Impacts of air pressure on the evolution of nanosecond pulse discharge products

Based on the nonequilibrium plasma dynamics of air discharge, a dynamic model of zero-dimensional plasma is established by combining the component density equation, the Boltzmann equation, and the energy transfer equation. The evolution properties of nanosecond pulse discharge (NPD) plasma under different air pressures are calculated. The results show that the air pressure has significant impacts on the NPD products and the peak values of particle number density for particles such as O atoms, O3 molecules, N2(A3) molecules in excited states, and NO molecules. It increases at first and then decreases with the increase of air pressure. On the other hand, the peak values of particle number density for N2(B3) and N2(C3) molecules in excited states are only slightly affected by the air pressure.     

集成DEMATEL/ISM的复杂系统安全事故致因因素分析

致因因素间复杂的非线性交互作用是造成复杂系统安全事故成因复杂性的主要原因.在提取出复杂系统安全事故的致因因素后,给出了集成DEMATEL/ISM方法分析事故致因因素的算法步骤.基于航空复杂系统实例,采用集成DEMA-TEL/ISM方法求得了致因因素间的综合影响关系、关键致因因素及致因因素多级递阶结构模型,通过复杂网络理论分析节点度,度数大的节点与关键致因因素吻合.所提方法可以用于提取事故关键致因因素和分析因素间的层次关系.     

一维无限深势阱定态波函数动量展开讨论

一维无限深势阱定态的动量概率分布存在两种"互相矛盾"的结论.为帮助学生理解两种结论的异同,锻炼严谨的科学作风和解决复杂问题的能力,笔者在量子力学理论教学中指导学生利用Python等现代科学计算工具,将一维无限深势阱定态波函数动量展开的讨论进行数值求解与可视化,绘制了不同观点以及不同情形下粒子的动量概率分布图.以此为基础讨论了不同计算结果的物理含义,揭示了两种结论的内在联系.此创新性的举措不仅有效加深了学生对于该重要问题的理解,还促进了学生专业知识、科学能力和综合素质的全面培养.