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Development of piezoelectric energy-harvesting tuned mass damper

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Science China(Technological Sciences) 2017年第3期60卷 467-478页

作者： pan peng ZHANG DongBin NIE Xin CHEN HaoWen Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Tsinghua University Beijing 100084 China Department of Civil Engineering Tsinghua University Beijing 100084 China

Tuned mass dampers（TMDs）are one of the most widely used devices to mitigate vibrations in ***,in conventional TMDs,viscous dampers convert the energy of vibration into heat.A new type of TMDs,called regenerative TMD... 详细信息

关键词： piezoelectric tuned mass damper regenerative vibration control energy harvesting

Development and application of a neural network based coating weight control system for a hot-dip galvanizing line

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Frontiers of Information Technology & Electronic Engineering 2018年第7期19卷 834-846页

作者： Zai-sheng pan Xuan-hao ZHOU peng CHEN Institute of Cyber-Systems and Control Zhejiang University Zhejiang SUPCON Research Co. Ltd.

The hot-dip galvanizing line(HDGL) is a typical order-driven discrete-event process in steelmaking. It has some complicated dynamic characteristics such as a large time-varying delay, strong nonlinearity, and unmeasured disturbance, all of which lead to the difficulty of an online coating weight controller design. We propose a novel neural network based control system to solve these problems. The proposed method has been successfully applied to a real production line at Va Lin LY Steel Co., Loudi, China. The industrial application results show the effectiveness and efficiency of the proposed method, including significant reductions in the variance of the coating weight and the transition time.

关键词： Neural network Hot-dip galvanizing line (HDGL) Coating weight control

An unconventional phase field modeling of domains formation and evolution in tetragonal ferroelectrics

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Science China(Technological Sciences) 2016年第7期59卷 1059-1064页

作者： ZHOU YouGang peng JinLin pan Kai LIU YunYa Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education and Key Laboratory of Materials Design and Preparation Technology of Hunan Province School of Materials Science and Engineering Xiangtan University

Based on characteristic functions of variants, we developed an unconventional phase field modeling for investigating domains formation and evolution in tetragonal ferroelectrics. In order to develop this computational approach, we constructed the anisotropy energy of tetragonal variants, which is used instead of Landau-Devonshire potential in the conventional phase field method, resulting in that much fewer parameters are needed for simulations. This approach is advantageous in simulations of emerging ferroelectric materials. We employ it to study the formation and evolution of domains in tetragonal barium titanate single crystal, as well as the nonlinear behaviors under cyclical stress and electric field loading. A multi-rank laminated ferroelectric domain pattern, 90° domain switching accompanied by polarization rotation, and 180° domain switching accompanied by move of domain wall are predicted. It is found that the speed of 90° domain switching is slower than that of 180° domain switching, due to both polarization and transformation strain changed in 90° domain switching. It also suggests that large strain actuation can be generated in single crystal ferroelectrics via combined electromechanical loading inducing 90° domain switching. The good agreement between simulation results and experimental measurements is observed.

关键词： phase field simulation ferroelectric domains formation and evolution ferroelectric materials

Multivalent manganese oxides with high electrocatalytic activity for oxygen reduction reaction

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Frontiers of Chemical Science and Engineering 2018年第4期12卷 790-797页

作者： Xiangfeng peng Zhenhai Wang Zhao Wang Yunxiang pan School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300350China School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009China

A noble-metal-free catalyst based on both Mn3O4 and MnO was prepared by using the dielectric barrier discharge technique at moderate temperature. The prepared catalyst shows a higher electrocatalytic activity towards the oxygen reduction reaction than the catalyst prepared by using the traditional calcination process. The enhanced activity could be due to the coexistence of manganese ions with different valences, the higher oxygen adsorption capacity, and the suppressed aggregation of the catalyst nanoparticles at moderate temperature. The present work would open a new way to prepare low-cost and noble-metal-free catalysts at moderate temperature for more efficient electrocatalysis.

关键词： oxygen reduction reaction manganese oxides mixed valences of manganese oxygen adsorption dielectric barrier discharge

New three-dimensional guidance law for BTT missiles based on differential geometry and Lie-group

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Journal of Systems Engineering and Electronics 2011年第4期22卷 684-690页

作者： Shuangchun peng Liang pan Tianjiang Hu Lincheng Shen College of Mechatronic Engineering and Automation National University of Defense Technology Changsha 410073 P. R. China

A new non-decoupling three-dimensional guidance law is proposed for bank-to-turn （BTT） missiles with the motion coupling problem. In this method, the different geometry is taken for theoretically modeling on B-IT missiles＇ motion within the threedimensional style without information loss, and meanwhile, Liegroup is utilized to describe the line-of-sight （LOS） azimuth when the terminal angular constraints are considered. Under these cir- cumstances, a guidance kinematics model is established based on differential geometry. Then, corresponding to no terminal angular constraint and terminal angular constraints, guidance laws are re- spectively designed by using proportional control and generalized proportional-derivative （PD） control in SO（3） group. Eventually, simulation results validate that this developed method can effectively avoid the complexity of pure Lie-group method and the information loss of the traditional decoupling method as well.

