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24 个结果
  • 简介:ApresentstatusofthediagnosticsinEASTispresented.AsaveryimportantstepoftheEASTproject,tensofdiagnosticswereemployedforoperationandprotectionofthemachine,plasmacontrolandphysicsanalysistoaccommodaterequirementforthestudyonplasmaperformanceinEASTwithupgradedradiofrequency(RF)injectionpowerupto4MW(bothLHCDandICRF)intheforthcomingyears.Recently,newdiagnosticsaresetuptoprovideseveralprofilesofkeyplasmaparametersforthefurtherevaluationandbetterunderstandingoftheplasmaperformanceandphysicsinEAST,includinga25-channelThomsonscatteringsystemfordensityandelectrontemperature,ametalbolometryforradiatedpower,anX-raycrystalspectroscopyforbothionandelectrontemperaturesandplasmarotationvelocity,etc.Itisexpectedthatthesediagnosticswouldplayanimportantroleindataanalysisandinterpretationcombinedwithintegratedmodeling.

  • 标签: 诊断 等离子体性能 低杂波电流驱动 等离子体参数 ICRF 电子温度
  • 简介:Aspectraldiagnosticsofcomplexareplasmausingmultiplespectralinformationofareself-emittingispro-posed.Thismethodisabletosimultaneouslydeterminecomponentdensities,thecorrespondingtemperatureandtheirdis-tributionsbyafewlineintensitiesmeasurent.Theprincipleofthemethodandtherelevantmeasuringsystemarede-scribed.Anequationsystemisestablishedforcomputationofthestatevariablesinareplasma.Anexperimentunderweldingareconditionismadeasanapplicationofthemethod.Theeffectsofprobableerrorsourcesonthemeasurementarealsoanalysed.

  • 标签: SPECTRAL DIAGNOSTICS COMPONENT DENSITIES WELDING ARC
  • 简介:Twodiagnosticsarepresentedforthetransformationofexplanatoryvariablesinregression.OneisbasedonthelikelihooddisplacementproposedbyCookandWeisberg(1982)forassessingtheinfluenceofindividualcasesonthemaximumlikelihoodestimateofatransformationparameter.Theotherisbasedonthelocalin-fluencetheoryproposedbyCook(1986)forassessingtheinfluenceofsmallperturba-tionsontheparameterestimates.Computationsarcperformedforadatasettoillus-tratetheusefulnessofthesediagnostics.

  • 标签: LIKELIHOOD DISPLACEMENT local influence PERTURBATIONS
  • 简介:InthispaperwereviewtheprovisionofthelaserdiagnosticsthatareinstalledontheVulcanlaserfacility.Wewillpresentstrategiesfordealingwiththeenergyofhighenergysystemsandwithwaysofhandlingthebeamsizesofthelasers.Wepresentdatacapturedduringtypicalexperimentalcampaignstodemonstratetheirreliabilityandvariationinshottoshotvalues.

  • 标签: CALORIMETER HIGH power LASER LASER DIAGNOSTICS
  • 简介:Thispapermainlyinvestigatesplasmacharacterizationoncarbonfibercathodeswithandwithoutcesiumiodide(CsI)coatingpoweredbya~300ns,~200kVacceleratingpulse.ItwasfoundthattheCsIlayerscannotonlyimprovethediodevoltage,butalsomaintainastableperveance.Thisindicatesaslowlychangeddiodegaporalowcathodeplasmaexpansionvelocity.Byspectroscopicdiagnostics,inthevicinityofthecathodesurfacetheaverageplasmadensityandtemperaturewerefoundtobe~3×1014cm3and~5eV,respectively,foranelectroncurrentdensityof~40A/cm2.Furthermore,thereexistsamulticomponentplasmaexpansiontowardtheanode.Theplasmaexpansionvelocity,correspondingtothecarbonandhydrogenions,isestimatedtobe~1.5cm/μs.Mostnotably,Csspectroscopiclinewasobtainedonlyatthedistance≤0.5mmfromthecathodesurface.Carbonandhydrogenionsareobtaineduptothedistanceof2.5mmfromthecathodesurface.Csionsalmostremainatthevicinityofthecathodesurface.TheseresultsshowthattheadditionofCsIenablesaslowcathodeplasmaexpansiontowardtheanode,providingapositiveprospectfordevelopinglong-pulseelectronbeamsources.

