Abstract The Lie-form invariance of a nonholonomic mechanical system is studied. The definition and criterion of the Lie-form invariance of the nonholonomic mechanical system are given. The Hojman conserved quantity and a new type of conserved quantity are obtained from the Lie-form invariance. An example is given to illustrate the application of the results.
Received: 18 October 2005
Revised: 04 November 2005
Accepted manuscript online:
Xia Li-Li (夏丽莉), Wang Jing (王静), Hou Qi-Bao (后其宝), Li Yuan-Cheng (李元成) Lie-form invariance of nonholonomic mechanical systems 2006 Chinese Physics 15 467
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.