Power utilities are well ahead, not least because they can use the grid itself to collect sensor data and control switches.

供电行业远远走在了前面，主要原因是他们可以利用电网来收集传感器反馈的数据和控制伺服开关。

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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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For example, the researchers last week said they had managed to gather enough energy from a TV station a half-kilometer away to power a small temperature sensor.

例如，研究人员上周说，他们已经设法从半公里远的一座电视发射台收集了足够了能量给一个小型温度传感器供电。

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The slate comes with 512MB of RAM, 4GB of NAND storage, USB and USB On-The-Go ports, plus the standard OLPC power and sensor input ports as well.

ENGADGET: OLPC's XO 3.0 tablet hands-on (video) Hands-on

Papa Mau faced its own challenges, including long stretches of cloudy days that made it difficult for its two solar panels to collect enough energy to power its sensor arrays.

FORBES: Ocean Robot Completes Record-Setting 10,000 Mile Journey

First off, each sensor uses relatively little power.

FORBES: How Sensor Networks Add to Context