JJG (电子) 04003-1987 BJ2952A(JS-3A)型晶体管反向击穿电压测试仪(试行)
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基本信息
| 标准名称： | BJ2952A(JS-3A)型晶体管反向击穿电压测试仪(试行) |
| 中标分类： | 综合 >> 计量 >> 无线电计量 |
| 发布日期： | |
| 实施日期： | 1996-04-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 8页 |
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前言
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引用标准
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所属分类： 综合 计量 无线电计量
下载地址: 点击此处下载
【英文标准名称】:StandardGuideforConductingWholeSedimentToxicityTestswithAmphibians
【原文标准名称】:用两栖动物进行整体沉积物毒性试验的标准指南
【标准号】:ASTME2591-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E47.03
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:两栖纲;动物生物区;生物分析和试验;生物试验;生物水污染物;进行;沉积物;试验;毒性;水质;水质试验
【英文主题词】:amphibian;bioavailability
【摘要】:Whilefederalcriteriaandstatestandardsexistthatdefineacuteandchronicx201C;safex201D;levelsinthewatercolumn,effectslevelsinthesedimentarepoorlydefinedandmaybedependentuponnumerousmodifyingfactors.EvenwhereUSEPArecommendedWaterQualityCriteria(WQC,(35))arenotexceededbywater-borneconcentrations,organismsthatliveinornearthesedimentmaystillbeadverselyaffected(36).Therefore,simplymeasuringtheconcentrationofachemicalinthesedimentorinthewaterisofteninsufficienttoevaluateitsactualenvironmentaltoxicity.Concentrationsofcontaminantsinsedimentmaybemuchhigherthanconcentrationsinoverlyingwater;thisisespeciallytrueofhydrophobicorganiccompoundsaswellasinorganicionsthathaveastrongaffinityfororganicligandsandnegatively-chargedsurfaces.Higherchemicalconcentrationsinsedimentdonot,however,alwaystranslatetogreatertoxicityorbioaccumulation(37),althoughresearchalsosuggeststhatamendingsedimentwithorganicmatteractuallyincreasesthebioaccumulationofcontaminantparticles(38,39).OtherfactorsthatcanpotentiallyinfluencesedimentbioaccumulationandtoxicityincludepHmineralogicalcomposition,acid-volatilesulfide(AVS)andgrainsize(40,41).Laboratorytoxicitytestsprovideadirectandeffectivewaytoevaluatetheeffectsofsedimentcontaminationonenvironmentalreceptorswhileprovidingempiricalconsiderationofallofthephysical,chemicalandbiologicalparametersthatmayinfluencetoxicity.Amphibiansareoftenamajorecosystemcomponentofwetlandsaroundtheworld,howeverlimiteddataareavailableregardingtheeffectsofsediment-boundcontaminantstoamphibians(30-32,41-43).Laboratorystudiessuchastheproceduredescribedinthisstandardareonemeansofdirectlyassessingsedimenttoxicitytoamphibiansinordertoevaluatepotentialecologicalrisksinwetlands.Resultsfromsedimenttestingwiththisproceduremaybeusefulindevelopingchemical-specificsedimentscreeningvaluesforamphibians.Sedimenttoxicitytestcanbeusedtodemonstratethereactionoftestorganismstothespecificcombinationofphysicalandchemicalcharacteristicsinanenvironmentalmedium.Thebioavailabilityofchemicalsisdependentonanumberoffactors,whicharebothsite-specificandmedium-specific.Althoughmanyofthesefactorscanbeestimatedusingequilibriumpartitioningtechniques,itisdifficulttoaccountforallthephysicalandchemicalpropertieswhichcouldpotentiallyaffectbioavailability.Sedimenttoxicitytestsmaybeparticularlyapplicabletoevaluatinghydrophobiccompoundswhichmaynotreadilypartitionintothewatercolumn.SeeTable1forasummaryofadvantagesanddisadvantagesassociatedwithsedimenttoxicitytests.TABLE1AdvantagesandDisadvantagesforUseofSedimentTests(ModifiedfromTestMethodE1706)Advantages
Measurebioavailablefractionofcontaminant(s).
Provideadirectmeasureofeffectsonsediment-associatedreceptors(benthos,larvalamphibians),assumingnofieldadaptationorameliorationofeffects.
Limitedspecialequipmentisrequired.
Methodsarerapidandinexpensive.
Legalandscientificprecedenceexistforuse;USEPAandASTMstandardmethodsandguidesareavai........
