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Simultaneous acceleration of sulfur reduction and oxidation on bifunctional electrocatalytic electrodes for quasi-solid-state Zn–S batteries

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Science China Chemistry 2024年第5期67卷 1531-1538页

作者： Mingli Wang Hong Zhang Tianhang Ding Fangjun Wu Lin Fu Bin Song pengfei cao Ke Lu Institutes of Physical Science and Information Technology School of Materials Science and EngineeringKey Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationAnhui UniversityHefei 230601China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China State Key Lab of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The incomplete sulfur reduction and high ZnS re-oxidation energy barrier along with severe side reactions during the battery cycling compromise the practical application of Zn–S electrochemistry. Herein, a bifunctional electrocatalytic sulfur matrix that simultaneously accelerates the sulfur reduction and ZnS oxidation is proposed to realize a highly-efficient Zn–S cell. It is revealed that the N-heteroatom hotspots are more favorable for facilitating the conversion of S to ZnS while the CoO nanocrystal substantially lowers the ZnS activation energy barrier thereby suppressing the formation of disproportionation species(e.g.,SO_(4)^(2-)) and accumulation of inactive ZnS. Accordingly, the Co O anchored on the N-doped carbon-supported sulfur cathode delivers a high Zn^(2+)storage capacity of 1,172 m Ahg^(-1)and outstanding cycling stability with a capacity retention of 71.6% after500 cycles with a high average Coulombic efficiency of 97.8%. Simultaneously, the stable cycling of solid-state Zn–S pouch cells with an energy density of 585 Whkg^(-1)sulfuris also demonstrated. Moreover, the postmortem analysis reveals that the degradation of Zn–S cells is mainly attributed to the limited reversibility of Zn anodes rather than the ZnS decomposition and/or accumulation. The approach to the bidirectional catalysis manipulated the sulfur redox provides a new perspective to realize the theoretical potentials of Zn–S cells.

关键词： Zn–S battery bifunctional catalysts solid-state battery sulfur redox degradation mechanism

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早期整形修复对烧伤患者治疗有效性的研究

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中国伤残医学 2024年第11期32卷 38-40页

作者：曹鹏飞江门市中心医院广东江门529030

目的:探讨早期整形修复治疗在烧伤患者中的应用效果.方法:选取2015年1月—2020年10月我院收治的50例烧伤患者作为研究对象,按照随机数字表法分为对照组和观察组,各25例.对照组烧伤10 d后进行治疗,观察组烧伤10 d内进行治疗,比较分析2组... 详细信息

目的:探讨早期整形修复治疗在烧伤患者中的应用效果.方法:选取2015年1月—2020年10月我院收治的50例烧伤患者作为研究对象,按照随机数字表法分为对照组和观察组,各25例.对照组烧伤10 d后进行治疗,观察组烧伤10 d内进行治疗,比较分析2组治疗总有效率、皮片成活率、外观平整度、二次手术率、并发症发生情况及生活质量评分.结果:观察组二次手术率、并发症发生率均低于对照组,治疗总有效率、皮片成活率、外观平整度及生活质量评分均高于对照组,组间差异有统计学意义(P<0.05).结论:早期整形修复治疗在烧伤患者中具有较好的应用效果,可有效提高治疗有效率与皮片成活率,恢复外观平整,降低二次手术与相关并发症的发生,提高患者的生活质量.

关键词：烧伤整形早期整形修复有效性并发症生活质量

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Feasibility analysis and online adjustment of constraints in model predictive control integrated with soft sensor

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1230-1237页

作者： pengfei cao Xionglin Luo Xiaohong Song College of Electrical Engineering and Automation Shandong University of Science and Technology Research Institute of Automation China University of Petroleum State Grid Shandong Electric Power Company Zibo Power Supply Company

Feasibility analysis of soft constraints for input and output variables is critical for model predictive control(MPC).When encountering the infeasible situation, some way should be found to adjust the constraints to guarantee that the optimal control law exists. For MPC integrated with soft sensor, considering the soft constraints for critical variables additionally makes it more complicated and difficult for feasibility analysis and constraint adjustment. Therefore, the main contributions are that a linear programming approach is proposed for feasibility analysis, and the corresponding constraint adjustment method and procedure are given as well. The feasibility analysis gives considerations to the manipulated, secondary and critical variables, and the increment of manipulated variables as well. The feasibility analysis and the constraint adjustment are conducted in the entire control process and guarantee the existence of optimal control. In final, a simulation case confirms the contributions in this paper.

