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2024 IEEE Photonics Conference, IPC 2024

作者： Zhang, Ziyao Skandalos, Ilias Ma, Rui Chen, Minjia Zhong, Chuan Gardes, Frederic Cheng, Qixiang Penty, Richard University of Cambridge Centre for Photonic Systems Electrical Engineering Division Department of Engineering CambridgeCB3 0FA United Kingdom University of Southampton Optoelectronics Research Centre SouthamptonSO17 1BJ United Kingdom Princeton University Electrical and Computer Engineering PrincetonNJ08544 United States

We demonstrate a novel bending structure on silicon nitride towards a monolithically integrated laser platform. This bending structure has a deep etched groove along the outer side, and can greatly reduce the footprin... 详细信息

ISBN: (纸本)9798350361957

关键词： Silicon nitride

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An Algorithm for the Protection of Distribution Feeders Using the Stockwell and Hilbert Transforms Supported Features

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CSEE Journal of Power and Energy Systems 2021年第6期7卷 1278-1288页

作者： OM Prakash Mahela Jaya Sharma Bipul Kumar Baseem Khan Hassan Haes Alhelou the Power System Planning Division Rajasthan Rajya Vidyut Prasaran Nigam Ltd.Jaipur-302005India Department of Electrical Engineering Rajasthan College of Engineering for WomenJaipurIndia the Department of Electrical and Computer Engineering Hawassa UniversityHawassa 1530Ethiopia the Department of Electrical Power Engineering Faculty of Mechanical and Electrical EngineeringTishreen UniversityLattakia 2230Syria

Faults’recognition in the distribution feeders(DFs)is extremely important for improving the reliability of the distribution ***,this paper proposes a technique to identify the faults on the DF using the Stockwell Transform(ST)dependent variance feature and Hilbert transform(HT)by utilizing current *** element to element multiplication of the H-index,we compute using HT aided decompositions of current waveforms and VS-index,and calculate through ST aided decomposition of current *** utilizing the decision rules,various faults are *** faults studied in this work are line to ground,double line,double line to ground and 3-Φto *** high fault impedance,this technique is effectively ***,variations in the fault incidence angles are also utilized to test the performance of the proposed *** perform the proposed algorithm,a IEEE-13 bus system is developed in MATLAB/Simulink *** algorithm effectively classified the faults with accuracy greater than 98%.The algorithm is also successfully validated on the IEEE-34 bus test ***,the algorithm was successfully validated on the practical power system *** is recognized that the developed method performed better than the discrete Wavelet transform(DWT)and ruled decision tree based protection scheme reported in various literature.

关键词： Fault classification fault recognition H-index VS-index

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Placement, Orientation, and Resource Allocation Optimization for Cell-Free OIRS-aided OWC Network

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IEEE Transactions on Vehicular Technology 2025年第6期74卷 10011-10016页

作者： Jalali, Jalal Tabassum, Hina Famaey, Jeroen Saad, Walid Uysal, Murat University of Antwerp - imec IDLab research group Antwerp2000 Belgium JuliaSpace Inc. Wireless Communication Research Group ChicagoIL United States TorontoONM3J 1P3 Canada Virginia Tech Bradley Department of Electrical and Computer Engineering United States Engineering Division Abu Dhabi129188 United Arab Emirates

The emergence of optical intelligent reflecting surface (OIRS) technologies marks a milestone in optical wireless communication (OWC) systems, enabling enhanced control over light propagation in indoor environments. This capability allows for the customization of channel conditions to achieve specific performance goals. This paper presents an enhancement in downlink cell-free OWC networks through the integration of OIRS. The key focus is on fine-tuning crucial parameters, including transmit power, receiver orientations, OIRS elements allocation, and strategic placement. In particular, a multi-objective optimization problem (MOOP) aimed at simultaneously improving the network's spectral efficiency (SE) and energy efficiency (EE) while adhering to the network's quality of service (QoS) constraints is formulated. The problem is solved by employing the ϵ-constraint method to convert the MOOP into a single-objective optimization problem and solving it through successive convex approximation. Simulation results show the significant impact of OIRS on SE and EE, confirming its effectiveness in improving OWC network performance. © 1967-2012 IEEE.

关键词： Spectrum efficiency

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Network Parameter Control in Cellular Networks through Graph-Based Multi-Agent Constrained Reinforcement Learning 19

Network Parameter Control in Cellular Networks through Graph...

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19th IEEE International Conference on Automation Science and engineering, CASE 2023

作者： Forsberg, Albin Larsson Nikou, Alexandros Feljan, Aneta Vulgarakis Tumova, Jana Stockholm Sweden Kth Division of Robotics Perception and Learning Department of Electrical Engineering and Computer Science Stockholm Sweden Digital Futures United States

ISBN: (纸本)9798350320695

Cellular networks are growing in complexity at increasing speed and the geographical locations in which they are deployed in are getting denser. Traditional control methods fall short in providing a scalable and dynamic way of adapting the network to new conditions. Distributed multiagent reinforcement learning successfully addresses scalability problems seen in centralized approaches. The question of achieving learning with constraint satisfaction in distributed systems is still left unanswered in the state-of-the-art. In this work, we aim to perform distributed multi-agent constrained reinforcement learning in order to learn a policy online while satisfying imposed constraints. We use a coordination graph to model the interactions between agents and decompose the global value function. A conservative safety critic is trained in parallel to evaluate the safety of proposed actions. Our method allows for separate training of both the critic and the value network independently of each other, and hence offers flexibility in how and when to train the different models. The results are compared to a baseline using no safety critic. Simulations show that the agents succeed in learning a policy that can satisfy the constraints, while still maximizing the objective. © 2023 IEEE.

