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1.
Anumberoflanthanideternarycomplexescon tainingheterocyclicamineshavebeenreportedsince1960 [1] .Inrecentyearsmuchattentionhasbeenpaidtoquaternarycomplexesoflanthanidesbecauseofin terestingstructure ,coordinationmode ,competitionre actionandproperty[2~ 9] .ESRcane…  相似文献   

2.
Effect of Cerium on Chemical Short Range Order of Al-Fe-Ce Amorphous Alloy   总被引:1,自引:0,他引:1  
Inrecentyears,Heetal.[1]andInoueetal.[2]discoveredagroupofamorphousalloyswithaluminumcontentcloseto90%(atomfraction),whichpossessexcellentspecificstrengthinAlTMRE(TM=transitionmetal)systems.Theyhaveupto500~1100MPainstrengthandgoodductility.However,theoriginofAlbas…  相似文献   

3.
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   

4.
Recently ,manymaterialresearchershavecometorealizethattheelectroniccharacterhasadecisionalroleonmaterialpropertiesandmicrostructure[1~ 3] .Theseworksrevealanewmechanismtomaterialbehaviorandanewun derstandingelectrontheoryofalloy .Addition aly,theeffectofane…  相似文献   

5.
Aluminumnitride (AlN) ,duetogoodphysicalandmechanicalproperties ,issuitableformultilayerlayoutandisconsideredasapromisingmaterialforsubstrate ,electronicpackingandlarge scaleintegratedcircuit[1~ 4] .Inaddition ,itiswidelyusedintheoptoelec tronicfield ,suchasMOD…  相似文献   

6.
Perovskite typeoxides (generalformulaABO3 )havebeenattractingmuchattentionformorethantwodecadesduetotheirpotentialcommercialapplicationsascatalystsforvariousreactions :oxidationofCO[1~ 3 ] andlighthy drocarbons[4~ 7] ,combustionofnaturalgasorCH4 [8~ 1 1 ] (tocontrolN…  相似文献   

7.
Nickel metalhydride (Ni MH )batteryhasbeenusedinmobileelectricfacilitiessinceitscommercialization .RecentlyNi MHbatteryhasalsobeendevelopedandusedintheareaofelectricvehicles[1~ 3 ] .AlargeamountofvaluablerawmaterialsareneededinmakingNi MHbatteries .Providedtha…  相似文献   

8.
Adsorption of Er( Ⅲ ) and Its Mechanism on Diglycolamidic Acid Resin   总被引:15,自引:0,他引:15  
Thesynthesischaracterizationandadsorp tionpropertyofpolymericmaterialshavebeenpublishedinrecentyears[1~ 9] .DiglycolamidicacidresinDAARisanovelpolymericmaterialwhichcontainsafunctionalgroup [-N(CH2 COOH ) 2 ].Itpossessesnotonlyprotonthatcanexchangewithcation ,b…  相似文献   

9.
Theanticoagulationfactor (ACF)fromthevenomofAgkistrodonacutusinSouthernAnhui,China ,possessesmarkedanticoagulantactivity[1] .The1H 1 DNMRand1H 2 Dshift edcorrelated (COSY 90 )spectraofACFhavebeendetermined ,andtheαHandβHoftheAlasidechaininACFhavebeenassigned[2 ] .Th…  相似文献   

10.
since 1 960s ,theresearchoftheZieglercatalystapplyingtothepolymerizationofacry latehasbeenincreasing[1~ 3] ,forexamplethepolymerizationofacrylatewithzirconiumorrareearthcatalystshasbeenpublished[4~ 6 ] .However ,thepolymerizationmechanismoftheacrylatewiththetrans…  相似文献   

11.
Anelectrorheologicalfluidisasuspensionofpolarizablesolidparticlesdispersedinanon conductingliquid ,exhibitingdrasticandreversiblechangeinrheologicalpropertieswhenanexternalelectricfieldisapplied[1] viaorderingofthemicrostructureintoparticulatecolumns.Thi…  相似文献   

12.
Vanadiumoxidehasbeenwidelystudiedintherecentyearsbecauseofitsimportanceinmanyareasofchemistry .Intheareaofcataly sis ,vanadiumoxidehasbeenusedasacata lystforselectiveoxidation ,oxidativedehydro genation ,andammoxidationreaction[1~ 4] .Intheoxidationreactionon…  相似文献   

13.
Recently ,therehasbeenconsiderablein terestinlanthanidehexacyanoferratesandtheanalogouscobaltaswellaschromiumcomplex esbecauseoftheirpotentialascatalytic ,semi conductive ,andmagneticmaterials[1~ 9] .And ,someofthesecyanidesaresemiperme ablemembraneswhicharev…  相似文献   

14.
Aswellknown ,theadditionofcarboncanpre ventthephosphorus inducedintergranularfailureiniron .ButitistheresultofusingAES (Augerelec tronspectroscopy)analysisinfracturedsurfaceanal ysis .ErhartHetal[1] ,inordertoexplainthemech anismofcarbonsuppressingtheintergra…  相似文献   

15.
SinceKidoetal.havefirstreportedonorganicelectroluminescence (EL)usingrareearth (RE)complexastheemittinglayer[1] ,muchworkhasbeenfocusedonthisfieldduetoitshighcolorpurity[2~ 4] .However,thekeyproblemwithrareearthβ diketonecomplexesistheirpoorthermalstabilityand…  相似文献   

16.
Therearealotsofreportsaboutthepoly merizationofacrylonitrile (AN) [1~ 3] .Intheradicalpolymerization ,usuallyitisinitiatedbybenzoperoxide ,K2 S2 O4 Na2 S2 O3,Fe2 + H2 O2 andsomeorganiccompounds .There portsonorganolanthanidesassingle componentcatalystswasrarelyinlitera…  相似文献   

17.
Thechemicalheatingasakindofheatingmethodforladlerefiningispaidmoreandmoreat tention ,suchasinRH KTB ,CAS OB ( PI) ,RH OB[1- 4] etc .Amongthem ,theCAS OBprocessde velopedrapidlyduetoitsabilityofrapidlyraisingtemperatureandaccuratelyadjustingsteelcomposi tion .Butthe…  相似文献   

18.
Rareearthcomplexeswithsulfoxideandaromaticcarboxylacidhavebeenwidelystud ied[1~ 3 ] .Itisprovedthattheybothhavebet terfluorescencecharacter .Howeverthearo maticcarboxylofrareearthcomplexeshaveveryhighfluorescenceemissionintensityandstability ,butsolubilityi…  相似文献   

19.
Modification Effects of Lanthanum-Rich Mischmetal on A357 Alloy   总被引:1,自引:0,他引:1  
astAl Si Mgalloysarewidelyusedinaeronautical spaceindustryandautomobilein dustrybecauseoftheirsuperiorcastingpro cessingcapability ,fatigueandcorrosionresis tance ,moderatespecificstrengthanddesirablecombinationofmechanicalproperties[1] .A35 7alloyinUSAspecif…  相似文献   

20.
Asonepracticalapplicationofsurfacemodificationbasedonlasertechnique ,RE laseralloyinghasbeenwidelyinvestigatedandreported[1] .Althoughthetreatmentofsurfacegas phaseREpermeationhasbeenprovedtobeeffectiveonimprovingsurfacehardness ,abrasiveresistanceandcorr…  相似文献   

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