【英文标准名称】:Dentistry;Alloysfordentalamalgam
【原文标准名称】:牙科学.牙用锡汞合金
【标准号】:ISO1559-1978
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:
【国际标准分类号】:
【页数】:
【正文语种】:


【英文标准名称】:Acoustics-Soundabsorbersforuseinbuildings-Ratingofsoundabsorption
【原文标准名称】:声学.建筑物用吸声装置.吸声定标
【标准号】:BSENISO11654-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-11-15
【实施或试行日期】:1997-11-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:额定值;隔音材料;隔音;形状;声学测量;噪声控制;分类系统;建筑物;声音吸收;数学计算
【英文主题词】:
【摘要】:1ThisInternationalStandardspecifiesamethodbywhichthefrequency-dependentvaluesofthesoundabsorptioncoefficientcanbeconvertedintoasinglenumber.Beforethisisdone,theone-third-octavebandvaluesofthesoundabsorptioncoefficientmeasuredinaccordancewithISO354areconvertedintooctavebands.InannexBaclassificationmethod,basedonthesesinglenumbers,isgivenforinformation.2Thesingle-numberratingspecifiedinthisInternationalStandardcanbeusedtoformulaterequirementsandtodescribeacousticalpropertiesofsound-absorbingproductstobeusedforroutineapplicationsinnormaloffices,corridors,classrooms,hospitals,etc.Theratingisnotappropriatewhentheproductsaretobeusedinqualifiedenvironmentsrequiringcarefulacousticaldesignbyexpertise.Insuchcases,onlycompletesoundabsorptiondataasafunctionoffrequencyaresatisfactory.ThisInternationalStandardisnotapplicableunlesstheapplicationscoverthewholefrequencyrangeofthereferencecurve.Ifonlyapartofthisrangeisofinterest,itmaybemoreappropriatetolookforproductswithagoodsoundabsorptionwithinthisrangeonly.TheshapeindicatorsdescribedinthisInternationalStandardgivesomeguidanceinidentifyingsuchproductswhichmayhavearelativelylowsinglenumberbutamuchhigherpotentialifamorerestrictedfrequencyrangeisconsidered.Suchproductsshouldbejudgedfromthecompletesoundabsorptioncurve.AstheratingcurveinthisInternationalStandardhasasalowerlimitthe250Hzoctaveband,theratingisnotappropriatebelowthisfrequency.Ifsuchlowfrequenciesareofinterest,referencemustbemadetothecompletesoundabsorptioncurve.ThisInternationalStandardis,inprinciple,applicabletoallbuildingproductsforwhichthesoundabsorptioncoefficienthasbeendeterminedinaccordancewithISO354.Itis,however,oftennotsuitableforapplicationtosingleitems,suchaschairs,baffles,etc.,norisitapplicabletoroadbarriersandroadsurfaces.
【中国标准分类号】:P31
【国际标准分类号】:91_120_20
【页数】:18P;A4
【正文语种】:英语