A new micro-positioning control system using PZT for ultra-precision grinding was designed. The functions of this system include measure, compensate, drive, etc.

介绍了一种最新开发的面向精密磨床的压电陶瓷驱动微进给控制系统，该系统是一个驱动、检测和补偿为一体的闭环系统。

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The report calls for accelerating the use of the global positioning satellite system (GPS) in U.S. airspace and ultimately linking GPS and the air traffic control system to provide better and safer separation for planes flying in the United States.

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Among its most recent products include a watch than can receive global positioning system location information, one that doubles as a TV remote control, and one that plays MP3 digital music files.

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