A nonuniform and nonadiabatic model has been developed to research the gas dynamics within a bubble of sonoluminescence.The model includes three diffusive effects of gas viscosity,thermal conduction and radiative tran...A nonuniform and nonadiabatic model has been developed to research the gas dynamics within a bubble of sonoluminescence.The model includes three diffusive effects of gas viscosity,thermal conduction and radiative transport simultaneously,and calculations prove that they have important influences on the characteristics of sonoluminescence.The model has been solved numerically and gives the results of about 104 K peak temperature and l00ps pulse duration which are consistent with recent experiments.展开更多
Single bubble sonoluminescence(SBSL)flashes have been steadily upscaled by a sinusoidal wave with a pulse at each cycle at some suitable phase positions,which proves the prediction of the spiking SBSL suggested by Mos...Single bubble sonoluminescence(SBSL)flashes have been steadily upscaled by a sinusoidal wave with a pulse at each cycle at some suitable phase positions,which proves the prediction of the spiking SBSL suggested by Moss et al.[Phys.Lett.A 211(1996)69].Based on the Rayleigh-Plesset bubble dynamics,the numerical simulation shows a well qualitative agreement with those measured in experiment.展开更多
The parametrically excited solitons manifest themselves with many distinct particle-like behaviors.Here the internal dynamics of the soliton-soliton interactions is explored both analytically and numerically.The resul...The parametrically excited solitons manifest themselves with many distinct particle-like behaviors.Here the internal dynamics of the soliton-soliton interactions is explored both analytically and numerically.The results confirm the attraction between polarity-like solitons and the repulsion between opposite polarity ones.The attraction can make a pair of like polarity solitons form a standing(or oscillating)bound state.Therefore,multisolitons in an unbounded waveguide would asymptotically develop into an array of mutually independent standing soliton(s)or/and the bound state(s).It is shown that the bound state has two unidirectional momenta flowing toward the symmetric center,and thus the solitons do not perform the collisions in the classical sense.It is further demonstrated that the observed periodic“collisions”are actually due to the dissipative-induced collapses and the parametric recreations of solitons.展开更多
The bubble dynamics for the single bubble sonoluminescence(SBSL)has been coupled with the dynamic Casimir effect due to the quantum vacuum fluctuation.The numerical results show that the power radiated by the Casimir ...The bubble dynamics for the single bubble sonoluminescence(SBSL)has been coupled with the dynamic Casimir effect due to the quantum vacuum fluctuation.The numerical results show that the power radiated by the Casimir effect is on the order of 10-38 Wand too weak to fit the experimented observation of SBSL although the spectrum of the radiation can be fitted well.It is impossible to take the quantum Casimir effect as a candidate for the origin of SBSL.展开更多
A method which directs trajectories to the predetermined continuous target orbits in the system described by nonlinear differential equations with perturbation of available system parameters and the conditions for ach...A method which directs trajectories to the predetermined continuous target orbits in the system described by nonlinear differential equations with perturbation of available system parameters and the conditions for achieving targeting is given.The target orbits may be the unstable solution or even may not be the solution of the system.Numerical experiments are given in the periodically forced Brusselator.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19674025.
文摘A nonuniform and nonadiabatic model has been developed to research the gas dynamics within a bubble of sonoluminescence.The model includes three diffusive effects of gas viscosity,thermal conduction and radiative transport simultaneously,and calculations prove that they have important influences on the characteristics of sonoluminescence.The model has been solved numerically and gives the results of about 104 K peak temperature and l00ps pulse duration which are consistent with recent experiments.
基金Supported in part by the Special Funds for Major State Basic Research Projectsthe Natural Science Foundation of Jiangsu Provincethe Foundation for University Key Teacher by the Ministry of Education.
文摘Single bubble sonoluminescence(SBSL)flashes have been steadily upscaled by a sinusoidal wave with a pulse at each cycle at some suitable phase positions,which proves the prediction of the spiking SBSL suggested by Moss et al.[Phys.Lett.A 211(1996)69].Based on the Rayleigh-Plesset bubble dynamics,the numerical simulation shows a well qualitative agreement with those measured in experiment.
基金Supported by the National Natural Science Foundation of China under Grant No.19774029.
文摘The parametrically excited solitons manifest themselves with many distinct particle-like behaviors.Here the internal dynamics of the soliton-soliton interactions is explored both analytically and numerically.The results confirm the attraction between polarity-like solitons and the repulsion between opposite polarity ones.The attraction can make a pair of like polarity solitons form a standing(or oscillating)bound state.Therefore,multisolitons in an unbounded waveguide would asymptotically develop into an array of mutually independent standing soliton(s)or/and the bound state(s).It is shown that the bound state has two unidirectional momenta flowing toward the symmetric center,and thus the solitons do not perform the collisions in the classical sense.It is further demonstrated that the observed periodic“collisions”are actually due to the dissipative-induced collapses and the parametric recreations of solitons.
文摘The bubble dynamics for the single bubble sonoluminescence(SBSL)has been coupled with the dynamic Casimir effect due to the quantum vacuum fluctuation.The numerical results show that the power radiated by the Casimir effect is on the order of 10-38 Wand too weak to fit the experimented observation of SBSL although the spectrum of the radiation can be fitted well.It is impossible to take the quantum Casimir effect as a candidate for the origin of SBSL.
基金Supported by the National Natural Science Foundation of China.
文摘A method which directs trajectories to the predetermined continuous target orbits in the system described by nonlinear differential equations with perturbation of available system parameters and the conditions for achieving targeting is given.The target orbits may be the unstable solution or even may not be the solution of the system.Numerical experiments are given in the periodically forced Brusselator.
