UL 751-1995 自动售货机

上一篇: UL 826-1995 家用电钟
下一篇: NF L17-952-1995 航空工业.飞机结构用合成纤维布.经纱上浆织物黏结的剥离强度

【英文标准名称】:SpecificationforAmorphousMagneticCoreAlloysSemi-ProcessedTypes
【原文标准名称】:半成品型非晶磁芯合金规范
【标准号】:ANSI/ASTMA901-1997
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:非晶形状态;磁芯;半成品;合金
【英文主题词】:semi-finishedproducts;amorphousstate;alloys;magneticcores
【摘要】:Thisspecificationcoversthegeneralrequirementstowhichflat-cast,amorphous,semi-processed,iron-basemagneticcorealloysmustconform.Thesealloysareproducedbyarapid-quenching,direct-castingprocess,resultinginmetalswithnon-crystallinestructure.Themetallicalloysaremadetomeetspecifiedmaximumcore-lossvaluesandareintendedprimarilyforcommercialpowerfrequency(50and60Hz)applicationsinmagneticdevices.Desirablecore-lossandpermeabilitycharacteristicsaredevelopedbyfurtherheattreatmentinamagneticfieldbythebuyer.Theheattreatmenttypicallyconsistsofheatingthematerialtoatemperatureof320to420?Cinadry,inertatmospherefor5to10min.Amagneticfieldmayberequiredduringannealingasdesignatedbythemanufacturer.Exactoptimumannealingconditionsdependontheprocessingofthematerialandthesizeandshapeofthedevice.Thechemical,magnetic,andphysicalpropertiesarelistedforreferenceonly.Theyaretypicalvaluesforaparticularalloyanddonotconstituteastandardspecificationforthatalloy.Someofthesealloysaresensitivetomechanicalstress.Caremustbeexercisedinminimizinganystressesonthematerialinitsfinalapplication,otherwise,itsmagneticpropertieswillbeimpairedsignificantly.Thisspecificationisdevelopedtoaidinthepurchaseoftransformergradeamorphousstrip.Itprovidesthechemical,physical,andmagneticparametersandproceduresforqualitycontroltests.Note-Formoreinformationonproceduresassociatedwiththisspecification,refertothefollowing:PracticesA34,A664,A700,andB490;TestMethodsA370andA773.Thisstandarddoesnotpurporttoaddressthesafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:L19
【国际标准分类号】:29_100_10;29_030
【页数】:
【正文语种】:英语


【英文标准名称】:Systemsandsoftwareengineering-Softwarelifecycleprocesses
【原文标准名称】:系统和软件工程.软件生命周期过程
【标准号】:ISO/IEC12207-2008
【标准状态】:现行
【国别】:国际
【发布日期】:2008-02
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:计算机软件;计算机;周期;数据处理;数据处理设备;定义;开发;情报系统;信息系统;信息技术;寿命;维修;软件;系统开发;系统工程
【英文主题词】:Computersoftware;Computers;Cycle;Dataprocessing;Dataprocessingequipment;Definitions;Developments;Informationsystems;Informationtechnology;Life(durability);Maintenance;Software;Systemdevelopment;Systemengineering
【摘要】:ThisInternationalStandardestablishesacommonframeworkforsoftwarelifecycleprocesses,withwell-definedterminology,thatcanbereferencedbythesoftwareindustry.Itcontainsprocesses,activities,andtasksthataretobeappliedduringtheacquisitionofasoftwareproductorserviceandduringthesupply,development,operation,maintenanceanddisposalofsoftwareproducts.Softwareincludesthesoftwareportionoffirmware.ThisInternationalStandardappliestotheacquisitionofsystemsandsoftwareproductsandservices,tothesupply,development,operation,maintenance,anddisposalofsoftwareproductsandthesoftwareportionofasystem,whetherperformedinternallyorexternallytoanorganization.Thoseaspectsofsystemdefinitionneededtoprovidethecontextforsoftwareproductsandservicesareincluded.ThisInternationalStandardalsoprovidesaprocessthatcanbeemployedfordefining,controlling,andimprovingsoftwarelifecycleprocesses.Theprocesses,activitiesandtasksofthisInternationalStandard--eitheraloneorinconjunctionwithISO/IEC15288mmayalsobeappliedduringtheacquisitionofasystemthatcontainssoftware.
【中国标准分类号】:L77
【国际标准分类号】:35_080
【页数】:123P;A4
【正文语种】:英语