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1.
利用Rabinowitz鞍点定理及Ambrosetti-Rabinowitz山路经理以及它们相应的临界点的Morse指标估计证明了二类非自治Hamilton系统给定极小周期的次调和解的存在性。  相似文献   

2.
0 INTRODUCTIONTextresults[1] haveshownthatusingthehydraulicdampersystemtocontroltheseismicresponsesofthestructurewithspaciousfirststoryisveryeffective .Inthispaper ,ananalysismodelofStructure HDSisestablished .Itsettlesafoundationformoreresearchesofthisstr…  相似文献   

3.
Cyclopropylamineisanimportantintermediateforsynthesisofantibioticmedicinessuchasciprofloxacin,profloxacin,sparfloxacin,etc.,andisusedtopreparefinechemicals.Thoughsomeresearchersstudiedthesynthesisofcyclopropylamine,thismethodisnotsuitableforlargescalepr…  相似文献   

4.
Leadfluoridecrystalexistsintwoforms:cubicphase(βPbF2)andorthorhombicphase(αPbF2).Usually,asgrownPbF2samplespossesscubicsymmetry.SinceDallyandHofstadterdiscoveredthatPbF2crystalcouldbeusedasCherenkovradiatorin1968[1],moreandmoreresearchershavepaidattentiontothe…  相似文献   

5.
0 INTRODUCTIONGyroisthekeypartofaninertialnavigationsystem .Tosomegyros ,theirthermalbalanceprocesscoststoomuchtimetomeettheneedofinstantstartup .Soestab lishingstartuptemperaturemodels ,withwhichcompensatetemperaturedriftrateisaneffectivewaytoimplementin…  相似文献   

6.
1 IntroductionNormalspinelLiMn2 O4 possessesspecificmemoryeffectforlithiumion .Manganeseisrichinnaturalre sourcesandhasnopollutiontotheenvironment .Extrac tionofmicro lithiumfromseawaterandsalt lakebrinebylithiummanganeseoxideisregardedasthemostprospec tive…  相似文献   

7.
H∞controltheoryhasmadesignificantadvancementforbothlinearandnonlinearsystems.ThesolvabilityconditionsfornonlinearsystemswerepresentedintermsofHamiltonJaccobiequations(HJE)orinequalities(HJI)[1,2].However,theseHJEsorHJIsaredifficulttosolvegenerally.Thus,agre…  相似文献   

8.
1 IntroductionCalciumphosphatematerialsaresimilarincomposi tionsandstructuretobonemineralsandhavegoodbio compatibilityandosteoconducitivityasbonereplacementandaugmentations[1] .Atpresent,calciumphosphatearti ficialbonematerialsaremainlyceramicsandglasses ,…  相似文献   

9.
TheFIMmicrographsofbinaryorderedintermetalliccompoundsarecomparablewiththoseofpuremetals,whichhaveperfectringstructure.Andinterestingenough,generallyonlyoneatomspeciescontributestotheimages[1,2].However,itisnotclearwhichatomspeciesimagesinmostsystems,andd…  相似文献   

10.
0 INTRODUCTIONDetectingobstaclesfromamobilerobotisoneofthekeyissuestothesuccessfulapplicationofthemobilero bot .Thisproblemhasattractedalotofresearchersovertheyears .Theyhaveproposedawidevarietyofapproach esandalgorithms .Butdetectingmovingobstaclesfroma…  相似文献   

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