Zobrazeno 1 - 10
of 62
pro vyhledávání: '"QIN Chengfu"'
Publikováno v:
电力工程技术, Vol 41, Iss 1, Pp 173-179 (2022)
Fuel cell electric vehicles are an important development direction of new energy vehicles. As the core energy unit of the vehicle, fuel cell performance directly affects the economy, power and reliability of the vehicle. The ejector is an important f
Externí odkaz:
https://doaj.org/article/e3f747c4508248f2859a75a62676fdb6
Let $G$ be a contraction critically quasi $5$-connected graph on at least $14$ vertices. If there is a vertex $x\in V_{4}(G)$ such that $G[N_{G}(x)]\cong K_{1,3}$ or $G[N_{G}(x)]\cong C_{4}$, then $G$ has a quasi $5$-contractible subgraph $H$ such th
Externí odkaz:
http://arxiv.org/abs/2207.13047
Let $Oct_{1}^{+}$ and $Oct_{2}^{+}$ be the planar and non-planar graphs that obtained from the Octahedron by 3-splitting a vertex respectively. For $Oct_{1}^{+}$, we prove that a 4-connected graph is $Oct_{1}^{+}$-free if and only if it is $C_{6}^{2}
Externí odkaz:
http://arxiv.org/abs/2102.07706
Autor:
Ding, Guoli, Qin, Chengfu
The chain theorem of Tutte states that every 3-connected graph can be constructed from a wheel $W_n$ by repeatedly adding edges and splitting vertices. It is not difficult to prove the following strengthening of this theorem: every non-wheel 3-connec
Externí odkaz:
http://arxiv.org/abs/2012.13974
Publikováno v:
In Discrete Mathematics November 2019 342(11):3047-3056
Publikováno v:
In Applied Mathematics and Computation 15 July 2019 353:1-6
Autor:
Qin, Chengfu, Ding, Guoli
Publikováno v:
In Journal of Combinatorial Theory, Series B January 2019 134:341-349
Publikováno v:
Discrete Dynamics in Nature & Society. 7/9/2020, p1-10. 10p.
Publikováno v:
In Applied Mathematics and Computation 1 December 2013 225:366-371