Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.
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Bigger, better, bolder is the message being touted about the first of this year's London fashion weeks.
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李强表示，过去一段时间以来，世界经济的不稳定不确定性总体在上升。中德作为世界两大经济体，通过持续紧密合作，既为各自发展拓展了空间，也为世界经济注入了动能。当前，世界经济仍然面临着较大挑战，单边主义、保护主义在一些国家和地区抬头甚至盛行，使国际经贸秩序遭到严重破坏。越是形势严峻，中德越应当加强合作。唯有合作，才是我们应对风险的最优解；唯有发展，才是我们保障安全的必选项。
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