简介：Anumericaltwo-fluidsimulationofthenon-ionizedradiofrequency(rf)sheathmodel,hasbeencarriedout.Thismodelis'global'andthusapplicabletothesheath,pre-sheathandplasmaregions,Inthemodelallvariablesintheionforcebalanceequation,includingtheelectricalforce,ionpressureandneutralparticlefriction,areconsidered.Themodelissolvedthroughafinitedifferenceschemeandsheathcharacteristicsareobtained.Theeffectsoftheiontemperatureonboththecollisionlessandcollisionalsheathcharacteristicsarediscussed.Thenitisconcludedthat1)themodelisinagoodagreementwithBohmTheorem;2)theiontemperaturehassignificanteffectsontherfsheathcharacteristics.Theeffectsarefarmoresignificantonacollisionalrfsheaththanonacollisionlesssheath.

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简介：Moleculardynamics(MD)simulationswereperformedtoinvestigateF+continuouslybombardingSiCsurfaceswithenergiesof100eVatdifferentincidentanglesat300K.Thesimulatedresultsshowthatthesteady-stateuptakeofFatomsincreaseswithincreasingincidentangle.Withthesteady-stateetchingestablished,aSi-C-Freactivelayerisformed.ItisfoundthattheetchingyieldofSiisgreaterthanthatofC.IntheF-containingreactionlayer,theSiFspeciesisdominantwithincidentangleslessthan30o.Forallincidentangles,theCFspeciesisdominantoverCF2andCF3.

简介：Simulationresultsofrougheningofnanocompositematerialsduringbothisotropicandanisotropicetchingprocessesbasedonthelevelsetmethodarepresented.Itisclearlyshownthatthepresenceoftwophaseswithdifferentetchingratesaffectsthedevelopmentofsurfaceroughnessandthatsomeroughnesscharacteristicsobeysimplescalinglaws.Inaddition,certainscalinglawsthatdescribethetimedependenceoftherootmeansquare(rms)roughnesswforvariousetchingprocessesanddifferentcharacteristicsofthenanocompositematerialsaredetermined.

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).

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简介：Theeffectsoflinearfallingrampresetpulserelatedtoaddressingoperationinanalternatingcurrentplasmadisplaypanel(ACPDP)werestudied.Thewallchargewaveformsweremeasuredbytheelectrodebalancemethodina12-inchcoplanarACPDP.Thewallchargewaveformsshowtherelationshipbetweenthesloperatioofthefallingrampresetpulseandthewallchargesattheendofthefallingrampresetpulsewhichinfluencestheaddressingstability.Thentheeffectsofthesloperatioofthelinearfallingrampresetpulseontheaddressingvoltageandaddressing,timewereinvestigated.Theexperimentalresultsshowthattheminimumaddressingvoltageincreaseswiththeincreaseofthesloperatioofthefallingrampresetpulse,andsodoestheminimumaddressingtime.Basedontheexperimentalresults,theoptimizationoftheaddressingtimeandthesloperatioofthefallingramppulseisdiscussed.

简介：Inthiswork,wesimulatenumericallythethermaleffectsinnitrogenatatmosphericpressurecausedbyanegativecoronaDCdischargeoflowcurrent.Amathematicalfunctionthatsimulatestheinjectionofthethermaltransferingasisproposed.Thesimulateddischargeisofanegativepointtoplanemasstype,withaninterelectrodedistanceof12mmandasymmetryabouttheaxisofdischarge.Thespatialandtemporalevolutionofneutralsisanalyzedbasedupontheequationsofcontinuity,momentumandenergyinacylindricalgeometry.Forthegeometryofthesystem,theFCT(fluxcorrectedtransport)procedurewasadopted.

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简介：AfewCT-basedvoxelphantomswereproducedtoinvestigatethesensitivityofMonteCarlosimulationsofX-raybeamandelectronbeamtotheproportionsofelementsandthemassdensitiesofthematerialsusedtoexpressthepatient'sanatomicalstructure.Thehumanbodycanbewelloutlinedbyair,lung,adipose,muscle,softboneandhardbonetocalculatethedosedistributionwithMonteCarlomethod.TheeffectsofthecalibrationcurvesestablishedbyusingvariousCTscannersarenotclinicallysignificantbasedonourinvestigation.ThedeviationfromthevaluesofcumulativedosevolumehistogramderivedfromCT-basedvoxelphantomsislessthan1%forthegiventarget.

