This paper investigates the synchronization and circuit implementation of a new hyperchaotic Lorenz system. This system is generated by controlling a generalized Lorenz system to hyperchaotic by introducing a linear s...This paper investigates the synchronization and circuit implementation of a new hyperchaotic Lorenz system. This system is generated by controlling a generalized Lorenz system to hyperchaotic by introducing a linear state feedback controller to its scored equation. Global synchronization of the new hyperchaotic systems can be achieved by unidirectonally linear coupled approach, which is illustrated by both numerical simulations and electronic circuit experiments.展开更多
This paper presents an experimental investigation of the influence of a transversal flow deflector on the cooling of a heated block mounted on a flat plate.The deflector is inclined and therefore it guides the air flo...This paper presents an experimental investigation of the influence of a transversal flow deflector on the cooling of a heated block mounted on a flat plate.The deflector is inclined and therefore it guides the air flow to the upper surface of the block.This configuration is simulating the air-cooling of a rectangular integrated circuit or a current converter mounted on an electronic card.The electronic component is assumed dissipating low heat power,as such,air forced convection is still a sufficient cooling way even without fan or heat sink on the component.The measurements are given by hot and cold wires anemometers and by an InfraRed camera.The results give details of the effects of the deflection on the hydrodynamic and the thermal fields on and over the block for different inclination angles.They show that the deviation caused by the deflector may significantly enhance the heat transfer from the component.Deflection is also able to avoid local overheating of the electronic component.Optimum heat transfer rate and homogenised temperature are shown to be obtained with an inclination angle =30°.展开更多
基金upported by National Natural Science Foundation of China(Grant No.60672085)“Taishan Scholarship”Construction Engineering
文摘This paper investigates the synchronization and circuit implementation of a new hyperchaotic Lorenz system. This system is generated by controlling a generalized Lorenz system to hyperchaotic by introducing a linear state feedback controller to its scored equation. Global synchronization of the new hyperchaotic systems can be achieved by unidirectonally linear coupled approach, which is illustrated by both numerical simulations and electronic circuit experiments.
基金support of the Comité Mixte Franco-Tunisien pour la Coopération Universitaire(ProjectCMCU 08G1131)
文摘This paper presents an experimental investigation of the influence of a transversal flow deflector on the cooling of a heated block mounted on a flat plate.The deflector is inclined and therefore it guides the air flow to the upper surface of the block.This configuration is simulating the air-cooling of a rectangular integrated circuit or a current converter mounted on an electronic card.The electronic component is assumed dissipating low heat power,as such,air forced convection is still a sufficient cooling way even without fan or heat sink on the component.The measurements are given by hot and cold wires anemometers and by an InfraRed camera.The results give details of the effects of the deflection on the hydrodynamic and the thermal fields on and over the block for different inclination angles.They show that the deviation caused by the deflector may significantly enhance the heat transfer from the component.Deflection is also able to avoid local overheating of the electronic component.Optimum heat transfer rate and homogenised temperature are shown to be obtained with an inclination angle =30°.
