High-speed imaging reveals that the squeak of soft–rigid frictional interfaces, like sneakers sliding on a basketball court, arises from intersonic opening slip pulses—analogous to earthquake ruptures—that thin ridges on the rubber confine to repeat at a musical frequency.
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第二节 妨害公共安全的行为和处罚
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In experiments, Chagger has documented how lithium-ion battery fires develop. "It's just incredible," he says. "Nothing's happening, then: outgassing and boom-boom-boom – all these explosions."