SAE AMS7906 Beryllium Bars, Rods, Tubing, and Shapes Standard Grade
作者:标准资料网 时间:2024-05-21 04:01:32 浏览:8771
来源:标准资料网
Product Code:SAE AMS7906
Title:Beryllium Bars, Rods, Tubing, and Shapes Standard Grade
Issuing Committee:Ams G Titanium And Refractory Metals Committee
Scope:This specification covers a beryllium in the form of bars, rods, tubing, and machined shapes from vacuum hot pressed powder. These materials have ben used typically for parts requiring a combination of high strength-to-weight ratio and high modulus of elasticity.
【英文标准名称】:StandardPracticeforClassificationofComputedRadiologySystems
【原文标准名称】:计算机辐射系统分类的标准实施规程
【标准号】:ASTME2446-2005(2010)
【标准状态】:现行
【国别】:美国
【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】:E07.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:basicspatialresolution.;classification;computedradiology;CR;filmsystemclassification;normalizedSNR;photo-stimulatedluminescence;PSL;Imagequality;Computedradiologysystems;Industrialradiographicfilmprocessing/testing;Phosphor
【摘要】:ThereareseveralfactorsaffectingthequalityofaCRimageincludingthespatialresolutionoftheIPsystem,geometricalunsharpness,scatterandcontrastsensitivity(signal-to-noiseratio),aswellassoftware.Thereareseveraladditionalfactors(forexample,scanningparameters),whichaffecttheaccuratereadingofimagesonexposedIPsusinganopticalscanner.ThispracticeistobeusedtoestablishaclassificationofCRsystemclassesonthebasisofanormalizedSNR.Duetothedifferencebetweenthemethods,itisrequiredtospecifytheCRsystemclasseswithspatialresolutionvalues.TheCRsystemclassesinthisdocumentdonotrefertoanyparticularmanufacturersx2019;imagingplates.ACRsystemclassresultsfromtheuseofaparticularimagingplatetogetherwiththeexposureconditions,particularlytotalexposure,thescannertypeandsoftwareandthescanningparameters.ThisclassificationsystemprovidesameanstocomparedifferingCRtechnologies,asiscommonpracticewithfilmsystems,whichguidestheusertotheappropriateconfiguration,IPandtechniquefortheapplicationathand.Theclassselectedmaynotmatchtheimagingperformanceofacorrespondingfilmclassduetothedifferenceinthespatialresolutionandscattersensitivity.Therefore,thepracticeshouldalwaysuseIQIsforproofofcontrastsensitivityandspatialresolution.Thequalityfactorscanbedeterminedmostaccuratelybythetestsdescribedinthispractice.Someofthesystemtestsrequirespecialtools,whichmaynotbeavailableinuserlaboratories.SimplertestsaredescribedforqualityassuranceinPracticeE2445,whicharedesignedforafasttestofthequalityofCRsystemsandlong-termstabilityandarerecommendedaspracticalusertests,shouldtheusernothavethespecialtoolsavailableasneededforthetestsinthispractice.ManufacturersofindustrialCRsystemswillusethispractice.UsersofindustrialCRsystemsmayalsoperformthetestsandmeasurementsoutlinedinthispractice,providedthattherequiredtestequipmentisusedandthemethodologyisstrictlyfollowed.AnyalternativemethodsmaybeappliedifequivalencetothemethodsofthispracticeisproventotheappropriateCognizantEngineeringOrganization.ThepublicationofCRsystemclasseswillenablespecifyingbodiesandcontractingpartiestoagreetoparticularsystemclass,asafirststepinarrivingattheappropriatesettingsofasystem,ortheselectionofasystem.ConfirmationofnecessaryimagequalityshallbeachievedbyusingPracticeE2033.1.1Thispracticedescribestheevaluationandclassificationofacomputedradiography(CR)system,aparticularphosphorimagingplate(IP),systemscannerandsoftware,incombinationwithspecifiedmetalscreensforindustrialradiography.Itisintendedtoensurethattheevaluationofimagequality,asfarasthisisinfluencedbythescanner/IPsystem,meetstheneedsofusers.1.2Thepracticedefinessystemteststobeusedtoclassifythesystemsofdifferentsuppliersandmakethemcomparableforusers.1.3TheCRsystemperformanceisdescribedbysignalandnoiseparameters.Forfilmsystems,thesignalisrepresentedbygradientandthenoisebygranularity.Thesignal-to-noiseratioisnormalizedbythebasicspatialresolutionofthesystemandispartofclassification.Thenormalizationisgivenbythescanningapertureof100x00B5;mdiameterforthemicro-photometer,whichisdefinedinTestMethodE1815forfilmsystem......
【中国标准分类号】:F80
【国际标准分类号】:19_100
【页数】:10P.;A4
【正文语种】:英语
Product Code:SAE AS9568
Title:Bolt, Machine - Double Hexagon Extended Washer Head, Drilled, Pd Shank, Ams 5731, .375-24 Unfj-3a
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available.
