简介：Inthispaper,adiscrete-timeanalysisofthethird-ordercharge-pumpbasedphase-lockedloops(CPLLs)ispresentedinthepresenceofloopdelay.Thez-domainanalysisoftheclosed-looptransferfunctionisderivedandcomparedwiththetraditionals-domainmethod.ThesimulationresultsunderSPECTREshowthat,duetothesamplingnatureofCPLL,thetraditionals-domainanalysisisunabletopredictitsjitterpeakingaccurately,especiallywhentheloopdelayistakenintoconsideration.Theimpactofloopdelayonthestabilityofthethird-orderCPLLsystemisfurtheranalyzedbasedontheproposedway.ThestabilitylimitofthewidebandwidthCPLLwithloopdelayiscalculated.Thecircuitsimulationresultsagreewellwithmathematicalanalysis.

简介：TheimplementationofJapanesepost-warpoliciestowardsChinahasbeenthroughagraduallyshiftingprocess,chronologicallygoingfrompoliciesofanti-Chinasentiment,friendlycooperationandacombinationofcautionandcooperation.UnderthecontextoftheseadjustingpoliciestowardsChina,thenationalpoliticalenvironmentandtheAmericanpowerofdiscoursehavebothsignificantlyaffectedJapaneseauthorities.Atthesametime,commoneconomicinterestandcautionconcerningChina’scompetitivenesshavealwaysbeenastableconsideration.

简介：Beampositioningstabilityinalaser-driveninertialconfinementfusion(ICF)facilityisavitalproblemthatneedstobefixed.Eachlaserbeaminthefacilityistransmittedinlotsofopticsforhundredsofmeters,andthentargetedinamicro-sizedpellettorealizecontrollablefusion.Anyturbulenceintheenvironmentinsuchlong-distancepropagationwouldaffectthedisplacementofopticsandfurtherresultinbeamfocusingandpositioningerrors.Thisstudyconcludedthattheerrorsoneachoftheopticscontributedtothetarget,anditpresentsanefficientmethodofenhancingthebeamstabilitybyeliminatingerrorsonerror-sensitiveoptics.Optimizationsoftheopticalsystemandmechanicalsupportingstructuresarealsopresented.

简介：Inthisarticle,bysolvinganonlineardifferentialequation,weprovetheexistenceofaoneparameterfamilyofconstantmeancurvaturehypersurfacesinthehyperbolicspacewithtwoends.Then,westudythestabilityofthesehypersurfaces.

简介：Weprovetheexistenceandtheorbitalstabilityofstandingwavesforthenonau-tonomousSchrdingersystemiut+ua(x)u+(|u|2p+b(x)|u|p-1|v|p+1)u=0,x∈RN,ivt+va(x)v+|v|2p+b(x)|v|p-1|u|p+1v=0,x∈RNundersuitableconditionsonthecoefficientfunctionsaandb.Wefollowtheideaofanalyzingthecompactnessofminimizingsequenceoftheconstrainedminimizationproblems.

简介：Inthispaper,westudysymmetryreductionforabinaryasteroidsystemmodeledbyarigidbodyandaparticle.Inparticular,wedemonstratehowtranslationalandrotationalsymmetryreductionappearedinthebinaryasteroidsystemcanbecarriedoutinthecontextofDiracreductionbystagesandwiththeassociatedreductionofimplicitHamiltoniansystems.Thenweinvestigatestabilityofrelativeequilibriaoftheasteroidpairandshowstabilityregionsbyusingtheenergy-momentummethod.Lastly,weillustratesomenumericalsimulationsforstableandunstableorbitsnearfromrelativeequilibriaoftheCollinearandTconfigurations.

简介：在这份报纸，为在3D的不可压缩的海军司烧方程围住的nonhomogeneous或无界的领域的大答案的全球L2稳定性的问题被学习。由精细的精力估计并且在大解决方案的合适的条件下面，它证明如果起始的数据是已知的强壮的解决方案的那些上的小不安，大解决方案是稳定的。

