periodical analysis
1.To study the periodical electromagnetic pulses with random timing jitter radiated by electromagnetic pulse transmitters, the PSD (power spectral density) of periodical electromagnetic pulses with random timing jitter was obtained based on the analysis of the δ-function of the PSD of timing jitter.
2.Based on analysis of the spectrum of constant frequency PWM, periodical frequency-spreading PWM and chaotic frequency-spreading PWM, mechanism and characters of the chaotic PWM of converter for EMI suppressing were discussed.
3.Quality analysis for Marine Fisheries Research (2001~2005) showed that this journal has a high mean paper ratio of more than 80% in funded theses and excellent publication time lag but poor yearly information content. The periodical has been collected by several domestic databases and abstracted and by external ZR and ASFA but it has not entered the six world famous retrieval systems.
