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.
简介:Inthisarticle,twoterahertztransmissionimagingsystemsarebuiltwitha2.52THzcontinuouswavelaserandtwotypesofsensors.Oneisarrayscanningsystemusinga124124pyro-electricarraycameraasthedetector;theotherisapoint-wisescanningsystemutilizingaGolaycellasthedetector.Theimagingspeedandqualityisbrieflyanalyzed.Terahertz(THz)imagingresultsdemonstratethatthearrayscanningsystemhashigherimagingspeedwithlowerresolution.Thepoint-wisescanningsystemhashigherimagingqualitywithlowerspeed.
简介:Anumericalmodelisproposedforthesimulationofimpulsewavesgeneratedbylandslides.Thefluid-likelandslideismodeledasageneralizednon-Newtonianvisco-plasticfluid.Theconservativelevelsetmethodisextendedtothen-phaseflowandappliedtocapturetheinterfacesofair,waterandlandslide.Numericalresultsshowanexcellentperformanceofthecurrentmodeltocapturethewholeprocessofthelandslideandtheimpulsewavegeneration.
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。
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。
简介:Thispaperpresentstheprincipleofphasemodulationoftheopticalwave,thatisusingadensefringefamilytomodulateanotherfringepattern,anditsapplicationinfringemultiplication.Itisofuniversalsignificanceinopticallyexperimentalmechanics.
简介:ByusingthetheoriesonStokesmulticoloredwaterwavesandtakingthetwo-layeroceanasabasicmodelofstratifiedocean,thepaperanalyzestheproblemsrelatedtotheeffectsofthenonlinearwaterwaveonoffshorestructures.Amathematicalexpressionispresentedtodescribesecondorderwaveradiationconditions.Usingintegralprinciple,theanalyticalintegralsolutionsaregiventoevaluatesecondorderscatteredwaveloadsongeneralverticalcircularcylindersinthetwo-layerocean,andthespecialrecurrenceformulasforinfiniteintegralsoverfreeandstratifiedsurfacesarederived.
简介:Inthispaper,weuseamethodinordertofindexactexplicittravelingsolutionsinthesubspaceofthephasespaceforCH2equations.Thekeyideaisremovingacoupledrelationforthegivensystemsothatthenewsystemscanbesolved.Theexistenceofsolitarywavesolutionsisobtained.Itisshownthatbifurcationtheoryofdynamicalsystemsprovidesapowerfulmathematicaltoolforsolvingagreatmanynonlinearpartialdifferentialequationsinmathematicalphysics.
简介:Themethodofthephaseplaneisemploiedtoinvestigatethesolitaryandperiodictravelingwavesforaclassofnonlineardispersivepartialdifferentialequations.Byusingthebifurcationtheoryofdynamicalsystemstodoqualitativeanalysis,allpossiblephaseportraitsintheparametricspaceforthetravelingwavesystemsareobtained.Itcanbeshownthattheexistenceofasingularstraightlineinthetravelingwavesystemisthereasonwhysmoothsolitarywavesolutionsconvergetosolitarycuspwavesolutionwhenparametersarevaried.Thedifferentparameterconditionsfortheexistenceofsolitaryandperiodicwavesolutionsofdifferentkindsarerigorouslydetermined.
简介:Theequationoftime-domainwavepropagationindispersivemediaandtheexplicitbeampropagationmethodarepresentedinthispaper.Thismethodisdemonstratedbytheshortopticalpulsesinadirectionalcouplerwithsecondorderdispersiveeffectandshowstobeinfullagreementwithformerreferences.Thismethodissimple,easyandpractical.
简介:ThefirstChineseexperimentalwavepowerplant,i.e.,theshoremountcdexperimentalwavepowerplantatthePearlRiverEstuarywassuccessfulintrialpowergenerationonFebruary15,1990.TheplantisonthesouthshoreoftheDawanshanIslandinthePearlRiverEstuary,facingthevastwavingSouthChinaSea.WithadesignedwaveconditionofH1/10=1.5mandT=6.5s,theplannedinstalledcapacityis8kWcomprisingthefirstunitof3kWbrushlessclawpolegeneratorwhichdelivers110VDCcurrentandthesecondunitof5kWbrushlesssinglephasesynchroACgeneratorwhichdelivers220VACcurrent.Atpresent,thefirstunithasbeenputintotrialoperation.
简介:Anacceleratedmicro-foilisusedtoigniteapre-compressedcylindricalshellcontainingdeuterium–tritiumfuel.Thewell-knownshockwaveignitioncriterionandanovelcriterionbasedonheatwaveignitionaredevelopedinthiswork.Itisshownthatforheatignitionveryhighimpactvelocitiesarerequired.Itissuggestedthatamulti-petawattlasercanaccelerateamicro-foiltorelativisticvelocitiesinaveryshorttimeduration(picosecond)ofthelaserpulse.Thecylindricalgeometrysuggestedhereforthefastignitionapproachhastheadvantageofgeometricallyseparatingthenanosecondlasersthatcompressthetargetfromthepicosecondlaserthatacceleratesthefoil.Thepresentmodelsuggeststhatnuclearfusionbymicro-foilimpactignitioncouldbeattainedwithcurrentlyexistingtechnology.
简介:Thelongitudinaloscillationofanonlinearelasticrodwithlateralinertiawasstudied.Basedonthefarfieldandsimplewavetheory,anonlinearSchrodinger(NLS)equationwasestablishedundertheassumptionofsmallamplitudeandlongwavelength.ItisfoundthatthereareNLSenvelopsolitonsinthissystem.FinallythesolitonsolutionoftheNLSequationwaspresented.
简介:Inabiasedphotorefractivecrystal,theprocessoftwoone-dimensionalwavesmixing,i.e.,thedynamicalevolutionofbothpumpbeamandsignalbeam,istracedbynumericallysolvingthecoupled-waveequation.Directsimulationsshowthatthepropagationandstabilityofthetwobeamsarecompletelydeterminedbythesystemparameters,suchastheexternalbiasfield,theintensityandthebeamwaistofthepumpbeam.Byadjustingtheseparameters,onecancontrolthestateoftwoGaussianwavesmixing.Thenumericalresultsarehelpfulforperformingatwo-wavemixingexperiment.
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.