Materials Literature
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We have used low-temperature silicon molecular beam epitaxy to grow a δ-doped silicon layer on a fully processed charge-coupled device (CCD). The measured quantum efficiency of the δ-doped backside-thinned EG&G Reticon CCD is in agreement with the reflection limit for light incident on the back surface in the spec…
A theoretical characterization of the guided-mode resonance properties of planar dielectric waveguide gratings is presented. Efficient exchange of energy between forward and backward propagating diffracted waves is shown to be possible with smooth line shapes. The linewidths of the resonances can be controlled by the…
Abstract A plasticity theory is proposed in which the yield strength not only depends on an equivalent plastic strain measure (hardening parameter), but also on the Laplacian thereof. The consistency condition now results in a differential equation instead of an algebraic equation as in conventional plasticity. To pro…
Abstract The activity of an enzyme may be measured by determining the rate of product formation or substrate used during the enzyme-catalysed reaction. For many enzymes there are several alternative assay procedures available and the choice between them may be made on the grounds of convenience, cost, the availability…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract The thermotropic liquid crystalline behaviors of ethylcellullose (EC) were investigated by DSC, polarizing microscope with hot stage, and capillary rheometer. It was found that only those EC that have the ethoxyl content over 45% can exhibit the thermotropic liquid crystalline behaviors: the DSC trace showed…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract The change of mechanical properties was followed during thermal aging at 85, 95, 105, and 120°C of the 10 PVC–didecylphthalate extrudates studied in the first part of this paper, but also of four new samples differing only by the plasticizer concentration. For these latter samples, the change of dielectric pr…
Abstract Weight‐loss kinetics were studied for 10 industrial extruded samples of poly(vinyl chloride) (PVC) plasticized by 20–30% by weight of didecylphtalate at 85, 95, 105, 110, and 120deg;C. For the most unstable samples, which contained a light coplasticizer, the weight‐loss rate obeyed Fick's law. In the other ca…
The GaP(001) surface treated by H2S has been studied using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), and x-ray photoelectron spectroscopy (XPS). We, for the first time, find the new surface structure, S/GaP(001)-(1×2), obtained by H2S treatment at 450 °C. The coverage of sulfur is esti…
Heteroepitaxial growth of (001) Al thin films on Si (111) single crystal substrates by vapor deposition was studied by means of x-ray diffraction, Rutherford backscattering spectrometry, and transmission electron microscopy techniques. It was observed that the films deposited at room temperature exhibit random (111) t…
Crystals of KTiOAsO4 were grown by the high temperature solution method and their optical and ionic conductivity properties evaluated. The band edge and IR cutoff were 370 and 4850 nm, respectively. A domain structure prevented efficient frequency conversion in as-grown crystals. The ionic conductivity at 22 °C and 12…
On the surface of a brine-surfactant (AOT) mixture, the long-chain alkanes (N>11) do not spread while the shorter ones (N11) spread leaving a very thin oil film at the surface. The interactions between the oil-water and oil-air interfaces stabilizing the height of this film are a van der Waals attractive potential,…
We show that first-principles electronic structure calculations of silicon wires with diameters up to \ensuremath{\sim}1.5 nm support the idea that quantum confinement and surface effects are responsible for the luminescence in porous silicon. Instead of the indirect gap of crystalline bulk silicon, the band structure…
We have performed first-principles pseudopotential calculations for H-terminated Si wires with thicknesses from 12 to 23 \AA{}, calculating the band gaps and optical matrix elements. Comparison with effective-mass theory shows that the latter is valid for wires wider than 23 \AA{}. We have used our data to analyze the…
The clocklike emission of picosecond pulses of light with a peak power over 30 mW has been observed to originate from a bubble trapped at the velocity node of a resonant sound field in water. The spectrum of this bright sonoluminescence is broadband and our measurements show that if a spectral peak exists, it lies at…
To improve the stability of porous Si (PS) prepared by electrochemical etching, we make use of rapid-thermal oxidation (RTO). During RTO processing, the hydride coverage of the internal surfaces of the pores is replaced by a high-quality oxide while retaining nm-sized Si grains. With increasing process temperature Tox…
A simple density functional theory (DFT) is applied to an analysis of the isotropic, nematic and smectic-A phase transitions in single component systems comprised of hard convex bodies. In the chosen DFT, the exact orientation dependent second virial coefficient is used together with an approximation due to Parsons wh…
Abstract The intramolecular (internal) charge sensitivity analysis ( ICSA ) is presented in the molecular orbital ( MO ) resolution, with diagonal idempotency constraints being imposed on the MO occupations, n , which can then be considered as independent electron population variables of the system for the assumed fix…
Tire de :'AIAA 4th International Aerospace Planes Conference', Orlando, FL (USA), December 1-4, 1992