Materials Literature
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Electric field/space charge profiles obtained using the laser-intensity-modulation-method (LIMM) are presented for XLPE samples machined from power cable insulation cross-linked using dicumyl peroxide. The samples, 110 mum thick with vacuum-evaporated aluminium electrodes, were subjected to DC fields of 48 kV/mm and b…
Purpose This work sets out to characterise the protective properties of conformal coatings and how they degrade. Design/methodology/approach The approach dosed several commercial coatings with two different contaminants, a synthetic generic flux mixture of dibasic acids in both a solvent‐ and water‐based carrier, and…
Abstract A new hyperbranched aromatic poly(ether sulfone) with sulfonyl chloride terminal groups was prepared by polycondensation of a new AB2 monomer (1), 4,4′-(m-phenylenedioxy)bis(benzenesulfonyl chloride). The polymerization was carried out in nitrobenzene at 120 °C for 3 h in the presence of a catalytic amount of…
Abstract Differences in equilibration rates among crystals of different sizes may be used to deduce paleofluid changes over time if the crystal-growth mechanism is known. To explore isotopic equilibration rates as a function of illite growth, we studied B-isotope changes during illitization of smectite. Montmorillonit…
The magnetic convection of paramagnetic fluid is studied in a strong magnetic field. The fluid in a cubic enclosure is heated from one vertical wall and cooled from the opposite one. The fluid is the 80% mass aqueous solution of glycerol with 0.8 mol/kg concentration of gadolinium nitrate hexahydrate to make the worki…
Aerosol OT/water exhibits a lamellar phase over a wide range of concentrations. We show, by magnetic resonance (NMR) and scanning electron microscopy (SEM), that the morphology of the lamellar phase varies significantly across that range and that the rate of equilibration depends strongly on concentration (25, 33, and…
In this paper a methodology for applying thermoelastic stress analysis (TSA) to superelastic, nickel-titanium (Nitinol), shape memory alloy self-expanding stents is described. A test rig has been designed that allows the stents to be loaded under a pseudophysiological loading of internal pressure. High-resolution ther…
An explicit solution for the longitudinal and transverse polarizability of the symmetric dielectric intersecting double sphere is obtained as a rapidly converging series of integral operators, which is fast enough for real time calculation in Java Applet.
Using an integrated measurement system, partial discharge activity has been recorded simultaneously in terms of radiated energy and IEC60270 apparent charge. Correlation between these two quantities can yield important information regarding the shape of the underlying PD pulse. It is proposed that this new measurement…
The effect of the microstructural parameters and the nonmetallic-inclusion content in a steel on its service properties is analyzed for the rail steels of experimental batches that are produced in Russia and abroad and exhibit different service durabilities upon full-scale tests. The dendritic structures of these stee…
Sodium sulfur battery is one of the most promising candidates for energy storage application. It displays high power and energy density, temperature stability, low cost and good safety. This presentation summarizes the recent development of sodium sulfur battery, especially their applications in energy storage.
Abstract A systematic study of cathodoluminescence (CL) emission arising from free exciton recombination in diamond is given. CL spectra of free exciton emission from diamond under high excitation conditions were used to characterize properties of ultradense exciton gases at quasi‐thermal equilibrium. Theoretical spec…
Abstract Single crystals of Nd 5 (AsO 3 ) 4 Cl 3 (monoclinic, P 2/ n , Z = 2, a = 1026.0(1), b = 543.35(3), c = 1400.2(1) pm, β = 93.48(1)°) were obtained from the reaction of Nd 2 O 3 , As 2 O 3 and NaCl in a sealed silica ampoule. In the crystal structure the Nd 3+ ions are linked by AsO 3 3− groups into layers that…
In this paper, we report some preliminary measurements on the dielectric response and properties of boron nitride filled epoxy resin composites consisting of a typical anhydride cured bisphenol-A epoxy resin system. Both conventional stirring and ultrasonic processing had been used to obtain fine dispersion of the mic…
The results of INDO/s and TD-DFT calculations for neutral ZnPc (−2), unligated [ ZnPc (−1)] + and chloride anion ligated [( Cl ) ZnPc (−1)] cation radicals, the [ ZnPc (−3)] − radical anion and [ ZnPc (−4)] 2− dianion species, performed on a set of B3LYP geometry optimizations are compared with magnetic circular dichr…
Electromagnetic interference is one of the main distortion sources in scanning electron microscopy. Electromagnetic interference-generated scanning electron microscopy image distortions are usually visible as edge blur (at low scan rates) or vibration (at high scan rates). Hardware solutions to this problem, e.g. elec…
Dynamic birefringence and dynamic viscoelasticity of polymer brush type polystyrene polymacromonomer, PM, consisting of only styrene unit were measured over a wide frequency region including the glass transition region. The stress−birefringence relationship elucidated that the stress relaxation of the PM proceeded thr…
It is shown that the chemical formulas of A m−1Bi2BmO3m+3 Aurivillius phases containing perovskite-like slabs of different thicknesses can be expressed through the formulas of the simplest layered compounds and several perovskites, representing them in the form of infinite series. Those members of such series which ma…
The pressure dependence of the refractive index for a glass of the composition 0.50SiO2 · 0.25Al2O3 · 0.25CaO at pressures up to 5.0 GPa is determined using a polarizing interference microscope and an apparatus with diamond anvils. The densities and compressibilities of the glass are calculated from the measured refra…
Using cellulose acetate plastics as an example, it was shown that the search for the optimal concentrations of plasticizers should take into account the compatibility of components, as well as the thermophysical and mechanical properties of plasticized polymers. It was suggested that the temperature range of durabilit…