简介:Asecondgenerationsolaradaptiveoptics(AO)systemisbuiltandinstalledatthe1-mNewVacuumSolarTelescope(NVST)oftheFuxianSolarObservatory(FSO)in2015.TheAOhigh-ordercorrectionsystemconsistsofa151-elementdeformablemirror(DM),acorrelatingShack–Hartmann(SH)wavefrontsensor(WFS)witha3500Hzframerate,andareal-timecontroller.ThesystemsawfirstlightonMar.16,2015.Thesimultaneoushigh-resolutionphotosphereandchromosphereimageswithAOareobtained.Theon-skyobservationalresultsshowthatthecontrastandresolutionoftheimagesareapparentlyimprovedafterthewavefrontcorrectionbyAO.
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简介:BasedontheopticaldatafortransmittedradiationthroughseaiceintheArcticduringthelateautumnandearlywinterof2007,theauthorsstudiedthearrivingsolarradiation,reflectedradiationandtransmittedradiationunderverylowsolaraltitude.Throughtheatmosphere,thelightofthearrivingsolarradiationatshortwavelengthwasweakened,withthespectraldistributionofdoublepeakscenteredat490nmand683nm.Themagnitudeofthepeakat683nmevenexceededthatat490nmundertheverylowsolarradiationcondition.Thereflectionwaslowerthanthatinsummertimebecauseofthethinthicknessesoficeandsnow,allowinghigherratioofheattoentertheseaiceandsnow.Whenhigherratioofsolarradiationenteredseaiceinlateautumn,thenewicefreezingwouldbeaffected.Thespectralreflectivityfromsnowsurfacewasalmostaconstant,butthereflectionwithoutsnowde-creasedatlongerwavelengths.Inthetransmissionspectrum,thelightof490nmwasdominant.Itindicatesthattheradiationatlongerwavelengthwasweakenedbyseaice.Therefore,undertheconditionoflowsolaraltitude,theradiationatshorterwavelengthwasweakenedbytheatmospherewhiletheradiationatlongerwavelengthwasweakenedbytheseaice.Thecombinedeffectofat-mosphereandseaicemadethesolarradiationunderseaicemuchweaker.Theabsorptionofseaiceforthelonger-wavelengthradiationallowedtheseaicetogainmoreheattoslowdownthefreezingprocess.
简介:Collectingwoodwasarealpaininthefore-head.Weusedtogototheforesttocollectwoodthirtytimesorsoeachwinterregardlessofthesnoworwind.Wehadtogetupanhourorsoaftermidnightandafterdoingourchoreswewouldheadofftotheforest.Wedidn’treturnuntildusk,"saidMs.Zhongcujia,aged52andaresidentofNiamuorFishVillage,locatedinJiancaCounty,MalhoTibetanAutonomousPrefecture,QinghaiProvince,China.FishVillageisnestledonadenud-edwest-facingmountainslope.
简介:Magnetohydrodynamicsisoneofthemajordisciplinesinsolarphysics.Vigorousmagnetohydrodynamicprocessistakingplaceinthesolarconvectionzoneandatmosphere.Itcontrolsthegeneratingandstructuringofthesolarmagneticfields,causestheaccumulationofmagneticnon-potentialenergyinthesolaratmosphereandtriggerstheexplosivemagneticenergyrelease,manifestedasviolentsolarflaresandcoronalmassejections.Nowadaysdetailedobservationsinsolarastrophysicsfromspaceandonthegroundurgeagreatneedforthestudiesofmagnetohydrodynamicsandplasmaphysicstoachievebetterunderstandingofthemechanismormechanismsofsolaractivity.Ontheotherhand,thespectacularsolaractivityalwaysservesasagreatlaboratoryofmagnetohydrodynamics.Inthisarticle,wereviewedafewkeyunresolvedproblemsinsolaractivitystudiesanddiscussedtherelevantissuesinsolarmagnetohydrodynamics.
简介:Thetwo-streamapproximationisappliedtosolvethemultiplescatteredradiationtransferequationsforaninhomogeneousaerosolatmosphere.Theaccurateabsorptionofwatervapor,ozone,carbondioxideandmolecularoxygeniscalculated.Calculationshavebeencarriedoutbandbybandforthebeatingrateofatmosphere.Theresultsshowthattheeffectofaerosolsonsolarheatingoftheatmosphereissignificant.
简介:ZnTe/ZnTe∶Culayerisusedasacomplexbackcontact.TheparametersofCdTesolarcellswithandwithoutthecomplexbackcontactsarecompared.Theeffectsofun-dopedlayerthickness,dopedconcentrationandpost-depositionannealingtemperatureofthecomplexlayeronsolarcellsperformanceareinvestigated.TheresultsshowthatZnTe/ZnTe∶CulayercanimprovebackcontactsandlargelyincreasetheconversionefficiencyofCdTesolarcells.Un-dopedlayerandpost-depositionannealingofhightemperaturecanincreaseopenvoltage.Usingthecomplexbackcontact,asmallCdTecellwithfillfactorof73.14%andconversionefficiencyof12.93%isobtained.
简介:RelationshipbetweenglobalseismicityandsolaractivitiesGUI-QINGZHANG(张桂清)BeijingAstronomicalObservatory,ChineseAcademyofScience...
简介:Thepreparation,currentstatusandtrendsareinvestigatedforsiliconthinfilmsolarcells.Theadvantagesanddisadvantagesofamorphoussiliconthinfilm,polycrystallinesiliconthinfilmandmono-crystallinesiliconthinfilmsolarcellsarecompared.Thefuturedevelopmenttrendsarepointedout.Itisfoundthatpolycrystallinesiliconthinfilmsolarcellswillbemorepromisingforapplicationwithgreatpotential.
简介:ALABORATORYTESTFACILITYFORSOLARRADIATIONINSTRUMENTSANDITSAPPLICATIONS¥LuWenhua(吕文华)andMoYueqin(莫月琴)ALABORATORYTESTFACILITYFOR...
简介:Theeffectofhydrogenpassivationonmulticrystallinesilicon(mc-Si)usedforsolarcellsisdescribed,andthemechanismofhydrogendiffusionandpassivationisalsoinvestigated.Then,thehydrogenpassivationprocessesappliedinindustriesandresearchlaboratoriesareintroduced.Finallytheexistingproblemsandtheprospectsofhydrogenpassivationarereviewed.
简介:Thisstudydefinesandassessestheselectionciiteriaforsuitableparticulatematerialstobeusedinanupflowbubblingfluidizedbed(UBFB)ordenseup-flowpowdercirculationsystemforsolarenergycaptureandstorage.Themaincriteriaidentifiedarebasedonthethermophysicalandthermomechanicalproperties,attritionbehavior,andtheconsiderationsofhealthandenvironmentalhazardsofthecandidatepowders.Finally,acostcomparisonandtentativerankingofthedifferentcandidatepowdersispresentedinadditiontoaweightedscoring.Significantscoringdifferencescanbeobservedbetweenthevariousmaterials.Olivinepossessesthemostfavorablecharacteristicsandappearstobetheparticulatematerialofchoiceforsolid/gassuspensionheattransferfluids.