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38 个结果
  • 简介:AnargonatmosphericpressureplasmajetwasemployedtotreatL929murinefibroblastsculturedinvitro.Experimentalresultsshowedthat,comparedwiththecontrolcells,thetreatmentoffibroblastswith15sofplasmaledtoasignificantincreaseofcellviabilityandcollagensynthesis,whilethetreatmentof25splasmaresultedinaremarkabledecrease.Explorationofrelatedmechanismssuggestedthatcoldplasmacouldup-regulateCyclinD1geneexpressionanddown-regulatep27geneexpressionatalowdose,whileitcoulddown-regulateCyclinD1expressionandup-regulatep27expressionatahigherdose,thusalteringthecellcycleprogression,andthenaffectingcellviabilityandcollagensynthesisoffibroblasts.

  • 标签: 成纤维细胞 冷等离子体 细胞活力 胶原合成 小鼠 P27基因
  • 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: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:Zn_(1-x)Cu_xOthinfilmsweresynthesizedbytheradiofrequency(RF)magnetronsputteringtechniqueusingaZnOtargetcontainingdifferentpiecesofsmallCu-chips.X-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)wereemployedtoanalyzethecrystallineandmicrostructureofthefihn,andX-rayphotoelectronspectroscopy(XPS)wasusedtoestablishthebondingcharacteristicsandoxidationstatesofcopperinsidetheZnOhost.Roomtemperature(RT)ferromagnetismwasobservedintheZn_(1-x)Cu_xOfilmsbyaQuantumDesignsuperconductingquantmninterferencedevice(SQUID)andthesaturationmagneticmomentofthefilmswasfoundtodecreasewiththeincreaseinCucontent.

  • 标签: 射频磁控溅射 薄膜合成 显微结构 铁磁性 组分 超导量子干涉器件
  • 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:本文扼要介绍了光束线真空控制保护系统的设计思想、设计要求、系统的作用和某些改进。此外,系统在设计了上采用了新技术-可编程序控制器(PLC),使控制系统的可靠性和灵活性得到了进一步的提高。研制这个系统的主要目的是,当光束线上出现(由铍窗或波纹管等偶然破裂引起的)灾难性真空事故时,能够有效地保护北京正负电子对撞机中的大型超高真空装置-电子储存环的真空系统不会遭到这种灾难的破坏,使其安全运行。本光束线的真空控制保护系统于1996年投入试运行,于1998年年底通过院级鉴定和验收。

  • 标签: BSRF 3W1光束线 真空控制保护系统 储存环
  • 简介:Anewrectangularpulsetriggergeneratorhasbeendevelopedwhichcangeneratetwo10kVpulseswitharisetimelessthan1ns,ajitterof0.2nsandawidthofabout10nsand40ns,respectively.Thisgeneratorusestwopolymer-foilswitchesand25ohmBlumleintransmissionlinescomposedoftwo-parallelstandardcoaxialcablesdischargingintotwo50ohmoutputcables.Thepulsewidthandthedelaybetweentwopulsescanbeadjustedbychangingthelengthofthecables.

  • 标签: 矩形脉冲发生器 触发脉冲发生器 延迟 振动
  • 简介:对于x从0.0到0.4之间变化的Pt1-xSrxMnO3多晶体所进行的价带光电子能谱实验显示,在Fermi边和Fermi边以下-12eV范围内出现的能带态密度随掺杂量x有一个显著的变化。对这些现象以Pr1-xSrxMnO3体系在基态下发生电荷转移为出发点进行了讨论。提出了随掺杂量x的非线性电荷转移机制和存在由电荷转移导致的二级相变的可能性。

  • 标签: Pr1-xSrxMnO3 价带 光电子能谱 稀土锰酸盐 能带态密度 非线性电荷转移机制