Materials Literature
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Passivating films were grown on gallium arsenide by direct nitridation with hydrazine at 300–400 °C. Auger electron spectroscopy and x-ray photoelectron spectroscopy analysis show that the films are primarily gallium nitride with an oxide impurity. The oxide content is a function of the surface pretreatment, reaction…
We review mixing and phase separation (demixing) in mixtures of low molecular weight liquid crystals (LCs) and organic matrices, with emphasis on aspects relevant to the formation of polymer-dispersed liquid crystal films. These films, which contain a myriad of micron-sized LC droplets, are of interest because of thei…
A formalism is presented for determining the magnetoelastic (ME) coefficients of tetragonally distorted surfaces and thin films. The equation of motion of the magnetization is determined from free-energy-density expressions containing terms for crystalline and shape anisotropy, ME anisotropy, and applied field. Canoni…
A symmetric phase-field model is used to study directional solidification in two and three dimensions. Numerical evidence of tip-splitting, breathing modes, solitary modes, and other non-steady-state behavior is seen in 2D. A simple model for the breathing modes is proposed. Finally, 3D simulations indicate a hexagona…
The dc electrical conductivity (\ensuremath{\sigma}) of activated carbon fibers (ACF's) heat treated at temperatures (${\mathit{T}}_{\mathrm{HT}}$) ranging from 300 to 2500 \ifmmode^\circ\else\textdegree\fi{}C has been measured from 4.2 K to room temperature, and the magnetoresistance of these same fibers has been mea…
Using the x-ray excited optical luminescence technique, we have investigated the soft x-ray induced photoluminescence of porous silicon in the optical region (200–900 nm) and the Si K-edge x-ray absorption fine structures of porous silicon in the near edge region. It is found that while porous silicon prepared at low…
The predicted amino acid sequence encoded by the open reading frame 221 (orf221) of bacteriophage lambda exhibited a high degree of similarity to the catalytic subunits of a variety of protein serine/threonine phosphatases belonging to PP1, PP2A, and PP2B groups. Cloning and expression of the orf221 gene in Escherichi…
A method is proposed to control the wavelength of visible photoluminescence (PL) from porous silicon (PS). This is based on the post-anodization illumination technique which employs a filtered light with various maximum cutoff photon energies. As the illumination time increases, the PL spectra shift toward the higher…
Abstract Mechanical and Morphological properties of polyamide‐6/ABS blend systems, compatibilized by styrene‐maleic anhydride (SMA) copolymer, have been studied. The strength, modulus, and impact properties improved upon the addition of SMA. Morphological studies, using small angle light scattering, polarizing microsc…
Copper films have been deposited by low pressure chemical vapor deposition from mixtures of the Cu+1 precursor copper hexafluoroacetylacetonate vinyltrimethylsilane and water vapor. The addition of water vapor at the optimum concentration more than doubles the deposition rate and substantially reduces the nucleation t…
Nanocrystalline BaTiO3 thin-layer capacitors were integrated onto silicon by sol-gel processing using alkoxide precursor solutions. 200-nm-thick layers were formed and found to be comprised of 25-nm grains in the cubic perovskite structure. Electrical measurements indicated a lack of polarization-reversal hysteresis c…
Abstract Thermooxidative degradation of thick‐walled rubber materials is dependent on oxygen diffusion. The oxidative degradation ceases due to a lower permeability of oxygen through the oxidized material formed at the rubber surface. This phenomenon indicates a paradoxical effect of antioxidant loading. Since antioxi…
Lead(II) oxalate dihydrate, PbC 2 O 4 .2H 2 O, has a polymeric structure. The channels formed by Pb 2+ and oxalate ions are elongated along [001]. Within the channels there are water molecules of two sorts: (a) water weakly coordinated to lead ions and (b) water of crystallization
Although Debye's relaxation model has been extensively used in analyzing experimental data of dielectric dispersion and absorption, the model has a fault to violate the sum rule for dielectric function. A simple and tractable modification to Debye's model is proposed which is free from the above-mentioned fault. The r…
Michael Rezsutek, Guy N. Cameron; Mormoops megalophylla, Mammalian Species, Issue 448, 15 November 1993, Pages 1–5, https://doi.org/10.2307/3504289
Quantitative low-energy electron-diffraction (LEED) IV spectra analyses of Ag, Li, and metastable clean (\ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 )R30 \ifmmode^\circ\else\textdegree\fi{} Si(111) reveal that striking similarities in the LEED spectra are due to common scattering blocks…
Reconstructed surfaces on Sb/GaAs(001) have been investigated in situ by reflection high-energy electron diffraction (RHEED) and core-level photoelectron spectroscopy by heating a sample prepared by depositing Sb on an As-terminated GaAs(001) surface at room temperature (RT). Before Sb desorption, the halo RHEED patte…
Melts of Ag, Cu, and four different Ag-Cu alloys, including the eutectic composition, with masses between 1 and 2.5 g were undercooled by the glass flux method, and the temperature of the specimen was measured with a pyrometer during cooling and recalescence. For each composition the maximum recalescence rate was dete…
The local structural order in chalcogenide network glasses is known to change markedly at two critical compositions, namely, the percolation and chemical thresholds. In the ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glassy system, both the thresholds coincide at the composition…
Detailed computer simulation results of several static and dynamical properties of water, obtained by using a realistic potential model proposed by Jorgensen et al., in the supercooled region, at densities well below the coexistence curve, are reported. We have analyzed the structural properties by evaluating the volu…