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THE POLYMERIZATION OF METHYL METHACRYLATE WITH A NEW TIN-BRIDGED YTTROCENE/Al(i-Bu)_3 总被引:1,自引:0,他引:1
INTRODUCTIONSincethepolymerizationofmethylmethacrylate(MMA)withrareearthcatalystswasrealizedforthefirsttimein1991,aseriesofnewrareearthcatalystsystemssuchasNd(P204)3/Al(iBu)3,Nd(P204)3/Al(iBu)3/CCl4,Nd(Oct)3/Al(iBu)3,Ln(acac)3/BuMgCl,Y(acac)3/Al(iBu)3/BuLi,Nd(naph)3/BuLi,andNd(O… 相似文献
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浅议计算机辅助教学 总被引:1,自引:0,他引:1
孔文 《山东教育学院学报》2002,17(6):86-88
ComputerAssistedlnstruction (CAI)isthetermusedtodescribecomputerprogramsdesignedforteaching .ItisimportantnottoconfusethistermwithCALL(ComputerAssistedLanguageLearning)———thecatchalltermfordiffer entformsofL2instructionaccomplishedwiththeuseofcomputers.Fo… 相似文献
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INTRODUCTIONMetallocenesincombinationwithmethylalu moxaneorperfluorinatedboratesascocatalystformextremelyactivecatalystsforthepolymer izationofolefins ,cycloolefins,styrene ,andbutadienearenowusedinindustrialprocesses(Scheirsetal.,2 0 0 0 ;Kaminskyetal.,1 997b ;Bo… 相似文献
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LOCALINFLUENCEANALYSISBASEDONTHEK-LDISTANCEANDTHEINFORMATIONDISTANCEHuYueqing(胡跃清)(DepartmentofMathematicsandmechanics)LOCALI... 相似文献
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ISTHENOVELDEAD ?Therehasbeennolackofpropheciesofthedeathofthenovelsincethebeginningofthe2 0thcentury .Manyprestigiouscritics,suchasT .S .Eliot,OrtegaY .Gasset,AlbertoMoraviaandCyrilConnolly ,haverelentlesslypronounceddeathsentenceonthenovel.Althoughthousandso… 相似文献
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1 Introduction Thealloyingofhighmolybdenumandhighnitrogenisthefundamentalofdevelopingmodernhighly alloyedausteniticstainlesssteels,itsoptimumresistancetopit tingandstresscorrosioniscommonlyacknowl edged[1 ,2 ].Inthissystem ,0 0Cr2 0Ni18Mo6Cu[N]and0 0Cr2 0Ni18Mo5Cu [N ]… 相似文献
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InAugust 2 0 0 2 ,theHumanResourceDevelop mentTrainingTeamfromtheEU ChinaProgrammefortheDevelopmentofVocationalTrainingforIn dustryvisitedHubeiXiangfanVocationalandTechni calCollege.DuringtheDetailedTrainingNeedsAnalysisac tivitiestheHRDTeamvisitedXiangfanVo… 相似文献
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Hua Bin Shi Liyi 《上海大学学报(英文版)》1999,(2)
NomenclatureCAOconcentrationofsourcevapor,mol/m3DA(A=FCW,NCW,FCW)dimensionlessratesoffilmcoating,nucleationcoatingandtotalco... 相似文献
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BAYESIANMETHODOFMACROECONOMICALDECISIONChenPing(陈平)(DepartmentofMathematicsandMechanics)BAYESIANMETHODOFMACROECONOMICALDECISI... 相似文献
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INTRODUCTIONAntisenseoligodeoxynucleotides (ASODN )caninhibittranscriptionandinterferewithspe cialgeneexpression .AfixedpointontheK rasgenewithhighmutationrateinpancreaticcarci nomaoffersanintracellulartargetforpancreaticcarcinomagenetherapywithASODN (Cai… 相似文献
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一、选择题 (本大题共 12小题 ,每小题 5分 ,共60分 .在每小题给出的四个选项中 ,只有一项是符合题目要求的 )1 已知集合M ={x| -1≤x≤ 1},N ={y|-1≤y≤ 1},则在下列图中 ,不是从集合M到集合N的映射的是 ( )2 设复数z =i(1_ 3i) ,那么argz等于( ) (A) 2π3 (B) 5π6 (C) 4π3 (D) π63 已知α是第三象限角 ,则下列等式中可能成立的是 ( ) (A)sinα +cosα=1.2 (B)sinα+cosα =-0 .9 (C)sinαcosα =3 (D)sinα+cosα =-1.24 已知正n棱台 (n∈N ,… 相似文献
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INFLUENCEMEASUREOFPERTURBATIONANDVARIABLESINREGRESSIONMODELSHuYueqirig(胡跃清)(DepartmentofMathematicsandMechanics)INFLUENCEMEAS... 相似文献
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ANOTEONPANCYCLICORIENTEDGRAPHSongZengmin(宋增民)ChenLiming(陈黎明)(DepartmentofMathematicsandMechanics)ANOTEONPANCYCLICORIENTEDGRAP... 相似文献
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从一个例子谈起 已知△ABC的三个内角A、B、C满足 :A C =2B ,secA secC =- 2secB ,求cos A -C2 的值 .解 由A C =2B ,得A C =12 0° ,B =6 0° .∵ secA secC =- 2secB ,∴ cosA cosC =- 2 2cosAcosC ,2cos A C2 cos A -C2=- 2〔2cos2 A -C2 - 1 cos(A C)〕 ,即 4 2cos2 A -C2 2cos A -C2 - 32 =0 .因 - 324 <- 1,故解得cos A -C2 =22 .1 关于解题思维表现的分析上例中 ,条件是三角形三内角的一个关系式和有关这些角的一… 相似文献
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INTRODUCTIONAnAdeno associatedvirus(AAV)particleiscomposedofthreestructuralproteinsandalin ear ,single strandedDNA (ssDNA)genomeofapproximately 4 .7kb .AAVisadefectivehu manparvovirusthatnormallyreplicatesproduc tivelyonlyinthepresenceofhelperfunctionsprovide… 相似文献
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1 擂题 4 5的评注 擂题 (4 5 ) (李建潮提供 ) 注 :本刊 2 0 0 0年第 5期将本擂题作者姓名误为李建明 ,特此更正 )证明或否定 :在△ABC中 ,有cosnA cosnB cosnC≥sinn A2 sinn B2 sinn C2(n∈N ,n >1 )①本擂题奖金获得者是吴善和 (福建省资源工业学校 ,3 64 0 1 2 )。现刊登吴善和先生的来稿 ,作为本擂题的解答。证明 : 根据待证不等式①关于A、B、C的对称性 ,不妨设A≥B≥C ,则π/3≤A <π ,0 <C≤π/3。不等式①等价于cosnA cosnB -2sinn C2 cosnC sin… 相似文献
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《上海大学学报(英文版)》2002,(4)
·Reviews·PhysicalandMathematicalModelingoftheArgon OxygenDecarburizationRefiningProcessofStainlessSteelWEIJi He (1 )………………………………………………………………………………………………………·Letters·SteganographicTechniqueCapableofWithstandingRQPAnalysisWANGShuo Zhong ZHANGXin Peng ZHANG… 相似文献
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CALCULATIONOFTHEHARMONICLEAKAGEOFIRREGULARWINDINGSHuQiansheng(胡虔生)LiuHui(刘徽)(DepartmentofElectricalEngineering)CALCULATIONOFT... 相似文献