reversal of phase

If we introduce the aperiodic or periodic reversal of the nonlinear optical coefficient into the waveguides, the CSHG conversion efficiency can be improved greatly, the configuration also has been called quasi-phase matched CSHG ( QPM-CSHG).

如果引入二阶非线性系数的周期极化反转，即考虑到准相位匹配的情况，切伦科夫倍频效率将会得到极大的提高，可以将之称为准相位切伦科夫倍频（QPM-CSHG）。

Based on the example of plug reversal braking control of reversible operation of three-phase induction motor, in different design methods, the application of PLC in the control of the three-phase induction motor is presented.

以三相异步电动机可逆运行反接制动控制为例，用不同的设计方法，阐述了PLC在控制中的应用。

A Unsteady Two-Phase Flow Model of Thrust Reversal

推力中止过程的两相流动数值模拟