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Liu C.,Northeastern University China | Liu C.,State Key Laboratory of Integrated Automation of Process Industry | Zhang Q.,Northeastern University China | Zhang Q.,State Key Laboratory of Integrated Automation of Process Industry
Chinese Control Conference, CCC | Year: 2015

In this paper, we investigate a nonautonomous two prey-one predator system with stage structure for each species. Interspecific competition between mature dominant prey and mature sub-dominant prey species are considered, and three discrete time delays are incorporated into the model due to maturation time for sub-dominant prey, dominant prey and predator species, respectively. By using differential system theory and comparison arguments, an iterative technique is proposed to discuss permanence of periodic solutions. Numerical simulations are carried out to show consistency with theoretical analysis obtained in this paper. © 2015 Technical Committee on Control Theory, Chinese Association of Automation. Source


Zhao Y.,Northeastern University China | Zhao Y.,State Key Laboratory of Integrated Automation of Process Industry | Lv R.-Q.,Northeastern University China | Li H.,Northeastern University China | Wang Q.,Northeastern University China
IEEE Transactions on Magnetics | Year: 2014

Microstructure of magnetic fluid under the applied external magnetic field was simulated by the Monte Carlo method, which could be used to research the transmission characteristics of the magnetic fluid film. Transmittance of a 10 μm magnetic fluid film at the 1550 nm wavelength was obtained by tracing the path of a single photon in the film, which could be explained by the phenomenon of microstructure change with various applied magnetic fields. Moreover, the transmittances were measured in the experiment when the light direction was, respectively, parallel and perpendicular to the direction of the applied magnetic field. Maximum errors between the experimental and simulation results are ±8.3% and ±4.4%, respectively, for the above two different cases. In summary, transmittance of magnetic fluid will increase with the increasing of magnetic field intensity when light is parallel to the magnetic field, while transmittance will reduce at first, and then increase with the increasing of the magnetic field intensity when the light is perpendicular to the magnetic field. © 2013 IEEE. Source

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