ANSI/ASTM D5441-2003 用气相色谱法分析甲基特丁基乙醚的试验方法

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【英文标准名称】:TestMethodforAnalysisofMethylTERT-ButylEtherMTBEbyGasChromatography
【原文标准名称】:用气相色谱法分析甲基特丁基乙醚的试验方法
【标准号】:ANSI/ASTMD5441-2003
【标准状态】:作废
【国别】:美国
【发布日期】:2003
【实施或试行日期】:2003-05-10
【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】:甲基乙醚;气相色谱法;分析;甲基;醚;丁烯;试验
【英文主题词】:Analysis;Butylene;Ethers;Gaschromatography;Methyl;Methylether;Testing
【摘要】:Thistestmethodcoversthedeterminationofthepurityofmethyltert-butylether(MTBE)bygaschromatography.ItalsoprovidesaproceduretomeasureimpuritiesinMTBEsuchasCtoColefins,methyl,isopropylandtert-butylalcohols,methylsec-butylandmethyltert-amylethers,acetone,andmethylethylketone.Impuritiesaredeterminedtoaminimumconcentrationof0.02mass%.ThistestmethodisnotapplicabletothedeterminationofMTBEingasoline.WatercannotbedeterminedbythistestmethodandmustbemeasuredbyaproceduresuchasTestMethodD1364andtheresultusedtonormalizethechromatographicvalues.AmajorityoftheimpuritiesinMTBEisresolvedbythetestmethod,however,someco-elutionisencountered.Thistestmethodisinappropriateforimpuritiesthatboilattemperatureshigherthan180?Corforimpuritiesthatcausepoorornoresponseinaflameionizationdetector,suchaswater.ThevaluesstatedinSI(metric)unitsofmeasurementarepreferredandusedthroughoutthestandard.Alternateunits,incommonusage,arealsoprovidedtoimproveclarityandaidtheuserofthistestmethod.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoconsultandestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G17
【国际标准分类号】:71_040_50
【页数】:
【正文语种】:英语

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【英文标准名称】:Informationtechnology-Measurementandratingofperformanceofcomputer-basedsoftwaresystems
【原文标准名称】:信息技术以计算机为基础的软件系统性能的测量和评定
【标准号】:ISO/IEC14756-1999
【标准状态】:现行
【国别】:国际
【发布日期】:1999-11-01
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:计算机技术;文本处理;性能;软件技术;符号;考核;系统;定义;计算机软件;被测量值;信息技术;测量;信息交换;数据处理;评定
【英文主题词】:Computersoftware;Computertechnology;Dataprocessing;Definition;Definitions;Evaluations;Informationinterchange;Informationtechnology;Measuredvalue;Measurement;Performance;Rating;Softwaretechniques;Symbols;Systems;Textprocessings
【摘要】:ThisInternationalStandarddefineshowuserorientedperformanceofcomputer-basedsoftwaresystems(CBSS)maybemeasuredandrated.ACBSSisadataprocessingsystemasitisseenbyitsusers,e.g.byusersatvariousterminals,orasitisseenbyoperationalusersandbusinessusersatthedataprocessingcenter.ACBSSincludeshardwareandallitssoftware(systemsoftwareandapplicationsoftware)whichisneededtorealizethedataprocessingfunctionsrequiredbytheusersorwhatmayinfluencetotheCBSS’stimebehaviour.ThisInternationalStandardisapplicablefortestsofalltimeconstrainedsystemsorsystemparts.Alsoanetworkmaybepartofasystemormaybethemainsubjectofatest.ThemethoddefinedinthisInternationalStandardisnotlimitedtospecialcaseslikeclassicbatchorterminal-hostsystems,e.g.alsoincludedareclientserversystemsor,withabroadercomprehensionofthedefinitionof‘task‘,realtimesystems.Butthepracticabilityoftestsmaybelimitedbytheexpenditurerequiredtotestlargeenvironments.ThisInternationalStandardspecifiesthekeyfiguresofuserorientedperformancetermsandspecifiesamethodofmeasuringandratingtheseperformancevalues.Thespecifiedperformancevaluesarethosewhichdescribetheexecutionspeedofuserorders(tasks),namelythetripleof:-executiontime,-throughput,-timeliness.Theuserorders,subsequentlycalledtasks,maybeofsimpleorcomplexinternalstructure.Ataskmaybeajob,transaction,processoramorecomplexstructure,butwithadefinedstartandenddependingontheneedsoftheevaluator.WhenevaluatingtheperformanceitispossibletousethisInternationalStandardformeasuringthetimebehaviourwithreferencetobusinesstransactioncompletiontimesinadditiontootherindividualresponsetimes.Theratingisdonewithrespecttousersrequirementsorbycomparingtwoormoremeasuredsystems(typesorversions).Intentionallynoproposalsformeasuringinternalvalues,suchas:-utilisationvalues,-meaninstructionrates,-pathlengths,-cachehitrates,-queuingtimes,-servicetimes,aregiven,becausethedefinitionofinternalvaluesdependsonthearchitectureofthehardwareandthesoftwareofthesystemundertest.ContrarytothistheuserorientedperformancevalueswhicharedefinedinthisInternationalStandardareindependentofarchitecture.Thedefinitionofinternalperformancevaluescanbedoneindependentlyfromthedefinitionofuserorientedperformancevalues.Theymaybeusedandcanbemeasuredinadditiontotheuserorientedperformancevalues.Alsothedefinitionoftermsfortheefficiencywithwhichtheuserorientedvaluesareproducedcanbedonefreely.InadditionthisInternationalStandardgivesguidanceonhowtoestablishatadataprocessingsystemastableandreproduciblestateofoperation.Thisreproduciblestatemaybeusedtomeasureotherperformancevaluessuchastheabovementionedinternalvalues.ThisInternationalStandardfocuseson:-applicationsoftware;-systemsoftware;-turn-keysystems(?.e.systemsconsistingofanapplicationsoftware,thesystemsoftwareandthe-generaldataprocessingsystems.hardwareforwhichitwasdesigned);ThisInternationalStandardspecifiestherequirementsforanemulation(byatechnicalsystem-theso-calledremoteterminalemulator(RTE)-ofuserinteractionswithadataprocessingsystem.Itistheguidelineforpreciselymeasuringandratingtheuserorientedperformancevalues.ItprovidestheguidelineforestimatingthesevalueswiththerequiredaccuracyandrepeatabilityofCBSSswithdeterministicaswellasrandombehaviourofusers.ItisalsoaguidanceforimplementingaRTEorprovingwhetheritworksaccordingtothisInternationalStandard.
【中国标准分类号】:L77
【国际标准分类号】:35_080
【页数】:56P.;A4
【正文语种】:英语