BS ISO 125-2011 天然胶乳浓缩液.碱度的测定

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【英文标准名称】:Methodsofmeasurementforequipmentusedindigitalmicrowaveradiotransmissionsystems-Part2-4:Measurementsonterrestrialradio-relaysystems;Transmitter/receiverincludingmodulator/demodulator
【原文标准名称】:数字微波无线电传输系统使用设备的测量方法.第2-4部分:地面无线电中继系统的测量.包括调制器/解调器的发射机/接收机
【标准号】:IEC60835-2-4Edition1.1-1998
【标准状态】:现行
【国别】:国际
【发布日期】:1998-02
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/SC12E
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:ThisSectionofIEC60835-2dealswithmethodsofmeasurementfortransmittersincludingmodulators,andreceiversincludingdemodulators,usedindigitalradio-relaysystems.MeasurementsforadaptiveequalizersaregiveninIEC60835-2-8.Methodsofmeasurementforthea.g.c.characteristic,selectivityandnoisefigureandreceiverlocaloscillatorfrequencyaregenerallyapplicableonlywhenthereceiveri.f.outputisaccessible.Thismaynotbethecaseforreceiversusedinsystemshavingamicrowavedemodulatororalowbitrate,e.g.below2Mbit/s.
【中国标准分类号】:M34
【国际标准分类号】:33_060_30
【页数】:25P;A4
【正文语种】:英语


【英文标准名称】:StandardSpecificationforAerospacePartsMachinedfromPolychlorotrifluoroethylene
【原文标准名称】:机械加工的聚氯三氟乙烯航空航天部件的标准规范
【标准号】:ASTMD7194-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:D20.15.12
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:航天技术;橡胶;航空航天运输;航空工程;经机械加工的;塑料;聚氯三氟乙烯
【英文主题词】:annealing;dimensionalstability;finishedparts;PCTFE;polychlorotrifluoroethylene
【摘要】:1.1Thisspecificationisintendedtobeameansofcallingoutfinishedmachinedpartsreadyforaerospaceuse.Suchpartsmayalsofinduseinselectedcommercialapplicationswherethereareclearbenefitsderivedfromtheuseofpartswithknownorcontrolledcrystallinity,highmolecularweight,goodmolecularweightretention,dimensionalstabilityinthefinishedpart,andtightlycontrolledengineeringtolerances.1.2Thisspecificationestablishesrequirementsforpartsmachinedfromvirgin,unplasticized,100%polychlorotrifluoroethylene(PCTFE)homopolymers.1.3ThisspecificationdoesnotcoverpartsmachinedPCTFEcopolymers,PCTFEfilmortapelessthan0.25-mm[0.010-in.]thick,ormodifiedPCTFE(containingpigmentsorplasticizers).1.4Thisspecificationdoesnotallowpartscontainingrecycledmaterial.1.5Thisspecificationclassifiespartsintothreeclassesbaseduponintendedusesandexposures:oxygen-containingmedia,reactivemedia,andinertgases.1.6ApplicationPCTFEcomponentscoveredbythisspecificationarevirgin,100%PCTFEresin,freeofplasticizersandotheradditives.Thecomponentsarecombustionresistantinoxygen,dimensionallystable,andmeetotherspecificphysicalcharacteristicsappropriatefortheirenduse.Theyareusedinvalves,regulators,andotherdevicesinoxygen,air,helium,nitrogen,hydrogen,ammonia,andotheraerospacemediasystems.Thecomponentstypicallyareusedasvalveseats,o-rings,seals,andgaskets.Theyareremovedandreplacedduringnormalmaintenanceprocedures.Thecomponentsprovidereliablesealingsurfacesresultinginproperclosureofvalvesandrelateddevicesandnoleakagefromthesystemintotheenvironment.Theywillexperiencestaticmechanicalloading,cyclicmechanicalloading,temperaturesrangingfromcryogenicto71176;C[160176;F],andpressuresupto46.2MPa[6700psi].1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinbracketsareforinformationonly.1.8Thefollowingprecautionarycaveatpertainsonlytothetestmethodsportion,Section12ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoequivalentISOstandard.
【中国标准分类号】:V22
【国际标准分类号】:49_025_40;49_140
【页数】:4P.;A4
【正文语种】: