IEC 60118-4-1981 助听器第4部分:助听器的声频感应线圈中的磁场强度
作者:标准资料网 时间:2024-05-26 13:24:04 浏览:8097
来源:标准资料网
【英文标准名称】:Hearingaids.Part4:Magneticfieldstrengthinaudio-frequencyinductionloopsforhearingaidpurposes
【原文标准名称】:助听器第4部分:助听器的声频感应线圈中的磁场强度
【标准号】:IEC60118-4-1981
【标准状态】:作废
【国别】:国际
【发布日期】:1981
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC29
【标准类型】:()
【标准水平】:()
【中文主题词】:声学;测量技术;磁场;电气工程;场强(电);磁场测量;频率;无线电话;测量;助听器;听力测定;电声学;音频;电磁感应
【英文主题词】:
【摘要】:Appliestosystemsintendedtoprovideaninputsignalforthesedevices.Specifiesastandardvalueofmagneticfieldstrengthandwillgiveanadequatesignal-to-noiseratiowithoutoverloadingthedevice.Therecommendedvaluemayalsobeapplicablet
【中国标准分类号】:L31
【国际标准分类号】:11_180_15
【页数】:9P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforAirContentofFreshlyMixedConcretebythePressureMethod
【原文标准名称】:压力法测定新拌混凝土中空气含量的标准试验方法
【标准号】:ASTMC231/C231M-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【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】:C09.60
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:空气含量;校正;混凝土;校正因子;测量碗;仪表;压力;泵;单位重量;总校正因子
【英文主题词】:aircontent;calibration;concrete;correctionfactor;measuringbowl;meter;pressure;pump;unitweight;Aggregatecorrectionfactor
【摘要】:Thistestmethodcoversthedeterminationoftheaircontentoffreshlymixedconcrete.Thetestdeterminestheaircontentoffreshlymixedconcreteexclusiveofanyairthatmayexistinsidevoidswithinaggregateparticles.Forthisreason,itisapplicabletoconcretemadewithrelativelydenseaggregateparticlesandrequiresdeterminationoftheaggregatecorrectionfactor(see6.1and10.1).ThistestmethodandTestMethodC138/C138MandC173/C173Mprovidepressure,gravimetric,andvolumetricprocedures,respectively,fordeterminingtheaircontentoffreshlymixedconcrete.Thepressureprocedureofthistestmethodgivessubstantiallythesameaircontentsastheothertwotestmethodsforconcretesmadewithdenseaggregates.Theaircontentofhardenedconcretemaybeeitherhigherorlowerthanthatdeterminedbythistestmethod.Thisdependsuponthemethodsandamountofconsolidationeffortappliedtotheconcretefromwhichthehardenedconcretespecimenistaken;uniformityandstabilityoftheairbubblesinthefreshandhardenedconcrete;accuracyofthemicroscopicexamination,ifused;timeofcomparison;environmentalexposure;stageinthedelivery,placementandconsolidationprocessesatwhichtheaircontentoftheunhardenedconcreteisdetermined,thatis,beforeoraftertheconcretegoesthroughapump;andotherfactors.1.1Thistestmethodcoversdeterminationoftheaircontentoffreshlymixedconcretefromobservationofthechangeinvolumeofconcretewithachangeinpressure.1.2ThistestmethodisintendedforusewithconcretesandmortarsmadewithrelativelydenseaggregatesforwhichtheaggregatecorrectionfactorcanbesatisfactorilydeterminedbythetechniquedescribedinSection6.Itisnotapplicabletoconcretesmadewithlightweightaggregates,air-cooledblast-furnaceslag,oraggregatesofhighporosity.Inthesecases,TestMethodC173/C173Mshouldbeused.Thistestmethodisalsonotapplicabletononplasticconcretesuchasiscommonlyusedinthemanufactureofpipeandconcretemasonryunits.1.3Thetextofthistestmethodreferencesnotesandfootnotesthatprovideexplanatoryinformation.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthisstandard.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.(WarningFreshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.)
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:10P.;A4
【正文语种】:
【英文标准名称】:Earth-movingmachinery--Definitionsofdimensionsandsymbols--Part2:Equipmentandattachment
【原文标准名称】:运土机械.尺寸和符号定义.第2部分:设备及附件
【标准号】:JISA8411-2-1998
【标准状态】:作废
【国别】:日本
【发布日期】:1998-04-20
【实施或试行日期】:
【发布单位】:日本工业标准调查会(JISC)
【起草单位】:TechnicalCommitteeonIndustrialMachinery
【标准类型】:()
【标准水平】:()
【中文主题词】:定义;尺寸;土方机械;土地保持工作;标记
【英文主题词】:earth-movingequipment;;dimensions;marks;definitions
【摘要】:
【中国标准分类号】:P97
【国际标准分类号】:53_100
【页数】:14P;A4
【正文语种】:日语
