Showing 1-25 of 29,084 resultsfor "Index Terms":Surface Conductivity
"Index Terms":Surface Conductivity
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Effects of surface conductivity on surface charging behavior of DC-GIL spacers
Junhong Chen;Jianyi Xue;Junhao Dong;Yuan Li;Junbo Deng;Guan-Jun Zhang
In this study, a simulation model is established to study the effect of surface conductivity on the accumulation of surface charge. The simulation shows that hetero-charges increase on areas away from the high voltage electrode and the electric field distribution along the surface becomes more uniform with increased surface conductivity. The dominant surface charging mechanism changes from conduct...Show More
Influence of the Surface Conductivity on the Stability of a Glow Dielectric-Barrier Discharge
The aim of this paper is to illustrate how a noninsulating surface in contact with a glow dielectric-barrier discharge induces the formation of microdischarges. Short-exposure-time pictures synchronized with the discharge show that microdischarges only occur when the conducting surface is on the cathode side and their duration is on the order of 5 mus. This long duration is confirmed by surface sc...Show More
Estimation of blood perfusion using phase shift in temperature response to sinusoidal heating at the skin surface
A closed form analytical solution of the Pennes' bioheat equation was obtained for temperature distributions in the skin tissue subject to the sinusoidal heat flux. Phase shifts in the surface temperature response were revealed to be related to local blood perfusion rate and heating frequency. The influence of the thermal contact resistance on the perfusion estimation was investigated. It has been...Show More
Improvement of the thermal conductivity by surface iodination
2013 14th International Conference on Electronic Packaging Technology
Year: 2013 | Conference Paper |
With the increasing demand of high power density electronics, heat dissipation becomes an urgent problem. In order to address this problem, we introduce a surface modification method for silver that are employed as fillers to prepare the thermal conductive adhesive (TCA). After simple iodine pretreatment, there exist some nano-sized small structures on the surface of fillers. Compared to the contr...Show More
Significantly enhanced surface electrical conduction of poly(butylene terephthalate) insulators by direct fluorination
Zhenlian An;Huanhuan Xiao;Danli Xie;Feihu Zheng;Qingquan Lei;Yewen Zhang
Commercialization of cyclic butylene terephthalate oligomers has opened the door to bulky poly(butylene terephthalate) (PBT) matrix composite parts. In view of the potential applications of PBT in high voltage insulation or other sectors, where surface charge can play an unwanted role, PBT sheets were surface fluorinated in a laboratory vessel using a F2/N2 mixture with 12.5% F2 by volume at the d...Show More
The physics of conductivity at terahertz frequencies
2015 IEEE International Vacuum Electronics Conference (IVEC)
Year: 2015 | Conference Paper |
Cited by: Papers (4)
Effective terahertz (THz) component and systems design requires accurate predictive models for the frequency-dependent conductivity of materials. We have measured the THz conductivity of metals (including rough surface effects) and doped silicon at 0.4 - 0.85 THz. After a comprehensive analysis, we conclude that the THz-regime conductivity of highly-doped Si is accurately described by Drude theory...Show More
Study of Hydrogen Peroxide Generation by Water Surface Discharge
Kazuki Yoshihara;Ruma;S. Hamid R. Hosseini;Takashi Sakugawa;Hidenori Akiyama
This paper reports on experimental studies of chemical activities of pulse discharge plasmas generated in contact with water surface. The pulse discharge propagated in the form of streamer channels along the water surface. Hydrogen peroxide was used as a chemical probe for the evaluation. Point-to-plane electrode geometry and pulse high voltage of positive polarity was used for the experiments. A ...Show More
The comparative study of overall and partial surface conductivity method
2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena
Year: 2011 | Conference Paper |
Cited by: Papers (3)
How to determine the contamination degree is a hot topic of outdoor insulation. Many researchers overseas and domestic have been exploring the measuring methods of contamination degree of outdoor insulation for a long time, several methods have been found and surface conductivity method is one of them. The measuring condition of overall surface conductivity method is identical with the operation c...Show More
A New Surface Treatment Method for Improving Surface Flashover Performance of Polymers in Vacuum
Yongjie Nie;Xianping Zhao;Na Zhao;Siyang Liu;Shihu Yu;Shengtao Li
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
