简介：在一份以前的报纸，一些特别multistep余弦方法被构造因为能线性地以一个稳定、明确的方法集成，它证明了很有效秒顺序的生硬问题及时。在现在的纸，为这种类型的一般方法的稳定性被给保证的条件，以及回声的彻底的研究并且为对称的过滤(它在另一份报纸，被证明了在Hamiltonian波浪方程关于invariants的保存很有益地表现)。这里被给的，是在提及的方面分析并且对待任何这种类型的方法的一个系统的方法。

简介：Metamaterialsareartificialcompositematerialsengineeredtohavepropertiesthatmaynotbefoundinnature.Byexploringlocallyresonanteffectofthebuildingunits,elasticmetamaterialsareabletopossessnegativevaluesofeffectivemass,effectivebulkorshearmodulus.Mass-springandcontinuummaterialversionsoftheseelasticmetamaterialsarereportedandthephysicalmechanismsofnegativeeffectiveparametersaredemonstrated.Applicationsofmetamaterialstoacousticcloakingandsuperlensingarealsodiscussed.

简介：Theinfluenceofairgapsontheresponseoftransmissionforatransverse-electricmodeparallel-platewaveguide(TE-PPWG)withasinglecavityanddoublecavitieshasbeenstudiedexperimentally.Astheairgapislargerthantheresonantwavelengthofhighordercavitymodeinthesingledeepgroovedwaveguide,onlythefundamentalcavitymodecanbeexcitedandsingleresonancecanbeobservedinthetransmissionspectrum.Basedonaboveobservations,atunablemultibandterahertz(THz)notchfilterhasbeenproposedandthevariationofairgaphasturnedouttobeaneffectivemethodtoselectthebandnumber.Experimentaldataandsimulatedresultsverifythisbandnumbertunability.Thismechanicalcontrolmechanismforelectromagneticinducedtransparency(EIT)willopenadoortodesignthetunableTHzdevices.

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简介：Wereportonthemodeling,simulation,andexperimentaldemonstrationofcompletemodecrossingsofFanoresonanceswithinchip-integratedmicroresonators.Thecontinuousreshapingofresonantlineshapesisachievedvianonlinearthermo-opticaltuningwhenthecavity-coupledopticalpumpispartiallyabsorbedbythematerial.Thelocallygeneratedheatthenproducesathermalfield,whichinfluencesthespatiallyoverlappingopticalmodes,allowingustoaltertherelativespectralseparationofresonances.Furthermore,weexploitsuchtunabilitytocontinuouslyprobethecouplingbetweendifferentfamiliesofquasi-degeneratemodesthatexhibitasymmetricFanointeractions.Asaparticularcase,wedemonstrateacompletedisappearanceofoneofthemodalfeaturesinthetransmissionspectrumaspredictedbyFano(Phys.Rev.124,1866(1961))Thephenomenonismodeledasathird-ordernonlinearitywithaspatialdistributionthatdependsonthestoredopticalfieldandthermaldiffusionwithintheresonator.Theperformednonlinearnumericalsimulationsareinexcellentagreementwiththeexperimentalresults,whichconfirmthevalidityofthedevelopedtheory.

简介：WestudyspectroscopicsignaturesofamonochromaticbosonmodeinteractingwithaT-shapedoublequantumdotcoupledbetweenthemetallicandsuperconductingleads.Focusingonaweakinterdotcoupling,wefindthattheproximityeffecttogetherwiththebosonicmodeareresponsiblefortheseriesofFano-typeresonancesappearingsimultaneouslyatnegativeandpositiveenergies.WeinvestigatetheseinterferometricfeaturesanddiscusstheirinfluenceonthesubgapAndreevconductancetakingintoaccountthecorrelationeffectsdrivenbytheCoulombrepulsion.

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简介：Thenonlinearnormalmodes(NNMs)associatedwithintegrnalresonancecanbeclassifiedintotwokinds:uncoupledandcoupled.ThebifurcationproblemofthecoupledNNMofsystemswith1:2:5dualinternalresonanceisintwovariables.ThesingularanalysisofitispresentedafterseparatingthetwovariablesbytakingadvantageofMaplealgebra,andsomenewbifurcationpatternsarefound.DifferentfromtheNNMsofsystemswithsingleinternalresonance,thenumberoftheNNMsofsystemswithdualinternalresonancemaybemoreorlessthanthenumberofthedegreesoffreedom.Atlast,itispointedoutthatbifurcationproblemsintwovariablescanbeconvenientlysolvedbyseparatingvariablesaswellasusingcouplingequations.

