The interaction of temperature gradient with internal stress profile would result in time-varyingvelocity 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。
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Forward modeling method of refraction first-break in lateral varyingvelocity media. For layered media, a new forward modeling method of refraction is presented.
The Doppler blood flow signal is inherently a nonstationary Gaussian random process whose time-frequency representation associates with the time-varyingvelocity of blood flow and its variations.