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1.
Physicalpropertiesofacrystalarerelatedtoitsconstituentchemicalbonds,whichshowtheinteractionofalconstituentatoms.Chemicalbond...  相似文献   

2.
高中英语作业中常见病句分析铁一局兰州铁中赵和忱兰州回中崔耕1.Theirclassconsistof45students.(误)Theirclassconsistsof45students.(正)他们班由45个学生组成。class是集合名词,本句中可...  相似文献   

3.
1 Introduction  Considerthemodelx ¨+x(1-x)(x-a)=0,(1)whereaisaconstant.Asa=-1,Eq.(1)reducestotheDuffingequationforthesystemofsoftspringwithoutdampingx ¨+x-x3=0.(2) TheDuffingsystemhasbroadengineeringbackground.Therearepapers[1~4]relatedtothedynamic…  相似文献   

4.
1 Introduction Stochasticglobaloptimizationalgorithmisconcernedwithusingrandomlygeneratedpointstoapproximateoptimalsolutionofmathematicalprogramming(seeRefs.1~3forasurveyofthefield).Forsomestochasticglobaloptimizationalgorithms,thenextpointsintheseq…  相似文献   

5.
Buckling and multiple equilibrium states of viscoelastic rectangular plates   总被引:1,自引:0,他引:1  
1 Introduction Thedevelopmentofscienceandtechnologypromotestheapplicationsofviscoelasticstructures.Sinceanintegraltypeconstitutiverelationcanbeusedtosimulatethemechanicsbehaviorofaviscoelasticmaterialbetter,itiswidelyapplied.However,ifweapplyaninte…  相似文献   

6.
1 Introduction Toachieveourtargetinthecomingfifteenyears,itisessentialandimprotantinallrespectstotransformoureconomicgrwothmodeandimproveoureconomicqualityandbenefitconscientiously.Tomakefullunderstandingaboutthetransformingcanhelpustomaintainahigh…  相似文献   

7.
1 Introduction H.P.Yuenintroducedtheconceptoftwophotoncoherentstatein1976[1].Sincethattime,thesqueezedstateshavebeenoneofthemainsubjectsinquantumoptics.Usualsqueezingreferstothesecondordersqueezing.C.K.HongandL.Mandelgeneratedthesqueezingtohighe…  相似文献   

8.
1 Introduction Theproblemonthestabilityofinviscidincompressibleswirlingflowhasbeenstudiedbymanyauthors.Rayleigh[1]investigatedtheflowwithconstantaxialvelocity,i.e.U′=dUdr=0andfirstgotasufficientandnecessaryconditionofstabilityforaxisymmetricdistur…  相似文献   

9.
1 Introduction ThemagneticmaterialsbeingusedinthetreatmentofdiseasesareoneofthosefastestgrowingmeasuresinmedicalscienceinChina.Thepursuingfortherapeuticalmechanismsofmagneticmaterialsisalsoanareaoftraditionalchinesemedicine.Itisnowconsideredtolessen…  相似文献   

10.
CONSTRUCTION COST INTEGRATED CONTROL BASED ON COMPUTER SIMULATION   总被引:1,自引:0,他引:1  
INTRODUCTIONConstructioncostcontrolisimportantactivityforefficientmanagementofaconstructionproject.Acostcontrolsystemmustbedesignedtocontrolwelltheconstruction (WangShou qing,1 996) .Thissystemshouldbeprovidedwiththefunctiontolettheprojectmanagerknowthecur…  相似文献   

11.
1 Introduction Inimagecompressioncodingschemes,variousimagecodingtechniquessuchastransformcodinghavebeendeveloped.Whilethesetechniqueshaveledtorelativelyhighqualityreconstructedimagesatbitratesaround1.0b/pixelormore,theysometimesproducespecifictypeof…  相似文献   

12.
1 Introduction Tindioxidefilmshavebeenwidelyusedasconductiveelectrodes,transparentcoatings,andheterojunctionsolarcells.SnO2filmswithdifferentstructurescanbeconstructedbychemicalvapordepositiononsubstratesofdifferenttemperatures.AboafandMarcotte[1]pr…  相似文献   

13.
Motivatedbyredesigningafuselageinengineeringapplication,thenumericalandexperimentalinvestigationoftheseparatedflowfieldaroundaspecialbluntbodyisdescribedinthisthesis.Theaerodynamicresponseofthebluntbodyissuccessivelystudied.Thethesisconsistsoffour…  相似文献   

14.
INTRODUCTIONThereisgrowingconcernforcorrosiondam ageinreinforcedconcrete (RC)structureswithseveraldecades’service.Thereinforcementcor rosionofRCconstructionsprobablyisthemostsignificantproblemandoutweighsotherformsofdeterioration .StudiesbyPeattieetal.( 1 9…  相似文献   

15.
1 Introduction Facingtheintensivecompetition,managersordirectorsofenterprisesaremuchconcernedwiththeiroperations.Ontheonehand,theyaresupposedtoexactlyknowtheactualoperatingoutcomesinvariousperiods;andontheotherhand,theyarerequiredtoknowthestatusoft…  相似文献   

16.
The Pond     
Bright clouds of  MayShade half the pond.Beyond,All but one bayOf emeraldTall reedsLike criss- cross bayonetsWhere a bird  once called,Lies brigh as the sun.No one heeds.The light wind frets.And drifts the scumOf may-blossomTill  the  moorhen callsAgainNaught’ s to …  相似文献   

17.
1Izzy'sSkylogdarkstar.swsc.k12.ar.us/~kwhite/skylog.html皓月星空,此站可游。按图索骥,认识星座。非常适合那些想急切获得大量天文学知识的入门者。2.SiliconValeyWebDirector...  相似文献   

18.
PARTONEⅠ.MultipleChoiceQuestions30points2pointsforeachA.DirectionsThispartconsistsoftensentenceseachfollowedbyfourdifferentversionslabeledABCandD.Choosetheonethatistheclosestequiv-alenttotheoriginalintermsofmeaningandex-pressiveness.1.Youcan'tbetooca…  相似文献   

19.
1 Introduction Itisaneasytaskforexperiencedcytopathologiststoidentifycellsunderopticalmicroscopes,butitisverycomplicatedforcomputertocarryonthesamemissionautomatically.Oneofthemajorreasonsisthevariousparametersandfeaturesofcellsthatoftenoverlapwithe…  相似文献   

20.
1 Introduction Generallyspeaking ,productconcurrentdesignislo calizedwithinenterprises .Withtheincessantdevel opmentofInternetandweb basedapplicationtech niques,however ,itisurgentlyneededtocopewiththeproblemsofproductconcurrentandcollaborativedesignindisc…  相似文献   

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