【英文标准名称】:MethodsofDesignatingandMeasuringAperturesandRelatedQuantitiesPertainingtoPhotographicObjectivesandProjectionLenses
【原文标准名称】:摄影镜头和放映机镜头的孔径和相关数值的标识和测量方法
【标准号】:ANSIPH3.29-1958
【标准状态】:作废
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【发布单位】:美国国家标准学会(US-ANSI)
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【标准类型】:()
【标准水平】:()
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【英文标准名称】:StandardTestMethodforDeterminationofRolledErosionControlProduct(RECP)PerformanceinProtectingHillslopesfromRainfall-InducedErosion
【原文标准名称】:防止山坡降雨引起侵蚀的轧制冲刷控制产品(RECP)性能的测定用标准试验方法
【标准号】:ASTMD6459-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D18.25
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:毯子;控制;测定;侵蚀;冲刷控制;性能;降雨;沉积物;土壤;试验方法
【英文主题词】:coverandmulch;ECB;erosioncontrol;erosioncontrolblanket;rainfallsimulation;rollederosionproduct;RECPrunoff;sediment;soilloss
【摘要】:ThistestmethodevaluatesRECPsandtheirmeansofinstallationto:5.1.1Reducesoillossandsedimentconcentrationsinstormwaterrunoffunderconditionsofvaryingrainfallintensityandsoiltype,and;5.1.2Improvewaterqualityexitingtheareadisturbedbyearthworkactivitybyreducingsuspendedsolids.Thistestmethodmodelsandexaminesconditionstypicallyfoundonconstructionsitesinvolvingearthworkactivitiesincluding:highwayandroads;airports;residential,commercialandindustrialdevelopments;pipelines,mines,andlandfills;golfcourses;etc.Thistestmethodisaperformancetest,butcanbeusedforqualitycontroltodetermineproductconformancetoprojectspecifications.Cautionisadvisedsinceinformationregardinglaboratoryspecificprecisionisincomplete.Forprojectspecificconformance,uniqueproject-specificconditionsshouldbetakenintoconsideration.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspections/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoverstheguidelines,requirementsandproceduresforevaluatingtheabilityofRolledErosionControlProducts(RECPs)toprotecthillslopesfromrainfall-inducederosion.CriticalelementsofthisprotectionaretheabilityoftheRECPto:1.1.1Absorbtheimpactforceofraindrops,therebyreducingsoilparticlelooseningthrough"splash"mechanisms;1.1.2Slowrunoffandencourageinfiltration,therebyreducingsoilparticledisplacementandtransportthrough"overlandflow"mechanisms;1.1.3Absorbshearforcesofoverlandflow;and,1.1.4Trapsoilparticlesbeneath.1.2Thistestmethodutilizesfull-scaletestingprocedures,ratherthanreduced-scale(bench-scale)simulation,andispatternedafterconditionstypicallyfoundonconstructionsitesattheconclusionofearthworkoperations,butpriortothestartofrevegetationwork.Thereforethisconsidersonlyunvegetatedconditions.1.3ThistestmethodprovidesacomparativeevaluationofanRECP-tobaselinebaresoilconditionsundercontrolledanddocumentedconditions.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunits,whichareprovidedforinformationonlyandarenotconsideredstandard.1.5AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026,unlesssupersededbythisstandard.1.5.1Theproceduresusedtospecifyhowdataarecollected/recordedorcalculated,inthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproceduresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsfortheuser''sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalyticalmethodsforengineeringdesign.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibility......
【中国标准分类号】:P58
【国际标准分类号】:13_080_01
【页数】:10P.;A4
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