简介：Weexperimentallydemonstratetwokindsofallfew-modefiber(FMF)ringlaserswithhigh-ordermode(HOM)oscillationinthelasercavity.Onekindisaswitchable-wavelengthall-FMFHOMlaserwithanoutputoftunableopticalvortexbeams(OVBs);theotherisaQ-switchedall-FMFHOMlaserwithanoutputofpulsedcylindricalvectorbeams(CVBs).Thelasersarecomposedofall-FMFcomponentsandfew-modeerbium-dopedfiber.ASagnacinterferometermadeofa3dBFMFcouplerfunctionsasthewavelengthselector,andswitchablemultiwavelengthtunableOVBsareexperimentallyrealized.Carbonnanotube-basedsaturableabsorbersandthenonlinearpolarizationrotationtechniqueareusedtoachieveQ-switchedCVBlasers.Thisisthefirstreport,toourknowledge,onthegenerationofswitchable-wavelengthandQ-switchedHOMbeamsinall-FMFlasercavities.

简介：AdeuteronpossessesacoulombpotentialbarrierwithmaximumUmax≈10^6eV(atro=1.51×10^-13cm)aroundhim.Soprerequisitetodirectcollideandexcitenuclearfusionreactionfortwodeuteronsistopenetratetoallofoppositebarrier.

简介：Thetransversevibrationofanaxiallymovingstringsupportedbyaviscoelasticfoundationisanalysedusingthecomplexmodalmethod.TheequationofmotionisdevelopedusingthegeneralizedHamiltonprinciple.Theexactclosed-formsolutionofeigenvaluesandeigenfunctionsareobtained.Thegoverningequationisrepresentedinacanonicalstatespaceformdefinedbytwomatrixdifferentialoperators,andtheeigenfunctionsandadjointeigenfunctionsareprovedtobeorthogonalwithrespecttoeachoperator.Thisorthogonalityisappliedsothattheresponsetoarbitraryexternalexcitationsandinitialconditionscanbeexpressedinmodalexpansion.Numericalexamplesarepresentedtovalidatetheproposedapproach.

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简介：模式跳是在buckling以后区域的不稳定性现象，它在平衡配置引起一个突然的变化并且因此是有害的组织。一个部分有弹性的基础的配置能直接导致模式从弄弯的阶段并且通过整个buckling以后区域联合。在模式跳上由于部分基础的配置联合效果的模式被调查并且示威了是决定模式跳的一个重要因素。由适当地选部分有弹性的基础为配置，模式跳能被避免。

简介：Thetimedomainparameteridentificationmethodofthefoundation-structureinteractionsystemispresented.Onthebasisofbuildingthecomputationmodeandthemotionequationofthefoundation-structureinteractionsystem,thesystemparameteridentificationmethodwasestablishedbyusingtheextendedKalmanfilter(EKF)techniqueandtakingtheunknownparametersinthesystemastheaugmentstatevariables.Andthetimeparameteridentificationprocessofthefoundation-structureinteractionsystemwasimplementedbyusingthedataofthelayerfoundation-storehouseinteractionsystemmodeltestonthelargevibrationplatform.Thecomputationresultshowsthattheestablishedparameteridentificationmethodcaninducegoodparameterestmation.

简介：ThepresentpaperinvestigatesthedynamicresponseoffiniteTimoshenkobeamsrestingonasixparameterfoundationsubjectedtoamovingload.ItisforthefirsttimethattheGalerkinmethodanditsconvergencearestudiedfortheresponseofaTimoshenkobeamsupportedbyanonlinearfoundation.ThenonlinearPasternakfoundationisassumedtobecubic.Therefore,theefectsofthesheardeformablebeamsandthesheardeformationoffoundationsareconsideredatthesametime.TheGalerkinmethodisutilizedfordiscretizingthenonlinearpartialdifferentialgoverningequationsoftheforcedvibration.ThedynamicresponsesofTimoshenkobeamsaredeterminedviathefourth-orderRunge–Kuttamethod.Moreover,theefectsofdiferenttruncationtermsonthedynamicresponsesofaTimoshenkobeamrestingonacomplexfoundationarediscussed.ThenumericalinvestigationsshowsthatthedynamicresponseofTimoshenkobeamssupportedbyelasticfoundationsneedssuperhigh-ordermodes.Furthermore,thesystemparametersarecomparedtodeterminethedependenceoftheconvergencesoftheGalerkinmethod.

简介：有在紧张和压缩的不同moduli的材料被称为双性人模量材料。Graphene是有最高的力量和最薄的厚度的如此的一种材料。在这份报纸，受到温度效果并且放了在Winkler地基上的双性人模量横梁的机械反应被学习。关于中立的轴位置和双性人模量基础横梁的正常紧张的未经决定的参数的微分方程被建立。然后，地基横梁的正常压力，弯曲时刻，和排水量的分析表情被导出。同时，一个计算过程基于有限元素方法(女性)被开发获得双性人模量结构的温度压力。获得的双性人模量解决方案能恢复古典模量解决方案，这被显示出，并且结果由分析表达式，现在的女性的过程，和传统的女性的软件获得是一致的，它验证现在的分析模型和过程的精确性和可靠性。最后，双性人模量结果之间的差别和古典一样的模量结果被讨论，并且为在实际工程计算并且优化某些双性人模量成员的几个合理建议被介绍。

简介：Inthispaper,thebendingproblemofrectangularthinplateswithfreeedgeslaidontensionlessWinklerfoundationhasbeensolvedbyemployingFourierserieswithsupplementaryterms.Byassumingproperformofseriesfordeflection,thebasicdifferentialequationwithgivenboundaryconditionscanbetransformedintoasetofinfinitealgebraicequations.Becausetheboundaryofcontactregioncannotbedeterminedinadvance.theseequationsareweaknonlinearones.Theycanbesolvedbyusingiterativeprocedures.

