Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Room-temperature capacitance-voltage-frequency measurements are reported for an 85-nF barium titanate high-voltage ceramic-disk nonlinear capacitor, intended for use in a power electronics turnoff snubber circuit. Bias-voltage excursions are from 0 to 1500 V DC, and the frequency responses are measured from quasi-DC t…
Abstract 1‐Alkenes are converted in high yields to the corresponding primary diorganomagnesium compounds by transition metalcatalyzed hydromagnesation reaction using catalytically prepared suspended (MgH 2 *) or dissolved magnesium hydride (MgH 2 * ). The most active hydromagnesation catalysts have been found to be co…
A SiC-on-SiO/sub 2/ waveguide structure is proposed and analyzed. The analysis shows that the planar SiC waveguide has low loss and good beam confinement in the guiding core for the fundamental mode at 1.3 mu m and 0.7 mu m. In addition, such a waveguide displays strong mode discrimination (>20 dB) between the fundame…
Beam-profile reflectometry is a new technique for measuring the thickness and optical constants of dielectric, semiconducting, and thin metal films. The technique consists of measuring the intensity profile of a highly focused beam reflected from the sample. By using a linearly polarized light source and a tightly foc…
Abstract A dispersion-centrifugation-decantation procedure was used to isolate various particle size fractions from a sample of clay (<2 µ m fraction) separated by sedimentation from the Ap horizon of a Webster soil (fine-loamy, mixed, mesic Typic Haplaquoll). The 0.02–0.06 µ m size fraction was found to be enriche…
Abstract With the exception of most PVC pressure pipe and a few profile applications where high modulus is the major consideration, most rigid and semirigid PVC compounds have impact performance requirements that can be met only through the use of impact modifiers. We present an overview of the mechanisms of impact mo…
Abstract A series of dinuclear manganese(II) complexes [R1-LMn2(R2CO2)]ClO4 were synthesized and X-ray crystal structure analysis of [CH3-LMn2(CH3CO2)]ClO4 (1) was performed. Two manganese ions of 1 were six-coordinate with highly deformed octahedral structure. Electrochemical measurements of these complexes revealed…
The reaction of trans-RuCl2(dppe)2 (1), with AgBF4 in tetrahydrofuran leads to abstraction of one of the halide ligands to produce the trigonal-bipyrimidal complex, [RuCl(dppe)2]BF4 (2). Both products are characterized by 31P NMR spectroscopy and their crystal structures determined. For the coordinatively unsaturated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox-switched vesicle formation from two novel, structurally distinct metalloamphiphilesServando Munoz and George W. GokelCite this: J. Am. Chem. Soc. 1993, 115, 11, 4899–4900Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissu…
Compounds with the formula ${\mathit{R}}_{2}$BaM${\mathrm{O}}_{5}$ where R=rare earth and M=Co, Ni, or Cu, have been studied with Raman spectroscopy. The lattice dynamics of the three different crystallographic phases adopted by these systems (space groups Immm, Pnma, and P4/mbm) is discussed in relation to the transi…
The critical behavior of Lifshitz points in systems with short range and uniaxial dipolar interaction is calculated. These multicritical points belong to a new universality class and may be relevant in the phase diagram of ${\mathrm{Sn}}_{2}$${\mathrm{P}}_{2}$(${\mathrm{Se}}_{\mathit{x}}$${\mathrm{S}}_{1\mathrm{\ensur…
Parameters of heat denaturation and intrinsic fluorescence of barnase and its close homologue, binase in the pH region 2-6 have been determined. The barnase heat denaturation (pH 2.8-5.5) proceeds according to the "all-or-none" principle. Barnase denaturation temperature is lower than that of binase and this differenc…
A series of thin films were formed on Pt by an MOCVD technique using Fe(III), Cr(III), and Ni(II) acetylacetonate. The corrosion resistance of the films was examined in and by measuring the film thickness using ellipsometry and the chemical analysis of test solutions with ICPS. The dissolution rate of composite films…
Abstract During processing of Athabasca oil sands, the finely divided solids form an aqueous suspension, which ultimately stabilizes as a gel-like structure retaining up to 90% of the process water. This gelling phenomenon is believed to be caused by colloidal inorganic components. Kaolinite and mica are the main crys…
The complexity of the semiconductor-dielectric system behavior under high electric fields is discussed. Time dependence of the voltage drop, electrical current, and light emissions, and the strong influence of the nature and quality of the surrounding dielectric, as well as the quality of the semiconductor processing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of mono- and diperoxovanadates with peptides containing functionalized side chainsJaswinder S. Jaswal and Alan S. TraceyCite this: J. Am. Chem. Soc. 1993, 115, 13, 5600–5607Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalytical-scale supercritical fluid extraction of aflatoxin B1 from field-inoculated cornScott L. Taylor, Jerry W. King, John L. Richard, and Judith I. GreerCite this: J. Agric. Food Chem. 1993, 41, 6, 910–913Publication Date (Print):June 1, 1993Publication History Publishe…
In directional solidification of alloys, the interface pattern assumes a cellular structure, with a periodic array of cells, when the velocity is increased beyond the threshold of planar interface instability. A detailed experimental study in the succinonitrile-acetone system has revealed a branch of cellular structur…
Abstract Results of a study of the orientation characteristics of extruded poly(ethylene terephthalate) (PET) (Homopolymer) sheets are discussed with respect to stretching condition. PET exhibits strain‐induced crystallization upon being stretched to large extension ratios. This may lead to strain‐hardening, which is…
BaTiO 3 ceramics doped with La (0.01–0.84 at.%) were prepared only with the addition of La and stoichiometric TiO 2 . As a result, even when BaTiO 3 was doped with 0.53 at.% La, it could be converted to a semiconductor by sintering at 1540°C for 2 h in air and cooled slowly in the furnace. Differential thermal analysi…