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用点集拓扑学理论，建立了形位误差评定的统一数学模型。
The unified mathematical model for evaluating geometrical errors is created with the theory of point set topology.
本文以经济电压损耗概念为基础，建立了配电网导线截面最优选择的统一数学模型。
Based on the concept of economic voltage expenditure, the unified mathematical model is established for the optimization of wire cross - section in the distribution network.
针对石墨砂型铸渗过程，提出了在碳化物析出条件下石墨砂型铸渗过程的温度场、浓度场、固相分数场统一数学模型；
The numerical model of casting carburizing process of graphite sand on the condition of carbide precipitation casting process is shown.
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