Research Interests:

• Bifurcation Theory of Differential Equations
• Biology Math

Publications:

• Ping Bi, Heying Xiao, Bifurcation for a delayed Tumor-Immune Competition System with Diffusion terms, Journal of Biomathematics(in Chinese)，2015, 30(3):569-575.
• Ping Bi, Heying Xiao, Hopf Bifurcation for Tumor-Immune Competition ?Systems with Delay , ?Electronic Journal of Differential Equations, Vol. 2014 (2014), No. 27, pp. 1-13
• Ping Bi, Heying Xiao, Bifurcations of a Tumor-Immune Competition Systems with Delays, Abstract and Applied Analysis, Vol. 2014 (2014), 14-12-15.
• Ping Bi, Shigui Ruan, Periodic and chaotic oscillations in a tumor and immune system interaction model with three delays, CHAOS, 24, No.2 (2014) ,1-16.ee delays, CHAOS, 24, No.2 (2014) ,1-16.
• Ping Bi Dezhi Li Jie Xu, On generalized model of single species population dynamics. WIT Transactions on the Built Environment,(2014 )455-461.
• Ping Bi, Shigui Ruan, Bifurcations in Delay Differential Equations and Applications to Tumor and Immune System Interaction Models SIAM Journal on Applied Dynamical Systems, Vol. 12, No. 4 (2013) 1847–1888.
• Ping Bi, Xianlong Fu, Hopf Bifurcation in an Age-dependent Population Model with Delayed Birth Process, International Journal of Bifurcation and Chaos, 22, 1250146 (2012).?
• Ping Bi, Zhixing Hu, Hopf bifurcation and stability for a neural network model with mixed delays, Applied Mathematics and Computation, Vol. 218, 12,6748-6761 (2012)．
• Zhixing Hu, Ping Bi, Wanbiao Ma, Shigui Ruan*, Bifurcation of an SIRS epidemic model with nonlinear incident rate, Disrete and continuous dynamical systems, Series B,Vol.15, No.1, Jan.93–112 (2011) .
• Ping Bi, Weipeng Zhang, Multiple Positive Periodic Solutions in a Impulsive Predator-Prey System with Type IV Functional Responses, Annals of Differential Equations, 23:4,391-399(2007).
• Weipeng Zhang, Ping Bi, Deming Zhu, Oscillations of certain second-order nonlinear differential equations with impulses, Journal of East China NormalUniversity, Vol.3 ,39-48(2007).
• Zhang Weipeng, Zhu Deming, Ping Bi, Existence of periodic solutions of a scalar functional differential equation via a fixed point theorem, Math. Comput. Modelling, 46 (5-6), 718-729 (2007).
• Weipeng Zhang, Deming Zhu, Ping Bi, Multiple positive periodic solutions of a delayed discrete predator–prey system with type IV functional responses, Applied Mathematics Letters, Volume 20, , 1031-1038(2007).
• Maoan Han, Yuhai Wu and Ping Bi, A New Cubic System Having Eleven Limit Cycles, Discrete and Continuous Dynamical Systems, Volume 12, No.4, 675–686 (2005).
• Ping Bi, Maoan Han, Existence and Bifurcation of Periodic Solutions of Three—Dimensional Delay Differential Equation, International Journal of Bifurcation and Chaos, International Journal of Bifurcation and Chaos, 14(11), 3921-3929 (2004).
• Maoan Han, Ping Bi and Dongmei Xiao, Bifurcation of Limit Cycles and Separatrix Loops in Singular Lienard Systems, Chaos, Solitons & Fractals Vol.20/3529-546(2004).
• Maoan Han and Ping Bi, Existence and Bifurcation of Periodic Solutions of High—Dimensional Delay Differential Equation, Chaos Solitons & Fractals, Volume 20, Issue 5, 1027-1036(2004).
• Maoan Han and Ping Bi , Bifurcation of Limit Cycles from a Double Homoclinic Loop with a Rough Saddle, Chin. Ann. Math., 25B(2), 233-242 (2004).
• Ping Bi, Maoan Han and Yuhai Wu, Bifurcation of Periodic Solutions of Delay Differential Equation with Two Delays, Journal of Mathematical Analysis and Applications, 284,548-563(2003).
• Ping Bi and Maoan Han, Oscillation of Second Order Difference Equations with Advanced rgument , Proceedings of the fourth International Conference on Dynamical Systems and Differential Equations. May 24-27, 2002, Wilmington, NC, USA 107-111(2002).
• Ping Bi, Qiaoluan Li, Zhenguo Zhang and Wenlei Dong, Classification of Nonoscillatory Solutions of Higher-Order Nonlinear Difference Equations. Korean J.Comput.Appl. Math, No.2, 311-324 (2001).
• Zhenguo Zhang, Ping Bi, Linear Oscillation of Second-Order Nonlinear Difference Equations with Damped Term. Comput. Math. Appl. 41, No.5-6, 659--667 (2001).
• Zhenguo Zhang, Ping Bi and Jianfeng Chen, Oscillation of Second—Order Nonlinear Difference Equation with Continuous Variable. J. Math. Anal. Appl. 255 (2001), No.1,349--357.

Funds:

National Science Foundation of China , NO.11401217(host), NO.11171110, NO. 10671069(participate).

National Science Foundation of Shanghai, NO.09ZR1408900, NO.08ZR1407000.

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