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1.
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   

2.
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   

3.
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   

4.
《河北自学考试》2000,(9):33-37
Ⅰ .VocabularyandStucture (1 0 points,1 pointforeach)1 .Almosteverythingamanagerdoes  deci sions;indeed ,somesuggestthatthemanagementpro cessisdecisionmaking .[A]imposes[B]improvises[C]involves[D]indi cates2 .Astronomersandscientiststhinkthatablackholeisaregionofspace…  相似文献   

5.
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   

6.
1 Introduction BeginningwiththepioneeringworkofHoareandothers,therehasbeenapushtomakesoftwareproduc tionanengineeringsubject.Byintroducingtechniquesbasedfirmlyinmathematicsclaimtheyledtoimprove mentsinqualityand ,ultimately ,productivity .Aspeci ficationp…  相似文献   

7.
y Control Based on Genetic Algorithm and Its ApplicationsTX1IntroductionMembershipfunctionisthebasisforfuzzylogictheorytoappli...  相似文献   

8.
StressAnalysisoftheGlassBulbof35-inch(V)120°ColorPictureTubeTorongeyPeterKimanus(MoiUniversity,DepartmentofPhysics,P.O.Box390...  相似文献   

9.
ResearchonGeneticAlgorithmBasedKnowledgeAuto-AcquisitionforFaultDiagnosisZhangXuejiang(张雪江)ZhuXiangyang(朱向阳)ZhongBinglin(钟秉林...  相似文献   

10.
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   

11.
1 Introduction Singularlyperturbeddifferentialequationswithturningpointsareveryimportantformathematiciansandphysicistssincetheseproblemsexistwidelyinmanyproblemsofphysics.TheproblemswithturningpointswerestudiedbyWentzal,Kramers,Bullounin[1],Langer,A…  相似文献   

12.
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   

13.
RecentAdvancesinShort┐RangeMicrowaveImaginginEuropeMateoPastorino(DepartmentofBiophysicalandElectronicEngineering,Universityo...  相似文献   

14.
熊艰 《上饶师专学报》1997,17(6):63-65,87
讨论了用VisualBasic设计CAI课件的几个技巧性方法。  相似文献   

15.
一九九四年下半年河北省高等教育自学考试阅读与写作试题Ⅰ.Findthebestchoice(15points)1.Iwanttohavetwo………………○A.scissorsB.setsofscissorsc.piecesofscissorsD.p...  相似文献   

16.
从阿弥陀来迎图看西夏的往生信仰张元林AStudyoftheRebirthBeliefoftheWesternXiaPeriodontheBasisofthePaintingsofAmitabha'sDescendingZhangYuanlinTheC...  相似文献   

17.
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   

18.
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   

19.
安西旱峡石窟李春元TheHanxiaGrottoesisAnxi¥LiChunyuanTheHanxiaGrottoesislocatedatthefootofHangorgealongthewesternsideofBiaoganmountain,...  相似文献   

20.
ThevarietyofEnglishspokenintheUSAiscalledAmericanEnglish .AmericanEnglishgrewoutofBritishEnglishofthe 17thcentury.WiththefurthergrowthoftheUnitedStates,AmericanEnglishhasevolvedfroma“colonialbranch”toavariantorna tionalstandardofEnglish .Thecharacteristic…  相似文献   

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