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500 个结果
  • 简介:[1]Holthuijsen,L.H.,Booij,N.andHerbers,T.H.,1989.Apredictionmodelforstationary,short-crestedwavesinshallowwaterwithambientcurrents,CoastalEngineering,13,23~54.[2]Lavrenov,I.V.etal.,1998.Estimationoftheextremeheightsofwindwavesinthecoastalseaarea,Proceedings5thinternationalworkshoponwavehindcastingandforecasting,January26~30,Melbourne,FL.USA,439~450.[3]LILuping,1998.TheeffectontheseafloorerosiononwavehindcastingincoastalareasofBohaiSea,Proceedings5thinternationalworkshoponwavehindcastingandforecasting,January26~30,Melbourne,FL.USA,421~432.

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  • 简介:Inthisarticle,twoterahertztransmissionimagingsystemsarebuiltwitha2.52THzcontinuouswavelaserandtwotypesofsensors.Oneisarrayscanningsystemusinga124124pyro-electricarraycameraasthedetector;theotherisapoint-wisescanningsystemutilizingaGolaycellasthedetector.Theimagingspeedandqualityisbrieflyanalyzed.Terahertz(THz)imagingresultsdemonstratethatthearrayscanningsystemhashigherimagingspeedwithlowerresolution.Thepoint-wisescanningsystemhashigherimagingqualitywithlowerspeed.

  • 标签: 太赫兹成像 连续波激光器 透射成像 扫描系统 成像速度 成像质量
  • 简介:在台湾的海岸附近的波浪精力资源与盖住一个3年的时期(20072009)的波浪浮标数据被调查。在这个区域以内的十一个学习地点在21.5跳了

  • 标签: 台湾海峡 评估 能源 海浪 沿岸 澎湖海域
  • 简介:Anumericalmodelisproposedforthesimulationofimpulsewavesgeneratedbylandslides.Thefluid-likelandslideismodeledasageneralizednon-Newtonianvisco-plasticfluid.Theconservativelevelsetmethodisextendedtothen-phaseflowandappliedtocapturetheinterfacesofair,waterandlandslide.Numericalresultsshowanexcellentperformanceofthecurrentmodeltocapturethewholeprocessofthelandslideandtheimpulsewavegeneration.

  • 标签: 山体滑坡 数值模拟 冲击波 粘塑性流体 水平集方法 数值模型
  • 简介:这份报纸的目的是为Hormuz的海峡介绍一个适当单向性的波浪光谱模型。研究集中于在这个区域估计标准波浪光谱模型的性能。由基于最近出版的珍贵测量数据评估如此的模型,刻度过程在如此的标准模型上被进行了到达在一个修改标准之间的一个更好的词语索引光谱模型和观察领域系列。刻度开始关于与四个可得到的测量车站有关的四个不同方向被执行。那么,它为一个提名的模型导致系数的四个集合。下次,它继续被到达就对方向感觉迟钝的一个模型。结果清楚地证明国际拖引坦克会议(ITTC)模型在这个区域是比联合诺思海波浪工程(JONSWAP)和Pierson和Moskowitz(下午)模型更适当的,甚至没有任何刻度。然而,修正在改进模型的一致上是成功的。

  • 标签: 标准模型 波谱 单向 海峡 校准程序 测量数据
  • 简介:在电子上控告的喷气的非线性的不稳定性用描述一口液体喷气拉长并且变瘦的管理电镀物品水动力学方程被学习。到空间和时间演变骚乱的一个喷气流动系统题目被考虑。在线性阶段,瑞利和进行的喷气流动不稳定性模式被揭开。在流动的非线性的不稳定性经由三个一组被探索揭开的反响的波浪fa-vorable操作模式不以前在这个问题的线性学习检测了。特别地,喷气半径显著地被减少,并且喷气的电场在非线性的学习下面是适当地面向的。考虑回声三个一组模式提供对由于正切的电场效果拉长并且变瘦的一口喷气的更好数学的描述,这被发现。在喷气流动系统的线性、非线性的不稳定性结果被介绍并且讨论。

  • 标签: 非线性的波浪相互作用 三个一组波浪 时间空间的不稳定性
  • 简介:Thispaperpresentstheprincipleofphasemodulationoftheopticalwave,thatisusingadensefringefamilytomodulateanotherfringepattern,anditsapplicationinfringemultiplication.Itisofuniversalsignificanceinopticallyexperimentalmechanics.

