简介:Bythemethodofdynamicalsystem,weconstructtheexacttravellingwavesolutionsofanewHamiltonianamplitudeequationandtheOstrovskyequation.Basedonthismethod,thenewexacttravellingwavesolutionsofthenewHamiltonianamplitudeequationandtheOstrovskyequation,suchassolitarywavesolutions,kinkandanti-kinkwavesolutionsandperiodictravellingwavesolutions,areobtained,respectively.
简介:Withanincreasingemphasisonrenewableenergyresources,wavepowertechnologyisbecomingoneoftherealisticsolutions.However,the2011tsunamiinJapanwasaharshreminderoftheferocityoftheocean.Itisknownthattsunamisarenearlyundetectableintheopenoceanbutasthewaveapproachestheshoreitsenergyiscompressed,creatinglargedestructivewaves.Thequestionposedhereiswhetheranoscillatingwavesurgeconverter(OWSC)couldwithstandtheforceofanincomingtsunami.Severaltoolsareusedtoprovideananswer:ananalytical3Dmodeldevelopedwithintheframeworkoflineartheory,anumericalmodelbasedonthenon-linearshallowwaterequationsandempiricalformulas.Numericalresultsshowthatrun-upanddraw-downcanbeamplifiedundersomecircumstances,leadingtoanOWSClyingondryground!
简介:Wavepropagationintwo-dimensionalhierarchicalhoneycombstructureswithtwoorderhierarchyisinvestigatedbyusingthesymplecticalgorithm.Byapplyingthevariationalprincipletothedualvariables,thewavepropagationproblemistransformedintoatwo-dimensionalsymplecticeigenvalueproblem.Thebandgapsandspatialfilteringphenomenaareexaminedtofindthestopbandsanddirectionalstopbands.Specialattentionisdirectedtotheeffectsoftherelativedensityandthelengthratioonthebandgapsandphaseconstantsurfaces.Thisworkprovidesnewopportunitiesfordesigninghierarchicalhoneycombstructuresinsoundinsulationapplications.
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:Inthispaper,weuseamethodinordertofindexactexplicittravelingsolutionsinthesubspaceofthephasespaceforCH2equations.Thekeyideaisremovingacoupledrelationforthegivensystemsothatthenewsystemscanbesolved.Theexistenceofsolitarywavesolutionsisobtained.Itisshownthatbifurcationtheoryofdynamicalsystemsprovidesapowerfulmathematicaltoolforsolvingagreatmanynonlinearpartialdifferentialequationsinmathematicalphysics.
简介:一个精确的宏速度模型的评价在地震成像和模型参数倒置起一个重要作用。完整的波形倒置(FWI)是古典数据域倒置方法。然而,FWI的不合身的衣服功能是高度非线性的,并且本地优化不能向本地最小阻止不合身的衣服功能的集中。收敛到全球最小,FWI需要一个好起始的模型或可靠低频率部件和长偏移量数据。在这篇文章,我们在场一个wave-equation-based思考traveltime断层摄影术(WERTT)方法,它能为FWI提供一个好背景模型(起始的模型)并且(最少平方)预先叠深度移植(LS-PSDM)。首先,速度模型被分解成一个low-wavenumber部件(背景速度)和一个high-wavenumber部件(反射率)。第二,主要思考波浪被波浪方程demigration预言,并且思考traveltime由一个自动的拣方法是计算的。最后,思考traveltime剩余的l2标准的不合身的衣服功能被一个基于坡度的方法最小化。建议方法能转换的数字测试表演一个好背景模型,它能为LS-PSDM或FWI被用作一个起始的模型。
简介:CHINAistheonlyoneoftheworld'sthreelarg-esteconomiesinwhichasignificantnumberofitsmostimportantcompaniesarelistedonsharemarketsoutsidedirectregulatorycontroloftheirhomecountry'smainfinancialadministration.AlmostallmajorU.S.companiesarelistedintheU.S.ThesameappliesinJapan.ButmanyChinesecompa-niesarelistedinHongKong,partofChinabutwithseparateregulationandcapitalmarketsfromChina'smainlandeeonomy.FurthermoreasignificantnumberofChinesecompaniesarelistedinLondonandtheU.S.
简介:Theassessmentofthewave-inducedsoilliquefactionplaysakeyroleinthegeotechnicaldesignforoffshorefoundations.Theunderlyingshortcomingsoftheexistingmomentaryliquefactioncriteriaareidentifiedandclarifiedbymechanismanalysesandtherecentfieldobservations.Amodifiedcriterionforthewave-inducedmomentaryliquefactionofasandyseabedisgiventodescribetheverticalporepressuredistributions.Animprovedapproximationofthemomentaryliquefactiondepthisfurtherpresented.Parametricstudyoftheeffectsofthesaturationdegreeofsoilsindicatesthatthismodificationissignificantfortheevaluationofwave-inducedmomentaryliquefaction.
