文中介绍了一种新型环保绝缘气体六氟丙烯(1-C_(3)F_(6)),并重点研究了1-C_(3)F_(6)与CO_(2)混合气体在不同电极结构和电压特性下的绝缘特性。研究表明:在均匀电场中,1-C_(3)F_(6)/CO_(2)混合气体的50%击穿电压随着电极间距、气压的增...文中介绍了一种新型环保绝缘气体六氟丙烯(1-C_(3)F_(6)),并重点研究了1-C_(3)F_(6)与CO_(2)混合气体在不同电极结构和电压特性下的绝缘特性。研究表明:在均匀电场中,1-C_(3)F_(6)/CO_(2)混合气体的50%击穿电压随着电极间距、气压的增加而增加,工频击穿电压随着充气压力的升高而近似线性升高,纯1-C_(3)F_(6)气体在1.25 bar(1 bar=100 k Pa)时的工频击穿电压与SF_(6)接近。此外,在各个充气压力下,1-C_(3)F_(6)/CO_(2)混合气体的工频击穿电压都比C_(5)F_(10)O/Air混合气体高。在稍不均匀电场中,1-C_(3)F_(6)/CO_(2)混合气体直流和工频击穿电压随着充气压力的升高而升高,表现出较好的线性度。在极不均匀电场下,1-C_(3)F_(6)/CO_(2)混合气体工频击穿电压随着充气压力的升高而缓慢升高,逐渐趋于饱和。文中的试验结果可以为电力产品设计提供参考和依据。展开更多
CuO nanowire arrays were prepared by oxidation of copper nanowires embedded in anodic aluminum oxide （AAO） membranes. The AAO was fabricated in an oxalic acid at a constant voltage. Copper nanowires were formed in t...CuO nanowire arrays were prepared by oxidation of copper nanowires embedded in anodic aluminum oxide （AAO） membranes. The AAO was fabricated in an oxalic acid at a constant voltage. Copper nanowires were formed in the nanopores of the AAO membranes in an electrochemical deposition process. The oxidized copper nanowires at different temperatures were studied. X-ray diffraction patterns confirmed the formation of a CuO phase after calcining at 500 ？C in air for 30 h. A transmission electron microscopy was used to characterize the nanowire morphologies. Raman spectra were performed to study the CuO nanowire arrays. After measuring, we found that the current–voltage curve of the CuO nanowires is nonlinear.展开更多
文摘文中介绍了一种新型环保绝缘气体六氟丙烯(1-C_(3)F_(6)),并重点研究了1-C_(3)F_(6)与CO_(2)混合气体在不同电极结构和电压特性下的绝缘特性。研究表明:在均匀电场中,1-C_(3)F_(6)/CO_(2)混合气体的50%击穿电压随着电极间距、气压的增加而增加,工频击穿电压随着充气压力的升高而近似线性升高,纯1-C_(3)F_(6)气体在1.25 bar(1 bar=100 k Pa)时的工频击穿电压与SF_(6)接近。此外,在各个充气压力下,1-C_(3)F_(6)/CO_(2)混合气体的工频击穿电压都比C_(5)F_(10)O/Air混合气体高。在稍不均匀电场中,1-C_(3)F_(6)/CO_(2)混合气体直流和工频击穿电压随着充气压力的升高而升高,表现出较好的线性度。在极不均匀电场下,1-C_(3)F_(6)/CO_(2)混合气体工频击穿电压随着充气压力的升高而缓慢升高,逐渐趋于饱和。文中的试验结果可以为电力产品设计提供参考和依据。
基金supported by the State Key Development Programfor Basic Research of China(No.G2500CB6236057)
文摘CuO nanowire arrays were prepared by oxidation of copper nanowires embedded in anodic aluminum oxide （AAO） membranes. The AAO was fabricated in an oxalic acid at a constant voltage. Copper nanowires were formed in the nanopores of the AAO membranes in an electrochemical deposition process. The oxidized copper nanowires at different temperatures were studied. X-ray diffraction patterns confirmed the formation of a CuO phase after calcining at 500 ？C in air for 30 h. A transmission electron microscopy was used to characterize the nanowire morphologies. Raman spectra were performed to study the CuO nanowire arrays. After measuring, we found that the current–voltage curve of the CuO nanowires is nonlinear.
文摘利用高性能数字示波器、发射光谱法以及热力学方法,对直流双阳极等离子体发生器的伏安特性、射流的温度与射流的比焓特性进行了实验研究.结果表明,当等离子体的工作气体为纯氩气时,其弧压随电流的增加显著升高,且不随气体流量的增加而单调地变化;当工作气体为氩氮混合气体时,弧压随氮气的比例增加而急剧增大;氩等离子体射流的比焓随着电流的增大而增大,随着氩气流量的增加而减少;在相近的条件下氩氮等离子体射流的比焓远大于纯氩等离子体射流的比焓;氩等离子体射流在出口处的温度超过10000 K.
