The L F signals are transformed by entropy based on wavelet packet algorithms for best basis selection, and the results are displayed in time- frequency space namely phase plane.
该方法采用基于熵的小波包最佳基选取准则，对局部损伤信号进行自适应小波包分解，将分解结果显示于时—频空间即相平面上。
Method :Platycodon grandiflorum, Aster tataricus L. f, Radix stemonae in were identified by TLC.
方法：采用薄层色谱法对制剂中桔梗、紫菀、百部分别进行定性鉴别。
Results:Platycodon grandiflorum, Aster tataricus L. f, Radix stemonae in could be identified by TLC.
结果：在薄层色谱中均能检出桔梗、紫菀、百部。
Effects of rolling and drying technologies on quality of persimmon Diospyros kaki L. f. var. Sylvestris Makino CV.
研究了揉捻和不同干燥方法对安溪油柿叶茶品质的影响。
Fitting of relaxation modulus master curve for solid propellant and W. L. F. equation parameters.
推进剂松弛模量主曲线及W.L.F。方程参数的拟合处理。
F. assemblies of fuzes. The system consists of a microcomputer system, a special interface device, an assembling plate for fuze L. F. assemblies.
该系统由一个微型计算机系统、一个专用的接口仪器和一个引信低频部件装配板组成。
L. f. noise can be better attenuated so as to obtain good attenuation characteristics over the entire audible frequency range by using active noise reduction technique in the closed-air type earmuff.
在密闭型耳罩中，利用有源降噪技术可以较好地衰减低频噪声以使整个可听声频率范围内获得良好的衰减特性。
L. f. noise can be better attenuated so as to obtain good attenuation characteristics over the entire audible frequency range by using active noise reduction technique in the closed-air type earmuff.
在密闭型耳罩中，利用有源降噪技术可以较好地衰减低频噪声以使整个可听声频率范围内获得良好的衰减特性。
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