ANSI/IEEE 802.3at-2009 信息技术标准.系统间通信和信息交换.局域网和城域网.专门要求.第3部分:载波监听多重存取和碰撞检测的访问方法和物理层规范.修改件:经由媒体独立接口(MDI)增强功能的数据终端设备(DTE)

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【英文标准名称】:StandardforInformationTechnology-TelecommunicationsandInformationExchangeBetweenSystems-LocalandMetropolitanAreaNetworks-SpecificRequirements-Part3:CarrierSenseMultipleAccesswithCollisionDetection(CSMA/CD)AccessMethodandPh
【原文标准名称】:信息技术标准.系统间通信和信息交换.局域网和城域网.专门要求.第3部分:载波监听多重存取和碰撞检测的访问方法和物理层规范.修改件:经由媒体独立接口(MDI)增强功能的数据终端设备(DTE)
【标准号】:ANSI/IEEE802.3at-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】:频带宽度;电路网络;通信;通信网;通信规程;通信系统;计算机网络;控制规程;带检测冲突的载波检测多址存取;数据链层;数据处理;数据终端;数据传送;数据传输;数据传输控制规程;数据传输方法;定义;电子数据处理;电气安全;光纤;信息交流;信息交换;信息处理;信息系统;信息技术;接口(数据处理);LAN;局域网;局域电话网;MAN;文电;城域网;城域;多处理机;开式系统;开放系统互连;OSI;性能;物理层;信号电平;信号;电信传输法;电信;试验;传递函数;电压
【英文主题词】:Bandwidths;Circuitnetworks;Communication;Communicationnetworks;Communicationprocedures;Communicationsystems;Computernetworks;Controlprocedures;CSMA/CD;Datalinklayers;Dataprocessing;Dataterminals;Datatransfer;Datatransmission;Datatransmissioncontrolprocedures;Datatransmissionmethods;Definitions;EDP;Electricalsafety;Fibreoptics;Informationexchange;Informationinterchange;Informationprocessing;Informationsystems;Informationtechnology;Interfaces(dataprocessing);LAN;Localareanetworks;Localtelephonenetwork;MAN;Messages;Metropolitanareanetworks;Metropolitanareas;Multiprocessors;Opensystems;Opensystemsinterconnection;OSI;Performance;Physicallayers;Signallevel;Signals;Telecommunicationtransmissionmethods;Telecommunications;Testing;Transferfunctions;Voltage
【摘要】:ThisprojectistoaugmentsthecapabilitiesoftheANSI/IEEEStd802.3standardwithhigherpowerlevelsandimprovedpowermanagementinformation.
【中国标准分类号】:L78
【国际标准分类号】:35_100_10;35_110
【页数】:
【正文语种】:英语


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【英文标准名称】:StandardSpecificationforStainlessSteelSocketHeadCapScrews
【原文标准名称】:不锈钢内六角头有头螺钉标准规范
【标准号】:ASTMF837-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:F16.04
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:
【英文主题词】:corrosionresistant;stainlesssteel;socketheadcapscrews;Headcapscrews;Screws--specifications;Stainlesssteelscrews--specifications;Steelscrews--specifications
【摘要】:1.1Thisspecificationcoversthechemicalandmechanicalrequirementsforstainlesssteelinchsocketheadcapscrew(SHCS)withnominalthread0.060through1.500in.andintendedforuseinapplicationsrequiringgeneralcorrosionresistance.1.2Threegroupsofstainlesssteelalloysarecovered,austeniticGroup1and2andmartensiticGroup5.1.3Fourpropertyconditionsarecovered:austeniticAlloyGroups1and2inanannealedcondition(AF)at85ksimaximum,intwocoldworkedconditions(CW)at80ksiminimum,(CW1)at102ksiminimum,andmartensiticAlloyGroup5inaheattreatedcondition(HT)at160ksiminimum.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thefollowingprecautionarycaveatpertainsonlytothetestmethodportion,Section13,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:J13
【国际标准分类号】:21_060_10
【页数】:8P.;A4
【正文语种】:英语


【英文标准名称】:Reciprocatinginternalcombustionenginedrivenalternatingcurrentgeneratingsets-Measurementofairbornenoisebytheenvelopingsurfacemethod
【原文标准名称】:往复式内燃机驱动交流发电机组.用包络表面法对空气中噪音进行测定
【标准号】:BS7698-10-1999
【标准状态】:现行
【国别】:英国
【发布日期】:1999-01-15
【实施或试行日期】:1999-01-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:往复式发动机;法规;声强;位置;原动机;水路运输工程部件;内燃机;报告;静止的;声学测量;名称与符号;误差修正;易动的;交流发电机;噪声(环境的);准确度;电气设备;发电机;固定的;电机;试验条件
【英文主题词】:Acoustictesting;Acoustics;Definition;Definitions;Internalcombustionengines;Measurementofairbornenoise;Motorgenerator;Noise
【摘要】:ThispartofISO8528definesmeasurementmethodsforthedeterminationofairbornenoiseemittedbyreciprocatinginternalcombustionenginedrivengeneratingsetsinsuchawaythatthetotalofrelevantnoiseemissions,e.g.exhaustandcoolingsystemnoise,togetherwithallothersourcesofenginenoise,areevaluatedonasimilarbasistoyieldcomparableresults.However,whentheexhaustandcoolingsystemsareductedtoaremotesitetheirnoisecontributionisnottobeincludedinthispartofISO8528.Theessentialnoiseemissioncharacteristicvalueisthesoundpowerlevel.TheresultsofmeasurementtakeninaccordancewiththispartofISO8528areclassifiedaseitheraccuracygrade2orgrade3dependingonwhichacousticmeasurementconditionsarecompliedwith.Accuracygrade2(i.e.,engineeringmethodinaccordancewithISO3744)requiresthemeasuringareatobeasubstantiallyacoustic-freefieldoverareflectingplane(withanenvironmentalcorrectionK2A≤2dB)andwithnegligiblebackgroundnoiselevel(backgroundnoisecorrectionK1A≤1,3dB).Accuracygrade3(i.e.surveymethodinaccordancewithISO3746)requirestheenvironmentalcorrectionK2Atobelessorequalthan7dB,andthebackgroundnoisecorrectionK1Atobelessorequalthan3dB.FortheoperationofageneratingsetundersteadyconditionsthispartofISO8528allowsforthecalculationoftheA-weightedsoundpowerlevelaswellasappropriateoctaveoronethirdoctavesoundpowerlevelfortheappropriateaccuracygrade.ThispartofISO8528appliestoRICenginedrivenACgeneratingsetsforfixedandmobileapplicationswithrigidorflexiblemountings.Itisapplicableforlandandmarineuse,excludinggeneratingsetsusedonaircraftortopropellandvehiclesandlocomotives.NOTE1ThispartofISO8528hasbeendevelopedforRICenginedrivenACgeneratingsets,butitcanalsobeappliedtoRICenginedrivenDCgeneratingsets.NOTE2Forsomespecificapplications(e.g.essentialhospitalsupplies,highrisebuildings,etc.)supplementaryrequirementsmaybenecessary.TheprovisionsofthispartofISO8528shouldberegardedasabasis.NOTE3Truecomparisonscanonlybemadebetweengeneratingsetswhenthemeasurementareclassifiedinthesameaccuracygrade.
【中国标准分类号】:K52
【国际标准分类号】:17_140_20;29_160_40
【页数】:22P.;A4
【正文语种】:英语