramics such as silicon nitride has been attributed to the presence of intergranular amorphous phases, until now no direct proof has been offered. The present paper describes high resolution electron microscopy lattice imaging studies of an MgO fluxed hot‐pressed silicon nit…
An analysis of multidimensional melting is performed which takes account of natural convection induced by temperature differences in the liquid melt. Consideration is given to the melt region created by a heated vertical tube embedded in a solid which is at its fusion temperature. Solutions were obtained by an implici…
A series of epoxy resin based tissue substitutes, simulating adipose tissue, bone, breast, lung, muscle and skin is described. Details of the physical radiation characteristics of the formulated systems are given, together with the manufacturing procedures. The versatility of the range of substitutes is discussed in t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Anisotropic Solutions, and Fibers of Poly(1,4-benzamide)S. L. Kwolek, P. W. Morgan, J. R. Schaefgen, and L. W. GulrichCite this: Macromolecules 1977, 10, 6, 1390–1396Publication Date (Print):November 1, 1977Publication History Published online1 May 2002Published i…
Patterns in the plane from Kepler to the present, including recent results and unsolved problems.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of Aromatic and Extended Chain PolyamidesP. W. MorganCite this: Macromolecules 1977, 10, 6, 1381–1390Publication Date (Print):November 1, 1977Publication History Published online1 May 2002Published inissue 1 November 1977https://pubs.acs.org/doi/10.1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus-31 NMR studies on molybdic and tungstic heteropolyanions. Correlation between structure and chemical shiftRene Massart, Roland Contant, Jean Marc Fruchart, Jean Pierre Ciabrini, and Michel FournierCite this: Inorg. Chem. 1977, 16, 11, 2916–2921Publication Date (Pr…
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