简介：Inthiscontribution,insideturningofathin-walledcylinderisinvestigatedinsimulation.Self-excitedvibrationscanariseduetorepeatedcuttingofthesamesurface,thatleadtoinstability.Aflexiblemultibodysystemmodelofthesystemisthebasisforasubsequentanalysisofthestabilityoftheprocess.Stabilityanalysisisdoneusinganapproximationasatime-discretesystemviathesemi-discretizationmethod.Anadaptronicturningchiselcomprisingapiezoactuatorandsensorsisthenusedincombinationwithdifferentcontrolconceptstoimprovethestabilityoftheprocess.Theeffectivenessofthedifferentstrategiesiscomparedbasedontheinfluenceonthestabilitycharts.AclassicH∞controllerbasedonamodelofthecoupledsystemofworkpieceandtoolcanonlyyieldsomeimprovements,whenanadditionalmeasurementoftheworkpiecedisplacementisadded.IncorporatingknowledgeonthecuttingprocesscouplingworkpieceandtoolusingagainscheduledH∞controllerallowsfurtherimprovements.However,robustnesswithrespecttomodeluncertainties,notablyconcerningtheforcelaw,remainsanissue.

简介：Biodiesel(fattyacidalkylesters),analternatetofossilfuel,hasthetendencyofautoxidationandhencerequiresantioxidantsforlongtermstorage.TheinfluenceofsyntheticandnaturalantioxidantsontheoxidativestabilitywasanalysedforfreshFAMEs(fattyacidmethylesters)obtainedfromheveabrasiliensisat140C.HigheractivitywasobservedforsyntheticantioxidantsfollowingtheorderofGA>BHT>DTBP>Q>GT-M>PH-M>GT-C,whereastheoxidativestabilityofstoredFAMEssamplesmeasuredat110Crevealsanearlyinversetrend.StoragestabilitywastestedfortheFAMEsobtainedfromheveabrasiliensisstoredat30C,afteradditionofsyntheticandnaturalantioxidants—butylatedhydroxytoluene(BHT),2,6-di-tert-butylphenol(DTBP),quercetin(Q),gallicacid(GA),methanolextractsfromgreentea(GTM),pomegranatehull(PH-M),andchloroformextractofgreentea(GT-C).Antioxidantactivitiesabove1500ppmwasintheorderofDTBP>BHT>GA>GT-C>GT-M>Q>PH-M.SyntheticantioxidantshavebeenfoundmoreefficienttoimprovethestoragestabilityofFAMEsobtainedfromheveabrasiliensis.DTBPinparticularhasthehighestprotectionfactor.

简介：Theaimofthispaperistostudythepracticalф0-stabilityinprobability(Pф0SiP)andpracticalф0-stabilityinpthmean(Pф0SpM)ofswitchedstochasticnonlinearsystems.Sufficientconditionsonsuchpracticalpropertiesareobtainedbyusingthecomparisonprincipleandthecone-valuedLyapunovfunctionmethods.Also,basedonanextendedcomparisonprinciple,aperturbationtheoryofswitchedstochasticsystemsisgiven.

简介：Inthispaper,weconstructacompositeMilsteinmethodfornonlinearstochasticdifferentialdelayequations.ThenweanalyzethemeansquarestabilityforthismethodandobtainthestepsizeconditionunderwhichthecompositeMilsteinmethodismeansquarestable.Moreover,wegetthestepsizeconditionunderwhichthecompositeMilsteinmethodisglobalmeansquarestable.Anonlinearteststochasticdifferentialdelayequationisgivenfornumericaltests.Theresultsofnumericaltestsverifythetheoreticalresultsproposed.

简介：Themicrostructuralevolutionsofadvanced9-12%Crferrite/martensiteheat-resistantsteelsusedforpowergenerationplantsarereviewedinthisarticle.Despiteofthesmalldifferencesinchemicalcompositions,thesteelssharethesamemicrostructureoftheas-temperedmartensite.Itisthethermalstabilityoftheinitialmicrostructurethatmattersthecreepbehavioroftheseheat-resistantsteels.Themicrostructuralevolutionsinvolvedin9-12%Crferriteheat-resistantsteelsareelabo-rated,including（1）martensiticlathwidening,（2）disappearanceofprioraustenitegrainboundary,（3）emergenceofsubgrains,（4）coarseningofprecipitates,and（5）formationofnewprecipitates,suchasLaves-phaseandZ-phase.Theformerthreemicrostructuralevolutionscouldberetardedbyproperlydisposingthelattertwo.Namelyimprovingthestabilityofprecipitatesandoptimizingtheirsizedistributioncaneffectivelyexertthebeneficialinfluenceofprecipitatesonmicrostructures.Inthissense,themicrostructuralstabilityofthetemperedmartensiteisinfactthestabilityofprecipitatesduringthecreep.Manyattemptshavebeencarriedouttoimprovethemicrostructuralstabilityof9-12%Crsteelsandseveralpromisingheat-resistantsteelshavebeendeveloped.

