Materials Literature
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Silicone fluids appear to be well-suited to applications in higher temperature rise transformer designs; smaller, lighter-weight transformer designs; and transformers which could operate above rated capacity periodically without significant loss of insulation life. This would require a selection process to match the p…
An epoxy composite used as cast electrical insulation in outdoor applications is studied for property and structure changes caused by aging under intensified electric field. The dielectric loss and the dielectric strength of the material are found to be slightly changed over an aging time of 1500 hours. Dynamic mechan…
Stress-free micromechanical cantilever beams have been fabricated by selective etching of silicon p-n structures in HF solutions utilizing a photo-assisted electrochemical process. With this technique, n or p regions can be selectively etched at controlled rates by appropriate choice of cell bias, p-n junction bias, a…
A rather complete numerical simulation program for electrical and thermal characteristics of a two-dimensional gated field emission triode is presented. Important aspect such as space charge effect, Joule heating, Nottingham effect as well as thermally-dependent heat conductivity and electrical resistivity are include…
The thermal degradation mechanism of EI (polyester imide) film on copper and aluminum wire was investigated. The effects of the metallic conductor on the degradation behavior and diagnosis methods applied to the EI films are reviewed. The physico-chemical properties were evaluated using a thermogravimetric analyzer, a…
Abstract This article is concerned with the reflectance spectra prediction based on a neural network developed for yarn from the roving reflectance spectra. The neural network developed is a multilayer feed‐forward network. The first system is wavelength dependent, but its performance is not very satisfactory. The sca…
The application of electromagnetic field theory to the subject of partial discharges shows that discharging in a void generates large field distortions within the bulk dielectric in the proximity of the void. Such inherent over-stressing of a dielectric could be the effect which triggers the onset of electrical treein…
The value of the room-temperature copper-gold interdiffusion coefficient derived by extrapolating from high-temperature measurements is an underestimate by several orders of magnitude. Plating copper with a gold film has several disadvantages. Two specimens were analyzed by using Auger electron spectroscopy. Once the…
In this contribution the interest is centered on interaction phenomena that occur between the CuInSe/sub 2/, the chemical bath deposition (CBD) used to grow buffer layers and the RF sputtered ZnO windows. The potential output of a better understanding of these interfacial aspects is to permit high quality device synth…
The authors present a study of the effects of the particle size of ATH (alumina trihydrate) on the performance of RTV (room-temperature vulcanizing) coatings on fiber glass rod insulators under contamination and wet conditions in a salt-fog chamber. Examination of the surface using attenuated total reflection Fourier…
Based on general semiconductor device equations and results of two-dimensional modeling (PISCES), an analytical insulated gate bipolar transistor (IGBT) model has been developed. Temperature effects in the range 250-450 K are considered. The electrical-thermal model has been simplified to a level which enables impleme…
A method for calculating the inductance of planar-spiral structures in the presence, and in the absence, of magnetic core material is presented. In this method, the current is assumed to flow in the exact center of the planar conductor. Simplified expressions for the self inductance of each turn comprising the inducto…
The effect of high acceptor dopant concentration of Zn2+ on electrical, optical and structural properties of the In2O3 transparent conducting thin films, Mohammad-Mehdi Bagheri-Mohagheghi, Mehrdad Shokooh-Saremi
The variable dose (VD), T m – T stop , initial rise, variable heating rate, peak shape and computerized glow curve deconvolution (CGCD) methods were used to determine the number of peaks, the order of kinetics ( b ), the activation energy ( E a ) and attempt-to-escape frequency ( s ) associated with the dosimetric glo…
Deep Purple, a new photoactive group: The combination of a heteroaromatic diarylethene core (shown in the graphic) separated from mesogenic cyanobiphenyl groups by alkyl spacers allows the synthesis of photochromic liquid crystalline systems with nematic and smectic C phase behaviour between room temperature and 80 °C.
ZnO–SiO2 composite films consisting of ZnO nanoparticles embedded in a SiO2 matrix (ZnO : SiO2 = 20 : 80 molar ratio) were prepared by the sol–gel technique. Annealing in the range 473–773 K in air, hydrogen and oxygen atmospheres showed high stability of the particle radius due to effective capping within the silica…
We have analytically computed the energy-loss probability of a fast electron passing near a locally anisotropic hollow nanotube, in the nonretarded approximation. Numerical simulations have been performed in the low loss (below 50 eV) region, and a good agreement with experimental spatially resolved electron energy-lo…
Se han determinado algunos efectos de la exposición prolongada a temperaturas y presiones altas, características del transporte del vapor en una central térmica, en las conducciones de acero 12HMF GOST (13CrMo44 DIN) Cr-Mo de baja aleación, a nivel macro y microestructural a través de ensayos mecánicos y microscopia ó…
An equivalent diagram with localized constants has been created to represent the two winding transformer. The equivalent diagram with localized constants is practically independent of the transformer construction. Only the numeric constants change from one component to another. This circuit can be introduced into conv…
An enumeration and discussion of the physical, thermal, mechanical and magnetic problems of Alnico permanent magnet materials are presented. Some of the milestones in the development of this class of alloys are shown. The physical properties of cast and sintered Alnico permanent magnets are presented, together with th…