YD/T 798-1996 电信线路气压监测系统
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基本信息
| 标准名称： | 电信线路气压监测系统 |
| 中标分类： | 通信、广播 >> 通信设备 >> 通信线路设备 |
| 发布日期： | 1996-01-22 |
| 实施日期： | 1996-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 起草单位： | 邮电部北京通信件厂 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2004-04-18 |
| 页数： | 19页 |
| 书号： | 155066.2-10669 |
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前言
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所属分类： 通信 广播 通信设备 通信线路设备
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【英文标准名称】:StandardGuideforX-RayComptonScatterTomography
【原文标准名称】:X射线康普顿散射断层摄影的标准指南
【标准号】:ASTME1931-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:back-scatter;comptonscattertomography;computedtomography;CST;radiologic;radioscopic;sliceimage;tomography;CST(Comptonscattertomography);Imageanalysis;Radioisotopes;Radiologicalexamination;Sliceimage;Tomography;X-rayComptonscatter
【摘要】:PrincipalAdvantageofComptonScatterTomography8212;TheprincipaladvantageofCSTistheabilitytoperformthree-dimensionalX-rayexaminationwithouttherequirementforaccesstothebacksideoftheexaminationobject.CSToffersthepossibilitytoperformX-rayexaminationthatisnotpossiblebyanyothermethod.TheCSTsub-surfacesliceimageisminimallyaffectedbyexaminationobjectfeaturesoutsidetheplaneofexamination.Theresultisaradioscopicimagethatcontainsinformationprimarilyfromthesliceplane.Scatteredradiationlimitsimagequalityinnormalradiographicandradioscopicimaging.ScatterradiationdoesnothavethesamedetrimentaleffectuponCSTbecausescatterradiationisusedtoformtheimage.Infact,themoreradiationtheexaminationobjectscatters,thebettertheCSTresult.LowsubjectcontrastmaterialsthatcannotbeimagedwellbyconventionalradiographicandradioscopicmeansareoftenexcellentcandidatesforCST.VeryhighcontrastsensitivitiesandexcellentspatialresolutionarepossiblewithCSTtomography.Limitations8212;Aswithanynondestructivetestingmethod,CSThasitslimitations.Thetechniqueisusefulonreasonablythicksectionsoflow-densitymaterials.Whilea25mm(1in.)depthinaluminumor50mm(2in.)inplasticisachievable,theexaminationdepthisdecreaseddramaticallyasthematerialdensityincreases.Properimageinterpretationrequirestheuseofstandardsandexaminationobjectswithknowninternalconditionsorrepresentativequalityindicators(RQIs).Theexaminationvolumeistypicallysmall,ontheorderofafewcubicinchesandmayrequireafewminutestoimage.Therefore,completelyexamininglargestructureswithCSTrequiresintensivere-positioningoftheexaminationvolumethatcanbetime-consuming.Aswithotherpenetratingradiationmethods,theradiationhazardmustbeproperlyaddressed.1.1Purpose8212;ThisguidecoversatutorialintroductiontofamiliarizethereaderwiththeoperationalcapabilitiesandlimitationsinherentinX-rayComptonScatterTomography(CST).AlsoincludedisabriefdescriptionofthephysicsandtypicalhardwareconfigurationforCST.1.2Advantages8212;X-rayComptonScatterTomography(CST)isaradiologicnondestructiveexaminationmethodwithseveraladvantagesthatinclude:1.2.1TheabilitytoperformX-rayexaminationwithoutaccesstotheoppositesideoftheexaminationobject;1.2.2TheX-raybeamneednotcompletelypenetratetheexaminationobjectallowingthickobjectstobepartiallyexamined.Thickexaminationobjectsbecomepartoftheradiationshieldingtherebyreducingtheradiationhazard;1.2.3Theabilitytoexamineandimageobjectsubsurfacefeatureswithminimalinfluencefromsurfacefeatures;1.2.4Theabilitytoobtainhigh-contrastimagesfromlowsubjectcontrastmaterialsthatnormallyproducelow-contrastimageswhenusingtraditionaltransmittedbeamX-rayimagingmethods;and1.2.5Theabilitytoobtaindepthinformationofobjectfeaturestherebyprovidingathree-dimensionalexamination.Theabilitytoobtaindepthinformationpresupposestheuseofahighlycollimateddetectorsystemhavinganarrowangleofacceptance.1.3Applications8212;Thisguidedoesnotspecifywhichexaminationobjectsaresuitable,orunsuitable,forCST.Aswithmostnondestructiveexaminationtechniques,CSTishighlyapplicationspecifictherebyrequiringthesuitabilityofthemethodtobefirstdemonstratedintheapplicationlabor......
