简介：Rabbitlimbalcornealepithelialcells,cornealendothelialcellsandkeratocyteswereculturedonamnioticmembrane.Phasecontrastmicroscopeexaminationwasperformeddaily.Histologicalandscanelectronmicroscopicexaminationswerecarriedouttoobservethegrowth,arrangementandadhesionofcultivatedcells.Resultsshowedthatthreecornealcelltypesseededonamnioticmembranegrewwellandhadnormalcellmorphology.Culturedcellsattachedfirmlyonthesurfaceofamnioticmembrane.Cornealepithelialcellsshowedsingularlayerorstratification.Cellboundarieswereformedandtightlyopposed.Cornealendothelialcellsshowedcobblestoneorpolygonalmorphologiccharacteristicsthatappeareduniforminsize.Thecellulararrangementwascompact.Keratocyteselongatedandshowedtriangleordendriticmorphologywithmanyintercellularjointswhichcouldformnetworks.Inconclusion,amnioticmembranehasgoodscaffoldproperty,diffusioneffectandcompatibilitywithcornealcells.Thebasementmembranesideofamnioticmembranefacilitatedthegrowthofcornealepithelialcellsandendothelialcellsandcelljunctionsweretightlydeveloped.Thespongylayerofamnioticmembranefacilitatedthegrowthofkeratocytesandintercellularjointswererich.Amnioticmembraneisanidealbiomaterialforlayeringtissueengineeredcornea.

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简介：Thankstothedevelopmentofmetallographicandopticaltechniques,thequantitativecharacterisationofthegeometryofroughsurfaceshasbecomeveryusefulinpracticalapplications.Today,numerousdifferentmethodsareavailablefordeterminingthreedimensionalco-ordinates,linearprofilesorheightcontourstoareasonabledegreeofaccuracyandwithinanacceptabletimeframe,andforevaluatingsuchdata.Inthisarticle,theuseofsuchtechniquesinthefieldoffractographyisdemonstratedwithreferencetoanumberofcasestudiesdealtwithbytheauthor'sownteam,supplementedbyseveralexamplesfromotherresearchgroups.Thefollowingexamplesarediscussed:Inaceramicmaterialdifferentfracturepathswerediscernedcorrespondingtodifferenttesttemperatures.Inhardmetals,itwasshownthathoththesub-criticalandsupercriticalpropagationofcracksoccurreddalongthesamepath.Frommeasurementsoftheproportionoffracturesurfacesoccurringalongandinthevariousdifferentphasespresentandthedepthofdimplesoccurringduringductilefractureinthebinderphase,thefractureenergyofEC-Co-hardalloyswithdifferentcobaltcontentsandtungstencarbidegrainsizeswascalculatedandfoundtobeinexcellentagreementwithactualexperimentalresults.Inthecaseofceramicfibre-aluminiummatrixcpmpositematerials,bymeasuringthebeightdistributionofthepositionsoffractureofthefibres,theloadtransferintheregionofthefracturesurfacewasdetermined.withthisinformationamodelwasdevelopedwhichexplainsthesignificantvariationinstrengthofthesematerialsFinally,amodelwasdevelopedformetallicmaterialsusingwhich,fromtheexperimentallydetermineddistributionsoftheheightandinclinationofthefracturefacets,thestressintensityofroughnessinducedcrackclosingcouldheaccuratelypredicted.

简介：Thenon-minimumphasefeatureoftail-controlledmissileairframesisanalyzed.Threeselectionstrategiesfordesiredperformanceindexesarepresented.Anaccelerationautopilotdesignmethodologybasedonoutputfeedbackandoptimizationisproposed.Performanceandrobustnesscomparisonsbetweenthetwo-loopandclassicalthree-looptopologiesaremade.Attemptstoimprovetheclassicalthree-looptopologyarediscussed.Despitethesameopen-loopstructure,theclassicalthree-loopautopilotshowsdistinctcharacteristicsfromatwo-loopautopilotwithPIcompensator.Boththetwo-loopandthree-looptopologiescanstabilizeastaticunstablemissile.However,thefiniteactuatorresourceisthecrucialfactordominatingautopilotfunction.

简介：选文简介《三个小冒险家》（ThreeAdventurepw）选自美国作家卡罗尔·拉瑞·布林克（CarolRyrieBrink）的小说《凯蒂·伍德劳恩》（CaddieWoodlawn，1935）。卡罗尔·拉瑞·布林克是美国最知名、最优秀的儿童文学作家之一，一生写了三十多部青少年读物。卡罗尔在她的作品里喜欢保留一些真实性。她出生于爱达荷州．八岁时父母双亡，

简介：Westudythestructureofinvertiblesubstitutionsonthree-letteralphabet.Weshowthatthereexistsafi-nitesetSofinvertiblesubstitutionssuchthatanyinvertiblesubstitutioncanbewrittenasIwoσ1oσ2…σk,whereIwistheinnerautomorphismassociatedwithw,andσj∈Sforl≤j≤k.Asaconsequence,Misthematrixofaninvertiblesubstitutionifandonlyifitisafiniteproductofnon-negativeelementarymatrices.

