We derived a set of mathematical formulas for describing the third-order nonlinear optical process in polydiacetylene crystals.
我们建立了一套描述聚丁二炔晶体中的三阶非线性光学过程的数学公式。
As sinter is a typical time varying and nonlinear system with large delay time, it is difficult to describe the whole process using a mathematical model.
烧结是一个典型的时变、非线性、大滞后的系统，很难用一个确定的数学模型去描述整个过程。
Based on a typical time varying and nonlinear system with large delay time, it is difficult to describe the whole process using a mathematical model.
基于复杂工艺过程的时变、非线性、大滞后的系统，很难用一个确定的数学模型去描述整个过程。
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