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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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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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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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Air-Stable Li_(2)C_(6)O_(6) and Li_(4)C_(6)O_(6) as High-Efficiency Lithium Compensation Additives in Cathode

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Energy Material Advances 2024年第1期5卷 78-86页

作者： Mengyan Cao Bingyun Ma Simeng Zhang Huajun Li Hang Chu Yurui Gao Tao Cheng Xuefeng Wang Xueliang Sun Zhaoxiang Wang Liquan Chen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100190China Institute of Functional Nano and Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Eastern Institute for Advanced Study Eastern Institute of TechnologyNingboZhejiang 315200China Laboratory of Theoretical and Computational Nanoscience National Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Tianmu Lake Institute of Advanced Energy Storage Technologies Co.Ltd. Liyang 213300China Department of Mechanical and Materials Engineering University of Western OntarioLondonOntario N6A 3K7Canada

The continuous lithium consumption during cycling severely reduces the energy density of the lithium battery,and thus,lithium compensation is ***,Li_(x)C_(6)O_(6)(x=2,4)was proposed as an air-stable high-efficiency sacrificial additive in the cathode to compensate for the lost lithium ions in solid-state lithium *** a delithiation(oxidation)potential as low as 3.8 V,Li_(2)C_(6)O_(6) can release most of its Li^(+)ions(294.8 mAh g^(−1) in theory).Similarly,Li_(4)C_(6)O_(6) is also characteristic of low oxidation potential and high delithiation capacity(547.8 mAh g^(−1) in theory).The feasibility of using Li_(x)C_(6)O_(6) as the self-sacrificial additive in the cathode was verified with the marked increase of the initial charge capacity of the Li||LiFePO_(4)(half)cells and the initial discharge capacity of Cu||LiFePO_(4)(full)cells,and the improved electrolyte/cathode interface stability and interface contact,in the solid-state poly(ethylene oxide)-lithium bis(trifluoromethane)sulfonimide(PEO-LiTFSI)*** addition,the structure and delithiation of Li_(x)C_(6)O_(6) and the impacts of its decomposition product on the PEO-LiTFSI solid electrolyte were also evaluated on the basis of the comprehensive physical characterizations and the density functional theory(DFT)*** findings open a new avenue for elevating the energy density and/or elongate the lifespan of the solid-state secondary batteries.

关键词： electrolyte cathode interface stability LixC O lithium ions solid state lithium batteries lithium compensation air stable additives density functional theory lithium batteryand

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Design of sampled-data controller for T–S fuzzy system with the refined fractional delayed-state and its applications

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The European Physical Journal Special Topics 2024年 1-16页

作者： Subramaniyam, Ramasamy Annamalai, Manivannan Joo, Young Hoon Department of Mathematics Madanapalle Institute of Technology & Science Madanapalle India School of IT Information and Control Engineering Kunsan National University Gunsan-si Republic of Korea Department of Mathematics School of Advanced Sciences Vellore Institute of Technology Chennai India

The paper is concerned with the development of a sampled-data (SD) controller designed for Takagi–Sugeno (T–S) fuzzy systems. A key highlight is the incorporation of a refined fractional delayed-state into this control approach. The primary aim is to establish criteria for system stabilization, thereby ensuring the asymptotic stability of the considered systems. This objective is pursued within the framework of the newly designed control methodology. The core contribution of work explains in the introduction of an innovative Lyapunov–Krasovskii functional (LKF) tailored to T–S fuzzy systems. This novel approach capitalizes on the efficacy of sampling intervals. The LKF design takes advantage of variable attributes tied to the real sampling pattern, effectively reducing the conservatism of the outcomes. Moreover, the paper introduces a sophisticated fractional delayed-state concept, which plays a pivotal role in shaping a modified looped functional-based LKF. The stability criteria are then formulated through the utilization of linear matrix inequalities (LMIs) and integral inequalities. These criteria perform dynamic part in establishing the asymptotic stability of considered systems when subjected to the designed control approach.

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Passive Measurement of Pressure Wave Speed in Water Pipelines Using Ambient Noise 10th

Passive Measurement of Pressure Wave Speed in Water Pipeli...

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10th International Conference on Wave Mechanics and Vibrations, WMVC 2022

作者： Li, Zhao Lee, Pedro Fink, Mathias Murch, Ross Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand Institut Langevin ESPCI Paris CNRS PSL University 1 rue Jussieu Paris75005 France Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Hong Kong Institute for Advanced Study The Hong Kong University of Science and Technology Hong Kong

ISBN: (纸本)9783031157578

The wave speed of pressure waves in water pipelines is sensitive to the reduction in pipe wall thickness and material strength, and it has been utilized as an indicator of water pipeline deterioration. These probing pressure waves are usually generated actively and is challenging to be incorporated into an automated senor network. This paper proposed a passive wave speed estimation method, which takes cross-correlation of the ambient noise in water pipeline networks measured by two synchronized pressure sensors to estimate the wave travel time. Field experiments were carried out in the operating water reticulation system at University of Canterbury campus for validation. In the experiments, pressure sensors were attached to fire hydrants to measure the ambient noise for 20 min. The experiment results indicate that pressure wave speed can be estimated using the proposed passive method, and the accuracy is at the same level compared with the conventional active method. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Water pipelines

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Preparation of cerium and yttrium doped ZnO nanoparticles and tracking their structural,optical,and photocatalytic performances