In this paper, Low density polyethylene (LDPE) films were surface treated in ozone atmosphere for different times (Oh, 1h, 2h, 4h, and 6h) to investigate the effect of surface oxidation on DC surface flashover characteristics in vacuum. Infrared (IR) was used to characterize surface chemical structure of specimens before and after ozone treatment. IR results show that oxygen atoms (O) are introduc...Show More
Effective modulation of surface conductivity of epoxy resin insulators by direct fluorination
Yaqiang Liu;Zhenlian An;Qianqian Yin;Feihu Zheng;Yewen Zhang
2013 IEEE International Conference on Solid Dielectrics (ICSD)
Year: 2013 | Conference Paper |
Cited by: Papers (2)
Epoxy resin samples were surface fluorinated using a F2/N2 mixture at different temperatures for the same time. ATR-IR analyses indicate substantial changes in surface chemical composition and structure by the fluorinations. SEM observations show an increase of thickness of the fluorinated layer and a change of its surface morphology with fluorination temperature. Conductivity measurements reveal ...Show More
Surface and volume conductivities of carbon nanofilled polypropylene films
Oleg A. Emelyanov;Ivan A. Kalinin;Mikhail V. Shemet;Ekaterina S. Tsobkallo
2017 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
The polypropylene films with different concentration of several carbon nanofillers are prepared. Electrical conductivity percolation threshold of the composite films is determined by the conventional two-electrode method. For samples below threshold, relaxation kinetics of locally deposited surface charge is investigated by means of recently developed contactless method. Surface γS and volume γV c...Show More
Moisture effect on surface fluorinated epoxy resin for high-voltage DC applications
Charge accumulation under high-voltage DC is a major concern in the transmission system as its presence distorts the local electric field. By performing chemical treatment on the polymeric insulation via fluorination process, the charge dynamics of the treated material can be modified. Surface fluorination treatment has been proven to be an effective tool to enhance the dielectric properties. The ...Show More
Highly hydrophobic and partially conductive polydimethylsiloxane surface produced by direct fluorination and subsequent annealing
Danli Xie;Zhenlian An;Huanhuan Xiao;Feihu Zheng;Qingquan Lei;Yewen Zhang
Highly hydrophobic materials are of interest in many scientific and technological areas. To improve surface properties of polydimethylsiloxane (PDMS), PDMS sheets were surface fluorinated in a laboratory vessel using a F2/N2 mixture with 12.5% F2 by volume at about 55 °C under 0.1 MPa for different times of 15, 30, and 60min. Surface wettability and surface energy were evaluated by contact angle m...Show More
Surface charge decay on HTV silicone rubber: effect of material treatment by corona discharges
Surface charge decay on thick flat samples of high temperature vulcanized silicone rubber is studied prior and after ac and dc corona pre-treatments. It is found that the charge decay rate on the material exposed to ac corona becomes much higher and sensitive to moisture content in the surrounding air. These features are associated with an increased surface conductivity and formation of a silica-l...Show More
Study of the effect of surface roughness and skin depth on the conductivity of metals at 650 GHz
Matt P. Kirley;Nils Carlsson;Benjamin B. Yang;John H. Booske
A high-quality-factor quasi-optical resonator operating at 650 GHz is used to measure the conductivity of mechanically roughened metal surfaces. The results explore the effective conductivity of metals in the terahertz regime when the surface roughness is on the order of the skin depth.Show More
Lattice Thermal Conductivity Reduction Due to Diffusive Boundary Scattering in Nanowires
2018 IEEE 13th Nanotechnology Materials and Devices Conference (NMDC)
Year: 2018 | Conference Paper |
Cited by: Papers (2)
Diffusive Boundary scattering of phonons due to rough surfaces was investigated for silicon nanowire structures. The roughness of the surface was modeled as a Gaussian distribution. The effects of surface roughness, incident phonon wavelength and angle were taken into account by employing the Bechmann-Kirchhoff (BK) surface scattering model for Electromagnetic waves. The BK model is more accurate ...Show More
Equivalent surface conductivity of ice accumulated on insulators during development of AC and DC flashovers arcs
Surface conductivity of ice was investigated during the development of AC and DC arcs on ice-covered insulators. To determine this parameter, an approach based on fluid mechanics combined with experimental measurements of the water film flow rate and conductivity was used. In particular, the variation of the thickness and volume conductivity of the water film as well as the mechanisms of discharge...Show More
Potential decay on silicone rubber surfaces affected by bulk and surface conductivities
