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A review of understanding electrocatalytic reactions in energy conversion and energy storage systems via scanning electrochemical microscopy

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Journal of Energy Chemistry 2024年第4期91卷 155-177页

作者： Jihye Park Jong Hwan Lim Jin-Hyuk Kang Jiheon Lim Ho Won Jang Hosun Shin Sun Hwa Park Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of Material Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

To address climate change and promote environmental sustainability,electrochemical energy conversion and storage systems emerge as promising alternative to fossil fuels,catering to the escalating demand for *** optimal energy efficiency and cost competitiveness in these systems requires the strategic design of electrocatalysts,coupled with a thorough comprehension of the underlying mechanisms and degradation behavior occurring during the electrocatalysis *** electrochemical microscopy(SECM),an analytical technique for studying surface electrochemically,stands out as a powerful tool offering electrochemical *** possesses remarkable spatiotemporal resolution,enabling the visualization of the localized electrochemical activity and surface *** review compiles crucial research findings and recent breakthroughs in electrocatalytic processes utilizing the SECM methodology,specifically focusing on applications in electrolysis,fuel cells,and metal–oxygen batteries within the realm of energy conversion and storage *** with an overview of each energy system,the review introduces the fundamental principles of SECM,and aiming to provide new perspectives and broadening the scope of applied research by describing the major research categories within SECM.

关键词： Scanning electrochemical microscopy Electrocatalyst Electrocatalysis Water splitting Fuel cell Metal-oxygen battery

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Size effects on the mixed modes and defect modes for a nano-scale phononic crystal slab

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Applied Mathematics and Mechanics(English Edition) 2023年第1期44卷 21-34页

作者： Jun JIN Ningdong HU Hongping HU Department of Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Huazhong University of Science and TechnologyWuhan 430074China

The size-dependent band structure of an Si phononic crystal(PnC)slab with an air hole is studied by utilizing the non-classic wave equations of the nonlocal strain gradient theory(NSGT).The three-dimensional(3D)non-classic wave equations for the anisotropic material are derived according to the differential form of the *** on the the general form of partial differential equation modules in COMSOL,a method is proposed to solve the non-classic wave *** bands of the in-plane modes and mixed modes are *** in-plane size effect and thickness effect on the band structure of the PnC slab are *** is found that the thickness effect only acts on the mixed *** relative width of the band gap is widened by the thickness *** effects of the geometric parameters on the thickness effect of the mixed modes are further studied,and a defect is introduced to the PnC supercell to reveal the influence of the size effects with stiffness-softening and stiffness-hardening on the defect *** study paves the way for studying and designing PnC slabs at nano-scale.

关键词： band structure phononic crystal(PnC) nonlocal strain gradient theory(NSGT) size effect

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On the Necessity for Improving Effectiveness of Qualification Process for Spare Parts Additive Manufacturing in a Circular Economy Supply Chain

On the Necessity for Improving Effectiveness of Qualificatio...

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2022 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2022

作者： Chandima Ratnayake, R.M. University of Stavanger Department of Mechanical and Structural Engineering and Material Science Norway

ISBN: (数字)9781665486873

ISBN: (纸本)9781665486873

Additive manufacturing (AM) has attracted extensive research attention, due to the flexibility and capability to deal with additive manufactured (AM 'ed) parts with complicated geometries. Benefiting from the recent development of material technology, manufacturing control tools, and integrated platforms, powder bed fusion (PBF) based AM has been successfully extended to build free form metallic parts. A more comprehensive understanding of the powder processing thermos mechanical metallurgical characteristics correlation is still lacking for the metallic AM. The metallic AM process involves non-uniform temperature distributions and rapid thermal cycles that result in microstructures featured with porosity and anisotropy. The different microstructure features critically affect the mechanical properties of the AM'ed parts. It is necessary to establish optimal parameters' combination that provides predefined microstructure in an AM process to achieve desired mechanical properties of the AM builds. The AM'ed parts qualification is a requirement to assure accurate and repeatable builds. First, this manuscript demonstrates the use of parameter design approach for simulations and experimental validation to establish optimal parameter combinations to develop a qualification record. Second, it presents a framework illustrating how to perform feedstock metal powder production, AM of parts, qualification, and reuse of material in an integrated circular economy supply chain. © 2022 IEEE.

关键词： Supply chains

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Temperature-and Pressure-Dependent Emissions and Crystal-Glass Transition of a Hybrid Manganese Bromide

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Chinese Journal of Chemistry 2025年第5期43卷 501-507页

作者： Kai Li Zi-Ying Li Hui-Rong Dong Yan Chen Zhi-Gang Li Yong-Qiang Chen Rui Feng Wei Li Department of Chemistry and Chemical Engineering Jinzhong UniversityJinzhongShanxi030619 China School of Materials Science and Engineering Smart Sensing Interdisciplinary Science CenterNankai University&TKL of Metal and Molecule Based Material ChemistryTianjin300350 China

Comprehensive Summary Herein,the temperature-and pressure-stimulated responsive behavior as well as crystal-glass phase transition of a new zero-dimensional hybrid manganese bromide[4-MTPP]2[MnBr4][4-MTPP+=(4-methoxybenzyl)tris(phenyl)phosphonium]were *** experiment results demonstrate that[4-MTPP]2[MnBr4]shows typical green photoluminescence emission centered at 522.4 nm excited by UV light.

关键词： Hybrid manganese halides Photoluminescence Stimuli-responsive behavior Crystal-glass phase transition

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Robust H-infinity Control for the Longitudinal Dynamics of a Fixed Wing Aircraft

Robust H-infinity Control for the Longitudinal Dynamics of a...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Rashad, Maha El-Badawy, Ayman Hamza, Abdelaziz Faculty of Engineering Mechanical Engineering Department German International University Cairo Egypt Faculty of Engineering and Material Science Mechatronics Engineering Department German University in Cairo Cairo Egypt

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In this paper, the design and application of a feedback-linearization-based controller combined with a robust µ-synthesis for trajectory tracking for the longitudinal dynamics of an aircraft is presented. This approach is compared with a full-state feedback controller to validate this control strategy. The proposed approach aims to enhance the robustness and performance of the system in the presence of various uncertainties and disturbances, including unmodeled nonlinear dynamics and wind disturbances. The feedback linearization technique is used to eliminate model non-linearities to enable linear control methodologies to be effectively applied. Subsequently, a µ-synthesis controller is designed to ensure robust performance and stability under structured uncertainties. The simulation results indicate that the proposed controller effectively ensures the aircraft follows the desired position trajectories, despite the presence of wind disturbances and unmodeled nonlinear dynamics, thus, the control system satisfies the requirements. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Feedback linearization

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High micropore-utilization carbon aerogel with controlled nanostructures via adjusting aggregation state of polyacrylonitrile for energy storage systems

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SusMat 2024年第4期4卷 27-38页

作者： Yuanyou Peng Yihan Fu Meimei Yu Lei Zhao Huanzhong Zeng Shengtao Niu Jie Zhang Junlong Chen Guang Liu Youzhi Wu Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Department of Polymeric Materials EngineeringSchool of Material Science and EngineeringLanzhou University of TechnologyLanzhouChina

Designing and optimizing the pore structure of porous carbon electrodes is essen-tial for diverse energy storage *** this study,an innovative approach spray phase-inversion strategy was developed for the rapid and efficient fabri-cation of controlled porous carbon ***,the aggregation structure of polyacrylonitrile is controlled by adjusting the Hansen’s solubility parameter,thereby regulating the electrode material ***,the theoretical analysis of the spray phase-inversion process revealed that this regulation pro-cess is jointly regulated by solvent hydrodynamic diameter and phase-inversion *** optimization,a novel porous carbon material was obtained that exhibited excellent performance as an electrode *** utilized in supercapacitors for energy storage,it demonstrated a high specific capacitance of 373.1 F g^(-1) in a 6 M KOH electrolyte ***,it has been observed that the preparation strategy for porous electrodes offers notable advan-tages in terms of excellent designability,broad universality,simplicity,and high efficiency,thereby holding promise for large-scale fabrication of diverse porous electrode materials and various types of electrodes for diverse energy storage applications.

关键词： aggregation structure electrode materials phase inversion porous carbon supercapacitors

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Metal and ligand modification modulates the electrocatalytic HER,OER,and ORR activity of 2D conductive metal-organic frameworks

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Nano Research 2024年第9期17卷 7984-7990页

作者： Yanan Zhou Li Sheng Lanlan Chen Wenhui Zhao Wenhua Zhang Jinlong Yang School of Material Science and Chemical Engineering Institute of Mass SpectrometryNingbo UniversityNingbo 315211China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026China Department of Physics Ningbo UniversityNingbo 315211China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion and Synergetic Innovation Centre of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China

It is highly desirable to design efficient and stable hydrogen evolution reaction(HER)and oxygen evolution/reduction reaction(OER/ORR)electrocatalysts for the development of renewable energy ***,density functional theory(DFT)calculations were conducted to systematically investigate a series of TMN_(x)O_(4-x)-HTT(TM=Fe,Co,Ni,Ru,Rh,Pd,Ir and Pt;HTT=hexahydroxy tetraazanaphthotetraphene)analogs of two-dimensional(2D)conductive metal-organic frameworks(MOFs)as potential electrocatalysts for the HER,OER and *** thermodynamic and electrochemical stability simulations suggest that these designed catalysts are ***,CoO_(4)-HTT,RhN_(3)O_(1)-HTT and IrN3O1-HTT are predicted to be the most promising catalysts for the HER,OER and ORR,respectively,surpassing the catalytic activity of corresponding benchmark *** volcano plots were established based on the scaling relationship of adsorption Gibbs free energy of *** results reveal that regulating combinations of metal active centers and local coordination environments could effectively balance the interaction strength between intermediates and catalysts,thus achieving optimal catalytic *** findings not only opt for the promising HER/OER/ORR electrocatalysts but also guide the design of efficient electrocatalysts based on 2D MOFs materials.

