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Rapid Fabrication of Electrodes for Symmetrical Solid Oxide Cells by Extreme Heat Treatment

Energy & Environmental Materials 2024年第5期7卷 349-356页

作者： Weiwei Fan Zhu Sun Manxi Wang Manxian Li Yuming Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA School of Materials Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Zhangjiang Institute for Advanced Study(ZIAS) Shanghai Jiao Tong UniversityShanghai 201210China College of Environmental Science and Engineering and College of Physics and Energy Fujian Normal UniversityFuzhou 350000China

Symmetrical solid oxide cells(SSOCs)are very useful for energy generation and *** fabricate the electrode of SSOC,it is very time-consuming to use the conventional *** this work,we design and develop a novel method,extreme heat treatment(EHT),to rapidly fabricate electrodes for *** show that by using the EHT method,the electrode can be fabricated in seconds(the fastest method to date),benefiting from enhanced reaction *** EHT-fabricated electrode presents a porous structure and good adhesion with the *** contrast,tens of hours are needed to prepare the electrode by the conventional approach,and the prepared electrode exhibits a dense structure with a larger particle size due to the lengthy *** EHT-fabricated electrode shows desirable electrochemical ***,we show that the electrocatalytic activity of the perovskite electrode can be tuned by the vigorous approach of fast exsolution,deriving from the increased active sites for enhancing the electrochemical *** 900℃,a promising peak power density of 966 mW cm^(-2)is *** work exploits a new territory to fabricate and develop advanced electrodes for SSOCs in a rapid and high-throughput manner.

关键词： electrochemical performance extreme heat treatment perovskite electrode symmetrical solid oxide cells

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Geometrical nonlinear Hall effect induced by Lorentz force

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Physical Review B 2024年第11期110卷 115123页

作者： Junjie Yao Yizhou Liu Wenhui Duan State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics School of Physics Science and Engineering Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology Beijing 100084 China Institute for Advanced Study

The recently discovered nonlinear Hall (NLH) effect arises either without external magnetic field (type-I) or with an in-plane magnetic field (type-II). In this work we propose a new type of geometrical nonlinear Hall effect with an out-of-plane magnetic field (type-III) induced by the combination of Lorentz force and anomalous electronic velocity. The type-III NLH effect is proportional to the more refined structures of Bloch wave functions, i.e., the dipole moment of square of Berry curvature, thus becoming prominent near the band crossings or anticrossings. Our effective model analysis and first-principles calculations show that gate-tuned MnBi2Te4 thin film under uniaxial strain is an ideal platform to observe this effect. Especially, giant unidirectional magnetoresistance can occur in this material, based on which an efficient electrical transistor device prototype can be built. Finally, a symmetry analysis indicates that type-III NLH effect has unique symmetry properties stemming from Berry curvature square dipole, which is different from other previously reported NLH effects and can exist in a wider class of magnetic crystals. Our study offers paradigms for nonlinear electronics.

关键词： Electrical conductivity Hall effect Quantum transport Topological materials First-principles calculations

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Distributed No-Regret Learning for Stochastic Aggregative Games over Networks

Distributed No-Regret Learning for Stochastic Aggregative Ga...

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第41届中国控制会议

作者： Jinlong Lei Peng Yi Li Li Department of Control Science and Engineering Tongji University Institute for Advanced Study Tongji University Shanghai Research Institute for Intelligent Autonomous Systems

In this work,we propose a distributed no-regret learning for stochastic aggregative games over time-varying *** consider a finite set of players repeatedly playing the network aggregative game in stochastic regimes,where each player has an expectation-valued objective function depending on its own strategy and the aggregate of all player strategies,and the players can estimate gradients of their objective functions up to a zero-mean error with bounded *** consider the scenario in which players cannot directly obtain the aggregate value,but they are able to share their estimates of the aggregate with their neighbors without disclosing their own *** design a distributed learning algorithm based on the mirror descent and dynamical averaging *** then provide analysis for both the variational regret and the cost regret for aggregative games with player-specific problem being convex,and show that the expected regret bounds can be O(K) for specific *** analyses indicate the key correlations between the regret bounds,the network connectivity,and game structures,*** addition,we validate the almost sure convergence to the Nash equilibrium for the class of strictly monotone ***,we present preliminary numerics by applying the proposed scheme to the Nash-Cournot competition problem.

