【英文标准名称】:AirInterfaceStandardforBroadbandDirectSequenceCDMAforFixedWirelessPSTNAccess-Layer1
【原文标准名称】:固定式无线PSTN访问用宽带直接顺序CDMA空中接口标准.1层
【标准号】:ANSIT1.716-2000
【标准状态】:现行
【国别】:美国
【发布日期】:2000
【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】:宽带网络;PSTN;电讯;电信;无线通信业务
【英文主题词】:Broadbandnetwork;PSTN;Telecommunication;Telecommunications;Wirelesscommunicationservices
【摘要】:ThisdocumentspecifiesthetransmitfunctionsofLayer1todefinetheairinterfaceforaBroadbandDirectSequenceCDMAsystemforFixedWirelessPSTNAccess(FWPA).ThisairinterfacesatisfiestherequirementsdefinedinT1.TR.67-2001forthesingle
【中国标准分类号】:M14
【国际标准分类号】:
【页数】:
【正文语种】:英语


【英文标准名称】:StandardPracticeforEvaluatingtheKineticBehaviorofIonExchangeResins
【原文标准名称】:离子交换树脂活性评价的标准惯例
【标准号】:ASTMD6302-1998(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【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】:D19.08
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:anionresin;cationresin;condensatepolishing;ionexchange;kinetics;leakage;mixedbed;Anionexchangeresins;Cationresin;Condensatepolishing;High-puritywater;Ionexchangematerials/applications;Kineticbehavior/characteristics/parameters;M
【摘要】:Thispracticeisintendedtoevaluatechangesintheperformanceofionexchangeresinsusedinmixedbedsoperatingaspolishingsystemsforsolutionsoflowionicstrength,typically,x003C;10mg/Ldissolvedsolids,thatareintendedtoproduceveryhighpurityeffluents.Itisrecommendedthatwhennewresinsareinstalledinaplantitbeusedtoprovideabaselineagainstwhichthefutureperformanceofthatresincanbejudged.Theconditionsofthistestmustbelimitingkinetically,suchthatkineticleakage,andnotequilibriumleakage,istested.Thisleakageisinfluencedbyacombinationofinfluentflowvelocityandconcentration,aswellasbeddepth.Itisrecommendedthatthepracticebefollowedwiththeresinratio,flowrate,andinfluentqualityasindicated.Thedesignoftheapparatuspermitsothervariationstobeusedthatmaybemoreappropriatetothechemicalsusedinaspecificplantandthenatureofitscoolingwater,butthecautionsandlimitationsnotedinthepracticemustbeaccommodated.Itispossiblethatthecationresincouldexperiencekineticsproblems.Inmanycases,however,theanionresinsaremorelikelytoexperiencethetypesofdegradationorfoulingthatcouldleadtoimpairedkinetics.Testingoffieldanionandcationresinstogetherisanoption,especiallywhenhistoricdataonthemixedbedwillbecompiled.Recognize,however,thatmanyvariablescanbeintroduced,makingitdifficulttointerpretresultsortocomparetohistoricalornewresindataonseparatecomponents.ProvisionismadeforcalculationofthemasstransfercoefficientintheAppendixX1.Whensuchcalculationistobemade,afullwetsieveanalysis,asdescribedinTestMethodsD2187,alsoisrequired.Electronicparticlesizingmaybesubstitutedifitisreferencedbacktothewetsievemethod.Thispracticeisintendedtosupplement,notdisplace,otherindicatorsofresinperformance,suchasexchangecapacity,%regeneration,andserviceexperiencerecords.1.1Thispracticeisintendedtoevaluatechangesinkineticperformanceofionexchangeresinsusedinmixedbedstoproducehighpuritywater.Withinstrictlimitations,italsomaybeusedforcomparingresinofdifferenttypes.Thisstandarddoesnotseektomimicactualoperatingconditions.Specificchallengesolutionsandconditionsarespecified.Attheoptionoftheuser,otherconditionsmaybetested.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:71_100_80
【页数】:6P.;A4
【正文语种】:英语