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95 个结果
  • 简介:-ThehydrodynamicforcesonasmoothinclinedcircularcylinderexposedtooscillatingflowwereexperimentallyinvestigatedatReynoldsnumber(Re)intherange40000-200000andKeulegan-Capenternumber(KC)intheintervalfrom5-40.Inthetest,RenumberandKCnumberwerevariedsystematically.Theinertiaforcecoefficient(Cu)andthedragforcecoefficient(CD)inMorisonequationweredeterminedfromthemeasuredloadsandthewaterparticlekinematics.InthisanalysisamodifiedformofMorisonequationwasusedsinceitusesthenormalvelocityandacceleration.Thus,theapplicabilityoftheCrossFlowPrinciplewasassumed.Thisprinciple,simplystated,isasfollows:theforceactinginthedirectionnormaltotheaxisofacylinderplacedatsomeobliqueanglewiththedirectionofflowisexpressedintermsofthenormalcomponentofflowonly,andtheaxialcomponentisdisregarded.Boththetotalin-lineforcecoefficient(CF)andtransverseforce(lift)coefficient(Cf)wereanalyzed

  • 标签: WAVE FORCES HYDRODYNAMIC FORCES inclined CYLINDER
  • 简介:IfdμistheFouriertransformofasmoothmeasure,dμonthehypersphereSn-1(n≥2)thethereexistsaconstantCdependentonlyonnsuchthat|dμ(y)|≤C(1+|y|)-(n-1)/2forally∈Rn.Inthispaper,weshowthattheabovestatementisfalsefornon-smoothmeasures.AndwepresentthecorrespondingestimationsfartheFouriertransformsofcertainnon-smoothmeasuresonSn-1.

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  • 简介:Artesunaeisaderivativeofqinghaosu,withasesquiterpenestructure.Thespecificactionandtheclinicalusesofartesunateareonthepreliminarystage,ontheonehand,artesunatehasspecificactionofbothantiinflammationandantivirus,andalsohasprotectiveeffectonthepulmonaryalveolarmacrophages,whuichmaybeadvantageoustothetreatmentoftheairwaynon-specificinflammationofasthma,.Ontheotherhand,qinghaousuhastheactivitiestorelaxvascularsmoothmuscleandtocausehypotension.Theexpectorantaction,theantitussiveactionandtheantuiasthmaticactionofqinghaosuwerepreported.Artesunatemayalsohaveantiasthmaticactivity,becausetheantimalarialpotencyofartesunateisstrongerthanthatofqinghaosu,andArtesunatecanblockCa^2+influxbyinhibitingcalcium-dependentchloridecurrent.Themainaimsofthispaperaretoinvestigatethesite,themode,andthemechanismofartesunateactiononisolatedtrachealsmoothmusclefromtheguinea-pig.

  • 标签: 豚鼠 气管平滑肌 青蒿素衍生物
  • 简介:Anewsmoothgapfunctionfortheboxconstrainedvariationalinequalityproblem(VIP)isproposedbasedonanintegralglobaloptimalitycondition.Thesmoothgapfunctionissimpleandhassomegooddifferentiableproperties.TheboxconstrainedVIPcanbereformulatedasadifferentiableoptimizationproblembytheproposedsmoothgapfunction.Theconditions,underwhichanystationarypointoftheoptimizationproblemisthesolutiontotheboxconstrainedVIP,arediscussed.Asimplefrictionalcontactproblemisanalyzedtoshowtheapplicationsofthesmoothgapfunction.Finally,thenumericalexperimentsconfirmthegoodtheoreticalpropertiesofthemethod.

  • 标签: 箱约束变分不等式 差距 平滑 全局最优性条件 变分不等式问题 摩擦接触问题
  • 简介:Supportvectormachines(SVMs)havebeenintensivelyappliedinthedomainsofspeechrecognition,textcategorization,andfaultsdetection.However,thepracticalapplicationofSVMsislimitedbythenon-smoothfeatureofobjectivefunction.Toovercomethisproblem,anovelsmoothfunctionbasedonthegeometryofcircletangentisconstructed.Itsmoothesthenon-differentiabletermofunconstrainedSVM,andalsoproposesacircletangentsmoothSVM(CTSSVM).Comparedwithothersmoothapproachingfunctions,itssmoothprecisionhadanobviousimprovement.TheoreticalanalysisprovedtheglobalconvergenceofCTSSVM.NumericalexperimentsandcomparisonsshowedCTSSVMhadbetterclassificationandlearningefficiencythancompetitivebaselines.

  • 标签: 支持向量机 光滑函数 非光滑 切线 光滑逼近函数 文本分类
  • 简介:TheauthorsstudytheasymptoticbehaviorofthesmoothsolutionstotheCauchyproblemsfortwomacroscopicmodels(hydrodynamicanddrift-diffusionmodels)forsemiconductorsandtherelatedrelaxationlimitproblem.First,itisprovedthatthesolutionstothesetwosystemsconvergetotheuniquestationarysolutiontimeasymptoticallywithoutthesmallnessassumptionondopingprofile.Then,verysharpestimatesonthesmoothsolutions,independentoftherelaxationtime,areobtainedandusedtoestablishthezerorelaxationlimit.

