SAE AS3435 Spacer, Sleeve - For .190 Inch Bolt, AMS4901 or AMS4921
作者:标准资料网 时间:2024-05-15 06:29:53 浏览:8685
来源:标准资料网
Product Code:SAE AS3435
Title:Spacer, Sleeve - For .190 Inch Bolt, AMS4901 or AMS4921
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available.
【英文标准名称】:Acoustics-Statisticaldistributionofhearingthresholdsasafunctionofage
【原文标准名称】:声学.听阈与年龄的关系的统计分布
【标准号】:BSENISO7029-2000
【标准状态】:现行
【国别】:英国
【发布日期】:2000-08-15
【实施或试行日期】:2000-08-15
【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】:声学;听觉阈;衰老;龄期;声学测量;统计分布;频率;音频;听力测定;中位数;听觉
【英文主题词】:Acoustics;Age;Audibility;Audiometry;Auditorythreshold;Definition;Definitions;Determination;Mathematicalcalculations;People;Statisticaldata;Statisticaldistribution;Statistics
【摘要】:ThisInternationalStandardprovidesdescriptivestatisticsofthehearingthresholdforpopulationsofvariousages.Itspecifiesthefollowing,fortherangeofaudiometricfrequenciesfrom125Hzto8000Hzandforpopulationsofotologicallynormalpersonsofagivenagewithintheagelimitsof18yearsto70yearsinclusive:a)theexpectedmedianvalueofhearingthresholdsgivenrelativetothemedianhearingthresholdattheageof18years;b)theexpectedstatisticaldistributionaboveandbelowthemedianvalue.Thedataareapplicableforestimatingtheamountofhearinglosscausedbyaspecificagentinapopulation.Suchacomparisonisvalidifthepopulationunderstudyconsistsofpersonswhoareotologicallynormalexceptfortheeffectofthespecificagent.NoiseexposureisanexampleofaspecificagentandforthisapplicationselecteddatafromthisInternationalStandardarereferredtoas"DataBaseA"inISO1999.Thedatamayalsobeusedtoassessanindividual'shearinginrelationtothedistributionofhearingthresholdswhichisnormalfortheperson'sagegroup.However,itisnotpossibletodetermineforanindividualpreciselywhichpartofanobservedhearinglossisattributabletoanaccumulationofdetrimentaleffectsonthehearingwhichincreasewithage,andwhichparthasbeencausedbyotherfactorssuchasnoise.Thehearingthresholddeviationasdefinedhereinandthehearingthresholdlevelasdefinedinotherstandards(ISO389-1,ISO8253-1,ISO8253-2,IEC60645-1)expressthehearingthresholdofanindividualoranindividualearrelativeto,respectively,a)themedianhearingthresholdofapopulationof18-year-oldpersons,orb)areferencezerolevelspecifiedinvariouspartsofISO389.Totheextentthatthereferencezerolevelrepresentsthemedianofthe18-year-oldpopulation,thevaluesofthetwotermswillbethesame.
【中国标准分类号】:A42
【国际标准分类号】:17_140_99
【页数】:18P;A4
【正文语种】:英语
基本信息
| 标准名称： | 定焦距电影摄影物镜 |
| 中标分类： |
仪器、仪表 >>
电影、照相、缩微、复印设备 >>
镜头 |
| 替代情况： | 转化为JB/T 9426.1-1999 |
| 发布日期： | |
| 实施日期： | 1989-07-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
适用范围
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前言
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目录
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引用标准
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所属分类： 仪器 仪表 电影 照相 缩微 复印设备 镜头
