Materials Literature
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Poly-quasicrystalline samples of an icosahedral Al-Cu-Fe alloy have been deformed in compression tests under constant-strain-rate conditions at temperatures ranging from room temperature up to 1020 K (T m ≈ 1150 K, where T m is the melting temperature). The activation volumes, which were measured by performing load re…
Abstract Removal of SO 2 from the emissions of coal‐fired boilers produces by‐products that often consist of CaSO 4 , residual alkalinity, and coalash. These by‐products could be beneficial to acidic soils because of their alkalinity and the ability of gypsum (CaSO 4 ·2H 2 O) to reduce AI toxicity in acidic subsoils.…
1.1. Homogenization and Second Grade Media. The aim of homogenization methods is to replace a heterogenous material by a homogenous equivalent one endowed with effective properties. The now well-established results of classical homogenization theory [15] are generally based on the assumption of constant mean fields [1…
The structure of MO-TeO2 (M=Mg, Zn, Sr, Ba and Pb) glasses has been studied by means of 125Te static NMR technique. The fraction of TeO4 trigonal bipyramid (tbp), N4 decreased and that of TeO3 trigonal pyramid (tp), N3 increased almost linearly up to 33.3mol% MO and rapidly in the range of 33.3 to 40mol% MO, with incr…
Oxygen surface exchange was measured for Y 0.2 Ce 0.8 O 2 − x (YDC) and Y 0.15 Zr 0.85 O 2 − y (YSZ) over a wide range of oxygen partial pressures ( 7.3 × 10 − 21 to 0.17 bar ) by isotope oxygen exchange ( 18 O / 16 O ) using secondary‐ion mass spectrometry analysis at 973 K . Diffusion depth profiles of 18 O in YDC a…
Tetraalkyl and dialkyl derivatives, where alkyl=ethyl and propyl, of the organic electron donor molecule bis(ethylenedithio)tetrathiafulvalene, BEDT-TTF or ET, have been synthesized via the Diels-Alder approach. Several cation-radical salts of these new donors have been prepared and structurally characterized, and fou…
Pb 2 MgWO 6 is an ordered perovskite or elpasolite that undergoes a phase transition from a cubic paraelectric phase to an orthorhombic antiferroelectric phase below 310 K. Through an analysis of the electronic structures of both the high and low temperature phases using high level band structure methods, the nature o…
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Addition of a suspension of exfoliated titanate nanosheets into an Al13 pillaring solution produced a novel pillared structure associated with double layers of Al13 cations, which can be converted to a mesoporous alumina-pillared titanate with a 2.4 nm spacing by subsequent heat-treatment.
"In-situ" real time observation of the ferrite nucleation at nonmetallic inclusions has been successfully made at elevated temperatures with a confocal scanning laser microscope. The nucleation site, nucleation temperature, and/morphological change of the precipitates and ferrite can be sequentially determined as the…
Porous vanadium oxide materials were prepared by electrochemical deposition in the presence of surfactants. Both scanning electron microscopy and ac impedance results indicated a large increase in surface area compared with a sample prepared without surfactants. X‐ray diffraction and infrared spectroscopy results indi…
Article Revisiting the Complexity of Finding Globally Minimum Energy Configurations in Atomic Clusters was published on January 1, 1999 in the journal Zeitschrift für Physikalische Chemie (volume 211, issue 1).
Si nanocrystallites embedded in a silica matrix have been prepared by the sol-gel route using triethoxysilane as the precursor. The different steps of formation of silicon during thermal treatment of the gels were observed by X-ray diffraction, Raman and 29 Si MAS NMR spectroscopy. The gels were first pre-heat-treated…
The new podand ligand hydrotris[3-(6-methyl)pyridin-2-ylpyrazol-1-yl]borate [L1]– was prepared which contains three bidentate pyrazolyl/pyridine arms attached to a {BH}– head-group. This ligand differs from an earlier ligand hydrotris[3-(2-pyridyl)pyrazol-1-yl]borate [L2]– by the presence of methyl groups attached to…
The photoexcited triplet state of free-base porphycene randomly oriented in a glassy toluene matrix has been investigated by time-resolved electron paramagnetic resonance and electron spin echo spectroscopy over the temperature range 4–100 K. Spectral broadening and anisotropic relaxation are both observed as the temp…
Summary The influence of acetone, as a solvent on crystalline structure of the cellulose, was investigated. Crystalline changes brought about by the solvent treatment on the residual cellulose have been foundto be noticable. The crystallinity index of solvent treated celluloses has shown a trend of a small gradual inc…
A method is described for generating and displaying woven-fabric structures in three dimensions by computer graphics. The thread paths displayed are generated by using cubic B-splines, the mathematics of which is well developed, mainly for other areas of engineering design, especially in aerospace engineering. Some re…
The placement of simple saccharides within the micropores of the cell wall of never-dried pulp fibers to create a cellulose substitute is proposed as a means of reducing the fiber content, and hence the cost, of paper. The nature of the interaction between entombed monosaccharides, disaccharides, disaccharides, and tr…
Dramatic effects of chitin and chitosan on wound healing were demonstrated in field cases of many small animals (dogs and cats), food animals (338 cows) and 142 zoo animals. In comparison with conventional therapy with irrigation and antibiotic administration to wound, new treatment with chitin and chitosan permitted…
An accurate measure of the maturity of a sample of cotton is essential for assessing the quality of the fiber. Work has begun to produce large quantities of diverse cottons with well-defined values of fineness and maturity. The reference method for measuring fiber maturity based microscopic image analysis of thin sect…