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Hydroxyl radical production by abiotic oxidation of pyrite under estuarine conditions:The effects of aging,seawater anions and illumination

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Journal of Environmental Sciences 2024年第1期135卷 715-727页

作者： Ruixue Liu Yinshun Dai Yucheng Feng shiwen sun Xiaodong Zhang Chunjiang An Shan Zhao Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Department of Building Civil and Environmental EngineeringConcordia UniversityMontrealQC H3G 1M8Canada

Pyrite is widely distributed in estuarine sediments as an inexpensive natural Fenton-like reagent,however,the mechanism on the hydroxyl radical(HO^(·))production by pyrite under estuarine environmental conditions is still poorly *** batch experiments were performed to investigate the effects of estuarine conditions including aging(in air,in water),seawater anions(Cl^(-),Br^(-)and HCO_(3)^(-))and light on the HO^(·)production by pyrite *** one-electron transfer dominated the process from O_(2) to HO^(·)induced by oxidation of *** Fe(oxyhydr)oxide coatings on the surface of pyrite aged in air and water consumed hydrogen peroxide while mediating the electron transfer,and the combined effect of the two resulted in a suppression of HO^(·)production in the early stage of aging and a promotion of HO^(·)production in the later stage of *** of the surface oxide layers by aggressive anions was the main reason for the inhibition of HO^(·)production by Cl^(-)and Br^(-),and the generation of Cl^(·)and Br^(·)may also play a role in the scavenging of HO^(·).HCO_(3)^(-)increased the average rate of HO^(·)production through surface-CO_(2) complexes formed by adsorption on the surface of *** significant enhancement of HO^(·)production under light was attributed to the formation of photoelectrons induced by photochemical reactions on pyrite and its surface oxide *** findings provide new insights into the environmental chemical behavior of pyrite in the estuary and enrich the understanding of natural remediation of estuarine environments.

关键词： Hydroxyl radical Pyrite oxidation Aging Anions Irradiation

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A novel policy iteration algorithm for solving the optimal consensus control problem of a discrete-time multiagent system with unknown dynamics

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Science China(Information Sciences) 2023年第8期66卷 269-270页

作者： Wenkai XU Li WANG shiwen sun Chengyi XIA Zengqiang CHEN Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology The Engineering Research Center of Learning-Based Intelligent System Ministry of Education College of Artificial Intelligence Nankai University

At present, an increasing number of researchers have noticed the importance of optimal consensus control(OCC) of multiagent systems(MASs) because of their rich practical applications in various areas [1–4]. To accomp...

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The Discipline of Urban and Rural Planning in China: History and Prospect

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China City Planning Review 2018年第1期27卷 6-14页

作者： sun shiwen Li Caige College of Architecture and Urban Planning Tongji University

Based on a review on the social and cultural basis and the formation and evolution process of the urban-rural planning discipline in China, this paper summarizes the features of disciplinary development from the perspectives of development driving force, expression manner, knowledge characteristics and systemized development, etc. Then, aiming at the problems in the development of this discipline, the paper points out the direction for the future development. It emphasizes that, developing as an applied discipline, the urban-rural planning discipline should strengthen the production of its own disciplinary knowledge based on the comprehensive use of various relevant disciplinary knowledge, and proposes corresponding paths, means, and basic issues of knowledge production. The paper also points out that the output of the knowledge and achievements of China's urban-rural planning discipline to other disciplines and other countries is an important foundation for the further development of this discipline.

关键词： urban-rural planning discipline discipline history planning knowledge system China

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Effect of network structure to the convergence rate of agents in multi-agent systems 36

Effect of network structure to the convergence rate of agent...

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第36届中国控制会议

作者： Shasha Feng Li Wang shiwen sun Chengyi Xia Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology

ISBN: (纸本)9781538629185

In this paper, we probe into the influence of network structure on the convergence rate of agents in multi-agent systems, especially for the position and number of nodes of network on it. We discover some results of which kinds of networks are conductive to the faster convergence rate of agents in multi-agent systems. Firstly, if there is no ring in different networks where the number of nodes are same, then the network with fork nodes which are connected to the central position node is in favor of the faster convergence of agents;otherwise, the convergence rate of agents is quicker in the network without fork ***, it is inevitable for agents to converge more ane more slowly with the increasing of node number. One way to improve the convergence rate of agents is to enable the increased nodes to connect to the central position node. Finally, when both the position and the number of nodes of different networks are same, it can save communication cost to remove some edges in network under the condition that the convergence rate of agents is affected little. Therefore, we reveal that if the edges which do not connect to the central position directly are removed, then their impact on the convergence rate is little.

