BS 9764-1988 经质量评定的无穿透镀膜孔连接的带或不带硬化成份材料的单面或双面挠性印制电路板制造商性能鉴定用分规范
时间:2024-05-03 15:53:29 来源: 标准资料网 作者：标准资料网 阅读：8127
【英文标准名称】:Sectionalspecificationforcapabilityapprovalofmanufacturersofsingle-ordouble-sidedflexibleprintedwiringboardsofassessedqualitywithoutthroughholeconnectionsandwithorwithoutrigidizingcomponentmaterials
【原文标准名称】:经质量评定的无穿透镀膜孔连接的带或不带硬化成份材料的单面或双面挠性印制电路板制造商性能鉴定用分规范
【标准号】:BS9764-1988
【标准状态】:作废
【国别】:英国
【发布日期】:1988-10-31
【实施或试行日期】:1988-10-31
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:印制电路板;双;精整;电子设备及元件;质量保证体系;能力鉴定;厚度;布置;试验条件;试样;金属覆层;统计质量控制;质量管理;式样;旁边;印制电路;认可试验;缺陷与故障;尺寸;抽样方法;验收检验;检验;规范(批准);印制电路基板;单;性能;评估的质量;柔性材料
【英文主题词】:
【摘要】:SpecifiesapplicabletestsandrequirementstakenfromthoselistedinBS9760.Alsotherequirementsforcapabilityapprovalandforqualityconformanceduringmanufacture.
【中国标准分类号】:L30
【国际标准分类号】:31_180
【页数】:40P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforMeasurementofPneumaticPermeabilityofPartiallySaturatedPorousMaterialsbyFlowingAir
【原文标准名称】:用流动空气测定局部饱水孔隙材料气动渗透性的标准试验方法
【标准号】:ASTMD6539-2000(2006)e2
【标准状态】:现行
【国别】:美国
【发布日期】:2000
【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】:D18.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:airflow;flexiblewallpermeameter;permeability;permeameter;pneumaticpermeability;rigidwallpermeameter;Flowingairtest;Partially-saturatedporousmaterials;Pneumaticpermeability;Porousmedia/materials
【摘要】:Thistestmethodappliestotheone-dimensionallaminar(viscous)flowofairinporousmaterialssuchassoil.Note18212;Thistestmethoddealswithporousmaterialswithbothgaseous(air)andliquid(porewater)mobilefluids:Theliquidphaseismuchlesscompressible,hasahigherviscosity,andismuchmoretightlyboundtothesolidphasebychemicalforces.Theassumptionofsingle-phaseflowmaystillbepresumedtobevalidsincethetestgradientensuringtheconditionsoflaminarflowmaybelowenoughthatflowoftheliquidphaseisnegligible.Thedegreeofsaturationofthespecimenshallbelessthanthatwhichwouldproducesignificantinternaltransportofporewateroralterthecontinuityofairvoidsundertheappliedpneumaticgradients.Themaximumpermissibledegreeofsaturationmustbeevaluatedbyanexperiencedanalyst.Innoinstanceshallthespecimenbesosaturatedthatporewaterappearsattheexitofthepermeametercellduringthetest.Thistestmethodisbasedontheassumptionthattherateofmassflowthroughthespecimenisconstantwithtime.Note28212;Whenaspecimencontainsvolatilematerialsthisassumptionisviolated.Themassofgasflowingoutwillbegreaterthanthatflowingin,thepneumaticgradientisindeterminateandthetestmaybecomemeaningless.Suchspecimensposespecialproblemsandmustbedecontaminatedbeforeanalysisinordertominimizehealthandsafetyconcernsandtopreventcontaminationofthetestapparatus.Thepneumaticpermeabilityofporousmaterialsmaybestronglydependentonavarietyofphysicalpropertiesincludingthevoidratio,thedegreeofsaturation,percentanddirectionofcompaction,andsoforth.Itisbeyondthescopeofthistestmethodtoelaboratethesedependencies.Rather,thistestmethodisintendedtobeameasurementtechniquefordeterminingthepneumaticpermeabilityunderacertainsetoflaboratoryconditions.Itistheresponsibilityoftherequestortospecifywhichsoilparametersmustbecontrolledtoensureavalidextensionofthetestresultstofieldconditions.ItisassumedthatDarcy''sLawisvalid.ThevalidityofDarcy''slawmaybeevaluatedbyplottingthevolumetricflowthroughthespecimenagainstthedifferentialpressuredropacrossthespecimen.Iftheindividualtestpointsliewithin25%ofastraightlinepassingthroughtheorigin,thenDarcy''slawmaybetakenasvalid.Note38212;Darcy''slawisvalidonlywhensaturationdoesnotchangeovertime.Longmeasurementtimesassociatedwiththeuseofbubblemetersandmanometersmayindirectlybeanuncontrolledsourceofvariabilitywhenplottingflowversuspressuredrop(see8.2).Therecommendeduseofdigitalelectronicflowandpressuresensorsleadstoconsiderablyreducedmeasurementtimesbecausetheusercanquicklydeterminebyinspectionwhenasteadystateconditionhasbeenreached.Atthatpointonlyasinglereadingneedstobetakenforareliablemeasurement.Arapidcourseofmeasurementwillminimizedehydrationofpartiallysaturatedspecimens.Note48212;Humidifyingthetestgastominimizespecimendehydrationisnotrecommendedbecause:(1)thereisnopracticalwaytoeithermeasureorcontroltherelativehumidityofthetestgas,eitherattheinletoroutletofthespecimen;(2)thecalibrationoftheelectronicflowmeterisfordryaironlyandwouldbecomeunreliableinthepresenceofwatervapor,especiallyinviewofthepotentialforirreversibleadsorptionofmoistureonthesensorelements;(3)thereisadangerofpermanentwatercondensationinthestatictransfer..........
【中国标准分类号】:P13
【国际标准分类号】:13_080_20
【页数】:10P.;A4
【正文语种】:英语
【英文标准名称】:Chimneys-Components-Concreteouterwallelements;GermanversionEN12446:2003
【原文标准名称】:烟囱.元部件.混凝土外壁构件
【标准号】:EN12446-2003
【标准状态】:现行
【国别】:
【发布日期】:2003-08
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:元部件;铰接式接头;监督(认可);合格评定;质量;砖石工程;混凝土元件;测定;表面温度;性能要求;混凝土构件;配件;火炉;等级;定义;数学计算;混凝土;轻质混凝土;烟囱;外壳;生产控制;烟道座;排气系统;设计;质量保证;尺寸;建筑;公差(测量);试验;分类系统;材料;作标记;规范(验收);质量控制;建筑系统构件;表面处理;施工材料;分类;合格;加筋
【英文主题词】:Chimneys;Classes;Classification;Classificationsystems;Components;Concretecomponents;Concreteelement;Concreteproducts;Concretes;Conformity;Conformityassessment;Construction;Constructionmaterials;Constructionsystemsparts;Definition;Definitions;Design;Determinations;Dimensions;Exhaustsystems;Fireplaces;Fittings;Flueblocks;Lightweightconcrete;Marking;Masonry;Materials;Mathematicalcalculations;Outershell;Performancerequirements;Productioncontrol;Quality;Qualityassurance;Qualitycontrol;Reinforcement;Specification(approval);Surfacetemperatures;Surfacetreatment;Surveillance(approval);Testing;Tolerances(measurement)
【摘要】:
【中国标准分类号】:Q72
【国际标准分类号】:91_060_40
【页数】:28P.;A4
【正文语种】:英语