According to the frequency excursion in power systems, this paper proposes a detecting method of harmonic negative current instructions.

针对电网出现的频率偏差，提出一种谐波负序电流指令的检测方法。

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After an explosion in Apollo 13's service module cut off propulsion and power, the lunar excursion module (LEM) was used as a lifeboat to provide life support to the three astronauts, and the engine of its descent stage for course changes, until the command module could re-enter the atmosphere after a long coast around the moon.

MSN: Salvaging Science from Stricken Mars Moon Probe: A Scientist's View - Technology & science - Space - Space.com | NBC News

Joseph Finder's latest corporate thriller, Power Play, is a finely crafted excursion into the dark heart of executive-suite skullduggery, this time set in an aerospace company.

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