基于碳纤维复合材料的电容式燃油油位测量传感器

利用解析法和Ansys软件对基于碳纤维复合管材的电容式燃油油位测量传感器设计进行了计算和分析,给出了传感器的结构设计和中和电流法测量电路,实现了碳纤维复合材料在电容式油位测量中的应用。对传感器和测量系统的标定和稳定性、可靠性、高低温等试验,结果表明碳纤维复合管材电容式油位测量传感器在飞机燃油测量中的应用是可行的。

Influence and hazard of disastrous space weather on power grid in China

Based on the measured data of geomagnetically induced currents （GIC） in Guangdong Ling＇ ao 500 kV power networks during several magnetic storms at the peak years of 23rd Solar Cycle, the GIC calculation results of 750 kV planning power grid in Shartxi, Gansu, Qinghai and Ningxia, the structure and characteristics of power networks from 500 kV to 1 000 kV, and super magnetic storm in 1859 are analyzed in this paper. Through the analysis, the possible impacts of extreme space weather on the future ultra-high voltage （UHV） grid, the security of large-scale power system in China are expounded, and the research suggestions coping with the strong solar storms are proposed.

电闪何足惧 雷石不惊人——避雷针和消雷器的发明

从费城引雷实验说起 故事发生在1752年7月。一个闷热的傍晚,北美费城郊外,乌云像一顶大黑帽似的向大地铺盖而来,云层中不时闪烁着“银蛇”般的电光,传来阵阵沉闷的雷声。就在这大雷雨将要来临的时候,一个中年人带着他的儿子向旷野奔去。只见父亲手里拿着一只丝绸做的风筝,儿子手攥一卷放风筝的麻线,抬头望着乌云密布的天空,选择迎风的方向奔跑着,放起风筝来。