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简介：Anewfiniteelementmethod(FEM)ofB-splinewaveletontheinterval(BSWI)isproposed.ThroughanalyzingthescalingfunctionsofBSWIinonedimension,thebasicformulafor2DFEMofBSWIisdeduced.The2DFEMof7nodesand10nodesareconstructedbasedonthebasicformula.Usingtheseproposedelements,themultiscalenumericalmodelforfoundationsubjectedtoharmonicperiodicload,thefoundationmodelexcitedbyexternalandinternaldynamicloadarestudied.Theresultsshowtheproposedfiniteelementshavehigherprecisionthanthetraditionalelementswith4nodes.Theproposedfiniteelementscandescribethepropagationofstresswaveswellwheneverthefoundationmodelexcitedbyexternalorinternaldynamicload.Theproposedfiniteelementscanbealsousedtoconnectthemulti-scaleelements.Andtheproposedfiniteelementsalsohavehighprecisiontomakemulti-scaleanalysisforstructure.

简介：Wavepropagationanalysisforafunctionallygradednanobeamwithrectangularcross-sectionrestingonvisco-Pasternak'sfoundationisstudiedinthispaper.Timoshenko'sbeammodelandnonlocalelasticitytheoryareemployedforformulationoftheproblem.TheequationsofmotionarederivedusingHamilton'sprincipalsbycalculatingkineticenergy,strainenergyandworkduetoviscoelasticfoundation.Theeffectsofvariousparameterssuchaswavenumber,non-homogeneousindex,nonlocalparameterandthreeparametersoffoundationareperformedonthephasevelocityofthenanobeam.Theobtainedresultsindicatethatsomeparameterssuchasnon-homogeneousindex,nonlocalparameterandwavenumberhavesignificanteffectontheresponseofthesystem.

简介：Aschemeisdevelopedforanalysingtheinteractionbetweenafoundationandanonlin-earrockandsoilmedium,inwhichthefoundationisconsideredasalinearelasticbodyandatypicalboundaryintegralequationmethod(BIEM)isemployed.(hathebasisoftakingthenonlinearproper-tiesofthemediumintoaccount,aperturbationBIEMisdeveloped.Thefundamentalequationsforthenonlinearcouplinganalysisareformulated,andtypicalproblemsaresolvedanddiscussedbythepre-sentmethod.

简介：充满液体的机能上地分级的圆柱的壳的免费颤动特征隐居到有弹性的基础被一个分析方法调查。部分轴、尖的尺寸的有弹性的基础被Pasternak模型代表。壳的运动被代表由一阶砍说明旋转惯性的变丑理论并且横向砍紧张。机能上地分级的圆柱的壳由不锈钢和硅氮化物组成。材料性质以成分的体积部分根据幂定律分布通过厚度连续地变化。管理方程用RayleighRitz方法和一条变化途径被获得。液体被古典潜在的流动理论描述。数字例子被举并且与存在可得到的结果到相比验证现在的方法。充满液体的机能上地分级的圆柱的壳的免费颤动隐居到的图形的摘要有弹性的基础被一个分析方法调查。部分轴、尖的尺寸的有弹性的基础被Pasternak模型代表。壳运动被代表由一阶砍变丑理论。管理方程用RayleighRitz方法被获得。液体被古典潜在的流动理论描述。数字例子被举并且与存在可得到的结果到相比验证现在的方法。

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简介：Asaspecialgeologicalphenomenon,thecharacterofcollapsibleloessfoundationiscollapsiblewhenpenetratedbywater.Thischaracterleadstothesoillosingloadbearingcapacitylargelyandmayleadtofoundationfailure.Pileisapopularfoundationusedincollapsibleloess.Thesqueezedbranchandplatepileisanewtypeofpiledevelopedinrecentyearsandhasnotbeusedinaprojectbefore.Inthispaperthreesqueezedbranchandplatepilesaretestedincollapsibleloessafterimmersionprocessing.Theresultsmaybeusedforreferenceinsimilarconstructionproject,andtoprovidetheoreticalreferencesforde-signingofthesqueezedbranchandplatepilesinengineeringpractice.

简介：AnumberofdrybridgeshavebeenbuilttosubstitutefortheroadbedontheQinghai-TibetRailway,China.Theaimofthisstudywastoinvestigatetheexothermicprocessofcast-in-place(CIP)pilefoundationofadrybridgeanditsharmtothestabilityofnearbyfrozenground.Wepresent3Dheatconductionfunctionsofaconcretepileandoffrozengroundwithrelatedboundaries.Ouranalysisisbasedonthetheoryofheatconductionandtheexponentlawdescribingtheadiabatictemperaturerisecausedbyhydrationheat.ResultsundercontinuousandinitialconditionswerecombinedtoestablishafiniteelementmodelofaCIPpile-frozengroundsystemforadrybridgeunderactualfieldconditionsincoldregions.NumericalresultsindicatedthattheprocesscouldeffectivelysimulatetheexothermicprocessofCIPpilefoundation.ThermaldisturbancetofrozengroundunderalongdrybridgecausedbythecastingtemperatureandhydrationheatofCIPpileswassubstantialandlong-lasting.Thesimulatedthermalanalysisresultsagreedwithfieldmeasurementsandsomesignificantrulesrelatingtotheproblemwerededucedandconclusionsreached.

简介：作者在C上给围住的双线性的表格的Fourier变换的描述*(S1)×C*(二基础半的S2)以乔丹组织S1和S2*-representations,hemimogeneous随机域，并且象一样微弱地，harmonizable随机S回答1和S2直到Hilbert空格。