【英文标准名称】:StandardTestMethodforMeasuringtheCoefficientofRetroreflectedLuminance(RL)ofPavementMarkingsinaStandardConditionofContinuousWetting
【原文标准名称】:连续浸润标准条件内路面标记反射亮度(R)系数测量的标准试验方法
【标准号】:ASTME2176-2001
【标准状态】:现行
【国别】:
【发布日期】:2001
【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】:E12.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:亮度;作标记;测量;路面;降雨;标准状态;试验方法;湿的
【英文主题词】:continuouswetting;dryretroreflection;mobileretroreflectometers;pavementmarkings;portableretroreflectometer;wetretroreflection
【摘要】:Thequalityofthepavementmarkingisdeterminedbythecoefficientofretroreflectedluminance,RL,beitdryorwet,anddependsonthematerialsused,age,andwearpattern.Theseconditionsshallbeobservedandnotedbytheuser.Underidenticalconditionsofheadlightilluminationanddriver’viewing,largervaluesofRLcorrespondtohigherlevelsofvisualperformanceatcorrespondinggeometry.Thepavementmarking’measuredperformanceinconditionsofcontinuouswettingmaybeusedtocharacterizetheperformanceofthemarkingontheroadaswateriscontinuouslyfallingonitandmayberepresentativetoaperiodofrain.Thisperformanceofthemarkingmaybedifferentthanthatexperiencedwhenthemarkingsarejustwetordamp.Retroreflectivityofpavement(road)markingsdegradeswithtrafficwearandrequiresperiodicmeasurementtoensurethatsufficientlinevisibilityisprovidedtodrivers.ForexampleseeSpecificationD6359fordryreflectivityrequirements.Foragivenviewingdistance,measurementsofRLmadewitharetroreflectometerhavingageometrycorrespondingtothatviewingdistanceareagoodindicatorofthevisualrankingofthematerialmeasured.AsspecifiedbyTestMethodE1710,themeasurementgeometryoftheinstrumentisbasedonaviewingdistanceof30m,aneyeheightof1.2mandaheadlightmountingheightof0.65m(seeAppendixX1).Newlyinstalledpavementmarkingsmayhaveanaturalsurfacetensionorreleaseagentswhichpreventthewettingoutoftheproductbyrain/water.Thisphenomenonproducesaninterferencewhenassessingthewetcharacteristicsofapavementmarking.Attempttomeasuremarkingswiththissurfacex201C;non-wettingx201D;ofthewatermaygivehighervalues.Thisconditionisshortlivedandmarkingsthathavebeenontheroadforonemonthormoredonotexhibitthisnon-wetting.Itshallbetheresponsibilityoftheusertoemployaninstrumenthavingthespecifiedobservationandentranceangles.1.1Thistestmethodcoversthemeasurementofthewetretroreflective(RL)propertiesofhorizontalpavementmarkingmaterials,suchastrafficstripesandroadsurfacesymbols,usingaportableormobileretroreflectometerthatcanbeplacedonorbeforetheroadmarkingtomeasuretheretroreflectionattheprescribedgeometry.1.2Thismethodofmeasuringofthewetretroreflectiveproperties(RL)ofpavementmarkingsutilizesamethodofcontinuouslywettingthemarkingduringmeasurementwiththeretroreflectometer(seeFig1).Note18212TestMethodE2177maybeusedtodescribetheperformanceofpavementmarkingsinconditionsofwetnessafteraperiodofrain.1.3ThistestmethodspecifiestheuseofportableormobilereflectometersthatcanmeasurepavementmarkingsperTestMethodE1710.Theentranceandobservationanglesrequiredoftheretroreflectometerinthistestmethodarecommonlyreferredtoas"30metergeometry."1.4Thistestmethodisintendedtobeusedforfieldmeasurementofpavementmarkingsbutmaybeusedtomeasuretheperformanceofmaterialsonsamplepanelsbeforeplacingthemarkingmaterialinthefield.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:R10
【国际标准分类号】:93_080_20
【页数】:5P.;A4
【正文语种】:


【英文标准名称】:Superconductivity-Part3:Criticalcurrentmeasurement-DCcriticalcurrentofAg-and/orAgalloy-sheathedBi-2212andBi-2223oxidesuperconductors(IEC61788-3:2006);GermanversionEN61788-3:2006
【原文标准名称】:超导性.第3部分:临界电流测量.银和/或银套Bi-2122Bi2123氧化超导体的DC临界电流
【标准号】:DINEN61788-3-2007
【标准状态】:现行
【国别】:德国
【发布日期】:2007-03
【实施或试行日期】:2007-03-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:成束导线;装箱;临界数据;电流测量;定义;直流电流;电气工程;测量;测量技术;护套的;护壳;银;银涂层;试样制备;超导性;超导体;试验;试验条件
【英文主题词】:
【摘要】:
【中国标准分类号】:A55
【国际标准分类号】:17_220_20;29_050
【页数】:28P.;A4
【正文语种】:德语