目前，红细胞边缘形态的检测一般都是利用传统的边缘检测方法，如边缘临近一阶或二阶方向导数法，利用简单的方法来检测边缘。
At present, the methods of edge detection of erythrocyte are using traditional theory such as edge one-order or second-order orient differential coefficient and using simple methods to detect edge.
本文在简单介绍了有机非线性光学和极化的原理后，综述了聚合物二阶非线性光学材料的研究进展。
After a brief introduction to the principles of organic nonlinear optics and the procedures of poling, the progresses of polymeric second order nonlinear optical materials are reviewed.
二阶系统的设计极为简单，三阶系统需采用伴随因子法设计，当应用于同步电机的的励磁调节设计时，所得到的小信号性能指标能充分满足国际标准的推荐要求。
The design of 2 order system is very simple, 3 order system have to use the adjoin factor method. Based on models of these control systems, the small sign…
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