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1.
Displaysbasedonorganiclightemittingdevices (OLEDs)havebecomepotentialre placementsofliquid crystaldisplays (LCDs)duetotheirwideviewingangle ,higherbright ness,easeofcolortunability ,fastresponsetimeandlowdrivingvoltage[1] .Thegreenor ganicELdisplayusingtris(8 h…  相似文献   

2.
Itiswellknownthattheintergranularmi crostructureofsinteredNd Fe Bmagnetsplaysakeyroleindeterminingtheircoercivityandthermalstability[1,2 ] .Therefore ,itisimpor tanttofurthermodifyingtheintergranularmi crostructureviaalloyingorotherprocessingmethodinimprovi…  相似文献   

3.
Rareearthfluorescentcomplexesareofawiderangeofapplicationsinlasersource,display,medicineandbiologicalstudiesbecausetheyaremorestablethansmallorganiccompoundsandtheirphotoluminescence(PL)exhibitssharpfluorescenceemissionbandandhighquantumyield[1~4].…  相似文献   

4.
Since 1 970s ,REEs (rareearthelements)fertilizerhasbeenextensivelyresearchedonapplicationinagricultureandtheirphysiologi caleffects .Thereweremanyexperimentalda ta .SomeresearchersreportedthatREEscannotonlypromoteplantgrowth ,butalsoen hancethestresstolerance .…  相似文献   

5.
Rareearth (RE)micro fertilizershavebeenusedinagricultureproductioninChinasince 1 970s ,andthesemicro fertilizersaresaltsofmixedREs ,whichmainlyincludeLa ,Ce ,PrandNd[1,2 ] .PreviousstudiesshowthattheREinsurfacesoilalmostdoesnotmigratdownwardatallandthusbeaccumula…  相似文献   

6.
Effect of Cerium on Activity of α-Amylase from Porcine Pancreas   总被引:1,自引:0,他引:1  
Rareearthscanaffectchloroplastultra structure[1~ 3 ] andenzymeactivity[4~ 7] ,bywhichoflowconcentration ,biologicalfunc tionsareaccelerated ,butrestrainedathighconcentration .α Amylase ,whichbinds 4or 5calciumionsinformofdipolymer[7] ,playsanimportantroleinthecourseo…  相似文献   

7.
ExperimentshaveconfirmedthatREFe12compoundsdonotexist.ThisphasecanbestabilizedbyreplacingsomeoftheironatomsbyasmallamountofotherelementssuchasTi,V ,Cr,Mn ,Mo ,W ,Re ,AlandSi ,andREFe12 -xMxintermetalliccompoundscanbeobtained[1] .Mcannotonlystabilizethestruc tureo…  相似文献   

8.
Amonglanthanideions ,Eu3 + ionposs esesgoodluminescentcharacteristics ,highcolorpurityandhighquantumefficiency .Eu3 + isoneofthecentralionsfirstselectedforthepreparationofrareearthionsdopedlumi nescentmaterials .Dafinovaetal .[1] producedEu3 + andSO2 -4 dopedtungsta…  相似文献   

9.
ICREisaseriesinternationalrareearthconferenceorganizedbytheChineseSocietyofRareEarths(CSRE).The4thInternationalConferenceonRareEarthDevelopmentandApplications(ICRE2001)willbeheldinBeijing,China,onJune1520,2001.TheChineseSocietyofRareEarthshasthepleasuretohostIC…  相似文献   

10.
Studyonrareearthelements(REE)contentsinthemaintypesofsoilsinChinaisofsignificanceforfurtherexpoundingthechemicalbehaviorssuchasmobility,accumulationoftheREEinthesoilformingprocesses.Ontheotherhand,asREEavailabilityvarieswithsoilconditions,itisnotu…  相似文献   

11.
SinceKidoetal.havefirstreportedonorganicelectroluminescence (EL)usingrareearth (RE)complexastheemittinglayer[1] ,muchworkhasbeenfocusedonthisfieldduetoitshighcolorpurity[2~ 4] .However,thekeyproblemwithrareearthβ diketonecomplexesistheirpoorthermalstabilityand…  相似文献   

12.
Itwasproved[1] thatrareearthelements(REE)promotethegrowthanddevelopmentofplants ,andincreasetheyieldofcrops .How ever ,theirmechanismarestilllittleknown .ItwasknownthatREEincreasestheactivitiesofsomeenzymesandacceleratestheproceedingofphotosynthesisinplants …  相似文献   

13.
Thedesirableluminescencecharacteris ticsofsomelanthanideionsbasedontheintra f orbitaltransitionshavereceivedmuchatten tion.Rareearthcomplexes,especiallythosecontainingEu3 andTb3 ,oftenexhibitgoodluminescenceowingtothestrongabsorptionoftheorganicligandsand…  相似文献   

14.
Ithasbeenreportedthattherareearthel ements (REE)haveabeneficialfunctiononcropyieldandqualityaswellasstress resis tance[1] .However,mostoftheresearcheswerefocusedontheeffectsofREEcompoundoncropyieldindexes ,orlimitedattissuelev el ,whiletheresearchontheeffect…  相似文献   

15.
InrecentyearsThMn12 typeiron richcompoundshavebeenintensivelyinvestigatedduetotheirexcellentpermanent magneticproperties .AlthoughpurebinaryRE Fecom poundsdonotexist,theThMn12 structurecanbestabilizedinpseudobinariesofthetypeREFe12 -xMx,withM =Al,Ti,Cr ,Si ,Mo ,V …  相似文献   

16.
Thepoormechanicalpropertiesofcastmaterials ,especiallylowtoughness ,isamainfactorlimitingtheapplicationofprecisecastdies[1] .ThroughthemodificationofcastH1 3steelbyRE ,thedendritesegregationofCH1 3steelwasimprovedandgrainboundarycarbidewasalsoundercontrol.Acc…  相似文献   

17.
Rareearths (RE)arepowerfultracersinthestudyofevolutionofgeochemicalsystems .Theyhavebeenusedoverthepast 3 0yearsasatoolforsolvingvariousgeologicalproblems .TheapplicationofREabundancestopetroge neticproblemshascenteredsofarontheevo lutionofigneousrocks ,whe…  相似文献   

18.
Theaminoacyl tRNAsynthetases (aaRSs)playpivotalrolesinproteinbiosynthesis,whereeachofthe 2 0aaRSsisspecificforoneaminoacidanditscognateisoacceptorsoftRNA .TheinteractionofRE3 withtRNAwasstudiedbythemethodsofnuclearmagneticresonance[1 ,2 ] ,ultraviolet,fluoresce…  相似文献   

19.
ThermodynamicsandPhaseEquilibriumofCu-Ce-O,Cu-Ce-S,Cu-Ce-O-SLiquidSolutionsDUTing;LIGuoDongThermodynamicsandPhaseEquilibriumo...  相似文献   

20.
Forthelightrareearthhydridesresearch ,asamatteroffact,inmostpublicationsthesolidsolutionoftherareearthdi andtrihy dridesweretreatedasacompletelyhomoge neous .EvidencesindicatingtheexistenceofdifferentphasesintheLaH2 LaH3 systemcamefromX raystudiesandneutro…  相似文献   

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