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"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.。快连下载安装是该领域的重要参考
时间回到2004年2月，主政一方的习近平同志参加中央党校省部级主要领导干部专题研究班。
Analysts say a tie-up could offer benefits to the struggling traditional pay TV networks as well, giving them greater clout in business negotiations and presenting opportunities for cost savings.