简介:Theβ-decaysofneutron-richcarbon,nitrogenandfluorineisotopeshavebeensys-tematicallystudiedusingtheOXBASHshellModel.Inthepsd,spsdandspsdpfmodelspace,weusetheWBPinteractiontocalculatethehalf-livesandneutronemissionprobabilitiesofneutron-richcarbonandnitrogenisotopes,respectively.WiththeUSD(W)andCWinteractions,wecalculatethehalf-livesandneutronemissionprobabilitiesofneutron-richfluorineisotopeinthesdmodelspace,respectively.Thecalculatedhalf-livesandneutronemissionprobabilitiesrepro-ducerecentexperimentaldataverywell.Itseemstoshowthattheparticlesoftheneutron-richcarbonandnitrogenisotopesaremainlyexcitedinthespsdspace.Theβ-decayof21Ntotheneutronboundstatesin21Oismostlythefirstforbiddentransitionwhichmakestheneutronemissionprobabilityincrease.Thetheoreticalcalculationofβ-decayof25Fto25NewithCWinteractionshowsthatCWinteractionisbetterthanUSDinteraction.
简介:Theelectrostaticsheathwithacylindricalgeometryinanion-electronplasmaisinvestigated.AssumingaBoltzmannresponsetoelectronsandcoldionswithbulkflow,itisshownthattheradiusofthecylindricalgeometrydonotaffectthesheathpotentialsignificantly.Wealsofoundthatthesheathpotentialprofileissteeperinthecylindricalsheathcomparedtotheslabsheath.Thedistinctfeatureofthecylindricalsheathisthattheiondensitydistributionisnotmonotonous.Thesheathregioncanbedividedintothreeregions,twoascendantregionsandonedescendantregion.
简介:Thegenerationofplasmawhichcanabsorbmicrowavesiscurrentlyaresearchtopicofinterest.Thiskindofplasmaisoftenproducedbythedischargeorelectron-beamimpactofnoblegases.Inthispaperanalternaticeapproach,combustionplasma,isstudied.Theplasmaisproducedbycombustingsolidgrainspreparedspecially.Sixgroupsofpowdersweremadeandusedtogeneratetheplasma.Thetransmissivityofthewaveinplasmawasmeasuredbyemployingamicrowavescalarnetworkanalysersystem.Inaddition,theelectrondensityandthecollisionfrequencyoftheplasmawereexaminedbymicrowavedouble-frequencydiagnosis.Themeasurementresultsshowedthattheplasmacouldabsorbmicrowavesremarkablywithanaveragetransmissionattenuationbeingmorethan18dBinafrequencyrangeof2GHzto15GHz.Thediagnosisindicatedthattheelectrondensityoftheplasmavariedfrom10~(17)m~(-3)to10~(19)m~(-3)andthecollisionfrequencywasabout5×10~(10)s~(-1).
简介:Plasmasourceperformanceparameters,includingplasmaejectiondensityandvelocity,greatlyaffecttheoperationofashort-conduction-timeplasmaopeningswitch(POS).Inthispaper,theplasmasourceusedinthePOSofQiangguangIgeneratorischosenasthestudyobject.AtfirstthePOSworkingprocessisanalyzed.TheresultshowsthattheopeningperformanceofthePOScanbeimprovedbyincreasingtheplasmaejectionvelocityanddecreasingtheplasmadensity.Theinfluenceofthecableplasmagunstructureandnumberontheplasmaejectionparametersisexperimentallyinvestigatedwithtwochargecollectors.Finallyasemi-empiricalmodelisproposedtodescribetheexperimentalphenomenon.
简介:Opticalemissionspectroscopy(OES)wasappliedforplasmacharacterizationduringtheerosionofasphaltenesubstrates.Anamountof100mgofasphaltenewascarefullyappliedtoanelectrodeandexposedtoair-plasmaglowdischargeatapressureof1.0Torr.Theplasmawasgeneratedinastainlesssteeldischargechamberbyanacgeneratoratafrequencyof60Hz,outputpowerof50Wandagasflowrateof1.8L/min.Theelectrontemperatureandiondensitywereestimatedtobe2.15±0.11eVand(1.24±0.05)×1016m-3,respectively,usingadoubleLangmuirprobe.OESwasemployedtoobservetheemissionfromtheasphalteneexposedtoairplasma.BothmolecularbandemissionfromN2,N+2,OH,CH,NH,O2aswellasCN,andatomiclightemissionfromVandHγwereobservedandusedtomonitortheevolutionofasphalteneerosion.Theasphalteneerosionwasanalyzedwiththeaidofascanningelectronmicroscope(SEM)equippedwithanenergydispersiveX-ray(EDX)detector.TheEDXanalysisshowedthatthetimeevolutionofelementsC,O,SandVweresimilar;andthechemicalcompositionoftheexposedasphaltenesremainedconstant.Particlesizeevolutionwasmeasured,showingamaximumsizeof2307μmafter60min.Thisbehaviorismostlikelyrelatedtoparticleagglomerationasafunctionoftime.
