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61 个结果
  • 简介:StableoperatingregionintheHL-1Mtokamakhasbeenextendedbymeansofwallconditioning,corefuellingandcurrentcontroltechniques.Themechanismsoftheextensionareanalyzedinthispaper.Lithiumizationdiminishestheimpuritiesandhydrogenrecyclingtothelowestlevel.Afterlithiumizationahighdensityupto7×1019m-3wasobtainedeasilybystronggaspuffingwithordinaryohmicdischargealone.MoreattractivelywefoundthatmetalLi-coatingexhibitedtheeffectsofwallstabilization.Thelowqalimitwithhigherdensitywasextendedbyafactorof1.5~2incomparisonwiththatforboronization,and1.2forsiliconization.Siliconizationnotonlyextendedstableoperatingregionsignificantlybyitself,butalsoprovidedagoodtargetplasmaforotherexperimentsofraisingdensitylimit.Corefuellingschemesarefavourableespeciallyforsiliconizedwallwithahigherlevelofmedium-Zimpurity(Z=14).Aftersiliconizationthemaximumdensitynearto1020m-3wasachievedbyacombinationofsupersonicmoleculebeaminjectionandmultipelletinjection.ThenewdefinedslopeofHugilllimitillustratingmoreclearlythesituationunderlowqaandhighnedischargeswascreatedtoindicatethenewregionextendedbycombiningIpramp-upwithcorefuelling.TheslopewithalargeMurakamicoefficientincreasedbyafactorof50~60%.

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  • 简介:Vacuumtreatmentandion-beambombardmentaretwomajorprocessesinthelowenergyion-beamimplantation.Toaccuratelystudythecontributionsofthesetwomajorfactorstothebioeffectsseparately,theM_1generationvariationofArabidopsisthalianawithion-beamimplantationandvacuumtreatmentwerecomparedthroughaseriesofkeyplantdevelopmentparametersincludingmorphologicalobservation,biochemicalassayandRAPD(randomamplifiedpolymorphicDNA)analysis.Theresultsshowedthation-beamimplantationhadobviouseffectonalmostalloftheseparameters,andthevacuumtreatmenthadsomeimpactsonseveralmorphologicalparameterssuchastheboltingtimeandthelengthoftheprimarystem.Takingtheresultstogether,theindicationisthatvacuumtreatmenthassomeslightcontributionstothebioeffectsofion-beamimplantationwhileion-beambombardmentitselfisthemajorcreatorofthebioeffects.

  • 标签: 离子束 真空 主要因子 等离子物理 DNA 参量
  • 简介:该出版物属于评估与管理核电厂主要构件老化的系列报告之一,目前对安全余量评估和检查、监控与减缓核电厂混凝土结构与老化相关的退化的现行方法在本刊物中有记录。新堆型设计的含义和与旧版的差异在本刊中也得以讨论。这一信息的要点在于直接或间接地帮助相关方确保核电厂安全运行。

  • 标签: 混凝土结构 老化管理 核电厂 IAEA No 丛书
  • 简介:InthedischargeofEASTtokamak,itisobservedthat(2,1)neoclassicaltearingmode(NTM)istriggeredbymodecouplingwitha(1,1)internalmode.Usingsingularvaluedecomposition(SVD)methodforsoftX-rayemissionandforelectroncyclotronemission(ECE),thecouplingspatialstructuresandcouplingprocessbetweenthesetwomodesareanalyzedindetail.TheresultsofSVDforECErevealthatthephasedifferencebetweenthesetwomodesequalstozero.Thisisconsistentwiththeperfectcouplingcondition.Finally,performingstatisticalanalysisofγ1/11/1andω2/1,wefindthatγ1/1moreaccuratelyrepresentsthecouplingstrengththanζ1/1,andγ1/1isalsostronglyrelatedtothe(2,1)NTMtriggering,whereγ1/1isthewidthof(1,1)internalmode,ζ1/1istheperturbedamplitudeof(1,1)internalmode,andω2/1denotesthemagneticislandwidthof(2,1)NTM.

  • 标签: 模式耦合 托卡马克 EAST NTM 结构要素 新经典撕裂模
  • 简介:日本福岛核事故已过去一年,核事故造成的影响依然在延续,专家和学者对福岛核事故从管理、技术、文化及应急响应等角度进行了探讨和深入研究,各国监管部门进行核安全综合检查和相关的压力测试,核设施的纵深防御概念在延伸和拓展,从福岛核事故再次审视核安全的政府、法律和监管框架,对于风险社会下核安全水平的提升意义重大而深远。

  • 标签: 核安全 福岛核事故 政府、法律和监管框架
  • 简介:某制造厂在核级阀门返厂维修过程中出现核l级阀门锻件违规补焊事件,之后又在核级阀门制造过程中出现无损检验违规事件,两起事件造成核级阀门出现了质量隐患.该违规事件反映出制造厂质量保证体系运转存在严重问题,工程公司和业主监造不力.事件相关方应加强质量管理和过程控制,消除质量隐患,做好经验反馈,确保核设备质量.

  • 标签: 核级阀门 违规补焊 无损检验违规 质量保证体系 经验反馈
  • 简介:在严重事故下,核电厂状态千变万化,如何缓解事故是对核电厂人员的极大挑战.《AP1000核电厂严重事故管理导则》指导技术支持中心评估事故状态,分析缓解措施的正反两面影响,确定最佳缓解策略,由主控室操纵员进行实施并监视其有效性.本文对《AP1000核电厂严重事故管理导则》的框架结构进行了梳理,以便核电厂工作人员更好地理解和使用这一导则.

  • 标签: AP1000 SAMG 技术支持中心