首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
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   

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

5.
Oneoftheactualproblemsinasolid -statephysicsisnumericalcalculationsofphysicalpropertiesofsolids .Inthisworkwepresentthecomputercode″Dynam icsofcrystallattice″ .Thiscomputercodeisdevotedtothenumericalcalculationsofbasicphysicalpropertiesofcrystal.Theprima…  相似文献   

6.
0 INTRODUCTIONGyroisthekeypartofaninertialnavigationsystem .Tosomegyros ,theirthermalbalanceprocesscoststoomuchtimetomeettheneedofinstantstartup .Soestab lishingstartuptemperaturemodels ,withwhichcompensatetemperaturedriftrateisaneffectivewaytoimplementin…  相似文献   

7.
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   

8.
Concretecomponentiswidelyusedinindustrialandcivilconstructions .Young′smodulusisaboutitsbasicmechanicscharacteristic ,whichisindispensableandim portantforstudysuchproblemsasdeformation ,explosivewaveandearthquakewave .TherelationbetweenYoung′smodulusandt…  相似文献   

9.
Corundum(αAl2O3)isanimportanthightemperaturestructuralceramicmaterial.Inordertoimprovetheceramicpropertiesofthematerials,itisessentialforustopreparehighqualitysuperfinepowders(crystallites).Hydrothermalmethodmaybeusedtopreparemanykindsofsuperfinepowders(c…  相似文献   

10.
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.
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   

16.
0 INTRODUCTIONArcweldingprocessplayanimportantroleinthemoderntechnologytojointhemetalplates .Itisimportanttorealizeintelligentweldingrobotsoastoobtainagoodqualityofweldingresults .Theseam trackingsystemisanimportantpartoftheweldingrobot .Manyseam trackin…  相似文献   

17.
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   

19.
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   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号