提出了一种分析不对称外挂对飞机颤振影响的方向导数法。
A direction derivative method for the analysis of the effects of asymmetric stores on flutter speed is presented.
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.
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