Electron acceleration by tightly focused radially polarized few-cycle laser pulses

Within the framework of plane-wave angular spectrum analysis of the electromagnetic field structure, a solution valid for tightly focused radially polarized few-cycle laser pulses propagating in vacuum is presented. The resulting field distribution is significantly different from that based on the paraxial approximation for pulses with either small or large beam diameters. We compare the electron accelerations obtained with the two solutions and find that the energy gain obtained with our new solution is usually much larger than that with the paraxial approximation solution.

泰州市市区发展策略研究

通过SPSS软件采用因子分析法对江苏省13个城市及金华、淮南、莱芜、佛山、来宾等5个地级市市区2014年的16项指标进行了比较排名。结果表明,泰州市市区的发展程度相比大部分其他地级市较高,而在江苏省内各城市市区中则处于靠后位置,集中体现为经济体量不大,人口吸引力不强,产业结构不优,居民消费能力偏弱。最后对泰州市市区未来发展提出了具体策略建议。

运动流体界面Rayleigh-Taylor不稳定性研究

本文从非相对论流体和相对论流体的基本方程组出发,讨论了重力场下处于匀速运动的两种理想流体界面在随动参考系与实验室参考系下Rayleigh-Taylor(RT)线性不稳定性的增长率.计算表明,非相对论流体RT不稳定增长率与参考系的选择无关.相对论流体温度和压强对RT不稳定有抑制作用,且相对论流体的速度也使该不稳定增长率下降.

需求侧管理的“趋同”与供给侧管理的“求异”

需求侧管理的"趋同"导致经济结构的简单化、低端化和经济政策的单一化、短期化,诱发产能过剩、效率损失和经济转型迟滞。供给侧管理的"求异"有助于加快经济动能的更迭,增强经济的抗风险能力。综合平衡"趋同"和"求异",使经济持续健康发展。