"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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「在我被抓之前，我在美國生活的這幾年，我就是很低調、默默獨自生活，很多時候遇到有問題我都是自己面對、自己解決，我都盡量不去求別人來幫我。」，推荐阅读WPS官方版本下载获取更多信息
14:21: Video evidence obtained by the BBC shows police firing at protesters from inside the parliamentary complex. We have been able to establish that police fired seven shots at the crowd.
A tribute to Brigitte Bardot at the Césars, France’s version of the Oscars, on Thursday was greeted with boos. In a video clip posted by Paris Match, boos can clearly be heard among the applause as the tributes, and a shout of “racist!” is also audible.