Due to different wavelet threshold fit for different characteristic of signal, various wavelet de-noise threshold was used to decline the harmonics of signal and the best threshold was chosen.
由于在小波降噪中不同的阈值适应的信号特征不同，采用多种小波阈值对城市轨道交通牵引供电系统谐波信号进行降噪，并从中选择了最优的降噪阈值，达到对信号的优化处理。
The clinical features of BD was gradual decline of brainpower, orientation obstacle, characteristic changes, pseudobulbar palsy, manifestation of pyramidal and extrapyramidal motor system damages.
BD临床特征：进行性加重的智能衰退，定向力障碍及人格改变，假性延髓麻痹征，锥体系及锥体外系损害的表现。
Soil water characteristic curves in different tobacco fields decline rapidly in low suction condition and become smooth and slow while suction growing.
不同烟区的土壤水分特征曲线在低吸力时都比较陡直，随着吸力的增加特征曲线逐渐趋于平缓。
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