According to the principle of "Uniform magnetization", the field-shape of plane head quadrupole of "coil replacement" and "Quasi coil replacement" is analysed by means of series expansion.

本文根据“均匀磁化”原理，利用幂级数展开方法，对“线圈代替型”及准线圈代替型平头四极透镜的场形进行了分析。

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Real signed one of the greatest players to have ever stepped onto a football field in the shape of Hungary's Ferenc Puskas in 1958 and saw off all comers until a Bela Guttmann-inspired Benfica broke the stranglehold in 1961.

CNN: February 12, 2013 -- Updated 1220 GMT (2020 HKT)

But what matters more than this one-day snapshot of the 2012 horse race are the dynamics determining the shape of the field.

CNN: Picking Bachmann or Perry is risky for GOP

Even if Paul doesn't become the nominee, he has the potential to shape the GOP field in a way that few others can at this point.

CNN: New leader of the GOP: Rand Paul