Abstract In this paper the Lie-form invariance of the non-holonomic systems with unilateral constraints is studied. The definition and the criterion of the Lie-form invariance of the system are given. The generalized Hojman conserved quantity and a new type of conserved quantity deduced from the Lie-form invariance are obtained. Finally, an example is presented to illustrate the application of the results.
Received: 27 December 2005
Revised: 13 January 2006
Accepted manuscript online:
PACS:
45.50.-j
(Dynamics and kinematics of a particle and a system of particles)
Wang Jing(王静), Li Yuan-Cheng(李元成), Xia Li-Li(夏丽莉), and Hou Qi-Bao(后其宝) Lie-form invariance of non-holonomic systems with unilateral constraints 2006 Chinese Physics 15 1665
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.