简介：Therecursivestructureandquasi-recursivestructureofAdaptiveVolterraFil-ter(AVF)areputforward,theiralgorithmsaregiven,andtheircharacteristicsandapplicationsarediscussed.TheintroductionofrecursivestructurecanremarkablyreducetheparametersandcomputationalcostofAVF.
简介：Thefluorineionsensitivefield-effecttransistor（F--ISFET）ismadebydepositingverythinLaF3filmongridoffield-effecttransistorwithsputtermethod.Theoperatingprinciple,measuringmethodandmeasuredresultsofF--ISFETaregiven.Themeasuredresultsshowthatthiskindofsensorhashighersensitivity,shorterresponsetimeandbetterlinearity.Onthebasisofexperimentalresults,thefactorofinfluencingthesteadinessandrepeatabilityofF--ISFETareconjectured.
简介：TheenvironmentofthepostalindustryinChinahasexperiencedtremendouschangesinthepastfewyears.TheenvironmentalchangeshavesomeeffectsontheelementsthatdecidetheservicestructureofChinaPost.Insuchcontext,thecurrentservicestructureofChinaPostneedssomeimprovementstoadaptitselftothechangingenvironment.AimingattheoptimizationoftheservicestructureofChinaPost,thispaperreviewsthelawofitsdevelopmentandmakesananalysisofitscurrentcharacteristicsandtheexistingproblems.
简介：Anewall-opticaldemultiplexerbasedonnonlineareffectinsemiconductorlaseramplifier(SLA)isproposed.ItcandemultiplexallchannelsoftheOTDMsignalconcurrently.anditcanalsobeintegratedonasinglechip.TheproposeddeviceconsistsofaseriesshortFabry-Perotamplifiers(FPSLA)settingonthepathverticsally,throughwhichthepreamplifiedopticalsignaltravels.Perpendicularlytothesignal,K(channelnumber)paralleledbeamsoflightpulse,whichactasprobeswithrepetitionatthebitrateofonechannel,irradiateontheseFP-SLAs,respectively,justwhenthecorrespondingsignalchannelpulsepassesthroughtheactiveregionfromlateralside.Thetransmissivitydependsonthesignalpulse.Theoreticalanalysishasbeengiven.Asademonstratingexample,Adeviceoperatedatthespeedof25Gbit/s(2.5Gbit/s×10)issimulatedandtheresultsshowthattheabout9.24dBextinctionratiocanbeachievedeasily.
简介：Theelectroluminescencethinfilmsdopedwitherbium,fabricatedbythermalevaporationwithtwoboats,areanalyzedbyX-raydiffraction(XRD).Therelationshipbetweenelectroluminescencebrightnessandmicrostructureofthethinfilmsisobtained.Theresultsrevealthatthelargegrainsizeinhighindexplaneofdepositedmicrocrystallinefilmhasaneffectonelectroluminescencecharacteristicsofthefilmdevices.
简介：Theγ-rayradiationwillspeedupthedischargeofthestoredchargeinnonvolatileMNOSstructure.Theradiationabsorptionmechanismtoenhancethedischargeisdiscussed.Adirectradiationemissionmodelfromtheinterfacetrapsdistributingbothinenergylevelandinspaceisgiven.Thetheoreticalresultsbasedonthismodelareingoodagreementwithexperimentalmeasurement.
简介：TheservicestructureofChinapostisnotmatchthepostalresourcesstructure,Coreserviceisnotstressed.Therefore,thepostalservicemustbereorganizedandAdjustedaccordingtothemarketneeds.Thisarticleclassifypostserviceintofivecatalogues,proposesthestrategicorientationofeachcataloguesandanalysestheinteriorstructureofdifferentpostalservice.
简介：Basedonthewhiteningpropertyofwavelettransformationfor1/fnoise,thispaperaddressestheproblemofdetectingdeterministicsignalsinthepresenceof1/ffractalnoise.Thetransferfunctionofwhiteningfilterisprovidedaswellastheconditionforwhitening.ThereceiverstructurebasedonKarhunen-Loeveexpansionandthedecisionrulearealsogiven.Finallyperformanceofthedetectorisanalyzed.
