本文在假定电弧截面温度分布的基础上，通过对电弧内部能量平衡的研究，提出了一个横向磁场中动态电弧的近似计算模型。
Based on the assuming of the arc temperature distribution and the investigation of the energy balance in the arc, a simplified model of the dynamic arc in transverse magnetic field is proposed.
研究了聚集查询重写的特征，根据数据仓库环境下聚集查询需要快速计算结果的特点，给出了一个基于聚集查询重写的快速近似计算模型。
This paper researches into the characteristic of aggregate query rewriting and gives a kind of rapidly approximate query computing model based on aggregate query rewriting under the data warehouse.
对低马赫数叶轮离散噪声的机理及计算方法进行了研究，并推导了离散噪声的声压计算式、低马赫数下近似计算式和轴心线上的计算式，还实验验证了计算模型。
Research is carried out on the discrete noise theory and calculation method, the calculation model of discrete noise and the approximate formula under small Mach number are verified by experiments.
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