IEEE 140-1990 将射频供暖设备干扰降至最小值的推荐规程

上一篇: DD 194-1990 计算机综合生产(CIM):模型用计算机综合生产体系结构
下一篇: NF X06-070-1990 统计学应用.二个比例的比对

【英文标准名称】:StandardTestMethodforDeterminingTemperaturesandHeatsofTransitionsofFluoropolymersbyDifferentialScanningCalorimetry
【原文标准名称】:用差式扫描量热法测定含氟聚合物温度和转化热的标准试验方法
【标准号】:ASTMD4591-2007
【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(US-ASTM)
【起草单位】:D20.15
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:转化;测定;氟;塑料;聚合物;温度;测试
【英文主题词】:differentialscanningcalorimetry;DSC;fluoropolymer(s);heatsoffusion;meltingpoint;thermalanalysis
【摘要】:DSCanalysismaybeusedwithfluoropolymerstoachieveatleastfourdifferentobjectivesasfollows:4.1.1Tomeasuretransitiontemperaturestoaidintheidentificationofthevariousfluoropolymers,individuallyorinmixtures;4.1.2Tocomparetherelativelevelsofcrystallinecontentoftwoormorespecimensofasampleofafluoropolymerrelativetoanothersamplebymeasuringtheheatoffusion;Note28212;Absolutevaluesofcrystallinecontentcannotbedetermineduntilvaluesforheatsoffusionofthecompletelycrystallinepolymersareavailable.4.1.3TocharacterizePTFE(DSCthermalcurvesdeterminedonpowdersorproductsofPTFEthathaveneverbeenmeltedconveyappreciableinformationaboutdetailsofmorphologyandmolecularstructure);44.1.4Tosupplementthetestforstandardspecificgravity(SSG)describedinSpecificationsD4894andD4895byusingtheheatofcrystallizationofpurePTFEhomopolymer,dependingontherelativemolecularweightofthespecimen.Thescopesofthesespecifications,however,includePTFEresinsmodifiedwithsmallamountsofcomonomers,andmanycommercialPTFEresinsaremodifiedinthismanner.Thesemodificationscanhaveprofoundeffectsoncrystallizationbehavior.Publishedrelationships4betweenheatofcrystallizationandmolecularweightrefertopurePTFEhomopolymersand,therefore,cannotbeappliedtothemodifiedresins.1.1Thistestmethoddefinesconditionsfortheuseofdifferentialscanningcalorimetry(DSC)withfluoropolymers.ItcoverstheuseofDSCanalyseswiththefluoropolymers,PTFE,PVDF,PCTFE,andPVFandtheircopolymersPFA,MFA,FEP,ECTFE,EFEP,VDF/HFP,VDF/TFE/HFP,VDF/CTFE.Thetestmethodisapplicabletotheanalysisofpowdersaswellassamplestakenfromsemi-finishedorfinishedproducts.ThenatureoffluoropolymersissuchthatspecialproceduresareneededforrunningDSCanalysisandinterpretingtheresults.1.2ThevaluesstatedinSIunitsasdetailedinIEEE/ASTMSI-10aretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ThereiscurrentlynoISOstandardthatduplicatesthistestmethod.ISO12086-1andISO12086-2coversimilartestingandreferencethistestmethodfortestingconditions.
【中国标准分类号】:G32
【国际标准分类号】:83_080_20
【页数】:4P.;A4
【正文语种】:


【英文标准名称】:Maritimenavigationandradiocommunicationequipmentandsystems-Digitalinterfaces-Part450:Multipletalkersandmultiplelisteners-hernetinterconnection(IEC61162-450:2011);EnglishversionEN61162-450:2011
【原文标准名称】:海上导航和无线电通信设备及系统.数字接口.第450部分:多听话器和多监听器.局域互联网(IEC61162-450-2011).英文版本EN61162-450-2011
【标准号】:DINEN61162-450-2012
【标准状态】:现行
【国别】:德国
【发布日期】:2012-04
【实施或试行日期】:2012-04-01
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Datacommunication;Dataexchange;Dataformats;Datatransfer;Definitions;Digitalsignals;Electricalengineering;Ethernet;Highspeed;Interconnection;Interfaces;Interfaces(dataprocessing);Maintenance;Marinenavigation;Marineradio;Marineradioservice;Navalengineering;Navigationalaids;Position;Properties;Protocols;Radioequipment;Radioreceivers;Radiotransmitters;Radionavigation;Receivers;Ships;Telecommunication;Testing;Transmitters
【摘要】:
【中国标准分类号】:U66
【国际标准分类号】:47_020_70
【页数】:68P;A4
【正文语种】:德语