This text analyses that earth noise and electromagnetic reasons and countermeasures penetrated emerge in the printed circuit board signal earth design of PCB.

本文分析pcb印刷电路板信号接地设计中产生接地噪声及电磁幅射的原因和对策。

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Eighteen years earlier, two Cornell physicists, Philip Morrison and Giuseppe Cocconi, had tried to imagine how an intelligent alien civilization might try to signal Earth.

十八年前，Philip Morrison和Giuseppe Coccni，两位来自康奈尔大学的物理学家，致力于猜想智慧外星文明如何向地球发出信号。

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As the probe is 320 million km away from Earth, there is a signal delay of over 10 minutes if the research team tries to control it from Earth.

由于探测器距地球3.2亿公里，如果研究小组在地球上控制探测器，会有10分钟以上的信号延迟。

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Because of the time needed for a radio signal from Earth to reach the rover -- about 14 minutes at Mars' current position -- "We don't command the rover with a joystick or a steering wheel in real time, " Tompkins said.

CNN: Mars rover captures nearby rocket 'footprint'

It takes 7 minutes for the signal to go from Earth to Mars and back again.

FORBES: Mars Probe Curiosity Is Ready To Land On Monday

To signal the end of Earth Hour at 9:30 pm the quadrocopters will reform the Star Trek logo above London's skyline.

ENGADGET: Quadrocopter fleet stuns Londoners with giant hovering Star Trek logo (video)