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1.
给出了零阶Bessell方程x(t)+1/tx‘(t)+x(t)=0在正则始条件x(0)=a,limx(t)=0下的解。 相似文献
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0 INTRODUCTIONTextresults[1] haveshownthatusingthehydraulicdampersystemtocontroltheseismicresponsesofthestructurewithspaciousfirststoryisveryeffective .Inthispaper ,ananalysismodelofStructure HDSisestablished .Itsettlesafoundationformoreresearchesofthisstr… 相似文献
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Cyclopropylamineisanimportantintermediateforsynthesisofantibioticmedicinessuchasciprofloxacin,profloxacin,sparfloxacin,etc.,andisusedtopreparefinechemicals.Thoughsomeresearchersstudiedthesynthesisofcyclopropylamine,thismethodisnotsuitableforlargescalepr… 相似文献
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0 INTRODUCTIONDetectingobstaclesfromamobilerobotisoneofthekeyissuestothesuccessfulapplicationofthemobilero bot .Thisproblemhasattractedalotofresearchersovertheyears .Theyhaveproposedawidevarietyofapproach esandalgorithms .Butdetectingmovingobstaclesfroma… 相似文献
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Oneoftheactualproblemsinasolid -statephysicsisnumericalcalculationsofphysicalpropertiesofsolids .Inthisworkwepresentthecomputercode″Dynam icsofcrystallattice″ .Thiscomputercodeisdevotedtothenumericalcalculationsofbasicphysicalpropertiesofcrystal.Theprima… 相似文献
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Using genetic algorithm to learn neural network identifier for modeling gyro startup drift rate 总被引:1,自引:0,他引:1
0 INTRODUCTIONGyroisthekeypartofaninertialnavigationsystem .Tosomegyros ,theirthermalbalanceprocesscoststoomuchtimetomeettheneedofinstantstartup .Soestab lishingstartuptemperaturemodels ,withwhichcompensatetemperaturedriftrateisaneffectivewaytoimplementin… 相似文献
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H_∞ two-block design of servo systems 总被引:5,自引:0,他引:5
0 INTRODUCTIONServosystemsarethemostcommonfeedbackcontrolsystems.ButtherearesomeproblemsiftheservosystemisdesignedbytheusualH∞controltheo ry.Becausethereisanintegrationincludedintheplantdynamics,sotheH∞servocontrollerK(s)intheusualS/Ttwo blockproblemwill… 相似文献
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Concretecomponentiswidelyusedinindustrialandcivilconstructions .Young′smodulusisaboutitsbasicmechanicscharacteristic ,whichisindispensableandim portantforstudysuchproblemsasdeformation ,explosivewaveandearthquakewave .TherelationbetweenYoung′smodulusandt… 相似文献
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Corundum(αAl2O3)isanimportanthightemperaturestructuralceramicmaterial.Inordertoimprovetheceramicpropertiesofthematerials,itisessentialforustopreparehighqualitysuperfinepowders(crystallites).Hydrothermalmethodmaybeusedtopreparemanykindsofsuperfinepowders(c… 相似文献
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戴红莲 《武汉理工大学学报(材料科学英文版)》2002,17(3)
1 IntroductionCalciumphosphatematerialsaresimilarincomposi tionsandstructuretobonemineralsandhavegoodbio compatibilityandosteoconducitivityasbonereplacementandaugmentations[1] .Atpresent,calciumphosphatearti ficialbonematerialsaremainlyceramicsandglasses ,… 相似文献
11.
Leadfluoridecrystalexistsintwoforms:cubicphase(βPbF2)andorthorhombicphase(αPbF2).Usually,asgrownPbF2samplespossesscubicsymmetry.SinceDallyandHofstadterdiscoveredthatPbF2crystalcouldbeusedasCherenkovradiatorin1968[1],moreandmoreresearchershavepaidattentiontothe… 相似文献
12.
0 INTRODUCTIONInrecentyears ,muchresearchhasbeenfocusedonthenumericalsolutionofdelaydifferentialequations[1~ 3] .Thesesystemscanbefoundinawidevarietyofscientificandengineeringapplicationssuchascircuitanalysis ,computeraideddesignandnonlinearpowersystems .In… 相似文献
13.
雷家珩 《武汉理工大学学报(材料科学英文版)》2002,17(3)
1 IntroductionNormalspinelLiMn2 O4 possessesspecificmemoryeffectforlithiumion .Manganeseisrichinnaturalre sourcesandhasnopollutiontotheenvironment .Extrac tionofmicro lithiumfromseawaterandsalt lakebrinebylithiummanganeseoxideisregardedasthemostprospec tive… 相似文献
14.
H∞controltheoryhasmadesignificantadvancementforbothlinearandnonlinearsystems.ThesolvabilityconditionsfornonlinearsystemswerepresentedintermsofHamiltonJaccobiequations(HJE)orinequalities(HJI)[1,2].However,theseHJEsorHJIsaredifficulttosolvegenerally.Thus,agre… 相似文献
15.
TheFIMmicrographsofbinaryorderedintermetalliccompoundsarecomparablewiththoseofpuremetals,whichhaveperfectringstructure.Andinterestingenough,generallyonlyoneatomspeciescontributestotheimages[1,2].However,itisnotclearwhichatomspeciesimagesinmostsystems,andd… 相似文献
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0 INTRODUCTIONArcweldingprocessplayanimportantroleinthemoderntechnologytojointhemetalplates .Itisimportanttorealizeintelligentweldingrobotsoastoobtainagoodqualityofweldingresults .Theseam trackingsystemisanimportantpartoftheweldingrobot .Manyseam trackin… 相似文献
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Inrecentyears,freeweightingmatrixapproachisanimportanttechniquetodealwiththedelay dependentstabilityproblemforsystemswithtime varyingdelay.Inthispaper,somesimplifieddelay dependentsta bilitycriteriaarederivedbyusingasimpleintegralinequality,inwhichnofreeweigh tingmatrixisinvolved.Thesepresentedre sultsturnouttobeequivalenttosomelatestresultsbutincludetheleastnumberofvari ables.Thisfeaturecanlargelyreducethe
computationalburdenoftheobtainedLMIconditions. 相似文献
18.
Separationofenantiomersofchiralcom poundsforbothanalyticalandpreparativepurposesisanattractivetopic ,especiallyinthefieldsofor ganicandpharmaceuticalchemistry .Directgaschromatographicenantiomerseparationusingchiralstationaryphases (CSPs)isasimpleandeffe… 相似文献
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0 INTRODUCTIONTheRF excitedwaveguideCO2 lasershavebeende velopedforabouttwodecadesandhavemadegreatprogress.ThisisduetothefactthatRFdischargehasseveraladvantagesoverdcdischarge[1~ 4 ] ,suchasgreaterstabilityathigherpowerloadings ,loweroperatingvoltag es ,highe… 相似文献
20.
Robot soccer action selection based on Qlearning 总被引:1,自引:0,他引:1
0 INTRODUCTIONNomatterthedomain ,multirobotsystemdesignischallengingbecauseperformancedependssignificantlyonissuesthatsolelyfrominteractionbetweenrobots .Traditionalmethodsofconstructingintelligentroboticsystems,employingartificialintelligence basedtech … 相似文献