  • 标签: 等离子体阴极 等离子体特性 光谱诊断 碳纤维 等离子体密度 电子束源
  • 简介:Muonsproducedbyashortpulselasercanserveasanewtypeofmuonsourcehavingpotentialadvantagesofhighintensity,smallsourceemittance,shortpulsedurationandlowcost.Tovalidateitinexperiments,asuitablemuondiagnosticssystemisneededsincehighmuonfluxgeneratedbyashortpulselasershotisalwaysaccompaniedbyhighradiationbackground,whichisquitedifferentfromcasesingeneralmuonresearches.Adetectionsystemisproposedtodistinguishmuonsignalsfromradiationbackgroundbymeasuringthemuonlifetime.Itisbasedonthescintillatordetectorwithwaterandleadshields,inwhichwaterisusedtoadjustenergiesofmuonsstoppedinthescintillatorandleadtoagainstradiationbackground.AGeant4simulationontheperformanceofthedetectionsystemshowsthatefficiencyupto52%couldbearrivedforlow-energymuonsaround200MeVandthisefficiencydecreasesto14%forhigh-energymuonsabove1000MeV.Thesimulationalsoshowsthatthemuonlifetimecanbederivedproperlybymeasuringattenuationofthescintillalightofelectronsfrommuondecaysinsidethescintillatordetector.

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  • 简介:Theobjectiveofthispaperistodevelopaneuralnetwork-basedresidualgeneratortodetectthefaultintheactuatorsforaspecificcommunicationsatelliteinitsattitudecontrolsystem(ACS).First,adynamicmultilayerperceptronnetworkwithdynamicneuronsisused,theseneuronscorrespondtoasecondorderlinearInfiniteImpulseResponse(IIR)filterandanonlinearactivationfunctionwithadjustableparameters.Second,theparametersfromthenetworkareadjustedtominimizeaperformanceindexspecifiedbytheoutputestimatederror,withthegiveninput-outputdatacollectedfromthespecificACS.Then,theproposeddynamicneuralnetworkistrainedandappliedfordetectingthefaultsinjectedtothewheel,whichisthemainactuatorinthenormalmodeforthecommunicationsatellite.Thentheperformanceandcapabilitiesoftheproposednetworkweretestedandcomparedwithaconventionalmodel-basedobserverresidual,showingthedifferencesbetweenthesetwomethods,andindicatingthebenefitoftheproposedalgorithmtoknowtherealstatusofthemomentumwheel.Finally,theapplicationofthemethodsinasatellitegroundstationisdiscussed.

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  • 简介:AbstractCongenital heart disease (CHD) is the most common birth defect worldwide. In recent years, the widespread application of innovative molecular diagnostic technologies in clinical scenarios has obviously increased the molecular diagnostic yields of CHD, providing evidence-based guidance for medical decision-making. These molecular diagnostic technologies include chromosome microarray analysis, targeted sequencing, exome sequencing, and genome sequencing. Furthermore, high-throughput sequencing technology has performed excellently in the clinical molecular diagnosis of CHD. This review provides an overview of the current technology and applications in the molecular diagnosis of CHD. The unmet issues and future directions in adapting novel genomic testing technologies to the molecular diagnosis of CHD in clinical settings are also addressed.

  • 标签: congenital heart diseases diagnostic yield molecular diagnosis whole exome sequencing whole genome sequencing
  • 简介:ThisstudypresentstheLangmuirandFaradayprobemeasurementsconductedtodeterminetheplumecharacteristicsoftheBUSTLabmicrowaveelectrothermalthruster(MET).Thethruster,designedtooperateat2.45GHzfrequency,isrunwithhelium,argonandnitrogengasesasthepropellant.Forthemeasurements,thepropellantvolumeflowrateandthedeliveredmicrowavepowerlevelsarevaried.Experimentswithnitrogengasrevealedcertainoperationregimeswhereaveryluminousplumeisobserved.Withtheuseofin-house-builtLangmuirprobesandaFaradayprobewithguardring,thrusterplumeelectrontemperature,plasmadensityandioncurrentdensityvaluesaremeasured,andtheresultsarepresented.ThemeasurementsshowthatMETthrusterplumeeffectsonspacecraftwilllikelybesimilartothoseofthearcjetplume.Itisobservedthatthemeasuredplumeionfluxlevelsareverylowforthehighvolumeflowratesusedfortheoperationofthisthruster.

