简介：Recentprogressesaboutopticalpumpedtunableterahertz(THz)sourcesareinterviewed,includingTHzparametricoscillation(TPO)anddifferencefrequencygeneration(DFG).Wedevelophighefficiencyandhighpowersurface-emittedTPO,aswellasDFGwithnonlinearcrystals.AnovelschemeforthehighefficiencyDFGsourcebasedontheCherenkovphase-matchingtechnologyiscomprehensivelyinvestigatedinbothbulkcrystals.ThewidelytunableopticalTHzradiationisalsoresearchedbasedontheorganicnonlinear4-N,N-dimethylamino-4′-N′-methylstilbazolium2,4,6-trimethylbenzenesulfonate(DSTMS)crystal.

简介：

简介：Themainfocusisnonlinearmodel-baseddynamicpositioning(DP)controlsystemdesign.Anonlinearuniformglobalexponentialstability(UGES)observerproducesnoise-freeestimatesoftheposition,theslowlyvaryingenvironmentaldisturbancesandthevelocity,whichareusedinaproportional-derivative(PD)+feedforwardcontrollaw.Thestabilityofthisobserver-controllersystemisprovedbyintroducingaspecificnonlinearcascadedsystem.ThesimulationresultshavesuccessfullydemonstratedtheperformanceofdesignedDPcontrolsystem.

简介：AnoveltunablechirpedfiberBragggratingtechnologyisproposedandsimulatednumericallybyMatlab.Ifweadhereauniformfibergratingwithsupermagnetostrictivefilmandexposetheminanon-uniformmagneticfield,theperiodofthegratingcanbechangedwiththestrainimposedonitbythemagnetostrictiveeffect.Thechirpedcharacteristicscanbetunedbychangingthemagneticfiledwhichisveryflexibleindesigning.

简介：ByuseoftheKeldyshnn-equilibriumGreen's-functionmethods,thethirdharmonicsusceptibilitiesoftwopolyanilinefamilies,PANI-HCl巨PANI－H3PO4，arccalculated[x^(3)(ω）≈10^-12esu].Itwasfoundthatthethirdharmonicsusceptibilityofpolyanilinestronglydependsonthedelocalizationoftheelectrons.Therefractiveindicesn(λ=589nm)ofPANI-HClandPANI-H3PO4arecalculatedbyuseofthreecommonmethods(theLorentz-Lorentztheoreticalmodel,theGladstone-DalegroupcontributionandtheVogelgroupcorrelation)basedongroupcontributionstomolarrefraction.Thecalculatenvaluesarevariedfrom1.31to1.42forPANI-HCland1.36to1.45forPANI-H3PO4.

简介：Nonlinearfrequencyconversionisoneofthemostfundamentalprocessesinnonlinearoptics.Ithasawiderangeofapplicationsinourdailylives,includingnovellightsources,sensing,andinformationprocessing.Itisusuallyassumedthatnonlinearfrequencyconversionrequireslargecrystalsthatgraduallyaccumulateastrongeffect.However,thelargesizeofnonlinearcrystalsisnotcompatiblewiththeminiaturisationofmodernphotonicandoptoelectronicsystems.Therefore,shrinkingthenonlinearstructuresdowntothenanoscale,whilekeepingfavourableconversionefficiencies,isofgreatimportanceforfuturephotonicsapplications.Inthelastdecade,researchershavestudiedthestrategiesforenhancingthenonlinearefficienciesatthenanoscale,e.g.byemployingdifferentnonlinearmaterials,resonantcouplingsandhybridizationtechniques.Inthispaper,weprovideacompactreviewofthenanomaterials-basedefforts,rangingfrommetaltodielectricandsemiconductornanostructures,includingtheirrelevantnanofabricationtechniques.

