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Strongly Coupled Ag/Sn-SnO_(2)Nanosheets Toward CO_(2)Electroreduction to Pure HCOOH Solutions at Ampere‑Level Current

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Nano-Micro Letters 2024年第3期16卷 212-226页

作者： Min Zhang Aihui Cao Yucui Xiang Chaogang Ban Guang Han Junjie Ding Li‑Yong Gan Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002People’s Republic of China College of Materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Institute of New Energy Storage Materials and Equipment Chongqing 401135People’s Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044People’s Republic of China

Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance ***,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO_(2) grains,designated as Ag/Sn-SnO_(2) nanosheets(NSs),which possess optimized electronic structure,high electrical conductivity,and more accessible *** a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term stability(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to ***,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO_(2)NSs not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/Sn-SnO_(2)NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 M pure HCOOH solution at 100 mA cm^(−2)over 200 *** work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO_(2).

关键词： Electrochemical CO_(2)reduction Coupled Ag/Sn-SnO_(2)nanosheets Electronic structure Porous solid electrolyte Pure

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Fast and reliable reduced-order models for cardiac electrophysiology

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GAMM Mitteilungen 2023年第3-4期46卷 e202370014-e202370014页

作者： Chellappa, Sridhar Cansız, Barış Feng, Lihong Benner, Peter Kaliske, Michael Computational Methods in Systems and Control Theory Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg Germany Institute for Structural Analysis Technische Universität Dresden Dresden Germany

Mathematical models of the human heart increasingly play a vital role in understanding the working mechanisms of the heart, both under healthy functioning and during disease. The ultimate aim is to aid medical practitioners diagnose and treat the many ailments affecting the heart. Towards this, modeling cardiac electrophysiology is crucial as the heart's electrical activity underlies the contraction mechanism and the resulting pumping action. Apart from modeling attempts, the pursuit of efficient, reliable, and fast solution algorithms has been of great importance in this context. The governing equations and the constitutive laws describing the electrical activity in the heart are coupled, nonlinear, and involve a fast moving wave front, which is generally solved by the finite element method. The numerical treatment of this complex system as part of a virtual heart model is challenging due to the necessity of fine spatial and temporal resolution of the domain. Therefore, efficient surrogate models are needed to predict the electrical activity in the heart under varying parameters and inputs much faster than the finely resolved models. In this work, we develop an adaptive, projection-based reduced-order surrogate model for cardiac electrophysiology. We introduce an a posteriori error estimator that can accurately and efficiently quantify the accuracy of the surrogate model. Using the error estimator, we systematically update our surrogate model through a greedy search of the parameter space. Furthermore, using the error estimator, the parameter search space is dynamically updated such that the most relevant samples get chosen at every iteration. The proposed adaptive surrogate model is tested on three benchmark models to illustrate its efficiency, accuracy, and ability of generalization. © 2024 The Authors. GAMM - Mitteilungen published by Wiley-VCH GmbH.

关键词： Heart

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3D NUMERICAL INVESTIGATION OF AN EXTENDED KDAMPER ABSORBER FOR SEISMIC RETROFITTING OF LOW-RISE BUILDINGS 9

3D NUMERICAL INVESTIGATION OF AN EXTENDED KDAMPER ABSORBER F...

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9th ECCOMAS Thematic Conference on Computational Methods in structural dynamics and Earthquake Engineering, COMPDYN 2023

作者： Mantakas, A. Kapasakalis, K. Kalderon, M. Antoniou, M. Antoniadis, I.A. Sapountzakis, E. National Technical University of Athens School of Civil Engineering Department of Structural Engineering Institute of Structural Analysis and Antiseismic Research Heroon Polytechniou 9 Zografou Athens15780 Greece National Technical University of Athens School of Mechanical Engineering Department of Mechanical Design and Automatic Control Dynamics and Acoustics Laboratory Heroon Polytechniou 9 Zografou Athens15780 Greece ETH Zurich Department of Civil Environmental and Geomatic Engineering Stefano-Franscini-Platz 5 Zurich8093 Switzerland

