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Photodegradation of xylene isomers:Kinetics,mechanism,secondary pollutant formation potential and health risk evaluation

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Journal of Environmental Sciences 2024年第2期136卷 658-669页

作者： Xiaoyan Chen Weikun Zhu sufen feng Jiangyao Chen Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong Technology Research Center for Photocatalytic Technology Integration and Equipment EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Photodegradation technology has been widely applied in the purification of industrial aromatic ***,whether this technology efficiently removes the pollutants to prevent secondary pollution and health risk is still ***,the photodegradation processes of three xylenes were compared under designed reaction atmospheres and light *** lamp showed poor photodegradation ability toward xylenes,no matter in N_(2) or N_(2)+O_(2)system,while much higher photodegradation performance of xylenes were obtained under ultraviolet(UV)and vacuum ultraviolet(VUV)irradiation,especially in N_(2)+O_(2)+VUV system,where 97.9%of m-xylene,99.0%of o-xylene or 87.5%of p-xylene with the initial concentration of 860 mg/m^(3) was removed within 240 *** xylenes underwent three processes of photo-isomerization,photodecomposition and photo-oxidation to produce intermediates of aromatics,alkanes and *** them,the photo-isomerization products showed the highest concentration percentage(e.g.,≥50%in o-xylene system),confirming that photo-isomerization reaction was the dominated photodegradation process of ***,these isomerized products not only contributed about 97%and91%to the formation potential of O3(OFP)and secondary organic aerosols(SOAFP),but also displayed obvious non-carcinogenic risk,although one of photodecomposition product—benzene showed the highest occupational exposure ***,the secondary pollution and health risks of photodegradation products of xylenes were non-ignorable,although the OFP,SOAFP and health risks of the generated products reduced at least 4.5 times in comparison with that of the degraded *** findings are helpful for the appropriate application of this technology in the purification of industrial organic waste gas.

关键词： Isomer aromatics Photodegradation Ozone formation Secondary organic aerosols Health risk

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课程思政背景下定积分的应用教学设计

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大学数学 2024年第1期40卷 119-124页

作者：路璐沈杰冯素芬北京工业职业技术学院基础教育学院北京100042

以高等数学中定积分求平面图形的面积为例,提出课程思政背景下的一种教学设计架构.讲述中国冬奥故事,传递中国声音,激发学生民族自豪感,将家国情怀厚植于学生心中.在知识传授的过程中,以问题意识引领学生,启发学生主动发现问题、提出问... 详细信息

以高等数学中定积分求平面图形的面积为例,提出课程思政背景下的一种教学设计架构.讲述中国冬奥故事,传递中国声音,激发学生民族自豪感,将家国情怀厚植于学生心中.在知识传授的过程中,以问题意识引领学生,启发学生主动发现问题、提出问题、分析问题、解决问题,从而培养学生主动思考、积极探索的科学精神.注重知识的应用,在实践中实现课程思政,达到润物无声的育人效果.

关键词：课程思政高等数学微元法

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Modifying effects and mechanisms of superfine stainless wires on microstructures and mechanical properties of ultra-high performance seawater sea-sand concrete

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Science China Technological Sciences 2024年第10期67卷 3205-3220页

作者： YU feng DONG sufen ASHOUR Ashraf DING SiQi HAN BaoGuo School of Infrastructure Engineering Dalian University of Technology Faculty of Engineering & Informatics University of Bradford Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

