简介:Inthepresentstudy,aseriesofregenerationconditionsandtheregenerationmechanismofmodifiedlakesedimentbiochar(Fe-KOH/LSB)catalystsforlow-temperaturecatalytichydrolysisofcarbondisulfide(CS2)wereinvestigated.TheresultsshowedthatRm-WNAmethodhadthebestregenerationeffect.Underoptimalregenerationconditions,thesulfurcapacity(13.86mg[s]/g[catalyst])ofregeneratedFe-KOH/LSBwasclosetothatoffreshFe-KOH/LSB(14.88mg[s]/g[cataiyst]).Thewaterwashingprocesscouldwashawayasmallnumberofsulfatesandalargenumberofalkalinegroups.TG-DTAandDRTFIRresultsindicatedthatthenitrogensweepingprocesscoulddecomposeFe2(SO4)3intoFe2O3,whichpartiallyrecoveredthecatalyticandtheadsorptiveabilities.CO2-TPDresultsindicatedthatthealkalisteepingprocessoffer-OHgroups,furtherimprovingthecatalyticandtheadsorptiveabilities.After3times-regeneration,thesulfurcapacityofFe-KOH/LSBreached13.31mg[s]/g[cataiyst],indicatingthattheRm-WNAmethodhadgoodstabilityfortherecoveryofthecatalyticactivity.BET,XPSandXRDresultsrevealedthatthedecreaseofthesulfurcapacityforregenerationwasattributedtothedecreaseoftheadsorptiveabilitiesofCandSiO2.
简介:摘要人脸识别技术在实际生活中应用广泛,本文首先回顾近年来人脸识别的一般方法超分辨率算法、基于稀疏表示的分类方法、基于核范数的矩阵回归方法,并分别指出现有方法的适用范围及其局限性。最后对现阶段人脸识别在实际应用中亟待解决的问题进行总结,并展望今后人脸识别研究的发展趋势。
简介:摘要本文分析了铁路牵引网的特点,并提出了利用频域分析法辨别故障性质的方案,通过大量的仿真实验分析,总结出不同故障性质下的波头极性和功率谱的特征。