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简介：Thecharacteristicsofhomogeneousdischargesinmixedgasesofhydrogendilutedsilaneandargonatatmosphericpressureareinvestigatednumericallybasedonaone-dimensionalfluidmodel.Thismodeltakesintoaccounttheprimaryprocessesexcitationandionization,sixteenreactionsofradicalswithradicalsinsilane/hydrogen/argondischargesandtherefore,canadequatelyrepresentthedischargeplasma.Weanalyzetheeffectsofveryhighfrequency(VHF)onthedensitiesofspecies(e,H,SiH3,SiH+3andSiH2)insuchdischargesusingthemodel.ThesimulationresultsshowthatthedensitiesofSiH3,SiH+3,H,andSiH2increasewithVHFwhentheVHFrangesfrom30MHzto150MHz.Itisfoundthatthedepositionrateofμc-Si:HfilmdependsontheconcentrationofSiH3,SiH+3,SiH2,andHintheplasma.TheeffectsofVHFonthedepositionrateandtheamountofcrystallizedfractionforμc-Si:Hfilmgrowthisalsodiscussedinthispaper.

简介：Theobjectiveofthispaperistodemonstratewhetherairplasmacanchangetheseedgerminationcharacteristics,seedlingemergence,aswellasbiochemicalreactivity,inAndrographispaniculata(A.paniculata)seedlingsbymodifyingtheseedcoatandfindingabeneficialtreatmentdose.Eighttreatmentdosesandonecontrolwereusedtoconductelectricalconductivitydetermination,agerminationtest,aseedlingemergencetestandabiochemicalassay.Theresultsshowedthatafterbeingtreatedwithairplasmaexcitedat5950Vfor10s,thepermeabilityoftheseedswasimprovedsignificantly,resultingintheaccelerationofseedgerminationandseedlingemergence.Inthemeantime,thecatalaseactivityandcatalaseisoenzymeexpressionwerealsoimproved,whilethemalondialdehydecontentintheseedlingswasdecreased(whichmeansgreatercounteractionwithenvironmentalstress).Afterbeingtreatedwith4250Vfor10sand5950Vfor20s,theseedgerminationwasenhanced,butwithoutanobviouschangeinseedlingemergence.However,aftertreatmentwith3400Vfor20sand5100Vfor10s,thepermeabilityoftheseedswasdecreased,resultinginadelayinseedlingemergence.TheseresultsindicatethatairplasmacanchangethephysiologicalandbiochemicalcharacteristicsofAndrographispaniculataseedsbymodifyingtheseedcoat,combinedwiththeeffectsoftheactiveplasmaspecies,andthatdifferenttreatingdoseshavedifferenteffects.

简介：ZnOnanowiresdepositedonSisubstrateswerepreparedbythermalevaporationofamixtureofZnOandcarbonpowder.Agionswithanenergyof63keVandadoseof5×1015ions/cm-2wereimplantedintotheas-preparedZnOnanowires.Afterionimplantation,theAg-implantedZnOnanowireswereannealedinairatdifferenttemperaturesfrom600℃to1000℃.Effectsofionimplantationandthermalannealingonthestructuralandphotoluminescent(PL)propertiesoftheZnOnanowireswereinvestigatedbytransmissionelectronmicroscopy(TEM),selectedareaenergydispersiveX-rayspectroscopy(SAEDX),X-raydiffraction(XRD),andfluorescencespectrophotometry.TEM,HR-TEM,andSAEDXanalysesdemonstratedthatefficientdopingofAgwasachievedbyionimplantationandthesubsequentannealingprocess.XRDpatternsrevealedthatthehexagonalwurtzitestructureofZnOnanowireswasmaintainedafterionimplantation.PhotoluminescentemissionsofZnOnanowiresweredecreasedsignificantlybyAgimplantationbutcouldberecoveredbythermalannealing.ThemechanismoftheinfluenceofionimplantationandannealingonthePLintensitywasassessed.

