BS 5540-1-1978 评定液压油颗粒物污染规范.第1部分:样品容器清洁方法的鉴定与检验

上一篇: BS 4459-1978 石油产品和润滑剂粘度指数的动态粘度计算法
下一篇: BS 5540-3-1978 评定液压油颗粒物污染规范.第3部分:瓶装油液取样方法

【英文标准名称】:DigitalBroadbandDeliverySystem:OutofBandTransportPart2:ModeB
【原文标准名称】:数字宽频传送系统:带外传输.第2部分:B模式
【标准号】:ANSI/SCTE55-2-2002
【标准状态】:作废
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Broadbandsystems;Communicationtechnology;Datatransmission;Delivery;Digitalsignals;Transmissiontechnique;Transport
【摘要】:DVS167:SpecificationofQuadruaturePhase-ShiftKey(QPSK)out-of-bandchannelsbasedonDAVIC
【中国标准分类号】:M11
【国际标准分类号】:33_060_40
【页数】:
【正文语种】:英语


【英文标准名称】:StandardPracticeforFluorescentUltraviolet(UV)ExposureofPhotodegradablePlastics
【原文标准名称】:照相级塑料制品的荧光紫外线曝光的标准实施规程
【标准号】:ASTMD5208-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D20.96
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:degradation;exposure;fluorescentUV;lightexposure;ultraviolet;Degradation--plastics;FluorescentUV-lightapparatus;Lightexposure--plastics;Photodegradation;Ultraviolet(UV)analysis--plastics;NumberCode83.080.01(Plastingeneral)
【摘要】:Materialsmadefromphotodegradableplasticsareintendedtoshowrelativelyrapiddeteriorationofchemical,physical,andmechanicalpropertieswhenexposedtolight,heat,andwaterafterfulfillingtheirintendedpurpose.Thispracticeisintendedtoinducepropertychangesassociatedwithconditionsthatmightbeexperiencedwhenthematerialisdiscardedaslitter,includingtheeffectsofsunlight,moisture,andheat.Theexposureusedinthispracticeisnotintendedtosimulatethedeteriorationcausedbylocalizedweatherphenomenasuchasatmosphericpollution,biologicalattack,andsaltwaterexposure.Cautions8212;Variationinresultsmaybeexpectedwhenoperatingconditionsarevariedwithintheacceptedlimitsofthispractice.Therefore,noreferencetotheuseofthispracticeshouldbemadeunlessaccompaniedbyareportpreparedinaccordancewithSection9thatdescribesthespecificoperatingconditionsused.RefertoPracticeG151fordetailedinformationonthecaveatsapplicabletouseofresultsobtainedinaccordancewiththispractice.Note38212;Additionalinformationonsourcesofvariabilityandonstrategiesforaddressingvariabilityinthedesign,executionanddataanalysisoflaboratoryacceleratedexposuretestsisfoundinGuideG141.Exposureofasimilarmaterialofknownperformance(acontrol)atthesametimeasthetestspecimensprovidesastandardforcomparativepurposes.Useofacontroltorankthestabilityoftestmaterialsgreatlyimprovesagreementbetweendifferentlaboratories.,Itisrecommendedthatatleastthreereplicatesofeachmaterialevaluatedbeexposedtoallowforstatisticalevaluationofresults.TestresultswilldependuponthecarethatistakentooperatetheequipmentinaccordancewithPracticeG154.Significantfactorsincluderegulationoflinevoltage,temperatureoftheroominwhichthedeviceoperates,temperaturecontrol,andconditionandageofthelamps.1.1ThispracticecoversthespecificproceduresapplicableforfluorescentUltraviolet(UV)exposureofphotodegradableplasticsconductedinaccordancewithPracticesG151andG154.Thispracticealsocoversthepreparationoftestspecimensandtheevaluationoftestresults.Note18212;PreviousversionsofthispracticereferencedfluorescentUVdevicesdescribedbyPracticeG53,whichdescribedveryspecificequipmentdesigns.PracticeG53hasbeenwithdrawnandreplacedbyPracticeG151,whichdescribesperformancecriteriaforallexposuredevicesthatuselaboratorylightsourcesandbyPracticeG154,whichgivesrequirementsforexposingnonmetallicmaterialsinfluorescentUVdevices.1.2PracticeD4329coversfluorescentUVexposuresofplasticsintendedforlongtermuseinoutdoorapplications.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note28212;ThereisnoknownISOequivalenttothispractice.
【中国标准分类号】:G31
【国际标准分类号】:
【页数】:5P.;A4
【正文语种】:英语