简介:Theequilibriumfittingcode(EFIT)anditsapplicationintheJ-TEXTtokamakareintegratedbytheMatlablanguage.Thefunctionofanalysisandvisualizationtotheresultsisadded.Inaddition,theexperimentdatameasuredbysoftX-ray(SXR)areusedtocalculateplasmaequilibriumasaconstraintcondition.TheimprovedEFITcodeisusedforJ-TEXTdischargeandtheprofilesofplasmaparameterssuchasfluxfunction,safetyfactorq,pressureandcurrentdensityareobtainedfromthereconstructedconfigurations.
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简介:Wehavedevelopedalargenumberofexocrineglandsonliquoriceleavesandfacilitatedpolysaccharidesecretion.Liquoricepolysaccharidepossessesstrongerboundwateraffinitytogaseouswatercomparedwithsucroseandglucose.Ourresultsshowthattheboundwateraffinityofliquoricepolysaccharidetogaseouswateris49.75%higherthanglucose(p<0.01).WithN~+implantation(totaldosageof4.68×10~(16)ions/cm~2andenergyof20keV)intodryliquoriceseeds,boththeboundwateraffinitytogaseouswaterandtheboundwatercontentofdryliquoriceleafcanbesignificantlyincreased30.24%(p<0.01)and36.51%(p<0.01)respectivelycomparedwiththesham-irradiatedseeds.Meanwhile,withtheseparameterschosenforN~+implantationintodryliquoriceseeds,theleafpolysaccharidecontentunderwaterstress(ψ_w=-1.5MPa)canincreasesignificantly(p<0.05)andtheplantgrowthcanalsoimprovesignificantly(p<0.05).
简介:Thedielectricbarrierdischarge(DBD)intheglowregimeinneonhasbeeninvestigatedbyexperimentandtwo-dimensional(2D)fluidmodeling.ThedischargewascarriedoutinaplanarDBDsystemwithsegmented-electrodesdrivenbysquare-wavevoltage.TheresultsshowthattheglowDBDoriginatesinthecenteroftheelectrodeandexpandsoutwardtotheelectrodeedgeduringeachhalfcycleofthevoltage,formingaradialstructure.Thedischargedecaysfirstlyintheinnerareabutsustainslongerintheedgearea,showingareverseddischargearea.Thedischargecannotcompletelycovertheentireelectrodesurface,butremainsaborderofnon-orweakdischarge.Thefluidmodelingshowsasimilarresultinagreementwiththeexperiments.Thesimulationsindicatethattheelectricfieldintheedgeareaisdistortedduetotheboundaryeffectsothattheelectricfieldandchargedistributionaredifferentfromthatintheinnerpart.Thedistortedfieldreducesthelongitudinalcomponentneartheedgeandcausesthelocalfieldtobelowerthanthatinthecenter,andhencemakesthedischargebehindhand.Italsoinducesatransversefieldthatmakesthedischargeextendradiallyoutwardtotheedge.TheboundaryeffectplaysanimportantroleintheglowDBDstructure.
简介:Alargediamondcrystalupto500μmindiameterwithasmooth(100)facetatitstophasbeensynthesizedonMosubstratethroughmicrowaveplasmachemicalvapordeposition(MPCVD).Itsmorphologyandqualitywerecharacterizedbyscanningelectronmicroscopy(SEM),andthegrowthmechanismwasroughlyillustratedfrombothmacroscopicandmicroscopicviewpoints.Itwasfoundthatmorphologicalinstabilitiesareamajorfactorresultinginsynthesisoflargediamondcrystals,moreover,highmicrowavepowerdensity(MPD),highCH4concentrations,highpressure,highsubstratesurfacetemperatureandtheadditionofasmallamountofO2werealsonecessaryforthesynthesisoflargediamondcrystals.
简介:BipyridylrutheniumdyeN3andN719wassynthesized,purifiedbythegelchromatogrammethodandcharacterizedbytheprotonNMRandUV-Visspectra.Afterthepurificationmostoftheimpuritiesthatdecreasedthephotoelectrochemicalpropertieswereremovedandtheopen-circuitvoltage(V_(oc)),short-circuitphotocurrentdensity(J_(sc))andoverallphoto-electricconversionefficiency(η)ofthedye-sensitizedsolarcells(DSCs)increaseddramatically.Thestandardcurveofabsorbancevs.concentrationofN3andN719dyewasachievedbyusingUV-Visquantitativeanalyticspectrophotometry.ThismethodwasemployedtodeterminetheconcentrationofthedyesolutionaftercoatingofTiO_2films.Thelinearconcentrationrangeofabsorbancevs.concentrationofN719wasbetween6.25×10~(-6)mol·L~(-1)and1×10~(-4)mol·L~(-1)withthemolarextinctioncoefficient(ε)1.58×10~4L·mol~(-1)cm~(-1)atawavelengthof533~531nmand1.50×10~4L·mol~(-1)·cm~(-1)atawavelengthof393~384nm,accordingly.ThelinearconcentrationrangeoftheN3dyewas6.25×10~(-6)mol·L~(-1)to1.5×10~(-4)mol·L~(-1)withεof1.47×10~4L·mol~(-1)·cm~(-1)atawavelengthof538~535nmand1.48×10~4L·mol~(-1)·cm~(-1)atawavelengthof399~393nm.
