BS 4140-22-1980 氧化铝试验方法.第22部分:锰含量的测定
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【英文标准名称】:Methodsoftestforaluminiumoxide-Determinationofmanganesecontent
【原文标准名称】:氧化铝试验方法.第22部分:锰含量的测定
【标准号】:BS4140-22-1980
【标准状态】:现行
【国别】:英国
【发布日期】:1980-04-30
【实施或试行日期】:1980-04-30
【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】:溶液;原子吸收分光光度测定法;萃取;光度测量法(化学分析);冶金工艺学;试样制备;锰;火焰光度测定法;氧化铝;含量测定;校正
【英文主题词】:Aluminium;Aluminiumoxide;Atomicabsorptionspectrometry;Atomicabsorptionspectrophotometry;Chemicalanalysisandtesting;Determinationofcontent;Manganese;Production;Spectrophotometry
【摘要】:ThisInternationalStandardspecifiesaflameatomicabsorp-tionmethodforthedeterminationofthemanganesecon-tentofaluminiumoxideprimarilyusedfortheproductionofaluminium.Themethodisapplicabletoproductsofwhichthemanga-nesecontent,expressedasMn,isbetween0,0002and0,005%(m/m)(0,000258and0,00646%(m/m),express-edasMnO).NOTE—Iftheapparatusavailabledoesnothaveasufficientsensi-tivityforthelowercontentsofmanganese,itisrecommendedthatthereshouldbepriorextractionofthemanganese,bythemethodspecifiedinannexA.
【中国标准分类号】:G13
【国际标准分类号】:71_100_10
【页数】:8P;A4
【正文语种】:英语
【英文标准名称】:High-voltagedirectcurrent(HVDC)systems-GuidebooktothespecificationanddesignevaluationofACfilters
【原文标准名称】:高压直流系统(HVDC).交流滤波器规范和设计评价用指导手册
【标准号】:IEC/TR62001-2009
【标准状态】:现行
【国别】:国际
【发布日期】:2009-10
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC22F
【标准类型】:()
【标准水平】:()
【中文主题词】:交流电流;交流电滤波器;载(波)频(率);直流电流;直流电传输;电力系统;电力传输;电气工程;电子工程;能源运输;设备;过滤器;谐波;高电压;高压线路;工作性能;电力电子学;功率损耗;提供者;无线电干扰;可靠性;规范(验收);供应商;电信;三相电流;传输系统
【英文主题词】:Alternatingcurrent;Alternatingcurrentfilters;Carrierfrequency;Directcurrent;Direct-currentpowertransmission;Electricpowersystems;Electricpowertransmission;Electricalengineering;Electronicengineering;Energytransmission;Equipment;Filters;Harmonics;Highvoltage;High-voltagelines;Performanceinservice;Powerelectronics;Powerlosses;Providers;Radiodisturbances;Reliability;Specification(approval);Suppliers;Telecommunications;Three-phasecurrent;Transmissionsystems
【摘要】:
【中国标准分类号】:F21
【国际标准分类号】:29_200;29_240_99;31_160
【页数】:213P;A4
【正文语种】:英语
【英文标准名称】:StandardGuideforX-RayComptonScatterTomography
【原文标准名称】:X射线康普顿散射断层摄影的标准指南
【标准号】:ASTME1931-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E07.01
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:back-scatter;comptonscattertomography;computedtomography;CST;radiologic;radioscopic;sliceimage;tomography;CST(Comptonscattertomography);Imageanalysis;Radioisotopes;Radiologicalexamination;Sliceimage;Tomography;X-rayComptonscatter
【摘要】:PrincipalAdvantageofComptonScatterTomography8212;TheprincipaladvantageofCSTistheabilitytoperformthree-dimensionalX-rayexaminationwithouttherequirementforaccesstothebacksideoftheexaminationobject.CSToffersthepossibilitytoperformX-rayexaminationthatisnotpossiblebyanyothermethod.TheCSTsub-surfacesliceimageisminimallyaffectedbyexaminationobjectfeaturesoutsidetheplaneofexamination.Theresultisaradioscopicimagethatcontainsinformationprimarilyfromthesliceplane.Scatteredradiationlimitsimagequalityinnormalradiographicandradioscopicimaging.ScatterradiationdoesnothavethesamedetrimentaleffectuponCSTbecausescatterradiationisusedtoformtheimage.Infact,themoreradiationtheexaminationobjectscatters,thebettertheCSTresult.LowsubjectcontrastmaterialsthatcannotbeimagedwellbyconventionalradiographicandradioscopicmeansareoftenexcellentcandidatesforCST.VeryhighcontrastsensitivitiesandexcellentspatialresolutionarepossiblewithCSTtomography.Limitations8212;Aswithanynondestructivetestingmethod,CSThasitslimitations.Thetechniqueisusefulonreasonablythicksectionsoflow-densitymaterials.Whilea25mm(1in.)depthinaluminumor50mm(2in.)inplasticisachievable,theexaminationdepthisdecreaseddramaticallyasthematerialdensityincreases.Properimageinterpretationrequirestheuseofstandardsandexaminationobjectswithknowninternalconditionsorrepresentativequalityindicators(RQIs).Theexaminationvolumeistypicallysmall,ontheorderofafewcubicinchesandmayrequireafewminutestoimage.Therefore,completelyexamininglargestructureswithCSTrequiresintensivere-positioningoftheexaminationvolumethatcanbetime-consuming.Aswithotherpenetratingradiationmethods,theradiationhazardmustbeproperlyaddressed.1.1Purpose8212;ThisguidecoversatutorialintroductiontofamiliarizethereaderwiththeoperationalcapabilitiesandlimitationsinherentinX-rayComptonScatterTomography(CST).AlsoincludedisabriefdescriptionofthephysicsandtypicalhardwareconfigurationforCST.1.2Advantages8212;X-rayComptonScatterTomography(CST)isaradiologicnondestructiveexaminationmethodwithseveraladvantagesthatinclude:1.2.1TheabilitytoperformX-rayexaminationwithoutaccesstotheoppositesideoftheexaminationobject;1.2.2TheX-raybeamneednotcompletelypenetratetheexaminationobjectallowingthickobjectstobepartiallyexamined.Thickexaminationobjectsbecomepartoftheradiationshieldingtherebyreducingtheradiationhazard;1.2.3Theabilitytoexamineandimageobjectsubsurfacefeatureswithminimalinfluencefromsurfacefeatures;1.2.4Theabilitytoobtainhigh-contrastimagesfromlowsubjectcontrastmaterialsthatnormallyproducelow-contrastimageswhenusingtraditionaltransmittedbeamX-rayimagingmethods;and1.2.5Theabilitytoobtaindepthinformationofobjectfeaturestherebyprovidingathree-dimensionalexamination.Theabilitytoobtaindepthinformationpresupposestheuseofahighlycollimateddetectorsystemhavinganarrowangleofacceptance.1.3Applications8212;Thisguidedoesnotspecifywhichexaminationobjectsaresuitable,orunsuitable,forCST.Aswithmostnondestructiveexaminationtechniques,CSTishighlyapplicationspecifictherebyrequiringthesuitabilityofthemethodtobefirstdemonstratedintheapplicationlabor......
【中国标准分类号】:N78
【国际标准分类号】:35_240_80
【页数】:13P.;A4
【正文语种】:英语
