EN 302550-1-2-.1.1 卫星地面接收站及系统(SES).卫星数字音频(SDR)系统.第1部分:无线电接口的物理层.第2子部分:内物理层单载波调制(英文版本EN302550-1-2V1.1.1(2010-02)的核准本作为德国标准)
时间:2024-05-12 04:35:38 来源: 标准资料网 作者：标准资料网 阅读：8814
【英文标准名称】:SatelliteEarthStationsandSystems(SES)-SatelliteDigitalRadio(SDR)Systems-Part1:PhysicalLayerofRadioInterface-Sub-part2:InnerPhysicalLayerSingleCarrierModulation(EndorsementoftheEnglishversionEN302550-1-2V1.1.1(2010-02)a
【原文标准名称】:卫星地面接收站及系统(SES).卫星数字音频(SDR)系统.第1部分:无线电接口的物理层.第2子部分:内物理层单载波调制(英文版本EN302550-1-2V1.1.1(2010-02)的核准本作为德国标准)
【标准号】:EN302550-1-2-.1.1
【标准状态】:现行
【国别】:
【发布日期】:2010-08
【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】:计算机软件;协作;数据通信;数据传送;地面站;电气工程;欧洲的;接口(数据处理);地面流动服务设施;移动无线电通信系统;外层空间;无线电工程;无线电设备;无线电通信;卫星通信;空间无线电通信;通信;电信;终端装置
【英文主题词】:Computersoftware;Cooperation;Datacommunication;Datatransfer;Earthstations;Electricalengineering;European;Interfaces(dataprocessing);Land-mobileservices;Mobileradiosystems;Outerspace;Radioengineering;Radioplants;Radiocommunication;Satellitecommunications;Spaceradiocommunications;Telecommunication;Telecommunications;Terminaldevices
【摘要】:
【中国标准分类号】:M35
【国际标准分类号】:33_060_30
【页数】:2P;A4
【正文语种】:英语
【英文标准名称】:Resilient,textileandlaminatefloorcoverings-Castorchairtest
【原文标准名称】:弹性铺地物,纺织铺地物和层压板铺地物.脚轮椅试验
【标准号】:ISO4918-2009
【标准状态】:现行
【国别】:国际
【发布日期】:2009-09
【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/TC219
【标准类型】:()
【标准水平】:()
【中文主题词】:评定;颜色变化;弹性的;评估;地板覆盖物;叠层板材;抽样方法;灵敏性;测试;铺地织物;纺织材料;磨损试验
【英文主题词】:Assessment;Colourchanges;Elastic;Evaluations;Floorcoverings;Laminates;Samplingmethods;Susceptibility;Testing;Textilefloorcoverings;Textiles;Weartests
【摘要】:
【中国标准分类号】:W56
【国际标准分类号】:59_080_60;97_150
【页数】:13P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforPlastics:DynamicMechanicalProperties:MeltRheology
【原文标准名称】:塑料的标准试验方法:动力机械性能:熔体流变学
【标准号】:ASTMD4440-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D20.10
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:测量;熔化;塑料;高聚物;工艺;流变性能
【英文主题词】:
【摘要】:Thistestmethodprovidesasimplemeansofcharacterizingtheimportantrheologicalpropertiesandviscosityofthermoplasticpolymersusingverysmallamountsofmaterial(approximately25to50mmindiameterby1to3mminthickness...approximately3to5g).Datamaybeusedforqualitycontrol,researchanddevelopment,andestablishmentofoptimumprocessingconditions.Dynamicmechanicaltestingprovidesasensitivemethodfordeterminingmoltenpolymerpropertiesbymeasuringtheelasticandlossmoduliasafunctionoffrequency,strain,temperature,ortime.Plotsofviscosity,storage,andlossmoduli,andtandeltaasafunctionoftheaforementionedprocessparametersprovidegraphicalrepresentationindicativeofmolecularweight,molecularweightdistribution,effectsofchainbranching,andmelt-processabilityforspecifiedconditions.Valuesobtainedinthistestmethodcanbeusedtoassessthefollowing:5.3.1Complexviscosityofthepolymermeltasafunctionofdynamicoscillation,5.3.2Processingviscosity,minimumaswellaschangesinviscosityasafunctionofexperimentalparameters,5.3.3Effectsofprocessingtreatment,5.3.4Relativepolymerbehavioralproperties,includingviscosityanddamping,and5.3.5Effectsofformulationadditivesthatmightaffectprocessabilityorperformance.Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialsspecificationshalltakeprecedenceoverthosementionedinthetestmethod.IftherearenorelevantASTMmaterialspecifications,thenthedefaultconditionsapply.1.1Thistestmethodoutlinestheuseofdynamicmechanicalinstrumentationindeterminingandreportingtherheologicalpropertiesofthermoplasticresinsandothertypesofmoltenpolymers.Itmaybeusedasamethodfordeterminingthecomplexviscosityandothersignificantviscoelasticcharacteristicsofsuchmaterialsasafunctionoffrequency,strainamplitude,temperature,andtime.Suchpropertiesmaybeinfluencedbyfillersandotheradditives.1.2Itincorporatesalaboratorytestmethodfordeterminingtherelevantrheologicalpropertiesofapolymermeltsubjectedtovariousoscillatorydeformationsonaninstrumentofthetypecommonlyreferredtoasamechanicalordynamicspectrometer.1.3Thistestmethodisintendedtoprovideameansofdeterminingtherheologicalpropertiesofmoltenpolymers,suchasthermoplasticsandthermoplasticelastomersoverarangeoftemperaturesbynonresonant,forced-vibrationtechniques.Plotsofmodulus,viscosity,andtandeltaasafunctionofdynamicoscillation(frequency),strainamplitude,temperature,andtimeareindicativeoftheviscoelasticpropertiesofamoltenpolymer.1.4Thistestmethodisvalidforawiderangeoffrequencies,typicallyfrom0.01to100Hz.1.5Thistestmethodisintendedforhomogenousandheterogeneousmoltenpolymericsystemsandcompositeformulationscontainingchemicaladditives,includingfillers,reinforcements,stabilizers,plasticizers,flameretardants,impactmodifiers,processingaids,andotherimportantchemicaladditivesoftenincorporatedintoapolymericsystemforspecificfunctionalproperties,andwhichcouldaffecttheprocessabilityandfunctionalperformance.Thesepolymericmaterialsystemshavemoltenviscositiestypicallylessthan106Pas(107poise).1.6Apparentdiscrepanciesmayariseinresultsobtainedunderdifferingexperimentalconditions.Withoutchangingtheobserveddata,reportinginfull(asdescribedinthistestmethod)thecond......
【中国标准分类号】:G31
【国际标准分类号】:
【页数】:4P.;A4
【正文语种】: