检索结果-南通市图书馆

Derivative-extremum analysis of current-potential curves showing electrochemical kinetics in the full reversibility range

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第1期34卷 544-549页

作者： fengjun yin Hong Liu Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Key Laboratory of Reservoir Aquatic Environment Chinese Academy of SciencesChongqing 400714China China University of Chinese Academy of Sciences Beijing 100049China

Derivative-extremum analysis(DEA) of j-E curves is a newly proposed method of half wave potential(E1/2) and activation feature extraction from steady-state voltammetry. Here, the DEA is demonstrated to be valid in the full range of reversibility using numerical simulations with a derived universal electrode equation, providing a novel perspective of electrochemical kinetics in the reversibility domain. The results reveal that E1/2is a better choice of the reference potential instead of equilibrium potential(Eeq) in electrode equations, especially since Eeqis meaningless in an irreversible case. The equations referenced with standard potential, E1/2and Eeq, are summarized in three tables, and their applications in parameter determinations are specified. Finally, reversibility is proved to be a relative measure between kinetic slowness and mass transport of electroactive species, and the reversibility classifications are proposed according to the DEA feature in the reversibility domain. This work, based on the DEA principle, refines the electrode equation forms and generalizes their applicability in the full range of reversibility.

关键词： Reversibility Electrochemical kinetics Half-wave potential Derivative-extremum analysis Parameter determinations

在线全文

学校读者我要写书评

暂无评论

A/O双污泥工艺脱氮性能

环境工程学报 2024年第3期18卷 799-807页

作者：韦皓天岳学海谭浩刘鸿殷逢俊重庆交通大学河海学院重庆400074 中国科学院重庆绿色智能技术研究院重庆400714 中国科学院重庆学院重庆400020

针对传统A/O(anaerobic/oxic)工艺中反硝化细菌对有机物的利用效率低、A_(2)N(anaerobic/anoxic-nitrification)工艺工序繁琐和出水氨氮浓度较高的问题,提出了一种泥水分离反应器,将双污泥体系与A/O工艺结合构建A/O双污泥工艺。对工艺... 详细信息

针对传统A/O(anaerobic/oxic)工艺中反硝化细菌对有机物的利用效率低、A_(2)N(anaerobic/anoxic-nitrification)工艺工序繁琐和出水氨氮浓度较高的问题,提出了一种泥水分离反应器,将双污泥体系与A/O工艺结合构建A/O双污泥工艺。对工艺运行过程的脱氮性能、微生物群落变化及氮素转化规律进行了研究,根据研究结果评估泥水分离反应器和A/O双污泥工艺在实际应用中的开发潜力,并总结工艺和反应器需要优化的问题,提出解决问题的思路。结果表明:在进水氮负荷为0.11 kg·(m^(3)·d)^(-1)条件下,工艺的氮去除负荷可以达到0.089 kg·(m^(3)·d)^(-1),NH_(4)^(+)-N去除率超过95%、COD去除率超过90%,TN去除率达到80%以上,该工艺能够实现长期稳定运行。反硝化过程反应速率是提升A/O双污泥工艺脱氮效率的限速步骤,强化有机物在缺氧池中的接触停留是有机物利用率提高的关键。因此,需要对现有碳源的投加方式、污水的进水方式或工艺的反应器数量进行优化,进一步提高工艺对碳源的利用效率。微生物群落结构表明陶厄氏菌(Thauera)、硝化螺杆菌(Nitrospira)、Caldilineaceae等硝化反硝化功能菌属与主导异养硝化-好氧反硝化过程的副球菌(Paracoccus)共同协作是维持高NH4+-N去除率和TN去除率的原因之一。综上所述,A/O双污泥工艺具有良好的脱氮性能,具备实际应用价值,同时该研究结果可为工艺及反应器存在的缺陷进行后续优化研究提供参考。

关键词： A/O双污泥工艺泥水分离脱氮性能内循环

同方期刊数据库

pH Overpotential for Unveiling the pH Gradient Effect of H^(+)/OH^(−)Transport in Electrode Reaction Kinetics

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第1期4卷 369-380页

作者： fengjun yin Ling Fang Hong Liu Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714 Key Laboratory of Reservoir Aquatic Environment Chinese Academy of SciencesChongqing 400714 University of Chinese Academy of Sciences Beijing 100049

The pH gradient caused by H^(+)/OH^(−)transport on an electrode surface is the key factor determining reaction performance,but its detailed impact on the electrode reaction kinetics has yet to be ***,the pH gradient effect was determined by developing electrode reaction equations,considering the overpotential assigned to the pH gradient called pH *** pH gradient effect was revealed to involve two aspects:(1)the Nernst pH overpotential,accounting for the common Nernst relationship with pH,and(2)the pH-dependent function of the electron-transfer coefficient(α_(pH)).Both parts were verified experimentally using oxygen reduction reaction and hydrogen evolution reaction,obviously,with differentα_(pH) ***α_(pH) function effect was clarified based on numerical calculations of the electrode reaction *** found that the effect could be assessed suitably by an apparent constant(α_(app))and a nonlinear fitting method proposed forα_(app) value *** results of this study provide the kinetic fundamentals of electrode reactions involving H^(+)/OH^(−)and contribute to the understanding and assessment of their performance with the H^(+)/OH^(−)transport effect.

