简介:Inthispaper,wedemonstratetheacetylehe(C2H2)sensorwithhighsensitivityusingahollow-corephotonicbandgapfiber(HC-PCF).ExperimentsformeasuringC2H2concentrationsingasmixtureareperformed.Usinga2m-longHC-PCFasgascell,thespectrumofacetyleneatn1+n3bandhasbeenmeasured,andtheP11-branchhasbeenselectedforthepurposeofsensing.Aminimumdetectivityof143partspermillionbyvolume(ppmv)forthesystemconfigurationisestimated.
简介:TheanalysisofsolarcellperformancehasbeendonebysimulatingtheexternalI-Vcharacteristicsofn^+/p/p^+singlecrystalsiliconsolarcellunderhighlightintensityand1.5airmass(AM).Thismethodallowsthemaximizationofsolarcellefficiency.Tofabricatelow-costn^+/p/p^+singlecrystalsiliconsolarcells,solidsourceofdopedphosphorousandboronwasused.
简介:TheconventionaltransmitantennaselectionforVerticalBellLaboratoriesLayeredSpaceTime(V-BLAST)systemisverycomplexbecauseitneedstocomputetheinverseofchannelmatricestimeaftertime.Inthispaper,anewgrouptransmitantennaselectionschemeforV-BLASTsystemisproposed.The1stgrouptransmitantennasaredecidedaccordingtoacertainselectioncriterionamongtheavailableantennas.Then,withGroupInterferenceSuppression(GIS)technology,theinterferencesofthetransmitsymbolsfromtheselectedantennascanbesuppressed.Finally,the2ndgrouptransmitantennasaredecidedamongtheresidualavailableantennas.Simulationsshowthatitsperformanceislowerthanthatoftheconventionalselectionscheme.However,thenewselectionschemehaslowercomplexitythantheconventionalone.
简介:Thesubbandstructures,distributionsofelectronandholewavefunctions,statedensity,opticalgainspectra,andtransparencycarrierdensityoftheV-grooveZn1-xCdxSe/ZnSequantumwiresareinvestigatedtheoreticallyusingfourbandeffective-massHamiltonian,whichtakesintoaccounttheeffectsofthevalencebandanisotropyandthebandmixing.Thebiaxialstraineffectforquantumwiresisincludedinthecalculation.ThecompressivestrainintheZn1-xCdxSewireregionincreasestheenergyseparationbetweentheuppermostsubbands.Theopticalgainwithxy-polarizedlightisenhanced,whileopticalgainwithz-polarizedlightisstronglydecreased.Thexy-polarizedopticalgainspectrumhasapeakataround2.541Ev,withthetransparencycarrierdensityof0.75×1018 cm-3.Thecalculatedresultsalsoshowthatthestraintendstoincreasethequantumconfinementandenhancetheanisotropyoftheopticaltransitions.
简介:V型槽侧面耦合是目前双包层光纤抽运光耦合的方法之一。本文提出了一种二透镜光学系统的耦合模型,并利用几何光学的ABCD矩阵分析和计算了透镜焦距与激光二极管阵列(LD—Arrays),透镜,双包层光纤(DCF)三者之间间距的关系,同时通过计算确定了V型槽所开的最佳角度。通过数值模拟计算发现透镜焦距的选取在很小范围内会引起两透镜间距的剧烈变化而且激光二极管与透镜的间距以及两透镜间的间距主要取决于靠近激光二极管那个透镜的焦距大小。本文的分析和计算对V型槽侧面抽运的光学耦合系统中透镜焦距的选取以及LD,透镜,DCF三者之间间距的设置的最优化提供了理论指导。
简介:Inthispaper,buildingtogrid(B2G)andvehicletogrid(V2G)havebeendefinedwithclearandpracticalunderstanding.Bothofthemarenewgenerationtechnologieswhicharetheessentialpartofsmartcitylivingandcrowdenergyclustering.Firstly,anin-detailedoverviewhasbeenprovidedwithanintroductiontoB2GandV2Gfollowedbyahistoricaloverviewandtheoreticalanalysisinrespecttosmartcityplanning.Next,areviewisconductedoncurrentandprevioussmartlivingresearch,whichdealswithB2GandV2G.EfficientB2GandV2Gimplementationsinpracticalcasesthenhavebeendiscussed.Lastly,bothofthesetechnicalprospectshavebeenanalyzedincrowdenergydiagram.
简介:UltraWideBand(UWB)transmissionsareattractiveforlowpower,basebandasynchronousmultipleaccessandpeer-to-peerwirelesscommunications.MultipleInputMultipleOutput(MIMO)technologyisusefulincombatingagainstmultipathandatthesametimeimprovessystemperformancebyusingmultielementantennasatbothtransmitterandreceiver.ThisletterproposesatimehoppingM-aryUWBsystemsusingV-BLASTalgorithm,andpowercontrolisconsideredforbetterperformance.Simulationsareprovidedtocompareperformancewithdifferentantennas.