A comprehensive study on the mechanical behavior of foamed metals was demonstrated.The relationship among their mechanical properties,preparation method,porosity and the structure was briefly studied as well.
The influences of laser pulses with negative frequency chirp and different pulse cycles on pair production are studied.By solving the quantum Vlasov equation,the momentum distribution and the number density of the cre...The influences of laser pulses with negative frequency chirp and different pulse cycles on pair production are studied.By solving the quantum Vlasov equation,the momentum distribution and the number density of the created pairs are obtained numerically.It is found that the chirp rate can enhance the pair production rate in both supercycle and subcycle pulses.Moreover,there is an optimal cycle parameter corresponding to the maximum number density under the same chirp rate.The pair number density is sensitive to the cycle parameter when it is less than the optimal one.Compared to the positive frequency chirp,in the case of the negative frequency chirp,the optimal cycle parameter is increased.展开更多
Effects of frequency variation on vacuum electron-positron pair production in strong pulsed laser fields are investigated in the framework of a quantum kinetic method.It is found that the slowly varying frequency can ...Effects of frequency variation on vacuum electron-positron pair production in strong pulsed laser fields are investigated in the framework of a quantum kinetic method.It is found that the slowly varying frequency can influence the pair production to some extent,while rapid varying frequency can increase the pair creation rate a few orders if the time lies within a narrow time window,in which frequency jump occurs.The possible physical mechanism behind the pair enhancement phenomenon is discussed briefly.展开更多
The spatiotemporal chaos in the system described by a one-dimensional nonlinear-drift wave equation is suppressed by non-feedback pinning method.By adding additive external noise to the controlled state,we find that t...The spatiotemporal chaos in the system described by a one-dimensional nonlinear-drift wave equation is suppressed by non-feedback pinning method.By adding additive external noise to the controlled state,we find that the deviation from the target space-time pattern increases in a power law with noise intensity.The possible controlling mechanism is discussed.展开更多
基金Item Sponsored by National Natural Science Foundation of China(50201003)
文摘A comprehensive study on the mechanical behavior of foamed metals was demonstrated.The relationship among their mechanical properties,preparation method,porosity and the structure was briefly studied as well.
基金Supported by the National Natural Science Foundation of China under the grant Nos 11175023,11305010 and 11335013partially by the Open Fund of National Laboratory of Science and Technology on Computational Physics(IAPCM).
文摘The influences of laser pulses with negative frequency chirp and different pulse cycles on pair production are studied.By solving the quantum Vlasov equation,the momentum distribution and the number density of the created pairs are obtained numerically.It is found that the chirp rate can enhance the pair production rate in both supercycle and subcycle pulses.Moreover,there is an optimal cycle parameter corresponding to the maximum number density under the same chirp rate.The pair number density is sensitive to the cycle parameter when it is less than the optimal one.Compared to the positive frequency chirp,in the case of the negative frequency chirp,the optimal cycle parameter is increased.
基金Supported by the National Natural Science Foundation of China under Grant No 11175023the Research Funds of National Laboratory of Science and Technology on Computational Physics at Institute of Applied Physics and Computational Mathematics.
文摘Effects of frequency variation on vacuum electron-positron pair production in strong pulsed laser fields are investigated in the framework of a quantum kinetic method.It is found that the slowly varying frequency can influence the pair production to some extent,while rapid varying frequency can increase the pair creation rate a few orders if the time lies within a narrow time window,in which frequency jump occurs.The possible physical mechanism behind the pair enhancement phenomenon is discussed briefly.
基金Supported by the Visiting Scholar Foundation of Kay Laboratory of Education Ministry under Grant No.211220001the National Natural Science Foundation of China under Grant Nos.19675006 and 19835020the Special Funds for Major State Basic Research Projects.
文摘The spatiotemporal chaos in the system described by a one-dimensional nonlinear-drift wave equation is suppressed by non-feedback pinning method.By adding additive external noise to the controlled state,we find that the deviation from the target space-time pattern increases in a power law with noise intensity.The possible controlling mechanism is discussed.