关键词： pH overpotential pH gradient effect electrode reaction kinetics H^(+)and OH^(−)transport hydrogen evolution reaction oxygen reduction reaction

The j–pH diagram of interfacial reactions involving H+ and OH-

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第11期29卷 339-343页

作者： fengjun yin Hong Liu Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Key Laboratory of Reservoir Aquatic Environment Chinese Academy of SciencesChongqing 400714China University of Chinese Academy of Sciences Beijing 100049China

For aqueous interfacial reactions involving H+and OH-, the interfacial pH varies dynamically during the reaction process, which is a key factor determining the reaction performance. Herein, the kinetic relevance between the interfacial pH and reaction rate is deciphered owing to the success in establishing the transport equations of H+/OH- in unbuffered solutions, and is charted as a current(j)–pH diagram in the form of an electrochemical response. The as-described j–pH interplay is experimentally verified by the oxygen reduction and hydrogen evolution reactions. This diagram serves to form a panoramic graphic view of pH function working on the interfacial reactions in conjunction with the Pourbaix’s potential–pH diagram, and particularly enables a kinetic understanding of the transport effect of H+and OH-on the reaction rate and valuable instruction toward associated pH control and buffering manipulation.

关键词： j–pH diagram Interfacial reaction pH gradient H^+and OH^-transports Electrode reaction

DeepSI:A Sensitive-Driven Testing Samples Generation Method of Whitebox CNN Model for Edge Computing

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第3期29卷 784-794页

作者： Zhichao Lian fengjun Tian School of Cyber Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

In recent years,Deep Learning(DL)technique has been widely used in Internet of Things(IoT)and Industrial Internet of Things(IIoT)for edge computing,and achieved good *** more and more studies have shown the vulnerability of neural ***,it is important to test the robustness and vulnerability of neural *** specifically,inspired by layer-wise relevance propagation and neural network verification,we propose a novel measurement of sensitive neurons and important neurons,and propose a novel neuron coverage criterion for robustness *** on the novel criterion,we design a novel testing sample generation method,named DeepSI,which involves definitions of sensitive neurons and important ***,we construct sensitive-decision paths of the neural network through selecting sensitive neurons and important ***,we verify our idea by setting up several experiments,then results show our proposed method achieves superior performances.

关键词： neuron sensitivity Layer-wise Relevance Propagation(LRP) neural network verification deeplearning testing

Enhancing sensitivity of microbial fuel cell sensors for low concentration biodegradable organic matter detection:Regulation of substrate concentration,anode area and external resistance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第3期33卷 227-235页

作者： Yangyang Gao Sha Wang fengjun yin Pin Hu Xingzu Wang Yuan Liu Hong Liu Key Laboratory of Reservoir Aquatic Environment Chinese Academy of SciencesChongqing 400714China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China University of Chinese Academy of Sciences Beijing100049China

The relatively low sensitivity is an important reason for restricting the microbial fuel cell(MFC)sensors'application in low concentration biodegradable organic matter(BOM)*** startup parameters,including substrate concentration,anode area and external resistance,were regulated to enhance the sensitivity of MFC *** results demonstrated that both the substrate concentration and anode area were positively correlated with the sensitivity of MFC sensors,and an external resistance of 210Ωwas found to be optimal in terms of sensitivity of MFC *** MFC sensors had lower detection limit(1 mg/L)and higher sensitivity(Slope value of the linear regression curve was 1.02),which effectively overcome the limitation of low concentration BOM *** essential reason is that optimized MFC sensors had higher coulombic efficiency,which was beneficial to improve the sensitivity of MFC *** main impact of the substrate concentration and anode area was to regulate the proportion between electrogens and nonelectrogens,biomass and living cells of the anode *** external resistance mainly affected the morphology structure and the proportion of living cells of the *** study demonstrated an effective way to improve the sensitivity of MFC sensors for low concentration BOM detection.

