Figure 1
From: Positive periodic solution for Nicholson-type delay systems with impulsive effects
The dynamic behavior of the system ( 4.1 ) with the initial condition ( 4.2 ). (a) Time-series of the \(y_{1}\), \(y_{2}\) of system (4.1) without impulsive effects for \(t\in[0,20]\). (b) Phase portrait of solutions of system (4.1) without impulsive effects for \(t\in[3,20]\). (c) Times-series of the \(y_{1}\), \(y_{2}\) of impulsive system (4.1) for \(t\in[0,20]\). (d)Â Phase portrait of solutions of impulsive system (4.1) for \(t\in[5,20]\).