The physical foundation of the ultrasonic waves is presented. A contactless ultrasonic sensor in seam tracing is developed.

介绍了超声波的物理基础，研制了焊缝跟踪中的非接触超声波传感器。

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The distortion mainly comes from two mechanisms: the nonlinearity of the lattice potential and the interaction between the ultrasonic waves and dislocations.

波形畸变主要来自两个方面：固体中晶格原子之间作用力的非线性以及固体中位错和超声的非线性相互作用。

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The experimental result shows that the ultrasonic waves speed, strength and destroy type is different to rock direction, but the aver- age modulus is the same.

试验结果表明，超声波速度、岩样的强度以及破坏形式具有明显的方向性，而平均杨氏模量随方向的变化不很显著。

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MRI, Dr Giorgio employed an ultrasonic scanner to help him guide the device which generated the radio waves to its target.

ECONOMIST: Thermal treatments of cancer are remarkably effective