简介:Liquid-solid(L-S)masstransfercoefficients(Ks)werecharacterizedinagas-liquid-solid(G-L-S)three-phasecountercurrentmagneticallystabilizedbed(MSB)usingamorphousalloySRNA-4asthesolidphase.Effectsofsuperficialliquidvelocity,superficialgasvelocity,magneticfieldstrength,liquidviscosityandsurfacetensionwereinvestigated.ExperimentalresultsindicatedthattheexternalmagneticfieldincreasedKsinthree-phaseMSB,ascomparedtothoseinconventionalG-L-Sfluidizedbeds;thatKsincreasedwithmagneticfieldstrength,superficialgasandliquidvelocitiesanddecreasedwithliquidviscosityandsurfacetension;andthatKsshoweduniformaxialandradialdistributionsexceptforsmallincreasesclosetothewall.DimensionlesscorrelationswereestablishedtoestimateKsoftheG-L-ScountercurrentMSBusingSRNA-4catalyst,withanaverageerrorof3.6%.
简介:基于Lyapunov-Schmidt方法求出给定方程的分岐方程,Newton迭代得到其在分岐点附近的近似非平凡解枝,得到了满意的结果.
简介:Analysisoftheissuecallsforsomequestionsofmethodology.First,thelawofhistoricaldevelopmentteachesthatallcountries,nomatterhowstrongtheymaybe,willeventuallydecline.SothepointisnotwhethertheUnitedStateswillbeanexception,butwhenandhowwillthedayofreckoningdescendontheworld'scurrentsolesuperpower.
简介:目的:观察超短波加中频脉冲电、磁热加低周波、牵引加针灸三种治疗方法治疗L5-S1椎间盘中央型突出的临床效果。方法:将90例L5一S1椎间盘中央型突出患者随机分为A组30例、B组30例和C组30倒。A组采用超短波加中频脉冲电治疗,B组采用磁热加低周波治疗,C组采用牵引加针灸治疗。对三组患者治疗前后采用目测类比评分法(visualanaloguescale,VAS)进行评分,并进行组间比较。结果:三组患者治疗后VAS指数均明显优于治疗前(P〈0.01),B组、C组治疗后VAS指数优于A组(P〈0.05)。结论:磁热加低周波、牵引加针灸治疗L5一S1椎间盘中央型突出效果优于超短波加中频脉冲电。