关键词： hydrogen evolution reaction(HER) oxygen evolution/reduction reaction(OER/ORR) electrocatalysts design twodimensional(2D)conductive metal-organic frameworks(MOFs) density functional theory(DFT)

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Numerical simulations of ship collision with offshore UHPC structures 9th

Numerical simulations of ship collision with offshore UHPC s...

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9th International Conference on Collision and Grounding of Ships and Offshore Structures, ICCGS 2023

作者： Sha, Yanyan Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Stavanger Norway

ISBN: (纸本)9781032611303

Reinforce concrete (RC) structures have been used to construct various types of offshore structures in the past decades. Reinforce concrete has many advantages such as high strength, relatively low cost, and easy maintenance. Therefore, reinforced concrete has been used to construct the supporting structures of offshore platforms, wind turbines, and floating bridges. Nonetheless, offshore reinforced concrete structures are under the threat of collision loads from service and passing ships. Since offshore reinforced concrete structures are typically thin-walled structures, one major issue is the punching shear damage of such structures under ship collision loads. Recently, ultra-high-performance concrete (UHPC) has been increasingly used for onshore structures. UHPC has demonstrated higher impact resistance than ordinary reinforced concrete. However, research on UHPC structures under ship collision loads has seldom been conducted. In this paper, numerical simulations of ship collision with thin-walled UHPC structures are conducted using detailed finite element models. The application of different UHPC material models on ship collision simulations is discussed. The response of UHPC and normal RC structures are also compared. It is found that with calibrated parameters, the CSCM material model in LS-DYNA can be used for modelling UHPC in ship collision simulations. The results show that using UHPC material can effectively increase the ship collision resistance of offshore structures compared with ordinary reinforced concrete. © 2024 The Author(s).

关键词： Reinforced concrete

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Ultimate and residual strength assessments of intact and collision damaged columns of the Bjørnafjorden floating bridge 9th

Ultimate and residual strength assessments of intact and col...

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9th International Conference on Collision and Grounding of Ships and Offshore Structures, ICCGS 2023

作者： Yu, Zhaolong Wang, Xintong Moan, Torgeir Amdahl, Jørgen Sha, Yanyan Norway Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Norway

ISBN: (纸本)9781032611303

The Norwegian Public Road Administration (NPRA) has initiated an ambitious project to replace the current ferry crossing solutions with floating bridges over the wide and deep Norwegian fjords. This will substantially reduce the travelling time among major cities in Norway. It is found that ship collisions represent major critical loads to the safety and integrity of floating bridges that governs the structural design. This paper investigates the ultimate and residual strength of columns in an initial design of the Bjørnafjorden floating bridge before and after ship collisions with an initial kinetic energy of 125 MJ and 150 MJ respectively corresponding to a 10,000-year event as estimated from risk assessment. The ultimate bending and torsional capacities are assessed. Three different approaches are adopted, (1) the nonlinear finite element method using LS-DYNA;(2) A semi-analytical code PULS based on energy methods;(3) DNV rules-based formulations. The results are compared and discussed. © 2024 The Author(s).

关键词： structural design

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Developing Predictive Maintenance Framework for Wind Turbine Blade Erosion: State of the Art and Concept Analysis

Developing Predictive Maintenance Framework for Wind Turbine...

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2024 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2024

作者： Ali, Waqar El-Thalji, Idriss Giljarhus, Knut Erik Teigen Delimitis, Andreas Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Stavanger Norway

ISBN: (纸本)9798350386097

The global goal of achieving 2000 gigawatts of offshore wind power by 2050 has driven the development of the wind energy sector. This ambitious goal is facing a significant challenge in maintaining the efficiency and health of the wind turbines. Wind turbine Blade erosion is among the main critical failure modes that lead to high production losses and maintenance expenses. At present, the industry is utilizing manual or drone-based inspection, however, they are targeting more cost-effective and more informative like to predictive maintenance for erosion and severity by using data science techniques based on SCADA and sensors data. This paper reviews existing erosion blade analysis methods in wind turbines, highlighting their strengths and weaknesses. The method is based on the literature review to determine the state of the art in terms of monitoring, classification, and prediction. Moreover study will evaluate potential predictive maintenance concepts based on key performance matrix extracted from key stakeholders. It can be concluded that a combined concept of vibration, aerodynamic, acoustic, and production loss techniques supported with XGBoost, FFT, and LSTM are the most effective methods. © 2024 IEEE.

关键词： Turbomachine blades

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