Materials Literature
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For many years the IEC 270 partial discharge (PD) measurement technique has been the international standard. To improve the ratio of PD signal to thermal amplifier noise and to reduce sensitivity to external noise, "ultra"-wideband techniques have been proposed as an alternative to IEC 270. This paper will show that i…
The loss of hydrophobicity of room temperature vulcanizing (RTV) silicone rubber coating on insulators, due to dry band arcing in the presence of contamination and moisture, causes a deleterious effect in the electrical performance of the coating. For example the growth of the leakage current is accelerated resulting…
This paper is an extension of the gyrator-capacitor more model introduced by D.C. Hamill (1994). This core model is simple, efficient and handles both linear and nonlinear cores. The only item lacking is an efficient core loss element for determining circuit Q and efficiency. The gyrator re-cap core model contains a c…
Plane-parallel electrodes coated with epoxy resin have been used to investigate partial discharge (PD)-induced degradation of the insulating material. The mean amplitude of pulse-type discharges has been measured as a function of PD exposure duration, while light emission from the discharge space was simultaneously mo…
The application of power semiconductors at cryogenic temperatures has recently gained significance in protection elements of SMES (superconducting magnetic energy storage) operating at LHT (liquid helium temperature). The evolution of HT (high temperature)-superconductors, however, is still proceeding and will provide…
Abstract A detailed analysis of isotropic and anisotropic Raman spectra of carbonyl stretching vibrations of ethylene carbonate in different systems was conducted. The variation of Fermi resonance perturbed spectral profiles was used to investigate changes in local molecular surroundings in polymer gel–electrolyte sys…
This paper presents the computer simulation of the transient space-charge distribution in degassed and non-degassed cross-linked polyethylene (XLPE) which was measured by a pulsed electroacoustic method by Li and Takada (1991). The simulation was made on the transport of both bulk-excited and electrode-injected carrie…
This paper presents the design and application of permanent magnets in hysteresis motors with a view to improve the overall performances of such motors. The novel rotor consists of 36% cobalt steel alloys with neodymium boron iron permanent magnets. This hybrid design combines advantageous performance features of both…
The variations of crystal structure, magnetization, and conductivity resulting from the chemical pressure effects of substituting Sr 2+ by the smaller Ca 2+ in the double-perovskite (Sr 2 - x Ca x )FeMoO 6 have been investigated. An increase in the Ca content leads to an increase in the Fe/Mo ordering in the materials…
We are able to analyse the SF/sub 6/ decomposition directly during a discharge by means of a FT-IR (Fourier transform infrared) spectrometer and a 2.51 stainless steel discharge cell with infrared windows and a path length of 0.175 m. With this cell we investigated the influence of water vapour and oxygen on the produ…
The presence of metal particles within gas insulated switchgear (GIS) might initiate a sparkover and lead to fatal failure of electric power transmission system. In order to investigate the behavior of a particle in GIS, model electrodes and a measuring system were constructed. The motion of a particle was investigate…
A new method to calibrate thermoelectric power sensors is established and investigated, where the effective efficiency is directly determined in a microcalorimeter. A commercially available power-thermovoltage converter (power sensor) without any electronics is used. The results show good agreement with results obtain…
Abstract The supported (Ni–Pd) catalysts showed high activity and long life for methane decomposition to form hydrogen and carbon nanofibers of a unique structure.
The partial discharge pattern of electrical treeing in polyethylene was investigated by using a computer aided partial discharge measurement system. It was found that partial discharge from an electrical tree is characterized by the so-called wing-like pattern. By using the wing-like patterns, treeing degradation was…
Abstract Two series of novel fluorinated aromatic polyamides were prepared from 1,1‐bis[4‐(4‐carboxyphenoxy)phenyl]‐1‐phenyl‐2,2,2‐trifluoroethane with various aromatic diamines or from 1,1‐bis[4‐(4‐aminophenoxy)phenyl]‐1‐phenyl‐2,2,2‐trifluoroethane with various aromatic dicarboxylic acids with the phosphorylation po…
A series of trinuclear metal clusters MS4(M'PPh3)2(M'PPh3) (M = Mo, W; M' = Cu, Ag, Au) have been studied using the density functional theory (DFT) method. The static polarizabilities and hyperpolarizabilities of the model clusters have been calculated using the finite-field (F-F) method. The model clusters, divided i…
Abstract Förster exciton transfer from a ’sensitizer’ to an ’emitter’ dye allows for the decoupling of the excitation and emission processes in dye lasers. Here, we report on the lasing from a Förster transfer couple dissolved in an unconventional, mirrorless resonator; namely, a chiral nematic liquid crystal (CNLC).…
Abstract A novel and simple route, called in situ template-controlled (ISTC) method, has been developed to fabricate low-dimensional CuS nanorods by firstly taking advantages of TMLC’s semi-ordered arrangement.
Photochromic fluorinated indolylfulgides have been identified as potential candidates for a wide range of applications including optical switches, photoregulators of biological processes, and optical memory media. In humid environments or biological systems, hydrolytic stability is essential. In an effort to improve h…
We introduce simple models, inspired by previous models for froths and covalent glasses, with trivial equilibrium properties but dynamical behaviour characteristic of strong glass forming systems. These models are also a generalization of backgammon or urn models to a non-constant number of particles, where entropic b…