This paper reviewed the synthesis, function and current condition of second- order nonlinear optical polyimide material in recent years, and then analyzed its application prospect.
综述了近年来二阶非线性光学聚酰亚胺材料的合成、性能和现状，并对其应用前景进行了展望。
Based on the local synthesis method, the meshing behavior is optimized with the help of controllability of the second order contact parameters.
由局部综合法，利用二阶接触参数的可预控性，从而优化弧齿锥齿轮的啮合性能。
The results showed that the synthesis of butyl lactate is a second-order reaction.
结果表明，杂多酸催化合成乳酸丁酯的酯化反应为二级可逆反应。
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