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Microwave processing of carbon doped Nickel-Cobalt composites for high-performance supercapacitors

Materials Today: Proceedings 2022年 67卷 1005-1009页

作者： Kumar, Niraj Bhusan Sahoo, Bibhuti Kumar Sahoo, Naresh Soam, Ankur Kumar, Rahul Dash, Barada P. Kumar Sahoo, Prasanta Maharashtra Pune 411025 India Department of Mechanical Engineering Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Chemistry Environmental Science and Technology Program Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Energy Science and Engineering IIT Delhi New Delhi 110016 India

A facile and rapid microwave synthesis method was used to make Co/Ni-carbon black (CB) nanocomposites. Several sophisticated techniques confirm the formation and the effects of carbon nanoparticles incorporated into Co/Ni-CB composites. Carbon engrafted Co/Ni composite demonstrates excellent morphology, more significant area, and higher conductive region, thus improving electrode/electrolyte accessibility to enhance electrochemical kinetics. The interaction and combination of CB with Co/Ni composite shows excellent capacitive behavior, assessed by galvanostatic discharge method, cyclic voltage voltammetry, and electrochemical impedance spectroscopy. CB plays a crucial role in stimulating the formation of robust structures, surface activity, and specific capacitance through enhancing electron transport and catalytic properties. This electrode material (NX3) has the highest specific capacitance of 748 Fg−1 at scan rates of 5 mVs−1 and was found to have excellent cycle stability (92.8%) over 5000 cycles. Solid-state supercapacitors fabricated from developed electrodes are highly effective for brightening LEDs. In this study, we demonstrated for the first time a single-step technique that is both quick and efficient for the synthesis of Co/Ni-carbon black heterostructure by using microwave irradiation. The present work suggests that low-cost electrodes can be used in a wide range of future energy storage systems as a potential hybrid material. © 2022

关键词： Nickel

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Experiments at the JSI TRIGA Research Reactor for Validation of Nuclear Fuel Depletion Calculations

Experiments at the JSI TRIGA Research Reactor for Validation...

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2024 International Conference on Physics of Reactors, PHYSOR 2024

作者： Anže, Pungerčič Vladimir, Radulović Alireza, Haghighat Luka, Snoj Reactor Physics Department "Jožef Stefan" Institute Jamova cesta 39 Ljubljana1000 Slovenia Faculty of Mathematics and Physics University of Ljubljana Jadranska ul. 19 Ljubljana1000 Slovenia Nuclear Engineering Program Mechanical Engineering Dept. Virginia Tech 900 N. Glebe Road United States

ISBN: (纸本)9780894487972

Importance of experimental methods at research reactors for validation of depletion calculation is discussed. The validation of fuel burnup and nuclide inventory, calculated with stochastic Serpent-2 and hybrid RAPID code system, is performed at JSI TRIGA research reactor. Three different experimental method for indirect burnup determination are presented. The experiments are simulated using Serpent-2 and RAPID depletion codes. First experiment is the fuel rod reactivity worth experiment, in which seven differently burned rods were inserted in the reactor and change in core reactivity was measured. Each insertion was simulated with both codes and great agreement (within 1σ) is observed for both codes. Core's excess reactivity reduction due to burnup was analyzed on three mixed TRIGA cores. Burnup reactivity coefficient was studied with both codes and accurate predictions of reactivity change were obtained. Finally, depleted nuclide inventory is used to simulate dosimetry experiment. Axial profile of 197Au(n, γ)198Au reaction rates was studied using MCNP, where fresh fuel model was compared to the burned fuel model. Fuel burnup was obtained from Serpent-2 and RAPID. The results indicate a 6 % better agreement when Serpent-2 and RAPID's burnup is used. All three experiments indicate a method on how research reactor can be used to in-directly determine and validate nuclear fuel burnup without the use of destructive methods. © 2024 AMERICAN NUCLEAR SOCIETY. All rights reserved.

关键词： Research reactors

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Recyclable thin-film soft electronics for smart packaging and e-skins

arXiv

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arXiv 2025年

作者： Carneiro, Manuel Reis de Almeida, Aníbal T. Tavakoli, Mahmoud Majidi, Carmel Soft Machines Lab Department of Mechanical Engineering Carnegie Mellon University PittsburghPA15213 United States Institute of Systems and Robotics Department of Electrical and Computer Engineering University of Coimbra Coimbra3030-290 Portugal

Despite advances in soft, sticker-like electronics, few efforts have dealt with the challenge of electronic waste. Here, we address this by introducing an eco-friendly conductive ink for thin-film circuitry composed of silver flakes (Ag) and a water-based polyurethane (WPU) dispersion. This ink uniquely combines high electrical conductivity (1.6x105 S/m), high resolution digital printability, robust adhesion for microchip integration, mechanical resilience, and recyclability. Recycling is achieved with an ecologically-friendly processing method to decompose the circuits into constituent elements and recover the conductive ink with a decrease of only 2.4% in conductivity. Moreover, adding liquid metal enables stretchability of up to 200% strain, although this introduces the need for more complex recycling steps. Lastly, we demonstrate on-skin electrophysiological monitoring biostickers along with a recyclable smart package with integrated sensors for monitoring safe storage of perishable foods. © 2025, CC BY-NC-ND.

