Earlier this year researchers at Intel and the University of Washington, in Seattle, showed that they could power a small sensor using a TV signal 4.1 kilometres away.

今年早些时候，英特尔及西雅图华盛顿大学的研究人员演示表明，他们能够从4.1公里以外的电视信号中获取能量来给一个小功率传感器供电。

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Differential topological characteristics of the small signal stability region (SSSR) in power systems are tentatively studied in this paper.

对电力系统小扰动稳定域的微分拓扑学性质进行了初步探讨。

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Wired remote control is a dedicated cable or power line as a carrier, the signal with modem transmission mode, to achieve a small number of channels can be used to control the method.

有线遥控是通过专用电缆或动力线作为载波体，对信号用调制解调器传输方式，达到只用少量通道即可实现控制的方法。

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Alcatel, however, will use a small radio transmitter concealed in the battery cover of the phone to transmit a coded low-power signal to the belt clip to tell it when to vibrate, a company spokesperson said after the press conference.

CNN: Technology - Alcatel personalizes vibrating phone alerts