ASTM A 893/A 893M-2003 在微波频率上非金属磁性材料的复数介电常数的标准试验方法

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【英文标准名称】:Industrial-processcontrolvalves.Noiseconsiderations.Controlvalveaerodynamicnoisepredictionmethod
【原文标准名称】:工业过程控制阀.噪声问题.控制阀的气动噪声预测法
【标准号】:BSEN60534-8-3-2011
【标准状态】:现行
【国别】:英国
【发布日期】:2011-06-30
【实施或试行日期】:2011-06-30
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Acousticmeasurement;Aerodynamicflow;Airbornenoise;Controlvalves;Correctingunits;Definitions;Direction-controlvalves;Electricalengineering;Fluidengineering;Laboratorytesting;Laboratorytests;Liquidflow;Mathematicalcalculations;Measurement;Measurementofairbornenoise;Measuringtechniques;Methodsofcalculation;Noise;Noiseemissions;Noisemeasurements;Pipelines;Processcontrol;Processmeasuringandcontroltechnology;Soundpressurelevel;Testing;Valves
【摘要】:ThispartofIEC60534establishesatheoreticalmethodtopredicttheexternalsoundpressurelevelgeneratedinacontrolvalveandwithinadjacentpipeexpandersbytheflowofcompressiblefluids.Thismethodconsidersonlysingle-phasedrygasesandvapoursandisbasedontheperfectgaslaws.Thisstandardaddressesonlythenoisegeneratedbyaerodynamicprocessesinvalvesandintheconnectedpiping.Itdoesnotconsideranynoisegeneratedbyreflectionsfromexternalsurfacesorinternallybypipefittings,mechanicalvibrations,unstableflowpatternsandotherunpredictablebehaviour.Itisassumedthatthedownstreampipingisstraightforalengthofatleast2mfromthepointwherethenoisemeasurementismade.Thismethodisvalidonlyforsteelandsteelalloypipes(seeEquations(21)and(23)in5.5).Themethodisapplicabletothefollowingsingle-stagevalves:globe(straightpatternandanglepattern),butterfly,rotaryplug(eccentric,spherical),ball,andvalveswithcagetrims.SpecificallyexcludedarethefullboreballvalveswheretheproductFpCexceeds50%oftheratedflowcoefficient.Forlimitationsonspeciallownoisetrimsnotcoveredbythisstandard,seeClause8.WhentheMachnumberinthevalveoutletexceeds0,3forstandardtrimor0,2forlownoisetrim,theprocedureinClause7isusedTheMachnumberlimitsinthisstandardareasfollows:
【中国标准分类号】:J16
【国际标准分类号】:17_140_20;23_060_40;25_040_40
【页数】:52P.;A4
【正文语种】:英语


【英文标准名称】:Milkandmilkproducts-Sensoryanalysis-Part1:generalguidancefortherecruitement,selection,trainingandmonitoringofassessors.
【原文标准名称】:牛奶和乳制品.感官分析.第1部分:检验员的招聘,选择,培训和检验的一般指南
【标准号】:NFV04-029-1-2009
【标准状态】:现行
【国别】:法国
【发布日期】:2009-07-01
【实施或试行日期】:2009-07-10
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:农产品;乳制品分析;评估;食品检验;食品;食品检测;指导手册;检验师;说明书;研究;牛奶;全体人员;选择;感官分析;感官分析(食品);品尝检验;试验设备;测试;检验人员;培训
【英文主题词】:Agriculturalproducts;Dairyanalysis;Evaluations;Foodinspection;Foodproducts;Foodtesting;Guidebooks;Inspectors;Instructions;Investigations;Milk;Personnel;Selection;Sensoryanalysis;Sensoryanalysis(food);Tastetests;Testequipment;Testing;Testingpersonnel;Training
【摘要】:
【中国标准分类号】:X16
【国际标准分类号】:
【页数】:26P;A4
【正文语种】:其他