ANSI/ASTM D7212-2007 利用低比对正比计数器能量散射X-射线荧光光谱法测量汽车燃料中低硫含量的试验方法
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【英文标准名称】:TestMethodforLowSulfurinAutomotiveFuelsbyEnergy-DispersiveX-RayFlurosecenceSpectrometryUsingALow-BackgroundProportionalCounter
【原文标准名称】:利用低比对正比计数器能量散射X-射线荧光光谱法测量汽车燃料中低硫含量的试验方法
【标准号】:ANSI/ASTMD7212-2007
【标准状态】:作废
【国别】:美国
【发布日期】:2007
【实施或试行日期】:2007-05-22
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:机动车燃料;背景;计数器;能量;低硫;正比计数器;测试;X射线;X射线荧光;X射线荧光光谱法;X射线光度法
【英文主题词】:Automotivefuels;Background;Counters;Energy;Low-sulphur;Proportionalcounters;Testing;X-ray;X-rayfluorescence;X-rayfluorescencespectrometry;X-rayspectrometry
【摘要】:Thistestmethodspecifiesanenergy-dispersiveX-rayfluorescence(EDXRF)methodforthedeterminationofthetotalsulfurcontentofautomotivefuelswithaconcentrationrangefrom7mg/kgto50mg/kg.Thepooledlimitofquantitationofthistestmethodasobtainedbystatisticalanalysisofinterlaboratorytestresultsis7mg/kgsulfur.ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thepreferredconcentrationunitsaremg/kgsulfur.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E31
【国际标准分类号】:75_160_20
【页数】:
【正文语种】:英语
Product Code:SAE AMS7270
Title:Rings, Sealings, Butadiene-Acrylonitrile (NBR) Rubber Fuel Resistant 65 - 75
Issuing Committee:Ams Ce Elastomers Committee
Scope:This specification covers a butadiene-acrylonitrile (NBR) rubber in the form of molded rings.【英文标准名称】:Opticalfibres-Part1-41:Measurementmethodsandtestprocedures-Bandwidth
【原文标准名称】:光纤.第1-41部分:测量方法和试验规程.频带宽度
【标准号】:IEC60793-1-41-2010
【标准状态】:现行
【国别】:国际
【发布日期】:2010-08
【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/SC86A
【标准类型】:()
【标准水平】:()
【中文主题词】:频带宽度;定义;尺寸规格;电气工程;光纤;频率;频率范围;测量;测量技术;动量;多模纤维;光学测量;光波导;特性;脉冲失真;抽样方法;试验;试验装置
【英文主题词】:Bandwidths;Definitions;Dimensions;Electricalengineering;Fibreoptics;Frequencies;Frequencyranges;Measurement;Measuringtechniques;Momentum;Multimodefibres;Opticalmeasurement;Opticalwaveguides;Properties;Pulsedistortion;Samplingmethods;Testing;Testingdevices
【摘要】:ThispartofIEC60793describesthreemethodsfordeterminingandmeasuringthemodalbandwidthofmultimodeopticalfibres(seeIEC60793-2-10,IEC60793-30seriesandIEC60793-40series).Thebasebandfrequencyresponseisdirectlymeasuredinthefrequencydomainbydeterminingthefibreresponsetoasinusoidalymodulatedlightsource.Thebasebandresponsecanalsobemeasuredbyobservingthebroadeningofanarrowpulseoflight.Thecalculatedresponseisdeterminedusingdifferentialmodedelay(DMD)data.Thethreemethodsare:?MethodA–Timedomain(pulsedistortion)measurement?MethodB–Frequency-domainmeasurement?MethodC–Overfilledlaunchmodalbandwidthcalculatedfromdifferentialmodedelay(OMBc)MethodsAandBcanbeperformedusingoneoftwolaunches:anoverfilledlaunch(OFL)conditionorarestrictedmodelaunch(RML)condition.MethodCisonlydefinedforA1a.2(andA1a.3inpreparation)multimodefibreandusesaweightedsummationofDMDlaunchresponseswiththeweightscorrespondingtoanoverfilledlaunchcondition.Therelevanttestmethodandlaunchconditionshouldbechosenaccordingtothetypeoffibre.
【中国标准分类号】:M33
【国际标准分类号】:33_180_10
【页数】:64P.;A4
【正文语种】:英语