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The transmission characteristics of a two-dimensional coaxial Bragg structure have been investigated in this paper. The dielectric layer between the outer and the inner conductors of the coaxial waveguide in the structure is helically corrugated and the grooves are loaded with a metallic strip. It is found that, a dominant transmission bandgap can be obtained from the mode conversion induced by the...
The hybrid material of PI (with SiC whisker, SiC particle, AlN particle, and diamond particle) is proposed to satisfy the requirement of higher thermal conductivity for the high density package system. The thermal conductivity of the proposed hybrid materials with a moderate amount of doping can be improved to about 6–12 times. The hybrid films are fabricated by mechanical ball-milling process, high...
We have studied the effect of substrate temperature in molybdenum (Mo) back contact deposition on its structural evolution, optical properties, and most importantly, the over-deposited CuIn1−xGaxSe2 solar cell performance. A series of Mo thin films was DC sputtered onto thermally oxidized Si at substrate temperatures from 25°C to 385°C. Real time spectroscopic ellipsometry (RTSE) was performed to...
In this paper, focus is made on partial discharge (PD) activity in oil-impregnated pressboard used in converter transformers. Voltages over the main insulation of the valve-side windings of the converter transformer were analyzed using the PSIM software. Next, transformer defects were simulated by insulation models to generate PD signals. The dependence of PD inception voltage (PDIV) on the AC plus...
Increasing wind power generation quantity needs obviously reliable insulation property of power equipment. Since over 70% of the installed turbines utilize wound rotor induction machines (referred to as double-fed induction generators DFIG) , DFIG is deemed to be one of the most critical components of wind power systems and its performance directly influences the stability and reliability of wind...
Vegetable insulating oils are fire-resistant and environment-friendly liquid dielectrics, so it gets wide attention of scholars both at home and abroad. The paper used pyrolysis method preparation the Fe3O4 nano-particles vegetable insulating oil with narrow particle size distribution and high dispersion. The paper also studied on the influence of nano-particles insulating vegetable oil stability...
Abatement of gaseous toluene via alterable frequency dielectric barrier discharge (DBD) plasma in a coaxial cylindrical reactor was carried out at atmospheric pressure and room temperature. During plasma processing to decompose toluene, discharge power was analyzed by using the Q-V Lissajous diagram. It suggested that, the specific energy density (SED) increased with the increasing of applied voltage...
Insulating vegetable oils are fire-resistant and environment-friendly liquid dielectrics. This paper presents a type of nano-modified insulating vegetable oil. The nano-modified insulating vegetable oil was prepared by homogeneous precipitation deposition of ferroferric oxide nano-particles. It was characterized by a laser nano-particle size analyzer. Its electric properties, including AC breakdown...
Polycrystalline CuInSe2 (CIS) thin films ~100 nm thick were deposited using the co-evaporation method onto fused quartz substrates held at three different substrate temperatures (Ts): 450°C, 525°C, and 600°C. The films were characterized with spectroscopic ellipsometry (SE) both from the film side and through the glass. These SE data with both measurement geometries were analyzed together, based on...
Abatement of gaseous toluene via alterable frequency dielectric barrier discharge (DBD) plasma in a coaxial cylindrical reactor was carried out at atmospheric pressure and room temperature. During plasma processing to decompose toluene, discharge power was analyzed by using the Q-V Lissajous diagram. It suggested that, the specific energy density (SED) increased with the increasing of electric field...
An experimental research on hydrogen sulfide removal by DBD was carried out. This study explored the influences of initial concentration ,gas flow rate, applied voltage and frequency on hydrogen sulfide removal. In addition, the differences among the no packing and ceramic raschig-ring packing in the reactor were discussed. Meanwhile, during plasma processing to decompose hydrogen sulfide, SIE was...
Real time, in situ, and ex situ spectroscopic ellipsometry (SE) methods have been applied in systematic studies of the structure and optical properties of polycrystalline CdTe and CdS thin films deposited by rf magnetron sputtering. The goal of this ongoing research is to establish a basic understanding of the relationships between the physical and optical properties, including how the void fraction,...
This paper presents basic dielectric properties of a type of insulating rapeseed oil, including its breakdown voltage, relative permittivity, and dissipation factor. Inception voltages of partial discharges (PD) occurring in this type of insulating rapeseed oils are also presented. PDs in insulating rapeseed oils are not only detected by the pulse current method recommended by IEC 270, but also observed...
This study focuses on the development of an optical property database through spectroscopic ellipsometry analysis of II–VI polycrystalline alloy thin films for tandem photovoltaics. The materials of interest for the active layer components in this application include top cell Cd1-xMgxTe and bottom cell HgxCd1-xTe. Such materials are being explored for use in current-matching two-terminal -- as well...
Real time spectroscopic ellipsometry (RTSE) has been applied to study the magnetron sputter deposition of polycrystalline CdTe and CdS thin films on crystalline silicon wafer substrates held at different temperatures (Ts). The broadening parameters Γn of the dielectric function critical points (CPs) measured at room temperature for the CdS and CdTe films show variations with Ts, from which the group...
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