Materials Literature
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The electrical properties such as water tree length, electrical conduction, ac breakdown strength and space charge of silane crosslinked polyethylene (SXLPE) were investigated, with a purpose to compare this material with ordinary dicumyl peroxide (DCP) crosslinked polyethylene (XLPE). Experimental results show that S…
We have detected an intermediate in the process of singlet-oxygen-sensitized delayed fluorescence (SOSDF) using tetra- tert -butylphthalocyanine (Pc) as the fluorescer and C 60 as the sensitizer. The observed intermediate is dependent on the concentrations of Pc, 1 O 2, and 3 O 2, as is SOSDF. By modeling the kinetics…
We present a simple two-dimensional model system which tends to organize itself in the form of a quasiperiodic state. The system is composed of one sort of particles only, with mutual interactions that strongly deviate from the standard Lennard-Jones-type of potentials at intermediate distances. The dynamics of this s…
Magnetic properties of the Laves phase compounds $\mathrm{Lu}({\mathrm{Co}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{)}_{2}$ $(0.10\ensuremath{\leqq}x\ensuremath{\leqq}0.22)$ have been investigated under the duplicate conditions, i.e., high magnetic fields with high pressures. The pressure effect on the Curie temperature $…
Time domain energy dispersive X-ray absorption spectroscopy provides a powerful probe of changes in molecular structure that occur during photoinduced electron transfer reactions. In this study a diporphyrin model for electron transfer within modified heme proteins is examined using this technique. Transient optical a…
The structure of lead hafnate has been accurately determined at 10 K and at room temperature by two different diffraction methods: neutron powder and electron diffraction. Results from the two methods are in good agreement. The structure is shown to be isomorphic to the lead zirconate structure, although its behaviour…
In this paper, an heuristic algorithm is presented for the evaluation of the parameters of additive-Weibull distributions having more than two elementary functions, which is a necessary condition when testing complex insulating structures with different partial discharge (PD) sources. The algorithm has, in principle,…
The influence of the strain rate on the superelastic behaviour associated with the martensitic transformation is investigated by tensile tests for TiNi shape memory alloy. The results are summarized as follows. The increase in the temperature due to the stress-induced martensitic transformation measured by a non-conta…
Maltooligosyl trehalose synthase, one of the two enzymes in the coupled trehalose biosynthesis system in Sulfolobus acidocaldarius, has been purified and crystallized. The chemical modification of this enzyme by reductive methylation of lysine residues significantly improved the crystal quality for X-ray diffraction e…
This article describes new methods for X-ray crystallographic refinement and nuclear magnetic resonance (NMR) structure determination that are available in the recent release of the X-PLOR software, X-PLOR 98.0. The major new features of the X-PLOR 98.0 software are: (i) the introduction of maximum likelihood methods…
Silsesquioxanes having 1-(2-methoxy-1-benzothiophen-3-yl)-2-[5-(4-butylphenyl)-2, 4-dimethylthiophen-3-yl]perfluorocyclopentenes as the pendant groups were synthesized. Photochemical conversion from the open-ring to the closed-ring forms of the dithienylethenes increases when the methyl group at 2-position of the benz…
An electrolytic gel coating on AISI 316L stainless steel sheets has been investigated. The coating was produced by reduction of a aqueous solution. Thermogravimetric and differential thermal analysis (TGA and DTA, respectively) of the as‐formed electrolytic gel coating were conducted between 298 and 1373 K. Three tran…
However, no theoretical analysis of the photodecomposition alignment mechanism has been carried out. The photochemical mechanism is different for photopolymerization and photodecomposition, but the origin of the photoalignment of the LC is a UV dichroic absorption of the alignment material molecules. Therefore, we app…
Hydrogen adsorbed on Ru/ZrO 2 was studied by FT-IR (Fourier transform infrared) spectroscopy. While the Ru−H (Ru−D) species was not observed, the H 2 O (D 2 O)-like species was formed by H 2 (D 2 ) introduction on ZrO 2 . The H 2 O (D 2 O)-like species was characterized by a band at around 1600 (1190) cm -1 due to the…
Multicomponent semiconducting oxide glasses like (80 V2O5–20 PbO)+xBaTiO3 (x=5–30 wt %) dispersed with nanocrystalline BaTiO3 have been prepared by a fast quenching technique. Results of microstructural study and transport properties (between 80 and 450 K) of these glasses and some glass ceramics have been reported in…
New hyperbranched organosilicon polymers have been prepared from 2-bromo-5-(trimethoxysilyl)thiophene. The intermediate alkoxy-substituted hyperbranched polymer is functionalized with Grignard reagents in situ, leading to the isolation of a series of air- and moisture-stable polymers. The polymers contain alternating…
Experimental solubilities are reported for anthracene dissolved in ternary l-propanol+ l-butanol+heptane, l-propanol+2-butanol+heptane, 2-propanol+l-butanol+heptane and 2-propanol+2-butanoI+heptane solvent mixtures at 25°C. Nineteen compositions were studied for each of the four solvent systems. Results of these measu…
The corrosion behavior of aluminum, a candidate material for the current collectors of the positive electrodes of lithium‐polymer batteries, in contact with a lithium polymer electrolyte was examined in both batteries and three‐electrode electrochemical cells. The results indicate aluminum is resistant to uniform corr…
Germanosilicate glasses are prepared by a sol–gel method and the ultraviolet (UV) photosensitivity of the glasses is investigated by optical absorption, electron spin resonance, and photoluminescence measurements. A KrF pulsed laser and a Hg lamp are used as UV light sources. The concentrations of intrinsic germanium-…
Milling of V 2 O 5 in a ball mill increased the surface area from 7 to a maximum of 32 m 2 /g. Simultaneously, XRD line broadening suggested a reduction of the microcrystallites. A color change during milling indicated oxygen loss, and Raman spectroscopy provided evidence for the formation of shear structures such as…