ASTM D 3744-1997 集料耐久性指数的测试方法
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时间:2024-05-10 13:44:57
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【英文标准名称】:TestMethodforAggregateDurabilityIndex
【原文标准名称】:集料耐久性指数的测试方法
【标准号】:ASTMD3744-1997
【标准状态】:作废
【国别】:美国
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:路面;道路建筑;路面(道路);精整;公路建设;材料;建筑;耐久性;表面;耐用试验;集料;施工材料;索引;承重面的表面修饰;额定值
【英文主题词】:aggregates;surfacefinishesforloadbearingplanes;endurancetests;construction;durability;constructionmaterials;indexes;materials;ratings;finishes;pavement;pavements(roads);surfaces;roadconstructi
【摘要】:
【中国标准分类号】:Q13
【国际标准分类号】:93_080_10
【页数】:
【正文语种】:英语
【英文标准名称】:PracticeforComputedTomographic(Ct)Examination
【原文标准名称】:计算机断层摄影(CT)检验惯例
【标准号】:ANSI/ASTME1570-1995
【标准状态】:现行
【国别】:美国
【发布日期】:1995
【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】:医学科学;计算机断层摄影
【英文主题词】:computedtomography;medicalsciences
【摘要】:Computedtomography(CT)maybeusedfornewapplications,or,inplaceoffilmradiography,providedthatthecapabilitytodisclosephysicalfeaturesorindicationsthatformtheaccept/rejectcriteriaisfullydocumentedandavailableforreview.TheCTsystemsaddressedinthispracticeutilizeasetoftransmissionmeasurementsmadealongasetofpathsprojectedthroughthetestobjectfrommanydifferentdirections.Eachofthetransmissionmeasurementswithintheseviewsisdigitizedandstoredinacomputer,wheretheyaresubsequentlyconditioned(forexample,normalizedandcorrected)andreconstructedbyoneofavarietyoftechniques.Anin-depthtreatmentofCTprinciplesisgiveninGuideE1441.Computedtomography(CT),aswithconventionalradiographyandradioscopicexamination,isbroadlyapplicabletoanymaterialortestobjectthroughwhichabeamofpenetratingradiationmaybepassedanddetected,includingmetals,plastics,ceramics,metallic/nonmetalliccompositematerial,andassemblies.TheprincipaladvantageofCTisthatitprovidesdensitometric(thatis,radiologicaldensityandgeometry)imagesofthincrosssectionsthroughanobject.Becauseoftheabsenceofstructuralsuperposition,imagesaremucheasiertointerpretthanconventionalradiologicalimages.ThenewusercanquicklylearntoreadCTdatabecauseimagescorrespondmorecloselytothewaythehumanmindvisualizes3Dstructuresthanconventionalprojectionradiology.Further,becauseCTimagesaredigital,theimagesmaybeenhanced,analyzed,compressed,archived,inputasdataintoperformancecalculations,comparedwithdigitaldatafromnondestructiveevaluation(NDE)modalities,ortransmittedtootherlocationsforremoteviewing,oracombinationthereof.Whilemanyofthedetailsaregenericinnature,thispracticeimplicitlyassumestheuseofpenetratingradiation,specificallyxrayand[gamma]ray.ThispracticeprovidesproceduralinformationforperformingCTexaminations.ThetechniquesandtheapplicationsassociatedwithCTexaminationarediverse.Thispracticeisnotintendedtobelimitingorrestrictive,butrathertoaddressthegeneraluseofCTtechnologyandtherebyfacilitateitsuse.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificsafetystatements,seeSection8,NBSHandbook114,andFederalStandards21CFR1020.40and29CFR1910.96.
【中国标准分类号】:C43
【国际标准分类号】:35_240_80
【页数】:
【正文语种】:英语
【英文标准名称】:Poly(methylmethacrylate)sheets-Types,dimensionsandcharacteristics-Castsheets
【原文标准名称】:聚甲烯丙烯酸酯板.型号、尺寸和特性.铸板
【标准号】:BSENISO7823-1-2000
【标准状态】:作废
【国别】:英国
【发布日期】:2000-12-15
【实施或试行日期】:2000-12-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:尺寸;聚甲基丙烯酸甲酯;厚度;聚丙烯酸酯;铸件;丙烯酸类树脂;薄板材;塑料
【英文主题词】:
【摘要】:
【中国标准分类号】:G33
【国际标准分类号】:83_140_10
【页数】:18P;A4
【正文语种】:英语