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中国援冈比亚农业技术合作项目组供图
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Canadian actor Martin Short has said his daughter Katherine "will be remembered for the light and joy she brought into the world" following her death at the age of 42.
"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.
Пассажирский самолет развернулся над Каспийским морем и вынужденно приземлилсяСамолет «Уральских авиалиний» развернулся над Каспийским морем и сел в Сочи