The problems in elevator door-motor system and picks up the system scheme which adopts the DC brushless motor to act as driver motor based on MSP430F149 is analysed.

详细分析了目前电梯门机系统存在的问题，提出了以MSP430F149单片机为核心，无刷直流电动机为驱动机的系统方案。

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The insulation methods of several DC systems are compared and analysed. A ping-pang variable bridge measurement is adopted. The ex - act on line detection of grounding resistance is realized.

比较分析了几种直流系统常用的绝缘检测方法，采用乒乓式变电桥测量法，实现了接地电阻的准确在线测量。

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Samuels has been fighting the battle against dangerously broad patents for some time now, recently traveling to DC to support passage of the SHIELD Act (Saving High-tech Innovators from Egregious Legal Disputes), a congressional bill that would impose heavy fines against so-called patent trolls.

ENGADGET

If Warner Bros. and DC are in the role of Superman in this long-lasting battle, then surely the Copyright Act is the Kryptonite.

FORBES: Heirs of Superman Creators Wage Epic Battle With Warner Bros.