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简介：Regimeswitching,whichisdescribedbyaMarkovchain,isintroducedinaMarkovcopulamodel.Weprovethatthemarginals(X,H~i),i=1,2,3oftheMarkovcopulamodel(X,H)arestillMarkovprocessesandhavemartingaleproperty.Inthisproposedmodel,apricingformulaofcreditdefaultswap(CDS)withbilateralcounterpartyriskisderived.更多还原

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简介：Theessenceofthelinearsearchisone-dimensionnonlinearminimizationproblem,whichisanimportantpartofthemulti-nonlinearoptimization,itwillbespendthemostofoperationcountforsolvingoptimizationproblem.Toimprovetheefficiency,wesetaboutfromquadraticinterpolation,combinetheadvantageofthequadraticconvergencerateofNewton'smethodandadopttheideaofAnderson-Bjorckextrapolation,thenwepresentarapidlyconvergencealgorithmandgiveitscorrespondingconvergenceconclusions.Finallywedidthenumericalexperimentswiththesomewell-knowntestfunctionsforoptimizationandtheapplicationtestoftheANNlearningexamples.Theexperimentresultsshowedthevalidityofthealgorithm.

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简介：我们获得并且适用几乎复杂的结构的integrability条件的一种简单形式到Hopfmanifolds。

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简介：MostalgorithmsoftheimmersedboundarymethodoriginatedbyPeskinareexplicitwhenitcomestothecomputationoftheelasticforcesexertedbytheimmersedboundarytothefluid.Adrawbackofsuchanexplicitapproachisasevererestrictiononthetimestepsizeformaintainingnumericalstability.AnimplicitimmersedboundarymethodintwodimensionsusingthelatticeBoltzmannapproachhasbeenproposed.Thispaperreportsanextensionofthemethodtothreedimensionsanditsapplicationtosimul...

简介：追踪的正电子排放粒子(PEPT)技术广泛地在科学和工程被使用了例如，在多相的系统在运动和液体或小粒的材料的流动领域上获得详细信息在岩石裂缝，化学反应堆和食品加工器的液体；在化学反应堆，granulators，混合器，干衣机，旋转火炉和球工厂的小粒的材料的动态行为。PEPT技术获得的信息能被用来优化设计，并且评估建模，为大量工业过程系统的运作的条件工作。这种技术基于由检测对追踪放射性地标记的粒子(多达三个粒子)紧接511条keV光线从射出的正电子的歼灭产生。它因此包含一个正电子照相机，为计算tracer地点和速度的地点算法，和把技术标记的tracer。这份报纸将考察从追踪算法追踪技术的粒子，标记到他们的申请的tracer。

简介：Afamilyofclosedsnbalgebras,indexedbyR(thesetofrealnumbers),oftheWickalgebraisconstructed.Fundamentalpropertiesoftilefamilyareshownincludingtheincreasingpropertyandtheright-continuity.Thenotionofadaptednesstothefamilyisdefinedforquantumstochasticprocessesintermsofgeneralizedoperators.Theexistenceanduniquenessofsolutionsadaptedtothefamilyisestablishedforquantumstochasticdifferentialequationsintermsofgeneralizedoperators.

简介：Existenceofsolutionsforsemiboundednonlinearevolutionequationsisestablished.Thisgivesmoreaccurateestimateofsolutionsandconditionsofexistenceaxemoreeasilyvalidated.OurresultsaresuccessfullyappliedtoproveexistenceanduniquenessofsolutionsforsomeKdVtypeequations.

简介：Usingarecentresultregardingthefixedpointsofmultivaluedmappings,theexistenceofinvariantbestsimultaneousapproximationinchainablemetricspaceisproved.

简介：Onthebasesofhightemperaturecreepexperiments,theresearchonengineeringapplicationofrheologicalformingiscarriedoutontwokindsoflightmetalalloypartsnamedcylindricalshellofLc4aluminumalloyandvanediskwithcomplexcurvedsurfaceofTC11titaniumalloy.Moreover,themechanicalpropertytestsunderroomandhightemperaturesfortheworkpiecesproducedbythisnewtechniquearealsodone,theresultsshowedthattheyaremuchimprovedevidentlycomparedwiththoseproducedbytraditionalmethod.

简介：Letf（x）∈Lp[0,1],00.Denote|f|Λρα=[0,1-kh],k=[α]+1}.If|f|Λρα<∞,wesaythatf∈ΛραYu.A.BrudnyirecentlyestablishedanewinequalityofBer-nsteintypeforrationalfunctions.DenotingRntheclassofrationalfunctionsofdegreen,hegaveTheoremAIfrn∈Rnandp=（α+（1/q））-1with1≦q≦∞,α>0,then

