"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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Employees that are being laid off will get their salary for 20 weeks plus one week per year of tenure, six months of health care, and $5,000 in cash, among other benefits. But how hard will it be for them to find another job?
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图⑧：山东招远市毕郭苹果批发市场，交易火爆。