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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第五十六条 核进口单位未按照有关规定履行核进口承诺义务的，由国务院核工业主管部门责令改正，处二百万元以上一千万元以下的罚款；对负有责任的领导人员和直接责任人员处十万元以上五十万元以下的罚款，并依法给予处分。
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