学科分类
/ 4
75 个结果
  • 简介:Languageisatthecenterofhumanlife.Thisessaytriestoseeksimilaritiesanddifferencesbetweenlanguageacquisitionandlanguagelearningfromthetheoryachievementsofsomelinguists.Onthisbasis,itispointedoutthatlanguageacquisitionistheeffectofsubconsciousness,whilelanguagelearningisconnectedwithconscioussystem.TherebythispaperanalyzestheinteractionbetweenthemandtheinfluenceonthepresentsituationofforeignlanguageteachinginChina.

  • 标签: 语言习得 语言学习 英语教学 交互作用 中国
  • 简介:UpgradeofGoosyDataAcquisitionSystem¥WangShujin;WangYanyu;XingJianping;GuoTianruiandJiaoDunpangAdataacquisitionsystemnamedGoos...

  • 标签:
  • 简介:TheBaBardataacquisitionsystem(DAQ)transportsdatafromthedetectorfrontendeletronicstoshorttermdiskstorage.Amonitoringapplication(VMON)hasbeendevelopedtomonitortheonehundredandninetycomputersinthedataflowsystem.PerformanceinformationforeachCPUiscollectedandmulticastacrosstheexistingdatatransportnetwork.ThepacketsarecurrentlycollectedbyasingleUNIXworkstationandarchived.AROOTbasedGUIprovidescontrolanddisplaystheDAQperformanceinrealtime.ThesameGUIisreusedtorecoverarchivedVMONdata,VMONhasbeendeployedandconstantlymonitorstheBaBardataflowsystem.Ithasbeenusedfordiagnosticsandprovidesinputtomodelsprojectingfutureperformance.Theapplicationhasnomeasurableimpactondatataking,respondsinstantaneouslyonthehumantimescaletorequestsforinformationdisplay,andusesonly3%ofa300MHzSunUltra5CPU.

  • 标签: BaBar实验 数据传输 探测器
  • 简介:Powerfulmainstreamcomputingequipmentandtheadventofaffordablemulti-Gigabitcommunicationtechnologyallowustotackledataacquisitionproblemswithclustersofinexpensivecomputers.Suchnetworkstypicallyincorporateheterogeneousplatforms,real-timepartitionsandcustomdevices.Therefore,onemuststriveforasoftwareinfrastructurethatefficientlycombinesthenodestoasingle,unifiedresourcefortheuser,Overallrequirementsforsuchmiddlewarearehighefficiencyandconfigurationflexibility.IntelligentI/O(I2O)isanindustryspecificationthatdefinesaunifrommessagingformatandexecutingmodelforprocessor-enabledcommunicationequipment.Mappingthisconcepttoadistribultedcomputingenvironmentandencapsulatingthedetailsofthespecificationintoanapplication-programmingframeworkallowustoproviderun-timesupportforclusteroperation.Thispapergivesabriefoverviewofaframework.XDAQthatwedesignedandimplementedatCERNfortheCompactMuonSolenoidexperiment'sprototypedataacquisitionsystem.

  • 标签: CMS实验 数据收集 软件
  • 简介:TheCDFexperimentattheFermilabTevatronhasbeensignificantlyupgradedforthecolliderRunⅡ,whichstartedinmarch2001andisscheduledtoalstuntil2006,Instantaneousluminositiesof10^32cm^-2S^-1andaboveareexpected.Adataacquisitionsystemcapableofefficientlyrecordingthedatahasbeenoneofthemostcriticalelementsoftheupgrade.Keyfiguresaretheabilititytodealwiththeshortbunchspacingof132ns.eventsizesoftheorderof250kB,andpermanentloggingof20MB/s,Thedesignofthesystemandexperiencefromthefirstmonthsofdata-takingoperationarediscussed.

  • 标签: CDF实验 数据收集 系统设计
  • 简介:语言习得是指一个人习得语言的过程。儿童与成人之间的区别导致第一语言和第二语言习得的差异。本文从语言认知和情感因素两方面做深入分析,对第一语言和第二语言习得的差异进行比较和对照。

  • 标签: 语言习得 第一语言 第二语言 语言认知 情感因素
  • 简介:Recentdramaticadvancesintechnologiessuchascomputer,datamanagement,andcommunicationhaverevolutionizedthewaygeologistscollect,disseminate,andutilizegeosciencedata.Aftersummarizedthecharacteristicsandfusionofgeo-data,severalmajorfielddatacapturesystemsadoptedinNorthAmericahavebeenintroduced.GeoscienceinformationdisseminationanddistributionviathewebtechnologyandGISpackagehavealsobeendiscussed.Inaddition,multisourcesgeo-dataintegrationandtheirapplicationstomineralexploration,geologicalhazardriskassessment,andnationallandresourcesprotectionandutilizationhavebeenaddressedbyconcreteexamples.

