Band structure of transition metal compounds
The article is a review of band-structure calculations for transition metal compounds (carbides and nitrides, layer compounds, A15 structures, and others).
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Superionic Conducting Glasses: Glass Formation and Conductivity in the AgI ‐ Ag2 O ‐ P 2 O 5 System
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…
Growth of crazes in glassy polymers
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…
Kinetics of oxygenation of reduced sulfur species in aqueous solution
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…
Grain Boundary Phases in a Hot‐Pressed MgO Fluxed Silicon Nitride
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…
Analysis of Melting in the Presence of Natural Convection in the Melt Region
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…
Epoxy resin based tissue substitutes
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…
Synthesis, Anisotropic Solutions, and Fibers of Poly(1,4-benzamide)
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…
Tilings by Regular Polygons
Patterns in the plane from Kepler to the present, including recent results and unsolved problems.
Synthesis and Properties of Aromatic and Extended Chain Polyamides
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…
Phosphorus-31 NMR studies on molybdic and tungstic heteropolyanions. Correlation between structure and chemical shift
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…
Random Decrement Technique for Modal Identification of Structures
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
The Protein Data Bank
The Protein Data Bank is a computer-based archival file for macromolecular structures. The Bank stores in a uniform format atomic co-ordinates and partial bond connectivities, as derived from crystallographic studies. Text included in each data entry gives pertinent information for the structure at hand (e.g. species…
The crystal structure of Prussian Blue: Fe4[Fe(CN)6]3.xH2O
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe crystal structure of Prussian Blue: Fe4[Fe(CN)6]3.xH2OH. J. Buser, D. Schwarzenbach, W. Petter, and A. LudiCite this: Inorg. Chem. 1977, 16, 11, 2704–2710Publication Date (Print):November 1, 1977Publication History Published online1 May 2002Published inissue 1 November 1…
The effect of Brownian motion on the bulk stress in a suspension of spherical particles
The effect of Brownian motion of particles in a statistically homogeneous suspension is to tend to make uniform the joint probability density functions for the relative positions of particles, in opposition to the tendency of a deforming motion of the suspension to make some particle configurations more common. This s…
Quantum Limit of Ferroelectric Phase Transitions inKTa1−xNbxO3
Dielectric and elastic constants of $\mathrm{K}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{Nb}}_{x}{\mathrm{O}}_{3}$ are presented as a function of $x$ and of the temperature. For $x=8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, the system exhibits the characteristics of a ferroelectric at the displacive li…
Chemical shifts and effective charges in ternary and complex systems
Effective charges, q, in ternary and complex systems are estimated. The semiempirical method of Suchet (1965) is extended to ternary compounds such as manganites and ferrites while the semi-experimental method of Gianturco and Coulson (1968) is applied to complex Co-Zn ferrites and cobalt complexes. An attempt is made…
Uniaxial stress studies of the 2.498 eV (H4), 2.417 eV and 2.536 eV vibronic bands in diamond
Abstract The H4 vibronic band is the dominant end product of annealing irradiated diamonds which contain impurity nitrogen in one specific aggregated form, the ‘B’ form. This paper reports uniaxial stress experiments on the H4 zero phonon line, and establishes it unambiguously as a (110) electric dipole transition at…
Electrical Conductivity in Doped Polyacetylene
Doped polyacetylene forms a new class of conducting polymers in which the electrical conductivity can be systematically and continuously varied over a range of eleven orders of magnitude. Transport studies and far-infrared transmission measurements imply a metal-to-insulator transition at dopant concentrations near 1%.
Magnetic, electrical, and thermal studies of the V1−xRexO2 system with 0 ≦x ≦ 0.15
The insulator–metal transition of VO2 and VO2 doped with Re is studied by means of DTA, X-ray diffraction, magnetic susceptibility, and electrical conductivity measurements. A linear decrease of the transition temperature of 18 K/at% Re is observed. The low-temperature phase is found to be temperature-independent para…