Product Code:SAE AIR1906
Title:Estimation of One-Third Octave Band Lateral Attenuation of Sound From Jet-Propelled Airplanes
Issuing Committee:A-21 Aircraft Noise Measure Noise Aviation Emission Modeling
Scope: Data presented in this AIR are in terms of differences between one-third-octave-band free-field sound pressure levels and are intended for use in estimating far-field aircraft noise. Allowance may be made for the acoustic impedance of the ground surface and sound pressure levels at any height above the ground plane may be estimated. In estimating the long-term time averaged sound level at several locations around an airport served by a mix of airplane types under a variety of atmospheric conditions, airplane operational weights, and flight procedures, it would be more appropriate to use the method of prediction for lateral attenuation given in reference 1.
基本信息
| 标准名称： | 工业水合肼(原ZB/TG 14001-1990) |
| 中标分类： |
化工 >>
无机化工原料 >>
其他无机化工原料 |
| 替代情况： | 原标准号ZB G14001-1990;被HG/T 3259-2004代替 |
| 发布日期： | 1990-03-14 |
| 实施日期： | 1990-12-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2005-06-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 8页 |
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： 化工 无机化工原料 其他无机化工原料
【英文标准名称】:Informationtechnology;datainterchangeon130mm(5,25in)flexiblediskcartridgesusingmodifiedfrequencymodulationrecordingat7958ftprad,1,9tpmm(48tpi),onbothsides;ISOtype202;part1:dimensional,physicalandmagneticcharacteristics
【原文标准名称】:信息技术数据交换用130mm(5.25in)改进调频制记录,密度为7958ftprad、1.9tpmm(48tpi)的双面软盘ISO202型第1部分:尺寸、物理性能和磁盘性能
【标准号】:ISO/IEC7487-1-1993
【标准状态】:现行
【国别】:国际
【发布日期】:1993-12
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:规范(验收);定义;数据处理;磁道格式;磁道间距;磁盘;双频记录方式;导轨;磁记录;物理的;数据介质;软盘;规范;信息处理;数据记录;磁性能;导轨配置;外层;存储;不透明度;信息交流;布置;尺寸;材料;可置换性;信息技术;双向;特性;记录;信息交换;仪器;物理性能
【英文主题词】:Datamedia;Dataprocessing;Datarecording;Definition;Definitions;Dimensions;Doubledirection;Envelopes;Flexibledisks;Informationexchange;Informationinterchange;Informationprocessing;Informationtechnology;Instruments;Layout;Magneticdisks;Magneticproperties;Magneticrecording;Materials;Memory;Opacity;Physical;Physicalproperties;Properties;Recording;Replaceability;Specification(approval);Specifications;Trackformats;Tracklayout;Trackpitch;Tracks;Two-frequencyrecordingmode
【摘要】:Specifiesthedimensional(environmentandtransportation,dimensionofjacket,lineranddisk),physical(inflammability,coefficientoflinearthermalexpansion,coefficientoflinearhygroscopicexpansion,opacity,torque)andmagnetic(trackgeometry,functionaltesting)characteristicsandrequirementsofthecartridgesoastoprovidephysicalinterchangeabilitybetweendataprocessingsystems.
【中国标准分类号】:L64
【国际标准分类号】:35_220_21
【页数】:20P.;A4
【正文语种】:英语