关键词： network structure convergence rate nodes number node position

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Relations between structural properties and synchronizability on local world dynamical networks

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Progress in Natural Science:Materials International 2007年第8期17卷 956-961页

作者： sun shiwen~(**) Liu Zhongxin Chen Zengqiang Yuan Zhuzhi (Department of Automation,Nankai University,Tianjin 300071,China) [a]Department of Automation Nankai University Tianjin China

In this paper,the effects of various structural properties on the synchronization of coupled oscillators with local-world coupling configurations are *** is found that for local world networks,the larger heterogeneity of the degree distribution,the enhanced interconnection of nodes,and the increased clustering do not improve the synchronizability of dynamical *** the con- trary,the increase of the maximum betweenness centrality appears to be responsible for the decrease of the synchronizability.

关键词： complex dynamical network local-world evolving model synchronizability structural properties betweenness centrality

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Epidemic spreading behavior with time delay on local-world evolving networks

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Frontiers of Electrical and Electronic Engineering in China 2008年第2期3卷 129-135页

作者： Chengyi XIA Zhongxin LIU Zengqiang CHEN shiwen sun Zhuzhi YUAN Department of Automation Nankai UniversityTianjin 300071China School of Computer Science and Technology Tianjin University of TechnologyTianjin 300191China

An improved susceptible-infected-susceptible(SIS)model in the local-world evolving network model is presented to study the epidemic spreading behavior with time delay,which is added into the infected *** local-world evolving model displays a transition from the exponential network to the scale-free network with respect to the degree *** typical delay regimes,i.e.,uniform and degree-dependent delays are incorporated into the SIS epidemic model to investigate the epidemic infection processes in the local-world net-work *** results indicate that the infection delay will promote the epidemic outbreaks,increase the prevalence and reduce the critical threshold of epidemic *** is also found that local-world size M will considerably influence the epidemic spreading behavior with time delay in the local-world network through large-scale numerical *** results are also of relevance to fight epidemic outbreaks.

关键词： epidemic spreading time delay local-world model complex networks infection dynamics

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Rifampicin inhibits apoptosis in rotenone-induced differentiated PC12 cells by ameliorating mitochondrial oxidative stress

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Neural Regeneration Research 2010年第4期5卷 251-256页

作者： shiwen Chen Yuanlin sun Zhifeng Zeng Enxiang Tao Department of Neurology Second Affiliated Hospital Sun Yat-Sen University Guangzhou 510120 Guangdong Province China

BACKGROUND： Previous studies have shown that rifampicin exhibits neuroprotective effects, but the precise mechanisms remain unclear. Rifampicin is thought to exert the neuroprotective effect as a hydroxyl free radical scavenger. OBJECTIVE： To investigate the protective effects of rifampicin pretreatment on rotenone-induced mitochondrial oxidative stress in differentiated PC12 ***, TIME AND SETrlNG： A repeated measure, cell-based study was performed at the Department of Neurology, Second Affiliated Hospital, sun Yat-sen University, China between December 2007 and November 2008. MATERIALS： PC12 cells were a kind gift from the Physiology Laboratory of Zhongshan Medical School, sun Yat-sen University, China. Rotenone and rifampicin were purchased from Sigma, USA. METHODS： PC12 cells were differentiated by culturing with 100 ng/mL 7S nerve growth factor for 9 days in Dulbecco＇s modified Eagle＇s medium/Nutrient Mix F12 （DMEM/F12） supplemented with 10% fetal bovine serum. The cells were assigned to six groups according to various treatment conditions： control, cultured with normal media; rifampicin group, treated with 300 pmol/L rotenone for 26 hours; rotenone group, treated with 2.5 pmol/L rotenone for 24 hours; rifampicin pretreatment groups, pretreated with 100, 200, and 300 pmol/L rifampicin for 2 hours, respectively, followed by 2.5 μmol/L rotenone for 24 *** OUTCOME MEASURES： Mitochondrial membrane potential was measured by fluorescence microscopy and flow cytometry, respectively, using rhodamine123 staining. Intracellular reactive oxygen species formation was analyzed by flow cytometry using 2＇, 7＇-dichlorofluorescin-diacetate staining, and intracellular reduced glutathione was measured with a microplate reader. Cell viability was determined by 3-（4, 5-dimethylthiazol-2-yl）-2, 5-diphenyltetrazolium bromide assay. Cell apoptosis was detected by Hoechst 33342 staining and flow cytometry. RESULTS： Increased apoptosis in rotenone-induced, differentiated,

