The applications of many kinds of wavelets in the ultrasonic signal of turbine vane and wheel - hub axes are compared in discomposed effect , running speed , avoiding noise and the composition of signal . the selecting principles of wavelets applying for the aviation component ultrasonic signal processing are given . that the wavelet db4 and wavelet packages db4 are the ideal methods in analyzing the aviation component ultrasonic testing signal is validated 此外，本文从小波分解的效果，小波函数执行速度，小波降噪信噪比以及小波重构等方面，对不同小波函数在压气机叶片与轮毂轴套超声检测信号中的应用作了分析比较，给出了适合航空构件超声信号处理的小波基的选择原则，并验证了db4小波是一种比较理想的用于处理航空构件超声检测信号的分析方法。
The peak times of amylase , cmc enzyme , cellulose , laccase , guaiacol oxidase and polyphenol oxidase were the 10th day , the 12th day , the 12th day , the 14th day , the 16th day and the 16th day respectively . it indicated that phellinus igniarius has the capability of discomposing amylum , cellulose and lignose 淀粉酶、 cmc酶、纤维素酶、漆酶、愈创木酚氧化酶、多酚氧化酶的活性高峰分别出现在第10d 、第12d 、第12d 、第14d 、第16d 、第16d ，说明桑黄对淀粉类物质、纤维素类、木质素类物质均具有降解能力。