关键词： Electronic Waste

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Reconfigurable Smart Grid Management for Electric Vehicle Charging and the Integration of Renewable Energy Sources using Pied Kingfisher Optimizer

Reconfigurable Smart Grid Management for Electric Vehicle Ch...

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Machine Learning and Autonomous Systems (ICMLAS), International Conference on

作者： M. Sivaramkrishnan M. Siva Ramkumar Kaparthi Uday Mohammad Kanan C. Mohan Raj Jayant Giri Dept of EEE Karpagam College of Engnieering India Dept of ECE SNS College of Technology EIE Department CVR College of Engineering Ibrahimpatanam Hyderabad Department of Industrial Engineering College of Engineering University of Business and Technology Jeddah Saudi Arabia Department of Mechanical Engineering College of Engineering Zarqa University Zarqa Jordan Department or EEE Centre for Robotics and Industrial Automation Sri Eshwar College of Engineering Coimbatore Department of Mechanical Engineering Yeshwantrao Chavan College of Engineering Nagpur India Division of Research and Development Lovely Professional University Phagwara

ISBN: (数字)9798331505745

ISBN: (纸本)9798331505752

Electric Vehicle (EV) charging management under the Smart Grid (SG) framework with incorporated Renewable Energy Sources (RESs) functions to advance Energy Management (EM). The operational cost of EV charging varies because renewable energy availability can change so this affects the financial performance of charging operations. Integration of RESs with the SG becomes challenging for operational system efficiency particularly when renewable energy generation levels are low. To overcome these drawbacks, this manuscript proposes an efficient approach for SG management for EV charging with the integration of RESs. The suggested method is Pied Kingfisher Optimizer (PKO). The main aim of the suggested technique is to minimize the operational expenses of EV charging as well as maximize the efficiency of the SG system. The PKO is used to optimize the scheduling and allocation of energy resources within the SG system. By then, the suggested approach is implemented in MATLAB and contrasted with several other methods that are currently in use. The suggested technique outperforms all existing approaches such as Bald Eagle Search (BES), Red Kite Optimization (RKO), Artificial Neural Network-Particle Swarm Optimization (ANN-PSO), and Coati Optimization Algorithm-Constitutive Artificial Neural Network (COA-CANN). The suggested approach delivers superior performance than conventional methods by reducing operational costs to 638,322$ under coordinated charging and 629,745$ under smart charging without impacting system performance metrics.

关键词： Renewable energy sources Costs System performance Artificial neural networks Power system stability Stability analysis Smart grids Wind turbines Resource management Smart charging

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Quantitative Analysis of Ankle Spasticity Through Electromyography Signal

Quantitative Analysis of Ankle Spasticity Through Electromyo...

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Medical Technologies National Conference (TIPTEKNO)

作者： Ayse Gurluk Hafiz Muhammad Bilal Elif Hocaoglu Living Robotics Laboratory Graduate School of Health Sciences Physiotherapy and Rehabilitation Program Istanbul Medipol University Istanbul Türkiye Living Robotics Laboratory Graduate School of Engineering and Natural Sciences Electrical-Electronics Engineering and Cyber-Systems Program Istanbul Medipol University Istanbul Türkiye Department of Electrical and Electronics Engineering Living Robotics Laboratory Istanbul Medipol University Istanbul Türkiye

ISBN: (数字)9798331529819

ISBN: (纸本)9798331529826

This study presents a more accurate evaluation method for assessing ankle spasticity compared to conventional goniometric techniques by utilizing measurements obtained from Inertial Measurement Units (IMU) and surface electromyography (sEMG) devices. Integrating IMU and EMG sensors provides substantial benefits for accurately determining the range of motion (ROM) associated with spasticity during targeted movements. In this study, the proposed method provides precise measurement and an objective evaluation of onset time detection of antagonistic muscle co-contraction, and accordingly the ROM of the actuated joint. Moreover, the implementation of cost-effective wearable sensors enables the monitoring of muscle spasticity in clinical environments and can be particularly valuable in regions with limited access to experienced therapists, providing a more efficient approach to tracking spasticity levels.

