基本信息
| 标准名称： | 保健食品中维生素B12的测定 |
| 英文名称： | Determination of vitamin B12 in health foods |
| 中标分类： |
医药、卫生、劳动保护 >>
卫生 >>
食品卫生 |
| ICS分类： |
食品技术 >>
食品综合
|
| 发布部门： | 中华人民共和国卫生部 中国国家标准化管理委员会 |
| 发布日期： | 2008-12-03 |
| 实施日期： | 2009-03-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 6 |
适用范围
本标准规定了保健食品中维生素B12的测定方法。本标准适用于片剂、胶囊、粉剂、功能性饮料类型保健食品中维生素B12的测定。
前言
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目录
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引用标准
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所属分类： 医药 卫生 劳动保护 卫生 食品卫生 食品技术 食品综合
【英文标准名称】:Hydraulicturbines,storagepumpsandpump-turbines-Caviatationpittingevaltuation-Evalutioninreactionturbines,storagepumpsandpumps-turbines
【原文标准名称】:水轮机,蓄能泵和水泵水轮机.气蚀损坏的评定.反击式水轮机,蓄能泵和水泵水轮机的评定
【标准号】:BSEN60609-1-2005
【标准状态】:现行
【国别】:英国
【发布日期】:2005-02-10
【实施或试行日期】:2005-02-10
【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】:气蚀;定义;定义(术语);电气工程;评估;水压机;冲击式涡轮机;水泵水轮机;泵;蓄水泵;测试;涡轮机;水轮机
【英文主题词】:Cavitationcorrosion;Definition;Definitions;Electricalengineering;Evaluations;Hydraulicmachines;Impulseturbines;Pumpturbines;Pumps;Storagepumps;Testing;Turbines;Waterturbines
【摘要】:ThispartofIEC60609servesasabasisfortheformulationofguaranteesappliedtocavitationpittingforreactionhydraulicturbines,storagepumpsandpump-turbines.Itaddressesthemeasurementandevaluationoftheamountofcavitationpittingoncertainspecifiedmachinecomponentsforgivenconditions,whicharedefinedinthecontractbyoutput,specifichydraulicenergy(E),speed,material,operation,etc.Thecavitation-pittingevaluationisbasedonthelossofmaterialduringagiventimeandunderaccuratelydefinedoperatingconditions.Allwettedsurfacesareconsidered.Thecontractdocumentsshallstatewhethercavitationpittingonthehydraulicmachineshouldorshouldnotbeanticipatedinallorinsomeoperatingranges.Guaranteesthatrestricttheextentofcavitationpittingarenecessaryinthecontractwhethercavitationpittingisanticipatedornot.1ExcludedtopicsandlimitationsThisstandarddoesnotcoverothereffectswhichcavitationmaypossiblyhaveonthemachinesuchas:-output,efficiency,vibration,mechanicalintegrity,andnoise;and-materialdefectsrevealedduringoperation.Materialdefectsrevealedbywearonthemachinesurfacesduringoperationarenotincludedinaguaranteeagainstcavitationpitting.2ConsiderationsconcerningchemicalcompositionofwaterItisassumedinthisstandardthatthewaterisnotchemicallyaggressive.Incaseswherethewaterisconsideredtobechemicallyaggressive,thecavitation-pittingguaranteeshallbegivenonthebasisofanagreedwateranalysis.Sincechemicalaggressivenessisdependentuponsomanypossiblechemicalcompositions,andthematerialsofthemachine,itisbeyondthescopeofthisstandardtosetparticularlimits.Ifitbecomesapparentinthecourseoflateranalysisthatthewaterisinfactmoreaggressivethantheagreedanalysisindicated,thismustbetakenintoconsiderationwhenevaluatingwhetherthecavitation-pittingguaranteeshavebeenmet.Ifcavitationpittingoccursinzoneswheredamagecanbeseparatelyattributabletochemicalorelectrochemicalcorrosion,suchdamageshallbeexcludedfromtheevaluationofcavitationpitting.Ifcavitationpittingoccursinzoneswheredamagecanbeproventohavebeenincreasedbychemicalorelectrochemicaleffectsadditionaltothosenormaltocavitationinwateroftheagreedanalysis,thensuchzonesshallbeexcludedfromtheevaluationofcavitationpitting.3ConsiderationsconcerningwatercontainingsolidsAbrasionduetowatercontaminatedwithsolids(forexample,sand)cannotbeconsideredascavitation-pittingdamage.Whenamachineoperatesinwatercontainingasignificantamountofsolids,theweightlossofmaterialwillbeintensifiedduetothejointactionofbothcavitationpitting(ifitexists)andabrasion.Thedegreeofintensifyingdestructiondependsonvariousaspects,suchassedimentconcentration,mineralcomposition,sizegradationandimpactparameters(i.e.relativevelocityandincidenceangle)aswellasthematerialcharacteristicsandhydraulicmachineoperationconditions.Whenasurfaceisalteredbyabrasionerosion,cavitation-pittingdamagecanbeinitiatedandacceleratedbecauseofthehydraulicshapechange.Withrespecttomeasurementofdamage,itisimportanttorealizethat,forcavitationerosiondamageandabrasionerosiondamage,theappearance,positionandmechanismofdestructionisnotsimilar.Ifcavitationpittingoccursinzoneswheredamagecanbeseparatelyattributedtoabrasion,suchdamageshallbeexcludedfromtheevaluationofcavitationpitting.Whiletheexamplesofamountsofcavitationpittingandmeasurementmethodsgiveninthisstandardcovercavitation-pittingdamageonly,itmustberecognizedthatsomehydrositesoperateinwaterthatcontainssignificantamountsofsolidsforatleastsomeportionoftheyear.Sinceerosionduetoabrasionissodependento
【中国标准分类号】:J71
【国际标准分类号】:23_080;27_140
【页数】:24P.;A4
【正文语种】:英语