简介：Inthispaper,weintroducetwohybriditerativealgorithmsofJungck-Kirk-Mann(J-K-M)andJungck-Kirk(J-K)typestoobtainsomestabilityresultsfornon-selfmappingsbyemployingacertaingeneralcontractivecondition.Ourresultsgeneralizeandextendmostoftheexistingonesintheliterature.

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简介：微粒和集合使液化系统的充分解决的模拟与所谓的联合格子Boltzmann方法和时间驱动的难范围的模型(LBMTDHS)成功地被执行。在这个方法，分离粒子阶段被时间驱动的难范围的模型描述，并且连续液体阶段的管理方程与格子Boltzmann方法被解决。联合的Particlefluid被移动边界方法沉浸实现。时间平均模仿的结果的流动结构在轴的方向显示出核心体环结构的形成和voidage的S字形的分发，它是在使液化系统的典型现象。联合模拟，为推迟的精力消费Nst和搬运固体的结果从使液化的直接数字的模拟(DNS)是计算的，并且稳定性标准Nst/NT=min在扩展内存管理程序/水泡建议模型数字地被验证。而且，数字结果证明在微粒使液化的Nst/NT的价值在集合使液化比那高得多，但是Nst/NT=min为微粒和集合使液化是有效的。

简介：Thelinearstabilityofwall-injectedpressuredrivenCouette-likeflowinpower-lawfluidsisstudied.PreviousstudyonthiskindofflowforNewtonianfluidsbyNicoudandAngilella[Phys.Rev.E56,3000(1997)]wasextendedtopower-lawfluidstounderstandthee?ectsofshear-thinning/thickeningnatureontheflowstability.ArelatedexpressionbetweenthecriticalcrossflowReynoldsnumberforNewtonianfluidsandthatforpower-lawfluidsisobtainedasthestreamwiseReynoldsnumberislargeenoughbasedonnumericalcomputations,andverifiedtheoreticallyinthecaseofalimitingconditionwiththepower-lawindex.

简介：UnlikethepreviousresearchworksanalyzingthestabilityoftheT-S(Takagi?Sugeno)fuzzymodel,anextensiononthestabilityconditionofT-Sfuzzysystemswithadifferentstrategyisprovided.Inthestrategyanewvariable,whichisrelativetothegradeoffuzzymembershipfunction,isintroducedtothestabilityanalysisandanewstabilityconclusionisdeduced.Thedefinitionofstabilityconditioninthispaperisdifferentfrompreviousworks,thoughtheyaresimilarinform.Withtheproposedmethod,thesimulationinflightcontrollawshowsabettereffectiveness.

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

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简介：在声学的logging-while-drilling(ALWD)有限差别及时领域(FDTD)模拟，大练习领子占据，大多数充满液体的地上凿穿并且把地上凿穿液体划分成二薄液体列(半径27公里)。好格子和大计算模型被要求为在工具和形成之间的薄液体区域建模。作为结果，小时间步和更多重复被需要，它增加累积数字错误。而且，在地上凿穿在练习领子和液体之间由于高阻抗形成对照(差别是>30次)，完美地匹配的层(PML)的稳定性和效率策划是批评的精确地模仿复杂波浪模式。在这份报纸，我们在一个蹒跚的格子比较了四不同PML实现有限差别及时在ALWD模拟，包括的切开地的PML(SPML)，multiaxialPML(MPML)，非切开的PML(NPML)，和建筑群的领域(FDTD)转移频率的PML(CFS-PML)。比较显示NPML和CFS-PML能比SPML和M-PML更高效地从计算边界吸收指导波浪思考。在大模拟时间，SPML，M-PML，和NPML是数字地不稳定的。然而，M-PML的稳定性能进一步被改进到某程度。基于分析，我们建议CFS-PML方法在FDTD被使用消除数字不稳定性并且为LWD建模在PML层改进吸收的效率。在LWD模拟的CFS-PML参数的最佳的价值基于几千3D模拟被调查。为典型LWD案例，二次的抑制侧面的最好的最大的价值用一d被获得0。为线性转移频率的因素(0)和可伸缩的因素(0)的最大的值的最佳的参数空间取决于PML层的厚度。为典型形成，如果PML厚度是10个格子点，全球错误能被归结为<当PML厚度增加，1%将用最佳的PML参数，和错误减少。