A decay of electric surface potential on a pre-charged gas-solid interface involves several charge transport processes and each of them may become dominant under certain environmental conditions (temperature, pressure, humidity). In the present paper, surface potential decay on flat samples of different kinds of silicone rubber used in HVDC applications is analyzed at reduced pressures of ambient ...Show More
Study on the influence of electrospinning coating on polypropylene surface on the electrical property
Jianhong Song;Zepeng Lv;Haipeng Li;Kai Wu;Zhiqiang Chen;Jia Wei;Fan Guo
2022 IEEE 4th International Conference on Dielectrics (ICD)
Year: 2022 | Conference Paper |
The dielectric properties of polypropylene films are an important factor restricting the performance of peaking capacitors. In order to further increase the energy storage density of peaking capacitors, it is necessary to improve the dielectric properties of the polypropylene film under nanosecond pulses. For this reason, the surface-coated polypropylene sample is prepared by the electrospinning m...Show More
Low-Cost Method for Effective Conductivity Improvement of Additively Manufactured All-Metal Waveguide Components
Jakub Sorocki;Ilona Piekarz;Michal Baranowski;Adam Lamecki;Alberto Cattenone;Stefania Marconi;Gianluca Alaimo;Nicolo Delmonte;Lorenzo Silvestri;Maurizio Bozzi
2024 54th European Microwave Conference (EuMC)
Year: 2024 | Conference Paper |
In this paper, a low-cost method of 3D printed all-metal waveguide effective conductivity improvement is proposed and studied. The approach is a combination of internal surface polishing to reduce the roughness followed by coating a high-conductivity layer through electroplating. Both methods allow to reduce total power losses within the waveguide which are impacted by the conductivity of the meta...Show More
Low-Cost Method for Effective Conductivity Improvement of Additively Manufactured All-Metal Waveguide Components
Jakub Sorocki;Ilona Piekarz;Michal Baranowski;Adam Lamecki;Alberto Cattenone;Stefania Marconi;Gianluca Alaimo;Nicolo Delmonte;Lorenzo Silvestri;Maurizio Bozzi
Year: 2024 | Conference Paper |
The mechanisms of surface charging on downsized HVDC GIL spacers coated with non-uniform conductivity
Xiaohui Chen;Chunying He;Jianyi Xue;Junhong Chen;Junbo Deng;Guan-Jun Zhang
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2020 | Conference Paper |
Surface charging phenomena on DC GIL spacers is a complicated process affected by lots of factors, among which surface conductivity is an important dielectrics parameter. In this study, experimental and theoretical research are carried out to investigate the effects of non-uniform surface conductivity on surface charge accumulation behaviours of downsized HVDC GIL spacers. A SiC/epoxy layer is par...Show More
Electric field regulation and parameter optimization of surface nonlinear conductivity spacer for 500 kV DC-GIL
In this paper, the surface nonlinear conductivity (SNC) spacer is proposed to regulate the electric field in a 500 kV DC-GIL, whose effects are verified by assigning a temperature gradient, a rough electrode, a metal particle and a polarity reversal voltage in the simulation model. The results show impressive behavior of the SNC spacer in suppressing surface charge and electric field distortion. T...Show More
Parameter Optimization of Nonlinear Conductivity Material for ±500 kV GIL Spacer
2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
Regulating the electric field distribution is one of the critical problems for the development of HVDC gas insulated transmission lines (GIL). In this study, the surface nonlinear conductivity (SNC) spacer was applied to relax the electric field distortions caused by a metal particle or a polarity reversal voltage in a ±500 kV DC-GIL. Results indicated impressive behaviors of the SNC spacer in reg...Show More
Modeling of magnetically biased graphene patch frequency selective surface (FSS)
2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)
Year: 2015 | Conference Paper |
Cited by: Papers (4)
A free-standing magnetically biased graphene patch frequency selective surface (FSS) is modelled in this paper. Its transmission coefficients of co- and cross-polarizations can be obtained with an equivalent tensorial surface conductivity. Then, the rotation angle for normal incidence is explored with different values of biasing magnetic field B0. The maximum rotation angle provided by the magneti...Show More
Surface Conductivity Investigations of Deposition Layers on VCB Ceramics
2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)
Year: 2018 | Conference Paper |
Vacuum circuit breakers (VCBs) operate for a long lifetime without service. They should still provide good making and breaking performance and dielectric strength even after many switching operations. During breaking operation, a metal vapor arc accompanies the transition to current zero. The condensation of this metal vapor occurs on the inner parts of the VCBs. For controlled condensation, VCBs ...Show More
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