目的设计一套数字化脉冲波超声多普勒系统，以实现多深度血流频谱分析和显示。
Objective To design a digital multigated PW ultrasound Doppler system and validate the system in experimental study.
研究制定了在X射线荧光光谱分析中适用于多类型地质样品的低稀释比制样技术。
A sample preparation method with low dilution factor has been applied to the analysis of geological samples by X ray fluorescence spectrometry.
介绍了两个可以用于多信号测电子科技大学博士论文频的技术：频率信道化和过零点谱分析。
Two technologies, spectral channelization and spectral analysis with zero crossing that could be both applied to multi-signals, are also introduced.
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