简介:Basedonthetheoryofcomplexfunctionandtheprincipleofhomogenization,harmonicdynamicsstressofaradiallyinfiniteinhomogeneousmediumwithacircularcavityisinvestigated.Duetothesymmetry,wavevelocityisassumedtohavepower-lawvariationintheradialdirectiononly,andtheshearmodulusisconstant.TheHelmholtzequationwithavariablecoefficientisequivalentlytransformedintoastandardHelmholtzequationwithageneralconformaltransformationmethod(GCTM).Thedisplacementsandstressfieldsareproposed.Numericalresultsshowthatthewavenumberandtheinhomogeneityparameterofthemediumhavesignificanteffectsonthedynamicstressconcentrationaroundthecircularcavity.Thedynamicstressconcentrationfactor(DSCF)becomessingularwhentheinhomogeneityparameterofmediumisclosetozero.
简介:Theshiphullsurfaceoptimizationbasedonthewaveresistanceisanimportantissueintheshipengineeringindustry.Thewaveletmethodmayprovideaconvenienttoolforthesurfacehulloptimization.Asapreliminarystudy,weusethewaveletmethodtooptimizethehullsurfacebasedontheMichelwaveresistanceforaWigleymodelinthispaper.Firstly,weexpressthemodel’ssurfacebythewaveletdecompositionexpressionsandobtainareconstructedsurfaceandthenvalidateitsaccuracy.Secondly,werewritetheMichelwaveresistanceformulainthewaveletbases,resultinginasimpleformulacontainingonlytheshiphullsurface’swaveletcoefficients.Thirdly,wetakethesewaveletcoefficientsasoptimizationvariables,andanalyzethemainwaveresistancedistributionintermsofscalesandlocations,toreducethenumberofoptimizationvariables.Finally,weobtaintheoptimalhullsurfaceoftheWigleymodelthroughgeneticalgorithms,reducingthewaveresistancealmostbyahalf.Itisshownthatthewaveletmethodmayprovideanewapproachforthehulloptimization.
简介:Agraphene-coatedmicrofiber(GCM)-basedhybridwaveguidestructureformedbywrappingmonolayergraphenearoundamicrofiberwithlengthofseveralmillimetersispumpedbyananosecondlaserat~1550nm,andmultiordercascadedfour-wave-mixing(FWM)iseffectivelygenerated.Byoptimizingboththedetuningandthepumppower,suchaGCMdevicewithhighnonlinearityandcompactsizewouldhavepotentialforawiderangeofFWMapplications,suchasphase-sensitiveamplification,multi-wavelengthfilter,all-opticalregenerationandfrequencyconversion,andsoon.
简介:在这份报纸,与一致有限深度为水在水波浪的linearised理论构造倾斜的没有波浪的潜力的一个方法以一种系统的方式被介绍。水把免费表面或一个冰封面作为一个薄有弹性的盘子建模。为免费表面的盒子,表面紧张的效果可以被忽视或考虑。这里,没有波浪的潜力是修改Helmholtz方程的单个答案,有在在液体区域的一个点的奇特,他们很快在上面的表面和水区域和腐烂的底部满足条件离开奇特的点。这些在获得解决方案到与象长水平的柱体那样的圆形的剖面图包含身体的倾斜的水波浪问题是有用的沉没或在有作为一块漂浮的橡皮建模的免费表面或一个冰封面的一致有限深度的水里沉浸一半板。最后,与这里构造的没有波浪的潜力有关的上面的表面的形式在很多个数字图形地被描绘设想波浪运动。非倾斜的没有波浪的潜力和上面的表面的结果没有波浪的潜力被获得。这里构造的没有波浪的潜力将在水里在包含无穷地长水平的柱体的水波浪问题的数学学习是有用的、也沉浸一半或完全沉浸。
简介:我们学习二维(2D)在吝啬地的模型的事波浪solitons在2D空间与远程的quadrupolequadrupole相互作用(QQI)由电的四极粒子形成了。在空间的2D事波浪solitons的存在用2DGrossPitaevskii方程(GPE)被预言。我们发现QQIsolitons比dipoledipole相互作用(DDI)有一个更高的团(更小的尺寸和更高的紧张)和更强壮的anisotropy在一样的环境参数下面的solitons。在在2D空间的二相同QQIsolitons之间的各向异性的solitonsoliton相互作用被学习。而且,稳定的各向异性的偶极子solitons被观察到我们的知识,第一次在在各向异性的非局部的立方的非线性下面的2D空间。