Pedal sensor is designed for speed adjustment and synchronizer using magnetic sensors is designed for needle positioning.

同时设计脚踏板调速器实现调速功能，并设计基于磁性传感器的机头定位器实现上下停针功能。

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The main circuits of a magnetic head positioning system with a density of 8 tracks per millimeter (TPM) based on a 4 TPM system are described with the performance of the system analysed and discussed.

本文介绍了一个磁道密度为每毫米八道的磁头定位系统，该系统是将每毫米四道的系统加以改进而得。文中给出了该系统的主要电路，并对系统的性能进行了分析和讨论。

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A location mode to achieve the positioning of the micro-robot in alimentary Canal by detecting spatial magnetic field parameters was proposed.

提出通过检测永磁体空间磁场参数的变化从而实现对微型机器人在消化道的定位。

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Over the past five decades it has led to the development of the Internet, lasers, global positioning satellites, magnetic resonance imaging, DNA sequencing, and hundreds of other technologies.

FORBES: Fareed Zakaria on Innovation