Materials Literature
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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…
The charge control approach to modeling is extended to power devices by converting device equations to charge modules, which can then be used to assemble device models. This method represents a systematic technique for constructing models for power electronic circuit simulation. The resulting models are represented by…
Digitalization in electronic systems is required with capacitors which are large capacitance with small size, low impedance at high frequency, and high reliability. The fabrication and properties of aluminium solid electrolytic capacitors are investigated. Employing a conducting polymer film such as, polypyrrole as so…
In a previous study, the existence of a field enhancement in the solid dielectric in the vicinity of void undergoing PD activity was established. That study was undertaken with reference to a spherical void. In this paper, a more general investigation of this phenomenon of field enhancement is undertaken by extending…
Alumina loaded new molding compounds feature a thermal conductivity up to 4.5 W/mK, a water uptake smaller than 0.2 weight %, a coefficient of thermal expansion of 10 ppm/K and an excellent popcorn resistance (0 cracks from 6). The thermal conductivity of such particulate-loaded polymers has been investigated as a fun…
The pressure wave propagation (PWP) method has been used to measure the space charge and the electric field distributions in transformer oil impregnated pressboard under DC electric field at a moisture concentration in the order of 0.1%. The development of space charge versus the amplitude and the polarity of applied…
It is well known that water-tree is one of the main reasons of XLPE cable insulation aging. With the widespread use of XLPE cables, how to diagnose water-tree aging in insulation becomes more and more important. It has been found that a small DC component will be produced through the insulation of XLPE cables in servi…
Silicone rubber housed nonceramic insulators were studied after field aging in various service environments for periods of from 7 years to more than 10 years. The condition of the aged silicone rubber was compared to that of new material, focusing on the characteristics of hydrophobicity recovery and contaminant encap…
A degradation of silicone rubber for polymer insulator housing by ultraviolet radiation was studied. The following techniques were used to investigate surface degradation of silicone rubber: Measurement of Contact Angle; Energy Dispersive X-ray (EDX) Analysis; Fourier Transform Infra-Red (FT-IR) Spectroscopy; Scanning…
Under a stratified flow regime and under dewing conditions, internal corrosion can occur at the top of horizontal pipelines.Corrosive gases such as carbon dioxide dissolve in the freshly condensed water on the inner pipewall where continuous injection of inhibitors of corrosion is not possible.In absence of such inhib…
The objectives of this study on silicone rubber materials were: (1) to determine the threshold of low molecular weight (LMW) silicone polymer on the surface needed for hydrophobicity recovery, after it has been temporarily lost due to dry band arcing, and (2) to determine the dominant source of LMW chain regeneration…
ABSTRACT Cyclic tests performed in the temperature range 300–773 K on duplex stainless steel DIN 1.4460 show that the cyclic stress–strain behaviour of this steel is strongly temperature dependent. At 300 and 473 K an almost constant peak tensile stress stage, is followed by a slight softening that continues up to fai…
Electrical breakdown at the interface of two dielectric surfaces is a complex phenomenon and is one of the major causes of failure for cable accessories. The dielectric strength of an interface increases with interfacial pressure and is substantially improved by the presence of electrical insulating greases. In order…
A method for compensation of flicker and harmonic distortion in electrical plants supplying arc-furnaces, which consists of the insertion of series inductors and AC harmonic filters, is investigated. For this purpose, a three-phase model of an arc furnace, implemented by EMTP, is provided, where arc-length time variat…
Surface flashovers of high voltage insulators occasionally occur in areas where industrial or coastal pollution is present. Particularly they may take place on sites where the level of pollution has been underestimated at the design stage or the equipment and its insulation have not been properly designed for the spec…
This paper describes the Preisach theory of hysteresis models using a graphical approach. A new simple mathematical function which can relate the Preisach diagrams and the B-H limiting loop is developed and presented. With this new function, the Preisach hysteresis model can be implemented easily without the use of an…
In this paper, we present a practical process to obtain bifacial Si solar cells. These cells are made using p/sup +/nn/sup +/ structure on high-medium base resistivity, continuous emitters and with a process that maintains high bulk minority carrier lifetime. Efficiencies of 19.1% and 18.1% are achieved under standard…