简介：Mostofthemaintenanceoptimizationmodelsincondition-basedmaintenance(CBM)considerthecost-optimalcriterion,butfewpapershavedealtwithavailabilitymaximizationformaintenanceapplications.AnoveloptimalBayesiancontrolapproachispresentedformaintenancedecisionmaking.Thesystemdeteriorationevolvesasathree-statecontinuoustimehiddensemi-Markovprocess.Consideringtheoptimalmaintenancepolicy,themultivariateBayesiancontrolschemebasedonthehiddensemi-Markovmodel(HSMM)isdeveloped,theobjectiveistomaximizethelong-runexpectedaverageavailabilityperunittime.Theproposedapproachcanoptimizethesamplingintervalandcontrollimitjointly.AcasestudyusingMarkovchainMonteCarlo(MCMC)simulationisprovidedandacomparisonwiththeBayesiancontrolschemebasedonhiddenMarkovmodel(HMM),theage-basedreplacementpolicy,Hotelling’sT2,multivariateexponentiallyweihtedmovingaverage(MEWMA)andmultivariatecumulativesum(MCUSUM)controlchartsisgiven,whichillustratestheeffectivenessoftheproposedmethod.

简介：Freespanningpipelinesaresuspendedbetweentwopointsonanunevenseafloor.Thevariationsofstructuralconditions,suchasthechangesinsoilproperty,flowvelocity,axialforceandspanlengthetc.,directlyaffectworkingperformanceofthewholesubmarinepipelinesystem.Butuntilnowfewresearcheshavefocusedonconditionidentificationforfreespan(CIFS).Amethodtoidentifytheoperationalconditionsoffreespanningsubmarinepipelinesbasedonvibrationmeasurementsisproposedinthispaper.Firstly,theill-posednessofCIFSisanalyzedindetail.Secondly,theframeworkforCIFSbasedonthenonlinearkerneldiscriminantanalysis(KDA)isestablished.Thirdly,theinternalstructuralcharacteristicsofnaturalfrequencies,normalizedfrequenciesandfrequencychangeratiosarestudied.AndthentheconditionfeaturevectorforCIFSisextractedbyuseofthevibrationmeasurements.Finally,thevalidityoftheproposedapproachisevaluatedbyacasestudy.Theresultsdemonstratethattheproposedapproachcaneffectivelyidentifyeachconditionoffreespanwhenconditionvariationoccursevenifundermeasurementnoise.ItisconcludedthattheproposedmethodisapromisingtoolforCIFSinrealapplications.

简介：Amethodofdetectingdry,icyandwetroadsurfaceconditionsbasedonscanningdetectionofsinglewavelengthbackwardpowerisproposedinthisletter.Thedetectorisusedtoreceivethebackwardscatteredpowerwhichchangeswiththeincidenceangle.Therelationshipbetweenbackwardpowerandincidenceangleisusedtofindouttheeffectiveanglerangeanddistinguishmethod.Experimentandsimulationshowthatitisfeasibletoclassifythesethreeconditionswithinincidenceangleof5.3degree.

简介：在常规波浪的轮船漂浮状况是计算的。漂浮的轮船调节的新方程控制任何东西被向量操作的使用建议。这种形式是能与经常的系数用惩罚功能方法被解决的一个非线性的优化问题。并且解决的过程被两分加速。在解决的过程期间，轮船排水量和快活的中心被轮船表面的集成根据吃水线计算了。轮船表面用一个积聚的弦长度理论被描述以便决定排水量，快活中心和吃水线。在每个车站形成吃水线的风能被计算轮船表面和波浪表面的交叉发现。一个例子的结果显示这个方法准确、有效。漂浮能计算轮船在常规波浪调节以及简化计算并且改进计算效率和结果的精确。

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简介：在这篇论文，我们显示出与透明边界条件散布问题的马的well-posedness和稳定性。证明取决于与也被建立的复杂波浪数字散布问题的时间泛音麦克斯韦的well-posedness。

简介：Thegeneralexpressionwiththephysicalsignificanceandpositive-definiteconditionoftheeigenvaluesof4×4Hermitianandtrace-onematrixareobtained.TheobviousexpressionofPeres'separabilityconditionforanarbitrarystateoftwoqubitsisthengivenanditsoperationalfeatureisenhanced.Furthermore,wediscusssomeapplicationstothecalculationoftheentanglement,theupperboundoftheentanglement,andamodelofthetransferofentanglementinaqubitchainwithnoise.