简介：Superlatticesconsistingofalternatinglayersoforganic/polymericmaterialshavebeenfabricatedfromtris(8-hydroxyquinoline)aluminum(Alq3)andpoly(N-vinylcarbazole)(PVK)byamultisource-typehigh-vacuumorganicmoleculardeposition.ThecharacteristicsofsuperlatticestructuresaredeterminedbythesmallangleX-raydiffraction,opticaladsorptionandphotoluminescence.Theelectroluminescentdeviceswiththesuperlatticestructurehavealsobeenfabricatedandtheemissioncharacteristicsarediscussed.
简介：Thedielectricpropertiesofceramicswithcompositionof(Sr1-xBix)TiO3+x/2(wherex=0.05～0.70)weremeasuredatfrequencyof1MHz.Theexperimentalresultsindicatethatthedielectricpropertiesof(Sr1-xBix)TiO3+x/2systemaregreatlyvariedwithanincreaseofthestoichiometricamountsofBi2O3.Therelativepermittivityofthesolidsolutionsishigh,andthedissipationfactorislow.Thepositronannihilationtechnique(PAT)wasadoptedtostudythedefectstructure.AnexplanationofthedielectricpropertiesofBi-dopedSrTiO3ceramicshasbeensuggestedintermsofelectron-compensationandvacancyordefect-compensationmechanismsandspace-chargepolarizationmechanism.
简介：Organicsemiconductoe3,4,9,10-perylenetetracarboxylicdianhydride(PTCDA)hasbeensynthetizedwith1,8-naphthalicanhydrideusingchemicalmethod.X-raydiffractionspectrumshowsthatitismonoclinic.Visibleabsorptionspectrumshowsthatitsgapbandis2.2eVwithsingletexcitonbandwidthof0.9eV.
简介：ＧｒａｔｉｎｇＡｎｇｕｌａｒ－ｍｏｖｅｍｅｎｔＴｒａｎｓｄｕｃｅｒＵｓｉｎｇａＦａｂｒｙ－ＰｅｒｏｔＳｔｒｕｃｔｕｒｅ①ＬＩＺｈｉｑｕａｎ（ＹａｎｓｈａｎＵｎｉｖｅｒｓｉｔｙ，Ｑｉｎｇｈｕａｎｇｄａｏ０６６００４，ＣＨＮ）Ａｂｓｔｒａｃｔ：Ａｎｏｖｅ...
简介：VO2thinfilmswithgoodswitchingpropertieswerepreparedbycontrollingtheannealingtimeandtheannealingtemperatureinavacuumsystem.Thestructural,opticalandelectricalpropertiesofthesampleswerecharacterizedbyusingXRD、XPS、UV-VISandelectricalmeasurements.TheswitchingparametersofVO2thinfilmwereinvestigatedtoo.TheresultsindicatethatbeforeandafterphasetransitiontheresistanceofVO2thinfilmschangesaboutthreeordersofmagnitude,thevariationoffilmtransmittanceof40%hasbeencarriedoutwiththeabsorptivityswitchingvelocityofabout0.2607/minat900nm.Thestructuralpropertyofsampleshasbeenimprovedbutthephase-transitionpropertieshavebeendecreasedbyincreasingtheannealingtimeandannealingtemperature.ThevalenceofVionsandthestructureofsampleshavegreateffectonphasetransitionpropertiesofVO2thinfilms.Discussionontheeffectsofannealingtimeandannealingtemperatureonthephase-transitiontemperatureandhysteresiswidthshowsthatthebestreasonableannealingtimeandannealingtemperaturecanbeachieved.
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![贯彻全国邮电设计<b style='color:red'>院</b>(所)长会议精神 进一步落实邮电部[1994]3<b style='color:red'>号</b>文件要求](/image/thesis18 "贯彻全国邮电设计<b style='color:red'>院</b>(所)长会议精神 进一步落实邮电部[1994]3<b style='color:red'>号</b>文件要求")
