"Tuning frictional behavior on the fly has been a long-standing engineering dream," said co-author Katia Bertoldi of Harvard University. "This new insight into how surface geometry governs slip pulses paves the way for tunable frictional metamaterials that can transition from low-friction to high-grip states on demand.” In addition, the dynamics revealed by these results are similar to those of tectonic faults and thus give scientists a new model for the mechanics of earthquakes, according to their new paper published in the journal Nature.
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Earlier this month, Waymo completed the first phase of testing in Nashville, Tennessee. Nashville will now see driverless taxis on its streets. Waymo testing is also underway in London, Washington DC, and Denver.，更多细节参见旺商聊官方下载
Мерц резко сменил риторику во время встречи в Китае09:25