Objective To study the value of pulse transit time(PTT) on the diagnosis of sleep respiratory events and microarousals.
目的评价脉搏传导时间（PTT）对睡眠呼吸暂停和微觉醒的诊断价值。
Objective Pulse transit time (PTT) is a non-invasive index which reflects changes in peripheral vascular resistance and intra-thoracic pressure.
目的PTT是一项反映周围血管阻力和胸腔内压变化的无创指标，因此和微觉醒相关的血压改变可通过PTT检测。
Experimentally, a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it, resulting in a negative transit time, and negative group velocity.
研究发现，当光脉冲通过一个原子气室时，在进入前其峰即到达出口处，造成负渡越时间和负群速。
According to the result of the measurement, the effects on beam pulse and gun design of the electron transit time between electrodes are discussed shortly.
根据束流测试结果，文章简略讨论了电子极间渡越时间对束流及枪设计的影响。
According to the result of the measurement, the effects on beam pulse and gun design of the electron transit time between electrodes are discussed shortly.
根据束流测试结果，文章简略讨论了电子极间渡越时间对束流及枪设计的影响。
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