简介:Alow-lossfiberopticrotaryjoint(FORJ)hasbeendesignedbyusingtwokindsofC-lenscollimators.Itsinsertionlossandinsertionlossvariationduetorotationwithsingle-modefibercollimatorislessthan1.76dBand0.43dBrespectively.Themaximuminsertionlossandcouplingvariationduetorotationwithmulti-modefibercollimatoris1.71dBand0.29dB,respectively.ThiskindofFORJfeatureslowinsertionloss,smallcouplingvariationduetorotationandlowcost.
简介:Thetracking,telemetryandcommand(TT&C)missionisextremelyreliableforitscharactersofsmalltimehorizonandhighredundancy.Thecombinedforcingandfailurebiasing(CFFB)methodthatisusuallyusedforsimulatingtheunreliabilityofthehighlydependablemissionsystemseemsnotsoefficientfortheTT&Cmission.TheconceptabouttheimportanceoffailuretransitionisproposedbasedonthelogicalrelationshipbetweenTT&Cmissionanditsinvolvedresources.Then,theimportanceisusedforreadjustingthetransitionrateofthefailuretransitionwhenusingtheforcingandfailurebiasingduringthesimulation.ExamplesshowthattheimprovedCFFBmethodcanevidentlyincreasetheoccurrenceoftheTT&Cmissionfailureeventanddecreasethesamplevariance.MoreredundancyoftheTT&CmissionleadstotheimprovedCFFBmethodmoreefficient.
简介:Modelingandreasoningondomaincontextsplayakeyroleforaddingintelligencetocommunicationservices,andtheapproachofcapability-basedrequirementengineeringensuresthescientificityandaccuracyofrequirementelicitation.Thispaperpresentsacapability-basedcontextontologymodelingapproachforcommandandcontrol,communication,computer,intelligence,surveillanceandreconnaissance(C4ISR)communication.Primarily,acapability-basedC~4ISRcommunicationmeta-conceptmodelandaC~4ISRcommunicationcontextmeta-ontologyareconstructed.ThecontextontologyisestablishedundertheconstraintsoftheC~4ISRcommunicationcontextmeta-ontology,andfurthermore,algorithmsareproposedtosupportcontextreasoningbasedondescriptionlogic.Acasestudyispresentedtodemonstrateapplicabilityoftheproposedmethod.
简介:TLC320AD50C作为一款语音处理芯片有着广泛的应用。文章介绍了TMS320VC5402的多通道缓冲串口(McBSPs)与音频芯片TLC320AD50C的硬件连接的设计与实现。介绍了TMS320VC5402的多通道缓;中串口和音频芯片TLC320AD50C的工作原理和初始化的方法,以及典型应用中的TMS320VC5402对TLC320AD50C控制方式和TLC320AD50C采样频率的设定。最后给出了该系统的初始化程序,并实现了在硬件系统上的运行。
简介:TheionospherictimedelayisoneofthemainerrorsourcesinC/AcodeGPSnavigationandpositioningapplications.Inthispaper,amethodisproposedforreal-timedual-frequencyionospherictime-delaycorrectingusingaC/AcodeGPSreceiver,andtheprincipleofthecircuitblockdiagramforthismethodisanalyzedwithitsfeasibilitytheoreticallydemonstrated.
简介:Aneworganicsemiconductortartaricaciddopedsaltofemeraldinepolyaniline(PANI-C4H6O6)hasbeenobtainedbythemethodofoxidativepolymerizationofmonomericanilinewithammoniumpersulfateinacidicsolution.ThestructurewascharacterizedbyFourierTransformInfraredtechnique(FTIR)andX-raydiffraction(XRD).Thetemperaturedependencedcconductivityδdc(T)showsasemiconductorbehaviorandfollowsthequasionedimensionalvariablerangehopping(Q1D-VRH)model.Dataonδdc(T)arealsodiscussed.
