Jianfeng Zhao

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Compared with the three-phase, two-split-capacitor active power filter (3P2C-APF), the three-phase, four-leg active power filter (3P4L-APF) has been widely used in three-phase, four-wire grid utility for power quality control due to its numerous advantages, such as higher current output capability, particularly in phase N, lower current and easier voltage(More)
A pair of new phenolic acid stereoisomers, (R)-norsalvianolic acid L (1) and (S)-norsalvianolic acid L (2), was isolated from the Danshen Injection (lyophilized powder). The structural elucidation and stereochemistry determination were achieved by spectroscopic and chemical methods including 1D, 2D NMR (1H-1H COSY, HSQC and HMBC) and circular dichroism(More)
The article through the analysis of time domain and frequency domain to the radar non-contact life-parameter signals and gain its characteristics of extremely low frequency, low SNR, and the easy submerged in strong clutter noise. This paper presents the algorithm of dynamic life signal detection based on Elman neural network. The practice shows that the(More)
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