Methods By using the ultrasound pulse reflection law, the correlation between the process of thrombosis formation and changes in the ultrasonic velocity was studied quantitatively.

方法采用超声脉冲反射法，着重就血栓形成过程中对其声速变化的相关性进行了定量研究。

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Acoustic velocities of tap water and polymer solution were studied using ultrasonic-pulse reflection method in the laboratory. Polymer density and apparent viscosity were measured.

采用脉冲反射法在实验室条件下对自来水和不同浓度聚合物溶液的声速进行了测量研究，经测量得到了聚合物溶液的密度、表观粘度。

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The automatic testing method of cable fault is characterized by that the pulse signal transmitted and received by pulse reflection test circuit can be directly superposed on the output end of d.

电缆故障的自动测试方法，其特征在于是将脉冲反射测试电路发射与接收的脉冲信号直接叠加到直流高压测量电路的输出端，直流高压测量电路的输出端与被测电缆端口连接。

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By measuring how long that pulse takes to return, it can place the distance to the point of reflection to within that level of accuracy enough to tell whether an aircraft's wing-flaps are up or down.

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