关键词： Ankle Measurement units Inertial navigation Muscles Electromyography Sensors Reliability Motion control Read only memory Monitoring

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Electric Vehicle Charging Navigation Using Waterwheel Plant Algorithm for Coordinating Smart Grids and Intelligent Transportation Systems

Electric Vehicle Charging Navigation Using Waterwheel Plant ...

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Machine Learning and Autonomous Systems (ICMLAS), International Conference on

作者： M. Siva Ramkumar M. Sivaramkrishnan Kaparthi Uday Mohammad Kanan C. Mohan Raj Jayant Giri Dept of ECE SNS College of Technology Dept of EEE Karpagam College of Engnieering India EIE Department CVR College of Engineering Ibrahimpatanam Hyderabad Department of Industrial Engineering College of Engineering University of Business and Technology Jeddah Saudi Arabia Department of Mechanical Engineering College of Engineering Zarqa University Zarqa Jordan Department or EEE Centre for Robotics and Industrial Automation Sri Eshwar College of Engineering Coimbatore Department of Mechanical Engineering Yeshwantrao Chavan College of Engineering Nagpur India Division of Research and Development Lovely Professional University Phagwara India

ISBN: (数字)9798331505745

ISBN: (纸本)9798331505752

The efficient charging of electric vehicles (EVs) remains essential to create sustainable mobility while EVs transform into crucial elements of upcoming transportation systems. The present EV charging navigation systems deal with three main issues including grid congestion and inadequate charging station (CS) selection and delays from traffic *** paper proposes a novel Waterwheel Plant Algorithm (WWPA) for optimizing EV charging navigation within the Smart Grid (SG) and Intelligent Transportation Systems (ITS). The suggested method strives to enhance SG-EV coordination through demand balancing in addition to charge price reduction and decreased grid congestion levels. WWPA algorithm serves as the proposed method to optimize EV charging schedules. The MATLAB platform serves as the implementation environment for the proposed method which demonstrates superior performance than Multi-agent Reinforcement Learning (MARL), Deep Reinforcement Learning (DRL), Coati-Northern Goshawk Optimization (Coati-NGO) and Grey Sail Fish Optimization (GSFO). Results demonstrate that the WWPA algorithm reduces average charging expenses by 18.14% throughout diverse charging operations as it produces superior performance than existing algorithms operating in the SG ITS.

关键词： Navigation Heuristic algorithms Transportation Transforms Traffic control Electric vehicle charging Smart grids Delays Vehicle dynamics Testing

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Specular Inverse Faraday Effect in Transition Metals

arXiv

引用

arXiv 2023年

作者： Ortiz, Victor H. Mishra, Shashi B. Vuong, Luat Coh, Sinisa Wilson, Richard B. Department of Mechanical Engineering and Materials Science and Engineering Program University of California RiversideCA92521 United States

The inverse Faraday effect is an opto-magnetic phenomenon that describes the ability of circularly polarized light to induce magnetism in solids. The capability of light to control magnetic order in solid state materials and devices is of interest for a variety of applications, such as magnetic recording, quantum computation and spintronic technologies. However, significant gaps in understanding about the effect persist, such as what material properties govern the magnitude of the effect in metals. In this work, we report time-resolved measurements of the specular inverse Faraday effect in non-magnetic metals, i.e., the magneto-optic Kerr effect induced by circularly polarized light. We measure this specular inverse Faraday effect in Cu, Pd, Pt, W, Ta, and Au at a laser wavelength of 783 nm. For Ta and W, we investigate both α and β phases. We observe that excitation of these metals with circularly polarized light induces significant circular dichroism. This nonlinear magneto-optical response to circularly polarized light is an order of magnitude larger in α-W than other metals, e.g., Pt, Au, and is greater than nearly all other reported values for the inverse Faraday effect in other materials. Our results benchmark the range of the inverse Faraday effect that can be observed in non-magnetic metals and provide insight into what material properties govern the inverse Faraday effect in metals. © 2023, CC BY.

