FDTD Simulation on Power Absorption of Terahertz Electromagnetic Waves in Dense Plasma

A finite difference time domain (FDTD) method is used to numerically study the power absorption of broadband terahertz (0.1 ～ 1.5 THz) electromagnetic waves in a partially ionized uniform plasma layer under low pressure and atmosphere discharge conditions. The power absorption spectra are calculated numerically and the numerical results are in accordance with the analytic results. Meanwhile, the effects on the power absorption are calculated with different applied magnetic fields, collision frequencies and electron number densities, which depend strongly on those parameters. Under the dense strongly magnetized plasma conditions, the absorption gaps appear in the range of 0.3 ～ 0.36 THz, and are enlarged with the increasing electron number density.     

MATLAB在遗传模糊控制系统仿真中的应用

采用MATLAB编程的方式实现了遗传算法优化模糊控制器,叙述了遗传算法优化隶属函数的具体方法.通过实例验证,该方法有效地解决了模糊控制系统的优化设计和仿真问题,并且使控制系统的控制效果得到了改善.     

高速／超高速砂轮基盘的优化分析

为了确保高速/超高速砂轮的安全性,对砂轮的受力进行了系统分析.认为砂轮工作时,砂轮的安全性主要受离心力的影响,整体式高速砂轮应以校核砂轮的抗拉强度为主,而超高速分体式砂轮应以控制基盘的径向膨胀量为主.并以ANSYS软件为辅助工具,分别对砂轮基盘的形状、材料、孔径比进行了分析和选择.最后,以最小径向膨胀量为目标函数,在200m/s的转速下,对钛合金梯形基盘的截形进行了最优化.     

椅子中的龙纹装饰

本文对中国传统家具中的椅子龙纹装饰的演变进行了索源分析,指出龙纹国粹应为现代家具设计提供新的启迪。     

论建筑造型的客观设计

本文通过一些建筑实例的分析,从建筑的涵义、物质条件的制约、设计的整体构思、从设计到建成的整个过程等方面论述了建筑设计的客观性。     

关于大学生校外住宿的调查与探讨

大学为学生们提供的住宿条件,以及制定的宿舍管理制度与许多学生的住宿要求之间存在着差距,这个差距就造成了,有一定数量的大学生在校外租房,是一种正常的现象,既有其好处,也有其坏处,在适当的范围内允许学生自由选择其住宿方式不会造成学校总体教学质量的下降,是一种可行的管理制度改革思路.     

山西电力网真会议系统的应用分析

网真系统是一种通过结合超高清晰度视频、音频和交互式组件,在IP网络上创建一种独特的＂面对面＂体验的新型技术。它的主要目标是缩短人与人之间、人与地点之间的距离,从时间和空间感上都超越了传统会议。对该系统在山西电力的应用情况进行了分析。     

Effect of Equilibrium Current Profiles on External Kink Modes in Tokamaks

Based on a linearized MHD model, the effect of equilibrium current profiles on external kink modes in tokamaks is studied by MARS code. Three types of equilibrium current profiles are adopted in this work. Firstly, a set of parabolic equilibrium current profiles are chosen. In these profiles the maximum current values in the center of the plasma are fixed, and the currents have different gradient and jump at the plasma boundary. The effects of the current gradient and jump on the growth rate of external kink mode are investigated. It is found that the current jump which causes the q profiles to change plays an important role in the externM kink modes in tokamaks. Secondly, a set of step equilibrium current profiles with different jump positions are chosen. The effect of jump position on external kink modes is discussed. Thirdly, a set of parabolic equilibrium current profiles with current bumps are chosen for the case of off-axis heating. The effects of height~ width and position of the current bumps on external kink modes are analyzed. The fiat equilibrium current profiles are disadvantageous for the MHD stabilities of tokamaks, because of the large current jump at the plasma edge. The peaked equilibrium current profiles and a large and localized current bump near the plasma edge benefit the MHD stabilities of tokamaks.     

降低工业尾气中甲苯含量的几种常用方法

概述常用的降低工业尾气中甲苯含量的方法,介绍利用活性碳吸附及催化氧化方法处理甲苯浓度波动大的业尾气。     

7SJ512数字式过流保护在无人值守站中的应用

介绍了西门子7SJ512保护装置的功能特性,并以其在无人值守站中的应用实例来说明.