Research in the field of seismic protection has progressed significantly, starting from the use of simple elastomeric bearings that require a reduction of the system's fundamental frequency to control the dynamic response of the superstructure, to more advanced vibration control devices that incorporate the use of additional oscillating masses and negative stiffness elements. Examples of these devices are the Tuned Mass Damper (TMD), the Quasi-Zero oscillators (QZSs) as well as the KDamper concept that is based essentially on a combination of appropriate stiffness, damping and mass elements, including a negative stiffness element. In this study, a passive KDamper-based vibration absorber is implemented at the base level of a typical existing building, between the foundation and the superstructure, as a means of seismic retrofitting. A mathematical model is formulated, and an optimization procedure is undertaken using both EC8 compatible artificial accelerograms as well as real earthquake records. Geometrical and manufacturing limitations are accounted for, regarding the realization of the negative stiffness mechanics and the rest vibration control components. A sophisticated 3D finite element model is subsequently generated aiming to take into account soil-structure interaction, material non-linearities and effect of geometry and location of the device in a realistic manner. Results indicate the beneficial effect of the system in the dynamic behavior of the structure and highlight the applicability of the system as well as limitations that should be considered in future research. © 2023 COMPDYN Proceedings. All rights reserved

关键词： Damping

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EXPERIMENTAL STUDY OF PHONONIC STRUCTURES WITH DDA ENHANCED UNIT-CELLS 9

EXPERIMENTAL STUDY OF PHONONIC STRUCTURES WITH DDA ENHANCED ...

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9th ECCOMAS Thematic Conference on Computational Methods in structural dynamics and Earthquake Engineering, COMPDYN 2023

作者： Kalderon, M. Mantakas, A. Chondrogiannis, K.A. Antoniadis, I.A. National Technical University of Athens School of Mechanical Engineering Department of Mechanical Design and Automatic Control Dynamics and Acoustics Laboratory Heroon Polytechniou 9 Zografou Athens15780 Greece National Technical University of Athens School of Civil Engineering Department of Structural Engineering Institute of Structural Analysis and Antiseismic Research Heroon Polytechniou 9 Zografou Athens15780 Greece ETH Zurich Department of Civil Environmental and Geomatic Engineering Stefano-Franscini-Platz 5 Zurich8093 Switzerland

Phononic structures with periodic unit-cells that exhibit Bragg scattering, have been investigated during the latest years by various researchers due to their extraordinary wave manipulation and filtering properties. One major feature of these metamaterials is their ability to generate stopbands or bandgaps in the frequency domain, hence presenting significant vibration attenuation properties. However, this mechanism presents certain design constraints in generating broadband bandgaps, especially in the low-frequency range, where large masses are required. To this end, a novel dynamic directional amplifier, namely the DDA, is introduced as a means to artificially increase the inertia of an oscillating mass. The DDA is realized by imposing kinematic constraints to the degrees of freedom (DoFs) of the oscillator, hence inertia is increased by coupling the horizontal and vertical motion. In this study, the DDA is implemented in an experimental scaled phononic set-up that is constructed using LEGO® Technic components. Experimental testing is undertaken as a feasibility assessment of the concept and results indicate the low-frequency wave attenuation properties of the structure. © 2023 COMPDYN Proceedings. All rights reserved

关键词： Metamaterials

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Layered metastructure containing freely-designed local resonators for wave attenuation

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Defence Technology（防务技术） 2024年第2期32卷 23-31页

作者： Yu Li Huguang He Jiang Feng Hailong Chen Fengnian Jin Hualin Fan State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Rocket Force University of Engineering Xi'an 710025China Henan International Joint Laboratory of Dynamics of Impact and Disaster of Engineering Structures Department of Civil EngineeringNanyang Institute of TechnologyNanyang 473004China Guangxi Key Laboratory of Disaster Prevention and Engineering Safety and Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China Research Center of Lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China

Combining periodic layered structure with three-dimensional cylindrical local resonators,a hybrid metastructure with improved wave isolation ability was designed and investigated through theoretical and numerical *** metastructure is composed of periodic rubber layers and concrete layers embedded with three-dimensional resonators,which can be freely designed with multi local resonant frequencies to attenuate vibrations at required frequencies and widen the attenuation *** metastructure can also effectively attenuate seismic *** with layered rubber-based structures,the metastructure has more excellent wave attenuation effects with greater attenuation and wider bandgap.