简介：现在的纸建议一个新自然弱条件代替thequasimonotone和O定期变化的伪单调条件，并且显示出主要结果的结论在[10]静止抓住。而且，我们证明任何O定期变化的伪单调条件暗示这个条件，这样tnequasimonotonicity的含糊的牵连能在实践被避免。

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简介：Inthispaper,weintroduceaconditionweakerthantheLpdifferentiability,whichwecallCpcondition.Weprovethatifafunctionsatisfiesthisconditionatapoint,thenthereexiststhebestlocalapproximationatthatpoint.WealsogiveanecessaryandsufficientconditionforthatafunctionbeLpdifferentiable.Inaddition,westudytheconvexityofthesetofclusterpointsofthenetofbestappoximationsoff,{Pe(f)}ase→0.

简介：TheHelmholtzequationissometimessupplementedbyconditionsthatincludethespecificationoftheboundaryvalueofthedivergenceoftheunknown.Inthispaper,westudythevectorHelmholtzproblemindomainsofbothC~(1,1)andLipschitz.Wees-tablisharigorousvariationalanalysissuchasequivalence,existenceanduniqueness.Andweproposefiniteelementapproximationsbasedontheuncoupledsolutions.Fi-nallywepresentaconvergenceanalysisanderrorestimates.

简介：1.IntroductionLetRbethecollectionofallrealnumbers,andZthecollectionofallintegers.Iff1(x)andf2(x)aretwofunctionsinL2(R),theinnerproductisgivenbyWesayf1(x)andf2(x)arebiorthogonal,ifFirstletusdescribeaclassoffunctions(x)and(2)inL2(R)asfollows.Thr...

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简介：ThispaperproposestheRiceconditionnumbersforinvariantsubspace,singularsubspacesofamatrixanddeflatingsubspacesofaregularmatrixpair.Thefirst-orderperturbationestimationsforthesesubspacesarederivedbyapplyingperturbationexpansionsoforthogonalprojectionoperators.

简介：在这篇文章，为克利福德的一个足够的条件继续部分会聚被建立，并且一些应用被给。

简介：Anovelfinite-difference(FD)approximationinfrequency-domainfortheMurboundaryconditionispresentedinthispaper.CombinedwiththeFDequationsderivedforinhomogeneousanisotropicmedia,thisboundaryconditionisconvenientandeffectivetobeappliedtotheEMscatteringbyelectricallylargeobjectsofcomplexmedia.Boththememoryrequirementandthecomputingtimearedramaticallysaved,comparedwiththeMM,withthecompressedstoragetechnique.Forthecasesofdifferentmedia,RCSofcircularandrectangularcylindersarecomputed.Goodagreementisobtainedbetweentheresultsbythismethodandthoseavailable.

简介：WeconsiderthenumericalsolutionfortheHelmholtzequationinR~2withmixedboundaryconditions.Thesolvabilityofthismixedboundaryvalueproblemisestab-lishedbytheboundaryintegralequationmethod.BasedontheGreenformula,weexpressthesolutionintermsoftheboundarydata.Thekeytothenumericalreal-izationofthismethodisthecomputationofweaklysingularintegrals.Numericalperformancesshowthevalidityandfeasibilityofourmethod.Thenumericalschemesproposedinthispaperhavebeenappliedintherealizationofprobemethodforinversescatteringproblems.