Materials Literature
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We report the determination of the impact ionization rates for holes and electrons in Ga0.47In0.53As with the electric field oriented in the 〈100〉 direction. Our measurements show that the ionization rate for electrons α is greater than that for holes (β) by about a factor of 2 over electric fields ranging from 2.0×10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of porphyrin ferryl (FeO2+) complexes through the addition of nitrogen bases to peroxo-bridged iron(III) porphyrinsDer-Hang Chin, Alan L. Balch, and Gerd N. La MarCite this: J. Am. Chem. Soc. 1980, 102, 4, 1446–1448Publication Date (Print):February 1, 1980Publicati…
This paper describes an investigation into the growth of electrical trees in polyethylene by the simultaneous measurement of light intensity and partial discharges. The emission of light has been studied using an image intensifier. A comparison of the results obtained for different types of trees has been made. The de…
Abstract Neue Farbstoffe wurden synthetisiert, die ein ionenselektives Kronenethersystem enthalten, bei dessen Komplexierung mit Kationen der Chromophor im Grund‐ und angeregten Zustand elektronisch unterschiedlich beeinflußt wird. Verschiedene Ionentypen rufen verschiedene Farbänderungen hervor. Außer cyclischen Kron…
Abstract Rheological studies were carried out on concentrated m ‐cresol solutions of two helical synthetic polypeptides; poly‐γ‐benzyl‐ L ‐glutamate (PBLG; molecular weight, 150,000) and poly‐ϵ‐carbobenzyloxy‐ L ‐lysine (PCBZL; molecular weight, 200,000). Steady shear measurements were made over a range of 0.01–16,000…
Abstract The spectra of thermally stimulated luminescence caused by the recombination of mobile V K centres, V F centres, and X centre decay products with F centres are studied at temperatures from 80 to 500 K for KCl, KCl:Sr, KBr, and KBr:Sr crystals X‐irradiated at 80 or 295 K. The recombination processes occurring…
A BASrc program package has been developed for the quantitative interpretation of digitally recorded X-ray ditrractometric data of bauxites. It corrects for background, searches the peaks, and calculates the integrated intensities. Information stored in the phase library permits the identification of the components an…
It is shown that in FeTiD 0.057 ( alpha phase), deuterium occupies octahedral sites with iron atoms as nearest neighbours.
Abstract Intensities of a 1 Δ g ← X 3 ∑ g − and b 1 ∑ g + ← X 3 ∑ g − transitions in molecular oxygen have been calculated on the basis of the INDO method taking into account spin‐orbit coupling by perturbation theory. The transitions are magnetic dipole in nature. The first of them ( a − X ) steals its intensity from…
<div class="htmlview paragraph">Combustion and gasification characteristics of deposits from diesel exhaust were investigated. Properties which may influence soot reactivity, such as morphology, specific surface area, organic adsorbate, and occlusions of inorganic origin were characterized. Effects of temperatur…
Abstract The thermal decomposition of HMX has been investigated using thermoanalytical techniques and infrared spectroscopic study at both above and below its melting point. The weight loss phenomenon that occurs as the temperature is elevated at a constant heating rate has been clearly separated into four elementary…
As a means of assessing the extent to which deformation of isolated walls relates to in vivo cell expansion, the directionality of wall mechanical properties was examined in Nitella. Measurements were made of plastic and elastic deformation and creep under both uniaxial and multiaxial stress conditions. Walls of diffe…
Experimental determinations of the mineral/liquid partition coefficients of REE (La, Sm, Eu, Gd, Tb, Yb and Lu), Sc and Sr are reported for the minerals perovskite, spinel and melilite in synthetic systems. Perovskite concentrates light REE with respect to the residual liquid but shows no preference for heavy REE. Spi…
The crystal structures of the intercalation compounds of Li x TiS 2 are investigated by neutron diffraction for x = 0.12, 0.33, 0.67, and 1.0. The Li atoms are shown to preferentially occupy the octahedral sites in the van der Waals gaps of the host TiS 2 lattice for all values of x and no evidence for three-dimension…
Abstract Mean free paths for inelastic scattering (λ) of low energy electrons in poly(methylmethacrylate) (PMMA) have been determined by measuring Al Kα excited C 1s and Si 2s photoelectron signal intensities as a function of ellipsometrically determined thicknesses of PMMA overlayers on silicon substrates. The λ valu…
Effects of electrolytic bubbles on the IR drop of caustic soda solution in a vertical cell of one meter height were studied under both free and forced convection. Three pairs of Luggin‐Haber probes were positioned near the anode and the cathode to determine the solution IR drop during electrolysis. A sectioned electro…
High pressures were generated using a diamond indentor technique. The phase transition in silicon loaded in the [100] direction and silicon loaded in the [111] direction under high pressure was studied. From the behavior of electrical resistance of silicon loaded in the [100] direction, it was found that it becomes me…
Abstract The morphology of poly(butylene terephthalate) (PBT) crystallized from the melt at various temperatures was studied by small‐angle light scattering, polarizing microscopy, and wide‐angle x‐ray diffraction. Spherulites with a maltese cross at 45° to the polars formed at lower temperatures while spherulites hav…
The glass-forming region was determined for the system Ge-Bi-Se; 13 at.% Bi was found to be incorporated at its maximum content into glasses, the Ge content of which was 20 at.%. Electrical resistivity, thermoelectric power, and optical absorption coefficient were measured mainly on a series of Ge20BixSe80−x glasses (…
Abstract Investigations of morphological changes which are induced in segmented elastomers by annealing and quenching are reported. Four different polymers were studied each based on the same soft segment—1000 or 2000 molecular weight poly(tetramethylene oxide). The hard segments were 4,4′‐diphenylmethane diisocyanate…