SJ 2524-1984 微波标准信号发生器技术条件
作者:标准资料网 时间:2024-05-13 14:20:14 浏览:9255
来源:标准资料网
基本信息
| 标准名称： | 微波标准信号发生器技术条件 |
| 英文名称： | Specification for microwave reference signal generators |
| 中标分类： |
石油 >>
石油综合 >>
技术管理 |
| 发布部门： | 中华人民共和国电子工业部 |
| 发布日期： | 1984-10-15 |
| 实施日期： | 1985-05-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2010-01-20 |
| 出版日期： | 1985-04-01 |
| 页数： | 21页 |
适用范围
本标准适用于产生正弦波，频率有效范围部分或全部复盖1GHz到100GHz，并具有正弦调频，正弦调幅，或通/断脉冲调幅的一种或一种以上调制的微波信号发生器（以下简称信号发生器）
前言
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目录
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引用标准
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所属分类： 石油 石油综合 技术管理
【英文标准名称】:Ambientair-Determinationofasbestosfibres-Indirect-transfertransmissionelectronmicroscopymethod
【原文标准名称】:环境空气石棉纤维的测定间接传递电子显微镜法
【标准号】:ISO13794-1999
【标准状态】:现行
【国别】:国际
【发布日期】:1999-07
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC146
【标准类型】:()
【标准水平】:()
【中文主题词】:石棉粉;定义;定义;含量测定;石棉;环境空气;显微分析;空气污染;空气质量
【英文主题词】:Airpollution;Airquality;Ambientair;Asbestos;Asbestosdust;Definition;Definitions;Determinationofcontent;Microscopicanalysis
【摘要】:1SubstancedeterminedThisInternationalStandardspecifiesareferencemethodusingtransmissionelectronmicroscopy(TEM)fordeterminationoftheconcentrationofasbestosstructuresinambientatmospheres.Thespecimenpreparationprocedureincorporatesashinganddispersionofthecollectedpaniculate,sothatallasbestosismeasured,includingtheasbestosoriginallyincorporatedinparticleaggregatesorparticlesofcompositematerials.Thelengths,widthsandaspectratiosoftheasbestosfibresandbundlesaremeasured,andthese,togetherwiththedensityofthetypeofasbestos,alsoallowthetotalmassconcentrationofairborneasbestostobecalculated.Themethodallowsdeterminationofthetype(s)ofasbestosfibrepresent.Themethodcannotdiscriminatebetweenindividualfibresoftheasbestosandnon-asbestosanaloguesofthesameamphibolemineral.2TypeofsampleThemethodisdefinedforpolycarbonatecapillary-porefiltersorcelluloseester(eithermixedestersofcelluloseorcellulosenitrate)filtersthroughwhichaknownvolumeofairhasbeendrawn.Themethodissuitablefordeterminationofasbestosinbothexteriorandbuildingatmospheres.3RangeTheupperlimitfortherangeofconcentrationthatcanbemeasuredontheanalyticalfilteris7000structures/mm.Thelowerlimitoftherangethatcanbemeasuredontheanalyticalfiltercorrespondstodetectionof2,99structuresintheareaofspecimenexamined.Theairconcentrationsrepresentedbythesevaluesareafunctionofthevolumeofairsampledandthedegreeofdilutionorconcentrationselectedduringthespecimenpreparationprocedures.Themethodisparticularlyapplicableformeasurementsinareaswithhighsuspended-particulateconcentrations(exceeding10μg/m),orwheredetectionandidentificationofasbestosfibresarelikelytobepreventedorhinderedbyothertypesofparticulateindirect-transferTEMpreparations.Intheory,thereisnolowerlimittothedimensionsofasbestosfibreswhichcanbedetected.Inpractice,microscopistsvaryintheirabilitytodetectverysmallasbestosfibres.Therefore,aminimumlengthof0,5μmhasbeendefinedastheshortestfibretobeincorporatedinthereportedresults.4LimitofdetectionThelimitofdetectiontheoreticallycanbeloweredindefinitelybyfiltrationofprogressivelylargervolumesofair,concentratingthesampleduringspecimenpreparation,andbyextendingtheexaminationofthespecimensintheelectronmicroscope.Inpractice,thelowestachievablelimitofdetectionforaparticularareaofTEMspecimenexaminediscontrolledbythetotalsuspendedparticulateconcentrationremainingaftertheashingandaqueousdispersalsteps,andthisdependsonthechemicalnatureofthesuspendedparticulate.Fortotalsuspendedparticulateconcentrationsofapproximately10μg/m,correspondingtoclean,ruralatmospheres,andassumingfiltrationof4000litresofair,ananalyticalsensitivityof0,5structure/litrecanbeobtained,equivalenttoalimitofdetectionof1,8structures/litre,ifanareaof0,195mmoftheTEMspecimensisexamined.LowerlimitsofdetectioncanbeachievedbyincreasingtheareaoftheTEMspecimenthatisexamined,orbyconcentrationofthesampleduringspecimenpreparation.Inordertoachievelowerlimitsofdetectionforfibresandbundleslongerthan5μm,andforPCM-equivalentfibres,lowermagnificationsarespecifiedwhichpermitmorerapidexaminationoflargerareasoftheTEMspecimenswhentheexaminationislimitedtothesedimensionsoffibre.
【中国标准分类号】:Z15
【国际标准分类号】:13_040_20
【页数】:64P;A4
【正文语种】:英语
Product Code:SAE ARP5021
Title:Oxygen Cylinder Installation Guide
Issuing Committee:A-10 Aircraft Oxygen Equipment Committee
Scope:This document provides guidance for oxygen cylinder installation on commercial aircraft based on rules and methods practiced in aerospace industry and as far as applicable in other associations.It covers considerations to be taken for oxygen systems from beginning of project phase up to production, maintenance, and servicing.The document is focused on requirements regarding DOT approved oxygen cylinders. However, its basic rules may also be applicable to new development pertaining to use of such equipment in an oxygen environment.For information regarding oxygen cylinders itself, reference should be made to AIR825/12 also.
