简介：Inthispaper,LyapunovfunctionmethodisusedtostudytherobustabsolutestabilityofgeneralintervalLur'etypenonlinearcontrolsystems.Asaresult,algebraicallysufficientconditionswithintervalmatrixinequalityformareobtainedforthegeneralintervalLur'etypenonlinearcontrolsystems,thustherelationshipbetweenthestabilityofsymmetricalintervalmatrixandtherobustabsolutestabilityofgeneralintervalLur'etypenonlinearcontrolsystemsisestablished.

简介：Thehighpowerholeyfiberisanefficientsupercontinuumlightsourcebyusingpicosecondpulse,whichisalessexpensivelasersourcecomparedwithlowpowerandexpensivefemtosecondlasersources.Inthispaper,ahighpowerhighlynonlinearholeyfiber(HN-HF)withalowconfinementlossisproposedforsupercontinuumlightsources.ThefinitedifferencemethodisusedtocalculatethedifferentpropertiesoftheproposedHN-HF.Highnonlinearcoefficientsareobtainedat1.06μm,1.31μm,and1.55μmwavelengthswithflattenedchromaticdispersionandlowconfinementlossessimultaneously.Moreover,numericalsimulationresultsshowthathighpowerbroadsupercontinuumspectrawithveryshortlengthoftheproposedphotoniccrystalfiberareachieved.

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简介：Performancerobustnessproblemsviathestatefeedbackcontrollerareinvestigatedforaclassofuncertainnonlinearsystemswithtime-delayinbothstateandcontrol,inwhichtheneuralnetworksareusedtomodelthenonlinearities.Byusinganappropriateuncertaintydescriptionandthelineardifferenceinclusiontechnique,sufficientconditionsforexistenceofsuchcontrollerarederivedbasedonthelinearmatrixinequalities(LMIs).UsingsolutionsofLMIs,astatefeedbackcontrollawisproposedtostabilizetheperturbedsystemandguaranteeanupperboundofsystemperformance,whichisapplicabletoarbitrarytime-delays.

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简介：Theanalyticalexpressionofbiterrorprobabilityinabalanceddifferentialphase-shiftkeying(DPSK)opticalreceiverconsideringnonlinearphasenoiseandEDFAASEnoiseisgiven,whichisveryusefultoestimatetheperformanceofDPSKbalancedandunbalancedreceiverinopticalcommunicationsystem.Throughanalysis,ifonlynonlinearphasenoiseisconsidered,boththebalanceandunbalancedreceivershavethesameperformances.ButifaddingtheASEnoiseofEDFA,thebalancedreceiverisbetter.

简介：Themechanismofanon-polarizingbeamsplitter(NPBS)withasymmetricaltransfercoefficientscausingtherotationofpolarizationdirectionisexplainedinprinciple,andthemeasurementnonlinearerrorcausedbyNPBSisanalyzedbasedonJonesmatrixtheory.Theoreticalcalculationsshowthatthenonlinearerrorchangesperiodically,andtheerrorperiodandpeakvaluesincreasewiththedeviationbetweentransmissivitiesofp-polarizationands-polarizationstates.Whenthetransmissivityofp-polarizationis53%andthatofs-polarizationis48%,themaximumerrorreaches2.7nm.TheimperfectionofNPBSisoneofthemainerrorsourcesinsimultaneousphase-shiftingpolarizationinterferometer,anditsinfluencecannotbeneglectedinthenanoscaleultra-precisionmeasurement.

简介：Ahybridsystemofthefuzzyc-means(FCM)clusteringalgorithmandadaptive-two-stagelinearapproximationwaspresentedfornonlineardistortioncancellationofradiofrequency(RF)poweramplifier(PA).Thismechanismcaneffectivelyeliminatenoise,adaptivelymodelPA’sinstantaneouschange,andefficientlycorrectnonlineardistortion.ThisarticleputsforwardtheFCMclusteringalgorithmforclusteringreceivedsignalstoeliminatewhitenoise,andthenusestheadaptive-two-stagelinearapproximationtofittheinversefunctionoftheamplitude’sandphase’snonlinearmappingduringthetrainingphase.Parametersofthelinearfunctionandsimilarityfunctionaretrainedusingthegradient-descentandminimummean-squareerrorcriteria.Theproposedapproach’strainingresultsisdirectlyemployedtoeliminatesamplingsignal’snonlineardistortion.Thishybridmethodisrealizedeasierthanthemulti-segmentlinearapproximationandcouldreducethereceivedsignal’sbiterrorrate(BER)moreefficiently.

简介：Theevolutionoftheelectronphaseorbitsbasedonthemulti-photonnonlinearComptonscatteringwiththehighpowerlaser-plasmaisdiscussedbyusingKroll-Morton-Rosenbluththeory.Therandomevolutionoftheun-capturedelectronphaseorbitsfromperiodicitytonon-periodicityisfoundaftertheenergyhasbeenexchangedbetweentheelectronandphotons.Withtheincreaseoftheabsorbedphotonnumbernbyanelectron,thisevolutionwillbemoreandmoreintense,whilewhichisrapidlydecreasedwiththeenhancementofthecollisionnon-flexibilityξandtheirinitialspeedsoftheelectronsandphotons,butthisevolutionislowerthanthatinthehighpowerlaserfield.Whentheelectronsarecapturedbythelaserfield,theevolutionisfinished,andtheelectronswillstablytransport,andthephotonsdon'tprovidetheenergyfortheseelectronsanymore.

