简介:InthedischargeofEASTtokamak,itisobservedthat(2,1)neoclassicaltearingmode(NTM)istriggeredbymodecouplingwitha(1,1)internalmode.Usingsingularvaluedecomposition(SVD)methodforsoftX-rayemissionandforelectroncyclotronemission(ECE),thecouplingspatialstructuresandcouplingprocessbetweenthesetwomodesareanalyzedindetail.TheresultsofSVDforECErevealthatthephasedifferencebetweenthesetwomodesequalstozero.Thisisconsistentwiththeperfectcouplingcondition.Finally,performingstatisticalanalysisofγ1/1,ζ1/1andω2/1,wefindthatγ1/1moreaccuratelyrepresentsthecouplingstrengththanζ1/1,andγ1/1isalsostronglyrelatedtothe(2,1)NTMtriggering,whereγ1/1isthewidthof(1,1)internalmode,ζ1/1istheperturbedamplitudeof(1,1)internalmode,andω2/1denotesthemagneticislandwidthof(2,1)NTM.
简介:建设21世纪海上丝绸之路面临诸多风险和挑战:美国、日本、印度等大国的战略竞争;与周边部分邻国海洋争端的困扰;沿线国家政局变幻及经济结构脆弱可能引发投资风险;地区冲突外溢与非传统安全挑战。这些风险与挑战虽无法回避并可能使中国与沿线国家的政策对接存在困难,但尚不足以使海上丝绸之路建设寸步难行。中国应冷静看待海上丝绸之路建设面临的风险与挑战,统筹考虑"一带一路"实施进程,妥善处理安全议题,建立综合性风险预防机制,真正落实共商、共建、共享原则。