简介：Longshorecurrentinstabilityisimportanttonearshorehydrodynamicandsedimenttransport.Thispaperinvestigatesthelongshorecurrentinstabilitygrowthmodelbasedexperimentaldatawithdifferentvelocityprofilesofslopes1:100and1:40byadoptingalinearshearinstabilitymodelwiththebottomfrictioneffects.Theresultsshowthat:(1)Onlybackshearmodeexistsintheinstabilityoflongshorecurrentforslope1:40andfrontshearandbackshearmodesmayexistslope1:100.(2)Thepeaksoflinearinstabilitygrowthmodeforslope1:100correspondtothreecases:thedominantpeakisformedbythejointactionofbothfrontshearandbackshear,orbybackshearalonewithouttheexistenceofthesmallerpeakorformedbyeitherthefrontshearorbackshear.(3)Bottomfrictioncandecreasethecorrespondingunstablegrowthratebutitcannotchangetheunstablefluctuationperiod.Theresultsoffluctuationperiod,wavelengthandspatialvariationobtainedbytheanalysisoflinearshearinstabilityareingoodagreementwithexperimentalresults.

简介：Thelinearandnonlineardynamicresponsesofavibratoryringgyroscopeareinvestigatedinthisstudyfocusingontheresponsemechanismofsuchavibratorygyroscope.Itisfoundthatthenonlinearequationsgoverningthedriveandsensedirectionsarecoupledthroughbothinertiallinearandgeometricnonlinearterms.Nonlinearresponsesarestudiedbasedonthefullcouplednonlineardynamicequations.Thevaryingamplitudeonthesensedirectionisanalyzedfordifferentinputangularrates.Theeffectofnonlinearityontheringgyroscopesystemisperformedbycomparingtheresultsofnonlinearresponsestothoseoflinearresponses.Thecontributionsofsomeparameterstotheamplituderesponsesandgyroscopesensitivityareanalyzed,theconclusionsofwhichprovideguidelinestoimprovethesensitivityofthevibratoryringgyroscopes.

简介：Thispaperdealswithestimationandtestproceduresforrestrictedlinearerrors-invariables(EV)modelswithnonignorablemissingcovariates.Wedeveloparestrictedweightedcorrectedleastsquares(WCLS)estimatorbasedonthepropensityscore,whichisfittedbyanexponentiallytiltedlikelihoodmethod.Thelimitingdistributionsoftheproposedestimatorsarediscussedwhentiltedparameterisknownorunknown.Totestthevalidityoftheconstraints,weconstructtwotestproceduresbasedoncorrectedresidualsumofsquaresandempiricallikelihoodmethodandderivetheirasymptoticproperties.Numericalstudiesareconductedtoexaminethefinitesampleperformanceofourproposedmethods.

简介：这份报纸在凹面上为Steklov特征值问题涉及有限元素近似多角形的领域。我们充分利用整齐估计和nonconformingCrouzeix-Raviart元素的边一般水准插值操作员的特征，并且在||证明新、最佳的错误估计?????軱??$

简介：Thispaperfirstproposesanewapproachforpredictingthenonlinearwavetroughdistributionsbyutilizingatransformedlinearsimulationmethod.ThelinearsimulationmethodistransformedbasedonaHermitetransformationmodelwherethetransformationischosentobeamonotoniccubicpolynomialandcalibratedsuchthatthefirstfourmomentsofthetransformedmodelmatchthemomentsofthetrueprocess.TheproposednewapproachisappliedforcalculatingthewavetroughdistributionsofanonlinearseastatewiththesurfaceelevationdatameasuredatthecoastofYuraintheJapanSea,anditsaccuracyandefficiencyareconvincinglyvalidatedbycomparisonswiththeresultsfromtwotheoreticaldistributionmodels,fromalinearsimulationmodelandasecondordernonlinearsimulationmodel.Finally,itisfurtherdemonstratedinthispaperthatthenewapproachcanbeappliedtoallthesituationscharacterizedbysimilarnondimensionalspectrum.

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简介：Adual-ratepreviewcontrolstrategyforatypeofdiscrete-timesystemisproposedbasedonthetheoryofmultiratecontrol.First,byusingthediscreteliftingtechnique,thegeneraldual-ratediscrete-timesystemisconvertedintoasingle-rateaugmentedsystem.Onthisbasis,theaugmentederrorsystemisconstructedbyintroducingafirst-orderdifferenceoperatorandthepreviewablereferencesignal.Thenthetrackingproblemistransformedintoaregulatorproblemoftheaugmentederrorsystem.Theoptimalpreviewcontrollawoftheaugmentederrorsystemisobtainedbyusingstandardlinearquadraticoptimalpreviewcontroltheory,andthentheoptimalpreviewcontrolleroftheoriginalsystemisderived.Inaddition,thenecessaryandsufficientconditionsforthecontrolleraregiven.Finally,simulationresultsshowtheeffectivenessoftheproposedmethod.

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简介：Sesquiterpene内酯在他们的特殊结构和活动的优点在Kudiezi注射被看作主要活跃混合物。此处，一个分析方法为用结合的高效的液体层析的在Kudiezi注射的快速的屏蔽和sesquiterpene内酯的鉴定被开发在否定离子模式的线性离子trap-orbitrap团spectrometry(HPLC-LTQ-Orbitrap)。首先，二个sesquiterpene内酯参考标准被分析获得他们的典型ESI-MS/MS破碎模式。第二，基于提取离子层析(EIC)数据挖掘方法和典型破碎小径分析，在Kudiezi注射的sesquiterpene内酯很快被屏蔽并且识别。最后，一个重要参数堵塞P被采用区别sesquiterpene内酯的异构体。作为结果，50sesquiterpene内酯被描绘，包括9sesquiterpene内酯aglycones，39sesquiterpene内酯glycosides，和2氨基的acid-sesquiterpene内酯结合。在他们之中，13混合物尝试性地作为新混合物被识别。结果证明确定的方法将是为在自然的药的复杂系统屏蔽和sesquiterpene内酯的鉴定的一个快速的、有效分析工具。