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Journal of Rare Earths 2023年第5期41卷 682-688,I0002页

作者： Essia Hannachi Yassine Slimani Muhammad Nawaz R.Sivakumar Zayneb Trabelsi R.Vignesh Sultan Akhtar Munirah A.Almessiere Abdulhadi Baykal Ghulam Yasin Department of Nuclear Medicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Nanomedicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPO.Box 1982Dammam31441Saudi Arabia Department of Physics Alagappa UniversityKaraikudi630003India Faculty of Sciences of Bizerte University of CarthageZarzouna7021Tunisi Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia State Key Laboratory of Chemical Resource Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBejing 100029China Institute for Advanced Study College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Yttrium(Y)and cerium(Ce)co-doped ZnO nanoparticles(NPs)were synthesized via the simple sol-gel auto-combustion *** effect of Ce and Y doping on the structure,morphology,optical,Zeta potential,and photocatalytic activities of ZnO NPs was examined by Fourier transform infrared(FTIR)spectrometer,X-ray diffraction(XRD),transmission electron microscope(TEM),UV-vis spectrophotometer,and Zetasizer *** data show that the fabricated samples crystallize into a hexagonal wurtzite *** dopants Y and Ce affect the crystal structure of ZnO *** crystallite size is reduced with the co-doping *** results confirm the nano-sized particles of the prepared *** increase in optical bandgap values from 3.19 eV for x=0.0 to 3.22,3.24,and 3.25 eV for x=0.01,0.03,and 0.05 samples was confirmed by UV-Vis spectroscopy analysis.Y and Ce co-doped ZnO nanoparticles show significant alteration of zeta potential and photocatalytic properties compared to undoped ZnO ***,undoped ZnO shows better stability in deionized water as compared to Ce-Y doped ZnO NPs and exhibits high photocatalytic activity(degradation rate,97.92%)for methyl orange(MO)degradation.

关键词： ZnO nanoparticles Co-doping Rare earth Structure Bandgap energy Photocatalytic activity

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Nitrogen doping induced by intrinsic defects of recycled polyethylene terephthalate-derived carbon nanotubes

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SusMat 2023年第3期3卷 431-440页

作者： Chuanping Li Lijuan Tong Shuling Wang Qian Liu Yaxin Wang Xuan Li Manxi Wang Manxian Li Xiaochuan Chen Junxiong Wu Qinghua Chen Yiu-Wing Mai Weiwei Fan Yuming Chen Xiaoyan Li Engineering Research Center of Polymer Green Recycling of Ministry of Education Fujian Key Laboratory of Pollution Control&Resource ReuseCollege of Environmental and Resource Sciences and College of Carbon Neutral Modern IndustryFujian Normal UniversityFuzhouFujianChina Hebei International Joint Research Center for Computational Optical Imaging and Intelligent Sensing School of Mathematics and Physics Science and EngineeringHebei University of EngineeringHandanHebeiChina Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronics Engineering J07The University of SydneySydneyNew South WalesAustralia Department of Materials Science and Engineering and Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMassachusettsUSA

The indiscriminate utilization of nondegradable polyethylene terephthalate(PET)-based products has triggered serious environmental pollution that has to be resolved vigorously.A simple synthesis of N-doped carbon nanotubes from recycled PET(NCNTs_(r-PET))was developed by a nitric acid-assisted hydrothermal *** results and theoretical calculations show that the intrinsic defects in CNTs_(r-PET)would induce N-doping by NH_(3)generated from nitric acid during the hydrothermal process,thus producing the NCNTs_(r-PET).The life cycle assessment proves that the developed method for N-doped CNTs using r-PET as the carbon source is more environmentally friendly than the conventional chemical vapor deposition using acetylene as the carbon *** a typical application,the NCNTs_(r-PET)delivered an impressive sodium storage capacity with an ultralong *** work not only provides a new route to upcycling waste plastics into valuable carbonaceous materials in an ecofriendly manner,but also reveals a basic understanding of the N-doping mechanism in carbonaceous materials.

关键词： carbon nanotubes defect-induced N-doping life cycle assessment rechargeable batteries recycled PET

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Forty Plus Years of Model Reduction and Still Learning 63

Forty Plus Years of Model Reduction and Still Learning

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Astolff, A. Beck, C.L. Bhattacharjee, D. Kawano, Y. Moreschini, A. Sandberg, H. Scherpen, J.M.A. Imperial College London Department of Electrical and Electronic Engineering United Kingdom Università di Roma 'Tor Vergata' Dipartimento di Ingegneria Civile e Ingegneria Informatica Italy Univ. of Illinois at Urbana-Champaign IL United States Hiroshima University Graduate School of Advanced Science and Engineering Japan Kth Royal Institute of Technology Stockholm Sweden Engineering and Technology Institute Groningen Faculty of Science and Engineering University of Groningen Jan C. Willems Center for Systems and Control Netherlands

ISBN: (纸本)9798350316339

The approximation of complex dynamical systems models by reduced order models has been considered an important research problem for over four decades, not only in the field of control, but also in economics, image processing, circuit analysis, statistical mechanics, aircraft structures, and more recently in hybrid energy systems, to name just a sampling of fields. In this paper, we provide an overview of the development of balanced truncation and interpolation approaches for reducing linear and non-linear dynamical systems models for the purpose of control analysis and design. © 2024 IEEE.

关键词： Importance sampling

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