简介:OneofthemostsignificantrecentdevelopmentsinmusicologyhasbeenthetranscriptionandinterpretationofcertainmusicalcuneiformtextsdatingfromthesecondmillenniumBC.IthasbeenestablishedthatOldBabylonianmusicwasdiatonicandprobablybasedonsevenheptachords,correspondingtothefirstseventonesoftheancientGreekoctavespecies.However,thereremainsaproblem:thereissomeambiguityinthetextsaboutwhetherthescalesshouldberisingorfalling,andtheirnomenclaturechangingaccordingtowhichdirectionischosen.Thisarticlesuggestsapossibleresolutionofthedifficulty.OntheassumptionthatOldBabyloniantheoreticiansmighthavequantifiedtheirscales,thearticlearithmetizesthetuningproceduresofthetwomaincuneiformtuningtextstogether,asasingleprocess,andtherebyalsodemonstratestheplausibilityofthehypothesisthattheidealizedmodelforBabyloniantuningwouldbelikelytohavebeenJusttuningratherthanPythagoreantuning,ashasbeengenerallyassumed.
简介:有与采样为非线性的系统的一个类活跃骚乱拒绝控制(ADRC)调节的参数的担心快不足够评估的这份报纸。理论结果显示出在采样率之间的量的关系,ADRC的参数,在系统和靠近环的系统的性质的无常的尺寸。而且,在给定的采样率下面的样品数据ADRC的能力是讨论的份量上。
简介:一个简单方法被建议为一个系列串联控制系统设计P/PI控制器为不稳定首先订正时间延期(FOPTD)系统。在这份报纸,为与稳定/不稳定的FOPTD系统在系列串联的不稳定的FOPTD系统的控制器设计被考虑。建议方法基于等同s和s的相应力量的系数2为一个伺服问题在靠近环的转移的分母的到乘那些的1和2的分子工作。开的环系统由与一个稳定/不稳定的FOPTD系统在系列串联的一个不稳定的FOPTD系统组成。仅仅二调节参数(1和2)为控制器的设计被要求。靠近环的表演为伺服和规章的问题被评估,表演被发现比很好确定的合成方法的好。为在模型参数的无常的坚韧性被学习并且由合成方法与控制器的相比设计了。
简介:Wereportonthemodeling,simulation,andexperimentaldemonstrationofcompletemodecrossingsofFanoresonanceswithinchip-integratedmicroresonators.Thecontinuousreshapingofresonantlineshapesisachievedvianonlinearthermo-opticaltuningwhenthecavity-coupledopticalpumpispartiallyabsorbedbythematerial.Thelocallygeneratedheatthenproducesathermalfield,whichinfluencesthespatiallyoverlappingopticalmodes,allowingustoaltertherelativespectralseparationofresonances.Furthermore,weexploitsuchtunabilitytocontinuouslyprobethecouplingbetweendifferentfamiliesofquasi-degeneratemodesthatexhibitasymmetricFanointeractions.Asaparticularcase,wedemonstrateacompletedisappearanceofoneofthemodalfeaturesinthetransmissionspectrumaspredictedbyFano(Phys.Rev.124,1866(1961))Thephenomenonismodeledasathird-ordernonlinearitywithaspatialdistributionthatdependsonthestoredopticalfieldandthermaldiffusionwithintheresonator.Theperformednonlinearnumericalsimulationsareinexcellentagreementwiththeexperimentalresults,whichconfirmthevalidityofthedevelopedtheory.
简介:ThepossibilitytoadjusttexturalpropertiesofITHandIWWzeolitesbythevariationofconditions(e.g.temperature,pH,duration)ofacidicleachingwasshown.WhilethegrowthofthetemperatureofacidtreatmentcausedtheincreasingamountofleachedGeatomsandenhancingvolumesofbothmicroandmesoporesat80℃,themesoporevolumeinITH(Si/Ge=3.4and5.8)andIWW(Si/Ge=3.3)zeoliteschangedwiththedurationofthetreatment(pH=2;T=80℃)asfollows:96h<1h<24h.Independentlyonthechemicalcompositionandzeolitetopology,thetreatmentofgermanosilicatezeolitesatpH=2–7resultedindevelopmentofbothmicroandmesoporosityaccompaniedbytheextractionofsubstantialamountofGeatoms,whiletheincreasingacidityuptopH=0resultedinsomereductionofGeextractionandinthedevelopmentofmesoporesatmaintainedvalueofmicroporevolumewhencomparedwithinitialgermanosilicates.Thehigheractivity(i.e.numberofreactantmoleculesconvertedperactivesite)ofgermanosilicatewithmodifiedmicro-mesoporouschannelsystemincomparisonwithparentIWWzeoliteinesterificationoflevulinicacidwasattributedtoenhancedaccessibilityofactivesites.