简介：<正>Inthispaper,westudythebifurcationproblemsofroughheteroclinicloupscormectingthrecsaddlepointsforahigher-dimensionalsystem.Undersometransversalconditionsandthenontwistedcondition.theexistence.uniqueness.ndincoexistenccofthcl-heteroclinicloopwiththrecortwosaddlepomts.l-homoclinicorbitandl-periodicorbitnearTareobtained.Nleanwhile,thebifurcationsurfacesandexistenceregionsarealsogiven.Moreover.theabovebifurcationresultsareextendedtothecaseforheteroclinicloopwithlsaddlepoints.

简介：TheSeventhNationalPeople’sCon-gress(NPC)concludeditsfifth,andlast,sessiononApril3,1992inBeijing,endorsingtheStateCouncil’sgovernmentworkreport,threedraftlaws,andalsogiv-ingthego-aheadtothelong-disputedThreeGorgesdamproject.Ofthe2,633deputiesattendingclos-ingsessionheldinGreatHallofthePeople,1,767votedinfavourofthe57-billionyuan($10.5billion)ThreeGorgesdamprojecton

简介：Inthispaperareviewoncurrentresearchon3DCMispresented,andanalternativeapproachbyintegratingtheconceptsandtechniquesofobject-orientedmethodandComputerAidedDesign(CAD)issuggested.Throughtheapproachurbanspatialentitiesasobjectsareextracted,whicharerepresentedwithprimary3Delements(node,edge,faceandbody)andtheircombinations.Inthelightoftheconceptofobject,themethodsupportsthemultiplerepresentationofLevelofDetails(LOD).Moreimportantly,topologicalrelationshipsbetweenobjectsaredescribedsothat3Dtopologicaloperationscanbeimplemented.

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简介：LOSANGELES-ThreemenwerechargedFridaywiththemurderandrobberyofDr.HaingS.Ngor,theCambodianactorwhowonanOscarforhisrolein"TheKillingFields".

简介：Ｕｐｈｏｌｄ＂ＴｈｒｅｅＳｔｒｅｓｓｅｓ＂ｔｏＩｍｐｒｏｖｅＦａｍｉｌｙＰｌａｎｎｉｎｇＩｍｐｌｅｍｅｎｔａｔｉｏｎＲｏｎｇｃｈｅｎｇＣｉｔｙ（ａｃｉｔｙａｔｔｈｅｃｏｕｎｔｙｌｅｖｅｌ），ｔｈｅｂｉｒｔｈｐｌａｃｅｏｆｔｈｅ＂ｔｈｒｅｅｓｔｒｅｓｓ...

简介：在这份报纸，我们与不可压缩的条件为3DMHD方程的答案考虑整齐标准。由使用一些古典不平等，我们分别地以速度地和磁场的一个部件在某些足够的条件下面获得三维的MHD方程的强壮的答案的整齐。

简介：Wepresentthreeopencombinatorialoptimizationproblemsfromthestandpointofcompetitiveanalysis,inthecasethatthereisnocompleteinformation.

简介：Ithasn’tbeeneasy,butalmostalloftheworkontheThreeGorgesProjectisonschedule,accordingtoacorporationoverseeingconstructionofthedam.TheChinaYangtzeThreeGorgesProjectDevelopmentCorporationhasreportedthatcontractorsandotherstaffareworkinghardtoensurethatthefloodseasondoesnotslowthedamproject.Thecompanyrecentlydetailedthemammothtasksthathavetakenplacesofar

简介：＂ＴｈｒｅｅＳｔｒｅｓｓｅｓ＂ｉｎＣｈｉｎａ＇ｓＦａｍｉｌｙＰｌａｎｎｉｎｇＰｒｏｇｒａｍｍｅＺｈｅｎｇＰｉｎｇｙｕｅＴｈｅ＂ｔｈｒｅｅｓｔｒｅｓｓｅｓ＂ｒｅｆｅｒｔｏｔｈｅｓｔｒｅｓｓｅｓｌａｉｄｏｎＩＥＣ，ｃｏｎｔｒａｃｅｐｔｉｏｎａｎｄｒｅｇｕ...

简介：Threetypesofplasmaionsourcesdesigned,manufacturedandoptimizedintheAcceleratorsandIonSourcesDepartment,NuclearResearchCenter,AtomicEnergyAuthorityareintroduced.Differentmeanswereinvestigatedtogeneratethedischargecurrentandionbeamcurrentextractedfromtheplasma.ThevariousplasmasdescribedincludeaDCglowdischargeplasma,anarcdischargeplasmaandaradiofrequencydischargeplasma.

简介：Afinite-ratemethodisusedtosimulatethethree-dimensionalcombustionprocessinaplasmageneratorwithCH4asthefuel.ThesimulationwasrunwithRNGk-εmodeltosimulateturbulence,witheddy-dissipation-concept(EDC)modeltosimulatethecombustionandwithdiscreteordinatesmodeltosimulateradiation.Thenumericalresultsshowthattheflowfieldcharacteristicsandtheparameterdistributionsareundertheconditionofrichfuels,andtheseresultsprovidevaluableinformationwhenoptimizingtheplasmageneratordesignandorganizingitsflowfields.