  • 标签: FRINGE PATTERN IMAGE processing/photocarrier photomechanics FRINGE
  • 简介:ByusingthetheoriesonStokesmulticoloredwaterwavesandtakingthetwo-layeroceanasabasicmodelofstratifiedocean,thepaperanalyzestheproblemsrelatedtotheeffectsofthenonlinearwaterwaveonoffshorestructures.Amathematicalexpressionispresentedtodescribesecondorderwaveradiationconditions.Usingintegralprinciple,theanalyticalintegralsolutionsaregiventoevaluatesecondorderscatteredwaveloadsongeneralverticalcircularcylindersinthetwo-layerocean,andthespecialrecurrenceformulasforinfiniteintegralsoverfreeandstratifiedsurfacesarederived.

  • 标签: STRATIFIED ocean SECOND order wave two
  • 简介:Inthispaper,weuseamethodinordertofindexactexplicittravelingsolutionsinthesubspaceofthephasespaceforCH2equations.Thekeyideaisremovingacoupledrelationforthegivensystemsothatthenewsystemscanbesolved.Theexistenceofsolitarywavesolutionsisobtained.Itisshownthatbifurcationtheoryofdynamicalsystemsprovidesapowerfulmathematicaltoolforsolvingagreatmanynonlinearpartialdifferentialequationsinmathematicalphysics.

  • 标签: SOLITARY Wave Solution BIFURCATION Theory DYNAMICAL
  • 简介:这块地水平地极化了超声砍2/2散发的波浪压电的合成正常探查被学习。严格地,二不同表面力量的分析领域解决方案被推出,领域分发和择向性模式被数字计算给。垂直的散发的地砍波浪理论上并且与实验相比被获得。择向性模式的试验性的结果遵守了理论预言,它为变换器的设计申请提供了理论基础。

  • 标签: 声波 剪切波 声音传播 波动
  • 简介:Themethodofthephaseplaneisemploiedtoinvestigatethesolitaryandperiodictravelingwavesforaclassofnonlineardispersivepartialdifferentialequations.Byusingthebifurcationtheoryofdynamicalsystemstodoqualitativeanalysis,allpossiblephaseportraitsintheparametricspaceforthetravelingwavesystemsareobtained.Itcanbeshownthattheexistenceofasingularstraightlineinthetravelingwavesystemisthereasonwhysmoothsolitarywavesolutionsconvergetosolitarycuspwavesolutionwhenparametersarevaried.Thedifferentparameterconditionsfortheexistenceofsolitaryandperiodicwavesolutionsofdifferentkindsarerigorouslydetermined.

  • 标签: 行波解 非线性扩散方程 相平面 孤波 周期性 偏微分方程
  • 简介:Theequationoftime-domainwavepropagationindispersivemediaandtheexplicitbeampropagationmethodarepresentedinthispaper.Thismethodisdemonstratedbytheshortopticalpulsesinadirectionalcouplerwithsecondorderdispersiveeffectandshowstobeinfullagreementwithformerreferences.Thismethodissimple,easyandpractical.

  • 标签: 时间域计算 分散介质 光波传播
  • 简介:ThefirstChineseexperimentalwavepowerplant,i.e.,theshoremountcdexperimentalwavepowerplantatthePearlRiverEstuarywassuccessfulintrialpowergenerationonFebruary15,1990.TheplantisonthesouthshoreoftheDawanshanIslandinthePearlRiverEstuary,facingthevastwavingSouthChinaSea.WithadesignedwaveconditionofH1/10=1.5mandT=6.5s,theplannedinstalledcapacityis8kWcomprisingthefirstunitof3kWbrushlessclawpolegeneratorwhichdelivers110VDCcurrentandthesecondunitof5kWbrushlesssinglephasesynchroACgeneratorwhichdelivers220VACcurrent.Atpresent,thefirstunithasbeenputintotrialoperation.

