The influence of time length and beat frequency on radar range is discussed.
讨论了信号时长和差拍频率对雷达作用距离的影响；
A tunable GaAlAs diode laser is used as a chirp signal source, the distance is detected by calculating the beat frequency.
由可调谐半导体激光器产生一个啁啾信号，通过测量拍信号频率计算距离。
Brillouin enhanced four wave mixing, whose interference beat frequency drives an acoustic field, can improve the SBS phase conjugation fidelity.
采用四波混频加强SBS的方法，其相干拍频驱动声子场，能提高SBS相位共轭保真度。
Objective To investigate the effects of different concentrations of propofol on cilia beat frequency (CBF) of isolated human tracheal epithelium.
目的观察异丙酚对离体气管上皮细胞纤毛摆动频率(CBF)的影响。
Objective To investigate the effects of different concentrations of propofol on cilia beat frequency (CBF) of isolated human tracheal epithelium.
目的观察异丙酚对离体气管上皮细胞纤毛摆动频率(CBF)的影响。
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