基本信息
| 标准名称： | 银耳中米酵菌酸的测定 |
| 英文名称： | Determination of bongkrekic acid in tremella fuciformis berk |
| 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
|
| 替代情况： | GB/T 11675-1989部分 |
| 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： | 2003-08-11 |
| 实施日期： | 2004-01-01 |
| 首发日期： | 1989-09-05 |
| 作废日期： | 1900-01-01 |
| 主管部门： | 卫生部 |
| 提出单位： | 中华人民共和国卫生部 |
| 归口单位： | 中华人民共和国卫生部 |
| 起草单位： | 河南省食品卫生监督检验所 |
| 起草人： | 任中善、马军、赵国庆、张丁、韦喜亭 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2004-01-01 |
| 页数： | 6页 |
适用范围
本标准规定了银耳中米酵菌酸的测定方法。本标准适用于银耳中米酵菌酸的测定。
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】:StandardTestMethodforDielectricBreakdownVoltageofInsulatingLiquidsUsingDiskElectrodes
【原文标准名称】:用圆盘电极测定绝缘液体介电击穿电压的标准试验方法
【标准号】:ASTMD877-2002(2007)
【标准状态】:现行
【国别】:
【发布日期】:2002
【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】:D27.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:试验;绝缘液体
【英文主题词】:breakdownvoltage;dielectricstrength;diskelectrodes;electricalinsulatingliquids;testcup
【摘要】:Thedielectricbreakdownvoltageisameasureoftheabilityofaninsulatingliquidtowithstandelectricalstress.Thepower-frequencybreakdownvoltageofaliquidisreducedbythepresenceofcontaminantssuchascellulosicfibers,conductingparticles,dirt,andwater.Alowresultinthistestmethodindicatesthepresenceofsignificantconcentrationsofoneormoreofthesecontaminantsintheliquidtested.SeeAppendixX1.Ahighbreakdownvoltagemeasuredinthistestmethoddoesnotnecessarilyindicatethattheamountofthecontaminantspresentinaliquidfromwhichthesamplewastakenaresufficientlylowforthesampledliquidtobeacceptableinallelectricalequipment.TestMethodD877isnotsensitivetolowlevelsofthesecontaminants.Breakdowninthistestmethodisdominatedbyeventsoccurringattheelectrodeedges.Thevoltagestressdistributionbetweentheparalleldiskelectrodesusedinthistestmethodarequasi-uniformandthereissubstantialstressconcentrationatthesharpedgesoftheflatdiskfaces.Thistestmethodmaybeusedforevaluationofinsulatingliquidsinequipmentthatisdesignedtobefilledwithunprocessedliquidsasdeliveredbyavendor.Thistestmethodisnotrecommendedforevaluationofthebreakdownvoltageofliquidsusedinequipmentthatrequirestheapplicationofvacuumandfilteringoftheoilbeforebeingplacedintoservice.TestMethodD1816shouldbeusedtodeterminethebreakdownvoltageoffilteredanddegassedliquids.Thistestmethodisusedinlaboratoryorfieldtests.Forfieldbreakdownresultstobecomparabletolaboratoryresults,allcriteriaincludingroomtemperature(20to30x00B0;C)mustbemet.1.1Thistestmethoddescribestwoprocedures,AandB,fordeterminingtheelectricalbreakdownvoltageofinsulatingliquidspecimens.Thebreakdowntestusesacvoltageinthepower-frequencyrangefrom45to65Hz.1.2Thistestmethodisusedtojudgeifthediskelectrodebreakdownvoltagerequirementsaremetforinsulatingliquids,asdeliveredfromthemanufacturer,thathaveneverbeenfilteredordried.SeeSpecificationD3487,SpecificationD4652,andGuideD5222fortheminimumspecifiedelectricalbreakdown.ThistestmethodshouldbeusedasrecommendedbyprofessionalorganizationstandardssuchasIEEEC57.106.1.3LimitationsoftheProcedures1.3.1Thesensitivityofthistestmethodtothegeneralpopulationofcontaminantspresentinaliquidsampledecreasesasappliedtestvoltagesusedinthistestmethodbecomegreaterthanapproximately25kVrms.1.3.2Iftheconcentrationofwaterinthesampleatroomtemperatureislessthan60%ofsaturation,thesensitivityofthistestmethodtothepresenceofwaterisdecreased.ForfurtherinformationrefertoRR:D27-1006.1.3.3Thesuitabilityforthistestmethodhasnotbeendeterminedforaliquid''sviscosityhigherthan900cStat40C.1.4ProcedureApplications1.4.1ProcedureAProcedureAisusedtodeterminethebreakdownvoltageofliquidsinwhichanyinsolublebreakdownproductseasilysettleduringtheintervalbetweentherequiredrepeatedbreakdowntests.Theseliquidsincludepetroleumoils,hydrocarbons,andaskarels(PCB)usedasinsulatingandcoolingliquidsintransformers,cables,andsimilarapparatus.ProcedureAmaybeusedtoobtainthedielectricbreakdownofsiliconefluidasspecifiedinTestMethodsD2225,providedthedischargeenergyintothesampleislessthan20mJ(millijoule)perbreakdownforfiveconsecutivebreakdowns.1.4.2ProcedureBThisprocedureisusedtodeterminethebreakdownvoltageofliquidsinwhichanyinsolublebreakdownproductsdonotcompletelysettlefromthe......
【中国标准分类号】:K15
【国际标准分类号】:29_040_10
【页数】:6P.;A4
【正文语种】: