A self similar characteristic function is provided to quantitatively investigate self similarity of AE process.

给出定量考察声发射过程的自相似性特征函数.

Characteristic function is used for color classification, which can reduce the operation of color coordinate conversion and improve the speed of color classification.

颜色分类处理使用特征函数，可以减少颜色坐标转换运算，提高颜色分类速度。

Thus, developing some membrane materials with special characteristic function is the key to application of separation membrane technology in wastewater treatment.

因此开发具有某些需要的性能的膜分离材料是解决水污染治理中膜分离技术应用问题的关键。