简介:Ananalysisisgiventoexplaintheinstabilityofthehighconductivitypropertyofnc-Si:Hfabricated.Detaileddiscussioniscarriedoutconcentratingontheconductivityandgrowthmechanism.Itisassumedthattheinstabilityoftheconductivityofthenc-Si:Hstemsfromtwopart:thephasetransitionfromnanocrystallitesintoa-Si:H,andtheoxygenincorporationofthethinlayerofthefilm,whichcontributesmoretotheeffectwhenthefilmsufferstheexposuretoair.Thetheoryisinagreementwiththeexperimentandmeasurement.
简介:ThisletterproposesaratecontrolalgorithmforH.264videoencoder,whichisbasedonblockactivityandbufferstate.ExperimentalresultsindicatethatithasanexcellentperformancebyprovidingmuchaccuratebitrateandbettercodingefficiencycomparedwithH.264.ThecomputationalcomplexityofthealgorithmisreducedbyadoptinganovelblockactivitydescriptionmethodusingtheSumofAbsoluteDifference(SAD)of16×16mode,anditsrobustnessisenhancedbyintroducingafeedbackcircuitatframelayer.
简介:Photoluminescenceevaluationofpandntype6H-SiCsampleshasbeendone.Resultsshowthatatlowtemperaturethephotoluminescenceof6H-SiCisclearlydominatedbydonor-acceptorpairtransitions,insomecase,free-to-donortransitioncouldbeobservedathighertemperature.Thethermalquenchingprocessesofthephotoluminescencehavebeeninvestigatedtodeterminethepossibleionizationnenergiesoftheimpurities.
简介:Theholeinjection,theradiativerecombinationandthedevicelumi-nescentefficienciesofamorphoussiliconcarbidethinfilmp-I-njunctionlightemit-tingdiodesarequantitativelycalculated,andtheeffectofthecarrier(especiallythehole)injectionandrecombinationprocessesonthedeviceluminescentcharacteris-ticsarerevealed.Withoutconsideringthedevicejunctiontemperature,itisroundthatthedeviceluminescentefficiencymainlydependsontheholeinjectionefficiencyatlowfieldandtheholeradiativerecombinationefficiencyathighfieldrespective-ly.Thetheoreticalanalysesareinwellagreementwiththeexperimentalresults.
简介:TherobustHoocontrolproblemforuncertainstochastictime-delaysystemscontainingnonlinearactuatorsisconsidered.Theuncertaintiesinthesystemsareassumedtosatisfyspecificmatchcondition.Thetimedelaysexitstinstateaswellascontrolinput.Thenewstochasticrobuststabilizationcriterionandasufficientconditionfortheexistenceofstochasticrobuststabilizingcontrollawarederived.Thedday-independentmemorylessrobustH∞controllersareconstructedtostabilizethegivensystemsintermsofagroupoflinearmatrixinequalities.Anumericalsimulationexampleispresentedtoshowthattheproposedapproachisvalid.