The interaction of temperature gradient with internal stress profile would result in time-varying velocity shift.
随时间变化的温度梯度与金属内部应力区的相互作用会导致超声速产生一种明显的变化。
Forward modeling method of refraction first-break in lateral varying velocity media. For layered media, a new forward modeling method of refraction is presented.
二维复杂层状介质地震折射波正演方法，该方法可适用于折射面起伏不大、低速层和折射层速度变化不大的情况。
The Doppler blood flow signal is inherently a nonstationary Gaussian random process whose time-frequency representation associates with the time-varying velocity of blood flow and its variations.
多普勒超声血流信号是一个非平稳的高斯随机过程，其时频分布与血流的速度及其变化有密切的关系。
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