个人简历
Education
1999.9---2003.7： Nankai University, B.S. in Mathematics.
2004.8---2009.12： Brigham Young University, Ph.D in Mathematics. Advisor: Prof. Tiancheng Ouyang.
Working Experience
2009.9---2011.7： Nankai University, Chern Institute of Mathematics,Postdoc, supervisor: Prof. Yiming Long.

2011.7-2015.7： Beihang University, School of Mathematics and System Sciences,Lecturer.

2015.7-Now: Beihang University, School of Mathematics and System Sciences,Associate Professor.
Research Interest
Hamiltonian System, Variational method, Celestial mechanics, Index theory
Research Fund
June 2011---July 2012： Postdoc fund;
Jan. 2012---Dec. 2014： Young Scientist Fund of NSFC;
Mar. 2012---Dec. 2012： Beihang Haiyou Project;
Jan. 2019---Dec. 2022： NSFC Fund.


Publications

20. Kuang, Wentian; Yan, Duokui;Existence of prograde double-double orbits in theequal-mass four-body problem,Advanced Nonlinear Studies, 2018,(18):819--843;
19. Yan, Duokui;Action minimizers under topological constraints in theplanar equal-mass four-body problem, Journal of Differential Equations, 2018, (264): 4764--4805;
18. Liu, Rongchang; Li, Jiangyuan; Yan, Duokui;New periodic orbits in the planar equal-mass three-body problem, Discrete and Continuous Dynamical Systems -Series A, 2018, (38): 2187--2206;
17. Han, Shaoqi; Huang, Anping; Ouyang, Tiancheng; Yan, Duokui; New periodic orbits in the planar equal-mass five-body problem, CommunicationsinNonlinearScienceandNumericalSimulation, 2017, (48): 425--438;
16. Shi, Bixiao; Liu, Rongchang; Yan, Duokui; Ouyang, Tiancheng; Multiple periodic orbits connecting a collinear configuration and a double isosceles configuration in the planar equal-mass four-body problem, Advanced Nonlinear Studies, 2017, (17) : 819--835;
15. Ouyang, Tiancheng; Yan, Duokui;Variational properties and linear stabilities of spatial isosceles orbits in the equal-mass three-body problem, Discrete and Continuous Dynamical Systems - Series A, 2017, (27): 3989--4018；
14. Peng,Hao; Yan, Duokui; Xu,Shijie; Ouyang,Tiancheng; Linear stability of double-double orbits in the parallelogram four-body problem, Journal of Mathematical Analysis and Applications, 2016, (433): 785--802;
13. Chang, Xiaojun; Ouyang, Tiancheng; Yan, Duokui; Linear stability of the criss-cross orbit in the equal-mass three-body problem, Discrete and Continuous Dynamical Systems - Series A, 2016, (36): 5971--5991；
12. Yan,Duokui;Liu,Rongchang; Hu,Xingwei; Mao,Weize; Ouyang,Tiancheng; New phenomena in the spatial isosceles three-body problem with unequal masses, International Journal of Bifurcation and Chaos, 2015, (25): **;

11. Yan, Duokui;Ouyang,Tiancheng; New phenomena in the spatial isosceles three-body problem, International Journal of Bifurcation andChaos, 2015, (25): **；
10. Ouyang,Tiancheng; Yan,Duokui; Simultaneous binary collisions in the equal-mass collinear four-body problem, Electronic Journal of Differential Equations,2015, (80): 1--34；

9. Yan,Duokui; Liu, Rongchang; Chang, Geng-zhe;A type of multiple integral with log-gamma function, Involve, 2015, (8): 593--614;

8. Yan, Duokui; Ouyang, Tiancheng; Xie, Zhifu; Classification of periodic orbits in the planar equal-mass four-body problem, Discrete and Continuous Dynamical Systems –Special Issue,2015: 1115--1124;

7. Yan, Duokui; Existence of the Broucke periodic orbit and its linearstability, Journal of Mathematical Analysis and Applications, 2012, (389): 656--664;

6. Yan,Duokui; A simple existence proof of Schubart periodic orbit with arbitrary masses, Frontiers of Mathematics in China, 2012, (7): 145--160;

5. Yan,Duokui; Existence and linear stability of the rhomboidal periodic orbit in the planar equal mass four-body problem，Journal of Mathematical Analysis and Applications, 2012, (388): 942--951;
4. Ouyang,Tiancheng; Simmons,Skyler C.; Yan,Duokui; Periodic solutions with singularities in two dimensions in the n-body problem, Rocky Mountain Journal of Mathematics, 2012, (42): 1601--1614;
3. Ouyang,Tiancheng; Yan,Duokui; Periodic solutions with alternating singularities in the collinear four-body problem, Celestial Mechanics andDynamical Astronomy,2011, (109): 229--239;
2. Bakker,Lennard F.; Ouyang,Tiancheng; Yan,Duokui; Simmons,Skyler; Existence and stability of symmetric periodic simultaneous binary collision orbits in the planar pairwise symmetric four-body problem, Celestial Mechanics and Dynamical Astronomy, 2011, (110):271--290;
1.Bakker, Lennard F.; Ouyang,Tiancheng; Yan,Duokui;Simmons,Skyler; Roberts, Gareth E.; Linear stability for some symmetric periodic simultaneous binary collision orbits in the four-body problem, Celestial Mechanics and Dynamical Astronomy, 2010, (108): 147--164.

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