简介：Inthispaper,aone-dimensionparticle-in-cell(PIC)code(EDIPIC)isemployedtosimulatetheparallel-plateionextractionprocessunderanexternallyappliedelectrostaticfield,focusingontheanalysisoftheinflueneeoftheinitialelectrontemperatureontheextractedionfluxestothemetalplatesduringtheionextractionprocess.Comparedwithpreviouslypublishedresults,theplasmaoscillationsonatimescaleoftheelectronplasmaperiod,andtheexcitationoftheionacousticrarefactionwavesresultingfromtheplasmaoscillationsoriginatingfromboththenegativeandpositiveelectrodes,arestudiedforthefirsttime.Themodelingresultsshowthatboththenegativeandpositiveextractorscancollectionsduetotheplasmaoscillationsandthepropagationoftheionacousticrarefactionwaves.Withtheincreaseoftheinitialelectrontemperatureachievedbykeepingotherparametersunchanged,ontheonehand,boththeionspeedandfluxtothenegativeandpositiveplatesincrease,whichleadstoasignificantdecreaseoftheionextractiontime,whileontheotherhand,theionfluxtothepositiveplateaftertheformationofaChild-Langmuirsheathismuchmoresensitivetoanincreaseoftheinitialelectrontemperaturethanthattothenegativeplate.ThePICsimulationresultsprovideadeeperphysicalunderstandingoftheinfluenceoftheinitialelectrontemperatureonthecharacteristicsoftheentireionextractionprocessinadecayingplasma.

简介：Laser-inducedbreakdownspectroscopy(LIBS)hasattractedextensiveattentionasanewtechniqueforin-situmarineapplication.Inthiswork,theinfluenceofdeep-seahighpressureenvironmentonLIBSsignalswasinvestigatedbyusingacompactLIBS-seasystemdevelopedbyOceanUniversityofChinaforthein-situchemicalanalysisofseawater.TheresultsfromthefieldmeasurementsshowthattheliquidpressurehasasignificanteffectontheLIBSsignals.Higherpeakintensityandlargerlinebroadeningwereobtainedasthepressureincreases.BycomparingthevariationsofthetemperatureandsalinitywiththeLIBSsignals,aweakcorrelationbetweenthemcanbeobserved.Underhighpressureconditions,theoptimallaserenergywashigherthanthatinairenvironment.Whenthelaserenergyexceeded17mJ,theeffectoflaserenergyonthesignalintensityweakened.Thesignalintensitydecreasesgraduallyatlargerdelays.TheobtainedresultsverifiedthefeasibilityoftheLIBStechniqueforthedeep-seain-situdetection,andwehopethistechnologycancontributetosurveyingmoredeep-seaenvironmentssuchasthehydrothermalventregions.

简介：Thispaperpresentstheresultsofaluminumsurfacetreatmentbydiffusecoplanarsurfacebarrierdischarge.Thegoalsaretostudytheeffectivenessoftheplasmatreatmentandthedependenceofitsefficiencyonoperationparameters,suchassample-to-electrodedistance,treatmenttimeorgasatmosphere.Threetypesofaluminummaterials(bricks,sheetsandthinfilms)weretestedtoensurethereliabilityofthetreatment.Thechangesinthesurfacepropertieswerecharacterizedbythesurfacefreeenergy,atomicforcemicroscopy,attenuatedtotalreflectanceFouriertransforminfraredspectroscopy(ATRFTIR)andX-rayphotoelectronspec-troscopy(XPS).Theinfluenceofagingeffectonthetreatmentwasalsomeasuredanddiscussed.

简介：GaInP/GaAs/Getriple-junctionsolarcellswereirradiatedwith50keVand100keVprotonsatfluencesof5×1010cm-2,1×1011cm-2,1×1012cm-2,and1×1013cm-2.Theirperformancedegradationisanalyzedusingcurrent-voltagecharacteristicsandspectralresponsemeasurements,andthenthechangesinIsc,Voc,Pmaxandthespectralresponseofthecellsareobservedasfunctionsofprotonirradiationfluenceandenergy.Theresultsshowthatthespectralresponseofthetopcelldegradesmoresignificantlythanthatofthemiddlecell,and100keVproton-induceddegradationratesofIsc,VocandPmaxarelargercomparedwith50keVprotonirradiation.

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