换极 meaning in English

change poles
pole changing

Several kinds of the anode geometry size and the structural parameters and collocations were analyzed . the reasonable structure and operation method of the aluminum cell anodes were proposed
摘要通过对国内外几种阳极几何尺寸、配置的结构参数分析；从铝电解槽换极周期、阳极生产工艺等方面提出了铝电解槽阳极的合理结构，操作方式。
In this paper , the transitional method of the spherical har monics is applied and a new model is gained . the parameters of the new model are geocentric radius , range cross - deviation and polar is decided by different trajectories
本文对球谐函数的改进主要是采用了换极法，根据不同的弹道重新选择极点，将球谐函数变换为以地心距、射程角、侧向偏差为参数的新的形式。
With the recurrent calculation got rid of , the speed of calculation is increased . practical calculations have shown that the new model not only have the high precision but also enables us to enhance the speed of calculation 6 or 7 times . so it is testified that the new model is superior to the spherical harmonics model
通过将换极后的球谐函数用于弹道计算，得出换极后的球谐函数不仅在计算精度上可达较高要求，而且计算速度也明显优于未换极的球谐函数(新模型的计算速度是约为换极前模型的6 7倍) 。