关键词： Layered metastructure Local resonator Wave attenuation

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Derailment probability of whole railway lines during an earthquake, considering the structure types of bridge, embankment and tunnel

Derailment probability of whole railway lines during an eart...

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IABSE Congress Christchurch 2020: Resilient Technologies for Sustainable Infrastructure

作者： Narita, Kenji Tokunaga, Munemasa Goto, Keiichi Sakai, Kimitoshi Structural Mechanics Laboratory Railway Technical Research Institute Japan Structural Dynamics and Response Control Laboratory Railway Technical Research Institute Japan

ISBN: (纸本)9783857481703

The derailment probability of trains on embankments and in tunnels is important for the evaluation of derailment fragility throughout the whole railway line during earthquakes. This study aimed to predict the number of trains expected to derail on a whole line during an earthquake. Nonlinear vehicle-structure interaction analyses revealed that the probability of derailment exceeded 50% when the ground acceleration was approximately 370 Gal on bridges, 900 Gal on embankments, and 1200 Gal in tunnels. The expected number of derailments was approximately 1-8 trains in the case of L2 spectrum I, considering the probability of derailment occurrence for each structure type. © 2020 IABSE Congress, Christchurch 2020: Resilient Technologies for Sustainable Infrastructure - Proceedings. All rights reserved.

关键词： Numerical methods

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Influence of Water Content and Lateral Pressure on Coal-Rock Wellbore Stability Under Biaxial Compression

SSRN

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SSRN 2024年

作者： Liu, Xudong Liu, Wei Wei, Yuanlong Zhang, Xiong Zhao, Fuping Zhao, Lingyun Fu, Yinlan Jiang, Deyi Li, Jianghao Li, Depeng State Key Laboratory of Coal Mine Disasters Dynamics and Control Chongqing University Chongqing400044 China Guizhou Oil and Gas Exploration and Development Engineering Research Institute Guiyang550081 China Key Laboratory of Unconventional Gas Evaluation and Development in Complex Structural Areas Guiyang550081 China

It is of great significance to analyze the failure form and crack expansion patterns around the coal-rock cavity for exploring the mechanism of wellbore instability in barefoot interval of multi-branch horizontal well. In order to better study the effects of water content and lateral pressure on the wellbore stability of barefoot interval of multi-branch horizontal wells, based on acoustic emission (AE) and digital image correlation (DIC) technologies, a series of biaxial compression tests of coal-rock with hole under different water content and lateral pressure were carried out for in Bijie experimental region of Guizhou Province. Furthermore, the failure modes and crack expansion patterns around coal-rock wellbore with different water content and lateral pressure were compared and analyzed. The results show that: (1) Water has a certain influence on the mechanical properties of coal-rock in the Bijie Experimental Region. The peak strength and peak strain both decrease with the increase of water content, and the elastic modulus is relatively little affected by water content. (2) The failure characteristics of coal-rock with different water content under biaxial compression test presents the composite failure modes of tension-shear, and is dominated by tensile failure. (3) The peak strength and peak strain of coal-rock increase in a power function form with the increase of (Symbol Presented)2, and the elastic modulus also increases slightly with the increase of (Symbol Presented)2. (4) Under different (Symbol Presented)2 conditions, the initial failure of coal samples mostly starts from the coal-rock wellbore and the vicinity of primary fractures. As the biaxial stress difference decreases, the self-stabilization time of coal samples increases. (5) The selection of wells ((Symbol Presented)1-(Symbol Presented)2) and the selection of wells with small Cov can effectively increase the stability performance of barefoot interval of coal reservoirs and reduce the risk of

关键词： Ductile fracture

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Aerothermoelastic study of a cantilever wing with structural uncertainties

Aerothermoelastic study of a cantilever wing with structural...

