The parabolic barrier, double barrier with a rectangular well, double barrier with a parabolic well structure and the potential barrier placed in an external field are discussed here.

利用该结果分别研究了抛物线型单势垒情况、方型双势垒情况、抛物线型双势垒情况以及置于外场中的双势垒情况。

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By calculation, it is proved that the solution is well suited to some rectangular plates with a free end. So, the principle of minimum potential energy with mixed variables is proved for the plates.

通过文中计算表明，混合变量的最小势能原理适用于有一个悬空角点矩形板稳定问题的求解，从而验证了它用于薄板稳定问题的一般性和通用性。

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