38 citations · 43 across the 9 of their papers we have counts for
4 papers · 1 filter
On the number of limit cycles for a class of discontinuous quadratic differential systems
Xiuli Cen, Shimin Li, Yulin Zhao
The present paper is devoted to the study of the maximum number of limit cycles bifurcated from the periodic orbits of the quadratic isochronous center $\dot{x}=-y+\frac{16}{3}x^{2…
On the cyclicity of the period annulus of quadratic Hamiltonian triangle vector field
Yulin Zhao, Cuihong Yang, Xiuli Cen
This paper is concerned with the cyclicity of the period annulus of quadratic Hamiltonian triangle vector field under quadratic perturbations. This problem has been studied by Ilie…
On the structural stability of planar quasihomogeneous polynomial vector fields
Regilene D. S. Oliveira, Yulin Zhao
Denote by the space of all planar -quasihomogeneous vector fields of degree endowed with the coefficient topology. In this paper we characterize the set $Ω_{pq…
Limit cycles for planar semi-quasi-homogeneous polynomial vector fields
Yulin Zhao
This paper is concerned with the limit cycles for planar semi-quasi-homogeneous polynomial systems. We give some explicit criteria for the nonexistence and existence of periodic or…