BS EN 60477-1977 实验室直流(d.c.)电阻器
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【英文标准名称】:Laboratoryd.c.resistors
【原文标准名称】:实验室直流(d.c.)电阻器
【标准号】:BSEN60477-1977
【标准状态】:现行
【国别】:英国
【发布日期】:1977-04-29
【实施或试行日期】:1977-04-29
【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】:基准面;直流电阻;缺陷与故障;定义;直流电流;电气工程;电阻;铭刻;使用说明书;实验室;实验室器皿;泄漏电流;极限(数学);作标记;测量仪器;精密度;精密电阻器;性能;额定值;电阻器;防护屏蔽;标志;规范(验收);符号;温度测量
【英文主题词】:Datum;D.C.resistance;Defects;Definition;Definitions;Directcurrent;Electricalengineering;Electricalresistance;Inscription;Instructionsforuse;Laboratories;Laboratoryware;Leakagecurrents;Limits(mathematics);Marking;Measuringinstruments;Precision;Precisionresistors;Properties;Ratings;Resistors;Shields;Signs;Specification(approval);Symbols;Temperaturemeasurement
【摘要】:
【中国标准分类号】:
【国际标准分类号】:17_220_20
【页数】:20P.;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforMeasuringBulkDensityValuesofPowdersandOtherBulkSolidsasFunctionofCompressiveStress
【原文标准名称】:测量粉末和其他散装固体松密度的标准试验方法.压应力的作用
【标准号】:ASTMD6683-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D18.24
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bulkdensity;bulksolids;compressivestress;powder;Bulkdensity;Bulksolids;Compactionpressure;Powders;Silos
【摘要】:Thedatafromthistestcanbeusedtoestimatethebulkdensityofmaterialsinbinsandhoppersandformaterialhandlingapplicationssuchasfeeders.Thetestresultscanbegreatlyaffectedbythesampleselectedfortesting.Formeaningfulresultsitisnecessarytoselectarepresentativesampleoftheparticulatesolidwithrespecttomoisture(water)content,particle-sizedistributionandtemperature.Forthetestsanappropriatesizesampleshouldbeavailable,andfreshmaterialshouldbeusedforeachindividualtestspecimen.Initialbulkdensity,(x03C1;b)initial,mayormaynotbeusedastheminimumbulkdensity.Thiswilldependonthematerialbeingtested.Forexample,thetwoareoftenclosetothesameforcoarse(mostparticleslargerthanabout6mm),free-flowingbulksolids,butnotforfine,aeratablepowders.Bulkdensityvaluesmaybedependentuponthemagnitudeoftheappliedmassincrements.Traditionally,theappliedmassisdoubledforeachincrementresultinginanappliedmassincrementratioof1.Smallerthanstandardincrementratiosmaybedesirableformaterialsthatarehighlysensitivetotheappliedmassincrementratio.Anexampleofthelatterisamaterialwhosebulkdensityincreases10%ormorewitheachincreaseinappliedmass.Bulkdensityvaluesmaybedependentuponthedurationofeachappliedmass.Traditionally,thedurationisthesameforeachincrementandequalto15s.Forsomematerials,therateofcompressionissuchthatcompletecompression(nochangeinvolumewithtimeatagivenappliedcompressivestress)willrequiresignificantlymorethan15s.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofpersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.PracticeD3740wasdevelopedforagenciesengagedinthetestingorinspection(orboth)ofsoilandrock.Assuchitisnottotallyapplicabletoagenciesperformingthisstandard.However,usersofthisstandardshouldrecognizethattheframeworkofPracticeD3740isappropriateforevaluatingthequalityofanagencyperformingthisstandard.Currentlythereisnoknownqualifyingnationalauthoritythatinspectsagenciesthatperformthisstandard.1.1Thistestmethodcoversanapparatusandprocedurefordeterminingarangeofbulkdensitiesofpowdersandotherbulksolidsasafunctionofcompressivestress.1.2Thistestmethodshouldbeperformedinthelaboratoryundercontrolledconditionsoftemperatureandhumidity.1.3AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.3.1Theproceduresusedtospecifyhowdataarecollected/recordedorcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproceduresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsfortheuserx2019;sobjectives,anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththesecon......
【中国标准分类号】:A42
【国际标准分类号】:19_120
【页数】:5P.;A4
【正文语种】:英语
【英文标准名称】:Determinationofporevolumedistributionandspecificsurfaceareaofsolidsbymercuryintrusion
【原文标准名称】:用汞注入法测定固体的比表面积和气孔容积分布
【标准号】:DIN66133-1993
【标准状态】:现行
【国别】:德国
【发布日期】:1993-06
【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】:表面;试验;浮漂;汞注入;里特尔;孔隙容积分布;分析;孔隙;固体
【英文主题词】:surfaces;analysis;pores;testing;solids;drake;mercuryintrusion;porevolumedistribution;ritter
【摘要】:ThedocumentappliestothedeterminationoftheporevolumedistributionandthespecificsurfaceareaofdispersesolidsbymeasuringtheintrusionofmercuryunderpressureaccordingtothemethodofRitterandDrake.
【中国标准分类号】:A42
【国际标准分类号】:0405
【页数】:3P;A4
【正文语种】:德语
