This paper investigates the minimal-energy driving problem for high-speed electric train,and then proposes a three-stage optimal strategy.First,a switching syst
The Hosoya index of a graph is defined as the total number of the matching of the graph. In this paper,the ordering of polygonal chains with respect to Hosoya i
The Shangcheng stout salamander (Pachyhynobius shangchengensis) is a poorly known stream dwelling hynobiid salamander from China.We studied the reproduction,dev