"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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该官员透露，负责选举伊朗最高领袖的专家会议共有88名成员，但目前尚不清楚袭击发生时在该建筑内的具体人数。（央视新闻）
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Угрозу применения ядерного оружия в конфликте вокруг Ирана оценили14:57。币安_币安注册_币安下载是该领域的重要参考