"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.
It is a peculiarity particular to Crystal Palace that a season of such upheaval and unrest could still end up with Oliver Glasner’s side winning another trophy. Having left the pitch after last week’s first leg with supporters calling for the Austrian manager to be sacked in the morning, Maxence Lacroix and Evann Guessand made it a much more harmonious evening for Glasner and his side.，推荐阅读爱思助手下载最新版本获取更多信息
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走进克恩—里伯斯公司展厅，指甲盖大小的精密弹簧在灯光下泛着金属光泽。这家百年企业，占据着全球汽车安全带卷簧市场的重要份额。1993年，一个小小的弹簧，拉开了太仓与德企故事的序幕。