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【英文标准名称】:Informationtechnology—Genericcablingsystems—Part1:Generalrequirements
【原文标准名称】:信息技术.通用布线系统.一般要求
【标准号】:BSEN50173-1-2007
【标准状态】:作废
【国别】:英国
【发布日期】:2007-08-31
【实施或试行日期】:2007-08-31
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:编织外壳;建筑物;布线;电路网络;通信电缆;通讯系统(建筑物);连接工程;连接工艺;铜电缆;数据处理;数据传输;定义;效率;电气工程;电气设备;电磁兼容性;EMC;信息交换;信息技术;装置;场所;办公室设备;光波导;性能;计划;功率容量;特性;防护屏蔽;规范(验收);结构;对称的;系统管理;电信;测试;拓扑学;传输
【英文主题词】:Braidshieldings;Buildings;Cabling;Circuitnetworks;Communicationcables;Communicationsystems(buildings);Connectionengineering;Connectiontechnology;Coppercable;Dataprocessing;Datatransmission;Definition;Definitions;Efficiency;Electricalengineering;Electricalinstallations;Electromagneticcompatibility;EMC;Informationinterchange;Informationtechnology;Installations;Locations;Officeequipment;Opticalwaveguides;Performance;Planning;Power-handlingcapacity;Properties;Shields;Specification(approval);Structure;Symmetrical;Systemmanagement;Telecommunications;Testing;Topology;Transmission
【摘要】:ThisEuropeanStandardspecifies:a)thestructureandconfigurationofthebackbonecablingsubsystemsofgenericcablingsystemswithinthetypesofpremisesdefinedbytheotherstandardsintheEN50173series;b)channelperformancerequirementsinsupportofthestandardsintheEN50173series;c)linkperformancerequirementsinsupportofthestandardsintheEN50173series;d)backbonecablingreferenceimplementationsinsupportofthestandardsintheEN50173series;e)componentperformancerequirementsinsupportofthestandardsintheEN50173series.Safety(electricalsafetyandprotection,opticalpower,fire,etc.)andelectromagneticcompatibility(EMC)requirementsareoutsidethescopeofthisEuropeanStandardandarecoveredbyotherstandardsandregulations.However,informationgiveninthisEuropeanStandardmaybeofassistanceinmeetingthesestandardsandregulations.
【中国标准分类号】:M11
【国际标准分类号】:35_110;33_040_50
【页数】:128P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforRadialCrushingStrength,K,ofPowderMetallurgy(P/M)BearingsandStructuralMaterials
【原文标准名称】:粉末冶金(P/M)承重和结构材料的径向压溃强度K的标准试验方法
【标准号】:ASTMB939-2009
【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】:B09.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:K;materialstrength;PMbearings;radialcrushingstrength;Structuralmaterials;Powdermetallurgy(P/M)materials;Radialcrushing;Radialcrushingforce
【摘要】:TheradialcrushingstrengthtestisadestructiveprocedureusedtodetermineamaterialstrengthcharacteristicofPMbearingsandhollowcylindricaltestspecimens.Thesedatacanbeusedtograde,classify,andevaluatethematerials.ThePMbearingSpecificationsB438andB439requiretheuseofthistestmethodasanacceptancetestforthestrengthofoil-impregnatedsinteredbearings.Thistestmethodmaybeusedbypowderproducersandpartsmanufacturersasalotacceptancetestformetalpowdersandlubricatedpowdermixturesintendedfortheproductionofporousparts.CompaniesinthePMindustryusethistestasamanufacturingcontroltestbecauseitisappropriateforproductionpractices.RadialcrushingstrengthisapropertyofthePMmaterialbutisnotadesignvalue.However,experiencehasshownthattheradialcrushingstrengthofamaterialisapproximatelytwicetheultimatetensilestrength.1.1Thistestmethodcoverstheequipmentandlaboratoryprocedureforthedeterminationoftheradialcrushingstrengthofmaterialsusingeitheraplainpowdermetallurgy(PM)bearingorathin-walledhollowcylindricaltestspecimen.Thisisadestructivetestthatproducesquantitativeresults.1.2Limitations:1.2.1Theprincipleofthisprocedureisbasedonthematerialbeingtestedhavingminimalductility.Thepermanentdeflectionofthecylinderduringthetestshouldnotexceed10%oftheoutsidediameter.1.2.2Theradialcrushingstrengthtestresultsshouldbeusedonlyasaguideifthetestspecimenhasawallthicknessthatisgreaterthanone-thirdoftheoutsidediameter.Thesetestresultsshouldthenonlybeusedforcomparisonwithdatafromthetestspecimensoflikematerialsandsimilardimensions.1.3Withtheexceptionofdensityvalues,forwhichtheg/cm3unitistheindustrystandard,thevaluesstatedininch-poundunitsaretobeconsideredthestandard.ThevaluesinSIunits,showninparenthesishavebeenconvertedinaccordancewithIEEE/ASTMStandardSI10,maybeapproximateandareonlyincludedforinformation.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H72
【国际标准分类号】:77_160
【页数】:3P.;A4
【正文语种】:英语