... 二阶曲面：quadric surface 二阶偏微分方程：second order partial differential equation 二阶加托微分：second Gateaux differential ...
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列出二阶偏微分方程，采用一维方法求解得到了磁场、涡流的解析表达式。
Second order partial differential equations were given. They were solved by one-dimension method and analytical solutions for magnetic field and eddy current were obtained.
详细推导了在极坐标系下的谱元方法的具体计算公式，求解了极坐标系下的简单椭圆型二阶偏微分方程；
The formulas of the spectral element method in polar coordinate are induced and described in detail. Spectral element method is a high-order weighted residual technique.
考虑用二阶复合型偏微分方程所描述的分布参数系统，研究了它的一个使平方性能指标达到最小值的边界最优控制问题。
Consider the distributed parameter system described by the second order partial differential equation of composed type, we discuss its a boundary optimal control problem with quadratic performance.
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