Materials Literature
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Freshly produced red, yellow and green emitting porous Si specimens have been studied by NEXAFS and EXAFS (near edge and extended x-ray absorption fine structure). The emission peaks are at 690, 580, and 520 nm, which almost covers the full visible range that direct anodization can achieve. The correlation between the…
The electrochemical behavior of hydrated manganese‐substituted nickel hydroxides in Ni/Cd cells was studied. Partial substitution of manganese for nickel was shown to induce stabilization of the discharge capacity during long‐term cycling. Such behavior is related to the very small discrepancy between the interslab di…
The influence of a glass matrix on the spheroidal and torsional vibrational modes of microcrystals embedded into the matrix is analyzed. The low-frequency Raman scattering data are used to show that the influence of the matrix on the frequencies of the acoustic phonons confined in the microcrystals is significant even…
The gene encoding the large subunit of the methylmalonyl-coenzyme A (CoA) mutase in Nocardia corallina (mutBNc) was cloned. A 4.3-kbp BamHI fragment containing almost the entire mutBNc was identified by Southern hybridization experiments employing a digoxigenin-labeled probe deduced from mutB of Streptomyces cinnamone…
Abstract The rhenium oxides Re 2 O 7 and ReO 3 react with hydrogen peroxide solutions yielding peroxo complexes that efficiently catalyze the oxidation of olefins, aromatics, and certain organometallic compounds. In contrast, related oxides of molybdenum (MoO 3 ) and vanadium (V 2 O 5 ) do not activate H 2 O 2 under c…
For the series R${\mathrm{Co}}_{5}$ (R=rare-earth atom) various parameters occurring in the two-sublattice model of rare-earth--transition-metal intermetallics (local magnetic moments, intersublattice exchange fields, crystal field parameters, as well as magnetic hyperfine fields and electric field gradients) are calc…
Other| February 01, 1996 Granitic melt viscosities; empirical and configurational entropy models for their calculation Don R. Baker Don R. Baker McGill University, Department of Earth and Planetary Sciences, Montreal, PQ, Canada Search for other works by this author on: GSW Google Scholar Author and Article Informatio…
A comparison between different simplified integral-breadth methods, often used in the Rietveld-refinement programs to calculate coherent domain size and lattice strain, is carried out. It is shown that systematic differences exist for both domain size and strain, when they simultaneously broaden diffraction lines. Amo…
Paracoccus denitrificans accumulated a polyester in its cells during growth on n-pentanol. The composition of the polyester varied during the cultivation: the level of the 3-hydroxyvalerate unit in the polyester increased, and eventually a homopolymeric poly(3-hydroxyvalerate) [P(3HV)] accumulated to an amount 22 to 2…
Sputtered tin-doped indium oxide (ITO) coatings were investigated by UV-visible spectroscopic ellipsometry at different angles of incidence. The results were fitted using a classical dispersion formula for the optical constants of ITO in a model structure with a compact homogeneous film and a top layer representing su…
Polarized single crystal absorption spectra and luminescence spectra of ${\mathrm{Cr}}^{4+}$-doped ${\mathrm{Ca}}_{2}$${\mathrm{GeO}}_{4}$ and ${\mathrm{Mg}}_{2}$${\mathrm{SiO}}_{4}$ are presented and discussed. The absorption spectra are analyzed using the angular overlap model (AOM). The agreement between the experi…
Experimental evidence is presented to verify the quantitative predictions of interfacial defect theory as applied to strain relief in epitaxial PbTiO3 thin films through the formation of 90° domains. Epitaxial PbTiO3 thin films grown by metal-organic chemical vapor deposition on MgO(001), SrTiO3(001), LaAlO3(001), and…
<div class="htmlview paragraph">The objective of this research was to obtain diesel particle size distributions from a 1988 and a 1991 diesel engine using three different fuels and two exhaust control technologies (a ceramic particle trap and an oxidation catalytic converter). The particle size distributions fro…
We have investigated the magnetic structure of an insulating lightly doped ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{MnO}}_{3}$ with x=0.04,0.125, and 0.17 with neutron scattering technique and bulk magnetization measurements. The magnetic structure of the x=0.04 sample…
The decrease in Young's modulus after mechanically loading particulate-filled composites serves as a measure of the fraction of debonded filler particles. For composites based on plasticized rubber and fine ammonium perchlorate these effects have been studied for various stresses and for both varying amounts and parti…
The foaming tendency of a 30 weight % solution of diethanolamine (DEA) in distilled water was measured over a temperature range of 20-85°C and a pressure range of 1-3 MPa in the presense of a number of contaminants including carboxylic acids, oils, 1-4 bis (2-hydroxyethyl) piperazine (HEP), methanol, iron sulphide, si…
Abstract We investigated the miscibility windows in the blends of poly(vinyl chloride) (PVC) with chemically modified styrene/acrylonitrile (SAN) copolymers such as α‐methyl styrene/acrylonitrile (α SAN), α‐methyl styrene/methacrylonitrile (MSMAN). The blends of PVC with α SAN were found to have the broader miscibilit…
Previous studies showed that residual compressive stresses induced by thermal tempering retarded the growth of surface cracks in bilayered porcelain disks. The objectives of the present study were: (1) to determine whether thermal tempering by air blasting reduces the length of cracks induced by microhardness indentat…
The annealing behaviour of an Al–6 wt-%Ni alloy containing a dispersion of second phase particles has been studied. It is shown that for a particle diameter of 0·3μm, annealing takes place by extended recovery. However, for a particle diameter of 1·7 μm, discontinuous recrystallisation occurs. The relationship between…
Abstract Die Verbindungen Rb 2 Mn 3 Se 4 , Cs 2 Mn 3 Se 4 , Rb 2 Mn 3 Te 4 und Cs 2 Mn 3 Te 4 wurden durch Umsetzungen von Alkalimetallcarbonaten mit Mangan oder Mangancarbonat und Chalkogen in einem mit Chalkogen beladenen Wasserstoffstrom erhalten. Kristallstrukturuntersuchungen ergaben, daß alle Verbindungen isotyp…