关键词： Soft sensor Model predictive control Variable constraints Feasibility analysis

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Dynamic interaction analysis and pairing evaluation in control configuration design

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Chinese Journal of Chemical Engineering 2016年第7期24卷 861-868页

作者： Xionglin Luo pengfei cao Feng Xu Department of Automation China University of PetroleumBeijing

This paper presents some new dynamic interaction analysis approaches for square or non-square systems and a pairing evaluation method. For square stable systems, an open-loop approach is proposed, which features the tradeoff between the contributions of response time constant and delay time to relative gain. For non-square stable systems, an extension from the proposed open-loop approach for square systems is presented and the corresponding pairing procedure is given. No interaction analysis approach is perfect for all systems, so any recommended pairing needs to be examined. An evaluation method is proposed in closed-loop with optimal controllers for each loop and whether the pairing is appropriate can be evaluated through testing if the equivalent relative gain is within defined scope. The advantages and effectiveness of proposed interaction analysis approaches and pairing evaluation method are highlighted via several examples of industrial processes.

关键词： Control configurationInteractionPairing evaluationNon-square systemsPID

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Modeling and identification for soft sensor systems based on the separation of multi-dynamic and static characteristics

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Chinese Journal of Chemical Engineering 2018年第1期26卷 137-143页

作者： pengfei cao Xionglin Luo Xiaohong Song College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China Research Institute of Automation China University of PetroleumBeijing 102249China State Grid Shandong Electric Power Company Zibo Power Supply Company Zibo 255000China

Data-driven soft sensor is an effective solution to provide rapid and reliable estimations for key quality variables online. The secondary variables affect the primary variable in considerably different speed, and soft sensor systems exhibit multi-dynamic characteristics. Thus, the first contribution is improving the model in the previous study with multi-time-constant. The characteristics-separation-based model will be identified in substep way,and the stochastic Newton recursive(SNR) algorithm is adopted. Considering the dual-rate characteristics of soft sensor systems, the proposed model cannot be identified directly. Thus, two auxiliary models are first proposed to offer the intersample estimations at each update period, based on which the improved algorithm(DAM-SNR) is derived. These two auxiliary models function in switching mechanism which has been illustrated in detail. This algorithm serves for the identification of the proposed model together with the SNR algorithm, and the identification procedure is then presented. Finally, the laboratorial case confirms the effectiveness of the proposed soft sensor model and the algorithms.

关键词： soft sensor Modeling Characteristics separation System identification Double auxiliary models

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Study on Wave Added Resistance of Ships in Oblique Waves Based on Panel Method

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Journal of Ocean University of China 2022年第3期21卷 773-781页

作者： WANG Xujie ZHANG Ri ZHAO Jing cao pengfei College of Engineering Ocean University of ChinaQingdao266100China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao266100China Shipping Center Ocean University of ChinaQingdao266100China

When the ship is sailing at sea,wave added resistance has great influence on the rapidity and economy of the *** the increasing pressure of energy and environmental protection,IMO has proposed the EEDI formula of the newly built ships,which restricts the energy consumption standard of civil ships more ***,a panel method based on three dimensional potential flow theory is proposed to study the problem of wave added resistance in this ***,the method solves the motion responses of the ship in the time domain,and then calculates the wave added resistance of the ship by near-field pressure integration *** wave added resistance of S175 container ship in head and oblique waves are calculated and compared with the experimental data,and the accuracy of the proposed method are *** last,the influence of Froude number and wave direction angle on wave added resistance is *** proposed method provides an approach of satisfactory accuracy and efficiency for the development of high-performance new ship forms,optimization of ship hull lines,comprehensive performance evaluation of ships and practical navigation guidance.

关键词： wave added resistance oblique wave panel method potential flow theory

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带式焙烧机工艺高硅镁质熔剂性球团制备特性

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烧结球团 2024年第2期49卷 38-46页

作者：曹鹏飞张倩潘建杨聪聪徐梦杰中钢设备有限公司北京100080 中南大学资源加工与生物工程学院湖南长沙410083 中南大学低碳与氢冶金研究中心湖南长沙410083

本文以高品位磁铁精矿(O矿)、高镁磁铁精矿(K矿)和高硅赤铁矿粉(Y矿)为原料,根据某钢厂现场原料配比40%O矿+20%K矿+40%Y矿,在实验室开展模拟带式焙烧机工艺的高硅镁质熔剂性球团制备特性研究,揭示了二元碱度(cao/SiO 2为0.5~0.9)对球团... 详细信息

