Materials Literature
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The domain configuration of 0.95Pb(Zn1/3Nb2/3)O3–0.05PbTiO3 single crystals was investigated as a function of the applied electric-field direction with respect to the crystallographic orientation. A normal ferroelectric domain structure, which was not observable in virgin crystals (not exposed to electric field), appe…
Four known compounds have been isolated from the aerial parts of the Brazilian medicinal plant Pariparoba (Pothomorphe umbellata). They were an alkaloid, a flavone, a dihydrocalcone, and a steroid. The chemical structures were established to be N-benzoylmescaline, wogonin, uvangoletin, and beta-sitosterol glucoside us…
Rare-earth-doped (Er−, Yb− and Er+ Yb-doped) silica glasses have been produced and characterized. Their spectroscopic properties have been assessed and optical amplification devices have been produced therefrom and characterized.
Abstract To obtain comprehensive knowledge of the interfacial effect on the impact performance of sisal fiber reinforced epoxy composites, the fiber surface was modified in different ways prior to compounding. By using a surface tensiometer and dynamic mechanical analyzer, interfacial interactions in the composites we…
Formation of nanocrystalline calcia from calcite has been studied in situ via transmission electron microscopy. The crystallographic transformation occurred via two mechanisms: the first is by distortion of the cleaved rhombohedron of calcite, formed by {104} planes in hexagonal coordinates, into a cube. This produced…
Abstract Boron nitride (BN) is an effective processing aid for the extrusion of polyethylenes. It postpones the onset of gross melt fracture to significantly high shear rates not previously attained with conventional fluoropolymers. However, BN particles containing relatively high amounts of boron oxide (B 2 O 3 ) do…
The PCR cloning strategy for type II polyhydroxyalkanoate (PHA) biosynthesis genes established previously for Pseudomonas was successfully applied to Burkholderia caryophylli strain AS 1.2741. The whole pha locus containing PHA synthase genes phaC1, phaC2 and PHA depolymerase gene phaZ was cloned. The complete open re…
Abstract In most documented occurrences, violarite (FeNi 2 S 4 ) occurs as a product of the supergene alteration of primary pentlandite or millerite. Earlier experimental phase relations studies predicted the possible existence of a stable violarite–pentlandite tie line, though there has been little field evidence sup…
Nitrogen-containing carbon nanotubes are synthesized using a gas-phase reaction. The synthesis of nitrogen-doped carbon nanotubes from 100 to 500 Å in diameter is accomplished through pyrolysis of acetonitrile (CH 3 CN) at a temperature of 800°C. Cobalt and nickel metallic particles formed upon thermal decomposition o…
The pressure swing adsorption (PSA) method, operating rapid desorption, has become applied to medium-massive air-component separation. In this study, with the aim of applying the PSA method to a hydrogen isotope separation process, the multi-component adsorption characteristics of H2-D2 or H2-HD-D2 on a synthetic zeol…
The electrical, magnetic, and transport properties of Cu-doped polycrystalline samples Sr2Fe1−xCuxMoO6 with ordered double perovskite structure have been investigated systematically. Analysis of the x-ray powder diffraction pattern based on the Rietveld analysis indicates that the substitution of Fe3+ ions by Cu2+ ion…
The dc conduction behavior of thin films of SrBi2Ta2O9 (SBT) has been investigated on the basis of space-charge limited current theory. The theory was generalized to account for the traps, which were inevitably present in this case. The relative percentage of trapped injected charge and the free injected charge was se…
During sliding, the grain-boundary (GB) energy depends on the atomic structures produced during relative translation of the two grains. The variation in the GB energy within the two-dimensional boundary unit cell (BUC) constitutes the GB-γ surface. Maxima in the slope of the γ surface determines the sliding resistance…
Mo 5 Si 3 ‐particle‐reinforced Si 3 N 4 ‐matrix composites were fabricated by sintering molybdenum‐solution‐infiltrated porous Si 3 N 4 . Fine Mo 5 Si 3 particles, with an average diameter of ∼0.13–0.17 μm, grew in situ from the reaction between MoO 3 and Si 3 N 4 in the grain boundary of the Si 3 N 4 . The Mo 5 Si 3…
During the past eight years, the authors have extensively studied the properties of linear homogeneous bianisotropic media. They have studied the Green's dyadics, the factorization of the Helmholtz determinant operator, the field and source decomposition, and plane-wave propagation in various classes of these media. W…
The effect of partial substitution of tungsten for molybdenum on the microstructure and corrosion resistance in 22Cr–5Ni–3Mo duplex stainless steel (DSS) has been investigated following aging heat treatments in a temperature range of 600-1000°C. Electrochemical tests were carried out for the evaluation of corrosion re…
Amorphous films in the system Al 2 O 3 –Y 2 O 3 were prepared by the rf sputtering method in the range of 0–76 mol% Y 2 O 3 , and their density, refractive index, and elastic constants were measured. All of the physical properties of the amorphous Al 2 O 3 –Y 2 O 3 films had a similar compositional dependence; that is…
Although there are many studies related to predicting the dimensions of knitted fabrics, there are no studies available about predicting the knitting machine used to produce the knit. Until now, the decision to select a knitting machine was made through experience, trial and error, or rough calculations. This study pr…
Smooth muscle cell proliferation plays a major role in the genesis of restenosis after angioplasty or vascular injury. Local delivery of agents capable of modulating vascular responses, have the potential to prevent restenosis. However, the development of injectable microspheres for sustained drug delivery to the arte…
The decomposition kinetics of poly(vinyl butyral) binder from barium titanate multilayer ceramic capacitors with platinum metal electrodes were analyzed by thermogravimetric analysis as a function of the heating rate. The activation energy and pre‐exponential factor for the decomposition kinetics were determined from…