Materials Literature
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Lattice constants and bulk moduli of eleven cubic III-V semiconductors are calculated using an ab initio scheme. Correlation contributions of the valence electrons, in particular, are determined using increments for localized bonds and for pairs and triples of such bonds; individual increments, in turn, are evaluated…
A model has been developed which describes the process of substrate-temperature-dependent diamond film growth. Detailed calculations were performed for the dependence of the diamond growth rate on the substrate temperature and the flux ration of hydrogen- and carbon-containing species above the surface. The theoretica…
In this letter, we report the results of copper-doped porous silicon. In the photoluminescence spectrum of porous silicon without Cu doping, only one red luminescence band appears with a peak at 676.5 nm; while in the photoluminescence spectrum of Cu-doped porous silicon, red and near infrared luminescence bands appea…
Controlled slow-speed microcutting tests were made on single crystal silicon. Micro-Raman spectroscopy confirmed the presence of amorphous silicon within the microcutting grooves as well as in the debris particles removed from the grooves. These results indicate that pressure-induced transformation to metallic silicon…
The observation of an incommensurate diffraction pattern in urea inclusion compounds by neutron diffraction is reported. It reveals for the first time in these compounds the existence of all kinds of reflections expected for an intermodulated composite. The superspace analysis together with the temperature evolution o…
The principles of operation of a microelectromechanical (MEMS)-based magnetometer designed on the magnetoelastic effect are described. The active transduction element is a commercial (001) silicon microcantilever coated with an amorphous thin film of the giant magnetostrictive alloy Terfenol-D [(Dy0.7Te0.3)Fe2]. In ad…
A computer simulation of amorphous ${\mathrm{SiO}}_{2}$, with a potential which includes formal ionic charges and an explicit account of polarization effects, produces a calculated infrared spectrum in good agreement with experiment. The polarization effects play a crucial role in reproducing the observed network vibr…
Dendritic crystal growth in a pure undercooled melt is simulated quantitatively in three dimensions using a phase-field approach. The classic parameter ${\ensuremath{\sigma}}^{*}$ that characterizes the dynamically selected operating state of the dendrite tip as well as the full nonaxisymmetric tip morphology are dete…
A rigorous connection is established between the local porosity entropy introduced by Boger et al. (Physica A 187, 55 (1992)) and the configurational entropy of Andraud et al. (Physica A 207, 208 (1994)). These entropies were introduced as morphological descriptors derived from local volume fluctuations in arbitrary c…
The domain size and the ac-hysteresis of NiZn-ferrites have been investigated as a function of grain size. It is found that the ac-hysteresis or energy dissipation at MHz frequencies is substantially reduced in fine-grained, monodomain NiZn-ferrites, which is attributed to the absence of intragranular domain walls.
Microfibrillated cellulose (MFC)-collagen composite films were prepared with a dispersion of acid swollen collagen fibers and carboxylated MFC at different ratios in an alkaline homogenous system. The surface topographic results obtained from SEM analyses indicated that the MFC entangled uniformly with collagen in the…
Crosslinked high-density polyethylene piping is currently in use for carrying pressurized hot water, chemicals, and waste. Hot and cold drawing processes, above and below melting, were studied and compared aiming at improving the pipe's toughness, strength, and creep resistance. Initially, the tensile behavior as func…
Abstract This paper reviews experimental studies on the magnetophotoluminescence in diluted magnetic semiconductors Cd 1−x Mn x Se with x = 0.01, 0.05, 0.10, and 0.25 and Cd 1−x Co x Se with x = 0.012 at 1.4 and 4.2 K under hydrostatic pressures up to 2 GPa. The studies focus attention to the pressure dependence of th…
The study of residual stresses in metallic superlattices is of great importance. Properties of these materials are a consequence of their extreme strain states. With respect to single films, both the determination methods and the magnitude of the stresses may differ in multilayers. X-ray strain determination must be u…
A model of translational diffusion in the nematic phase is proposed. The generalized free-volume approach is used to evaluate the diffusion coefficient of a small hard-sphere tracer among monodisperse rodlike particles interacting via the Warner nematic potential. The free volume of the sample is visualized as a syste…
Measurements of the electrical conductivity and thermoelectric power of CuInTe2 in the temperature range from 400°C to 970°C shows that the thermoelectric power changes sign from positive in the solid state to negative in the liquid state above its melting point. The experimental data were explained on the basis of a…
Thin, nonporous films of bismuth ruthenium oxide having the pyrochlore crystal structure were prepared by ion beam deposition. The films were grown on metal disks machined to fit into a rotating ring‐disk electrode. The electrocatalytic properties of these films for O 2 reduction and evolution were studied in 1 M KOH…
Myosin light-chain kinase is responsible for the phosphorylation of myosin in smooth muscle cells. In some tissue types, the C-terminal portion of this large enzyme is expressed as an independent protein and has been given the name telokin. Recently, an antibody directed against telokin was found to interact with a pr…
A numerical algorithm is presented for analyzing plane‐wave diffraction by a doubly periodic grating whose surface profile is corrugated periodically in two directions. The algorithm is based on the Yasuura method: diffracted fields are expanded in terms of Floquet modes for doubly periodic structures, and the expansi…
When the gamma dose rate around an irradiated nuclear reactor fuel element is calculated, it is important to know the attenuating characteristics of the fuel element itself one of them being the buildup factor. Exposure buildup factors of uranium dioxide (UO2) for ten gamma-ray energies (0.050 to 10.0 MeV) have been c…