有一个和散度定理很像的东西，当然，对于通量和div, f的二重积分，都可以使用类似的理论。
There is a similar thing with the divergence theorem, of course, with flux and double integral of div f, you can apply exactly the same argument.
方法：以丸重差异、综合质量和溶散时限为评价指标，采用正交设计试验对各影响因素进行考察。
METHODS: to take weight variation of pills, comprehensive quality and disintegration time limited as index, the above factors were observed by orthogonal test.
前言：提出实现烃类重气泄散态势的动态过程数值预测新构想———基于人工神经网络的“反求源”技术。
A technical concept, "reverse source quantity", based on artificial neural network, has been pointed out in order to carry out a numerical dynamic simulation on hydrocarbon diffusion process.
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