关键词： three-dimensional guidance law differential geometry,Lie-group control bank-to-turn (BTT).

A review of Pt-based electrocatalysts for oxygen reduction reaction

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Frontiers in Energy 2017年第3期11卷 268-285页

作者： Changlin ZHANG Xiaochen SHEN Yanbo pan Zhenmeng peng Department of Chemical and Biomolecular Engineering University of Akron Akron OH 44325 USA

Development of active and durable electro- catalyst for oxygen reduction reaction （ORR） remains one challenge for the polymer electrolyte membrane fuel cell （PEMFC） technology. Pt-based nanomaterials show the greatest promise as electrocatalyst for this reaction among all current catalytic structures. This review focuses on Pt- based ORR catalyst material development and covers the past achievements, current research status and perspectives in this research field. In particular, several important categories of Pt-based catalytic structures and the research advances are summarized. Key factors affecting the catalyst activity and durability are discussed. An outlook of future research direction of ORR catalyst research is provided.

关键词： oxygen reduction reaction (ORR) electrocatalysis platinum catalyst activity durability

Novel stacking models based on SMOTE for the prediction of rockburst grades at four deep gold mines

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Underground Space 2024年第6期19卷 169-188页

作者： peng Xiao Zida Liu Guoyan Zhao pengzhi pan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Rockburst is a frequently encountered hazard during the production of deep gold *** prediction of rockburst is an important measure to prevent rockburst in gold *** study considers seven indicators to evaluate rockburst at four deep gold *** research and rock tests were performed at two gold mines in China to collect these seven indicators and rockburst *** collected database was oversampled by the synthetic minority oversampling technique(SMOTE)to balance the categories of rockburst *** models combining tree-based models and logistic regression(LR)were established by the balanced *** datasets from another two deep gold mines were implemented to verify the applicability of the predictive *** stacking model combining extremely randomized trees and LR based on SMOTE(SMOTE-ERT-LR)was the best model,and it obtained a training accuracy of 100%and an evaluation accuracy of 100%.Moreover,model evaluation suggested that SMOTE can enhance the prediction performance for weak rockburst,thereby improving the overall ***,sensitivity analysis was performed for *** results indicated that the SMOTE-ERT-LR model can achieve satisfactory performance when only depth,maximum tangential stress index,and linear elastic energy index were available.

关键词： Rockburst prediction Gold mine Stacking model SMOTE

The Possibility and Molecular Mechanisms of Cell Pyroptosis After Cerebral Ischemia

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Neuroscience Bulletin 2018年第6期34卷 1131-1136页

作者： Zhaofei Dong Kuang pan Jingrui pan Qingxia peng Yidong Wang Department of Neurology Sun Yat-sen Memorial HospitalSun Yat-sen University Guangdong Province Key Laboratory of Brain Function and Disease Zhongshan School of Medicine Sun Yat-sen University Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Sun Yat-sen Memorial Hospital Sun Yat-sen University

Introduction Stroke is an important disease that is prevalent worldwide[1–3]. Ischemic stroke accounts for 80%of stroke ***, evidence-based effective treatments for ischemic stroke are limited, and only intravenous t... 详细信息

关键词： The Possibility and Molecular Mechanisms of Cell Pyroptosis After Cerebral Ischemia ASC

Drainage-induced ground response in a twin-tunnel system through analytical prediction over the seepage field

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Underground Space 2022年第3期7卷 408-418页

作者： Cheng-wei Zhu wei Wu Hong-wei Ying Xiao-nan Gong pan-pan Guo Research Center of Coastal and Urban Geotechnical Engineering HangzhouChina Institut fur Geotechnik Universitat fur BodenkulturFeistmantelstrasse 4A-1180 ViennaAustria Institute of Geotechinical Engineering Hohai UniversityNanjingChina

Leakage-induced hydraulic and ground responses in a twin-tunnel system are analyzed via the proposed analytical solution on the seepage *** seepage continuity conditions are rigorously satisfied at the interface between the ground and the tunnel lining,in terms of both water pressure and seepage *** analytical solution is verified by comparing the results of numerical simulations.A detailed parametric analysis is carried out to explore the effect of tunnels’spatial layouts and degraded waterproof facilities on leakageinduced hydraulic and ground response,including head decline,water inflow and ground surface *** results show that the often used single tunnel model tends to overestimate the pore pressure on the lining along with water inflow into the tunnel,and underestimate the leakage-induced ground settlement.

关键词： Twin tunnel Leakage Head decline Water inflow Ground settlement