  • 标签: MICROWAVE ELECTROTHERMAL THRUSTER plasma DIAGNOSTICS PLUME
  • 简介:Inthisarticle,thejointdistributionsofseveralactuarialdiagnosticswhichareimportanttoinsurers’runningforthejump-diffusionriskprocessareexamined.Theyincludetheruintime,thetimeofthesurplusprocessleavingzeroultimately(simply,theultimatelyleaving-time),thesurplusimmediatelypriortoruin,thesupremeprofitsbeforeruin,thesupremeprofitsanddeficituntilitleaveszeroultimatelyandsoon.TheexplicitexpressionsfortheirdistributionsareobtainedmainlybythevariouspropertiesofL′evyprocess,suchasthehomogeneousstrongMarkovpropertyandthespatialhomogeneitypropertyetc,moveover,themanypropertiesforBrownianmotion.

  • 标签: 联合分布 扩散过程 年度报告 诊断 精算 跳跃
  • 简介:ChargedparticlediagnosticsisoneoftherequiredtechniquesforimplosionarealdensitydiagnosticsattheSG-IIIfacility.Severalprotonspectrometersareunderdevelopment,andsomepreliminaryarealdensitydiagnosticshavebeencarriedout.Theresponseofthekeydetector,CR39,tochargedparticleswasinvestigatedindetail.Anewtrackprofilesimulationcodebasedonasemi-empiricalmodelwasdeveloped.TheenergyresponseoftheCR39detectorwascalibratedwiththeacceleratorprotonsandalphasfroma241Amsource.AprotonspectrometerbasedonthefilteredCR39detectorwasdeveloped,andD–Dprimaryprotonmeasurementswereimplemented.Asteprangefilterspectrometerwasdeveloped,andpreliminaryarealdensitydiagnosticswascarriedout.AwedgedrangefilterspectrometerarraymadeofSiwithahigherresolutionwasdesignedanddevelopedattheSG-IIIfacility.AparticleresponsesimulationcodebytheMonteCarlomethodandaspectraunfoldingcodeweredeveloped.Thecapabilitywasevaluatedindetailbysimulations.

  • 标签: areal density DIAGNOSTICS CR39 detector SRF
  • 简介:Anewtime-resolvedshifteddualtransmissiongratingspectrometer(SDTGS)isdesignedandfabricatedinthiswork.ThisSDTGSusesanewshifteddualtransmissiongrating(SDTG)asitsdispersivecomponent,whichhastwosubtransmissiongratingswithdifferentlinedensities,of2000lines/mmand5000lines/mm.TheaxesofthetwosubtransmissiongratingsinSDTGarehorizontallyandverticallyshiftedacertaindistancetomeasureabroadrangeof0.1–5keVtime-resolvedX-rayspectra.TheSDTGhasbeencalibratedwithasoftX-raybeamofthesynchrotronradiationfacilityanditsdiffractionefficiencyisalsomeasured.ThedesignedSDTGScantakefulluseofthespaceonarecordpanelandimprovetheprecisionformeasuringspatialandtemporalspectrumsimultaneously.ItwillbeapromisingapplicationforaccuratediagnosisofthesoftX-rayspectrumininertialconfinementfusion.

  • 标签: 透射光栅光谱仪 时间分辨 光谱诊断 X射线谱 设计 位移
  • 简介:Temperatureanddensityasymmetrydiagnosisiscriticaltoadvanceinertialconfinementfusion(ICF)science.Amultimonochromaticx-rayimager,MMI,recordsthespectralsignaturefromanICFimplosioncorewithtimeresolution,2Dspatialresolutionandspectralresolution.Whilenarrow-bandimagesand2Dspace-resolvedspectrafromtheMMIdataconstrainthetemperatureandthedensityspatialstructureofthecore,theaccuracyoftheimagesandthespectrahighlydependsonthequalityoftheMMIdataandtheprocessingtools.Here,wesyntheticallyinvestigatethecriterionforreliableMMIdiagnosticsanditseffectsontheaccuracyofthereconstructedimages.Thepinholearraytiltdeterminestheobjectspatialsamplingefficiencyandtheminimumreconstructionwidth,w.Whenthespectralwidthassociatedwithwissignificantlynarrowerthanthespectrallinewidth,thelineimagesreconstructedfromtheMMIdatabecomereliable.TheMMIsetuphastobeoptimizedforeveryapplicationtomeetthiscriterionforreliableICFdiagnostics.

  • 标签: high power laser INERTIAL CONFINEMENT fusion