【中国标准分类号】:Z12
【国际标准分类号】:13_060_70
【页数】:18P.;A4
【正文语种】:
【英文标准名称】:NumberPortabilityforPCS1900ShortMessageServiceandOtherServices
【原文标准名称】:PCS1900短信服务和其他服务的号码便携性
【标准号】:ANSIT1.711-1999
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【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】:呼叫号码;信息服务;数;PCS;轻便性能;短信服务;短信;通信;通信系统;电信
【英文主题词】:Callnumbers;Messageservices;Numbers;PCS;Portability;ShortMessageService;Shortmessages;Telecommunication;Telecommunicationsystems;Telecommunications
【摘要】:ThisstandarddefinesthePCS1900requirementsneededtosupportShortMessageServiceandotherServicesinaNumberPortabilityenvironment.Inthisdocument,thephrase"NumberPortabilityenvironment"referstoanenvironmentwhereServiceProvider
【中国标准分类号】:M11
【国际标准分类号】:
【页数】:
【正文语种】:英语
【原文标准名称】:用两栖动物进行整体沉积物毒性试验的标准指南
【标准号】:ASTME2591-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E47.03
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:两栖纲;动物生物区;生物分析和试验;生物试验;生物水污染物;进行;沉积物;试验;毒性;水质;水质试验
【英文主题词】:amphibian;bioavailability
【摘要】:Whilefederalcriteriaandstatestandardsexistthatdefineacuteandchronicx201C;safex201D;levelsinthewatercolumn,effectslevelsinthesedimentarepoorlydefinedandmaybedependentuponnumerousmodifyingfactors.EvenwhereUSEPArecommendedWaterQualityCriteria(WQC,(35))arenotexceededbywater-borneconcentrations,organismsthatliveinornearthesedimentmaystillbeadverselyaffected(36).Therefore,simplymeasuringtheconcentrationofachemicalinthesedimentorinthewaterisofteninsufficienttoevaluateitsactualenvironmentaltoxicity.Concentrationsofcontaminantsinsedimentmaybemuchhigherthanconcentrationsinoverlyingwater;thisisespeciallytrueofhydrophobicorganiccompoundsaswellasinorganicionsthathaveastrongaffinityfororganicligandsandnegatively-chargedsurfaces.Higherchemicalconcentrationsinsedimentdonot,however,alwaystranslatetogreatertoxicityorbioaccumulation(37),althoughresearchalsosuggeststhatamendingsedimentwithorganicmatteractuallyincreasesthebioaccumulationofcontaminantparticles(38,39).OtherfactorsthatcanpotentiallyinfluencesedimentbioaccumulationandtoxicityincludepHmineralogicalcomposition,acid-volatilesulfide(AVS)andgrainsize(40,41).Laboratorytoxicitytestsprovideadirectandeffectivewaytoevaluatetheeffectsofsedimentcontaminationonenvironmentalreceptorswhileprovidingempiricalconsiderationofallofthephysical,chemicalandbiologicalparametersthatmayinfluencetoxicity.Amphibiansareoftenamajorecosystemcomponentofwetlandsaroundtheworld,howeverlimiteddataareavailableregardingtheeffectsofsediment-boundcontaminantstoamphibians(30-32,41-43).Laboratorystudiessuchastheproceduredescribedinthisstandardareonemeansofdirectlyassessingsedimenttoxicitytoamphibiansinordertoevaluatepotentialecologicalrisksinwetlands.Resultsfromsedimenttestingwiththisproceduremaybeusefulindevelopingchemical-specificsedimentscreeningvaluesforamphibians.Sedimenttoxicitytestcanbeusedtodemonstratethereactionoftestorganismstothespecificcombinationofphysicalandchemicalcharacteristicsinanenvironmentalmedium.Thebioavailabilityofchemicalsisdependentonanumberoffactors,whicharebothsite-specificandmedium-specific.Althoughmanyofthesefactorscanbeestimatedusingequilibriumpartitioningtechniques,itisdifficulttoaccountforallthephysicalandchemicalpropertieswhichcouldpotentiallyaffectbioavailability.Sedimenttoxicitytestsmaybeparticularlyapplicabletoevaluatinghydrophobiccompoundswhichmaynotreadilypartitionintothewatercolumn.SeeTable1forasummaryofadvantagesanddisadvantagesassociatedwithsedimenttoxicitytests.TABLE1AdvantagesandDisadvantagesforUseofSedimentTests(ModifiedfromTestMethodE1706)Advantages
Measurebioavailablefractionofcontaminant(s).
Provideadirectmeasureofeffectsonsediment-associatedreceptors(benthos,larvalamphibians),assumingnofieldadaptationorameliorationofeffects.
Limitedspecialequipmentisrequired.
Methodsarerapidandinexpensive.
Legalandscientificprecedenceexistforuse;USEPAandASTMstandardmethodsandguidesareavai........
【中国标准分类号】:Z12
【国际标准分类号】:13_060_70
【页数】:18P.;A4
【正文语种】:
【英文标准名称】:NumberPortabilityforPCS1900ShortMessageServiceandOtherServices
【原文标准名称】:PCS1900短信服务和其他服务的号码便携性
【标准号】:ANSIT1.711-1999
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【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】:呼叫号码;信息服务;数;PCS;轻便性能;短信服务;短信;通信;通信系统;电信
【英文主题词】:Callnumbers;Messageservices;Numbers;PCS;Portability;ShortMessageService;Shortmessages;Telecommunication;Telecommunicationsystems;Telecommunications
【摘要】:ThisstandarddefinesthePCS1900requirementsneededtosupportShortMessageServiceandotherServicesinaNumberPortabilityenvironment.Inthisdocument,thephrase"NumberPortabilityenvironment"referstoanenvironmentwhereServiceProvider
【中国标准分类号】:M11
【国际标准分类号】:
【页数】:
【正文语种】:英语
