Pretreatment condition, i. e. cold or hot deformation, has important effects on microstructure evolution, and deformation of samples is a necessary step in SIMA process.

冷、热变形预处理条件对组织演变产生一定的影响，给试样施加变形是SIMA工艺的必要步骤。

youdao

In this paper, We prove that the orthogonal condition to solve the uniform asymptotic solution of second order linear P. D. E in periodic region is the necessary and sufficient condition.

本文证明了求解周期区域上的二阶线性偏微分方程的一致有效渐近解的正交条件是充分和必要的。

youdao