Doppler frequency shift observation of ionospheric high frequency echo is an important method for studying ionospheric disturbances.
电离层高频反射回波的多普勒频移观测是研究电离层扰动的一个重要方法。
2
Methods The blood supply of transferred pedicle skin flap was observed with colorful Doppler, skin thermometer and clinical observation and give a suggestion about the indication.
方法应用彩色多普勒、皮温计和临床观察方法监测带蒂皮瓣转移血流变化，提出带蒂皮瓣早期断蒂的客观指标。
3
Methods: we examined 80 patients with primary hypertension by Transcranial Doppler (TCD) and electroencephalogram (EEG), then we did statistics and observation.