关键词： Distributed No-Regret Learning for Stochastic Aggregative Games over Networks

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Frequency Domain Separation of DAS Multi-Source Aliased Signals

Frequency Domain Separation of DAS Multi-Source Aliased Sign...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Gu, Huaxin Liu, Shuaiqi Yu, Feihong Xu, Deyu Chen, Xingwei Shao, Liyang Wu, Yu Zhang, Haifeng College of Innovation and Entrepreneurship Southern University of Science and Technology Shenzhen China Southern University of Science and Technology Department of Electrical and Electronic Engineering Shenzhen China School of Information and Communication Engineering University of Electronic Science and Technology Chengdu China Research Institute of Tsinghua University Advanced Measurement and Control and Equipment R&d Center Chengdu China

ISBN: (纸本)9798350312614

In this paper, fast independent vector analysis (FastIVA) based on convolutional aliasing model is proposed to separate the aliased signals collected by distributed acoustic sensing (DAS) system, and the time-frequency entropy is used to judge the separation performance. The results show that the time-frequency entropy interval of the separated signals and the source signals correspond to each other, which means that the aliased signals are separated. This method is used to improve the accuracy of DAS system signal detection and recognition in complex real environment, and reduce the number of false alarm events. © 2023 IEEE.

关键词： convolutional aliasing model DAS FastIVA time-frequency entropy

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In-situ forming ultra-mechanically sensitive materials for high-sensitivity stretchable fiber strain sensors

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National science Review 2024年第6期11卷 254-263页

作者： Rouhui Yu Changxian Wang Xiangheng Du Xiaowen Bai Yongzhong Tong Huifang Chen Xuemei Sun Jing Yang Naoji Matsuhisa Huisheng Peng Meifang Zhu Shaowu Pan State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University MOE Key Lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Institute of Fiber Materials and Devices Fudan University Department of Cardiology Shanghai Xuhui Central HospitalZhongshan-Xuhui Hospital Fudan University Research Center for Advanced Science and Technology and Institute of Industrial Science The University of Tokyo

Fiber electronics with flexible and weavable features can be easily integrated into textiles for wearable applications. However, due to small sizes and curved surfaces of fiber materials, it remains challenging to load robust active layers, thus hindering production of high-sensitivity fiber strain sensors. Herein, functional sensing materials are firmly anchored on the fiber surface in-situ through a hydrolytic condensation *** anchoring sensing layer with robust interfacial adhesion is ultra-mechanically sensitive, which significantly improves the sensitivity of strain sensors due to the easy generation of microcracks during stretching. The resulting stretchable fiber sensors simultaneously possess an ultra-low strain detection limit of 0.05%, a high stretchability of 100%, and a high gauge factor of 433.6, giving 254-folds enhancement in sensitivity. Additionally, these fiber sensors are soft and lightweight, enabling them to be attached onto skin or woven into clothes for recording physiological signals, e.g. pulse wave velocity has been effectively obtained by them. As a demonstration, a fiber sensor-based wearable smart healthcare system is designed to monitor and transmit health status for timely intervention. This work presents an effective strategy for developing high-performance fiber strain sensors as well as other stretchable electronic devices.

关键词： fiber strain sensor stretchable wearable healthcare

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Robust flocking for non-identical second-order nonlinear multi-agent systems

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Autonomous Intelligent Systems 2021年第1期1卷 81-90页

作者： Xiuxian Li Housheng Su Li Li Department of Control Science and Engineering College of Electronics and Information Engineeringand Shanghai Research Institute for Intelligent Autonomous SystemsTongji UniversityShanghai 200092China Institute for Advanced Study Tongji UniversityShanghai 200092China School of Automation Image Processing and Intelligent Control Key Laboratory of Education Ministry of ChinaHuazhong University of Science and TechnologyLuoyu Road 1037Wuhan 430074China

This paper investigates the robust flocking problem for second-order nonlinear systems with a leader and external *** contrast with most of second-order systems in the literature,the intrinsic dynamics here are nonlinear and non-identical that depend not only on the velocity but also on the position,which is more ***,the interaction topology is undirected and *** that the leader’s velocity may be constant or time-varying,two distributed flocking control laws have been proposed for two cases to make the differences of the velocities between all followers and the leader approach to zero *** proposed distributed flocking control laws are both model-independent which results in the effectiveness of the controllers to cope with the different intrinsic dynamics of the followers and the leader under some assumptions on boundedness of several *** example is given to illustrate the validity of the theoretical results.

关键词： Flocking Multi-agent systems Second-order nonlinear systems Non-identical dynamics

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Demonstration of IoT Sensors Powered by Ambient RF Energy Harvesting

Demonstration of IoT Sensors Powered by Ambient RF Energy Ha...

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International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, iWAT

作者： Chi-Yuk Chiu Charles Ng Ross Murch Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Kowloon Hong Kong Department of Electronic and Computer Engineering Institute for Advanced Study The Hong Kong University of Science and Technology Kowloon Hong Kong

ISBN: (数字)9798350314755

ISBN: (纸本)9798350314762

Ambient radio frequency (RF) powered Internet of Things (IoT) is a promising batteryless system for collecting environmental information for data exchange among devices. Ambient RF energy harvesting technology is most suitable for use in places that are hidden from light sources and are in difficult to reach places for battery replacement. In this paper, a demonstration of IoT sensors powered by ambient RF energy harvesting is presented. The system we have developed provides all key components from antenna, rectifier, power management unit (PMU), microcontroller unit (MCU) to sensing unit. In addition a novel 3-port antenna element for the systems is also described. The experimental results confirm that ambient RF signals can be regarded as an alternative to power supply in the next generation of wireless communications.

