Numerical studies on pair production in ultra-intense laser interaction with a thin solid-foil

A theoretical and numerical model of photon and electron–positron pair production in strong-field quantum electrodynamics(QED) is described. Two processes are contained in our QED theoretical model, one is photon emission in the interaction of ultra-intense laser with relativistic electron(or positron), and the other is pair production by a gamma-ray photon interacting with the laser field.This model has been included in a PIC/MCC simulation code named BUMBLEBEE 1 D, which is used to simulate the laser plasma interaction. Using this code, the evolutions of electron–positron pair and gamma-ray photon production in ultra-intense laser interaction with aluminum foil target are simulated and analyzed. The simulation results revealed that more positrons are moved in the opposite direction to the incident direction of the laser under the charge separation field.     

环境预警指标体系研究

根据科学的设计思路与设计原则,考虑到环境现象的性质与特点,构建了环境预警指标体系;探讨了环境预警指标体系的应用,设计了环境预警指数模型、环境预警区间及环境预警灯号显示系统,从理论上和实践上论证了环境预警指标体系的科学性与可操作性.     

环境预警指标体系研究

根据科学的设计思路与设计原则，考虑到环境现象的性质与特点，构建了环境预警指标体系；探讨了环境预警指标体系的应用，设计了环境预警指数模型，环境预警区间及环境预警灯号显示系统，从理论上和实践上论证了环境预警指标体系的科学性与可操作性。