简介：Basedonthetheoryofelasticdynamics,thescatteringofelasticwavesanddynamicstressconcentrationinfiber-reinforcedcompositewithinterfacesarestudied.Analyticalexpressionsofelasticwavesindifferentmediumareasarepresentedandananalyticmethodofsolvingthisproblemisestablished.Themodecoefficientsaredeterminedbymeansofthecontinuousconditionsofdisplacementandstressontheboundaryoftheinterfaces.Theinfluenceofmaterialpropertiesandstructuralsizeonthedynamicstresscon-centrationfactorsneartheinterfacesisanalyzed.Itindicatesthattheyhaveagreatinfluenceonthedynamicpropertiesoffiber-reinforcedcomposite.Asexamples,numericalresultsofdynamicstressconcentrationfac-torsneartheinterfacesarepresentedanddiscussed.Thispaperprovidesreliabletheoreticalevidenceforthestudyofdynamicpropertiesinfiber-reinforcedcomposite.

简介：有弹性的阻抗(EI)倒置广泛地在工业被使用了估计有点有弹性的参数区分岩性学或甚至液体。然而，常规三术语的有弹性的阻抗公式甚至与在地震数据的细微随机的噪音是不稳定的，这被发现，由于有弹性的参数的性恶的系数矩阵。我们介绍了二术语的Fatti有弹性的阻抗倒置方法，它比常规三术语的有弹性的阻抗倒置更柔韧、精确。在我们的方法，密度被忽略增加倒置矩阵的坚韧性。而且，P阻抗和S阻抗，对随机的噪音不太敏感，被转换而不是VP和V在常规三术语的有弹性的阻抗的S。使倒置更稳定，我们把K价值的范围定义为限制。这个方法能获得答应的合成测试主张与低SNR(信号噪音比率)结果地震数据。用在一个2D线数据的方法的申请，我们完成了，并且VP/VS节，完美地匹配钻的井，在水库预言显示方法的潜力。

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

简介：Ifthefrequencyoftheincidentsoundwavecoincideswithoneoftheeigenfrequenciesoftheunderwaterelasticcylinder,thecorre-spondingeigenvibrationwillbeexcitedbyincidentsoundwaveandstronglyreradiatesoundwavetowardssurrondingwater.Ithasbeenre-vealedbypreviousinvestigationsthattheamplitudeofbackscatteringsoundappearstobeminimumattheeigenfrequenciesoftheunderwatermetalliccylindersbecauseofthedestructiveinterferencebetweenreradiatedwaveoftheeigenvibrationandthegeometricalreflectedwavefromsurfaceofthecylinders.Inthispaper,anewphenomenonhasbeenrevealed.Theamplitudeofbackscatteringsoundappearstobemaximumattheeigenfrequenciesofacylindermadefromnonmetallicmaterialinwhichthevelocityofelastictransversewaveislessthanthesoundvelocityinwater.

简介：Thedynamicresponseofthenon-linearelasticsimplysupportedbeamsubjectedtoaxialforcesandtransverseperiodicloadisstudied.Melnikovmethodisusedtoconsiderthedynamicbehav-iorofthesystemwhosepost-bucklingpathissteady.Theeffectofthehigherordertermsinthecon-trollingequationistakenintoaccount.Itisfoundthatthefifth-ordertermshaveagreatinfluenceonthedynamicbehaviorofthesystem.Theresultshowsthatthereexisteitherhomoclinicorbitsorhete-roclinicorbitsinthesystem.Inthispaper,thecriticalvaluesofthesystementeringchaoticstatesaregiven.Thediagramofanexampleisshown.

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简介：我们在某些合理假设下面考虑有弹性的薄盘子的颤动。我们由哈密尔顿原则为这个模型导出非线性的方程。在为起始的数据的hyperbolicity上的条件下面，我们建立本地时间well-posedness为起始并且由Picard重复的边界值问题为解决方案策划，并且获得估计。

简介：ＡＮＡＬＹＳＩＳＯＦＳＴＡＢＩＬＩＴＹＯＮＥＬＡＳＴＩＣＰＬＡＴＥＳＷＩＴＨＩＮＩＴＩＡＬＩＭＰＥＲＦＥＣＴＩＯＮＳＸｕＫａｉｙｕ（徐凯宇）（ＲｅｃｅｉｖｅｄＯｃｔ．５．１９９４；ＣｏｍｍｕｎｉｃａｔｅｄＰａｉＬｉｚｈｏｕ）ＡＮＡＬＹＳＩＳＯＦＳＴＡ...

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简介：Withthehelpofthedeclinemethod,acomputer-aidedanalysisprogramofChristoffelequationisdes-cribedwhichmakesitpossibletocalculateelasticandviscousconstantsofcrystalspreciselyandeasily.TheelasticconstantsofLiNbO3andBi12GeO20crystalsarecalculatedwithanApple-ⅡcomputerandtheFortranprogramsuggested,andthecalculateddataarecomparedwiththevaluesachievedbyothers.

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简介：Thispapergivesallthetwo-dimensionalmembranemodelsobtainedfromformalasymptoticanalysisofthethree-dimensionalgeometricallyexactnonlinearmodelofathinelasticshellmadewithaSaintVenant-Kirchhoffmaterial.Therefore,theothermodelscanbequotedasflexuralnonlinearones.Theauthoralsogivestheformalequationssolvedbytheassociatedstresstensorandpointsoutthatonlyoneofthosemodelsleads,bylinearization,tothe“classical”linearlimitingmembranemodel,whosejuetificationhasalreadybeenestablishedbyaconvergencetheorem.