简介：Theproblemofadaptivefuzzycontrolforaclassoflarge-scale,time-delayedsystemswithunknownnonlineardead-zoneisdiscussedhere.Basedontheprincipleofvariablestructurecontrol,adesignschemeofadaptive,decentralized,variablestructurecontrolisproposed.Theapproachremovestheconditionsthatthedead-zoneslopesandboundariesareequalandsymmetric,respectively.Inaddition,itdoesnotrequirethattheassumptionsthatallparametersofthenonlineardead-zonemodelandthelumpeduncertaintyareknownconstants.Theadaptivecompensationtermsoftheapproximationerrorsareadoptedtominimizetheinfluenceofmodelingerrorsandparameterestimationerrors.Bytheoreticalanalysis,theclosed-loopcontrolsystemisprovedtobesemi-globallyuniformlyultimatelybounded,withtrackingerrorsconvergingtozero.Simulationresultsdemonstratetheeffectivenessoftheapproach.

简介：用毫微秒脉搏，在红外线附近、中间红外线的激光作为泵来源搏动，我们经由四波浪的差别频率混合获得兆兆赫波浪来源。从联合波浪理论，我们详细分析GaSe水晶和碱金属蒸汽的四波浪的混合进程，得到兆兆赫波浪输出力量的分析表达式，并且讨论为完成阶段匹配的条件。由调整泵频率，碱金属蒸汽的第三顺序的非线性的极化是提高回声的。这个节目提供高力量的兆兆赫放射来源的一种新类型。

简介：一面非线性的光环镜子(NOLM)基于线性洞可切换的多波长做耳的纤维(EDF)激光被建议并且试验性地示威了。由于紧张依赖者transmissivity的特征，NOLM能有效地减轻同质的拓宽获得媒介的模式比赛，以便放射激光的多波长能在房间温度被完成。由调整极化控制器(PC)的状态，在建议激光罐头的放射激光的波长的数字在1530nm的波长附近与0.4nm的波长间距从11～13灵活地被调整。

简介：Tosolvetheflightsafetyproblemcausedbynonlinearinstabilities(categoryIIpilotinducedoscillations,PIOs)oftheclosed-looppilot-vehiclesystemwithrate-limitingactuator,theantiwindup(AW)compensationmethodtoavoidcategoryIIPIOsisinvestigated.Firstly,theAWcompensationmethodoriginallyusedforcontrollinginputmagnitudelimitedsystemisintroduced,thenthismethodisextendedforcontrollinginputrate-limitingsystemthroughacirclecriteriontheorem.Secondly,theestablishmentoftheAWcompensatoristransformedintothesolvingoflinearmatrixinequalities.Finally,anAWcompensatorestablishmentalgorithmfortheclosed-looppilot-vehiclesystemwiththerate-limitingactuatorisobtained.TheeffectivenessoftheAWcompensationmethodtoavoidcategoryIIPIOsisvalidatedbytime-domainsimulations,andcomparedwithrate-limitedfeedback(RLF)commandratecompensationmethod.TheresultsshowthattheAWcompensationmethodcaneffectivelysuppresscategoryIIPIOsandmaintainthenominalperformancewhentheclosed-looppilot-vehiclesystemisnormal.Unlikethecommandratecompensatorwhichworksuponsystemuninterruptedly,theAWcompensationmethodaffectstheclosed-looppilot-vehiclesystemonlywhentherate-limitingofactuatorisactivated,soitisanovelPIOavoidancemethod.

简介：:Twonovelpoly[(3-alkyhhiophene-2,5-diyl)-(benzylidenequinomethane-2,5-diyl)s]derivatives,poly[(3-butylthiophene-2,5-diyl)-(p-N,N-dimethylamino)benzylidenequinomethane-2,5-diyl)](PBTDMABQ)andpoly[-(3-octylthiophene2,5-diyl)-(p-N,N-dimethylamino)benzylidenequinomethane-2,5-diyl)](POTDMABQ),weresynthesized.Thebandgapsofthetwopolymersarecalculatedas1.75eVforPBTDMABQand1.69eVforPOTDMABQ,respectively.Thehomogenousfilmsofthetwopolymerswerepreparedandtheirthird-ordernonlinearopticalpropertieswerestudiedbythebackwarddegeneratefour-wavemixingat532nm.Byusingtherelativemeasurementtechnique,thethird-ordernonlinearopticalsusceptibilitiesofPBTDMABQandPOTDMABQarecalculatedas5.62×10^-9and1.22×10^-8ESU,respectively.Itisfoundthatsubstitutedalkygroupshavestrongeffectsonthebandgapandnonlinearopticalpropertiesofthetwopolymers.Therelativelybigthird-ordernonlinearopticalsusceptibilitiesandsmallbandgapofPOTDMABQresultedmainlyfromthelongeralkylwithstrongelectron-donatingabilitycanenhancethedelocationdegreeofconjugatedπelectronics.