SAE AMS7233 Rivets, Solid, Alloy-Corrosion Resistant, 67ni 31cu (Cancelled Jan 1991)
时间:2024-05-11 19:43:23 来源: 标准资料网 作者：标准资料网 阅读：9008
Product Code:SAE AMS7233
Title:Rivets, Solid, Alloy-Corrosion Resistant, 67ni 31cu (Cancelled Jan 1991)
Issuing Committee:
Scope:
【英文标准名称】:Digitalcellulartelecommunicationssystem(Phase2).BaseStationController.BaseTransceiverStation(BSC-BTS)interface.Layer2specification(GSM08.56).
【原文标准名称】:蜂窝式数字电信系统(第2段).基础站控制器.收发两用基础站(BSC-BTS)接口.层2规范(GSM08.56)
【标准号】:NFZ83-595-1998
【标准状态】:现行
【国别】:法国
【发布日期】:1998-12-01
【实施或试行日期】:1998-12-05
【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】:通信系统;地面流动服务设施;无线电话业务;移动无线电通信系统;公共的;物理层;欧洲的;数字的;终端装置;界面;电信;远程通信;无线通信业务;基础站;接口(数据处理);通信网;电信设备
【英文主题词】:
【摘要】:
【中国标准分类号】:M14
【国际标准分类号】:33_070_50
【页数】:14P;A4
【正文语种】:其他
【英文标准名称】:StandardPracticeforPerformingAcceleratedOutdoorWeatheringofNonmetallicMaterialsUsingConcentratedNaturalSunlight
【原文标准名称】:使用集中自然光对非金属材料进行加速室外候化的标准实施规程
【标准号】:ASTMG90-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:G03.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:durability;exposure;fresnel-reflector;weathering;Acceleratedaging/testing--buildingmaterials;Acceleratedweathering;Durability--paints/relatedmaterials;Exposuretests--atmospheric;Fresnel-reflectorsystem;Mirrors;Nonmetallicmaterials;Outdoo
【摘要】:Resultsobtainedfromthispracticecanbeusedtocomparetherelativedurabilityofmaterialssubjectedtothespecifictestcycleused.Noacceleratedexposuretestcanbespecifiedasatotalsimulationofnaturalorfieldexposures.Resultsobtainedfromthispracticecanbeconsideredasrepresentativeofnaturalorfieldexposuresonlywhenthedegreeofcomparativeperformancehasbeenestablishedforthespecificmaterialsbeingtested.TherelativedurabilityofmaterialsinnaturalorfieldexposurecanbeverydifferentdependingonthelocationoftheexposurebecauseofdifferencesinUVradiation,timeofwetness,temperature,pollutants,andotherfactors.Therefore,evenifresultsfromaspecificacceleratedtestconditionarefoundtobeusefulforcomparingtherelativedurabilityofmaterialsexposedinaparticularexteriorlocation,itcannotbeassumedthattheywillbeusefulfordeterminingrelativedurabilityforadifferentlocation.Theuseofasingleaccelerationfactorrelatingtherateofdegradationinthisacceleratedexposuretotherateofdegradationinaconventionalexteriorexposureisnotrecommendedbecausetheaccelerationfactorvarieswiththetypeandformulationofthematerial.Eachmaterialandformulationmayresponddifferentlytotheincreasedlevelofirradianceanddifferencesintemperatureandhumidity.Thusanaccelerationfactordeterminedforonematerialmaynotbeapplicabletoothermaterials.Becauseofvariabilityintestresultsunderbothacceleratedandconventionalexteriorexposuresresultsfromasufficientnumberoftestsmustbeobtainedtodetermineanaccelerationfactorforamaterial.Further,theaccelerationfactorisapplicabletoonlyoneexteriorexposurelocationbecauseresultsfromconventionalexteriorexposurescanvaryduetoseasonalorannualdifferencesinimportantclimaticfactors.Variationsinresultsmaybeexpectedwhenoperatingconditionsvarywithinthelimitsofthispractice.Forexample,therecanbelargedifferencesintheamountofdegradationinasinglematerialbetweenseparate,althoughsupposedlyidentical,exposurescarriedoutforthesamedurationornumberofexposurecycles.Thispracticeisbestusedtocomparetherelativeperformanceofmaterialstestedatthesametimeinthesamefresnelreflectordevice.Becauseofpossiblevariabilitybetweenthesametypeofexposuredeviceandvariabilityinirradiance,temperatureandmoisturelevelsatdifferenttimes,comparingtheamountofdegradationinmaterialsexposedforthesamedurationorradiantenergyatseparatetimesisnotrecommended.Thispracticeshouldnotbeusedtoestablishax201C;pass/failx201D;approvalofmaterialsafteraspecificperiodofexposureunlessperformancecomparisonsaremaderelativetoacontrolmaterialexposedsimultaneously,orthevariabilityinthetestisdefinedsothatstatisticallysignificantpass/failjudgementscanbemade.Itisstronglyrecommendedthatatleastonecontroltestspecimenbeexposedwitheachtest.ThecontroltestspecimenshouldmeettherequirementsofTerminologyG113,andbechosensothatitsfailuremodeisthesameasthatofthetestspecimen.Itispreferabletousetwocontroltestspecimens,onewithrelativelygooddurabilityandonewithrelativelypoordurability.Theuseofatleasttworeplicatesofeachcontroltestspecimenandeachmaterialbeingevaluatedisrecommended.ConsultGuideG169forperformingstatisticalanalysis.1.1Fresnel-reflectingconcentratorsusingthesunassourceareutilizedintheacceleratedoutdoorexposuretestingofnonmetallicmaterials.......
【中国标准分类号】:H25
【国际标准分类号】:
【页数】:11P.;A4
【正文语种】:英语