简介:Themixedl1/H2optimizationproblemforMIMO(multipleinput-multipleoutput)discrete-timesystemsisconsidered.Thisproblemisformulatedasminimizingthel1-normofaclosed-looptransfermatrixwhilemaintainingtheH2-normofanotherclosed-looptransfermatrixatprescribedlevel.ThecontinuitypropertyoftheoptimalvalueinrespecttochangesintheH2-normconstraintisstudied.Theexistenceoftheoptimalsolutionsofmixedll/H2problemisproved.Becausethesolutionofthemixedl1/H2problemisbasedonthescaled-Qmethod,itavoidsthezerointerpolationdifficulties.Theconvergentupperandlowerboundscanbeobtainedbysolvingasequenceoffinitedimensionalnonlinearprogrammingforwhichmanyefficientnumericaloptimizationalgorithmsexist.
简介:中华文明源远流长,几千年来,创造了光辉灿烂的艺术和文化,可是,经历了太多的自然环境的侵蚀和战争等人为的破坏之后,很多艺术品的原作已被损毁,幸存下来的,也多是颜色陈旧灰暗,早已失去了往昔的风采,因为非常珍贵,这些艺术品往往被珍藏在博物馆,纪念馆或美术馆中,与平民百姓保持着一定的距离,怎样对艺术品原作进行有效的保护,怎样让艺术走近平民大众,成为摆在了现今人们面前的一道难题。
简介:Aprocesssuitableforproductiononalargescaleofcoldlightmirrorforfilmprojectorisintroduced.DepositionparametersrequiredforproducingTiO2/SiO2opticalmultialyersystemsbyelectronbeamevaporationofTiO2andSiO2startingmaterialsareinvestigated.Manufactureandtechniquesofcoldmirrorandtheadhesion,stability,wearandcorrosionresistanceofcoldmirrorbythisprocessarediscussed.Theresultshowsthatcoldmirrorproducedhasgoodopticalpropertiesandbetteradhesion.
简介:本文采用负电源纯模拟电路方案对长波段掺铒光纤放大器(L-bandEDFA)的980nm泵浦激光器的驱动电路和温度控制电路进行了设计和调试,得到符合设计要求的结果.并以此为基础对我们自制的L-bandEDFA进行了实验测试,取得了令人满意的结果.
简介:Inthispaper,usedBSO(Bi12SiO20)crystalasahologramrecordingmaterial,TV-cameraasadetector,andaholographicsetupcontrolledbyacomputer,automaticallycalculatinghologramof3-interferogramsmethodistheoreticallyandexperimentallystudied.Thisnewholographicrecordingmaterialandautomaticallycalculatinghologrammakeitpossibletousereal-timeholographyinanindustry.Asapracticalexample,theshrinkingof2-componentsadhesivein4hismeasured.
简介:Inthispaper,anewresult,newformulasoftransferfunctionandinputimpedancefor2-Ddissipativereactancenetworkcascadesynthesisisgivenintermsofsimplifiedformulastorealizedoublyterminatedresistively1-Ddissipativereactancenetworks.Thenewresultincludesthemoregeneralcases,e.g.thebothcanbedissipativeoroneisdissipativeandtheanotherisalosslessreactancesubnetworkandsoon.Twocalculationexamplesaregiveninthepapertoillustratetheaboverealizations.Besides,consideringsomeproblemsofthedirectconnectionbetweentwosubnetworks,wealsointroduceone-waylinestodiscussthecascadesynthesisofnonreciprocal2-Ddissipativereactancenetworks.
简介:Anovelpre-ionizationschemeofhelicaltransverse-pulsedpre-ionizationinalongitudinaldischargeCO2laserispresented.Thelasertubeismadeofglasswithinnerdiameterof7.5mmanddischargelengthof50cm.Thelaserperformancecharacteristicsasfunctionsofparameters,suchaspressure,chargingcapacitanceandappliedvoltage,areinvestigated.Comparedwiththesamelaserstructurewithoutpre-ionization,themaximumpulseenergyimprovesby23%,theoptimumelectro-opticalefficiencyincreasesby31%,andthespecificoutputenergyreaches26J/(L·atm).