简介：Inthe'90sDEMsimulationresearchwassuccessfulinexploringitspotentialinthesimulationoffiuidizationphenomenaandinitsapplicationtothedesignoffluidized-bedprocesses.Nevertheless,notmuchprogresshasbeenmaderegardingtherealistictreatmentofcollisionprocessesthatarecriticalindeterminingmacroscopicmodeoffiuidization.Allthroughthesecondhalfofthe'90s,theauthorinvestigated/demonstratedtheissuebyintroducingdifferentsurfaceinteractionscausedbyformationofliquidand/orsolidbridges,vanderWaalsforceandtheexistenceofsurfaceroughness.Inthefirstpartofthepresentationthesearetobesummarizedandthetasksremainingarediscussed.Inthesecondpart,arepresentedtheresultsfromanewlydevelopedforce-deformationmetertodemonstratethesignificanceofthesurfaceroughnessanditselasto-plasticcharacteristics.

简介：Thispaperpresentsananalysisoftheactivecontrolofrandomvibrationforlaminatedcompositeplatesusingpiezoelectricfiberreinforcedcomposites(PFRC).WithHamilton’sprincipleandtheRayleigh-Ritzmethod,theequationofmotionfortheresultingelectromechanicalcouplingsystemisderived.Avelocityfeedbackcontrolruleisemployedtoobtainaneffectiveactivedampinginthesuppressionofrandomvibration.Thepowerspectraldensityandmeansquaredisplacementsoftherandomvibrationforlaminatedplatesunderdifferentcontrolgainsaresimulatedandthevalidityofthepresentcontrolstrategyisconfirmed.TheeffectofpiezoelectricfiberorientationinthePFRClayerontherandomvibrationsuppressionisalsoinvestigated.Theanalyticalmethodologycanbeexpandedtootherkindsofrandomvibration.

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简介：Inthispaper,weproposeaLotka-Volterraprey-predatorsystemwithdiscretedelaysandfeedbackcontrol.Firstly,weshowthatsolutionofthesystemisbounded.Secondly,weobtainsufficientconditionfortheglobalstabilityoftheuniquepositiveequilibriumtothesystem.

简介：分叉的反控制指由适当控制与特别需要的性质和地点创造某个分叉的任务。我们考虑，经由反馈控制和符号的计算，在混乱的刘系统的Hopf分叉的反控制的问题。我们建议一个反控制计划并且证明与不受管束的系统相比，控制反的刘系统能在一个大得多的参数区域展出Hopf分叉。使用的反控制策略保留刘系统和罐头的平衡结构被使用与比较喜欢的稳定性在需要的地点产生Hopf分叉。我们在不同操作条件下面说明反控制途径的效率。

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简介：Duetotheexistenceofspatialwalk-offand/orgroup-velocitymismatcheffects,pump-to-signalphasetransferbecomesinevitableduringparametricamplification.Weexperimentallydemonstratethatinhybridseededopticalparametricamplifiers(OPAs)thatincludetwoOPAstagesseededbythesignalandidlerwaves,respectively,thephaseoftheoutputsignalcanberestoredtoitsinitialvalue,althoughtherearespatialandtemporalphasefluctuationsonthepumpsource.Thismethodsignificantlyrelaxestherequirementforhighpumpbeamquality,whichisalwaysverystringentinparametricamplificationsystems.Withtheintroductionofthisschemeintobirefringentphase-matchingOPAsorchirped-pulseOPAs,itshouldbepromisingtoachieveintensefemtosecondlaserpulsesthatareclosetothediffractionlimitinspaceandultra-highcontrastintime,simultaneously.

简介：Thispaperproposesanultra-modifiedSSA(symmetricsequencealgorithm)ofspacevectormodulationofMC(matrixconverter).Theultra-modifiedtechniqueimprovesthedrawbacksofthemodifiedonewhereitprovidesareductionofthetotalharmonicdistortionforbothoutputvoltageandcurrent.AlsothispaperproposesamodifiedfeedforwardcontrolleroftheMCwithindirectspacevectormodulation.Themodifiedfeedforwardprovidesasolutionforthechangeintheoutputvoltageduetochangeinwindspeed,whereitprovidesaconstantoutputvoltagewithconstantfrequencyevenifthewindspeedchanged.SomeoftheadvantagesofMCareintroducedinthispaper.TheseadvantagesrepresentedintheoutputfrequencyofMCwhichmaybegreaterthantheinputfrequency,controllingrmsvalueoftheoutputvoltageandtheabilitytocontroltheIDF(inputdisplacementfactor).Attheendofthispapersimulationandexperimentalresultsareintroducedwhichgiveapreciseprooftotheproposedalgorithms.

简介：Theeffectivenessofafluid-loadedsandwichedviscoelasticlayerinsuppressingacousticscat-teringandradiationhasbeenestimatedusingtheThomson-Haskellmatrixmethod.TheGU(GaunaurdandUberall)resonancetheoryhasbeenadoptedtohandlethreetypesofviscoelasticsubstrateswithair-filledin-clusions.Theeffectsofthevaryingthicknessofthesubstrates,thevolumefractionsoftheinclusionsandfre-quenciesofincidentwaveshavebeenstubbedtodeterminetheoptimalstrategiesofsignalreduction.Intheinvestigation,themonopoleresonancephenomenaoftheinclusionshavebeentakenintoaccount.