关键词： rifampicin rotenone PC12 cells mitochondrial dysfunction oxidative stress apoptosis neural regeneration

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Economic Restructuring and the Further Development of Urban Planning

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China City Planning Review 1995年第2期12卷 2-6,15页

作者： sun shiwen(Department of Urban Planning, Tongji University)

ＥｃｏｎｏｍｉｃＲｅｓｔｒｕｃｔｕｒｉｎｇａｎｄｔｈｅＦｕｒｔｈｅｒＤｅｖｅｌｏｐｍｅｎｔｏｆＵｒｂａｎＰｌａｎｎｉｎｇＳｕｎＳｈｉｗｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＵｒｂａｎＰｌａｎｎｉｎｇ，ＴｏｎｇｊｉＵｎｉｖｅｒ... 详细信息

ＥｃｏｎｏｍｉｃＲｅｓｔｒｕｃｔｕｒｉｎｇａｎｄｔｈｅＦｕｒｔｈｅｒＤｅｖｅｌｏｐｍｅｎｔｏｆＵｒｂａｎＰｌａｎｎｉｎｇＳｕｎＳｈｉｗｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＵｒｂａｎＰｌａｎｎｉｎｇ，ＴｏｎｇｊｉＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａｃｔ：Ｔｈｉ...

关键词： Economic Restructuring and the Further Development of Urban Planning

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《周礼》中的中国古代城市规划制度

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城市规划 2012年第8期36卷 9-13,31页

作者：孙施文同济大学建筑与城市规划学院中国城市规划学会学术工作委员会

通过对《周礼》文本的解读,在对其记载的与城市规划过程相关的官职及其职责进行整理的基础上,较为全面地揭示了《周礼》所记载的中国古代城市规划制度的基本架构并展示了其中的复杂性。论文提出,要理解中国古代城市规划,不能仅局限于《... 详细信息

通过对《周礼》文本的解读,在对其记载的与城市规划过程相关的官职及其职责进行整理的基础上,较为全面地揭示了《周礼》所记载的中国古代城市规划制度的基本架构并展示了其中的复杂性。论文提出,要理解中国古代城市规划,不能仅局限于《考工记》的记载,需要有更为广泛的研究,《周礼》提供了其中更为本质性的一部分。

关键词：城市规划制度周礼古代中国

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中国城乡规划学科发展的历史与展望

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城市规划 2016年第12期40卷 106-112页

作者：孙施文同济大学建筑与城市规划学院

通过对中国城乡规划学科的社会文化基础、形成过程以及发展至今的历程进行回顾,从学科发展动力、表现形态以及知识特征和知识体系化发展等方面,对中国城乡规划学科发展的基本特征进行了总结,并针对中国城乡规划学科发展中存在的问题,指... 详细信息

通过对中国城乡规划学科的社会文化基础、形成过程以及发展至今的历程进行回顾,从学科发展动力、表现形态以及知识特征和知识体系化发展等方面,对中国城乡规划学科发展的基本特征进行了总结,并针对中国城乡规划学科发展中存在的问题,指出未来发展需要进一步努力的方向。论文强调,城乡规划作为应用性学科的发展,要在综合运用各相关学科知识的基础上,加强自身学科知识的生产,并指出知识生产的路径、相应方式以及需要关注的基础性问题;提出中国规划学科知识和成果向其他学科和其他国家输出是中国城乡规划学科进一步发展的重要基础。

关键词：城乡规划学科学科史规划知识体系中国

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