简介：Weinvestigatethediffractionoftheguidedmodesofadielectricslabwaveguideonasimpleintegratedstructureconsistingofasingledielectricridgeonthesurfaceofthewaveguide.Numericalsimulationsbasedonaperiodicrigorouscoupled-waveanalysisdemonstratetheexistenceofsharpresonantfeaturesandboundstatesinthecontinuum(BICs)inthereflectanceandtransmittancespectraoccurringattheobliqueincidenceofatransverseelectric(TE)-polarizedguidedmodeontheridge.Usingtheeffectiveindexmethod,weexplaintheresonancesbytheexcitationofcross-polarizedmodesoftheridge.FormationoftheBICsareconfirmedusingatheoreticalmodelbasedoncoupled-wavetheory.ThemodelsuggeststhattheBICsoccurduetothecouplingofquasi-TEandquasi-transverse-magneticmodesofthestructure.SimpleanalyticalexpressionsfortheangleofincidenceandtheridgewidthpredictingthelocationoftheBICsareobtained.Theexistenceofhigh-QresonancesandBICsenablesusingtheconsideredintegratedstructureforsensing,transformationofopticalsignals,andenhancingnonlinearlight–matterinteractions.DuetotheLorentzianlineshapeoftheresonancesneartheBICs,thestructureisalsopromisingforfilteringapplications.

简介：Theresonancesofparametricvibrationwithforcedvibrationisanalyzed,thebifurca-tionequationofthesystemisobtainedandthesinsularityanalysisismade.Someofthelawsandphe-nomenaarerevealed.Thetransitionvarietyandbifurcationdiagramofthephysicalparametricplanearegiven.Theresultscanbeusedinensinecrins.

简介：为了由于不同扬声器，的改变的特征在语音识别减少降级，感性的频率为扬声器正规化基于subglottal回声变弯的一个方法被建议。变弯的因素用在subglottis和元音的道之间的声学的联合从第二subglottal回声被提取。第二subglottal回声独立于讲话内容，它多于第三共振峰反映说话者特征。感性的最小的变化无失真的反应PMVDR系数被使正常化，它是更柔韧的并且比MFCC有更好的反噪音能力。规范的系数在训练的讲话模式和语音识别被使用。实验证明词错误评价，作为与由第三共振峰变弯的MFCC和光谱相比，在吵闹的环境分别地在干净语音识别分别地在4%和3%，并且在9%和5%减少。结果显示建议方法能在一个说话者无关的识别系统改进词识别精确性。

简介：Theinterferenceofopticallyinducedelectricandmagneticresonancesinhigh-refractive-indexdielectricnanoparticlesprovidesanewapproachtocontrolandshapethescatteringpatternsoflightinthefieldofnanophotonics.InthisLetter,wespectrallytunetheelectricandmagneticresonancesbyvaryingthegeometryofasingleisolatedleadtelluride(PbTe)dielectricnanocube.Then,weoverlaptheelectricdipoleresonanceandmagneticdipoleresonancetosuppressbackwardscatteringandenhanceforwardscatteringintheresonanceregion.Furthermore,abroadbandunidirectionalscatteringisachievedbystructuringthedielectricnanocuboidsasatrimerantenna.

简介：在这研究，当簇被用来设计由中央的和六外部heptamers组成的super-heptamer，金nanodisk在heptamer聚类取向。我们由勾略检验了电浆子和Fano回声的位置和运动光谱为各种各样的nanodisk尺寸的上层建筑的反应。在superradiant和nanodisk簇的subradiant电浆子回声模式之间的干扰的质量被发现强烈取决于结构的配置和环境媒介的折射索引。我们用nanodisk代替了中央heptamer并且由几何上改变nanodisk结构探查了Fano回声的位置。最后，学习结构的两个的电浆子反应上的绝缘的环境的效果数字地并且理论上被检验。到液体物质的存在的有限plasmonic结构的局部性的表面电浆子回声敏感被阴谋优点的线性数字调查并且出现。有限差别的时间域方法被用作一个数字工具调查结构的电浆子反应。