  • 标签: 渐近状态 全局光滑解 半导体 流体动力学模型 柯西问题
  • 简介:EfectsofArtesunateonTrachealSmoothMusclefromtheGuineapigPostgraduate∶MaoShengYangSupervisor∶AsociateProf.JianChuXiaoDepa...

  • 标签: ARTESUNATE ester TRACHEAL SMOOTH MUSCLE Acetylcholine
  • 简介:Thecontactanglesofdistilledwaterandmethanolsolutiononthewingsofbutterfliesweredeterminedbyavisualcontactanglemeasuringsystem.Thescalestructuresofthewingswereobservedusingscanningelectronmicroscopy,Theinfluenceofthescalemicro-andultra-structureonthewettabilitywasinvestigated.Resultsshowthatthecontactangleofdistilledwateronthewingsurfacesvariesfrom134.0°to159.2°.Highhydrophobicityisfoundinsixspecieswithcontactanglesgreaterthan150°.Thewingsurfacesofsomespeciesarenotonlyhydrophobicbutalsoresistthewettingbymethanolsolutionwith55%concentration.OnlytwospeciesinParnassiuscannotresistthewettingbecausethemicro-structure(spindle-likeshape)andultra-structure(pinnule-likeshape)ofthewingscalesareremarkablydifferentfromthatofotherspecies.Theconcentrationofmethanolsolutionfortheoccurrenceofspreading/wettingonthewingsurfacesofdifferentspeciesvariesfrom70%to95%.Afterwettingbymethanolsolutionfor10min,thedistilledwatercontactangleonthewingsurfaceincreasesby0.8°-2.1°,showingthepromotionofcapacityagainstwettingbydistilledwater.

  • 标签: 蝴蝶 翅膀 非光滑表面 可湿性 微观结构
  • 简介:AconvexvariationalformulationisproposedtosolvemulticomponentsignalprocessingproblemsinHilbertspaces.Thecostfunctionconsistsofaseparableterm,inwhicheachcomponentismodeledthroughitsownpotential,andofacouplingterm,inwhichconstraintsonlineartransformationsofthecomponentsarepenalizedwithsmoothfunctionals.Analgorithmwithguaranteedweakconvergencetoasolutiontotheproblemisprovided.Variousmulticomponentsignaldecompositionandrecoveryapplicationsarediscussed.

  • 标签: 信号分解 变分形式 耦合 光滑 多组分 多分量信号
  • 简介:ANewmethod,namedatmosphericpressureplasmapolishing,fortheultra-smoothmachiningofthesiliconbasedmaterialsisintroduced.ByinputtingtheCF4gasintotheatmosphericpressureplasmaflame,highdensityreactiveradicalswillbegenerated,whichwillthenreactwiththesiliconbasedmaterials.ThereactionproductisthevaporizationoftheSiF4,whichcanbeeasilyprocessed.Inthisway,theatomicscalematerialremovalcanberealizedandthedefectfreeultra-smoothsurfacecanbeobtained.Anexperimentalsetupisbuiltup,andtheSiCpolishingexperimentiscarriedout.TheAFMtestresultshowsthatthefinishedsurfaceroughness(Ra)canbeimprovedfrom4.529nmto0.926nmin3minutes.

  • 标签: ATMOSPHERIC pressure plasma SILICON BASED MATERIALS
  • 简介:Thisisacontinuationofthepreviouspaper(6).TheauthorsproveHolderandL^pregularityofoperatorsconstructedfromtheobliquederivativeproblemis[6]byestablishingestimatesofpseudodifferentialoperatorswithparameters.

  • 标签: 正则估计 退化边值问题 存在性 斜导出数
  • 简介:Mathematicalprogramswithcomplementarityconstraints(MPCC)isanimportantsubclassofMPEC.ItisanaturalwaytosolveMPCCbyconstructingasuitableapproximationoftheprimalproblem.Inthispaper,weproposeanewsmoothingmethodforMPCCbyusingtheaggregationtechnique.AnewSQPalgorithmforsolvingtheMPCCproblemispresented.Ateachiteration,themasterdirectioniscomputedbysolvingaquadraticprogram,andthereviseddirectionforavoidingtheMaratoseffectisgeneratedbyanexplicitformula.Asthenon-degeneracyconditionholdsandthesmoothingparametertendstozero,theproposedSQPalgorithmconvergesgloballytoanS-stationarypointoftheMPECproblem,itsconvergencerateissuperlinear.Somepreliminarynumericalresultsarereported.

  • 标签: 非线性互补 数学规划 超线性收敛性 逼近法 MPEC问题 SQP算法
  • 简介:Theauthorsconsidertheexistenceandregularityoftheobliquederivativeproblem:{Pu=finΩ,^→tu=gonэΩwherePisasoc~adorderellipticdifferentialoperatoronR^n,ΩisaboundeddomaininR^nand^→tisaunitvectorfieldonthebouudaryofΩ(whichmaybetangentialtotheboundary).Allaboveareassumedwithlimitedsmoothnees.TheauthorsshowthatsolutionuhasanellipticgainfromfinHolderspaces(Theorem1.1).TheauthorsobtainL^nregualrityofsolutioninTbeorem1.3,whichgeneralizestheresultsin[7]tothelimitedsmoothcase.Someoftheapplicationnonlinearproblemsarealsodiscussed.

  • 标签: 偏导数 退化边值问题 存在性 正则性