Those electronic speed limit signs can see how fast you're going without a camera: Here's how

Electronic speed limit signs can be a helpful reminder to slow down on the road, but without knowing how they work, the ...
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Alternating current can reduce friction by redistributing electronic density at material interfaces

A research team led by Prof. Tian-Bao Ma from the Department of Mechanical Engineering at Tsinghua University has proposed a novel strategy to reduce friction and wear by inducing dynamic electronic ...