关键词： Radio frequency Wireless communication Power supplies RF signals Rectifiers Sensors Energy harvesting

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Robust Radar Work Mode Recognition in Non-Ideal Situations with GRU-TCN Model

Robust Radar Work Mode Recognition in Non-Ideal Situations w...

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IEEE International Conference on Signal and Image Processing (ICSIP)

作者： Kanglong Ji Xianxiang Yu Yu Huang Kangan Feng Mou Wang Guolong Cui Siyuan Chen School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen China Beijing Institute of Control and Electronic Technology Beijing China

ISBN: (数字)9798350350920

ISBN: (纸本)9798350350937

Dynamic beam-pointing capability of Multi-function radar presents significant challenges in work mode recognition. This paper considers the problem of airborne radar work mode recognition in non-ideal situations, such as measuring noise, lost pulse, and spurious pulse. Specifically, this paper commences with an analysis of the distinctive features exhibited by each work mode and investigates the transition rules between work modes, providing theoretical support for dataset generation. Then, a novel network model called GRU-TCN (Gated Recurrent Unit (GRU)-Temporal Convolutional Network (TCN)) is developed, which first employs a GRU network to extract temporal features among pulses and then leverages a TCN network to decode the extracted features. Simulation results show that the proposed model demonstrates superior performance compared to existing models in non-ideal situations.

关键词： Image recognition Pulse measurements Atmospheric modeling Simulation Noise Logic gates Feature extraction

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Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

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Nano Research Energy 2022年第2期1卷 3-50页

作者： Jie Liang Qian Liu Abdulmohsen Ali Alshehri Xuping Sun Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Institute for Advanced Study Chengdu UniversityChengdu 610106China Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China

To restore the natural nitrogen cycle(N-cycle),artificial N-cycle electrocatalysis with flexibility,sustainability,and compatibility can convert intermittent renewable energy(e.g.,wind)to harmful or value-added chemicals with minimal carbon *** background of such N-cycles,such as nitrogen fixation,ammonia oxidation,and nitrate reduction,is briefly introduced *** discussion of emerging nanostructures in various conversion reactions is focused on the architecture/compositional design,electrochemical performances,reaction mechanisms,and instructive *** device advancements for achieving more functions as well as in situ/operando characterizations toward understanding key steps are also ***,some recently proposed reactions as well as less discussed C-N coupling reactions are also *** classify inorganic nitrogen sources that convert to each other under an applied voltage into three types,namely,abundant nitrogen,toxic nitrate(nitrite),and nitrogen oxides,and useful compounds such as ammonia,hydrazine,and hydroxylamine,with the goal of providing more critical insights into strategies to facilitate the development of our circular nitrogen economy.

关键词： nitrogen cycle heterogeneous electrocatalyst ammonia synthesis metal−N2 battery

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Twinning, Slip and Size Effect of Phase-Transforming Ferroelectric Nanopillars

SSRN

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SSRN 2024年

作者： Zhu, Zeyuan Karami, Mostafa Zhang, Chenbo Chen, Xian Department of Mechanical and Aerospace Engineering Hong Kong University of Science and Technology Hong Kong MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and Engineering Institute for Advanced Study Tongji University Shanghai200092 China

Ferroelectric materials are widely used in energy applications due to their field-driven multiferroic properties. The stress-induced phase transformation plays an important role in the functionality over repeated and consecutive operation cycles, especially at the micro/nanoscales. Here we report a systematic in-situ uniaxial compression tests on cuboidal Barium titanate (BaTiO3) nanopillars with size varying from 100 nm to 3000 nm, by which we explore the stress-induced transformation and its interplay with plastic deformation. We confirm the superelasticity achieved in pillars by martensitic phase transformation from tetragonal to orthorhombic. There exists a critical size, 330nm, for the yield stress. Above 330nm, martensitic phase transformation aids slip along the plane with a low Schmid factor, in turn, the pseudocompatible twins form within the shear band. The scaling exponent of size-dependent yield strength is found to be exactly 1. For nanopillars smaller than 330nm, no twins form, only slips with large Schmid factors are activated, and size effect vanishes. All pillars with sizes from 100nm to 300nm achieve the theoretical yield limit around 9GPa. Our experimental results uncover the interplay between twins and slips in BaTiO3 nanopillars, which pave the way for the optimization of microstructure design of ferroelectric materials for microelectronic applications at small scales. © 2024, The Authors. All rights reserved.

关键词： Ferroelectric materials

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