Filtered process mathematical model includes material balance equations of solid filter material and liquid sewage respectively.
污水过滤过程的数学模型包括固体滤料相和液体污水相的物料衡算方程。
In this paper, a set of differential equations of an undersaturated oil reservoir in a finite aquifer system is established for the first time based on the material balance principle.
本文首次建立了有限含水层未饱和油藏物质平衡微分方程组。
According to the character of the surfaces of a propagating crack, the balance equations are material rate equations.
根据扩展裂纹表面的特征，平衡方程是实质率型方程。
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