In this paper a method for calculating risk of exceeding criterion(REC)in river was put forward on the basis of mathematical simulation analysis(MSA) for toxicants'leaking behaviour.

在对有毒物质河流泄漏行为进行数学模拟分析的基础上，提出了一种计算河流断面超标风险的方法。

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The mathematical modeling, dynamic simulation and its strength analysis of the new stirring kneader are the center contents of this paper.

新型搅拌捏合机的数学模型建立、动态模拟及其强度分析均是本文研究的主要内容。

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First the establishment of mathematical model for the FCFS process scheduling algorithm, then theoretical analysis on the model and last experimental simulation.

本文先建立了FCFS进程调度算法的数学模型，再对模型先进行理论分析和实验模拟。

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