简介：新奇秒顺序非线性的光色基(DCDHF-2-V)被丁间醇醛冷凝作用反应从3-Hydroxy-3-methyl-2-butanae，propanedinitrile和4-diethylaminobenzaldehyde综合。分子的结构的描述被元素的分析，FTIR，和1H-NMR系列调查。从DSCthermogram获得的融化的点是几乎251掳C，并且混合物显示出热稳定性直到270掳C。色基的秒顺序NLO性质被solvatochromic方法测量。从量机械的二水平的模型，DCDHF-2-V的渭g尾价值是6520脳，这能被获得10?在1064nm的波长的48esu。CLC数字O621.21

简介：TheBayesianapproachisconsideredasthemostgeneralformulationofthestateestimationfordynamicsystems.However,mostoftheexistingBayesianestimatorsofstochastichybridsystemsonlyfocusontheMarkovjumpsystem,fewliteratureisrelatedtotheestimationproblemofnonlinearstochastichybridsystemswithstatedependenttransitions.Accordingtothisproblem,anewmethodologywhichrelaxesquitearestrictiveassumptionthatthemodetransitionprocessmustsatisfyMarkovpropertiesisproposed.Inthismethod,ageneralapproachispresentedtomodelthestatedependenttransitions,thestateandoutputspacesarediscretedintocellspacewhichhandlesthenonlinearitiesandcomputationallyintensiveproblemoffline.ThenmaximumaposteriorestimationisobtainedbyusingtheBayesiantheory.Theefficacyoftheestimatorisillustratedbyasimulatedexample.

简介：Theproblemofrobustifyinglinearquadraticregulators(LQRs)foraclassofuncertainaffinenonlinearsystemsisconsidered.First,theexactlinearizationtechniqueisusedtotransformanuncertainnonlinearsystemintoalinearoneandanoptimalLQRisdesignedforthecorrespondingnominalsystem.Then,basedontheintegralslidingmode,adesignapproachtorobustifyingtheoptimalregulatorisstudied.Asaresult,thesystemexhibitsglobalrobustnesstouncertaintiesandtheidealslidingmodedynamicsisthesameasthatoftheoptimalLQRforthenominalsystem.Aglobalrobustoptimalslidingmodecontrol(GROSMC)isrealized.Finally,anumericalsimulationisdemonstratedtoshowtheeffectivenessandsuperiorityoftheproposedalgorithmcomparedwiththeconventionaloptimalLQR.

简介：AmodifiedversionoftheCotte,Lions,MorelandCoiltheoryforimageselectivesmoothingandedgedetectionisproposed.Comparingwiththeirmodel,themostimportantadvantageofthismodificationisthattheconvolutionwithGaussianprocessesinthefilteringprocessisreplacedbysolvinganinitial-boundaryvalueproblemfortheheatequation,whichsimplifiesthenumericalschemetosomeextent.Numericalexperimentsonnaturalimagesarepresentedforthismodel.

简介：Propertiesofdampingelectronsincollisionwithphotonsbasedonmulti-photonnonlinearComptoneffectareinvestigated.Theexpressionsofthedifferentialscatteringsectionarederived.Severalusefulconclusionsaredrawn.

简介：

简介：Inthespaceborne/airborneforward-lookingbistaticsyntheticapertureradar(SA-FBSAR),duetothesystemplatforms'remarkablevelocitydifferenceandtheforward-lookingmode,therangecellmigration(RCM)notonlydependsonthetarget'stwodimensionallocation,butalsovarieswiththerangelocationnonlinearly.Andthenonlinearityisnotjusttheslightdeviationfromthelinearpart,butexhibitsevidentnonlineardepartureintheRCMtrajectory.IftheRCMisnotproperlycorrected,nonlinearimagedistortionswouldoccur.BasedontheRCMmodel,amodifiedtwo-stepRCMcompensation(RCMC)methodforSA-FBSARisproposed.Inthismethod,firstlytheazimuth-dependentRCMiscompensatedbythescalingFouriertransformandthephasemultiplication.Andthentherange-dependentRCMisremovedthroughinterpolation.TheeffectivenessoftheproposedRCMCmethodisverifiedbythesimulationresultsofbothpointscatterersandareatargets.

