【英文标准名称】:Measurementofliquidflowinopenchannels-Computingstreamflowusinganunsteadyflowmodel
【原文标准名称】:明渠水流测量用不稳定流量模型计算水流流量
【标准号】:ISO/TR11627-1998
【标准状态】:现行
【国别】:国际
【发布日期】:1998-05
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC113
【标准类型】:()
【标准水平】:()
【中文主题词】:速度测量;明渠流动;液体流动;流量测量;流量测量;斜槽
【英文主题词】:flowmeasurement;channelflow;flumes;velocitymeasurement;flowmeasurements;liquidflow
【摘要】:ThisTechnicalReportdescribesamethodforcomputingcontinuousrecordsofstreamflowinanopenchannelthroughthenumericalsolutionoftheone-dimensionalunsteadyflowequations.Suchanapproachistypicallyidentifiedasanunsteadyflowmodelandgenerallyinvolvestheuseofcomputersforsolutionoftheflowequations.Unsteadyflowmodelsareappropriateforcomputingstreamflowrecordsatlocationswhere(1)asingle-valuedstage-dischargerelationdoesnotexist,(2)backwateraffectsthedischargeunderselectedorallconditions,(3)flowsareaffectedbytides,or(4)itisnotpossibletogagetheflowusingvelocity-areamethods.Unsteadyflowmodelsalsoareappropriateforevaluatingtheeffectsofchangesinamanagedflowregimeondownstreamconditionspriortotheimplementationofanychanges.ThisTechnicalReportisapplicabletosteadyandunsteadyflows,tonomineeflows,andtotidalflowsinwhichtherearenosignificantlongitudinalandverticaldensitygradients.Themethodisconsideredequivalentto,orbetterthan,thecommonlyusedstage-fall-dischargetechnique(ISO1100-1:1996,7.2andAnnexC)becausethemethodusesinformationonthephysicalcharacteristicsofthechannel,includingthecross-sectionalgeometry,channelrugosityandchannelslope,andthemethodisbasedonamathematicaldescriptionofthephysicsoffluidflow.ThisTechnicalReportdescribesthetheoreticalbasisandfundamentalassumptionsofthetechnique,andprovidesasummaryofselectednumericalmethodsusedtosolvetheunsteadyflowequations.Alsoprovidedaredetailsontheapplicationofanunsteadyflowmodel,includingdatarequirements,proceduresformodelcalibration,testing,andapplications,andidentificationofuncertaintiesassociatedwiththemethod.ThisTechnicalReportdoesnotprovidesufficientinformationforthedevelopmentofacomputerprogramforsolvingtheunsteadyflowequations,butratherisbasedontheassumptionthatanadequatelydocumentedcomputerprogramisavailable
【中国标准分类号】:A53;P12
【国际标准分类号】:17_120_20
【页数】:23P;A4
【正文语种】:英语


【英文标准名称】:Connectorsforelectricalequipment-Testsandmeasurements-Part25-9:Signalintegritytests-Test25i:Aliencrosstalk
【原文标准名称】:电气设备用连接器.试验和测量.第25-9部分:信号完整性试验.试验25i:不同串音干扰
【标准号】:IEC60512-25-9-2008
【标准状态】:现行
【国别】:国际
【发布日期】:2008-08
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC48B
【标准类型】:()
【标准水平】:()
【中文主题词】:组件;串音衰减;定义;电插头;电气工程;电学测量;机电学;电子工程;电子设备;电子设备及元件;电子仪器;过滤器;阻抗;测量技术;测试
【英文主题词】:Components;Crosstalkattenuation;Definitions;Electricplugs;Electricalengineering;Electricalmeasurement;Electromechanics;Electronicengineering;Electronicequipment;Electronicequipmentandcomponents;Electronicinstruments;Filters;Impedance;Measuringtechniques;Testing
【摘要】:ThispartofIEC60512definesatestmethodwhichisintendedtoassessthenear-endaliencrosstalk(ANEXT)andthefar-endaliencrosstalk(AFEXT)betweenconnectorsincloseproximity,whenmountedintheirmountingsystems.Bothdiscretemodularconnectorsandmulti-portpanelconnectorsmaybetestedusingthismethod.Thismethodprovidesameanstotestthealien(exogenous)crosstalkbetweenanytwoports,aswellasameanstoassesstheoverallaliencrosstalkfromallotherports.Thistestprocedureisgenerallyapplicabletoanyelectricalconnector,andisparticularlysuitabletoconnectorsdescribedinIEC60603-7series,IEC61076-3-104,andothertypesofconnectorsfordatatransmission.
【中国标准分类号】:L23
【国际标准分类号】:31_220_10
【页数】:37P;A4
【正文语种】:英语