Ultra-high-performance seawater sea-sand concrete（UHPSSC） presents a prospective solution to address the natural resource shortage in marine infrastructure construction. To eliminate the corrosion risk of steel fibers and broaden the applicability of UHPSSC, this study investigates the mechanical properties and free chloride ion content as well as microstructures of UHPSSC reinforced with superfine stainless wires（SSWs） under natural curing. The results indicate that 1.5% SSWs can remarkably improve the flexural strength and toughness of UHPSSC by 127% and 1724%, respectively, and mitigate the long-term strength degradation of UHPSSC. The strong interfacial bond between SSW and UHPSSC improves the compactness of UHPSSC, thus reducing the growth space for Ca（OH）2crystals and swelling hydration products generated by sulfate and magnesium ions. This can be supported by the observed reduction in the Ca/Si ratio of C–S–H gels, CH crystal orientation index, and ***, through mechanisms such as pull-out, rupture, overlapping network, and internal anchor interface, SSWs effectively prevent microcrack growth and propagation, transforming single long-connected microcracks into multiple-emission microcracks centered on SSW. Additionally, the free chloride ion content of the composites at 28 and 180 d meets the ACI 318-19 standard requirements for concrete exposed to seawater. This compliance is attributed to the chloride immobilization facilitated by Friedel's salt and C–S–H gels within the interfaces around SSWs and sea-sand. Consequently, SSWs-reinforced UHPSSC exhibits considerable potential for applications in sustainable marine infrastructures, demanding long-term mechanical properties and high durability.

关键词： ultra-high performance seawater sea-sand concrete superfine stainless wire mechanical properties chloride ion content microstructure

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有限策略型博弈中的相关策略与均衡的研究及应用

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北京工业职业技术学院学报 2016年第1期15卷 57-60,82页

作者：冯素芬北京工业职业技术学院基础教育学院北京100042

如何在均衡点集中进行选择和如何去定义均衡的概念,在处理均衡的选择问题中是相互联系的。讨论在有限策略型博弈中,局中人之间允许具有某些相关行动条件下所定义的均衡问题,规范地给出相关策略、具有合约的博弈、最小化最大值等概念,讨... 详细信息

如何在均衡点集中进行选择和如何去定义均衡的概念,在处理均衡的选择问题中是相互联系的。讨论在有限策略型博弈中,局中人之间允许具有某些相关行动条件下所定义的均衡问题,规范地给出相关策略、具有合约的博弈、最小化最大值等概念,讨论相关策略和具有合约博弈的联系并提出操作的方法;介绍策略激励约束,最后通过2个实例,讨论博弈决策艺术与占优策略在机制创新与公平实现方面的应用。

关键词：有限策略型博弈相关策略相关均衡策略激励占优策略

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教育信息化与高职数学教师的专业发展

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北京工业职业技术学院学报 2005年第4期4卷 76-80页

作者：冯素芬北京工业职业技术学院北京100042

信息化是当今世界经济和社会发展的大趋势,教师专业发展是教师教育改革的核心,是一个贯穿教师教学生涯的过程。结合自己的工作经验及数学教学的特点,对如何发展自己,包括教育理论、学科知识、信息技术、教育方略有一些思考。对高职数... 详细信息

信息化是当今世界经济和社会发展的大趋势,教师专业发展是教师教育改革的核心,是一个贯穿教师教学生涯的过程。结合自己的工作经验及数学教学的特点,对如何发展自己,包括教育理论、学科知识、信息技术、教育方略有一些思考。对高职数学教学的新模式进行了探讨,针对教学中的一些问题,提出了一些建议。

关键词：教育信息化教师专业发展高职教学

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有限策略型博弈中的相关策略与具有合约的博弈及其均衡

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南京师大学报（自然科学版） 2008年第3期31卷 33-38页

作者：刘肇军刘宗谦冯素芬贵州师范大学经济管理学院贵州贵阳550001 首都师范大学数学科学研究院北京100037

在Myerson介绍相关策略和具有合约的博弈的基础上,给出有限策略型博弈中相关策略、具有合约的博弈、最小化最大值、期望支付配置集和满足个人理性的期望支付配置集等定义,技术性地得出它们的一些性质;利用刘宗谦给出的混合策略性质及其... 详细信息

在Myerson介绍相关策略和具有合约的博弈的基础上,给出有限策略型博弈中相关策略、具有合约的博弈、最小化最大值、期望支付配置集和满足个人理性的期望支付配置集等定义,技术性地得出它们的一些性质;利用刘宗谦给出的混合策略性质及其记号,说明了相关策略与策略组合、内含签约的均衡与Nash均衡之间的关系,并提供其理论上的证明,得出操作的方法.并通过例子说明论文中的一些结果,验证了Fudenberg和Tir-ile所得出的相应结论.

关键词：相关策略合约配置均衡

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