【英文标准名称】:Informationtechnology-Securitytechniques-Digitalsignatureswithappendix-Part1:General
【原文标准名称】:信息技术.安全技术.带附录的数字签名.第1部分:总则
【标准号】:ISO/IEC14888-1-2008
【标准状态】:现行
【国别】:国际
【发布日期】:2008-04
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:数据处理;数据保护;数据安全;数据传输;定义;数字的;数字签名;识别;信息交流;信息交换;信息技术;IT安全;安全;签名
【英文主题词】:Dataprocessing;Dataprotection;Datasecurity;Datatransmission;Definitions;Digital;Digitalsignatures;Identification;Informationexchange;Informationinterchange;Informationtechnology;ITsecurity;Safety;Signatures
【摘要】:ISO/IEC14888specifiesseveraldigitalsignaturemechanismswithappendixformessagesofarbitrarylength.ThispartofISO/IEC14888containsgeneralprinciplesandrequirementsfordigitalsignatureswithappendix.ItalsocontainsdefinitionsandsymbolswhichareusedinallpartsofISO/IEC14888.Variousmeansareavailabletoobtainareliablecopyofthepublicverificationkey,e.g.,apublickeycertificate.TechniquesformanagingkeysandcertificatesareoutsidethescopeofISO/IEC14888.Forfurtherinformation,seeISO/IEC9594-8[4],ISO/IEC11770-3[3]andISO/IEC15945[5].
【中国标准分类号】:L80
【国际标准分类号】:35_040
【页数】:17P.;A4
【正文语种】:英语


【英文标准名称】:StandardSpecificationforCompositeCorrugatedSteelPipeforSewersandDrains
【原文标准名称】:排污和排水用复合波纹状钢管的标准规范
【标准号】:ASTMA1042/A1042M-2004(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:A05.17
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:
【英文主题词】:compositecorrugatedsteelpipe;corrugatedsteelpipe;drainagepipe;sewerpipe;Corrugatedsteelsewer/drainpipe;Drains;Sewers
【摘要】:1.1Thisspecificationcoverscompositecorrugatedsteelpipe,intendedforusessuchasstormwaterdrainage,sanitarysewers,underdrains,constructionofculverts,andsimilaruses.Thecompositematerialusedinfabricationofthepipeconsistsofathree-layerpolymerprotectivecoatingonbothsidesofasteelsheetcore.Thethreelayersconsistofaninnerlayeroffusion-bondedepoxyonthesteelsurface,anintermediatelayerofpolyethyleneadhesive,andanouterlayerofhigh-densitypolyethylene.1.2Thethree-layerpolymercoatingprotectsthebasemetalagainstcorrosionorabrasion,orboth.Severeenvironmentsarelikelytocausecorrosionproblemstoaccessoryitemssuchascouplingbandhardwareunlesssupplementalprotectionisprovided.AdditionalprotectionforcompositesteelpipeisavailablebyuseofcoatingsappliedafterfabricationofthepipeasdescribedinSpecificationA849.1.3Thisspecificationdoesnotincluderequirementsforbedding,backfill,ortherelationshipbetweenearthcoverloadandsheetthicknessofthepipe.Experiencewithdrainageproductshasshownthatsuccessfulperformancedependsupontheproperselectionofcorrugationprofile,sheetthickness,typeofbeddingandbackfill,controlledmanufactureintheplant,andcareininstallation.TheinstallationprocedureisdescribedinPracticeA798/A798M.1.4Thisspecificationisapplicabletoordersineitherinch-poundunitsasA1042,orinSIunitsasA1042M.Inch-poundunitsandSIunitsarenotnecessarilyequivalent.SIunitsareshowninbracketsinthetextforclarity,buttheyaretheapplicablevalueswhenthematerialisorderedtoA1042M.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatoryrequirementspriortouse.
【中国标准分类号】:Q81
【国际标准分类号】:93_030
【页数】:8P.;A4
【正文语种】:英语