The displacement functions of infinite soil piece are given as the product of analytical functions in vertical and radial directions and piecewise polynomial in the angular direction.

无限延伸的土体介质片的位移函数沿竖向及径向取用解析函数，而沿周向采用分片多项式。

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That flip transfers angular momentum to the domain wall, pushing it along in the direction of the current.

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