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:Thispaperproposesasimplegeometricalraybasedapproachtosolvethestereocorrespondenceproblemforthesingle-lensbi-prismstereovisionsystem.Eachimagecapturedusingthissystemcanbedividedintotwosub-imagesontheleftandrightandthesesub-imagesaregeneratedbytwovirtualcameraswhichareproducedbythebi-prism.Thisstereovisionsystemisequivalenttotheconventionaltwocamerasystemandthetwosub-imagescapturedhavedisparitieswhichcanbeusedtoreconstructbackthe3-dimensional(3D)scene.ThestereocorrespondenceproblemofthissystemwillbesolvedgeometricallybyapplyingtheepipolargeometryconstraintonthegeneratedvirtualcamerasinsteadoftherealCCDcamera.Experimentsareconductedtovalidatetheproposedmethodandtheresultsarecomparedtothecalibrationbasedapproachtoconfirmitsaccuracyandeffectiveness.
简介:Inthiswork,Bi2Te3films(250nm)arefabricatedonSiO2/Sisubstratesbyradiofrequency(RF)magnetronsputteringatroomtemperature,andthepreparedfilmsareannealedoverthetemperaturerangeof200°Cto400°C.Crystallinityandelectricalpropertiesofthefilmscanbetunedcorrespondingly.ThepowerfactorsofBi2Te3filmsof0.85μW/K2cmto11.43μW/K2cmwereachievedafterannealing.Theinfraredreflectancemeasurementsfrom2.5μmto5.0μmdemonstratethatthereisalsoaslightred-shiftoftheplasmaoscillationfrequencyintheBi2Te3films.Bymeansofplasmoniccalculations,weattributethered-shiftofabsorptionpeakstothereductionofcarrierconcentrationandthechangeofeffectivemassofBi2Te3filmswiththeincreasedannealingtemperature.
简介:Inthispaper,theconceptoftheShortest-RouteTrafficMatrix(SRTM)wasfirstpresented,andthegeneralizedformulaforcomputingringcapacityrequirementinuseofSRTMisgiven.Then,anewcapacitydesignalgorithmwhichisbasedonSRTMwaspresentedforSynchronousDigitalHierarchical(SDH)Bi-directionalSelf-HealingRing(BSHR).ThealgorithmsimulationresultsdemonstratethatthisalgorithmisveryefficientforSDHBSHRcapacitydesignandcanmakelessprojectinvestmentandmakehighutilizationoflinesandequipment.Bymeansofthealgorithminthispaper,capacityoptimizationassignmentforSDHHierarchicalSelf-HealingRing(HSHR)andforATMVirtualPath(VP)-basedSelf-HealingRing(SHR)isalsodiscussed.