共查询到20条相似文献,搜索用时 375 毫秒
1.
1 IntroductionThe〔CII〕1 5 8μm ( 2 P3 /2 →2 P1/2 )emissionlineoftendominatesthegascoolingintheneu tralphaseofthegalacticISM (interstellarmedium) .ThislineiswellcorrelatedonagalacticscalewithFIR (far-infrared)continuum ,whichtracesthecoolingofdustgrains.Nearlyconstantin… 相似文献
2.
1 IntroductionThemagneticfieldandmaterialmotionhavealwaysbeenthepointstowhichcloseatteneionispaidinthestudyofsolarflareprocess.Especiallythetwistingenergystorgeprocessisaprob lemthatauthorsofmanyflaretheoriesandmodelshopetoresolve .Gold&Holye ( 1 96 0 ) pres… 相似文献
3.
1 IntroductionSingleStellarPopulations (SSPs)arethebasicbuildingblocksofsyntheticspectraofgalaxies(Bressanetal1 994) .Intheframeworkoftheevolutionarypopulationsynthesisstudy ,SSPsaremodelledwithproperstellarevolutionarytracksofdifferentmassesandinitialchemi… 相似文献
4.
1 IntroductionTheobjects ,0 748 1 2 6and 2 2 5 1 1 5 8( 3C45 4 3) ,arequasars.Theyallhaveanopticallybrightnucleus.Thecompactnuclei,emittingstrongradioradiationatcentermeterwavelength ,aretypicalAGNs .TheradioemissionregionintheAGNsisverysmallinsizeWehavecarriedoutsnapshot… 相似文献
5.
1 Purposesoffollow upspectroscopyThepurposesofourfollow upspectroscopyofsupernovaeareasfollows ;● Identificationofthetypeandphase (datesbefore/aftermaximum)ofnewlydiscoveredsupernovaatanearlystage .Identificationoftypeandphaseshouldbedoneasearlyaspossible.… 相似文献
6.
1 IntroductionThemetallicitydeterminationisoneofthemostessentialworksinastronomy .ToinvestigatetheformationhistoryofourGalaxy ,theinformationaboutpositions,spatialmotions,andagesofcomponentstarsareindispensable .TheHipparcosmissiongaveuseahugedatabaseabo… 相似文献
7.
1 IntroductionUltraluminousfar infrared (UFIR) galaxiesareoneoftheimportantdiscoveriesmadebyI RAS .Theluminositiesofthesegalaxies,>1 0 12 L⊙ ,are 2to 3ordersofmagnitudehigherthanthoseofmostofspiralgalaxies,totheluminositydomainofquasars .Thesourceofenergyforsuchg… 相似文献
8.
1 IntroductionsThediscoveryofmeterwave (~ 1 0 - 30 0MHz)spikebursts (fastdriftingburstswithveryshortdurationsatfixedfrequencies)canbetracedbacktothe 1 96 0’sbyDeGrootandtheirchar acteristicsofnarrow band (therelativewavebandislessthanafewpercent)andveryshortemis si… 相似文献
9.
1 IntroductionLightwaves ,departedfromdistantstars,keepaperfectwavefrontuntiltheyarereachingtheearthatmosphere.Atmosphericturbulenceinducesspatialandtemporalvariationsintheairrefractiveindexandresultsinrandom phasedelaysinthepropagatingwavefront.Atmosph… 相似文献
10.
1 IntroductionInthemorethan 5 0yearsfromthatthesolarradioastronomywasborn ,peoplehavecarriedoutagreatdealofobservationsandstudiesonradioemissionphenomena ,butitwasdonefewinradioabsorptionphenomena .Infactinthesolaratmosphericplasma ,theradiationandabsorpti… 相似文献
11.
1 IntroductionTTauristarsandtheirsurroundingcircumstellardisksgrowbyaccretionofmattercausedbydynamicalinfalloftheprotostellarenvelopes .Recently ,severalobservationsofprotostellaren velopeswithmillimeterarraysweremade ,providingstrongevidenceforinfallint… 相似文献
12.
1 IntroductionArarelargeTypeⅣmicrowaveburstwasobservedatYunnanobservatorywithPhoenixⅡMicrowaveSpectrometeratthreefrequencies ( 1 42 ,2 84and 4 0 0GHz)from 0 8h31 mto 0 9h41 mUTonDecember 1 6 ,1 988.ThisrarelargeTypeⅣμburstappearedovertheactiveregionNOAA/USAF 5 2 78,comingfroma… 相似文献
13.
1 TheKuiperBeltObjectsThesolarsystemisbelievedtocondenseoutofaninterstellarcloudofgasanddust,inwhichthehot ,centralpartcontractedtoformwhatlaterbecametheSun ,whereasinasurroundingro tatingdisk -likestructure ,solidgrainparticlescontinuedtogrow ,andeventual… 相似文献
14.
1 IntroductionThesolaractivecycleisusuallydescribedwiththerelativesunspotnumbers.Analysesofhis toricaldataontherelativesunspotnumbershaverevealedawealthofinformationaboutthesolaractivecycle (HongQinfang 1 990 ,1 994;ZhongShuhua 1 991 ,1 995 ) .Theso called 1 1 yearpe rio… 相似文献
15.
1 IntroductionAsaresultofmanyyears’efforts,Chineseastronomicalcommunityhaslaiddownasolidas tronomicalobservationalfoundation ,whichisfiguredbythe 2 .1 6mand 1 .5 6mopticaltelescopes,the 1 .2minfraredtelescope ,thesolarmagneticfieldandmulti channeltelescope ,the 1 3.7m… 相似文献
16.
1 IntroductionCKBoowasdiscoveredandconfirmedtobeacontactbinarybyBond ( 1 975 ) .Afteritsdis coverythesystemisobservedfrequently (e .g .Aslan ,1 978;AslanandDerman ,1 986 :PajdoszandZola ,1 987;Krzesinskietal.,1 991andJiaetal.,1 992 ) .Asreportedbyseveralauthors,thelightcurveofthesy… 相似文献
17.
1 IntroductionWeplantodevelopthedualchannelreceiver,whichisusedtomakethesimultaneousobser vationat 1 0 0GHzand 1 5 0GHzbands.TheSISmixersareusedfortwobands.Toconstructthedualchannelreceiversystem ,thequasiopticalsystemhastobeconsideredfirstofall.Thebeamfromthe… 相似文献
18.
1 Introduction SincetheIRASdetection ,severalfollow -upsurveysandcrossidentificationshavebeenmadeaccordingtodifferentcriteria.Atypicalsamplingmethodintheprevioussurveysisflux -limited (e.g .,Snell,Dickman ,&Huang 1 988;McCutcheonetal.1 991 ) .Snell,Dickman ,&Huang ( 1 98… 相似文献
19.
1 IntroductionTworeceiversystemhavebeenusedatTRAO (TaedukRadioAstronomyObservatory) .OneisSIS (SuperconductorInsulatorSuperconductor)receiverof 1 0 0GHzbandwiththefre quencyrangesof 85 1 1 5GHz〔1〕.TheotherisSchottkyreceiverof 1 5 0GHzbandwiththefre quencyrangesof 1 2 5 … 相似文献
20.
1 IntroductionofSpaceSolarTelescopeTheSSTsatellitewillbelaunchedin 2 0 0 3to 2 0 0 5 .ThemainfeaturesofthespacecraftareshowninTable 1andtheequipmentofSSTinTable 2 .ThemainscientificobjectivesofSSTcanbesummarizedas,1 >studyoftheenergybuildup ,storage ,andreleaseproce… 相似文献
|