Materials Literature
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We have investigated the recently reported discrepancy between theory and a new experiment [Palathingal et al., Phys. Rev. A 51, 2122 (1995)] for single-quantum annihilation of positrons with bound electrons. Fully relativistic calculations of total cross sections for the production and the annihilation of positrons i…
Mussels form byssal threads that can attach tenaciously to wet and irregular surfaces. The byssus consists of a fibrous collagenous core, and at least two types of polyphenolic proteins surround it. One of these proteins, designated Mgfp-1, coats the collagenous core; the other, designated Mgfp-2, is the major compone…
The use of modular neural network (MNN) for the recognition of partial discharge (PD) sources has been investigated. Three phase related quantities, the PD pulse counts, the average and maximum discharge magnitudes form the feature vector of a discharge signal. The MNN consists of 5 sub-networks with identical structu…
Electrical and thermal analysis of a 15 kV silicone rubber distribution insulator was made under contaminated surface conditions. The electric field on the insulator surface and in the surrounding area was determined by using the finite element method technique, while the temperature distribution along the insulator s…
Several derivatives of 2,3-dicyanopyrazine were prepared via the condensation of o-quinones with diaminomaleodinitrile. Benzo[f]quinoxaline-2,3-dinitrile was obtained from 1,2-naphthoquinone, and a series of isomeric, di-tert-butyl substituted 5,6-(9,10-phenanthro)-2,3-dicyanopyrazines were prepared from the correspon…
Starting from the Maxwell equations, we solve the problem of the diffraction of a plane wave by a grating of finite conductivity, assuming that the incident wave vector is not orthogonal to the grooves. We make use of the method of fictitious sources, and the diffraction problem is thus reduced to two canonical proble…
The problem of pollutant transfer in food from a polymer packaging made of a recycled film and a functional barrier is studied from a theoretical point of view. In the present case, the process is controlled by Fickian diffusion through the two films of the polymer packaging in perfect contact and by convection into t…
The Effects of non-ideal and nonhomogeneous mixing on barium sulfate precipitation in an MSMPR reactor were observed experimentally and analyzed theoretically. To generate nonhomogeneous mixing the unmixed feed streams were fed to the reactor at the same location (joint feeding mode) or a plug flow reactor was connect…
The magnetizations, magnetic susceptibilities, and specific heats of both stoichiometric and nonstoichiometric single crystals GdAs are measured at temperatures 1.7\ensuremath{\le}T\ensuremath{\le}300 K and magnetic fields 0\ensuremath{\le}H\ensuremath{\le}24 T. A systematic comparison between the magnetic behavior of…
${\mathrm{Tm}}^{3+}$ doped germanate, tellurite and heavy-metal fluoride glasses were prepared and their upconversion luminescence spectra were measured to investigate the effect of the host glass on the branching ratios, \ensuremath{\beta} of $^{1}$${\mathit{D}}_{2}$${\ensuremath{\rightarrow}}^{3}$${\mathit{H}}_{6}$…
The frequency response of the dielectric constant (∊r), dielectric loss (tanδ) and impedance (Z) of Potassium acid pthalate (KAP) single crystals, monitored along the polar axis, is characterised by the presence of strong mechanical resonances, in the 50-200 kHz region. The observed resonance behaviour, which is depen…
A possible candidate as an environmentally friendly nonwoven fabric is one that can be formed from the thermal calendering of a cotton/cellulose acetate blend. Our results focus on biodegradable properties of the fibers as well as tensile properties of the fabric. Cotton, which is a comfortable, absorbent, biodegradab…
The influences of various reaction parameters (e.g. temperature, time, type and concentration of polyol, and swelling agent) on the extent of liquefaction of the wood meal in polyol, and the properties of the liquefied wood-polyol mixtures have been evaluated. The residue % decreases significantly with the increase of…
Lithium oxide is a possible candidate for a breeder blanket material in fusion reactors. Tritium is generated in the material, which can be extracted and fed into the fusion reactor to help sustain the fusion reaction. Experimental studies have shown the extraction rate is controlled by diffusion of tritium in the bul…
Presents a hyperbranched polymer, a hydroxyl functional aliphatic polyester which consists of a polyalcohol core from which branches extend, forming a core‐shell structure with a large number of hydroxyl groups at its peripheral surface. It is polydisperse and consists, apart from the main core/shell fraction, of a mi…
500-kV XLPE-insulated cable with an insulation thickness of 27 mm has been developed for long-distance transmission lines. Basic studies on 500-kV XLPE cable have shown that contaminants in the insulation may be the factor determining electrical performance. This hypothesis is justified by the good correlation obtaine…
Formate is the major source of C1 units in many species of the genus Clostridium. In this study we have cloned and characterized the genes encoding pyruvate formate-lyase and its activating enzyme of Clostridium pasteurianum. The genetic and transcriptional organizations of the genes and the high level of homology exh…
For two compounds of the thiobenzoate series, the Sc*α phase has been studied. For the first time to our knowledge, its helicity is revealed, by observation of very thin liquid crystal drops. Helical pitch measurements have been performed, and the pitch variations versus temperature studied. The pitch is very small fo…
Abstract Combined LC‐polymers possess the structural properties of both LC main chain and LC side chain polymers. Beneath this structural speciality, their broad LC‐phases and their polymorphism (different smectic phases and one nematic phase as a function of temperature) make them interesting. Crucial to an understan…
An apparatus is described for the measurement of second-order nonlinear optical properties via hyper-Rayleigh scattering with 1 cm−1 spectral resolution of the scattered light. The setup allows a complete investigation of the polarization dependence of the second-harmonic scattered light. The combination of good spect…