The work theory of parallel multi-roll straightener is first introduced in chapter two, and the key parameter's mathematical expression is acquired and simplified according to engineering application.

第二章首先介绍了平行多辊矫直机的工作原理，并推导了影响矫直效果的关键参数的数学表达式，并根据工程应用进行简化。

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On the basis of scalar diffraction theory, this paper analyses the chromatic aberration of the diffractive lenses, and obtains the mathematical expression of the dispersion of the diffractive lenses.

基于标量衍射理论，本文分析了衍射透镜的色差，首次得出了计算其色散的数学表达式。

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Methods: Using the MRI inversion recovery technology systemically in theory and get the mathematical expression of the zero signal point.

方法：从理论上对核磁共振成像反转恢复技术进行系统研究，获得零信号点的数学表达式。

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