简介:一个表面波浪激动的血浆列能充当一条血浆天线。实验被执行学习电流和传导性如此的一条血浆天线的分布,领域,功率模式,择向性和效率。另外,一条相等的金属性的铜天线被建立,它的天线参数与血浆天线的相比。我们的调查结果显示在血浆天线的泛音的力量内容是与铜天线相比同样突出的更多(它仅仅产生基本频率)。然而,为两条天线的力量模式是相当类似的。在血浆天线的领域里关于泛音的产生提供更质的理解,双性人光谱的分析被执行在当前的变化学习非线性的相互作用。血浆天线的一些特定的特征在我们的学习被调查,它可以关于常规金属性的天线提高血浆天线的申请前景。
简介:Bohmcriterioninamagnetizedplasmasheathisinvestigatedwithafluidmodel.Theupperandlowerlimitsforthesheathcriterionindifferentstatesofappliedmagneticfieldarestudied.TheresultsfromnumericalsimulationrevealthatthemagneticfieldaffectssignificantlytheionMachnumber.ThevariationoftheionMachnumberwiththeincidentangleoftheionsisalsopresented.
简介:Hugoniotrelationsofatwo-dimensionalaxialshockwithcurrentandmagneticfieldinacylindricalshocktubewereinvestigatedbyanumericalmethod.Theradialprofilesofthemagneticfield,electriccurrent,pressures,flowvelocitiesandtemperaturesbetweentheupanddown-streamradialforce-balancedplasmaoftheshockwererevealedbynumericalanalysis.Itisclearlyfoundthattheaxialshockcanleadtotwoeffects:oneisaninverseskineffect(i.e.,thecurrentdensityrisestowardsthecenteroftheconductor),theanotherisareversedcurrenteffectwhichoccursneartheedgeandaboutahalfradius.Itisalsofoundthattheradialgradientofpressure,densityandtemperatureallbecomeverylargenearthecenterduetotheaxialshock.
简介:Energydepositionofintensepulsedionbeam(IPIB)ontheTitargetbasedonthe2DmodelofIPIBdensityhasbeensimulatedbytheMonteCarlo(MC)method.Takingthedepositedenergyasthethermalsource,wehaveestablishedtheablationmodelofthetargetandcalculatedthespatialandtemporalevolutionoftheablationshapeoftheTitargetirradiatedbyIPIBwithdifferentenergydensities.WehavealsoestablishedtheejectionmodelofthehydrodynamicequationsrelatedtotheablationshapeofthetargetbyusingtheablationresultsastheinitialconditionsofplasmaformedbyIPIBirradiation.Thespatiallyandtemporallyevolutedprofilesoftheplasmapressureandmassdensityarecalculated.
简介:Theapplicationofinductionplasmatechnologydevelopedforthesynthesisofnanometricpowdersissummarized.Abriefdescriptionofthescientificbasisfortheinductionplasmaprocessesisgiven,followedbythepresentationofaninductionplasmasystemdevelopedbyTekna,togetherwithvariousexamplesofthenanopowderssynthesizedusingitsfacilities.Theadvantagesoftheinductionplasmaprocessoveralternativetechniquesanditsadaptabilityintoindustrialscaleoperationisparticularlyillustrated.Somespecificissuesrelatedtothenanopowdersynthesisprocessarealsodiscussed.
简介:AnexperimentalsystemofACarcdischargeinwaterwasdesignedwithpole-poleelectrodesandapeakvoltageof1500Vandatestcircuitwassetupusingvirtualinstrumenttechnology.ThemechanismofanACplasmaarcgeneratedinwaterwasanalyzed.ThevoltagecurrentcharacteristicoftheACplasmaarcwasobtainedfromthewaveform.Thetemperaturecharacteristicwastestedwithaspectrumdiagnosissystem,andtheeffectofdifferentelectrodematerialsonthestrikingvoltageandpeakcurrentwasanalyzed.Theresultsshowthatwhenapowersupplyof6kWisappliedonelectrodeswithagapof2mminwater,thestrikingvoltageisfrom900Vto1300V,thearcvoltageisfrom40Vto100V,thearccurrentisfrom2Ato7A,andthezerorestperiodisfrom1msto2ms.Inaddition,thearcvoltageandcurrentaredifferentforelectrodesinaluminum,copperandstainlesssteel.Thearcvoltageislowerandthecurrentishigherforanaluminumelectrodethanthoseforcopperandstainlesssteelones.Thehighesttemperatureofthearcis7643K.
