Materials Literature
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The increasing application of SF6 as an insulating gas has led to many studies on SF6 decomposition in gas-insulated equipment. In the presence-of an electric arc, spark or corona, SF6 decomposes to a wide variety of chemically active products which possess completely different properties from SF6. The accumulation of…
Abstract Several clay-organic complexes were synthesized by placing quaternary ammonium cations on smectite by cation exchange. They were then examined for their ability to adsorb phenol and several of its chlorinated congeners. The organic cations used were: hexadecylpyridinium (HDPY + ), hexadecyltri-methyl ammonium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium morphology of block copolymer meltsTakao Ohta and Kyozi KawasakiCite this: Macromolecules 1986, 19, 10, 2621–2632Publication Date (Print):October 1, 1986Publication History Published online1 May 2002Published inissue 1 October 1986https://pubs.acs.org/doi/10.1021…
Low voltage scanning electron microscopy is an important part of microelectronic inspection technique. This makes it possible to examine devices without changing the electrical properties, and to examine nonconducting samples such as photoresist without the use of a surface metal layer. The secondary electron imaging…
A class of electrostatic lenses with extremely low spherical aberration is proposed. The axial potential distribution of these lenses has an asymmetric bell-shaped form with a lower potential on the image side. A lens with Cso∞/fo=0.51 is presented as an example. The maximum required electrode voltage is only five tim…
A twisted nematic liquid crystal cell with two transparent conductive substrates each of which has two metal terminals was studied. It was found that a circular or elliptical light-transmitting area (bright area) was formed in the, cell window by applying four kinds of voltage signals to each terminal. The light-trans…
A monomeric mutant lactose repressor protein (T-41), containing serine at position 282 in place of tyrosine [Schmitz, A., Schmeissner, U., Miller, J. H., & Lu, P. (1976) J. Biol. Chem. 251, 3359-3366], has been purified by a series of chromatographic and precipitation methods. The molecular weight of the mutant as det…
The urea-induced equilibrium unfolding transition of dihydrofolate reductase from Escherichia coli was monitored by UV difference, circular dichroism (CD), and fluorescence spectroscopy. Each of these data sets were well described by a two-state unfolding model involving only native and unfolded forms. The free energy…
Micromolar solutions of tryptophan synthase beta 2 dimer dissociate into monomers in the pressure range of 800-1600 bars as shown by studies of the spectral shift of the intrinsic fluorescence and of the fluorescence polarization of dansyl conjugates. At 25 degrees C the standard change in volume on dissociation (dV0)…
We report new x-ray scattering data on AlMn alloys. None of our samples are perfect quasicrystals; all have finite-width x-ray peaks. Specific preparation techniques lead to samples with peak widths which correlate strongly with ${G}_{\ensuremath{\perp}}$ (phason momentum). We show that the data are consistent with ei…
We describe a process for the formation of silicon-on-insulator structures by selective anodization of a buried p-type layer to form porous silicon which is then oxidized. A buried n-type layer ensures that the flow of the anodizing current, and hence the formation of the porous silicon layer, is directed laterally ra…
We present Monte Carlo simulations on systems of parallel spherocylinders with length-to-width ratios $\frac{L}{D}$ between 0.25 and 5. We have determined the solid-liquid coexistence points in these systems by computing the absolute free energy of the solid and fluid phases. In addition we find that for $\frac{L}{D}&…
In this paper, we discuss how quenched strains in phonon and phason variables and/or quenched dislocations can lead to peak broadening and distortion in quasicrystal diffraction patterns. We argue that high-resolution electron micrographs and observations of distortions in electron diffraction patterns indicate the pr…
The thermal expansion of the lattice constant of a GaP crystal was measured in the range 4.2-300K using the Bond method. The authors found a negative thermal expansion coefficient for GaP at low temperatures. They also calculated the Gruneisen parameter and this was negative below 50K. These experimental results do no…
A model for the 'discommensurate' structure of NbTe 4 is proposed based on the analysis of electron diffraction patterns. It is found that above the lock-in temperature, which is around 50K, the structure can be described either as deformation-modulated or as interface-modulated. Both approaches lead to the same model…
A microscopic theory of the electrical small-polaron (SP) conductivity of Fe 3 O 4 is presented taking into account the polaronic short-range order (SRO) due to intersite SP-SP interaction. The theory is based on a SP correlation model in the narrow-band limit. The concept of SRO and its role in explaining the equilib…
Random fibre fields can serve as mathematical models of irregular systems of dislocation lines. The pair-correlation function describes their variability and inner correlations. This paper presents the pair-correlation functions for various fibre field models. The curves and formulae can help to interpret empirical pa…
Full concentration series of tetragonal melilite-like Ca2−xNdxGa2+xSi1−xO7 single crystals with desordered structure are grown using Czochralski technique and their precies X-ray structural analysis is carried out. Intensity, absorption, and luminescence characteristics including orientational ones of Nd2+ ions in Ca2…
It is shown that the commonly used approximation for the no-loss angle-resolved photocurrent from solids in general violates the optical selection rules if the final-state inverse low-energy electron diffraction orbital is taken to be damped. The violations occur in the velocity formula, which is inconsistent with the…
Intrinsic and extrinsic plasmon loss effects are discussed based on the theory proposed by the present author, both for surface and bulk plasmon loss observed in XPS spectra from deep cores. Two types of the incident X-ray polarization are considered here; one is normal to the surface, another is parallel to it. The a…