简介：1.IntroductionThroughoutthispaperweshallusethefollowingnotation.RmxnandCoxsdenotethesetsofrealandcomplexmxnmatrices,respectively,R'andC'denotethesetsofrealandcomplexn-dimentionalcolumnvectors,respectively.ThesuperscriptHmeanstheconjugatetransposeofma...

简介：Someofthemathematicalpropertiesoftheinterfacebetweentwoincompressibleinviscidandimmisciblefluidswithdifferentdensitiesundertheinfluenceofaconstantgravityfieldgareinvestigated.ThepurposeofthispaperistoprovethatlinearlyunstablemodesforRayleigh-Taylorinstabilitiesgivebirthtononlinearinstabilitiesforthefullnonlinearsystem.Themainingredientisageneralinstabilitytheoreminananalyticframeworkwhichenablesustogofromlineartononlinearinstabilities.

简介：在这篇文章，七个月周围的噪音数据和10个事件从Ningxia在七个数字车站记录了()控制来源爆炸数据记录了由的地区性的地震网络和5500-t15暂时并且7个永久地震车站被用来测量基本模式瑞利波浪的分散曲线。学习区域与0.1杳慲散眠被划分成格子吗？

简介：与作为分别地散布和镜子的部件使模型和零平均数的随机的窦状隙褪色的改进瑞利一起，一个随机的模拟模型为使波形褪色的瑞利和Rician的产生被建议。与存在相比随机的模型，建议模拟器需要仅仅一试用就算样品的数字不足够大，获得需要的统计性质。而且，建议模拟模型能直接为不同褪色的情形产生多重uncorrelated波形，例如单个输入的单个产量的频率选择隧道和多重输入的多重产量的隧道。建议模拟器有效、精确的表演评估和比较表演。

简介：Inordertobetterassesstheperformanceofwirelesscommunicationsystems,itisdesirabletoproducemultipleRayleighfadingenvelopeswithspecifiedcorrelations.Inthispaper,weanalyzetheoreticallyaprocedurewhichgeneratescorrelatedGaussianrandomvariablesfromindependentGaussianrandomvariablesandgiveaphysicalexplanationforthelimitationofthisprocedure.Then,basedonsomeuncorrelatedRayleighfadingenvelopes,asimplebutefficientprocedureforgeneratinganarbitrarynumberofcross-correlatedRayleighfadingenvelopesisproposed.Simulationresultsandcomputationalcomplexityanalysisarepresented,whichshowthattheproposedmethodhassomeadvantages,suchashighaccuracy,lowcomputationalcomplexityandeasyimplementation,overtheconventionalsimulationmethod.

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简介：瑞利波浪分散信号对地下的调查重要。传统地，uniformed踪迹间距在表面波浪调查被采用。然而，因为地点条件的限制，在一些情况中，不平的踪迹间距经常被遇到。为了在瑞利的分散数据构造学习不平的踪迹间距的影响，飘动，数据获得与修理的地震检波器和活动来源的一个线性数组基于一个2.5D领域布局被执行。观察方向控制测量的踪迹间距。最后的结果证明踪迹不一致在构造的瑞利波浪分散特征上有重要影响。当观察角度是超过45时

简介：Inthispaper,weinvestigatetheRayleigh-Taylorinstabilityproblemfortwocompressible,immiscible,inviscidflowsrotatingwithaconstantangularvelocity,andevolvingwithafreeinterfaceinthepresenceofauniformgravitationalfield.FirstweconstructtheRayleigh-Taylorsteady-statesolutionswithadenserfluidlyingabovethefreeinterfacewiththesecondfluid,thenweturntoananalysisoftheequationsobtainedfromlinearizationaroundsuchasteadystate.Inthepresenceofuniformrotation,thereisnonaturalvariationalframeworkforconstructinggrowingmodesolutionstothelinearizedproblem.Usingthegeneralmethodofstudyingafamilyofmodifiedvariationalproblemsintroducedin[1],weconstructnormalmodesolutionsthatgrowexponentiallyintimewithratelikeet■whereξisthespatialfrequencyofthenormalmodeandtheconstantcdependsonsomephysicalparametersofthetwolayerfluids.AFouriersynthesisofthesenormalmodesolutionsallowsustoconstructsolutionsthatgrowarbitrarilyquicklyintheSobolevspaceH~k,andleadstoanill-posednessresultforthelinearizedproblem.Moreover,fromtheanalysisweseethatrotationdiminishesthegrowthofinstability.Usingthepathologicalsolutions,wethendemonstratetheill-posednessfortheoriginalnon-linearprobleminsomesense.