简介:SupersonicMolecularBeamInjection(SMBI)isanewfuellingmethodforTokamaksandhasrecentlybeenimprovedtoenhancethefluxofthebeamandtomakeasurveyoftheclustereffectwithinthebeam.Thereareaseriesofnewphenmnena,whichimplicatetheinteractionofthebeam(includingclusters)withthetoroidalplasmaofHiL-1MTokamak.TheHαsignalsfromtheedgeshowaregularvariationaroundthetorus.Aroundtheinjectionport,theedgeHαsignalsarepositiverectangularwave,whichisconsistentwiththatoftheinjectionbeampulses.Theedgeelectrontemperature,measuredwithmovableLangmuirprobes,decreasesbyanorderofmagnitudeandthedensityincreasesbyanorderofmagnitude.Hαemissionatthebeaminjectionport,measuredwithCCDcameraatanangleof13.4degreestotheSMBIline,showsmanyseparatepeakswithinthecontourplot.Thesepeaksmayshowthestrongemissionproducedbytheinteractionofthehydrogenclusterswiththeplasma.Hydrogenclustersmaybeproducedinthebeamaccordingtotheempiricalscaling(Hagena)lawofclusteringonset,heredisthenozzlediameterinμm,P0thestaguationpressureinmbar,T0thesourcetenperatureinK,andkisaconstantrelatedtothegasspecies.IfΓ*>100,clusterswillbeformed.InpresentexperimentΓ*isabout127.
简介:Theplasmageneratedinthelow-altitudeatmosphereisofhighcollisionfrequencies.Inthispaper,thetransmissioncoefficientsofmillimeter(MM)wavesnormallyincidentupontheplasmawithhighcollisionfrequenciesarecalculatedandanalyzed.Theexperimentalresultsofreflectionandattenuationarepresentedfortheeight-millimeterwavespropagatingthroughtheplasma.BoththecalculatedexperimentalresultsindicatethattheMM-wavesconcernedareattenuatedsignificantlyandreflectedweakly,whenpropagatingthroughtheplasmaofhighcollisionfrequencies.
简介:Modelingofcarbonmonoxide(CO)removalbyacoronaplasmawasconductedinthisstudy.ThepurificationefficiencyofCOwascalculatedtheoreticallyandthefactorsaffectingtheremovalofCOwereanalyzed.TheresultsshowedthatthemainremovalmechanismsofCOweredirectdissociationbygeneratedhigh-energyelectronsandindirectoxidationbygeneratedhydroxylradicals.ThepurificationefficiencyofCOwasdependentontheplasmaparameters,indoorairhumidityandinitialconcentrationofCO.Goodconsistencybetweenthetheoreticalcalculationandtheexperimentalresultswasobserved.
简介:Newmethodsforboththetreatmentofpulpwasteliquorcalledblackliquor(BL)andtherecoveryofchemicalsbyusingplasma,andtheconcentrationofBLwiththefreezingtechniqueweredeveloped.Thenewmethodsaimingatthepilotplantscalearedescribedandtheexperimentsinasmall-scaleresearchfacilityfordemonstrationandtestarepresented.Theenergyconsumptionfortreatingwasteliquidis1kg/kWh.Plasmaprocessingcanreducethecostsfortreatmentandeliminatepollution.
简介:Ananalyticalstudyispresentedonthemodaldispersioncharacteristics,groupvelocity,andeffectivegroup,aswellasthephaseindexofaternaryonedimensionalplasmaphotoniccrystalforanobliquelyincidentelectromagneticwaveconsideringtheeffectofcollisionsinplasmalayers.Thedispersionrelationisderivedbyusingthetransfermatrixmethodandtheboundaryconditionsbasedonelectromagnetictheory.Thedispersioncurvesareplottedforboththenormalphotonicbandgapstructureandtheabsorptionphotonicbandgapstructure.Itisfoundthattheincreaseintheangleofincidenceshiftsthephotonicbandgaptowardhigherfrequencies.Also,thecutofffrequencyisindependentofcollisions.
简介:Inthepaper,relativisticfilamentationofintenselaserbeamininhomogeneousplasmaisinvestigatedbasedonthenonparaxialregiontheory.Theresultsshowthat,relativisticnonlinearityplaysamainroleinbeamfilamentation,andplasmainhomogeneityfurtherreinforcesthebeamfilamentation.Thecombinationeffectsofrelativisticnonlinearityandplasmainhomogeneitycangenerateparticularlyintenseandshortpulselaser.However,plasmainhomogeneityleadstoobviousfilamentationinstability.