简介：Inpractice,retrainingatrainedclassifierisnecessarywhennoveldatabecomeavailable.ThispaperadoptsanincrementallearningproceduretoadaptivelytrainaKernel-basedNonlinearRepresentor(KNR),arecentlypresentednonlinearclassifierforoptimalpatternrepresentation,sothatitsgeneralizationabilitymaybeevaluatedintime-variantsituationandasparserrepresentationisobtainedforcomputationallyintensivetasks.Theaddressedtechniquesareappliedtohandwrittendigitclassificationtoillustratethefeasibilityforpatternrecognition.

简介：Dispersionandnonlineardistortionhaveaneffectontransmissionperformancesofopticalfibertransimissionsystems,Theschemesofdispersioncompensationandnonlineardistortionself-compensationintelecom-CATVco-networktransmissionsystemsarereported,followedbyinvestigationon(1)theimpactofdispersioncompensationfiber(DCF)onfibernonlineareffectswithacascadeoferbium-dopedfiberamplifiers(EDFAs)anddifferentdispersioncompensationschemes,(2)theimpactofthecomplexonthetotalnonlineardistortioninducedbyEDFAgaintiltandthelightsource.Asaresult,dispersioncompensationoptimalschemeandEDFAnegativegaintiltaresuggestedasasolutiontodispersioncompensationoptimalschemeandEDFAnegativegaintiltaresuggestedasasolutiontodispersioncompensationandthenonlineardistortionself-compensation.

简介：当有一样的波长的泵脉搏是在为恢复信号光谱的钟部件的两个方向的输入时，非线性的光纤维环镜子的产量特征详细被分析。双输出脉搏在非线性的光纤维环镜子的传播端口被生产，这被发现。产量脉搏山峰及时被定位在泵的升起并且掉落的边的领域搏动。泵脉搏的升起并且掉落的边能被这个方法直接提取，这被表明。通过数字模拟，亲戚的效果在产量脉搏的特征上泵脉搏和纤维的分散推迟被学习。由光谱分析，产量脉搏顺序的光谱包括泵脉搏顺序的钟部件，这被发现，并且一个新想法被为所有光的钟抽取提供。

简介：

简介：AnovelH_∞tracking-baseddecentralizedindirectadaptiveoutputfeedbackfuzzycontrollerforaclassofuncertainlarge-scalenonlinearsystemsisdeveloped.Byvirtueoftheproperfilteringoftheobservationerrordynamics,theobserver-baseddecentralizedindirectadaptivefuzzycontrolschemeispresentedforaclassoflarge-scalenonlinearsystemsusingthecombinationofH_∞trackingtechnique,afuzzyadaptiveobserverandfuzzyinferencesystems.Theoutputfeedbackandadaptationmechanismsarebothrobustandimplementableindeedowingtotheirfreedomfromtheunavailableobservationerrorvector.Allthesignalsoftheclosed-looplargescalesystemareguaranteedtostayuniformlyboundedandtheoutputerrorstakeonH_∞trackingperformance.Simulationresultssubstantiatetheeffectivenessoftheproposedscheme.

简介：AnewlygrownBaGa4Se7crystalhasbeensynthesizedviatheBridgman-Stockbargertechnique.Thisnewcrystalhasadvantagesofhighnonlinearoptics(NLO)coefficients,highlaserdamagethresholds,andwidetransparentregions.TheBaGa4Se7crystalhasbrightapplicationprospectsasanonlineargainmediuminmid-infraredandterahertzregions.Inthispaper,thecrystallinestructureandsyntheticmethodoftheBaGa4Se7crystalareintroduced.Therefractiveindicesandabsorptioncoefficientsalongthreedielectricaxesbetween0.1THzand1.0THzarealsoobtained.Theterahertzdifferencefrequencygeneration(THz-DFG)characteristicsbasedontheBaGa4Se7crystalinthefrequencyrangeof0.1THzto1.0THzareanalyzedtheoreticallyandthephase-matchingconditionsarecalculated.TheapplicationofBaGa4Se7crystalsinterahertzwavegenerationisalsodiscussed.

简介：