关键词： Microbial fuel cell sensor High sensitivity Biodegradable organic matter Substrate concentration Anode area External resistance

基于精细化管理的新城地块机动车出入口管控研究——以南京南部新城为例

在线全文

学校读者我要写书评

暂无评论

现代城市研究 2022年第2期37卷 125-132页

作者：殷凤军彭佳吴爱民南京市南部新城开发建设管理委员会南京市城市与交通规划设计研究院股份有限公司

地块出入口设置的合理性关系到新城交通系统运行效率和用地开发效益,在倡导精细化城市治理和新城绿色低碳发展背景下,加强新城地块出入口管控十分必要。结合地块出入口设置的理论基础,文章探讨了新城地块出入口设置要求,基于全要素、全... 详细信息

地块出入口设置的合理性关系到新城交通系统运行效率和用地开发效益,在倡导精细化城市治理和新城绿色低碳发展背景下,加强新城地块出入口管控十分必要。结合地块出入口设置的理论基础,文章探讨了新城地块出入口设置要求,基于全要素、全过程和精细化管理理念和思路,提出了新城地块出入口管控目标与策略。构建了出入口管控体系与流程,并从交通系统整合设计、道路沿线机动车出入口布局模式与要求、不同类型地块出入口宽度设置标准、与其他交通市政设施融合设计等方面提出了管控技术方法。

关键词：新城地块出入口精细化管理交通系统整合设计接入管理

基于机理模型与数据模型融合的污水处理智能控制系统构建思路

在线全文

学校读者我要写书评

暂无评论

环境工程 2022年第6期40卷 138-144页

作者：殷逢俊徐泽宇刘鸿中国科学院重庆绿色智能技术研究院重庆400714

污水处理智能控制是水污染控制领域的前沿方向。人工智能技术的快速发展,为污水处理智能化控制系统研发注入了新的活力。当前亟须探索污水处理机理模型与数据驱动方法交叉融通的科学路径,重构污水处理智能控制系统的逻辑模式,以提升污... 详细信息

污水处理智能控制是水污染控制领域的前沿方向。人工智能技术的快速发展,为污水处理智能化控制系统研发注入了新的活力。当前亟须探索污水处理机理模型与数据驱动方法交叉融通的科学路径,重构污水处理智能控制系统的逻辑模式,以提升污水处理智能控制技术研发水平。为此,从污水处理过程的确定性-随机性特征出发,提出了融合机理模型与数据模型的双回路控制系统设想,未来通过充分的实践探索,有望为污水处理智能控制提供新的技术路线。首先,分析了污水处理智能控制系统的基本要素,分别探讨了基于确定性的机理模型及基于随机性的数据驱动模型对污水处理系统的控制作用,进而提出了机理模型与数据模型融合驱动的双回路控制系统基本逻辑架构及控制原理,并分析了该系统在污水处理复杂过程中应用的拓扑结构。最后,围绕未来污水处理智能控制技术发展作了展望。

关键词：污水处理确定性-随机性机理模型数据驱动模型智能控制

基于微生物库仑量抑制率的水体重金属污染监测方法

在线全文

学校读者我要写书评

暂无评论

环境工程学报 2022年第9期16卷 3041-3049页

作者：马野董海太王厦王宗萍殷逢俊中国科学院重庆绿色智能技术研究院重庆400714 中国科学院大学北京100049

为实现对水环境重金属污染的实时原位监测,利用单室微生物燃料电池(microbial fuel cell,MFC)传感器搭建了单程连续流装置,并对其预警稳定性进行了探讨。结果表明:以Cr(Ⅵ)作为目标污染物,MFC传感器的检出限为0.4 mg·L^(-1),在0.2~1 mg... 详细信息

为实现对水环境重金属污染的实时原位监测,利用单室微生物燃料电池(microbial fuel cell,MFC)传感器搭建了单程连续流装置,并对其预警稳定性进行了探讨。结果表明:以Cr(Ⅵ)作为目标污染物,MFC传感器的检出限为0.4 mg·L^(-1),在0.2~1 mg·L^(-1)的质量浓度区间内,库仑量抑制率与Cr(Ⅵ)质量浓度具有较高的共变趋势;设定模拟废水中Cr(Ⅵ)的质量浓度为1 mg·L^(-1),MFC传感器对乙酸钠质量浓度分别为384.62、480.77和576.92 mg·L^(-1)的模拟废水预警的库仑量抑制率为34.71%±1.65%、36.60%±3.82%和36.28%±10.64%;对分别含有谷氨酸、乳酸和蔗糖(质量浓度均为50 mg·L^(-1))的模拟废水预警的库仑量抑制率为35.22%±6.51%、37.05%±3.74%和24.23%±1.90%,这说明MFC传感器对水样中的可生化降解有机物具有一定的抗干扰能力;MFC传感器连续3次对含有1 mg·L^(-1)Cr(Ⅵ)模拟废水预警的库仑量抑制率为35.37%±3.21%、39.48%±0.95%和41.50%±4.24%,证明MFC传感器的预警信号重现性较好。以上研究结果可为MFC传感器实时原位监测水体重金属污染提供技术参考。

关键词：微生物燃料电池传感器重金属污染库仑量抑制率实时原位监测