姓名：刘瑞芳

职务/职称：教授，博士生导师

研究领域：图谱理论、代数图论、图论及其应用

邮箱：rfliu@zzu.edu.cn

简要经历

2000.09--2004.06 郑州大学 数学与应用数学 理学学士

2004.09--2007.06 郑州大学 运筹学与控制论 理学硕士

2007.09--2010.06 华东师范大学 运筹学与控制论 理学博士

2010.07--至今 郑州大学 数学与统计学院

2014.04--2014.06 香港浸会大学 数学系 访问学者

2017.12--2018.12 美国西弗吉尼亚大学 数学系 访问学者

主要项目

1.国家自然科学基金面上项目，子图存在与图的若干组合结构性质的谱刻画，2024.01-2027.12，主持

2.河南省杰青，极值图论中若干谱图兰型问题的研究，2024.01-2026.12，主持

3.国家自然科学基金面上项目，图的连通性与边不交的生成树以及正则因子的谱刻画，2020.01-2023.12，主持

4.河南省优青，图与超图的极值和谱极值理论研究，2020.09-2023.09，主持

5.郑州大学优青，图的矩阵与谱理论研究及其在多智能体系统中的应用，2015.09-2018.09，主持

6.国家自然科学青年基金，基于图的不变量与子图结构的谱极值问题研究，2013.01-2015.12，主持

7.中国博士后基金第5批特别资助，基于图的结构参数的谱极值问题研究及其应用，2012.09-2013.09，主持

8.中国博士后基金第50批面上资助，图谱理论研究中的极图问题及其应用，2011.09-2013.09，主持

获奖

1.2023年获得郑州大学“三育人”先进个人

2. 2020年获得河南省教育厅学术技术带头人

3. 2018年获得河南省优秀硕士学位论文指导教师

4. 2017年获得郑州大学优秀硕士学位论文指导教师

5. 2016年获得河南省高等学校青年骨干教师

6. 2014年获得郑州大学校级青年骨干教师

7. 2012年获得河南省优秀博士后研究人员

8. 2017年获得河南省第四届自然科学优秀学术论文一等奖

9. 2015年获得河南省第三届自然科学优秀学术论文二等奖

10.2013年获得河南省第二届自然科学优秀学术论文二等奖

学术任职

1.中国工业与应用数学学会图论组合及应用专业委员会委员

2.河南省运筹学会常务理事

3.河南省优选法统筹法与经济数学研究会常务理事

代表性论文

[1]Ao Fan,Ruifang Liu*, Guoyan Ao,Spectral radius, fractional [a, b]-factor and ID-factor-critical graphs,Discrete Mathematics 347(2024) 113976.

[2]Lu Miao,Ruifang Liu*, Jingru Zhang,The unique spectral extremal graph for intersecting cliques or intersecting odd cycles,LinearAlgebra and its Applications 689(2024) 176-195.

[3]Ruifang Liu, Lu Miao*, Jie Xue,Maxima of theQ-index of non-bipartiteC3-free graphs,Linear Algebra and its Applications 673 (2023) 1-13.

[4] Jing Lou,Ruifang Liu*,Guoyan Ao, Fractional matching, factors and spectral radius in graphs involving minimum degree, Linear Algebra and its Applications, 677(2023) 337-351.

[5] Guoyan Ao,Ruifang Liu*, Jinjiang Yuan, Spectral radius and spanning trees of graphs, Discrete Mathematics 346 (2023) 113400.

[6] Tingyan Ma, Guoyan Ao*,Ruifang Liu, Ligong Wang, Yang Hu, An improvement of sufficient condition for k-leaf-connected graphs, Discrete Applied Mathematics 331 (2023) 1-10.

[7] Jie Xue,Ruifang Liu*, Jiaxin Guo, Jinlong Shu, The maximum spectral radius of irregular bipartite graphs, Advances in Applied Mathematics 142 (2023) 102433.

[8] Mingqing Zhai,Ruifang Liu*, Jie Xue, A unique characterization of spectral extrema for friendship graphs, Electronic Journal of Combinatorics 29 (2022) P3.32.

[9]Ruifang Liu, Hong-Jian Lai*, Rao Li, Hamiltonian s-properties and eigenvalues of k-connected graphs, Discrete Mathematics 345 (2022) 112774.

[10] Guoyan Ao,Ruifang Liu*, Jinjiang Yuan, Rao Li, Improved sufficient conditions for k-leaf-connected graphs, Discrete Applied Mathematics 314 (2022) 17-30.

[11]Ruifang Liu, Hong-Jian Lai*, Litao Guo, Jie Xue, Fractional matching number and spectral radius of nonnegative matrices of graphs, Linear and Multilinear Algebra 70 (2022) 4133-4145.

[12] Jie Xue,Ruifang Liu*, Guanglong Yu, Jinlong Shu, Domination number and Laplacian eigenvalue of trees, Linear Algebra and its Applications 592 (2020) 210-227.

[13]Ruifang Liu, Hong-Jian Lai*, Yingzhi Tian, Spanning tree packing number and eigenvalues of graphs with given girth,Linear Algebra and its Applications 578 (2019) 411-424.

[14]Ruifang Liu, Hong-Jian Lai*, Yingzhi Tian, Yang Wu, Vertex connectivity and eigenvalues of graphs with fixed girth,Applied Mathematics and Computation 344-345 (2019) 141-149.

[15]Ruifang Liu*, Jie Xue, Litao Guo, On the second largest distance eigenvalue of a graph, Linear and Multilinear Algebra 65 (2017) 1011-1021.

[16]Ruifang Liu, Wai Chee Shiu*, General Randic matrix and general Randic incident matrix, Discrete Applied Mathematics 186 (2015) 168-175.

[17]Ruifang Liu, Wai Chee Shiu*, Jie Xue, Sufficient spectral conditions on Hamiltonian and traceable graphs, Linear Algebra and its Applications 467 (2015) 254-266.

[18] Huiqiu Lin*,Ruifang Liu, Xiwen Lu, The inertia and energy of the distance matrix of a connected graph, Linear Algebra and its Applications 467 (2015) 29-39.

[19]Ruifang Liu*, Huicai Jia, Jinjiang Yuan, First eigenvalue of nonsingular mixed graphs with given number of pendant vertices, Linear Algebra and its Applications 453 (2014) 28-43.

[20]Ruifang Liu*, Haixia Wan, Jinjiang Yuan, Huicai Jia, The least eigenvalue of the signless Laplacian of non-bipartite unicyclic graphs with k pendant vertices, Electronic Journal of Linear Algebra 26 (2013) 333-344.

[21] Litao Guo,Ruifang Liu*, Xiaofeng Guo, Super λ3-optimality of regular graphs, Applied Mathematics Letters 25 (2012) 128-132.

[22] Mingqing Zhai,Ruifang Liu, Jinlong Shu*, Minimizing the least eigenvalue of unicyclic graphs with fixed diameter, Discrete Mathematics 310 (2010) 947-955.

[23]Ruifang Liu, Mingqing Zhai, Jinlong Shu*, The least eigenvalue of unicyclic graphs with n vertices and k pendant vertices, Linear Algebra and its Applications 431 (2009) 657-665.

[24]Ruifang Liu, Zhonghua Lu, Jinlong Shu*, The minimal Laplacian spectral radius of trees with a given diameter, Theoretical Computer Science 410 (2009) 78-83.