简介:LocatedinthenorthernpartofTibet,NagchuPre-fecturecoversanareaof0.42millionsquarekm.AsaState-classnaturereserve,itisamajorhabitatofvari-ouswildlife,suchasantelopes,argalis,black-neckedcranesandwildyaks,whicharelistedbytheStateasanimalssubjecttofirst-classprotection.Inrecentyears,theForestryBureauofNagchuareabuiltmanynaturereservesofdifferentlevelsandadoptedeffectivemeasuresfortheprotectionofwildanimals.Asaresult,somespeciesofendangeredwild
简介:Allimagescourtesyoftheartists■LorettaYangHui-shan(杨惠姗)andChangYi(张毅)areinseparable.Theyhavedoneeverythingtogether,includinggivingupstardom20yearsagotopursueacareerincontemporaryglassart.WithtwoGoldenHorseawardsandaprizefromtheAsia-Pacific
简介:FollowingtheexcavationoftheNos.2and3ruinsoftheGuigongPalace桂宫in1997,theSino-JapaneseJointArchaeologicalTeamofIA,CASSandNaraNationalCulturalPropertiesInstitutecontinuedexcavatingtheNo.4buildingruinsfromtheautumnof2000tospringof2001.ItliesatLiucunbu六村堡VillageofLiucunbuTownshipinWeiyang未央District,Xi'an西安City,25mnortheastofTiesuoVillage铁锁村,182meastofthewesternpalace-walland215msouthofthenorthernpalace-walloftheGuigongPalace,HanChang'an长安City.TheHanperiodruinsabovethegroundsurfaceweredamaged,onlytheHanfloorandbeneathitremain.
简介:Yun-changWang,aChinesemycologistandpathologist,wasborninNeihuangcountyofHenanprovince.AfterhisgraduationfromAgriculturalCollegeofPeipingUniversity,hebecameanassis-tantresearcherinBotanyInstituteofPeipingInsti-tute.In1936,hestartedhisstudyinBelgiumandtwoyearslaterwasgrantedadoctorateby1'UniversitédeLouvain.Since1939,hehassucces-sivelytaughtinZhejiangUniversity,SichuanUni-versity,NorthwestAgriculturalCollege,Northwest
简介:Anovelautomaticseamlessstitchingmethodispresented.Comparedtothetraditionalmethod,itcanspeedtheprocessingandminimizetheutilizationofhumanresourcestoproducegloballunarmap.Meanwhile,anewglobalimagemapoftheMoonwithspatialresolutionof~120mhasbeencompletedbytheproposedmethodfromChang’E-1CCDimagedata.
简介:<正>ChangDai-chien[ZhangDaqian](1899-1983)wasanativeofNei-chiang,whereSzechwanprovinceofChina.HisoriginalgivennameChuanwaslaterchangedtoYuan,whilehischildhoodnameChiwaslaterincorporatedintohisstudionameChi-yuan.HetookthereligiousnameDai-chienuponbecomingaBuddhistmonk,andafterreturningtothelaityhecalledhimselfDai-chienchu-shihor"LaybelieverDai-chien."
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简介:Amapoftheaverageatomicnumberoflunarrockandsoilcanbeusedtodifferentiatelithologyandsoiltypeonthelunarsurface.Thispaperestablishesalinearrelationshipbetweentheaverageatomicnumberoflunarrockorsoilandthefluxofpositionannihilationradiation(0.512-MeVgamma-ray)fromthelunarsurface.TherelationshipisconfirmedbyMonteCarlosimulationwithdatafromlunarrockorsoilsamplescollectedbyLuna(Russia)andApollo(USA)missions.AmapoftheaverageatomicnumberofthelunarrockandsoilonthelunarsurfacehasbeenderivedfromtheGamma-RaySpectrometerdatacollectedbyChang’e-1,anunmannedChineselunar-orbitingspacecraft.Inthemap,thehigheraverageatomicnumbers(ZA>12.5),whicharerelatedtodifferenttypesofbasalt,areinthemariaregion;thehighestZA(13.2)readingsareassociatedwithSinusAestuum.ThemiddleZA(~12.1)regions,intheshapeofirregularovalrings,areinWestOceanusProcellarumandMareFrigoris,whichseemstobeconsistentwiththedistributionofpotassium,rareearthelements,andphosphorusasauniquefeatureonthelunarsurface.Theloweraverageatomicnumbers(ZA<11.5)arefoundtobecorrelatedwiththeanorthositeonthefarsideoftheMoon.
简介:1.Introdution:Thestudiedoredepositislocatedinthebeltofpolymetallicoredepositsinthemiddle-lowcourseoftheYangtzeRiver,andTanchcng-LujiangandXiaotian-Mozhitandeepfracturezoneslieinthewestadsouthpartoftheoredepositrcspectivcly.Lujiang-Zhongyangvolcanicbasin(theMesozoicEra)liesineast,andtheoredistrictisa
简介:DrivenbycuriosityaboutpossibleflightoptionsfortheChang’e-2spacecraftafteritremainsattheSun-EarthL2point,effectiveapproachesweredevelopedfordesigningpreliminaryfuel-optimalnear-Earthasteroidflybytrajectories.Theapproachesincludetheuseofmodifiedunstablemanifolds,gridsearchofthemanifolds’parameters,andatwo-impulsemaneuverfororbitalphasematchingandz-axisbiaschange,andaredemonstratedtobeeffectiveinasteroidtargetscreeningandtrajectoryoptimization.Asteroidflybysareexpectedtobewithinadistanceof2×107kmfromtheEarthowingtotheconstrainedEarth-spacecraftcommunicationrange.Inthiscase,thespacecraft’sorbitalmotionissignificantlyaffectedbythegravitiesofboththeSunandtheEarth,andtherefore,theconceptofthe"heliocentricoscillating-Keplerorbit"isproposed,becausetheclassicalorbitalelementsoftheflybytrajectoriesreferencedintheheliocentricinertialframeoscillatesignificantlywithrespecttotime.Theanalysisandresultspresentedinthisstudyshowthat,amongtheasteroidswhoseorbitsarethemostaccuratelypredicted,"Toutatis","2005NZ6",or"2010CL19"mightbeencounteredbyChang’e-2inlate2012or2013withtotalimpulseslessthan100m/s.