简介:Thecurrentsheathvelocityin0.25TorrgaspressureofFilippovtypeplasmafocusisstudiedexperimentally.Byusingtwotridimensionalmagneticprobesontopoftheanodesurface,thecurrentsheathvelocityismeasuredforargon,oxygenandnitrogen.Additionally,theeffectofchargingvoltageonthecurrentsheathvelocityisstudiedinbothaxialandradialphases.Wefoundthat,themaximumcurrentsheathvelocitiesatbothradialandaxialphasesarerespectively4.33±0.28(cm/μs)and3.92±0.75(cm/μs)withargonastheworkinggasat17kV.Also,theminimumvaluesofcurrentsheathvelocityare1.48±0.15(cm/μs)attheradialphaseand1.14±0.09(cm/μs)attheaxialphasewithoxygenat12kV.Thecurrentsheathvelocityattheradialphaseishigherthanthatattheaxialphaseforallgasesandvoltages.Inthisstudy,variationofthefullwidthhalfmaximum(FWHM)ofmagneticprobesignalswithvoltageisinvestigatedfordifferentgasesatradialandaxialphases.
简介:Neutralbeaminjection(NBI)isrecognizedasoneofthemosteffectivemeansforplasmaheating.A100slongpulseneutralbeamwith30keVbeamenergy,10Abeamcurrentanda100slongpulsemodulatingneutralbeamwith50keVbeamenergy,16AbeamcurrentwereachievedintheEASTneutralbeaminjectoronthetest-stand.ThepreliminaryresultssuggestthatEAST-NBIsysteminitiallypossesstheabilityoflongpulsebeamextraction.
简介:IntheframeworkoftheITER,qualificationtests,thefirstChinaTFconductorsample(CNTFl)wastestedattheSULTANfacility.ThesamplewasmadeoftwoTFconductorsectionsmanufacturedfromidenticalinternalstannumstrandsprovidedbytheOxfordSuperconductingtechnologycompany(OST).Inordertoevaluatetheconductorperformance,thecurrentsharingtemperature(Tcs)wasmeasuredatspecifiedelectromagneticloadcyclingsteps.BothconductorsectionsoftheCNTFlsampleshowedidenticalperformance.Tcswas7.2Kbeforecyclingloading,and6.9Kevenafter950cycles,withoutsignificantdegradation,whichsubstantiallyexceedstheITERrequirementof5.7K.ThetestsoftheCNTFlconductorsampleshowedthattheelectromagneticcyclicloadexhibitedanegligibleeffectontheconductorperformance.Thecouplingtimeconstant8forAClosswas214msand71.52msbeforeandafterthecyclingload,respectively.Thetestresultsofthesamplearecomparedwiththestrandperformanceandparametermodelanalysis.
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简介:EXAFS研究FeCl3溶液中Fe^3+的区域环境结构随溶液浓度的变化,Fe^3+的径向结构函数表明,随着FeCl3溶液的浓度降低,第一配位峰的距离逐渐缩短。当溶液浓度从3.0mol/L降到0.2mol/L时,配位距离减小0.014nm,但振幅峰强度以0.8mol/L浓度为最小,其强度比浓的或稀的FeCl3浓度的低约30%。结构参数拟合结果表明,0.2mol/LFeCl3稀溶液中Fe^3+的近邻配位为6个H2O的O原子形成八面体配位;3.0mol/LFeCl3溶液中Fe^3+的近邻配位为2个Cl^-和4个H2O中的O原子。0.8mol/LFeCl3溶液中Fe^3+的近邻配位有1个Cl^-和5个O原子。其结构无序相对较大,是Cl^-与O组成的扭曲八面体配位。
简介:ThisworkinvestigatedC2F6/O2/ArplasmachemistryanditseffectontheetchingcharacteristicsofSiCOHlow-kdielectricsin60MHz/2MHzdual-frequencycapacitivelycoupleddischarge.FortheC2F6/Arplasma,theincreaseinthelow-frequency(LF)powerledtoanincreasedionimpact,promptingthedissociationofC2F6withhigherreactionenergy.Asaresult,fluorocarbonradicalswithahighF/Cratiodecreased.Theincreaseinthedischargepressureledtoadecreaseintheelectrontemperature,resultinginthedecreaseofC2F6dissociation.FortheC2F6/O2/Arplasma,theincreaseintheLFpowerpromptedthereactionbetweenO2andC2F6,resultingintheeliminationofCF3andCF2radicals,andtheproductionofanF-richplasmaenvironment.TheF-richplasmaimprovedtheetchingcharacteristicsofSiCOHlow-kfilms,leadingtoahighetchingrateandasmoothetchedsurface.