从位移的云纹图用位移导数法求得销钉孔中心水平截面上的应变。
The moire pattern is used to determine the strain on the horizontal section through the pinhole centre by displacement derivative method.
引入非中心差商极限概念，讨论了非中心差商极限存在与可导的关系，以及对称导数在研究函数性质方面的一些应。
The relation between noncentral difference quotients convergence and derivative was discussed by drawing the concept of noncentral difference quotients convergence in this paper.
这是一篇关于数学和物理中以导数的推广为中心交流的非正式介绍文章。
This is an informal introduction to some interactions between mathematics and physics, entered around the generalizations of derivatives.
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