【英文标准名称】:Roadtransportandtraffictelematics-Electronicfeecollection-Applicationinterfacedefinitionfordedicatedshort-rangecommunication(ISO14906:2004);EnglishversionENISO14906:2004
【原文标准名称】:道路运输和交通远程信息管理.电子收费.专用短程通信的应用接口定义
【标准号】:ENISO14906-2004
【标准状态】:现行
【国别】:
【发布日期】:2005-11
【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】:远程信息管理;价目单;开放系统互连;应用层;道路运输;TTI;交通和旅游者信息;数据传输;界面;交通业务;定义;数据处理;远程处理;英语;信息交换
【英文主题词】:Applicationlayer;Dataprocessing;Datatransmission;Definition;Definitions;Englishlanguage;Informationinterchange;Interfaces;Messageaccounting;Opensystemsinterconnection;OSI;Roadtransport;Tariffs;Telematics;Teleprocessing;Toll;Traffic;Trafficandtravellerinformations;TTI
【摘要】:
【中国标准分类号】:R85
【国际标准分类号】:35_240_60
【页数】:117P.;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforPrecipitatedSilica-SurfaceAreabyMultipointBETNitrogenAdsorption
【原文标准名称】:用多点布-埃-特氮气吸附法对沉积二氧化硅表面面积的标准测试方法
【标准号】:ASTMD1993-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:D11.20
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:试验;硅酸盐
【英文主题词】:nitrogenadsorptionsurfacearea;precipitatedhydratedsilica;silicas;surfacearea;
【摘要】:Thistestmethodisusedtomeasurethesurfaceareaofprecipitated,hydratedsilicasthatisavailabletothenitrogenmoleculeusingthemultipoint(B.E.T.)method.Solidsadsorbnitrogenand,underspecificconditions,theadsorbedmoleculesapproachamonomolecularlayer.ThequantityinthishypotheticalmonomolecularlayeriscalculatedusingtheBETequation.Combiningthiswiththeareaoccupiedbythenitrogenmoleculeyieldsthetotalsurfaceareaofthesolid.Thistestmethodmeasurestheestimatedquantityofnitrogeninthemonomolecularlayerbyadsorptionatliquidnitrogentemperatureandatseveral(atleastfive)partialpressuresofnitrogen.Beforeasurfaceareadeterminationcanbemadeitisnecessarythatthesilicabestrippedofanymaterialwhichmayalreadybeadsorbedonthesurface.Thestrippingofadsorbedforeignmaterialeliminatestwopotentialerrors.Thefirsterrorisassociatedwiththeweightoftheforeignmaterial.Theseconderrorisassociatedwiththesurfaceareathattheforeignmaterialoccupies.1.1ThistestmethodcoversaprocedurewhichisusedtomeasurethesurfaceareaofprecipitatedhydratedsilicasbytheconventionalBrunauer,Emmett,andTeller(BET)theoryofmultilayergasadsorptionbehaviorusingmultipointdeterminations,similartothatusedforcarbonblackinTestMethodsD4820.Thistestmethodspecifiesthesamplepreparationandtreatment,instrumentcalibrations,requiredaccuracyandprecisionofexperimentaldata,andcalculationsofthesurfacearearesultsfromtheobtaineddata.1.2Thistestmethodisusedtodeterminethenitrogensurfaceareaofprecipitatedsilicaswithspecificsurfaceareasintherangeof1to50hm2/kg(10to500m2/g).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Theminimumsafetyequipmentshouldincludeprotectivegloves,sturdyeyeandfaceprotection,andmeanstodealsafelywithaccidentalmercuryspills.
【中国标准分类号】:G53
【国际标准分类号】:71_060_20
【页数】:3P.;A4
【正文语种】:
基本信息
标准名称: | 三乙膦酸铝原药 |
中标分类: |
化工 >>
化肥、农药 >>
农药 |
替代情况: | 原标准号ZB G25008-89;被HG 3296-2001代替 |
发布日期: | |
实施日期: | 2002-07-01 |
首发日期: | |
作废日期: | 2002-07-01 |
出版日期: | |
页数: | 4页 |
适用范围
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前言
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目录
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引用标准
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所属分类: 化工 化肥 农药 农药