本文证明了直边八节点修改等参元的等参坐标变换与单元附加节点的总体配置无关；
It is shown in this paper that the isoparametric coordinate transformation is independent of the lacotion of the additional nodes for straight-side eight-node modified isoparametric element.
通过采用推挽变压器和两个附加的二极管，该变换器可以实现零电压开关，并且有较高的可靠性。
By using two additional diodes and a push-pull transformer, this converter achieves not only ZVS of all active switches but also high reliability.
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