【中国标准分类号】:N78
【国际标准分类号】:35_240_80
【页数】:13P.;A4
【正文语种】:英语
【英文标准名称】:OneandTwo-Sided,HighDensity,Unformatted,90-mm(3.5in),5,3tpmm(135-tpi),FlexibleDiskCartridgefor15916bprUse-General,PhysicalandMagneticRequirements
【原文标准名称】:15916bpr用单、双面高密度非格式化、90mm(3.5in)、5.3tpmm(135-tpi)的盒式软盘.通用、物理和磁性要求
【标准号】:ANSIINCITS171-1989
【标准状态】:现行
【国别】:美国
【发布日期】:1989
【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】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:软盘;信息交换;信息处理;情报系统
【英文主题词】:Flexibledisks;Informationinterchange;Informationprocessing;Informationsystems
【摘要】:Thisstandardspecifiesthegeneral,physical,andmagneticrequirementsforinterchangeabilityoftheone-andtwo-sided,high-density,90-mm(3.5-in)(nominal)flexiblediskcartridgefor15916bits-per-radian(bpr)useasrequiredtoachieveunformatteddiskcartridgeinterchangeamongdiskdrivesusing80trackspersideandassociatedinformationprocessingsystems.Theone-andtwo-sidedflexiblediskenclosedinaprotectivecaseandhavingoneortworecordingsurfacesisofthetypeintendedspecificallyforusewithdigitalrecordingandreproducingequipmentemployingaccessmechanismscapableofpositioningtothesedatatracks.
【中国标准分类号】:L64
【国际标准分类号】:35_220_21
【页数】:30P.;A4
【正文语种】:英语
【原文标准名称】:X射线康普顿散射断层摄影的标准指南
【标准号】:ASTME1931-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:back-scatter;comptonscattertomography;computedtomography;CST;radiologic;radioscopic;sliceimage;tomography;CST(Comptonscattertomography);Imageanalysis;Radioisotopes;Radiologicalexamination;Sliceimage;Tomography;X-rayComptonscatter
【摘要】:PrincipalAdvantageofComptonScatterTomography8212;TheprincipaladvantageofCSTistheabilitytoperformthree-dimensionalX-rayexaminationwithouttherequirementforaccesstothebacksideoftheexaminationobject.CSToffersthepossibilitytoperformX-rayexaminationthatisnotpossiblebyanyothermethod.TheCSTsub-surfacesliceimageisminimallyaffectedbyexaminationobjectfeaturesoutsidetheplaneofexamination.Theresultisaradioscopicimagethatcontainsinformationprimarilyfromthesliceplane.Scatteredradiationlimitsimagequalityinnormalradiographicandradioscopicimaging.ScatterradiationdoesnothavethesamedetrimentaleffectuponCSTbecausescatterradiationisusedtoformtheimage.Infact,themoreradiationtheexaminationobjectscatters,thebettertheCSTresult.LowsubjectcontrastmaterialsthatcannotbeimagedwellbyconventionalradiographicandradioscopicmeansareoftenexcellentcandidatesforCST.VeryhighcontrastsensitivitiesandexcellentspatialresolutionarepossiblewithCSTtomography.Limitations8212;Aswithanynondestructivetestingmethod,CSThasitslimitations.Thetechniqueisusefulonreasonablythicksectionsoflow-densitymaterials.Whilea25mm(1in.)depthinaluminumor50mm(2in.)inplasticisachievable,theexaminationdepthisdecreaseddramaticallyasthematerialdensityincreases.Properimageinterpretationrequirestheuseofstandardsandexaminationobjectswithknowninternalconditionsorrepresentativequalityindicators(RQIs).Theexaminationvolumeistypicallysmall,ontheorderofafewcubicinchesandmayrequireafewminutestoimage.Therefore,completelyexamininglargestructureswithCSTrequiresintensivere-positioningoftheexaminationvolumethatcanbetime-consuming.Aswithotherpenetratingradiationmethods,theradiationhazardmustbeproperlyaddressed.1.1Purpose8212;ThisguidecoversatutorialintroductiontofamiliarizethereaderwiththeoperationalcapabilitiesandlimitationsinherentinX-rayComptonScatterTomography(CST).AlsoincludedisabriefdescriptionofthephysicsandtypicalhardwareconfigurationforCST.1.2Advantages8212;X-rayComptonScatterTomography(CST)isaradiologicnondestructiveexaminationmethodwithseveraladvantagesthatinclude:1.2.1TheabilitytoperformX-rayexaminationwithoutaccesstotheoppositesideoftheexaminationobject;1.2.2TheX-raybeamneednotcompletelypenetratetheexaminationobjectallowingthickobjectstobepartiallyexamined.Thickexaminationobjectsbecomepartoftheradiationshieldingtherebyreducingtheradiationhazard;1.2.3Theabilitytoexamineandimageobjectsubsurfacefeatureswithminimalinfluencefromsurfacefeatures;1.2.4Theabilitytoobtainhigh-contrastimagesfromlowsubjectcontrastmaterialsthatnormallyproducelow-contrastimageswhenusingtraditionaltransmittedbeamX-rayimagingmethods;and1.2.5Theabilitytoobtaindepthinformationofobjectfeaturestherebyprovidingathree-dimensionalexamination.Theabilitytoobtaindepthinformationpresupposestheuseofahighlycollimateddetectorsystemhavinganarrowangleofacceptance.1.3Applications8212;Thisguidedoesnotspecifywhichexaminationobjectsaresuitable,orunsuitable,forCST.Aswithmostnondestructiveexaminationtechniques,CSTishighlyapplicationspecifictherebyrequiringthesuitabilityofthemethodtobefirstdemonstratedintheapplicationlabor......
【中国标准分类号】:N78
【国际标准分类号】:35_240_80
【页数】:13P.;A4
【正文语种】:英语
【英文标准名称】:OneandTwo-Sided,HighDensity,Unformatted,90-mm(3.5in),5,3tpmm(135-tpi),FlexibleDiskCartridgefor15916bprUse-General,PhysicalandMagneticRequirements
【原文标准名称】:15916bpr用单、双面高密度非格式化、90mm(3.5in)、5.3tpmm(135-tpi)的盒式软盘.通用、物理和磁性要求
【标准号】:ANSIINCITS171-1989
【标准状态】:现行
【国别】:美国
【发布日期】:1989
【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】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:软盘;信息交换;信息处理;情报系统
【英文主题词】:Flexibledisks;Informationinterchange;Informationprocessing;Informationsystems
【摘要】:Thisstandardspecifiesthegeneral,physical,andmagneticrequirementsforinterchangeabilityoftheone-andtwo-sided,high-density,90-mm(3.5-in)(nominal)flexiblediskcartridgefor15916bits-per-radian(bpr)useasrequiredtoachieveunformatteddiskcartridgeinterchangeamongdiskdrivesusing80trackspersideandassociatedinformationprocessingsystems.Theone-andtwo-sidedflexiblediskenclosedinaprotectivecaseandhavingoneortworecordingsurfacesisofthetypeintendedspecificallyforusewithdigitalrecordingandreproducingequipmentemployingaccessmechanismscapableofpositioningtothesedatatracks.
【中国标准分类号】:L64
【国际标准分类号】:35_220_21
【页数】:30P.;A4
【正文语种】:英语