Materials Literature
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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…
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 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…
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 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…
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…
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…
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…
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%.
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…
Photoluminescence of GaSe is measured between 4.2 and about 40 K. The spectra of many samples are classified into three types. The first type has only one broad peak at about 2.04 eV, and the second type has two sharp lines at 2.096 and 2.088 eV followed by some lines at the lower energy side. The last one contains a…
The substitution of Ca2+ ions in magnetite is studied, mainly by Mössbauer spectroscopy. The Ca2+ ions are located at the tetrahedral sites and the conduction electrons can be described by a band model. The magnetite structure can at most contain 6.67 wt% of Ca. The presence of a Ca2+ ion at an A-site decreases the hy…
An equilibrium method for the determination of the vacancy formation volume in many metals is provided by the trapping of positrons at vacancies. Utilizing a Bridgman press and angular-correlation counting techniques, the vacancy formation volume in metallic indium has been determined to be 6.1 \ifmmode\pm\else\textpm…
The visible interaction of low-intensity ultrasonic waves with a nematic liquid crystal may be explained simply by the hypothesis of a torque tending to orient LC molecules perpendicular to the vibrations. It is shown how this torque can be related to anisotropic attenuation of ultrasound and minimization of propagati…
Measurements of the thermal impedance across copper-epoxy-copper sandwiches have been made over a temperature range of 0.05-10 K. The data are consistent with the suggestion that only low-frequency phonons contribute to thermal transport across the sandwich. As a result the apparent thermal boundary resistance at the…