非均匀介质中电磁场定解方程的确立

针对非均匀介质中的电磁场,结合一阶偏微分场方程和介质的物态关系,从稳恒场到时变场,研究定解方程的建立过程,集中给出不同场合下定解问题中变系数非齐次偏微分方程的各个具体形式,为求解相应电磁场问题提供理论基础.     

Control of microwave signals using bichromatic electromechanically induced transparency in multimode circuit electromechanical systems

We theoretically investigate the tunable delay and advancement of microwave signals based on bichromatic electromechanically induced transparency in a three-mode circuit electromechanical system, where two nanomechanical resonators with closely spaced frequencies are independently coupled to a common microwave cavity. In the presence of a strong microwave pump field, we obtain two transparency windows accompanied by steep phase dispersion in the transmitted microwave probe field. The width of the transparency window and the group delay of the probe field can be controlled effectively by the power of the pump field. It is shown that the maximum group delay of 0.12 ms and the advancement of0.27 ms can be obtained in the current experiments.     

Generation and application of high-contrast laser pulses using plasma mirror in the SULF-1PW beamline

The plasma mirror system was installed on the 1 PW laser beamline of Shanghai Superintense Ultrafast Laser Facility [SULF)for enhancing the temporal contrast of the laser pulse. About 2 orders of magnitude improvement on pulse contrast was measured on picosecond and nanosecond time scales. The experiments show that high-contrast laser pulses can significantly improve the cutoff energy and quantity of proton beams. Then different target distributions are assumed in particles in cell simulations, ...     

介质中的电磁动量与应力张量

围绕电动力学相关内容,针对介质中电磁动量及应力张量问题,依据麦克斯韦方程组、洛仑兹力及动量守恒定律等,并着力结合近年的理论研究进展,比较与分析介质中电磁动量、应力张量不同形式的区别与联系,探究其物理内涵与作用,力图为相关的教学与研究工作提供参考.     

六、排列组合、二项式定理

知识要点］一、掌握加法原理和乘法原理．会用这两个原理解决实际问题．二、理解排列与组合的概念．排列是与“顺序”有关的,而组合是与“顺序”无关的．三、解排列与组合问题,一般基本思路有直接解答（即直接法）与间接解答（即间接法）．在复习中注意体会,对于一个具...