BS 5857-1.2-1980 密封管道中流体流量的示踪剂测量法.第1部分:水流量测量.第2节:非放射性示踪剂恒速喷射法
时间:2024-05-16 11:28:46 来源: 标准资料网 作者：标准资料网 阅读：9016
【英文标准名称】:Methodsformeasurementoffluidflowinclosedconduits,usingtracers-Measurementofwaterflow-Constantrateinjectionmethodusingnon-radioactivetracers
【原文标准名称】:密封管道中流体流量的示踪剂测量法.第1部分:水流量测量.第2节:非放射性示踪剂恒速喷射法
【标准号】:BS5857-1.2-1980
【标准状态】:现行
【国别】:英国
【发布日期】:1980-03-31
【实施或试行日期】:1980-03-31
【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】:水;比色法;稀释;恒定流速;试验条件;水道;封闭的;流动;流量测量;流量率;示踪法;误差;明渠流动;测量特征;荧光测定法;液体流动;电阻测量;浓度(化学);校正
【英文主题词】:Colorimetry;Conductimetricmethods;Erroranalysis;Flow;Flowmeasurement;Flowmeasurements;Fluorimetry;Pipelines;Testingconditions;Tracermethods;Water
【摘要】:Givestheprincipleofthemeasurementmethod,requiredtracerconditions,choiceofmeasuringlengthofconduit,measurementprocedure,errorsinflowratemeasurementandanalysismethodscurrentlyusedforwaterflowratemeasurement.
【中国标准分类号】:A42
【国际标准分类号】:17_120_10
【页数】:12P.;A4
【正文语种】:英语
【英文标准名称】:Conductivechargingforelectricvehicles-Part2-1:Connectionofanelectricvehicletoana.c./d.c.supply;GermanversionENV50275-2-1:1998
【原文标准名称】:电力车辆的传导充电.第2-1部分:交流/直流供电的电力车辆的连接
【标准号】:DINVENV50275-2-1-2000
【标准状态】:作废
【国别】:德国
【发布日期】:2000-02
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:插头;电能;绝缘电阻;三相电流;电动汽车;规范(验收);保护措施;总论;额定值;电力系统;寿命;介电强度;直流电流;充电站;试验;交流电流;插头和插座连接;试验电压;合格试验;电力道路车辆;(电网)电源;漏电;插座;IP外壳;电气
【英文主题词】:
【摘要】:
【中国标准分类号】:T47
【国际标准分类号】:43_120
【页数】:11P;A4
【正文语种】:德语
【英文标准名称】:StandardTestMethodforTwistinSingleSpunYarnsbytheUntwist-RetwistMethod
【原文标准名称】:退捻加捻法测定单细纱捻数的标准试验方法
【标准号】:ASTMD1422-1999(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【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】:D13.58
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:spunyarn;twist;Twist--textiles
【摘要】:Thistestmethodisusedforacceptancetestinginthetradeforeconomicreasonseventhoughitislessaccuratethanthedirectmethod,TestMethodD1423.Iftherearedifferencesorpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineiftheirisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,thetestsamplesshouldbeusedthatareashomogeneousaspossible,thataredrawnfromthematerialfromwhichthedisparatetestresultsareobtained,andthatareassignedrandomlyinequalnumberstoeachlaboratoryfortesting.Othermaterialswithestablishedtestvaluesmaybeusedforthispurpose.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsmustbeadjustedinconsiderationoftheknownbias.Thex201C;settingx201D;oftwistinsomefiberscausesexcessivecontractionwhentheyarnisretwistedinthereversedirection.Therefore,thenumberofturnsrequiredtobringthespecimenbacktoitsoriginallengthmaybelessthanthenumberofturnsremovedinuntwisting.Thiseffectmaybepartiallyoffsetbytheuseofhigherpretensioningloads;butthisincreasesthedangerofstretchingtheyarn.Littleinformationisavailableonthecorrecttensionstouseforyarnsmadefromdifferentfibersorwithdifferentamountsoftwist.Inadditiontobeinglesstedious,thistestmethodrequiresfewerspecimensthanthedirect-countingmethodandtheresultsmaybesufficientlyaccurateforcertainpurposes.Thistestmethodcanbeusefulinthosecaseswherethemainobjectiveistomeasurevariationsfromanaveragevalue.Anotherpossibleapplicationiswherealargeamountoftwisttestingisrequiredonyarnsofsimilartypeandtwist.Inthiscasepreliminarytestscomparingthismethodandthedirectmethodcouldbeusedtodeterminethecorrectpretension.Twisthasimportanteffectsonthephysicalpropertiesofyarn.Low-twistyarnisloftyandisusuallypreferredforknittingbecauseofitssoftness,coveringpower,andwarmth.Increasingtheamountoftwistcausesanincreaseinyarnstrengthbyincreasingfibercohesion,butasthetwistangleincreasesbeyondanoptimumpoint,strengthdecreasesduetoalossineffectivefibercontribution.Maximumyarnstrengthisobtainedbyinsertingamediumamountoftwisttoobtainanoptimumbalancebetweenthesetwoopposingforces.Hightwistproducesyarnsofhighdensity(x201C;hardx201D;orx201C;wiryx201D;)andhighelongationandmayimprovetheabrasionandimpactresistanceoffabrics.Theoptimumtwistforeithermanufacturingefficiencyorphysicalpropertiesusuallyincreasesasstaplelengthdecreases.Thetwistinayarnbeforeitispackagedmaybedifferentfromthatoftheyarnafterithasbeenwithdrawnfromthepackagebecauseofchangesintensionandtheeffectofthemethodofwithdrawal.Iftheyarniswithdrawnover-end,aslightincreaseordecreaseintwistwilltakeplace,dependinguponthedirectionofthetwistintheyarn,thedirectionofwindingonthepackage,andthelengthoftheturn(orwrap)onthepackage.Note28212;Thedifferenceintwistbetweenunwindingfromthesideandover-endis1/x03C0;d,wheredisthediameterofthepackage.Thus,fora25-mm(1-in.)diameterpacka......