Materials Literature
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The authors study crystalline systems which as far as the electrons are concerned behave like composites of diatomic molecules loosely coupled together. The electrons are in molecular states which weakly overlap between neighbouring molecular sites. They examine a linear chain of such molecules which are oriented orth…
A thorough analysis of the direct CI method as applied to the case of a general set of reference configurations coupled to all single and double substitutions is presented. It is pointed out that there is no single strategy which proves optimal under all circumstances. A variety of procedures are therefore presented t…
A theory of dielectric response that accounts for the nonsteady-state nature of many-body interactions in transient processes is presented. It is shown that the theory leads to the observed dielectric properties. Comparisons are also made with existing theories as regards their predictions, consequences and shortcomin…
Abstract Weak-beam electron microscopy has been applied to study the dissociation of dislocations in a type II a diamond. Dislocations with Burgers vector ½[11̅0] on (111) glide planes have been found to be dissociated into two Shockley partials, with separations between 2.5 and 4.3 nm, and extended nodes and dissocia…
Abstract The features of minor loop behaviour in magnetic hysteresis are examined by comparing some experimental data on a Mn‒Al‒Ge film with two phenomenological models. The ‘independent particle’ model of Preisach and Everett proves to describe qualitatively all the observed behaviour. This model is generalized slig…
The $\ensuremath{\alpha}\ensuremath{\rightleftarrows}\ensuremath{\beta}$ phase transition in AgI is studied with use of the new molecular-dynamics technique which allows for a dynamical variation of the shape and size of the cell. In the present model, upon heating of $\ensuremath{\beta}$-AgI, the iodine ions undergo…
Abstract Two MO indices are found to correlate well with the toxicity of 1‐substituted silatranes.
This study investigates the effects of partial flow blockage due to ballooning of fuel cladding on the core heat transfer during reflood phase in a PWR loss-of-coolant accident, in particular, the effects of coolant bypass flow at flow blockage and the effects of major parameters in a wide core with a bundlewise flow…
The system of electron currents in the specimen chamber of a scanning microscope is analysed in detail for specimens of gold and aluminium. General conclusions are drawn about the magnitudes of the component currents for other types of specimen. Measurements of the efficiency of collection of electrons by the scintill…
Refractory oxide films of Al2O3, SiO2, MgO, and Al2MgO4 have been grown in a molecular beam epitaxy (MBE) system using As2O3 and Sb2O3 as the oxygen source. On the growth surface, elements such as Al whose oxide is more stable than the group V oxide will reduce the group V oxide and form a refractory oxide. With the g…
The reaction of carbon with hydrogen to form methane in the presence of platinum particles is studied. Kinetics studies are combined with TEM techniques that allow particle shape and structure to be obtained. The methane production has two peaks at 800 and 950 °C. The reaction always involves pitting or channeling by…
The design and use of a simple, robust and sensitive vibrating sample magnetometer (VSM) is outlined. Magnetic data are presented for various classes of magnetic materials, ranging from paramagnetics to ferromagnetics. In its simplest form the VSM requires only a digital voltmeter for signal analysis. Thus it is ideal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of thermal regeneration of fibrous diesel-particulate filtersFarhang Shadman and Edward J. BissettCite this: Ind. Eng. Chem. Process Des. Dev. 1983, 22, 2, 203–208Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published inissue 1…
The kinetics of the electrochemical insertion of lithium into sodium tungsten bronzes, to form the mixed alkali bronzes, have been studied, using transient techniques. The chemical diffusion coefficient of Li in single crystal samples was found to decrease with increasing lithium and sodium concentrations from initial…
Styrene was copolymerized with 2,3-dibromopropyl acrylate, 2,4,6-tribromophenyl acrylate, or pentabromophenyl acrylate in either aqueous emulsion, dimethylformamide, or benzene solutions with a free radical initiator, and the thermal and flammability properties of the resulting polymers are described. The reactivity r…
CuX ( X = Cl or Br ) is formed during the galvanostatic pulse plating of copper from acid solutions containing Cu 2+ and X − . The reaction Cu 2 + + Cu 0 + 2 X − → 2 CuX occurs in the relaxation period of the pulse. Copper (I) chloride anodes for reserve seawater batteries may be made by this method. CuBr is oriented…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomeric bis[(phenylazo)acetaldoximato]platinum(II) compoundsDebkumar Bandyopadhyay, Pinaki Bandyopadhyay, Animesh Chakravorty, F. Albert Cotton, and Larry R. FalvelloCite this: Inorg. Chem. 1983, 22, 9, 1315–1321Publication Date (Print):April 1, 1983Publication History Publ…
The influence of temperature and associated dislocation microstructure on the energetics of basal plane cleavage in zinc crystals has been investigated using the method of Hull, Beardmore, and Valentine (HBV). A marked temperature dependence was observed in the zinc surface energy, over the range 77–298 °K, contrary t…
The electrical conductivity of single crystalline SrTi 1- x V x O 3 (0.1≦ x ≦1) was measured down to 4.2 K. The depth of the donor level of V 4+ in SrTiO 3 was about 0.6 eV. The metal-nonmetal transition occurred at x ≃0.6 with σ≃280 Ω -1 cm -1 and the conductivity increased with x up to about 2×10 4 Ω -1 cm -1 at x =…
The reactions of 1-lithioalkoxyethylenes with hexafluorocyclotriphosphazene (N3P3F6) have been examined. In contrast to similar reactions of propenyl lithium with N3P3F6, no evidence for degradation reactions via anionic attack on the olefinic center was observed and the reaction proceeds smoothly to yield N3P3F6-N (C…