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利用变分原理及区域导数的定义,推导了非定常情况下不可穿透介质的 Helmholtz 方程外边值问题的区域导数,为利用区域导数重构海底形貌奠定了基础。
Using the definition of the variational principle and the regional derivatives, the region derivatives of the Helmholtz equation for non-penetrating media under non-stationary conditions are deduced, which lays the foundation for the reconstruction of the seafloor by using the region derivatives.