Abstract In this paper, based on the third-order D’Alember-Lagrange principle for mechanical systems of variable mass, the third-order Lagrange’s equations of mechanical systems of variable mass have been obtained. From the equations the motion of mechanical systems of variable mass can be studied. In addition, the equations may enrich the theory of third-order differential equation.
Received: 25 September 2004
Revised: 02 January 2005
Accepted manuscript online:
Ma Shan-Jun (马善钧), Ge Wei-Guo (葛卫国), Huang Pei-Tian (黄沛天) The third-order Lagrange equation for mechanical systems of variable mass 2005 Chinese Physics 14 879
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.