简介:Thefidelityofteleportationofcontinuousquantumvariablescanbeimprovedbytuningthelocaldisplace-mentgain.WeinvestigatetheoptimizationofthefidelityfortheteleportationofSchrodingercatstates,andofcoherentstates.Itisfoundthatthegaincorrespondingtothemaximumfidelityisnotequaltooneforthetwoinputstatesinthecaseofthesmallsqueezingdegreeoftheentanglementresource,whileunitydisplacementgainisthebestchoiceforteleportingarbitraryquantumstatesinthecaseoflargesqueezing.
简介:Ininjectionmouldingproduction,thetuningoftheprocessparametersisachallengingjob,whichreliesheavilyontheexperienceofskilledoperators.Inthispaper,takingintoconsiderationoperatorassessmentduringmouldingtrials,anovelintelligentmodelforautomatedtuningofprocessparametersisproposed.Thisconsistsofcasebasedreasoning(CBR),empiricalmodel(EM),andfuzzylogic(FL)methods.CBRandEMareusedtoimitaterecallandintuitivethoughtsofskilledoperators,respectively,whileFLisadoptedtosimulatetheskilledoperatoroptimizationthoughts.First,CBRisusedtosetuptheinitialprocessparameters.IfCBRfails,EMisemployedtocalculatetheinitialparameters.Next,amouldingtrialisperformedusingtheinitialparameters.ThenFLisadoptedtooptimizetheseparametersandcorrectdefectsrepeatedlyuntilthemouldedpartisfoundtobesatisfactory.Basedontheabovemethodologies,intelligentsoftwarewasdevelopedandembeddedinthecontrollerofaninjectionmouldingmachine.Experimentalresultsshowthattheintelligentsoftwarecanbeeffectivelyusedinpracticalproduction,anditgreatlyreducesthedependenceontheexperienceoftheoperators.
简介:A16-channeldualtuningwavelengthdivisionmultiplexer/demultiplexerbasedonsilicononinsulatorplatformisdemonstrated,whichisbothpeakwavelengthtunableandoutputopticalpowertunable.Thewavelengthdivisionmultiplexer/demultiplexerconsistsofanarrayedwaveguidegratingforwavelengthdivisionmultiplexing/demultiplexing,aheaterforpeakwavelengthtuningandavariableopticalattenuatorbasedonp–i–ncarrier-injectionstructureforopticalpowertuning.Theexperimentalresultsshowthattheinsertionlossonchipofthedeviceis3.7dB–5.7dBandthecrosstalkis7.5dB–9dB.Forthetunabilityofthepeakwavelength,1.058-nmwavelengthtunabilityisachievedwith271.2-mWpowerconsumption,andtheaveragemodulationefficiencyis3.9244nm/W;forthetunabilityoftheopticalpower,theopticalpowerequalizationisachievedinall16channels,20-dBattenuationisachievedwith144.07-mWpowerconsumption,andtheraise/falltimeofVOAis35ns/42ns.
简介:Thewavelengthtuningragesofagratingexternal-cavitylaserdiode(ECLD)havebeenstudiedbytheequivalentavitymethod.Themaximumtuningrange(MTR)andthecontinuoustundingrange(CTR),whicharerelatedtothemaximumandtheminimumthresholdcarrierdensities,arededucedfromthethresholdcondition.WedefinearatiooftheCTRtotheMRT.ThisratioisonlydeterminedbythereflectivitiesoftheexternalandinternalfacetsoftheECLD.TheanalysisshowsthatthereisanappropriatecombinationoftheexternalandinternalcavityreflectivitestoobtainagivenCTRinthedesignofanECLD.
