圆柱形紧凑环的倾倒型不稳定性

“紧凑环”是内部有环向场和极向场,而外部只有极向场的能量极小化的等离子体位形。本文分析了圆柱形“紧凑环”的无力平衡和稳定性,发现当等离子体柱长度与半径的比值L/R大于1.67时,轴对称的平衡态就会不稳定而发生倾倒。     

气相色谱法分离正己烷和环己烷的实验设计与教学探索

The experiment of separating low toxic n-hexane and cyclohexane by traditional gas chromatography was improved with orthogonal experimental design. The effect of sample quantity, vaporization chamber temperature, detector temperature, column temperature, line velocity and separability of the split ratio were examined. Through the experiment, students could understand the use and maintenance of gas chromatography instruments. At the same time, they could understand separability and column efficiency of chromatography.     

基于系统动力学的供应链库存策略仿真研究

针对一个动态、多级的供应链库存系统,应用系统动力学的方法,建立了供应链(s,S)库存策略下的物流成本模型,并通过动态仿真,分析了库存策略的变动对于供应链库存系统各级成员间库存供需的动态行为,提出了(s,S)策略下的供应链库存系统的有效管理方法.     

氮掺杂硅酸亚铁锂正极材料的制备及电化学性能

采用溶胶-凝胶法制备了氮掺杂的硅酸亚铁锂正极材料.通过X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、充放电测试和交流阻抗测试（EIS）等对材料的结构及电化学性能进行了表征.结果表明,N元素已掺杂到Li₂FeSiO₄材料晶格中,样品具有较小的颗粒尺寸和优异的动力学性能,表现出较好的充放电比容量和倍率特性,首次放电比容量为130 mA·h/g,循环50次后比容量仍可达到124 mA·h/g,容量保持率高达95%.     

Synchronization investigation of the network group constituted by the nearest neighbor networks under inner and outer synchronous couplings

A new synchronization technique of inner and outer couplings is proposed in this work to investigate the synchronization of network group. Some Haken–Lorenz lasers with chaos behaviors are taken as the nodes to construct a few nearest neighbor complex networks and those sub-networks are also connected to form a network group. The effective node controllers are designed based on Lyapunov function and the complete synchronization among the sub-networks is realized perfectly under inner and outer couplings. The work is of potential applications in the cooperation output of lasers and the communication network.     

自由边界等离子体平衡问题的数值解法

一、基本方程和边界条件 在轴对称情况下,采用柱坐标系(R,z,),可将磁流体平衡方程用流函数ψ表示为