SJ 1483-79 3CG140型PNP硅外延平面高频小功率低噪声三极管
作者:标准资料网 时间:2024-05-12 06:04:40 浏览:8523
来源:标准资料网
基本信息
标准名称: | 3CG140型PNP硅外延平面高频小功率低噪声三极管 |
英文名称: | Detail specification for silicon PNP epitaxial planar high frequency low power noise transistors,Type 3CG140 |
中标分类: |
能源、核技术 >>
能源、核技术综合 >>
技术管理 |
发布日期: | 1979-09-11 |
实施日期: | 1980-06-01 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
出版日期: | 1900-01-01 |
页数: | 3页 |
适用范围
没有内容
前言
没有内容
目录
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引用标准
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所属分类: 能源 核技术 能源 核技术综合 技术管理
【英文标准名称】:StandardTestMethodsforApparentPorosity,LiquidAbsorption,ApparentSpecificGravity,andBulkDensityofRefractoryShapesbyVacuumPressure
【原文标准名称】:用真空压力法测定成型耐火材料表观空隙率、吸水性、表观比重和体密度的标准试验方法
【标准号】:ASTMC830-2000(2006)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2000
【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】:C08.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:apparentporosity;apparentspecificgravity;bulkdensity;hydration;refractoryshapes;vacuumpressure;waterabsorption;Bulkdensity;Density--carbon/graphite;Liquidabsorption;Porosity--apparent;Refractories(general);Specificgravity--refr
【摘要】:Apparentporosity,waterabsorption,apparentspecificgravity,andbulkdensityareprimarypropertiesofrefractoryshapes.Thesepropertiesarewidelyusedintheevaluationandcomparisonofproductqualityandaspartofthecriteriaforselectionanduseofrefractoryproductsinavarietyofindustrialapplications.Thesetestmethodsareusedfordetermininganyorallofthesepropertiesandareparticularlyusefulfortestinghydratableproducts.Thesetestmethodsareprimarystandardmethodsthataresuitableforuseinqualitycontrol,researchanddevelopment,establishingcriteriaforandevaluatingcompliancewithspecifications,andprovidingdatafordesignpurposes.Fundamentalassumptionsinherentinthesetestmethodsare:Thetestspecimensconformtotherequirementsforsize,configuration,andoriginalfaces,Theopenporesofthetestspecimensarefullyimpregnatedwithliquidduringthevacuum-pressuretreatment,andTheblottingofthesaturatedtestspecimensisperformedasspecifiedinaconsistentanduniformmannertoavoidwithdrawingliquidfromthepores.Deviationfromanyoftheseassumptionsadverselyaffectsthetestresults.Inlaboratorystudiesinvolvingcastablespecimen,abiaswasnotedbetweenformed2X2X2x2013;in(50X50X50x2013;mm)andspecimensquarteredfromlarger9X4.5X2.5x2013;in(228X114X64x2013;mm)castspecimens.Additionally,anerrorintheapparentporositydeterminationwasfoundoncastableswheneverthespecimenswereheatedto1500x00B0;F(816x00B0;C)andthenexposedtowaterasasaturationmedia.Theerrorwasattributedtoreactivityofcementwithwaterandsubsequentre-hydrationofcementphases.Thehigherthecementlevelofthecastable,thegreatertheerrornoted.Itwasconcludedthatanerrorinporosityvaluescouldoccurforrefractorymaterialshavingapotentialtoformhydratedspecieswithwater.Testingunderthesameconditionsinkeroseneproducedresultsthatwerebelievedtobemoreaccurate,butthedatasuggestedthatthekerosenemightnothavesaturatedtheopenporesofcastspecimenasreadilyaswater.SupportingdatawerefiledatASTMheadquartersandcanbeobtainedbyrequestingresearchreport1014.Certainprecautionsmustbeexercisedininterpretingandusingresultsfromthesetestmethods.Allfourpropertyvaluesareinterrelatedbyatleasttwoofthethreebasedatavaluesgeneratedduringtesting.Thus,anerrorinanybasedatavaluewillcauseanerrorinatleastthreeofthepropertyvaluesforagiventestspecimen.Certainoftheproperties,thatis,apparentspecificgravityandbulkdensity,arefunctionsofotherfactorssuchasproductcomposition,compositionalvariabilitywithinthesameproduct,imperviousporosity,andtotalporosity.Generalizationsonorcomparisonsofpropertyvaluesshouldbejudiciouslymadebetweenlikeproductstestedbythesetestmethodsorwithfullrecognitionofpotentiallyinherentdifferencesbetweentheproductsbeingcomparedorthetestmethodused.Whenaliquidotherthanwaterisused,suchastypesofkeroseneormineralspirits,specificgravitymustbeknownbyeitherdeterminationormonitoringonacontrolledbasis.Specificgravitywillchangeduetodifferentgradesofliquids,evaporation,orcontaminationwithdirtorforeignmaterial.Thetestshouldnotberuniftheliquidbecomesdirty,foamy,orchangescolor,becauseforeignparticlescanblockporesandpreventimpregnationofthesample.1.1Thesetestmethodscoverthedeterminationofthefollowingpropertiesofrefractoryshapes:1.1.1Apparen......
【中国标准分类号】:Q40
【国际标准分类号】:81_080
【页数】:5P.;A4
【正文语种】:英语
基本信息
标准名称: | 闭式冷挤压压力机 技术条件 |
替代情况: | 被JB/T 2936.2-1999代替 |
发布日期: | |
实施日期: | 2003-10-01 |
首发日期: | |
作废日期: | 2000-01-01 |
出版日期: | |
页数: | 10页 |
适用范围
没有内容
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类: 机械 通用加工机械与设备 锻压机械