【英文标准名称】:DigitalEnhancedCordlessTelecommunications(DECT)-Commoninterface(CI)-Part8:Speechcodingandtransmission(EndorsementoftheEnglishversionEN300175-8V1.4.2(1999-06)asGermanstandard)
【原文标准名称】:数字增强无线远程通信(DECT).通用界面(CI).第8部分:语音编码和传输
【标准号】:DINEN300175-8-2000
【标准状态】:作废
【国别】:德国
【发布日期】:2000-04
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:无线电工程;数字的;物理层;数字信号;通信;语言识别;数字工程;远程通信;电信;电信;接口;无线电话;无线电广播网;语音传输;数字电路;无线通信业务;电气工程;语言;无线的;电话系统;公共的;电话技术;欧洲的;无线电装置;编
【英文主题词】:
【摘要】:
【中国标准分类号】:M11
【国际标准分类号】:35_040;33_060_70
【页数】:1P;A4
【正文语种】:德语


【英文标准名称】:StandardTestMethodfor(AnalyticalProcedure)forDeterminingTransmissivityandStorageCoefficientofNonleakyConfinedAquifersbytheTheisNonequilibriumMethod
【原文标准名称】:非平衡法测定非越流性有侧限的蓄水层透射系数及储存系数的标准试验方法(分析程序)
【标准号】:ASTMD4106-1996(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1996
【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】:D18.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aquifertests;aquifers;controlwells;groundwater;hydraulicconductivity;observationwells;storagecoefficient;transmissivity;Aquifers;Coefficientofstorage;Confinedaquifers;Controlwells;Fieldtesting--groundwater/aquifers;Groundwater;H
【摘要】:Assumptions:Welldischargesataconstantrate,Q.Wellisofinfinitesimaldiameterandfullypenetratestheaquifer.Thenonleakyaquiferishomogeneous,isotropic,andaeriallyextensive.Anonleakyaquiferreceivesinsignificantcontributionofwaterfromconfiningbeds.Dischargefromthewellisderivedexclusivelyfromstorageintheaquifer.ThegeometryoftheassumedaquiferandwellconditionsareshowninFig.1.ImplicationsofAssumptions:Implicitintheassumptionsaretheconditionsofradialflow.Verticalflowcomponentsareinducedbyacontrolwellthatpartiallypenetratestheaquifer,thatis,thewellisnotopentotheaquiferthroughitsfullthickness.Ifthecontrolwelldoesnotfullypenetratetheaquifer,thenearestpiezometerorpartiallypenetratingobservationwellshouldbelocatedatadistance,r,beyondwhichverticalflowcomponentsarenegligible,whereaccordingtoReed(2):Thissectionappliestodistance-drawdowncalculationsoftransmissivityandstoragecoefficientandtime-drawdowncalculationsofstoragecoefficient.Ifpossible,computetransmissivityfromtime-drawdowndatafromwellslocatedwithinadistance,r,ofthepumpedwellusingdatameasuredaftertheeffectsofpartialpenetrationhavebecomeconstant.ThetimeatwhichthisoccursisgivenbyHantush(3)by:Fullypenetratingobservationwellsmaybeplacedatlessthandistancerfromthecontrolwell.Observationwellsmaybeonthesameoronvariousradiallinesfromthecontrolwell.TheTheismethodassumesthecontrolwellisofinfinitesimaldiameter.Also,itassumesthatthewaterlevelinthecontrolwellisthesameasintheaquifercontiguoustothewell.Inpracticetheseassumptionsmaycauseadifferencebetweenthetheoreticaldrawdownandfieldmeasurementsofdrawdownintheearlypartofthetestandinandnearthecontrolwell.Controlwellstorageisnegligibleafteratime,t,givenbytheEq6afterWeeks(4).where:rc

【中国标准分类号】:P13
【国际标准分类号】:93_160
【页数】:5P.;A4
【正文语种】:英语