The features and applications in superprecision turnings of piezoelectric ceramic inching motion devices are introduced.

介绍了压电陶瓷动机构的性能特点精密车削加工中的多种用途。

The Microtremor Survey Method use Microtremor observation to distill surface wave, obtain it's dispersion curve and then get inversion to the underground structure.

动勘法是通过野外设置一个观测台阵动信号,然后从观测到的动信号中提取面波,得到面波的频散曲线,最后用频散曲线反演地质结构。