Mathematical model is a base of solving quantitatively environmental pollution control.

数学模型是定量解决环境污染控制问题的基础。

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A mathematical model of liquid nitrogen system of a space environmental simulator is introduced and a quasi-stationary control method is developed in this paper.

大型空间环境模拟器的液氮系统庞大复杂，为满足确定控制方案、建立故障诊断模型、技术改造等的需要，建立液氮系统的数学模型是十分必要的。

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A mathematical model of optimum impounded level considering environmental risk is established based on it.

在此基础上，建立了水利工程考虑环境风险的蓄水位优选模型。

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But soon after, I developed a novel mathematical model which can be used by doctors and environmental specialists to quantify the effect of the pollutants on the lung function as measured by the peak expiratory flow rate-- which is essentially how much a person can breathe out in one breath.

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