  • 标签: power PLANT ESTUARY model test TIDE
  • 简介:Anacceleratedmicro-foilisusedtoigniteapre-compressedcylindricalshellcontainingdeuterium–tritiumfuel.Thewell-knownshockwaveignitioncriterionandanovelcriterionbasedonheatwaveignitionaredevelopedinthiswork.Itisshownthatforheatignitionveryhighimpactvelocitiesarerequired.Itissuggestedthatamulti-petawattlasercanaccelerateamicro-foiltorelativisticvelocitiesinaveryshorttimeduration(picosecond)ofthelaserpulse.Thecylindricalgeometrysuggestedhereforthefastignitionapproachhastheadvantageofgeometricallyseparatingthenanosecondlasersthatcompressthetargetfromthepicosecondlaserthatacceleratesthefoil.Thepresentmodelsuggeststhatnuclearfusionbymicro-foilimpactignitioncouldbeattainedwithcurrentlyexistingtechnology.

  • 标签: LASER PLASMA FAST IGNITION Heat WAVE
  • 简介:Thelongitudinaloscillationofanonlinearelasticrodwithlateralinertiawasstudied.Basedonthefarfieldandsimplewavetheory,anonlinearSchrodinger(NLS)equationwasestablishedundertheassumptionofsmallamplitudeandlongwavelength.ItisfoundthatthereareNLSenvelopsolitonsinthissystem.FinallythesolitonsolutionoftheNLSequationwaspresented.

  • 标签: 非线性弹性棒 远声场 NLS方程 纵向振荡
  • 简介:Inabiasedphotorefractivecrystal,theprocessoftwoone-dimensionalwavesmixing,i.e.,thedynamicalevolutionofbothpumpbeamandsignalbeam,istracedbynumericallysolvingthecoupled-waveequation.Directsimulationsshowthatthepropagationandstabilityofthetwobeamsarecompletelydeterminedbythesystemparameters,suchastheexternalbiasfield,theintensityandthebeamwaistofthepumpbeam.Byadjustingtheseparameters,onecancontrolthestateoftwoGaussianwavesmixing.Thenumericalresultsarehelpfulforperformingatwo-wavemixingexperiment.

  • 标签: 光折变晶体 两波混频 横向效应 数值求解 耦合波方程 动态演化
  • 简介:Aseriesofhydraulicmodeltestsarecarriedouttoinvestigaterandomwaverun-upandovertoppingonsmooth,impermeablesingleslopeandcompositeslope.Basedontheanalysisoftheinfluencesofwavesteepness,structureslope,incidentwaveangle,widthofthebermandwaterdepthonthebermandthewaverun-up,empiricalformulasforwaverun-upondikeareproposed.Moreover,empiricalformulaonestimatingthewaverun-uponcompositeslopewithmultiplebermsispresentedforpracticalapplicationofcomplexdikecross-section.Thepresentstudyshowsthattheinfluencefactorsforwaveovertoppingarealmostthesameasthoseforwaverun-upandthetrendofthewaveovertoppingvariationwithmaininfluenceparametersisalsosimilartothatforwaverun-up.Thetrendofthewaveovertoppingvariationscanbewelldescribedbytwomainfactors,i.e.thewaverun-upandthecrestfreeboardofthestructure.Anewpredictionmethodforwaveovertoppingisproposedforrandomwaves.Theproposedpredictionformulasareappliedtocasestudyofoverfortycasesandtheresultsshowthatthepredictionmethodsaregoodenoughforpracticaldesignpurposes.

  • 标签: 不规则波 预测 随机波浪 水工模型试验 经验公式 公式应用