【英文标准名称】:StandardPracticeforCalculatingPrecisionLimitsWhereValuesareCalculatedfromOtherTestMethods
【原文标准名称】:计算已由其他试验方法计算出的值的精确极限值的标准实施规程
【标准号】:ASTMD4460-1997(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【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】:D04.94
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:precisionlimits;standarddeviation;Calculatingtestvalues;Dataanalysis--pavingapplications;Precision;Randomvariables/variation;Statisticalmethods;Variability
【摘要】:Precisionlimitsforatestresultthatiscalculatedbyaddition,subtraction,multiplication,ordivisionoftwoothertestresultsthathavevalidprecisionlimitscanbecalculateddirectly.Thissavesthecostanddelayofconductinganinterlaboratorystudy.Attheheartofstatisticaltheoryistheconceptofafrequencydistributionofarandomvariable.Theprecisionlimitoftherandomvariableisdeterminedbythestandarddeviationofthevariable.Thestandarddeviationofarandomvariablethatisthesum,difference,product,orquotientoftwootherrandomvariablescanbecalculatedsimplysolongastheindividualvariablesareindependentandthestandarddeviationsaresmallrelativetotheirmeanvalues.TheserestrictionsareusuallymetinASTMmethods.Inthosecaseswheretheserestrictionsarenotmet,othermethodscanbeused.Onlycasescomplyingwiththerestrictionsarecoveredinthisstandard.1.1Thispracticecoverstechniquesforcalculatingprecisionlimitswhenvaluesarecalculatedfromtwoothermethodshavingprecisionlimits.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P04
【国际标准分类号】:93_080_20
【页数】:3P.;A4
【正文语种】:英语


【英文标准名称】:Railwayapplications-Track-Switchesandcrossings-Part5:switches.
【原文标准名称】:铁路设施.轨道.铁路侧线和道岔口.第5部分:铁路侧线
【标准号】:NFF52-010-5/IN1-2011
【标准状态】:现行
【国别】:法国
【发布日期】:2011-12-01
【实施或试行日期】:
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Acceptance(approval);Acceptanceinspection;Acceptancespecification;Definitions;Design;Efficiency;Geometry;Levelcrossings;Performance;Permanentways;Pointwork;Railwayapplications;Railwayconstruction;Railwayinstallations;Railways;Specification(approval);Stockrails;Supplyschedule;Switches;Testing;Tolerances(measurement);Tracks(materialshandlingequipment);Travelways;Turnouts
【摘要】:
【中国标准分类号】:S12
【国际标准分类号】:45_080
【页数】:5P;A4
【正文语种】:其他