简介：WeproposeanapplicationoftheelasticneuralnetforringrecognitioninRICHdetectors.Themethodhasbeendevelopedtofindringsdistortedduetomisalignmentofdetectorsandcontaminatedbynoise.ThealgorithmwastestedonsimulateddataofCOMPASSRICH-1detector.Reconstructionefficiencyis99.95%fortripleLEPTOeventstaking5msperevent.

简介：这份报纸为形式u的有弹性的横梁方程调查边界价值问题“”(t)=q(t)f(t，u(t)u吗？？

简介：Thetransformationmethodtocontrolwaveshasreceivedwidespreadattentioninelectromagnetismandacoustics.However,thismachineryisnotdirectlyapplicabletothecontrolofelasticwaves,becauseithasbeenshownthattheNavier’sequationdoesnotusuallyretainitsformundercoordinatetransformation.Inthisletter,weprovetheforminvarianceoftheNavier’sequationundertheconformalmappingbasedontheHelmholtzdecompositionmethod.Theneededmaterialparametersareprovidedtomanipulateelasticwaves.Thevalidityofthisapproachisconfirmedbyanactivestealthdevicewhichcandisguisethesignalsourcebychangingitsposition.Experimentalverificationsandpotentialapplicationsmaybeexpectedinnondestructivetesting,structuralseismicdesignandotherfields.

简介：Wereportphotoelectronenergyspectraandangulardistributionsforionizationwithelasticscatteringinultrastronglaserfields.NoblegasspecieswithHartree–FockscatteringpotentialsshowareductioninelasticrescatteringwiththeincreasingenergyofultrastrongfieldsandwhentheLorentzdeflectionofthephotoelectronexceedsitswavefunctionspread.Therelativisticextensionofathree-steprecollisionmodeliswell-suitedtotheultrastrongintensityregime(>1017W∕cm2)thatliesbetweentraditionalstrongfieldsandextremerelativisticinteractions.

简介：Afinitedifference/boundaryintegralproceduretodeterminetheacousticreflectedpressurefromafluid-loadedbi-laminatedplateisdescribed.Thebi-laminateiscomposedofapiezoelectriclayerandanelasticlayerincontactwiththefluid,andisheldbyanacousticallyhardbaffle.Inthenumericalmodel,thefluidpressureatfluid/solidinterfaceisreplacedbyacontinuumofpointsourcesweightedbythenormalaccelerationoftheelasticplate,andthegoverningequationsystemissolvedinthesoliddomain.Withthenormalaccelerationfound,thereflectedpressureinthefluidisdeterminedbyanintegralexpressioninvolv-ingtheGreen’sfunction.Itisdemonstratedthatanappropriateappliedvoltagepotentialacrossthepiezoelec-triclayerhastheeffectofcancellingeitherthereflectedorscatteredpressureoftheplateatanychosenfieldpointsinthefluid.

简介：Analyticalsolutionsfortheelasticpropertiesofavarietyofbinarynanotubeswitharbitrarychiralityareobtainedthroughthestudyofsystematicmolecularmechanics.Thismolecularmechanicsmodelisfirstextendedtochiralbinarynanotubesbyintroducinganadditionaloutof-planeinversiontermintotheso-calledstick-spiralmodel,whichresultsfromthepolarbondsandthebucklingofbinarygraphiticcrystals.Theclosed-formexpressionsforthelongitudinalandcircumferentialYoung’smodulusandPoisson’sratioofchiralbinarynanotubesarederivedasfunctionsofthetubediameter.Theobtainedinversionforceconstantsarenegativeforalltypesofbinarynanotubes,andthepredictedtubestiffnessislowerthanthatbytheformerstick-spiralmodelwithoutconsiderationoftheinversionterm,reflectingthesofteningeffectofthebucklingontheelasticpropertiesofbinarynanotubes.Theobtainedpropertiesareshowntobecomparabletoavailabledensityfunctionaltheorycalculatedresultsandtobechiralityandsizesensitive.ThedevelopedmodelandexplicitsolutionsprovideasystematicunderstandingofthemechanicalperformanceofbinarynanotubesconsistingofIII–VandII–VIgroupelements.

简介：Thelongitudinaloscillationofanonlinearelasticrodwithlateralinertiawasstudied.Basedonthefarfieldandsimplewavetheory,anonlinearSchrodinger(NLS)equationwasestablishedundertheassumptionofsmallamplitudeandlongwavelength.ItisfoundthatthereareNLSenvelopsolitonsinthissystem.FinallythesolitonsolutionoftheNLSequationwaspresented.

简介：Thebehaviorofthestressintensityfactoratthetipsofcrackssubjectedtouniaxialtensionσχ^∞=pwithtraction-freeboundaryconditioninhalf-planeelasticityisinvestigated.Theproblemisformulatedintosingularintegralequationswiththedistributiondislocationfunctionasunknown.Intheformulation,wemakeusedofamodifiedcomplexpotential.Basedontheappropriatequadratureformulastogetherwithasuitablechoiceofcollocationpoints,thesingularintegralequationsarereducedtoasystemoflinearequationsfortheunknowncoefficients.Numericalexamplesshowthatthevaluesofthestressintensityfactorareinfluencedbythedistancefromthecrackstotheboundaryofthehalf-planeandtheconfigurationofthecracks.