IEEE 802-2001 局域网和城市区域网.综述及分级结构
时间:2024-05-17 15:14:24 来源: 标准资料网 作者：标准资料网 阅读：9652
【英文标准名称】:StandardforLocalandMetropolitanAreaNetworks:OverviewandArchitectureIEEEComputerSocietyDocument
【原文标准名称】:局域网和城市区域网.综述及分级结构
【标准号】:IEEE802-2001
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国电气电子工程师学会(US-IEEE)
【起草单位】:IEEE
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:developsLocalAreaNetwork(LAN)andMetropolitanAreaNetwork(MAN)standards,mainlyforthelowest2layersoftheISOReferenceModelforOpenSystemsInterconnection(OSI).
【中国标准分类号】:M11
【国际标准分类号】:35_110
【页数】:61
【正文语种】:英语
【英文标准名称】:StandardTestMethodforElectricalIndicationofConcrete''sAbilitytoResistChlorideIonPenetration
【原文标准名称】:混凝土耐氯离子渗透能力的电指示的标准试验方法
【标准号】:ASTMC1202-2010
【标准状态】:现行
【国别】:
【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】:C09.66
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:氯化物含量;腐蚀;除冰器开关
【英文主题词】:chloridecontent;corrosion;deicingchemicals
【摘要】:Thistestmethodcoversthelaboratoryevaluationoftheelectricalconductanceofconcretesamplestoprovidearapidindicationoftheirresistancetochlorideionpenetration.Inmostcasestheelectricalconductanceresultshaveshowngoodcorrelationwithchloridepondingtests,suchasAASHTOT259,oncompanionslabscastfromthesameconcretemixtures(Refs1-5).Thistestmethodissuitableforevaluationofmaterialsandmaterialproportionsfordesignpurposesandresearchanddevelopment.Sampleagehassignificanteffectsonthetestresults,dependingonthetypeofconcreteandthecuringprocedure.Mostconcretes,ifproperlycured,becomeprogressivelyandsignificantlylesspermeablewithtime.Thistestmethodwasdevelopedoriginallyforevaluationsofalternativematerials,butinpracticeitsusehasevolvedtoapplicationssuchasqualitycontrolandacceptancetesting.Insuchcasesitisimperativethatthecuringproceduresandtheageattimeoftestingbeclearlyspecified.Table1providesaqualitativerelationshipbetweentheresultsofthistestandthechlorideionpenetrabilityofconcrete.Numericalresultsofthistest(totalchargepassed,incoulombs)canbeusedasabasisfordeterminingtheacceptabilityofaconcretemixture.Factorssuchastheingredientmaterialsusedandmethodanddurationofcuringoftestspecimensaffectresultsofthistest.(SeeNote1)Note18212;Whenusingthistestfordeterminingacceptabilityofconcretemixtures,statistically-basedcriteriaandtestageforprequalification,orforacceptancebasedonjobsitesamples,shouldbestatedinprojectspecifications.Acceptancecriteriaforthistestshouldconsiderthesourcesofvariabilityaffectingtheresultsandensurebalancedriskbetweensupplierandpurchaser.Theanticipatedexposureconditionsandtimebeforeastructurewillbeputintoserviceshouldbeconsidered.OneapproachtoestablishingcriteriaisdiscussedinRef6.Careshouldbetakenininterpretingresultsofthistestwhenitisusedonsurface-treatedconcretes,forexample,concretestreatedwithpenetratingsealers.Theresultsfromthistestonsomesuchconcretesindicatelowresistancetochlorideionpenetration,while90-daychloridepondingtestsoncompanionslabsshowahigherresistance.Thedetailsofthetestmethodapplyto4-in.(102-mm)nominaldiameterspecimens.Thisincludesspecimenswithactualdiametersrangingfrom3.75in.(95mm)to4.0in.(102mm).Otherspecimendiametersmaybetestedwithappropriatechangesintheappliedvoltagecelldesign(see7.5andFig.1).Forspecimendiametersotherthan3.75in.(95mm),thetestresultvaluefortotalchargepassedmustbeadjustedfollowingtheprocedurein11.2.Forspecimenswithdiameterslessthan3.75in.(95mm),particularcaremustbetakenincoatingandmountingthespecimenstoensurethattheconductivesolutionsareabletocontacttheentireendareasduringthetest.1.1Thistestmethodcoversthedeterminationoftheelectricalconductanceofconcretetoprovidearapidindicationofitsresistancetothepenetrationofchlorideions.Thistestmethodisapplicabletotypesofconcretewherecorrelationshavebeenestablishedbetweenthistestprocedureandlong-termchloridepondingproceduressuchasthosedescribedinAASHTOT259.ExamplesofsuchcorrelationsarediscussedinRefs1-5.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard,exceptwhereSIunitsaregivenfirstfollowedbyinch-poundunitsinparentheses.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressall......
【中国标准分类号】:
【国际标准分类号】:91_100_30
【页数】:7P.;A4
【正文语种】:
【英文标准名称】:Screenluminanceforfilmprojection;generalrequirementstotheluminance,mainvalues
【原文标准名称】:电影放映的银幕照明.一般亮度要求与主要参数值
【标准号】:DIN15571-1-1981
【标准状态】:现行
【国别】:德国
【发布日期】:1981-10
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:公差;亮度;规范(审批);荧光屏;投影法(制图);突块
【英文主题词】:
【摘要】:Screenluminanceforfilmprojection;generalrequirementstotheluminance,mainvaluesLuminanced'écranpourlaprojectioncinématographique;spécificationsgénéralespourlaluminance,valeursfondamentalesZusammenhangmitdervonderInternationalO
【中国标准分类号】:N40
【国际标准分类号】:37_060_10
【页数】:4P;A4
【正文语种】:德语