  • 标签: GEOSCIENCE DATA field DATA CAPTURE system
  • 简介:TheANTAREScollaborationisbuildingadeepunderwaterneutrinotelescopetobeimmersedintheMediterraneanSea40kmofftheFrenchcoast.ThisdetectorwillbeabletodetecttheCherenkovlightemittedbymuonsproducedinneutrinointeractionsusingathree-dimensionalmatrixofopticalsensors,Thetelescopewillbemadeofnearly1000oftheseelementaryunitsdistributedoverawideareaofabout0.1km2atanaveragedepthof2400mInordertoreachasub-nanosecondresolutiononlighpulsedetection,signalsfromallOMsareanalyzedanddigitizedlocallybeforebeingsenttoshorethrougha50kmelectro-opticalcable,Front-endelectronics,timealignment(clockdistribution),TriggeringanddataacquistitionforsuchalargeandremotedetectorrepresentarealhallengeandrequiredconsiderableR&Dstudies,Thetechnicalsolutionsadoptedbythecollaborationwillbedescribedandtheirperformancesdiscussed.

  • 标签: 深水下中微中子实验 触发器 数据收集
  • 简介:Selfscanningphotodiodearray(SSPA)isakindofsolidstateimagingsensor.ThesignalprocessingmethodusingaspecialsectorSSPAwasinvestigated.BasedontheprincipleandcharacteristicsofSSPA,asignalacquisitionandprocessingmethodcontrolledbycomputerwasintroduced.Theamplificationofweaksignal,thematchingoftimesequence,thefastpeakholdingwithlowleakage,thehighspeedA/Dconversionandnonlinearcorrectionwerediscussed.ThismethodcanacquirethepeaksignalofeveryringofsectorSSPAwithhighaccuracyandinrealtime.Itcanbeusedtodetectthedistributionofspacelightenergy.

  • 标签: 信号采集 SSPA 信号处理 图像传感器
  • 简介:AseismometerdataacquisitionunithasbeenusedintheChangpingseismicstationtorecordtheoutputofastrainmeter.Theoutputofastrainmeterwassampledatarateof100/secbyseismometeracquisitionfromtheoriginalrateof1perminute.Plentyofhighfrequencysampleddatawasrecorded.Theminutevaluecurvecalculatedfromtheseismometeracquisitionareconsistentwiththatoftheoriginaldatasampledbythestrainacquisitionsystem.Morecompletewaveformswererecordedwithahighersamplingrate,andseismicphaseparameterscalculatedbyusinghighersamplingratestrainseismicwavesarealsoinconsistencywiththeresultsofitspredecessors.SpectraofthestrainseismicwavesarecomparedwiththatofseismicwavesrecordedbyaseismometerintheShisanlingseismicstation,andtheirtrendsarealmostthesame.Besides,somelowerfrequencycomponentsstillexistinstrainseismicwaves.

  • 标签: 数据采集器 地震仪 应变地震波 数据采集单元 地震台站 采样率
  • 简介:FormorethanoneyeartheCLEOⅢexperimentattheCornellelectronpositronstorageringCESRhasaccumulatedPhysicsdatausinga4layersiliconvertexdetectorandanovelringimageCherenkovdetector,alongwithaconventionalDriftchamber,E.M.calorimeterandmuonchambers.BythetimeofCHEP2001theexperimenthasaccumulated10fb^-1ofdata,Thereadoutandmonitoringsystemscontrol,ca.400000electronicchannels.Detectorconfiguration.dataqualityandcomponentmonitoring,runcontrolareonlysomeoftheSlowControltasksthathavetobeperformed.DeployingindustrystandardssuchasCORBA(inter-platformcommunication)Java(remoteaccessviaWebbrowser)andObjectivity(eventandconstantsdatabse)asbuildingblocksofthecomputernetworkhasbeenofcentralimportance.Objectorienteddesignhasenabledtheseamlessintegrationofthemanyindividualcomponents.Inourpresentationwewilldescribeexperienceswiththisdistributedcontrolsystemandgiveareportofthemeasurestakentoobtainahighsystemavailability.

  • 标签: CLEOⅢ实验 计算机控制系统 数据获取