Abstract Based on the total time derivative along the trajectory of the time, we study the unified symmetry of Vacco dynamical systems. The definition and the criterion of the unified symmetry for the system are given. Three kinds of conserved quantities, i.e. the Noether conserved quantity, the generalized Hojman conserved quantity and the Mei conserved quantity, are deduced from the unified symmetry. An example is presented to illustrate the results.
Received: 29 November 2006
Revised: 11 January 2007
Accepted manuscript online:
PACS:
45.50.-j
(Dynamics and kinematics of a particle and a system of particles)
Li Yuan-Cheng(李元成), Jing Hong-Xing(荆宏星), Xia Li-Li(夏丽莉), Wang Jing(王静), and Hou Qi-Bao(后其宝) Unified symmetry of Vacco dynamical systems 2007 Chinese Physics 16 2154
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.
