YD/T 828.34-1996 数字微波传输系统中所用设备的测量方法 第3部分:卫星通信地球站的测量 第4节:低噪声放大器
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基本信息
标准名称: | 数字微波传输系统中所用设备的测量方法 第3部分:卫星通信地球站的测量 第4节:低噪声放大器 |
中标分类: |
通信、广播 >>
通信设备 >>
卫星通信设备 |
发布部门: | 中华人民共和国邮电部 |
发布日期: | 1996-03-12 |
实施日期: | 1996-03-12 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
提出单位: | 邮电部电信科学研究规划院 |
归口单位: | 邮电部电信科学研究规划院 |
起草单位: | 邮电部第四研究所 |
起草人: | 李指行、邵红威、彭玉琴 |
出版社: | 人民邮电出版社 |
出版日期: | 1996-03-12 |
页数: | 5页 |
书号: | 155066.2-10932 |
适用范围
本标准规定卫星通信地球站中所用的低噪声放大器的测量方法。
前言
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目录
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引用标准
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所属分类: 通信 广播 通信设备 卫星通信设备
【英文标准名称】:Passengerscars;specificationsformechanicaljacks
【原文标准名称】:乘用车机械式千斤顶规范
【标准号】:ISO8720-1991
【标准状态】:现行
【国别】:国际
【发布日期】:1991-07
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC22
【标准类型】:()
【标准水平】:()
【中文主题词】:私人汽车;道路车辆;规范;规范(审批);千斤顶
【英文主题词】:Jacks;Privatecars;Roadvehicles;Specification(approval);Specifications
【摘要】:Specifiesrequirementstoensurethesafetyinuseoforiginalequipmentmechanicaljackssuppliedwithpassengercars(asdefinedinISO3833)inchangingwheelsandputtingonchains.
【中国标准分类号】:J80;T42
【国际标准分类号】:43_180
【页数】:2P;A4
【正文语种】:英语
【英文标准名称】:Informationtechnology-Hypermedia/Time-basedstructuringlanguage(HyTime)
【原文标准名称】:信息技术超媒体/时基结构化语言(HyTime)
【标准号】:ISO/IEC10744-1997
【标准状态】:现行
【国别】:国际
【发布日期】:1997-08
【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】:传播技术;定义;超媒体;超时间;程序设计语言;信息技术
【英文主题词】:Communicationtechnology;Definitions;Hypermedia;HyTime;Informationtechnology;Programminglanguages
【摘要】:1DefinitionofscopeThisInternationalStandarddefinesalanguageandunderlyingmodelfortherepresentationof"hyperdocuments"thatlinkandsynchronizestaticanddynamic(time-based)informationcontainedinmultipleconventionalandmultimediadocumentsandinformationobjects.Thelanguageisknownasthe"Hypermedia/Time-basedStructuringLanguage",or"HyTime".HyTimecanrepresenttimeinboththeabstract,or"musical"sense,andinuser-definedreal-timeunits.Italsoprovidesawayofrelatingthetwosothatelementsoftime-dependentdocumentscanbesynchronized.NOTE7Thisfacilityextendstotherepresentationofmultimediainformationthepower,oncelimitedtoconventionaldocuments,todistinguishintrinsicinformationcontentfromstyleconsiderations.HyTime'stechniquesforrepresentingitstimemodelareequallyapplicabletospatialandotherdomains;allaretreatedassystemsformeasuringalongdifferentaxesofacoordinatespace.Arbitrarycross-referencesandaccesspathsbasedonexternalinteractions("hypermedialinks")arealsosupported.HyTime'stimerepresentationcontainssufficientinformationtoderivethedurationsofbothcontrol("gestural")data(e.g.,controlinformationforaudioorvideohardware)andvisualdata(e.g.,amusicscore,presentationstoryboard,ortelevisionscript).ThemediaformatsanddatanotationsofobjectsinaHyTimehyperdocumentcanincludeformattedandunformatteddocuments,audioandvideosegments,stillimages,andobject-orientedgraphics,amongothers.Userscanspecifythepositionsandsizesofoccurrencesofobjectsinspaceandtime,usingavarietyofmeasurementunitsandgranularities.Temporalrequirementsofapplicationsrangingfromanimationtoprojectmanagementcanbesupportedbychoosingappropriatemeasurementgranules.NOTE8ThisInternationalStandarddoesnotaddresstherepresentationofaudioorvideocontentdata,butsimplydefinesthemeansbywhichthestart-timeanddurationofsuchdatacanbesynchronizedwithotherdigitizedinformation.Nordoesitspecifythelayoutprocessbywhichoccurrencesofunformatteddocumentsandotherinformationobjectscanbemadetofitthepositionsandsizesspecifiedforthem.HyTimeisanenablingstandard,notanencompassingone.Asaresult,theobjectscomprisingaHyTimehyperdocumentarefreetoconformtoanyapplicationarchitectures,ortodocumentarchitecturesimposedbystandards,andtoberepresentedinanynotationpermittedbythosearchitectures.Onlythe"hubdocumenf,whichmaydeterminethehyperdocumentmembership,mustconformtoHyTimeinadditiontoanyotherarchitecturestowhichitmayconform.HyTimeisdesignedforflexibilityandextensibility.Optionalsubsetscanbeimplemented,aloneorinconjunctionwithuser-definedextensions.TheHypermedia/Time-basedStructuringLanguage(HyTime)isanSGMLapplicationconformingtoInternationalStandardISO8879—StandardGeneralizedMarkupLanguage.ThehyperdocumentinterchangeformatrecommendedinthisInternationalStandardisISO9069,theSGMLDocumentInterchangeFormat(SDIF).SDIFisdefinedinAbstractSyntaxNotation1(ISO/IEC8824)andcanbeencodedaccordingtothebasicencodingrulesofISO/IEC8825forinterchangeusingprotocolsconformingtotheOpenSystemsInterconnection(OSI)model.Otherinterchangeformatscanalsobeused.2FieldofapplicationThefieldofapplicationofHyTimeis"integratedopenhypermedia"(IOH),the"bibliographicmodel"ofhyperlinkingwhereinanauthorcan,byasuitablereference,linktoanything,anywhere,atanytime.BecauseofHyTime'smodulardesignandflexibleconformancerules,implementationsneedsupportonlythosefacilitiesthatarewithintheirpresentcapabilities.Userinvestmentinhyperdocumentpreparationisneverthelessencouragedbecauseofthewell-definedupward-compatiblepathtoafullhypermediasolution.H
【中国标准分类号】:L74
【国际标准分类号】:35_060;35_240_99
【页数】:468P.;A4
【正文语种】:英语