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The role of varied metal protrusions on the conductor surfaces in corona discharge subjected to DC high voltages

Science China(Technological Sciences) 2018年第8期61卷 1197-1206页

作者： XU JiaYu XU Peng ZHANG Qian CUI Xiang BIAN XingMing LU TieBing LI HaiBing State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University

Conductor corona performance is significant in the evaluation of electromagnetic environment for high voltage power transmission lines. The influence of artificial contaminated conductors on corona discharge was studied and turned out to be complicated. The ionized field strength on the corona cage was measured by field mill. Meanwhile, photos of corona plumes were photographed and grayed to quantitate the corona discharge intensity. Subsequently, a calculation model for equivalent electric field strength coefficient was established to evaluate the discharge intensity of conductors in coaxial cylindrical electrode. It could be found the computational results achieved an agreement with the observed experimental phenomena. By means of simulation results, a reasonable explanation was given to the finding that the closer the distance between the two protrusions was, the lower the corona discharge intensity and higher corona inception voltage of the conductors would be. In summary, the distributions of corona sources played an important role in the corona discharge and this work would provide an important reference for the evaluation of corona effects on the surface of contaminated conductors.

关键词： artificial corona sources corona effects corona plumes equivalent electric field strength coefficient gray value

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Comparison of Satellite Cloud Image and Radar of Precipitation Process on July 31st,2007

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Meteorological and Environmental Research 2010年第8期1卷 55-57,104页

作者：才奎志袁子鹏孙晓巍桑明刚曲荣强南京大学大气科学学院江苏南京210009 辽宁省气象台辽宁沈阳110016

Based on the data of satellite cloud image and Doppler radar,the rainstorm process from July 31st,2007 to August 1st,2007 in Liaoning was *** precipitation in Fushun and Haicheng was more than 100 mm,and 6 h precipitation in Fushun and Dandong was more than 50 *** the analysis of strong precipitation period,the structure of clouds had a little decline from the stage of development to *** gray value and gradient degree around were both larger in the center of heavy precipitation.

关键词： Satellite cloud image Doppler radar gray value Echo intensity China

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Spatial Error Concealment Algorithm Based On Improved SUSAN Operator

Spatial Error Concealment Algorithm Based On Improved SUSAN ...

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2010 International Conference on Computer and Communication Technologies in Agriculture Engineering (CCTAE 2010)

作者： Xiaoyue LIU College of Computer and Automatic Control Hebei Polytechnic University Tangshan Hebei China Weijian CONG College of Computer and Automatic Control Hebei Polytechnic University Tangshan Hebei China

In the transmission of real-time video compressed streams,error concealment method is to restore the damaged or lost data *** paper improves the existing spatial error concealment algorithm based on SUSAN detection *** the one hand,as recovering the error,the detection pixels were reduced by considering the relationship of nearby *** the other hand,more associated pixels were fully *** experimental results show that the proposed algorithm enhances the Peak Signal to Noise Ratio in the case of reducing 4%-8% computational complexity,and is more beneficial to real-time application.

关键词： SUSAN operator error recovery edge detection gray value

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