DB41/T 556-2008 白萝卜生产技术规程
时间:2024-05-15 10:41:21 来源: 标准资料网 作者:标准资料网 阅读:9973
基本信息
标准名称: | 白萝卜生产技术规程 |
发布部门: | 河南省质量技术监督局 |
发布日期: | 2008-11-15 |
实施日期: | 2008-12-30 |
首发日期: | |
作废日期: | |
出版社: | 中国标准出版社 |
出版日期: | 2008-12-30 |
适用范围
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前言
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引用标准
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所属分类: 食品 食品加工与制品 肉类加工制品 食品技术 肉 肉制品和其他动物类食品 肉和肉制品
【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