【英文标准名称】:StandardTestMethodforElectricalConductivityandResistivityofaFlowingHighPurityWaterSample
【原文标准名称】:高纯度流动水样品电导性和电阻率的标准测试方法
【标准号】:ASTMD5391-1999(2005)
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:D19.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:水;试验;电导性;电阻
【英文主题词】:cation;conductivity;highpuritywatermeasurements;resistivity;specificconductance;specificresistance
【摘要】:Conductivitymeasurementsaretypicallymadeonsamplesofmoderatetohighionicstrengthwherecontaminationofopensamplesinroutinelaboratoryhandlingisnegligible.Underthoseconditions,standardtemperaturecompensationusingcoefficientsof1to3%ofreadingperdegreeCelsiusoverwideconcentrationrangesisappropriate.Incontrast,thistestmethodrequiresspecialconsiderationstoreducetracecontaminationandaccommodatesthehighandvariabletemperaturecoefficientsofpurewatersamplesthatcanrangeashighas7%ofreadingperdegreeCelsius.Inaddition,measuringinstrumentdesignperformancemustbeprovenunderhighpurityconditions.Thistestmethodisapplicablefordetectingtraceamountsofioniccontaminantsinwater.Itistheprimarymeansofmonitoringtheperformanceofdemineralizationandotherhighpuritywatertreatmentoperations.Itisalsousedtodetectioniccontaminationinboilerwaters,microelectronicsrinsewaters,pharmaceuticalprocesswaters,etc.,aswellastomonitorandcontrolthelevelofboilerandpowerplantcyclechemistrytreatmentchemicals.ThistestmethodsupplementsthebasicmeasurementrequirementsforTestMethodsD1125,D2186,andD4519.Atverylowlevelsofalkalinecontamination,forexample,0x2013;1x03BC;g/LNaOH,conductivityissuppressed,andcanactuallybeslightlybelowthetheoreticalvalueforpurewater.(13,14)4Alkalinematerialssuppressthehighlyconductivehydrogenionconcentrationwhilereplacingitwithlessconductivesodiumandhydroxideions.Thisphenomenonisnotaninterferencewithconductivityorresistivitymeasurementitselfbutcouldgivemisleadingindicationsofinferredwaterpurityinthisrangeifitisnotrecognized.1.1Thistestmethodcoversthedeterminationofelectricalconductivityandresistivityofhighpuritywatersamplesbelow10S/cm(above0.1Mohm-cm).Itisapplicabletobothcontinuousandperiodicmeasurementsbutinallcases,thewatermustbeflowinginordertoproviderepresentativesampling.Staticgrabsamplingcannotbeusedforsuchhighpuritywater.Continuousmeasurementsaremadedirectlyinpurewaterprocesslines,orinsidestreamsamplelinestoenablemeasurementsonhightemperatureorhighpressuresamples,orboth.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_60(EXAMINATIONOFWATERFORPHYSICALPROPERTIES)
【页数】:7P.;A4
【正文语种】:


【英文标准名称】:ImagequalityassuranceindiagnosticX-raydepartments-Part159:AcceptanceandconstancytestinginteleradiologyaccordingtoR?V
【原文标准名称】:X射线诊断科室中图像质量保证.第159部分:根据RV的X射线学中验收和稳定性测试
【标准号】:DIN6868-159-2009
【标准状态】:现行
【国别】:德国
【发布日期】:2009-03
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:验收检验;稳定性;稳定性试验;基准面;定义;数字的;文献;图像处理;图象质量;图像接收器;检验;医疗设备;医疗放射照相术;医学科学;职业安全;参数;图象描述信息;处理;投影法(制图);质量;质量保证;辐射防护;射线摄影胶片;射线照片;辐射学;额定值;规范(验收);测试;X射线仪;X射线技术
【英文主题词】:Acceptanceinspection;Constancy;Constancytesting;Datum;Definition;Definitions;Digital;Documentations;Imageprocessing;Imagequality;Imagerecepters;Inspection;Medicalequipment;Medicalradiography;Medicalsciences;Occupationalsafety;Parameters;Picturedescriptioninformation;Processing;Projection(drawing);Quality;Qualityassurance;Radiationprotection;Radiographicfilm;Radiographs;Radiology;Ratings;Specification(approval);Testing;X-rayapparatus;X-raytechnique
【摘要】:
【中国标准分类号】:C43
【国际标准分类号】:11_040_50;37_040_25
【页数】:28P.;A4
【正文语种】:德语