Linear hybrid simulations of low-frequency fishbone instability driven by energetic passing particles in tokamak plasmas

A linear simulation study of energetic passing particle-driven low-frequency fishbone instability in tokamak plasmas has been carried out using the global kinetic-MHD (magnetohydrodynamics) hybrid code M3D-K. This work is focused on the interaction of energetic passing beam ions andn=1 mode with a monotonic safety factorqprofile andSpecifically, the stability and mode frequency as well as mode structure of then=1 mode are calculated for scans of parameter values of beam ion beta, beam ion injection energy, beam ion orbit width, beam ion beta profile, as well as background plasma beta. The excited modes are identified as a low-frequency fishbone with the corresponding resonance ofwhereis the beam ion toroidal transit frequency andis the beam ion poloidal transit frequency. The simulated mode frequency is approximately proportional to the beam ion injection energy and beam ion orbit width. The mode structure is similar to that of internal kink mode. These simulation results are similar to the analytic theory of Yuet al.     

复杂功能超高层建筑的结构设计挑战

0引言总部位于美国纽约的宋腾添玛沙帝工程顾问有限公司(Thornton Tomasetti Inc.,简称TT),是一个专长大型复杂结构设计的公司,其凭借专业实力,参与了世界前20个超高层建筑中近一半项目的结构设计,包括已建成的中国台湾台北市的世界金融中心(即台北101)、马来西亚吉隆坡的双子石油大厦、上海的恒隆广场和正在建设中的上海中心、芝加哥螺旋塔、     

浅谈热再生工艺在公路养护中的应用

随着交通量和车辆轴重的增加,使用年限的增长以及天气等大自然的原因：沥青路面的变质和老化越来越严重,需要增加维护的投入以保持其应有的通行能力。旧沥青混合料的再生利用有利于处治废料、节约能源、保护环境。由于旧沥青混合料得以利用,具有显著的经济效益和社会、环境效益。在本．文中,笔者结合自己多年来的工作实践经验,对热再生工艺在公路养护中的应用进行了详细论述。     

浅析国产脱硫剂在LO-CAT硫磺回收装置上的工业应用

介绍了陕西延长石油炼化公司与天然气研究院共同开发的LO-CAT硫磺回收装置脱硫剂,在延安石油化工厂工业应用过程中出现的问题,并对试验出现的问题做出分析研究,给出相应地解决方法或建议。工业应用结果表明,国产脱硫剂满足LO-CAT硫磺回收装置的生产需求,所产粗硫磺颜色、含水量等基本正常,尾气中H2S含量10 mg/m3达到环保要求。