To hence calculation precision, the leakage should be considered, and the leakage coefficients of permanent field and excited one are calculated separately by 2-d FEM of the magnetic bearing.

为精确计算磁轴承性能，需考虑漏磁的影响，通过分析该磁轴承的二维磁场，分别计算出永磁磁场和电励磁磁场的漏磁系数。

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And water would be all the more exciting on Ganymede because it is the largest moon in the solar system (larger even than the planets Mercury and Pluto) and, like earth, it has a permanent magnetic field that protects part of its surface from bombardment by certain sorts of life-destroying radiation.

ECONOMIST: Blue moon

The travellers applied for 10 permanent pitches on a field in Eaves Green Lane.

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Mr. Kohler is one of many 20-somethings who've cobbled together a few jobs to both pay the bills and gain more experience as they pursue a more permanent role in their field of choice.

WSJ: Make a Second Job Work for You