简介：近似却分析的答案粘滞Rayleigh-Taylor不稳定性(RTI)最近广泛地由于它的清澈在理论、数字的调查被使用了。在这份报纸，生长率为的一个修改分析答案粘滞不可压缩的液体的RTI基于一个近似方法被获得。它的精确性数字地被验证显著地为不同粘性比率和Atwood数字在整个波浪数字范围与以前的那比较被改善。而且，这个答案被扩展为粘滞包括集中散开效果的RTI。

简介：ThemodelingmethodologiesandcalculationofdynamicresponseofundergroundstructureunderRayleighwavesisinvestigatedinthispaper.FirstthefreefieldresponsesunderRayleighwavesareanalyzedandthenumericalresultsagreewellwiththetheoreticalresults.Then,theapproximateRayleighwavesareputforwardbasedonthepreliminaryre-search,andRayleighwavefieldisobtainedthroughfastFouriertransformtechnique.Takingautilitytunnelasanexample,itsdynamicresponsesunderRayleighwavesiscalculatedbyABAQUS.Theresultsdemonstratethatbendingdeformationisthemaincomponentofstructuraldeformationandthedeformationatthetopofthestructureisabouttwiceasmuchasthatatbottomofthestructure.Theeffectofsoil-structureinterfaceandtheburieddepthofundergroundstructurearealsoinvesti-gatedviaparameteranalysis.Fortheshallowburiedundergroundstructures,Rayleighwavescanbethekeyfactortocontroltheresponsesanddamageofthestructure.

简介：以便理解材料的粘弹性，这研究被进行了理论上学习粘弹性的瑞利波浪的繁殖特征。一个模型在粘弹性的中等表面上为超声的搏动的激光产生被介绍。指了凯尔文模型，频率方程和粘弹性的瑞利的正常排水量波浪被导出，分散和变细上的粘弹性的模量的影响被讨论。从理论计算，瑞利波浪的变细上的粘弹性的效果在它的分散上多于那，这被显示出。在弱粘性的情况中，粘弹性的瑞利波浪的变细与粘性模量直接成正比；效果砍变细上的粘性是多于体积粘性的大部分。粘弹性的瑞利波浪的短暂反应也用Laplace和Hankel倒置变换被模仿，它在对理论上的预言的好同意被显示出。模型为媒介的粘弹性的参数的决心提供一个有用工具。

简介：二维的热机械的数字模型显示出高密度的岩石圈的重力的移动可以生产的那Rayleigh-Taylor-type(RT)重要表面变丑(垂直偏转>1000m)在一个大陆人盘子的内部。外壳的力量和厚度的一个合理范围，与一个厚外壳从一个稳定的大陆人内部代表一个变化到热orogen，被检验响应RT不稳定性学习外壳的变丑和表面偏转。一般来说，表面偏转的三种类型在RT期间被观察滴下事件：(1)沉淀和否定地形学；(2)高举并且积极地形学；(3)沉淀列在后面由高举并且转换地形学。决定表面表示的一个关键因素是外壳的厚度。有一个薄外壳的模型主要显示出沉淀并且开发盆。在厚外壳模型，表面表达式是更可变的，取决于高密度的异例的外壳的力量和深度。与弱外壳和一个深高密度的异例，RT滴下是从overlying外壳的decoupled，并且表面展览高举或很少偏转，RT滴下导致收缩并且overlying外壳变厚。与一个强壮的外壳和浅异例，相反，表面更强烈被结合drip并且经历沉淀，列在后面由高举。

简介：Opticaltrappingtechniquesholdgreatinterestfortheiradvantagesthatenabledirecthandlingofnanoparticles.Inthiswork,westudytheopticaltrappingeffectsofadiffraction-limitedfocalfieldpossessinganarbitraryphotonicspinandproposeaconvenientmethodtomanipulatethemovementbehaviorofthetrappednanoparticles.Inordertoachievecontrollablespinaxisorientationandellipticityofthetightlyfocusedbeaminthreedimensions,anefficientmethodtoanalyticallycalculateandexperimentallygeneratecomplexopticalfieldsatthepupilplaneofahighnumericalaperturelensisdeveloped.BynumericallycalculatingtheopticalforcesandtorquesofRayleighparticleswithspherical/ellipsoidalshape,wedemonstratethattheinteractionsbetweenthetunablephotonicspinandnanoparticlesleadtonotonly3Dtrappingbutalsoprecisecontrolofthenanoparticles’movementsintermsofstableorientation,rotationalorientation,androtationfrequency.Thisversatiletrappingmethodmayopenupnewavenuesforopticaltrappingandtheirapplicationsinvariousscientificfields.

