Gravity gradient is the second order derivative of gravitational potential, which can be observed by satellite gradiometer.

摘要重为重位的二阶导数，可以通过星载仪进行观测。

In this chapter, we partially solve the problem of inner radius of univalence for some parallelogram, applying the properties of extremal sets of Schwarz derivatives.

在这一章中我们利用Schwarz 导数极值集的重要性质部分的解决了几类平行四边的单叶性内径。

The large deflection problem of cantilever beams was studied by means of the biparametric perturbation method and the first order derivative substitution from pseudolinear analysis approach.

利用拟线性分析法中的一阶导数代换对基本进行了简化处理,将基本的微分积分转化为非线性代数,并结合双参数摄动研究了悬臂梁的大挠问题。