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第八届国际振动工程会议

作者： Zijie Ren Jian Liang Shun He Yingsong Gu Institute of Structural Dynamics and Control Northwestern Polytechnical University School of Aerospace Science Technology Xidian University

This paper presents a systematic study on influence of structural uncertainties on the flutter characteristics of a cantilever wing under thermal load. The prescribed temperature field personic condition was applied to the cantilever wing to analyze the flutter characteristics by using the finite element method. The results were compared with that at normal temperature *** results show that the flutter speed of the wing drops as the temperature increases. structural uncertainty is then considered in the simulation, and the uncertain structure parameters are taken as the design variables in searching for the minimum flutter speed. The results of uncertain flutter characteristics analysis is compared and verified by parametric study. The quantification of the uncertain parameters in the modeling and simulation is discussed. It is demonstrated that considering the model parameter uncertainty in aerothermalelastic problem is of practical value.

关键词： Aerothermoelastic study of a cantilever wing with structural uncertainties

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Aerothermoelastic study of a cantilever plate with structural uncertainties

Aerothermoelastic study of a cantilever plate with structura...

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第八届国际振动工程会议

作者： Zijie Ren Jian Liang Shun He Yingsong Gu Institute of Structural Dynamics and Control Northwestern Polytechnical University School of Aerospace Science Technology Xidian University

This paper presents a systematic study on influence of structural uncertainties on the flutter characteristics of a cantilever plate under hypersonic aerodynamic heating condition. Based on Newton's theory and isentropic equation, the temperature field of a given hypersonic condition was derived and applied to the cantilever plate to analyze the flutter characteristics by using the finite element method. The results were compared with that at normal temperature condition. The results show that the flutter speed of the plate drops as the temperature increases. structural uncertainty is then considered in the simulation, and the uncertain structure parameters are taken as the design variables in searching for the minimum flutter speed. The results of uncertain flutter characteristics analysis is compared and verified by parametric study. The quantification of the uncertain parameters in the modeling and simulation is discussed. It is demonstrated that considering the model parameter uncertainty in hypersonic flutter problem is of practical value.

关键词： Aerothermoelastic study of a cantilever plate with structural uncertainties

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A lightweight convolutional neural network-based model and system for defect detection and navigation on bridge road surface

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Advances in Engineering Software 2025年 208卷

作者： Fu, Ronghua Zhang, Yufeng Novák, Drahomír Strauss, Alfred Cao, Maosen College of Mechanics and Materials Hohai University Nanjing China State Key Laboratory of Safety Durability and Healthy Operation of Long Span Bridges 2200 Chengxin Avenue Jiangning District Nanjing China Jiangsu Transportation Institute Group Co. Ltd. 2200 Chengxin Avenue Jiangning District Nanjing China Institute of Structural Mechanics Faculty of Civil Engineering Brno University of Technology Brno Czech Republic Department of Civil Engineering and Natural Hazards University of Natural Resources and Life Sciences Vienna1180 Austria Institute of Structural Dynamics and Control Hohai University Nanjing China

The Faster Region-based Convolutional Neural Network (Faster R-CNN) is widely used for detecting defects on road surface. However, its effectiveness in this task is limited by its large model size and slow detection speed. To address these challenges, two versions of the Faster R-CNN model—small and large—were developed. First, the models were structurally optimized by integrating inverted residual blocks, depthwise separable convolutions, and attention mechanisms to improve efficiency and performance. The large version also incorporated multi-scale feature extraction for enhanced detection capabilities. Second, model pruning was applied to further compress the networks. Extensive ablation experiments were conducted to investigate the relationship between the model's internal structure and its impact on crack detection accuracy and efficiency. The experimental results demonstrate that the proposed models outperform general CNN-based models in bridge surface defect detection, achieving superior detection speed while maintaining high accuracy. The large version exhibits better performance but at the cost of increased model complexity. Testing was conducted on a real-life bridge in Nanjing, China. Additionally, a software application, integrated with a laptop and a smartphone, was deployed to identify defects and map their locations on the bridge, streamlining the detection process. The source code of this software is freely available at https://***/DUYA686686/*** © 2025

关键词： Convolutional neural networks

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