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简介：Multipaction,causedbythesecondaryelectronemissionphenomenon,hasbeenachallengeinspaceapplicationsduetotheresultingdegradationofsystemperformanceaswellasthereductionintheservicelifeofhighpowercomponents.Inthispaperwereportanovelapproachtorealizeaneffectiveincreaseinthemultipactionthresholdbyemployingmicro-poroussurfaces.Twomicro-porousstructures,i.e.,aregularmicro-porousarrayfabricatedbyphotolithographypatternprocessingandanirregularmicro-porousarrayfabricatedbyadirectchemicaletchingtechnique,areproposedforsuppressingthesecondaryelectronyield(SEY)andmultipactionincomponents,andthebenefitsarevalidatedboththeoreticallyandexperimentally.Thesesurfaceprocessingtechnologiesarecompatiblewiththemetalplatingprocess,andoffersubstantialflexibilityandaccuracyintopologydesign.Thesuppressioneffectisquantifiedforthefirsttimethroughtheproperfittingofthesurfacemorphologyandthecorrespondingsecondaryemissionproperties.Insertionlosseswhenusingthesestructuresdecreasedramaticallycomparedwithregularmillimeter-scalestructuresonhighpowerdielectricwindows.SEYtestsonsamplesshowthatthemaximumyieldofAg-platedsamplesisreducedfrom2.17to1.58fordirectlychemicaletchedsamples.MultipactiontestingofactualC-bandimpedancetransformersshowsthatthedischargethresholdsoftheprocessedcomponentsincreasefrom2100Wto5500Wforphotolithographypatternprocessingand7200Wfordirectchemicaletching,respectively.Insertionlossesincreasefrom0.13dBtoonly0.15dBforbothsurfacetreatmentsinthetransmissionband.Theexperimentalresultsagreewellwiththesimulationresults,whichoffersgreatpotentialinthequantitativeanti-multipactiondesignofhighpowermicrowavecomponentsforspaceapplications.

简介：Nonlineardynamicresponseofnanomechanicalresonatorisofveryimportantcharacteristicsinitsapplication.Twocategoriesofthetension-dominantandcurvature-dominantnonlinearitiesareanalyzed.Thedynamicnonlinearityoffourbeamstructuresofnanomechanicalresonatorisquantitativelystudiedviaadimensionalanalysisapproach.Thedimensionalanalysisshowsthatforthenanomechanicalresonatoroftension-dominantnonlinearity,itsdynamicnonlinearitydecreasesmonotonicallywithincreasingaxialloadingandincreasesmonotonicallywiththeincreasingaspectratiooflengthtothickness;thedynamicnonlinearitycanonlyresultinthehardeningeffects.However,forthenanomechanicalresonatorofthecurvature-dominantnonlinearity,itsdynamicnonlinearityisonlydependentonaxialloading.Comparedwiththetension-dominantnonlinearity,thecurvature-dominantnonlinearityincreasesmonotonicallywithincreasingaxialloading;itsdynamicnonlinearitycanresultinbothhardeningandsofteningeffects.Theanalysisonthedynamicnonlinearitycanbeveryhelpfultothetuningapplicationofthenanomechanicalresonator.

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简介：BeamalignmentdependsonCCDreal-timeimageanalysisandprocessing.Inordertoimprovethequalityofthealignment,multiplefiltersareusedinfar-fieldandnear-fieldimageprocessings.Thesemultiplefiltersareconstitutedofanaveragefilterandamedianfilterindifferentconnectionsequences,sothattheycandealwithdifferentkindsofnoise.Toreducetheeffectoftheunknownnonlinearrelationshipbetweenmotorrunningstepsanddeviationpixels,afeasiblemethodologyisofferedtoimprovethisphenomenonandafuzzyalgorithmisappliedtothemotorfeedbackcontrolprocess.Becauseofthefuzzycontrolitisnotnecessarytoestablishanaccuratemathematicalmodel,sotheimpactofthenonlinearrelationshipwillbereduced.

简介：TheK2Ti4O9whiskerswerechosenforthecatalystcarrier,TiO2/potassiumtitanatephotocatalystwaspreparedbySol-gelmethod.TheproductwascharacteratedbyX-raydiffractionandSEM.EDSshowsthat,themainpeckincludedTi,O,andKinpotassiumtitanatewhisker.ThemainpeakofKdisappearedandthepeaksofTi,Ostayedafterwhiskerwascovered.ItdirectedthatthesurfaceofsamplewascoveredbyTiO2.XRDshowsthatdiffractionpeakappeared,whichwascorrespondedtothepeakofanataseTiO2.Inthereactiondeviceofphotochemistry,usingmiddle-pressuremercurylampasillumination,rhodamineBassimulantpollutant,thephotocatalyticperformanceofTiO2/potassiumtitanatewasstudied.Underthesameconditions,thelowerpH,thelargerilluminance,thehighertemperature,thegreateraerationquantumandthelowerinitialconcentrationofrhodamineB,thehigherdecolorationratewasgot.Underourexperimentconditions:pH6,theilluminanceof250W,thetemperatureof313K,andtheaerationquantumof2.0L/min.WhentheconcentrationofrhodamineBwas8mg/LThephotocatalystofTiO2/potassiumtitanatewas0.01g/L.ThedecolorationrateofTiO2/potassiumtitanatedealtwiththerhodamineBreachover95%in160min,andcomparewithTiO2,thedecolorationrateofrhodamineBwasimproved0.50~1.91multiple.TiO2/potassiumtitanatecanbeusedtotreatmentofdyewastewater.