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High-speed footage reveals shoe squeaks can start with a tiny bolt of lightning — plus, evidence that a debated brain phenomenon exists in humans.
"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.，这一点在爱思助手下载最新版本中也有详细论述