ANSI N542-1977 封闭放射源分类(NBS126)
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【英文标准名称】:SealedRadioactiveSources,Classification(NBS126)
【原文标准名称】:封闭放射源分类(NBS126)
【标准号】:ANSIN542-1977
【标准状态】:作废
【国别】:美国
【发布日期】:1977
【实施或试行日期】:
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:放射源;分类
【英文主题词】:classification;radioactivesources
【摘要】:
【中国标准分类号】:F48
【国际标准分类号】:13_280
【页数】:31P;A4
【正文语种】:英语
【英文标准名称】:StandardPracticeforRubberChemicals-DeterminationofInfraredAbsorptionCharacteristics
【原文标准名称】:橡胶助剂红外线吸收特性测定的标准实施规程
【标准号】:ASTMD2702-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:D11.11
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:炭黑;天然橡胶;红外线;工艺;橡胶;药液;测定;特性;合成橡胶
【英文主题词】:FTIR;infrared(IR)analysis;rubberchemicals
【摘要】:Thisprocedurecanbeusedforavarietyofapplications,includingidentifyingunlabeledmaterial,processcontrol,rawmaterialacceptance,productevaluation,andcompositionalchangeduringenvironmentaltesting.Rubberchemicalsvarywidelyintheirchemicalandphysicalproperties.Infraredspectrophotometersvaryinthepresentationofaspectrum(somearelinearwithabsorbance,otherswithtransmittance,someusegratingforenergydispersion,othersuseasodiumchlorideprism,someobtainaspectrumthroughamathematicalFourierTransform,andthelike).Forthesereasons,asingleuniversalmethodofspecimenpreparationandsetofinstrumentparametersisnotpossible.Byusingaspecificsamplingprocedureandoperatingconditions,agivenspectrophotometerwillgiveanabsorptioncurvethatischaracteristicoftherubberchemicalormixtureunderinvestigation.Theabilitytosuperimposetheinfraredspectrumofthetestspecimenuponthatofareferencespecimen,obtainedunderthesameconditions,isevidencethatthetwoareidentical.Thepresenceofadditionalabsorptionbandsineitherthetestspecimenorthereferencespecimenindicatesthepresenceofoneormoreadditionalcomponents.1.1Thispracticecoversasimple,rapidpracticetoprovetheidentityofarubberchemicalbeforeincorporationintoarubbermixbycomparisonofitsinfraredabsorptionspectrumwiththatofareferencespecimen.1.2Thistechniquecanalsobeusedtodetectgrosscontaminationorlargedifferencesinrubberchemicals.Thus,itcanprovideabasisforproducer-consumeragreement.1.3Wherever"infraredspectrophotometer"isused,"FourierTransformInfraredSpectrometer(FTIR)"mayalsobeunderstood.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G34
【国际标准分类号】:83_040_10
【页数】:4P.;A4
【正文语种】:
