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500 个结果
  • 简介:TheNb-bromomethylderivative(2)ofgelsemine,aquaternaryammoniumsalt,wasfoundtoberecalcitranttowardHofmanntypealkalinedegradationwhichhasbeensuccessfulinothercases.Instead,are-distributionoftheN-methylgrouptookplace,givingriseto3a,1,3band3c,indescendingorderofRfvalues.

  • 标签: DESCENDING hasbeen GIVING ALKALINE derivative toward
  • 简介:WestudythestructureofBernstein’sfirstsummableoperatorsandshowthattheycon-vergeuniformlytocontinuonsfunctionsonthespecialrealorthogonalgroupSO(n)inthispaper.Inaddition,wehavealsodiscussedtheapproximationdegreetoaclassoffunctionLipα(0<α≤1)onSO(n).

  • 标签: OPERATORS verge FIRST REAL UNIFORMLY kernel
  • 简介:TwospeciesofN-arylpyrazolescontainingactiveaminogroupweresynthesized.AndformylationsofN-arylpyazolescontainingaminoindifferentpositionofpyrazoleringsusingVilsmeier-Haackreactiongaveaseriesofusefulpyrazoleintermediates.Theimportantfeaturesofthisprotocolwerecheapmaterials,easyprocess,mildreactionconditionsandgoodyieldofproducts.

  • 标签: Vilsmeier-Haack反应 N-芳基吡唑 甲酰化 氨基 合成
  • 简介:Assumethateachcompletelyirrationalnoncommutativetorusisrealizedasaninductivelimitofcirclealgebras,andthatforacompletelyirrationalnoncommutativetorusAwofrankmthereareacompletelyirrationalnoncommutativetorusAρofrankmandapositiveintegerdsuchthattr(Aw)=1/d.tr(Aρ).ItisprovedthatthesetofallC^*-algebrasofsectionsoflocallytrivialC^*-algebrabundlesoverS^2withfibresAωhasagroupsturcture,denotedbyπ1^s(Aut(Aω)),whichisisomorphictoZifEd>1and{0}ifd>1.LetBcdbeacd-homogeneousC^*-algebraoverS^2×T^2ofwhichnonon-trivialmatrixalgebracanbefactoredout.ThesphericalnoncommutativetorusSρ^cdisdefinedbytwistingC^*(T2×Z^m-2)inBcd×C^*(Z^m-3)byatotallyskewmultiplierρonT^2×Z^m-2。ItisshownthatSρ^cd×Mρ∞isisomorphictoC(S^2)×C^*(T^2×Z^m-2,ρ)×Mcd(C)×Mρ∞ifandonlyifthesetofprimefactorsofcdisasubsetofthesetofprimefactorsofp.

  • 标签: 基本群 自同构群 非交换环 C^ *代数 向量积
  • 简介:ThispapercontinuestheworkofD.MacHale,D.Flannery(Proc.R.Ir.Acad.81A,209—215;83A,189—196)andtheauthor(Proc.R.Ir.Acad,90A,57—62;J.SouthwestChinaNormalUniversity15,No.1,21.—28)onthetopicon“FinitegroupswithgivenAutomorphismgroup”.Thefollowingresultisproved:LetGbeafinitegroupwithAutGaSchmidtgroup.ThenGisisomorphictoS3orKlain4-group.,orDsuchthatAutD=InnD.DisaSchmidtgroupoforder2?p.S2(∈Syl2D)isanormalandspecialgroupexoeptasupersperspecialgroupwithoutcommutativegenerators.

  • 标签: ISOMORPHIC COMMUTATIVE NILPOTENT SUBGROUP exponent maximal
  • 简介:TheHuayuGroupiscomposedofonecoreenterprise,nineclosely-relatedenterprisesand16loosely-relatedenterprisesinAnhui,JiangsuandZhejiang.Itsbusinessincludesfinance,materials,knitwear,garmentsandeducation.AnhuiChuzhouHuayu(Group)Co.Ltd.—acoreenterpriseofHuayuGroup—isacomprehensiveenterprisegroup,integratingproduction,trade,scientificresearchanddevelopment.Ithasastaffof4,000,andeightfactoriesandfivecompaniesunderitsadministration.Majorproductsincludesixseriesyarn

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  • 简介:Itisprovedthatthereisnochaoticgroupactionsonanytopologicalspacewithfreearc.InthispaperthechaoticactionsofthegrouplikeG×F,whereFisafinitegroup,arestudied.Inparticular,underasuitableassumption,ifFisacyclicgroup,thenthetopologicalspacewhichadmitsachaoticactionofZ×Fmustadmitachatotichomeomorphism.Atopologicalspacewhichadmitsachaoticgroupactionbutadmitsnochaotichorneomorphismisconstructed.

  • 标签: 混沌群作用 拓扑空间 自由弧 有限群 循环群 混沌同胚
  • 简介:TheAnhuiChizhouJiedaGroupiscomposedof58units,includingAutoTransportGeneralCompany,JiedaCo.Ltd.,ComprehensiveDevelopmentGeneralCompanyandindependentlyaccountingunitsdirectlyaffiliatedtothegroup.Businessscopeinvolvesautotransportation,realestatedevelopment,garmentmaking,tourism,hotel,internalandexternaltrade,decoration,electronicdevelopment,buildingmaterials,repairandprinting,thusformingapatternwithtransport,tourism,industryandtradeasthefourpillars.Ithasnowastaffof4,000,assetsofRMB140million,

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