SAE AS6213 FITTING, ADAPTER, BULKHEAD, FLARED TO HOSE, 37 DEGREE SPHERICAL
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来源:标准资料网
Product Code:SAE AS6213
Title:FITTING, ADAPTER, BULKHEAD, FLARED TO HOSE, 37 DEGREE SPHERICAL
Issuing Committee:G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Scope: To provide the dimensional requirements for the 37掳 spherical flared fitting.
Rationale: To provide the dimensional requirements for the 37掳 spherical flared fitting.
【英文标准名称】:StandardGuideforRapidPrototypingofInformationSystems
【原文标准名称】:信息系统快速原型法的标准指南
【标准号】:ASTME1340-2005(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E31.25
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:design;documentation;evaluation;informationsystem;ProjectManagementPlan;rapidprototyping;requirement;subprojects;systemarchitecture;systemdesign;systemdevelopment;Computerizedsystems;Databasedesign/development/structure;Documen
【摘要】:RapidPrototyping(RP)isaspecificLifeCycleModelusedtodevelopaninformationsystemwhichproducesaworkingmodelofthesystemveryquickly.TheRPprocessshowninFig.1hasmanysimilarities,andsomedifferencesfromtheconventionalsystem(WaterfallLifeCycleModel)developmentprocessshowninFig.2.RPreplacestheRequirementsandDesignprocessesoftheconventionalmethodwithaniterativeprocessofprototyperefinement.Wherethephasesoftheconventionalmethodproduceasetofdocumentsthatdescribethesystem,RPproducesaprototype.Theprototypeistestedandrefinedthroughseveraliterations,withintenseinteractionbetweensystemusersanddevelopers.RPisanexperimentalapproachtosystemdevelopmentwhichprovidesalearningdevice,theprototype,forusersanddevelopers.AprototypecanbeusedasatoolforclarifyingRequirementsfortheoperationalsystem,asameansofevaluatingadesignapproach,orasadevelopingseriesofversionsoftheoperationalsystem.Aprototypeissometimesusedasanexactbehavioralspecificationforanoperationalsystemwhichreplacesit.QualitycharacteristicsareoftensacrificedduringRPforthesakeofrapiddevelopmentandlowcost;robustness,efficiency,generality,portability,andmaintainabilityarecommonlyignoredbutnoneoftheseaspectsneedtobeneglected.However,documentationneededtousethesystemcannotbeignoredbutnoneoftheseaspectsneedtobeneglected.Ax201C;Throwawayx201D;prototypeisusedspecificallytodefineRequirementswhichareusedtoimplementafinalsystem.Anx201C;Evolutionaryx201D;prototypeisaprototypicalsystemusedforongoingrefinementofRequirementswhileoperationalversionsatspecificmilestonesareusedinproductionsettings.RapidinRPmeansthatthetimebetweensuccessiveversionsoftheprototypeisrelativelyshort.Itshouldbeshortenoughthat(1)bothusersanddeveloperscanrememberhoweachversionrelatestothepreviousonewithoutwrittennotes,(2)userrequirementsdonotchangesignificantlywhileaversionisbeingdeveloped,(3)theprototypingteamwillremainintheprojectthroughtheRPphase,and(4)totaltimetodevelopthesystemisacceptable.(Expectedprojectdurationshouldbestatedintheprojectmanagementplanningdocument.SeeSection6andANSI/IEEE1058andANSI/IEEE1074.)Afewdaysbetweenversionsisadequateandafewweeksmaybeacceptable.Ifthetimeneededtoproduceanewversionislonger,thenitmaybenecessarytoproducethatversionusingaconventionalsystemdevelopmentmethodwithfulldocumentationofrequirementsanddesign(seeAppendixX3).RPintegratesanalysis,designandconstruction,anddefinesRequirementsduringtheprocess.Itisespeciallyappropriatefordealingwithproblemswhicharenotwellunderstoodorarerapidlychanging.Theprototypefocusescommunicationbetweenusersanddevelopers.Forlargesystems,aRPapproachcanbeusedatahighleveltoexploretheoverallsystemarchitectureorfeasibility.Itcanalsobeusedtodevelopsubsystemsandcomponentswhoserequirementsarenotfullyunderstood(seeSection11).RPisespeciallywellsuitedfordevelopinguser-systeminterfaces.WhattoPrototype8212;Theill-structuredsystemdevelopmentproblemsthatyieldbesttoRPinclude:Decisionsupportsystemsinareaswherethestateofknowledgechangesrapidly,forexample,researchorclinicalpractice,Systemswhoseusersneedtoaccessand...........
【中国标准分类号】:L77
【国际标准分类号】:35_080
【页数】:12P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 无缝线路铺设及养护维修方法 |
| 英文名称： | Method of laying and maintenance of continuous welded rail track |
| 中标分类： |
铁路 >>
铁路建筑设备 >>
铁路建筑设备综合 |
| ICS分类： |
铁路工程 >>
铁路/架空索道建筑和维护设备
|
| 替代情况： | TB/T 2098-1989 |
| 发布部门： | 中华人民共和国铁道部 |
| 发布日期： | 2007-12-30 |
| 实施日期： | 2008-05-01 |
| 首发日期： | |
| 作废日期： | |
| 提出单位： | 铁道部运输局 |
| 归口单位： | 铁道部计量研究所 |
| 起草单位： | 铁道科学研究院铁道建筑研究所、北京铁路局、沈阳铁路局、郑州铁路局、上海铁路局、济南铁路局、呼和浩特铁路局、铁道部标准计量研究所 |
| 起草人： | 卢耀荣、蒋金洲、田时超、吕关仁、张洪世、龚佩毅、姚冬、张俊东、杨新华、孙法林、马战国 |
| 出版社： | 中国铁道出版社 |
| 出版日期： | 2008-05-01 |
| 页数： | 30页 |
适用范围
本标准规定了既有铁路无缝线路的结构形式、基本要求、允许铺设条件、结构标准、铺设及养护维修作业要求。本标准适用于时速200km及以下的标准轨距铁路。
前言
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目录
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引用标准
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所属分类： 铁路 铁路建筑设备 铁路建筑设备综合 铁路工程 铁路/架空索道建筑和维护设备
