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
Petroleum production logging needs to determine the interpretation models first and flow pattern identification is the foundation,but traditional flow pattern i