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贺国强 《上海大学学报(英文版)》2000,4(2)
1 Introduction LetX ,YbetwoHilbertspacesandletAbeaboundedlinearoperator,i.e .,A∈B(X ,Y) .Consid ertheoperatorequationAx=y . (1)IfR(A) ,therangeofA ,isnonclosedinY ,Eq .(1)isill posed[1] .Manyimportantproblemsinappliedsci encesresultinthiskindofequations[2 ,3] .Inthispaperwec… 相似文献
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1 Introduction LetX ,YbetwoHilbertspacesandletA∈B(X ,Y) ,i .e .,aboundedlinearoperator .ConsidertheoperatorequationAx =y (1.1)IfR(A) ,i .e .,therangeofA ,isnon closedinY ,Eq .(1.1)isill posed[1] .Manyimportantproblemsinappliedsciences ,especiallyinverseproblems ,resultinthiski… 相似文献
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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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《高等教育研究学报》2000,(1)
排名期刊名称总引用次数1997年排名1生物化学杂志322,5291JournalofBiologicalChemistry2美国国家科学院自然科学进展290,1212Proc.Natl.Acad.Sci.USA3自然288,0263Nature4科学250,3274Science5美国化学会志179,0365J.AmericanChemicalSociety6细胞159,6856Cell7物理评论快讯146,5737PhysicalReviewLetters8物理评论B134,4768PhysicalReviewB9新英格兰医学杂志129,9289NewEnglandJournalo… 相似文献
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1 Introduction BeginningwiththepioneeringworkofHoareandothers,therehasbeenapushtomakesoftwareproduc tionanengineeringsubject.Byintroducingtechniquesbasedfirmlyinmathematicsclaimtheyledtoimprove mentsinqualityand ,ultimately ,productivity .Aspeci ficationp… 相似文献
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Shi Fei Zheng Fangjing 《上海大学学报(英文版)》1998,2(4):295-300
y Control Based on Genetic Algorithm and Its ApplicationsTX1IntroductionMembershipfunctionisthebasisforfuzzylogictheorytoappli... 相似文献
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StressAnalysisoftheGlassBulbof35-inch(V)120°ColorPictureTubeTorongeyPeterKimanus(MoiUniversity,DepartmentofPhysics,P.O.Box390... 相似文献
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请看下面几道高考题 :1 .CarolsaidtheworkwouldbedonebyOctober,personallyIdoubtverymuch .(NMET’99)A .it B .that C .when D .which2 .ismentionedabove ,thenumberofthestudentsinseniorhighschoolisincreas ing .(NMET’99上海 )A .Which B .As C .That D .It3.Dorothywasalwaysspeakinghighlyofherro… 相似文献
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1 Introduction Singularlyperturbeddifferentialequationswithturningpointsareveryimportantformathematiciansandphysicistssincetheseproblemsexistwidelyinmanyproblemsofphysics.TheproblemswithturningpointswerestudiedbyWentzal,Kramers,Bullounin[1],Langer,A… 相似文献
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第Ⅰ卷 (共 6 5分 )一、听力理解 (共 2 0分 ,每小题 1分 )A)在下列每小题内 ,你将听到一个句子并看到供选择的三个句子。找出与你所听到的那个在意思上最接近的选项( ) 1.A .Thereisalittlewaterleft.B .Thereissomewaterleft.C .Thereislittlewaterleft.( ) 2 .A .MissZhaothinksshe’sagoodteacher .B .PeoplethinkthatMissZhaoisagoodteacher.C .WeallthinkMissZ… 相似文献
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Matteo Pastorino 《上海大学学报(英文版)》1998,2(1):1-14
RecentAdvancesinShort┐RangeMicrowaveImaginginEuropeMateoPastorino(DepartmentofBiophysicalandElectronicEngineering,Universityo... 相似文献
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从阿弥陀来迎图看西夏的往生信仰张元林AStudyoftheRebirthBeliefoftheWesternXiaPeriodontheBasisofthePaintingsofAmitabha'sDescendingZhangYuanlinTheC... 相似文献
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本文先给出三角形的外接圆半径、内切圆半径与面积之间的一个不等式 .定理 1 若三角形的外接圆半径为R ,内切圆半径为r,面积为S ,则Rr≥2 39S .证 设△ABC的三边长为a、b、c,由S =abc4R ,得 1ab 1bc 1ca=c4RS a4RS b4RS=a b c4RS =a b c4R·12 (a b c)r=12Rr,即 1ab 1bc 1ca=12Rr. ( 1)∵ S =12 absinC =12 bcsinA =12 casinB ,∴ 1ab 1bc 1ca=sinC2S sinA2S sinB2S =sinA sinB sinC2S .又易证 si… 相似文献
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关于三角形内角的两个关系式及其应用曾思江(湖南省新化三中417600)△ABC中,设三内角A、B、C所对边分别为a、b、c,由正弦定理有a=2RsinA,b=2RsinB,c=2RsinC,以此代入a+b>c中,得2RsinA+2RsinB>2Rsi... 相似文献
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ThevarietyofEnglishspokenintheUSAiscalledAmericanEnglish .AmericanEnglishgrewoutofBritishEnglishofthe 17thcentury.WiththefurthergrowthoftheUnitedStates,AmericanEnglishhasevolvedfroma“colonialbranch”toavariantorna tionalstandardofEnglish .Thecharacteristic… 相似文献