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Electrically polarized ceramics are classified as electrets, when ions are displaced or dipole moments are aligned in a direction for a considerable period due to an external electric force. An electret can independent irradiate an electrostatic force to the surrounding constituents. As briefly mentioned above, polarization takes place due to the off-centered displacement of cations and anions in...
The space charge distributions of different ZnO varistors have been investigated using pulsed electro-acoustic (PEA) method in this paper. There were 8 kinds of ZnO varistors samples sintered under 4 different sintering temperatures with two formulas. According to the experimental results, it was found that there is space charge distribution when the sample is applied with a DC voltage, and the space...
To research the effect of temperature and humidity on corona inception voltage gradient of UHV DC transmission line, a mini corona cage has been constructed and put in a manual environment room, which temperature and humidity can be controlled. At the same time, a corona inception voltage gradient measuring system by using vary methods such as current impulse method, acoustic method have been set...
To research the effect of high altitude on corona performance of UHV DC transmission line, the corona inception voltage gradient of a copper line at different air pressure level from 101 kPa to 61 kPa was measured in a mini corona cage. The results have been compared with calculated results of Peek law and the corona inception voltage gradient correction factor of air pressure was presented.
In this paper, the processes associated with the electrodeposition of Selenium on Au substrates from nitric acidic solutions were investigated by combined electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) measurements. The analyses reveal that H2SeO3 in the solution is firstly adsorbed on the surface of Au electrode during cathodic polarization and subsequently reduced to Se...
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