简介:Formultisensorsystems,whenthemodelparametersandthenoisevariancesareunknown,theconsistentfusedestimatorsofthemodelparametersandnoisevariancesareobtained,basedonthesystemidentificationalgorithm,correlationmethodandleastsquaresfusioncriterion.SubstitutingtheseconsistentestimatorsintotheoptimalweightedmeasurementfusionKalmanfilter,aself-tuningweightedmeasurementfusionKalmanfilterispresented.Usingthedynamicerrorsystemanalysis(DESA)method,theconvergenceoftheself-tuningweightedmeasurementfusionKalmanfilterisproved,i.e.,theself-tuningKalmanfilterconvergestothecorrespondingoptimalKalmanfilterinarealization.Therefore,theself-tuningweightedmeasurementfusionKalmanfilterhasasymptoticglobaloptimality.Onesimulationexamplefora4-sensortargettrackingsystemverifiesitseffectiveness.
简介:Inthispaper,amultidimensionaltuningmethodofthesilicamicrocapillaryresonator(MCR)isproposedanddemonstratedwherebytheextinctionratio(ER)aswellastheresonantwavelengthcanbeindividuallycontrolled.AnERtuningrangeofupto17dBandamaximumtuningsensitivityof0.3dB/μmarerealizedduetothetaperedprofileofthesilicaopticalmicrofiber(MF)whentheMFisadjustedalongitsaxialdirection.Comparedtodirecttuningofthecouplinggap,thismethodcouldlowertherequirementfortheresolutionofdisplacementstagetomicrometers.WhentheMFisadjustedalongtheaxialdirectionofthesilicamicrocapillary,aresonanceshiftof3.06nmandmaximumtuningsensitivityof0.01nm/μmareachieved.Thismethodavoidstheuseofanappliedexternalfieldtocontrolthesilicamicroresonators.Moreover,whenairisreplacedbyethanolandwaterinthecoreofthesilicamicrocapillary,amaximumresonanceshiftof5.22nmisalsoachievedtofurtherenlargetheresonancetuningrange.Finally,amicrobubbleresonatorwithahigherQfactorisalsofabricatedtoachieveanERtuningrangeof8.5dB.OurmethodfullytakesadvantageoftheuniquestructureoftheMCRtoseparatelyandeasilytuneitskeyparameters,andmaybroadenitsapplicationsinopticalsignalprocessingandsensing.
简介:AsimplePIcontrollertuningmethodforlargedead-timeprocessesispresented.First,afirst-orderplusdeadtimemodelisidentifiedonthebasisofrelayfeedbackexperiments,whichNyquistcurveisveryclosetothatoflargedead-timeprocessesoverawidefrequencyrange.Withthemodelavailable,PIcontrollerisdesignedwithanewrobustspecification.SimulationexamplesshowtheeffectivenessandfeasibilityofthepresentedPItuningmethodforlargedeadtimeprocesses.
简介:Amethodofmeasuringtheinteractionsinamultivariablecontrolsys-tem(MVCS)intimedomainisdefinedinthispaper.Anintelligentdecouplingcom-pensatorisdesignedintermsoftheconceptoffuzzycontrol,sothattheauto-tuningofcontrollers’parametersina2×2MVCScanbeturnedintothatoftwoindependentsingle-loopcontrolsystems(SLCS).Themethodpresentedinthepaperhassuccess-fullybeenusedinasimulationexperimentontheautomatictuningofacoordinatedcontrolsystem(CCS)inthedrum-boilerturbogeneratingunit(DBTU)andthesimu-lationresultsaxesatisfactory.
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简介:这份报纸处理一个模式III界面的裂缝题目到反飞机应力和在里面飞机电场。分析专注于从不一致的ferroelectric-ferroelastic领域由一个电场切换调节破裂坚韧。电的装载改变不对称的切换地区的尺寸。采用重量功能方法,我们获得韧化为的电子上依赖的开关静止并且变得界面的伪静电干扰分别地裂开。多域答案为杆得非、杆得充分的铁电体composites被导出。数字结果在批评应用压力紧张因素调节的电场上被介绍。研究提供方法由改变电场优化铁电体composites的破裂性质。