将沙丘背风坡的稳定性问题等价于一个双参变量函数的待定边界的泛函极值问题。
The problem of the lee slope stability of dune is equivalent to the extremal problem of a functional of two-variant function with a variable boundary in this paper.
最后，对接触流动函数及参变量的意义作了详细说明。
Finally, the flow functions and parametric variables of contact element are discussed.
提出了域参变量、域参函数等概念；
Some concepts, such as domain parameter variance and domain parameter variance function, are introduced.
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