简介：Two-dimensionalmaterialsaregeneratinggreatinterestduetotheiruniqueelectricalandopticalproperties.Inparticular,transitionmetaldichalcogenidessuchasmolybdenumdisulfide(MoS2)areattractivematerialsduetotheexistenceofadirectbandgapinthemonolayerlimitthatcanbeusedtoenhancenonlinearopticalphenomena,suchasRamanspectroscopy.Here,wehaveinvestigatedfour-wavemixingprocessesinbulkMoS2usingamultiplexcoherentanti-StokesRamanspectroscopysetup.Theobservedfour-wavemixingsignalhasaresonanceatapproximately680nm,correspondingtotheenergyoftheAexcitonictransitionofMoS2.Thisresonancecanbeattributedtotheincreasedthird-ordernonlinearsusceptibilityatwavelengthsneartheexcitonictransition.ThisphenomenoncouldopenthepathtousingMoS2asasubstrateforenhancingfour-wavemixingprocessessuchascoherentanti-StokesRamanspectroscopy.

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简介：Wetheoreticallyinvestigatetheelectrontransmissionthroughaseven-layersemiconductorheterostructurewiththeDresselhausspin-orbitcouplingundertwoappliedoscillatingfields.Numericalresultsshowthatbothofthespin-dependentsymmetricBreit-WignerandtheasymmetricFanoresonancesappearandthatthepropertiesofthesetwotypesofresonancepeaksaredependentontheamplitudeandtherelativephasesofthetwoappliedoscillatingfields.Themodulationofthespin-polarizationefficiencyoftransmittedelectronsbytherelativephaseisalsodiscussed.

简介：Wepresentastudyofthenonlinearcouplinginternalresonancefortheheaverollandpitchperformanceofasparplatformunderthewaveandvortex-inducedloadswhentheratioofthefrequenciesofheave,rollandpitchareapproximately2:1:1.Inconsiderationofvaryingwetsurface,thethreeDOFsnonlinearcoupledequationsareestablishedforthesparplatformundertheeffectofthefirst-orderwaveloadsintheheaveandpitch,andvortexinducedloadsintheroll.Byutilizingthemethodofmulti-scaleswhenthevortex-inducedfrequencyisclosetothenaturalrollfrequency,thefirst-orderperturbationsolutionisobtainedanalyticallyandfurthervalidatedbythenumericalintegration.Sensitivityanalysisisperformedtounderstandtheinfluenceofthedampingandtheinternaldetuningparameter.Twocaseswithinternalresonanceareshown.Thefirstcaseisthatnosaturationphenomenonexistsundersmallvortex-inducedloads.Thefirstorderperturbationsolutionillustratesthatonlythevortex-inducedfrequencymotioninrollandthesuper-harmonicfrequencymotioninheaveareexcited.Thesecondcaseisthatthevortex-inducedloadsarelargeenoughtoexcitethepitchandasaturationphenomenonintheheavemodefollows.Theresultsshowthatthereisnosteadyresponseoccurrenceforsomecases.Forthesecaseschaosoccursandlargeamplitudesresponsecanbeinducedbythevortex-inducedexcitation.

简介：Thenonlinearbehaviorofacantileveredfluidconveyingpipesubjectedtoprincipalparametricandinternalresonancesisinvestigatedinthispaper.Theflowvelocityisdividedintoconstantandsinusoidaiparts.Thevelocityvalueoftheconstantpartissoadjustedsuchthatthesystemexhibits3:1internalresonancesforthefirsttwomodes.Themethodofmultiplescalesisemployedtoobtaintheresponseofthesystemandasetoffourfirst-ordernonlinearordinary-differentialequationsforgoverningtheamplitudeoftheresponse.TheeigenvaluesoftheJacobianmatrixareusedtoassessthestabilityoftheequilibriumsolutionswithvaryingparameters.Thecodimension2derivedfromthedouble-zeroeigenvaiuesisanalyzedindetail.Theresultsshowthattheresponseamplitudemayundergosaddle-node,pitchfork,Hopf,homoclinicloopandperiod-doublingbifurcationsdependingonthefrequencyandamplitudeofthesinusoidalflow.Whenthefrequencyofthesinusoidalflowequalsexactlyhalfofthefirst-modefrequency,thesystemhasaroutetochaosbyperiod-doublingbifurcationandthenreturnstoaperiodicmotionastheamplitudeofthesinusoidalflowincreases.