简介:Inthispaper,takingitsturbulentexchangecoefficientasafunctionoftheLagrangiantimescaleandstandardvarianceoftheturbulenceinatmosphere,theatmosphericdispersionPDFmodelsareobtainedonthebasisofatmosphericdiffusionK-theory.Inthemodelthestatisticsofwindspeedaredirectlyusedasitsparametersinsteadofclassicdispersionparameters.Thebi-GaussianPDFisderivedinconvectiveboundarylayer(CBL),fromthestatisticsofverticalvelocityinbothofthedowndraftandupdraftregionsthatareinvestigatedtheoreticallyintheotherpartofthispaper.GivingthedrivenparametersoftheCBL(includingtheconvectivevelocityscalew*andthemixingdepthh_i)andthetime-averagedwindspeedatreleaselevel,thePDFmodelisabletosimulatethedistributionofconcentrationreleasedatanylevelsintheCBL.ThePDF’ssimulationsarefairlyconsistentwiththemeasurementsinCONDORSexperimentortheresultsbroughtoutbysomenumericalsimulations.
简介:摘要对数正太分布的随机变量的和在无线通信中广泛发生,而又很难精确计算参数,所以CDF存在许多近似,这些近似是基于将对数正太分布的随机变量和近似为另一个对数正太分布随机变量。一种基于正太对数正太概率纸的拟合的计算对数正太分布和的近似的新范式在下面的内容中将被介绍。