Materials Literature
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A neural network system, utilizing the multi-layer perceptron approach has been applied to distinguish between power cable insulation partial discharge pulse shapes that are characteristic of cavities and electrical trees. The neural network was found to be capable of recognizing the differences in PD pulses produced…
Silica is an important industrial chemical but the mechanisms involved in its formation from aqueous precursors remain far from well understood. In this study we have prepared a range of silicon catecholate salts where M+ is Li+, Na+, K+, NH4+, Et3NH+ and followed complex breakdown and silica oligomerisation under app…
P. R. Unwin and J. V. Macpherson, Chem. Soc. Rev., 1995, 24, 109 DOI: 10.1039/CS9952400109
Polylactide (PLA) microspheres containing ovalbumin (OVA) as a model protein were prepared by a water-in-oil-in-water (w/o/w) emulsion solvent evaporation method. The optimization of preparative parameters for the PLA microspheres containing OVA were performed, and the in vitro characteristics of the obtained microsph…
In this paper a comparative study is presented of four hysteresis models with regard to the numerical computation of the fields inside soft magnetic laminations. Addressed topics include parameter identification and precision. All computed results are compared with measurements.
Manganiferous rock varnish collected from Death Valley and Antarctica contains the smallest known terrestrial sedimentary deposits, with some layers only a few nanometers thick. Irregularities in these nanometer-scale layers are consistent with shrinking, cracking, and weathering of clay minerals. In the Death Valley…
Four new binucleating symmetric bis(4-pyridine-2,6-dicarboxylic acids) have been synthesized and luminescence enhancement of their EuIII complexes by YIII ions observed. The results indicate that the mechanism of enhancement is based on the formation of a polymeric structure where EuIII ions and YIII ions are linked t…
Various procedures for designing basis sets to be used in the computation of high-quality wave functions have been considered. The most satisfactory results for the polarizability and hyperpolarizabilities of He, H2, Be, Ne, F−, and HF were obtained using the core basis sets of van Duijneveldt, augmented by 7f1(l+1)5f…
The TS-1/H2O2 system efficiently catalyses the hydroxy-assisted chemoselective epoxidation of α-hydroxyalkene in geraniol, and the stereoselective epoxidation of cyclopent-2-en-1-ol/cyclohex-2-en-1-ol producing the epoxide which is cis to OH with high selectivity (90:10 cis: trans).
A simple gedanken experiment is presented to demonstrate the violation of charge (and energy) conservation, as predicted by D.E. Ward (1981), J.J. Paulos and D.A. Antoniadis (1983), and D. Root and B. Hughes (1988), in the two-parameter nonlinear modeling of capacitance. The paradoxes are resolved through examination…
Samples of the spinel series, MnxFe3 –xO4(O ⩽x⩽ 3), have been synthesized by the hydroxide coprecipitation technique and characterised by chemical analysis; XRD and SEM techniques, and measurements of their BET specific surface areas, saturation magnetisations and electrical resistivities. The specimens with values of…
Abstract
The design of anti-friction coatings able to perform well in different wear conditions without lubricants requires a combination of adequate hardness and toughness, good adhesion, a low friction coefficient and a low wear rate. Recently introduced metal-diamond-like carbon (DLC) coatings can be a major step towards th…
Complexes formed between 4-alkoxystilbazoles and 3-cyanophenol show liquid crystal mesophases. Compared to the mesomorphism of similar complexes formed between stilbazoles and 4-cyanophenol, the mesophases are more stable and are enantiotropic.
A 120 kW coaxial winding transformer has been built and tested to verify previous indications that a high power transformer is feasible with the key attributes of this novel design, namely: low leakage inductance, minimal effect of leakage field on core losses, low copper losses, and a convenient "nesting" structure w…
Using picosecond time-domain reflectometry, dielectric relaxation studies have been carried out for p-fluorophenylacetonitrile(FPA)–methanol(MeOH) mixtures over the frequency range 10 MHz–10 GHz at various temperatures. The relaxation in these systems can be described by a single relaxation time using the Debye model.…
Vincristine is a potent therapeutic agent with activity against a variety of tumor types. It is a cell-cycle specific agent which has exhibited enhanced anti-tumor activity when delivered in liposomal form. Vincristine can be encapsulated into large unilamellar vesicles in response to a transmembrane pH gradient with…
UV irradiation of the gas/solid interface of microcrystalline TiO2 in the presence of water and carbon dioxide in the gas phase at 343 K leads to photoreduction of carbon dioxide to form carbon monoxide, hydrogen and methane.
Various amounts of vanadium pentoxide (V/sub 2/O/sub 5/) were introduced to the NiCuZn ferrite to reduce the sintering temperature. The V/sup +5/ cations entered the crystal lattice of the ferrite and improved the initial permeability and quality factor, 0.5 mol% of V/sub 2/O/sub 5/ was required to form the liquid pha…
Reaction of octakis(dimethylamino) porphyrazine 1 with [60]fullerene gives a crystalline 2:1 charge-transfer (CT) complex as a three-dimensional network of chains; in contrast, reaction of 1 with tetracyanoquinodimethane (TCNQ) gives a crystalline 1:1 charge transfer salt as one-dimensional integrated stacks.