关键词： Light polarization

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Therapeutic limb hypothermia for the treatment of traumatic acute limb ischemia

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Journal of Medical engineering and Technology 2024年第2期48卷 39-47页

作者： Kao, Emily Germany, Jason O. Shasheendra, Abhijith Mhetre, Ketan Wang, Xu Ringgold, Kristyn Patel, Sahil Emery, Ashley Bulger, Eileen M. White, Nathan Aarabi, Shahram Department of Surgery Highland Hospital University of California San Francisco-East Bay OaklandCA United States Industrial Design Program School of Art + Art History + Design University of Washington SeattleWA United States Department of Mechanical Engineering University of Washington SeattleWA United States Department of Emergency Medicine University of Washington SeattleWA United States Department of Surgery University of Washington SeattleWA United States

Acute limb ischaemia (ALI) is an emergent clinical condition that strains pre-hospital resources and impacts healthcare costs and patient quality of life. Hypothermia has long been used in clinical and research settings to mitigate ischaemic damage in tissues, but prompt reperfusion is needed to prevent loss of limb or function from ALI. To address the unmet need for pre-hospital intervention of threatened limbs awaiting definitive specialty care, we have focused on controlled application of hypothermia. Over years of animal experiments, phantom limb creation, and materials selection, we conceptualised and created a portable limb-cooling device that can be used alone or combined with a traditional tourniquet or resuscitative endovascular balloon occlusion of the aorta. Here, we describe our process of building and testing the device, from computer simulation through animal-limb metabolic studies, to prototype testing. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Hospitals

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Design of a Variable Stiffness Spring with Human-Selectable Stiffness

Design of a Variable Stiffness Spring with Human-Selectable ...

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IEEE International Conference on robotics and Automation (ICRA)

作者： Chase W. Mathews David J. Braun Department of Mechanical Engineering Advanced Robotics and Control Laboratory within the Center for Rehabilitation Engineering and Assistive Technology Vanderbilt University Nashville Tennessee USA

Springs are commonly used in wearable robotic devices to provide assistive joint torque without the need for motors and batteries. However, different tasks (such as walking or running) and different users (such as athletes with strong legs or the elderly with weak legs) necessitate different assistive joint torques, and therefore, springs with different stiffness. Variable stiffness springs are a special class of springs which can exert more or less torque upon the same deflection, provided that the user is able to change the stiffness of the spring. In this paper, we present a novel variable stiffness spring design in which the user can select a preferred spring stiffness similar to switching gears on a bicycle. Using a leg-swing experiment, we demonstrate that the user can increment and decrement spring stiffness in a large range to effectively assist the hip joint during leg oscillations. Variable stiffness springs with human-selectable stiffness could be key components of wearable devices which augment locomotion tasks, such as walking, running, and swimming.

关键词：

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Development of High-Speed Laser Absorption Scattering (HS-LAS) System for Measuring Vapor and Liquid Phase Concentration Distributions in Evaporating Diesel Spray 10

Development of High-Speed Laser Absorption Scattering (HS-LA...

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10th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2022

作者： Ray, Samir Chandra Naito, Shinichiro Safiullah Andersson, Mats Nishida, Keiya Ogata, Yoichi Sasaki, Hiroyasu Department of Mechanical Systems Engineering Graduate School of Engineering University of Hiroshima Japan Department of Mathematics Bangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh Mechanical Engineering Program Graduate School of Advanced Science and Engineering University of Hiroshima Japan Department of Mechanics and Maritime Sciences Chalmers University of Technology Goteborg Sweden Nac Image Technology Inc. Japan

The fundamental concept of the LAS technique is to understand the fuel concentration by attenuation of both visible and ultraviolet light. The intensity of visible light is only attenuated by the scattering of droplets, while that of ultraviolet light is attenuated by the scattering of droplets and the absorption of vapors. The conventional LAS uses the ND: YAG pulse laser, CCD cameras and one shot for one spray, which takes time and effort. Moreover, temporal variation measurement of a single shot spray is not possible by the conventional LAS. To record the distribution of the whole vapor phase in an injection event and measure the liquid and vapor concentration inside the spray, a high-speed laser absorption scattering (HS-LAS) technique was developed applying continuous diode light source, high-speed video cameras, and image intensifier for UV light, which can provide the temporal variation of a single shot spray. In the experiment, a commercial seven-hole injector with a hole diameter of 0.123 mm allowing high injection pressure up to 100 MPa was used to avoid the potential inconsistencies with single-hole test injector. The diesel surrogate fuel which consists of 97.5 % n-tridecane and 2.5 % of volume-based 1-methylnaphthalene was used. The injection amount 5.0 mg/hole were selected to investigate the structure and mixture formation process of the spray. The findings of the experiments show that this imaging approach is a promising diagnostic technique for concurrently obtaining quantitative information on the quantity of vapor and droplets in a fuel spray. Furthermore, the turbulent/vortex fluid dynamics' temporal development/variation can be investigated. © 2022 by the Japan Society of mechanical Engineers All rights reserved.

关键词： Diesel engines

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