The aim of this study was to investigate the oxidation reactivity and behavior of exhaust particulate matter(PM)from diesel engines.PM samples from two diesel engines(1K,CY4102)with different emission levels were coll...The aim of this study was to investigate the oxidation reactivity and behavior of exhaust particulate matter(PM)from diesel engines.PM samples from two diesel engines(1K,CY4102)with different emission levels were collected by a thermophoretic system and a quartz filter.The oxidation reactivity,oxidation behaviors,and physicochemical properties of the PM samples were analyzed using thermogravimetric analysis(TGA),high-resolution transmission electron microscopy(HRTEM),Fourier-transform infrared spectrometry(FTIR),and Raman spectroscopy.The results showed that there was a great difference in the oxidation reactivity of soot particles emitted by the two different diesel engines.A qualitative analysis of the factors influencing oxidation reactivity showed that the nanostructure,degree of graphitization,and relative concentration of aliphatic C—H functional groups were the most important factors,whereas no significant correlation was found between the primary particle size and activation energy of the diesel soot.Based on the oxidation behavior analysis,the diesel soot particles exhibited both internal and surface oxidation modes during the oxidation process.Surface oxidation was dominant during the initial stage,and as oxidation progressed,the mode gradually changed to internal oxidation.Internal oxidation mode of soot particles from the 1K engine was significantly higher than that of CY4102.展开更多
应用表面波频谱分析法,即spectral analysis of surface wave(SASW),对山西某公司原料厂区内高边坡的探测,采用专用计算软件对获得的数据进行成图,通过探测成果图计算分析厂区高边坡坡体空间结构的分布特征,划分高边坡范围内地层组成分...应用表面波频谱分析法,即spectral analysis of surface wave(SASW),对山西某公司原料厂区内高边坡的探测,采用专用计算软件对获得的数据进行成图,通过探测成果图计算分析厂区高边坡坡体空间结构的分布特征,划分高边坡范围内地层组成分布范围及地层分界面,后期通过现场岩土工程勘察钻探验证,结果表明SASW法在查明高边坡地下介质结构及工程地质勘察地层划分评价中是一种行之有效的勘探方法,这种方法可以为高边坡地质灾害的预测分析及加固治理提供可靠的科学依据。展开更多
基金the SINOPEC(124015)and the State Key Laboratory of Engines at Tianjin University(No.K2022-06).
文摘The aim of this study was to investigate the oxidation reactivity and behavior of exhaust particulate matter(PM)from diesel engines.PM samples from two diesel engines(1K,CY4102)with different emission levels were collected by a thermophoretic system and a quartz filter.The oxidation reactivity,oxidation behaviors,and physicochemical properties of the PM samples were analyzed using thermogravimetric analysis(TGA),high-resolution transmission electron microscopy(HRTEM),Fourier-transform infrared spectrometry(FTIR),and Raman spectroscopy.The results showed that there was a great difference in the oxidation reactivity of soot particles emitted by the two different diesel engines.A qualitative analysis of the factors influencing oxidation reactivity showed that the nanostructure,degree of graphitization,and relative concentration of aliphatic C—H functional groups were the most important factors,whereas no significant correlation was found between the primary particle size and activation energy of the diesel soot.Based on the oxidation behavior analysis,the diesel soot particles exhibited both internal and surface oxidation modes during the oxidation process.Surface oxidation was dominant during the initial stage,and as oxidation progressed,the mode gradually changed to internal oxidation.Internal oxidation mode of soot particles from the 1K engine was significantly higher than that of CY4102.
文摘应用表面波频谱分析法,即spectral analysis of surface wave(SASW),对山西某公司原料厂区内高边坡的探测,采用专用计算软件对获得的数据进行成图,通过探测成果图计算分析厂区高边坡坡体空间结构的分布特征,划分高边坡范围内地层组成分布范围及地层分界面,后期通过现场岩土工程勘察钻探验证,结果表明SASW法在查明高边坡地下介质结构及工程地质勘察地层划分评价中是一种行之有效的勘探方法,这种方法可以为高边坡地质灾害的预测分析及加固治理提供可靠的科学依据。
