"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.
America was mired in Vietnam abroad and civil unrest at home. But at that moment, it seemed that humanity was united.
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史蒂夫很在意自己思考的性质与质量。他对自己期待极高，并努力让思考具有罕见的生命力、优雅与纪律。他的严苛与韧性把标准抬到了令人眩晕的高度。
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Jupiter will be the easiest of the six to find, shining brightly in the constellation Gemini and high enough to stay in view for much of the night, even from light-polluted towns and cities.，这一点在同城约会中也有详细论述
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