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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德国电气与电子行业协会2月23日公布的最新数据显示：2025年德国电气与电子行业出口额达2575亿欧元，同比增长5.1%，创下历史新高。该行业前十大出口目的地中，除美国、中国外，其他均为欧洲国家，对欧洲市场的出口全部实现增长，其中对波兰出口增长17.7%，对西班牙出口增长15.9%。德国电气与电子行业协会主席冈瑟·凯格尔表示，历经3年停滞与下滑后，德国电气和数字产业发展已逐步趋于稳定。。搜狗输入法下载对此有专业解读
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