求切平面方程的一般方法是先求切平面的法向量(借助偏导)，再用点法式写出切平面的方程。
The common method to quadric surface equation is to get the Normal Component first, and then write out the equation through dot method.
本文采用有限元法，利用压力参数法和偏导数法直接推求分块可倾瓦导轴承的动力特性系数。
The dynamic coefficients of tilting pad guide bearings are derived with the help of finite-elements using pressure parameters partial differentiation.
一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。
Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.
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