本文以高品位磁铁精矿(O矿)、高镁磁铁精矿(K矿)和高硅赤铁矿粉(Y矿)为原料,根据某钢厂现场原料配比40%O矿+20%K矿+40%Y矿,在实验室开展模拟带式焙烧机工艺的高硅镁质熔剂性球团制备特性研究,揭示了二元碱度(cao/SiO 2为0.5~0.9)对球团焙烧特性、成品球团冶金性能(还原度RI、还原膨胀指数RSI和动态法低温还原粉化指数LTD+3.15 mm)和矿相学特征的影响规律。结果表明:提高球团碱度有利于改善球团焙烧和冶金性能,在0.5~0.9的碱度范围内,球团的还原度≥65.38%、还原膨胀指数15%、动态低温还原粉化性能优良(≥98.88%)。矿相分析结果表明,所制备高硅镁质熔剂性球团的固结形式主要为Fe 2O 3再结晶,提高碱度利于形成更多液相从而促进固结,降低球团孔隙率,从而生产出性能良好的成品球团。本研究将为工业生产实践提供有力支撑和重要借鉴。

关键词：带式焙烧机工艺碱度高硅镁质熔剂性球团冶金性能矿相

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基于微服务架构的微电网运行自动加密仿真研究

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电气自动化 2024年第4期46卷 60-62页

作者：曹鹏飞孙贺凯刘闯北京国网信通埃森哲信息技术有限公司北京100053

为保障微电网运行数据安全,研究了基于微服务架构的微电网运行自动加密方法。构建基于微服务架构的微电网运行加密结构;采集微电网设备运行数据;利用负载均衡模块实现负载均衡分配;采用基于高级加密标准算法与非对称加密算法的混合加密... 详细信息

为保障微电网运行数据安全,研究了基于微服务架构的微电网运行自动加密方法。构建基于微服务架构的微电网运行加密结构;采集微电网设备运行数据;利用负载均衡模块实现负载均衡分配;采用基于高级加密标准算法与非对称加密算法的混合加密机制实现微电网运行数据加密。经仿真试验验证:该方法可有效完成数据加密处理,可有效提升微电网运行数据安全性,保障负载均衡。

关键词：微服务架构微电网运行自动加密数据来源层微服务层数据安全性

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基于HGS-ANN混合模型的爆破振动预测

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矿冶工程 2024年第4期44卷 159-163页

作者：王鑫瑀曹鹏飞肖一清徐国权河北钢铁集团矿业有限公司河北唐山063000 东华理工大学地球科学学院江西南昌330000

将饥饿游戏搜索算法(HGS)与神经网络算法(ANN)相结合,开发了一种新的混合模型HGS-ANN,用来预测爆破振动。分别基于数据分组处理方法(GMDH)、支持向量机(SVM)、神经网络算法(ANN)以及萨道夫斯基经验公式建立了4种不同预测模型,并与HGS-AN... 详细信息

将饥饿游戏搜索算法(HGS)与神经网络算法(ANN)相结合,开发了一种新的混合模型HGS-ANN,用来预测爆破振动。分别基于数据分组处理方法(GMDH)、支持向量机(SVM)、神经网络算法(ANN)以及萨道夫斯基经验公式建立了4种不同预测模型,并与HGS-ANN模型进行对比,评估模型性能。从某露天矿山收集了32组爆破数据,选择爆心距、最大单段药量、总药量、抵抗线、孔距、孔数、孔深等7个自变量作为输入参数,选择质点振动速度作为输出参数,以均方根误差(RMSE)和决定性系数(R^(2))作为模型性能评价指标,对所建立的模型性能进行对比。结果表明,HGS-ANN模型的RMSE和R^(2)分别为0.833和0.963,性能优于其他4种模型。HGS-ANN模型可以作为一个辅助工具来优化爆破设计,降低爆破地震效应。

关键词：爆破振动饥饿游戏搜索算法神经网络振动预测

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Study on Wave Added Resistance of a Deep-V Hybrid Monohull Based on Panel Method

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Journal of Ocean University of China 2020年第3期19卷 601-608页

作者： WANG Xujie ZHAO Jing ZHANG Huidong cao pengfei LIU Peng College of Engineering Ocean University of ChinaQingdao 266100China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266100China Shipping Center Ocean University of ChinaQingdao 266100China

In this paper, a panel method based on three dimensional potential flow theory is used to study the problem of wave added resistance. The time-domain motion response of Wigely III ship in head waves is calculated by AQWA, and then the wave added resistance of ship is obtained by near-field pressure integration method. By comparing the calculated results with the experimental data in literature, it is shown that the variation trend and peak value are in good agreement, and the accuracy and efficiency meet the research requirements. Based on the above mentioned method, the wave added resistance of a deep-V hybrid monohull in head waves is studied. The motions and wave added resistances of the deep-V hybrid monohull and the deep-V original ship advancing in head waves with various forward speed and wave frequencies are calculated and analyzed. The results show that the longitudinal motion response of the deep-V hybrid monohull is effectively suppressed and the wave added resistance is obviously reduced, the new type of ship has good engineering application prospects. The present method provides an approach of satisfactory accuracy and efficiency to predict wave added resistance of ships voyaging in waves.

关键词： wave added resistance panel method hybrid monohull time-domain motion response near-field method

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