简介：Thispaperpresentstheproblemofcontrolofanti-aircraftmissilelaunchermountedonamovingcarrier-vehicle.Directexcitationsonthevehiclefromtheroadcauseadversevibrationsofthelauncher.Inordertoincreasetheprecisionoftheguidingsystemintheconditionsofself-propelledmovementofthesetuponabumpyroad,theadaptivecontrolalgorithmwasproposed.Someresearchresultsofcomputersimulationarepresentedinagraphicalform.

简介：Inthisarticle,weestablishtheglobalstabilityofanendemicequilibriumofmulti-groupSIRepidemicmodels,whichhavenotonlyanexchangeofindividualsbetweenpatchesthroughmigrationbutalsocrosspatchinfectionbetweendifferentgroups.Asaresult,wepartiallygeneralizetherecentresultinthearticle[16].

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简介：Amain-chainliquidcrystallineionomer(MLCI)containingsulfonicgroupwassynthesizedbyaninterfacialcondensationreaction.TheMLCIwasblendedwithpolybutyleneterephthalate(PBT)andpolypropylene(PP).MLCIinteractedwithboththedispersed(PP)phaseandthematrix(PBT)phasetomodifytheinterfacialinteractionofPBTandPP.Differentialscanningcalorimetry(DSC),scanningelectronmicroscopy(SEM)andFTIRimagingsystemanalysisdemonstratedthesignificanceofinterfacialinteractioninthepolymerblends.MLCIbroughtaboutgoodadhesionattheinterfacial,whichreducedthedispersephasesizeandenabledafinePPphaseatmatrix.ThemechanicalpropertiesoftheternaryblendswereimprovedwhenaproperamountofMLCIwasadded.Thiswasattributedtoenhancedadhesionattheinterface,whichinvokedbettermechanicalpropertiesintheblends.

简介：Condensationofmethyl7-methylcoumarin-4-acetate(2)withprimaryaminesandwithan-thranilicacidgave7-methyl-2-oxo-N-aryl-2H-[1]-benzopyran-4--acetamide(4a—d)and(7),respectively.Compound7underwentcyclizationtogive2-(7-methyl-2-oxo-2H-[1]-benzopyran-4-yl)-methyl-4H-3,1-benzoxazin-4-one(3).Thereactionof3witharomaticaminesgavethecorrespondingquinazolonederivatives5whichtautomerisestothethermodynamicallymorestableisomer6,whereasitsreactionwithGrignardreagentsandaromaticaldehydesgave8a,8b,and9a,9b,respectively.

简介：Threenewpolysesquisiloxane-boundplatinumcomplexesweresynthesizedviahydrolysisofN,N-di(β-ethylmercaptoethyl)γ-(triethoxysilyl)propylamineorcohydrolysisofthemonomerwithdodecyltriethoxysilaneorwithphenylpropylthiethoxysilaneandimmobilixationonfumedsilica,followedbyreactingwithpotassiumplatiniteinacetoneunderargonatmosphere.Theplatinumcomplexesexhibitedhighcatalyticactivityforthehydrosilylationofolefinsbytriethoxysilane.Theeffectsoftemperatureandtheamountofcomplexonthecatalyticactivity,aswellastherecoveryandreusabilityofthecatalystswereinvestigated.

简介：通过吝啬地的近似，Gaussian近似，不安扩大，和一个3理论的地理论上的重正常化组分析的详细研究，我们证明不稳定性修理了理论的点，和他们的联系不稳定性代表，与可伸缩和一阶的阶段转变在一个地驱动的分级的4模型展出的普遍性行为相当可能相关，在它的批评温度和近的th下面放大并且领先修正到可伸缩的Finitetime被考虑。我们也证明一阶的阶段转变的不稳定性代表Yang庇护边奇特等价于那些，并且采用后者改进我们前者的估计。结果与存在数字结果同意很好。

简介：Graphene,definedasasingleatomicplaneofgraphite,isasemimetalwithasmalloverlapbetweenthevalenceandconductionbands.Thestackingofgrapheneuptoseveralatomiclayerscanleadtodiversephysicalproperties,dependingonthestackingmethod.Bilayergrapheneisalsoasemimetal,adoptingtheAB-stacked(orBernal-stacked)structureortherareAA-stackedstructure.Trilayerorfew-layergraphene(FLG)canbesemimetalsorsemiconductors,dependingonwhethertheyadoptBernal(ABA)stackingorrhoinbohedral(ABC)stacking.

简介：Inthepapertheproblemontheassignmentoftheboundsofdecreasingrateforatime-varyinglinearcontrolsystemisdiscussed.Thesufficientandnecessaryconditionforboundsofdecreasingrateofatime-varyinglinearsystemtobeassignedarbitrarilyispresented.Itispointedoutthatforanygivenrealnumbern,M,n