简介：Thesonarsystemswhichworkinshallowwaterenvironmentsuffergreatlyfrominfluencesofoceanicnoises,acousticpropagationseesawandmultipath.Withshallowwaterenvironmentandhigherrange-bearingresolutionofsonarsystems,therearenotenoughindependentscattererswithinaresolutioncellforthecentrallimittheoremtohold.Thereverberationenvelopeprobabilitydensityfunction(pdf)divergesfromRayleighpdf.Thenon-Rayleighpdfwithheaviertailsiscomplicated,anditisdifficulttoestimatethefunctionparametersaccuratelyinrealtime.WithCFAR(ConstantFalseAlarmRate)processingofthereverberationenvelopedata,whichattenuatestheheaviertailsdatavaluestotheestimatedbackgroundpowervalues,thedatareverberationistransformedfromnon-RayleighdistributiontoapproximatelyRayleighdistribution.Sinceitgetsridoftheinterferenceswhichaffecttheestimationofbackgroundpower,thedetectorcanestimatetheoceanicbackgroundpowerlevelmoreaccurately.Withtherationalestimationofbackgroundpowerlevel,theCFARdetectioncapabilityisbetterandrobust.Withprocessingofhighresolutionsonardata,itisshownthattheproposedalgorithmisefficient.

简介：ThisstudyconcernscalculationofphasedarraybeamfieldsofthenonlinearRayleighsurfacewavesbasedontheintegralsolutionsforanonparaxialwaveequation.SincetheparabolicapproximationmodelfordescribingthenonlinearRayleighwaveshascertainlimitationsinmodelingthesoundbeamfieldsofphasedarrays,amoregeneralmodelequationandintegralformsofquasilinearsolutionsareintroduced.SomefeaturesofsteeredandfocusedbeamGeldsradiatedfromalinearphasedarrayofthesecondharmonicRayleighwavearepresented.

简介：在分散图象的嗨精力乐队通常作为真分散阶段速度被解释。然而，瑞利的多重分散模式在空格在分层的媒介栈飘动，生产在分散图象的有效分散曲线和假multimode分散曲线。有效分散曲线把有更低的阶段速度的精力经常比假分散阶段速度，并且这样是的最大值作为基本模式误解了。在可容忍的不合身的衣服以内，有效分散曲线能接近真基本模式。与真multimode分散曲线不同，假multimode分散曲线与有效分散曲线有关。一个数字模特儿被适应模仿真分散曲线，有效分散曲线，和假multimode分散曲线。他们的差别和相互的关系被表明。

简介：InaCDMAcommunicationnetworkusingconventionalsignaldetection,systemcapacityislimitedanditsperformanceisdegradedbythemulti-accessinterference(MAI).Multiuserdetection,whichmakesuseofcross-correlationinformationbetweenspreadspectrumcodes,canreduceoreliminatetheMAIinaGaussianchannelsoastomitigatethenear-fareffectsandincreasethesystemcapacity.ThispaperextendsthemultiuserdetectortoaflatRayleighfadingCDMAenvironment,anddiscussesthebiterrorrateoftypicalmultiuserdetectionalgorithmsinsuchaenvironmentbycombiningtheoreticalanalysisandcomputersimulation.ItisshownthatmultiuserdetectionissuperiortoconventionaldetectionsintheflatRayleighfadingchannels.

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简介：Basedonthetheoryofmulticarrier(MC)techniqueandtheRakereceiver,amulticarrierDSCDMARakesystemisproposed,whereadatasequencemultipliedbyaspreadingsequencemodulatesmultiplecarriers.ThereceiverprovidesaRakeforeachsubcarrier,andtheoutputsoftheRakesarecombinedbyamaximal-ratiocombiner.Theaverageprobabilityoferrorofthesystemisderivedfromanuncorrelatedsubcarrierandfrequency-selectivefadingchannelmodel.ThesystemperformancesareevaluatedoverRayleighfadingchannelwithanexponentialmultipathintensityprofile(MIP)andwitharectangularMIP,respectively,whenmultipathinterferenceispresent.ItisfoundthatthiskindofmodelhaslargersuperiorityinanexponentialMIPthaninarectangularMIP.