ASTM C226-2007 制造加气水凝水泥用加气剂的标准规范

上一篇: ASTM D7313-2007a 用盘状紧凑拉伸几何物测定地沥青集料混合物断裂强度的标准试验方法
下一篇: ASTM C1386-2007 预制增压加气混凝土墙(PAAC)建筑部件的标准规范

【英文标准名称】:RadioEquipmentandSystems(RES).Technicalcharacteristicsandmethodsofmeasurementformaritimefloat-freesatelliteEmergencyPositionIndicatingRadioBeacon(EPIRB)operatinginthe1,6GHzbandthroughgeostationarysatellites.
【原文标准名称】:无线电设备和系统(RES).在1,6GHZ频带到与地球位置保持相对不变的卫星内指示无线电信标操作的自由漂浮卫星紧急位置的测量方法和技术特性(欧洲远程通信标准ETS300372)
【标准号】:NFZ84-372-1999
【标准状态】:现行
【国别】:法国
【发布日期】:1999-04-01
【实施或试行日期】:1999-04-20
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:通信;电信;电信;远程通信;无线电工程;;测量技术;卫星通信;船舶用无线电通信设备;移动无线电通信系统;无线电设备
【英文主题词】:
【摘要】:
【中国标准分类号】:M36
【国际标准分类号】:33_060_20
【页数】:30P;A4
【正文语种】:其他


【英文标准名称】:StandardGuideforStatisticalAnalysisofAcceleratedServiceLifeData
【原文标准名称】:加速运行的寿命数据的统计分析指南
【标准号】:ASTMG172-2003(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:G03.08
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:Acceleratedservicelifedata;Statisticalmethods
【摘要】:Thenatureofacceleratedservicelifeestimationnormallyrequiresthatstresseshigherthanthoseexperiencedduringserviceconditionsareappliedtothematerialbeingevaluated.Fornon-constantusestress,suchasexperiencedbytimevaryingweatheroutdoors,itmayinfactbeusefultochooseanacceleratedstressfixedatalevelslightlylowerthan(say90%of)themaximumexperiencedoutdoors.Bycontrollingallvariablesotherthantheoneusedforacceleratingdegradation,onemaymodeltheexpectedeffectofthatvariableatnormal,orusageconditions.Iflaboratoryacceleratedtestdevicesareused,itisessentialtoprovideprecisecontrolofthevariablesusedinordertoobtainusefulinformationforservicelifeprediction.Itisassumedthatthesamefailuremechanismoperatingatthehigherstressisalsothelifedeterminingmechanismattheusagestress.Itmustbenotedthatthevalidityofthisassumptioniscrucialtothevalidityofthefinalestimate.Acceleratedservicelifetestdataoftenshowdifferentdistributionshapesthanmanyothertypesofdata.Thisisduetotheeffectsofmeasurementerror(typicallynormallydistributed),combinedwiththoseuniqueeffectswhichskewservicelifedatatowardsearlyfailuretime(infantmortalityfailures)orlatefailuretimes(agingorwear-outfailures).Applicationsoftheprinciplesinthisguidecanbehelpfulinallowinginvestigatorstointerpretsuchdata.Thechoiceanduseofaparticularaccelerationmodelandlifedistributionmodelshouldbebasedprimarilyonhowwellitfitsthedataandwhetheritleadstoreasonableprojectionswhenextrapolatingbeyondtherangeofdata.Furtherjustificationforselectingmodelsshouldbebasedontheoreticalconsiderations.Note28212;Acceleratedservicelifeorreliabilitydataanalysispackagesarebecomingmorereadilyavailableincommoncomputersoftwarepackages.Thismakesdatareductionandanalysesmoredirectlyaccessibletoagrowingnumberofinvestigators.Thisisnotnecessarilyagoodthingastheabilitytoperformthemathematicalcalculation,withoutthefundamentalunderstandingofthemechanicsmayproducesomeseriouserrors.SeeRef(1).1.1Thisguidebrieflypresentssomegenerallyacceptedmethodsofstatisticalanalysesthatareusefulintheinterpretationofacceleratedservicelifedata.Itisintendedtoproduceacommonterminologyaswellasdevelopingacommonmethodologyandquantitativeexpressionsrelatingtoservicelifeestimation.1.2ThisguidecoverstheapplicationoftheArrheniusequationtoservicelifedata.Itservesasageneralmodelfordeterminingratesatusageconditions,suchastemperature.Itservesasageneralguidefordeterminingservicelifedistributionatusagecondition.Italsocoversapplicationswheremorethanonevariableactsimultaneouslytoaffecttheservicelife.Forthepurposesofthisguide,theaccelerationmodelusedformultiplestressvariablesistheEyringModel.Thismodelwasderivedfromthefundamentallawsofthermodynamicsandhasbeenshowntobeusefulformodelingsometwovariableacceleratedservicelifedata.Itcanbeextendedtomorethantwovariables.1.3Onlythosestatisticalmethodsthathavefoundwideacceptanceinservicelifedataanalyseshavebeenconsideredinthisguide.1.4TheWeibulllifedistributionisemphasizedinthisguideandexamplecalculationsofsituationscommonlyencounteredinanalysisofservicelifedataarecoveredindetail.ItistheintentionofthisguidethatitbeusedinconjunctionwithGuideG166.1.5Theaccuracyofthemodelbecomesmorecriticalasthenumberofv......
【中国标准分类号】:A41
【国际标准分类号】:03_120_30
【页数】:12P.;A4
【正文语种】:英语