Materials Literature
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We demonstrate a spherical diffractive lens fabricated in fused quartz for use at the 632.8-nm wavelength. The lens is constructed by use of a modulated two-dimensional binary grating with a high transmitted zerothorder efficiency. Rigorous eigenmode analysis is used to correlate the desired phase modulation with the…
Melt-textured (Y123) containing fine particles of (Y211) has been prepared from Y123/Y211 powder that was attrition milled with 1 wt% addition, and the microstructure has been examined. Fine and spherical Y211 particles (less than 1 m in size) are found to be homogeneously dispersed within the melt-textured Y123 domai…
Two types of novel aromatic copolyesters were synthesized from 11-phenoxyundecanoic acid (11-POU) as the sole carbon source and the cosubstrates 11-POU and octanoate, respectively, by isolated Pseudomonas putida BM01 that is known to accumulate high concentrations of medium-chain-length polyesters. Insoluble 11-POU wa…
A new technique for synthesizing small batches of oxide-based ceramic and glass materials from high purity powders is described. The method uses continuous wave CO2 laser beam heating of material held on a water-cooled copper hearth. Contamination which would normally result during crucible melting is eliminated. Deta…
The local magnetic moments and hyperfine fields, the intersublattice exchange fields, the electric field gradients, and the crystal field parameters are calculated for the technologically important hard-magnetic compound ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B by the full-potential linear-muffin-tin-orbital method in…
Lamivudine can be obtained as acicular crystals (form I, 0.2 hydrate) from water or methanol and as bipyramidal crystals (form II, nonsolvated) from many nonaqueous solvents. Form II is thermodynamically favored in the solid state (higher melting point and greater density than form I) at ambient relative humidities. S…
Abstract Blends of polypropylene (PP), the triblock copolymer polystyrene‐ block ‐poly(ethylene‐ stat ‐butylene)‐ block ‐polystyrene (SEBS), and processing oil were found to form thermoplastic interpenetrating polymer network (IPN) structures in a composition range from about 10 to 55% by weight polypropylene. The IPN…
The temperature dependence of the dc conductivity of electrochemically polymerized films of polypyrrole, poly(N-methyl pyrrole) and their copolymers, poly(N-methyl pyrrole-pyrrole), having different percentage of BF−4 ions has been investigated in the temperature range 77–350 K. The observed behavior could be explaine…
Abstract Helvetic sediments from the northern margin of the Alps in eastern Switzerland were studied by clay mineralogical methods. Based on illite “crystallinity” (Kübier index), the study area is divided into diagenetic zone, anchizone and epizone. Data on the regional distribution of the following index minerals ar…
Aims to evaluate the effectiveness of 2‐amino 4‐phenyl thiazde (APT) and its three anils as inhibitors for the corrosion of mild steel in 1M HCl. Discusses the variation of inhibition efficiency with temperature. Gives account of experimental procedures on mild steel strips for weight loss measurements and potentiodyn…
The anodic polarization behavior of copper in 1 M NaI at ∼24°C was compared with calculations based on thermodynamic equilibria and shown to be consistent with the potential‐pH diagram for the system. An active region was predicted and observed where cuprous complexes, , are formed. The active region exhibited a Tafel…
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…