本文简单介绍了超声渡越时间的测量。
In this paper, the measurement of ultrasonic flight-time is briefly discussed.
渡越时间是限制晶体管高频工作能力的主要因素。
Transit time is the primary factor which limits the ability of a transistor to operate at high frequency.
采用数字相关的方法确定超声波测距中的渡越时间。
Digital correlation approach is used to find the time of flight (tof) in ultrasonic distance measurement.
介绍了渡越时间相关测量方法的基本原理与测试系统组成。
In this paper, the principle of transit time correlation method and the constitution of measurement system are presented.
并以此为基础通过线性神经网络测量流动噪声的渡越时间，进而测出流速。
The flow noise transit time estimation is given on the basis of mathematics model and linear neural networks, then the flow velocity of gas-solid two phase flow is measured.
结论：实时灰阶超声造影结合肝动静脉渡越时间能够对小肝癌进行早期诊断。
Conclusion: CEUS combined with HAVTT can significantly improve the pre-diagnosis of SHCC.
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.
之后激光高度计将参照光速，计算出反射脉冲的渡越时间，从而获得飞船与月球表面之间的距离。
From the return pulse, LOLA determines the time of flight which, accounting for the speed of light, reveals the distance from the spacecraft to the lunar surface.
由于孔径效应和孔径渡越时间的限制，传统的相控阵雷达难以在大扫描角下实现大瞬时带宽。
Due to the restriction of aperture effect and the aperture traverse delay, it is difficult for a conventional phased array radar to get wide instantaneous bandwidth under wide scan scope.
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。
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.
理论与实验研究结果表明该方法可消除渡越时间效应、湍流和采样单元内流速梯度造成的频谱模糊。
Theoretical and experimental results show that this method can eliminate the Doppler ambiguity spectra produced by transit-time effect, turbulence and velocity gradient in sample volume.
本文探讨一种以单片机为核心的两相流测量用软件相关仪中自动跟踪峰值，以确定流体渡越时间的新方法。
This paper studies a new method that determines fluid transit time by automatically tracking the peak value of the software correlation device used for measuring two-phase flow.
结果同时表明随着半导体长度的增加，电子的渡越时间并不是线性增加，而是呈现出台阶形变化的有趣结论。
The results also indicate that the traversal is not prolonged linearly as the length of the semiconductor increases but shows step-like behavior.
结果表明：随着倍增次数增多，渡越时间越大；当电压幅度不同时，增益曲线的峰值所对应的电子入射时刻也不同。
It is concluded that the time of the peak value of the gain curve varies with different voltage pulse amplitude.
但是，基于移相器的普通相控阵天线在进行宽带宽角扫描时，由于渡越时间和孔径效应的影响，使信号的瞬时带宽受限。
However, the instantaneous bandwidth of signals is restricted for general phased array because of its transition time and aperture effect.
该方法研究了幅度起伏和时间漂移条件下回波包络模型，并对模型进行了简化处理，可以更准确地计算超声波渡越时间。
This method researches the echo envelope model which has been simplified in this paper under range wave and time excursion, and can compute the transmitting time more accurately.
该方法研究了幅度起伏和时间漂移条件下回波包络模型，并对模型进行了简化处理，可以更准确地计算超声波渡越时间。
This method researches the echo envelope model which has been simplified in this paper under range wave and time excursion, and can compute the transmitting time more accurately.
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