简介:Inrecentyears,microstripantennashavebeenmorewidelyappliedinsatellitecommunications,mobilephones,unmannedaerialvehicle(UAV),andweapons.Amicro-electro-mechanicalsystems-based(MEMS-based)high-resistancesiliconC-bandmicrostripantennaarrayhasbeendesignedfortheintelligentammunition.Thecenterfrequencyis4.5GHz.Acavityhasbeendesignedinsubstratetoreducethedielectricconstantofsiliconandhigh-resistancesiliconhasbeenusedasthematerialofsubstratetoimprovethegainofantenna.ItisveryeasytobemanufacturedbyusingMEMStechnologybecauseoftheimprovedstructureoftheantenna.Theresultsshowthatthegainoftheantennais8dBandvoltagestandingwaveratio(VSWR)islessthan2bytheanalysisandsimulationinhighfrequencystructuresimulator(HFSS).
简介:Inthiswork,ahardwareintrusiondetectionsystem(IDS)modelanditsimplementationareintroducedtoperformonlinereal-timetrafficmonitoringandanalysis.TheintroducedsystemgatherssomeadvantagesofmanyIDSs:hardwarebasedfromimplementationpointofview,networkbasedfromsystemtypepointofview,andanomalydetectionfromdetectionapproachpointofview.Inaddition,itcandetectmostofnetworkattacks,suchasdenialofservices(DoS),leakage,etc.fromdetectionbehaviorpointofviewandcandetectbothinternalandexternalintrudersfromintrudertypepointofview.GatheringthesefeaturesinoneIDSsystemgiveslotsofstrengthsandadvantagesofthework.Thesystemisimplementedbyusingfieldprogrammablegatearray(FPGA),givingamoreadvantagestothesystem.AC5.0decisiontreeclassifierisusedasinferenceenginetothesystemandgivesahighdetectionratioof99.93%.
简介:<正>英飞凌科技股份公司推出全新的650VCoolMOSTMC6/E6高性能功率MOSFET系列。该产品系列将现代超级结(SJ)器件的优势(如低导通电阻和低容性开关损耗)与轻松控制的开关行为及体二极管高牢固性融合在一起。基于同样的技术平台,C6器件针对易用性进行了优化,而E6器件则旨在提供最高效MOSFET系列。该产品系列将现代超级结(SJ)器件的优势(如低导通电阻和低容性开关损耗)与轻松控制的开关行为及体二极管高牢固性融合在一起。基于同样的技术平台,C6器件针对易用性进行了优化,而E6器件则旨在提供最高效率。CoolMOSTMC6/E6是来自英飞凌的第六代市场领先的高压超级结功率MOSFET。全新的650VCoolMOSTMC6/E6器件具备快速、可控的开关性能,适用于效率和功率密度是关键要求的应用。650VCoolMOSTMC6/E6器件易于应用,是各种高能效开关产品的理想之选,例如笔记本电脑适配器、太阳能逆变器和其他需要额外击穿电压裕量的开关电源(SMPS)产品。相对于CoolMOSTMC3650V系列,全新650VCoolMOSTMC6/E6器件输出电容(Eoss)的储电量降幅高达20%,而C6/E6器件经过改进的体二极管具备更高的硬换相耐受性,并可使反向恢复电荷降低约25%。得益于调谐栅极电阻的平衡设计,C6/E6器件的开关行为能够避免过高的电压和电流变化率。邹勉摘编
简介:Inthispaper,wedemonstratetheacetylehe(C2H2)sensorwithhighsensitivityusingahollow-corephotonicbandgapfiber(HC-PCF).ExperimentsformeasuringC2H2concentrationsingasmixtureareperformed.Usinga2m-longHC-PCFasgascell,thespectrumofacetyleneatn1+n3bandhasbeenmeasured,andtheP11-branchhasbeenselectedforthepurposeofsensing.Aminimumdetectivityof143partspermillionbyvolume(ppmv)forthesystemconfigurationisestimated.