DIN V ENV 41103-4-1992 信息系统互连.通过与局域网络相连接的终端系统中的定向连接OSI转接服务提供定向连接OSI传输服务.第4部分:标记环存取控制子层和物理层的局域子网型要求
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【英文标准名称】:Informationsystemsinterconnection;provisionoftheOSIconnection-modetransportserviceusingtheOSIconnection-modenetworkserviceinanendsystemattachedtoaLAN;part4:localareasubnetwork-typerequirementsforthetokenringmediumaccess
【原文标准名称】:信息系统互连.通过与局域网络相连接的终端系统中的定向连接OSI转接服务提供定向连接OSI传输服务.第4部分:标记环存取控制子层和物理层的局域子网型要求
【标准号】:DINVENV41103-4-1992
【标准状态】:作废
【国别】:德国
【发布日期】:1992-12
【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】:开式系统互连;信息交换;电路网络;传播学;传播技术;局域网;电子数据处理;控制规程;通信系统;物理层;数据处理;信息处理;EDP;数据传送;规范(批准);数据传输;信息交流;开式系统;标记;数据通信;电气工程;计算机网络;局部
【英文主题词】:
【摘要】:
【中国标准分类号】:L79
【国际标准分类号】:35_100_80
【页数】:14P;A4
【正文语种】:德语
【英文标准名称】:Informationtechnology-Programminglanguages-FullBASIC
【原文标准名称】:信息技术.程序设计语言.全BASIC
【标准号】:ANSI/INCITS/ISO/IEC10279-1991
【标准状态】:现行
【国别】:美国
【发布日期】:1991
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:程序设计语言;BASIC语言;程序设计;信息技术;数据处理
【英文主题词】:BASIC;Computerprograms;Dataprocessing;Informationtechnology;Programming;Programminglanguages
【摘要】:ThisInternationalStandardisdesignedtopromotetheinterchangeabilityofBASICprogramsamongavarietyofautomaticdataprocessingsystems.ThisInternationalStandardspecifiesitsownconformancesubsets,whichincludethosespecifiedinANSIX3.113-1987andECMA-116.
【中国标准分类号】:L74
【国际标准分类号】:35_060
【页数】:
【正文语种】:英语
【英文标准名称】:StandardTestMethodforDynamicYoung''sModulus,ShearModulus,andPoisson''sRatiobySonicResonance
【原文标准名称】:利用回声共振测试动态杨氏模量、剪切模数和泊松比的标准试验方法
【标准号】:ASTME1875-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:E28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dynamic;elasticmodulus;elasticproperties;Poisson'sratio;resonance;resonantbeam;shearmodulus;Young'smodulus;DynamicYoung'smodulus;Modulusofelasticity;Poisson'sratio;Shearmodulus;Sonicresonance;Young'smodulus
【摘要】:Thistestmethodhasadvantagesincertainrespectsovertheuseofstaticloadingsystemsformeasuringmoduli.Thistestmethodisnondestructiveinnature.Onlyminutestressesareappliedtothespecimen,thusminimizingthepossibilityoffracture.Theperiodoftimeduringwhichmeasurementstressisappliedandremovedisoftheorderofhundredsofmicroseconds.Withthistestmethoditisfeasibletoperformmeasurementsathightemperatures,wheredelayedelasticandcreepeffectswouldinvalidatemodulusmeasurementscalculatedfromstaticloading.Thistestmethodissuitablefordetectingwhetheramaterialmeetsspecifications,ifcognizanceisgiventooneimportantfactinmaterialsareoftensensitivetothermalhistory.Therefore,thethermalhistoryofatestspecimenmustbeconsideredincomparingexperimentalvaluesofmodulitoreferenceorstandardvalues.Specimendescriptionsshouldincludeanyspecificthermaltreatmentsthatthespecimenshavereceived.1.1Thistestmethodcoversthedeterminationofthedynamicelasticpropertiesofelasticmaterials.Specimensofthesematerialspossessspecificmechanicalresonantfrequenciesthataredeterminedbytheelasticmodulus,mass,andgeometryofthetestspecimen.Therefore,thedynamicelasticpropertiesofamaterialcanbecomputedifthegeometry,mass,andmechanicalresonantfrequenciesofasuitabletestspecimenofthatmaterialcanbemeasured.DynamicYoung''smodulusisdeterminedusingtheresonantfrequencyintheflexuralmodeofvibration.Thedynamicshearmodulus,ormodulusofrigidity,isfoundusingtorsionalresonantvibrations.DynamicYoung''smodulusanddynamicshearmodulusareusedtocomputePoisson''sratio.1.2Thistestmethodisspecificallyappropriateformaterialsthatareelastic,homogeneous,andisotropic(1).Materialsofacompositecharacter(particulate,whisker,orfiberreinforced)maybetestedbythistestmethodwiththeunderstandingthatthecharacter(volumefraction,size,morphology,distribution,orientation,elasticproperties,andinterfacialbonding)ofthereinforcementinthetestspecimenwillhaveadirecteffectontheelasticproperties.Thesereinforcementeffectsmustbeconsideredininterpretingthetestresultsforcomposites.Thistestmethodisnotsatisfactoryforspecimensthathavecracksorvoidsthataremajordiscontinuitiesinthespecimen.Neitheristhetestmethodsatisfactorywhenthesematerialscannotbefabricatedinauniformrectangularorcircularcrosssection.1.3Ahigh-temperaturefurnaceandcryogeniccabinetaredescribedformeasuringthedynamicelasticmoduliasafunctionoftemperaturefromx2013;195to1200x00B0;C.1.4Modificationofthistestmethodforuseinqualitycontrolispossible.Arangeofacceptableresonantfrequenciesisdeterminedforaspecimenwithaparticulargeometryandmass.Anyspecimenwithafrequencyresponsefallingoutsidethisfrequencyrangeisrejected.Theactualmodulusofeachspecimenneednotbedeterminedaslongasthelimitsoftheselectedfrequencyrangeareknowntoincludetheresonantfrequencythatthespecimenmustpossessifitsgeometryandmassarewithinspecifiedtolerances.1.5TherearematerialspecificASTMstandardsthatcoverthedeterminationofresonancefrequenciesandelasticpropertiesofspecificmaterialsbysonicresonanceorbyimpulseexcitationofvibration.TestMethodsC215,C623,C747,C848,C1198,andC1259maydifferfromthistestmethodinseveralareas(forexample;samplesize,d......
【中国标准分类号】:H23
【国际标准分类号】:81_060_20
【页数】:9P.;A4
【正文语种】:英语