关键词： Graphic methods

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Hydrogen Supply Infrastructure Planning Method Considering Indirect Network Effects

Hydrogen Supply Infrastructure Planning Method Considering I...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Deng, Haoran Yang, Bo Zhu, Dafeng Yao, Gang Guan, Xinping Srinivasan, Dipti Shanghai Jiao Tong University Department of Automation Shanghai China Kth Royal Institute of Technology Electric Power and Energy Systems Division Stockholm Sweden Shanghai Jiao Tong University Department of Electrical Engineering Shanghai China National University of Singapore Department of Electrical & Computer Engineering Singapore

ISBN: (纸本)9798350376067

At the early commercialization stage of hydrogen fuel cell vehicles (HFCVs), there is a strong causal relationship between HFCV parc and hydrogen refueling stations (HRSs) planning, also known as indirect network effects. This is a crucial factor that hasn't been considered and cannot be ignored in the hydrogen supply infrastructure planning (HSIP) problem. To model the indirect network effects, we quantify the effect of HRS planning on HFCV parc in detail by proposing the calculation method of drivers' fuel buffer, defining hydrogen refueling convenience, and incorporating coupled constraints between the hydrogen network and transportation network. Further, we characterize the effect of HFCVs on HRS planning by constructing a decision-dependent distributionally robust optimization problem considering the HFCV parc uncertainty. We innovatively quantify the upper bound of the ambiguity set of Wasserstein associated with both the endogenous and exogenous factors. We propose effective linearization methods to deal with the nonlinear constraints in the indirect network effects model and transform the two-stage optimization problem into a solvable MILP problem. The simulation results show that the proposed method can obtain more economical investment decisions and achieve higher energy utilization efficiency. More importantly, in this planning framework, investors can set model parameters more flexibly according to the situation of the HFCV market, thereby promoting the popularization of HFCVs. © 2024 IEEE.

关键词： Hydrogen fuels

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A Printed Monopole Antenna for Next Generation Internet of Things: Narrow-Band Internet of Things (NB-IoT)

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Progress In Electromagnetics Research C 2023年 138卷 117-129页

作者： Bhardwaj, Sneha Malik, Praveen K. Islam, Tanvir Gehlot, Anita Das, Sudipta Asha, Sivaji Department of Electronics and Communication Lovely Professional University Jalandhar India Department of Electrical and Computer Engineering University of Houston HoustonTX77204 United States Division of Research and Innovation Uttaranchal University Uttrakhand Dehradun248007 India Department of Electronics and Communication Engineering IMPS College of Engineering and Technology West Bengal Malda732103 India Saveetha Engineering College Saveetha Nagar Thandalam Chennai602105 India

This article introduces a planar monopole antenna specially designed for NB-IoT module devices. The preferred choice for Internet of Things (IoT) technology is the Narrow-Band Internet of Things (NB-IoT) due to its extensive coverage and low power consumption. NB-IoT is specifically designed for IoT applications. A circular patch antenna with dimensions of 30 mm × 60 mm is fabricated, which is specifically tailored for the NB-IoT module. The antenna dimensions are meticulously chosen to ensure compatibility with the device module, considering the NB-IoT B1 (2100) and B3 (1800) frequency bands. Among various patch shapes, the circular design is preferred for its advantages over hexagon and square patches. The desired antenna configuration combines a square-slotted patch with a monopole ground plane, and it offers several advantages in terms of design simplicity, compact size, and characteristics such as broad bandwidth, acceptable gain, and high radiation efficiency. The design process employs HFSS Software and utilizes an FR4 substrate of 1.6 mm thickness. Operating at resonance frequencies of 2.1 GHz and 1.8 GHz, the antenna covers a broad frequency spectrum of 1100 MHz (1.5 to 2.6 GHz) with a fractional bandwidth of 53.65%. The suggested antenna achieves a peak gain of 3.3 dB and maximum radiation efficiency of 96% within its operating band. It exhibits an omnidirectional radiation pattern, meeting the specific requirements of NB-IoT technologies. Experimental measurements of the fabricated antenna validate the results achieved from the simulated data. © 2023, Electromagnetics Academy. All rights reserved.

关键词： Internet of things

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Thermal Simulation for Magnetic Coupler of Wireless Power Transfer Electric Vehicles by Using Heat Sink and Thermoelectric Cooler

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Progress In Electromagnetics Research M 2024年 126卷 89-98页

作者： Farooq, Umar Shafique, Shahryar Asif, Muhammad Arslan, Muhammad Wongjom, Poramed Ullah, Rizwan Zhilenkov, Anton Mobayen, Saleh Pijitrojana, Wanchai Electrical and Computer Engineering Department Thammasat School of Engineering Thammasat University Rangsit Campus Klong Luang Pathum Thani 12120 Thailand Ministry of IT & Telecommunications Islamabad Pakistan Department of Electrical Engineering University of Science and Technology Main Campus Bannu23200 Pakistan Department of Mechanical Engineering University of Engineering and Technology Lahore Pakistan Division of Physics Faculty of Science and Technology Thammasat University Rangsit Campus Klongluang Pathum Thani 12120 Thailand Department of Electrical Engineering Chulalongkorn University Bangkok10330 Thailand Department of Cyber-Physical Systems St. Petersburg State Marine Technical University Saint-Petersburg190121 Russia Graduate School of Intelligent Data Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou640301 Taiwan

In challenging operational environments such as underground buildings beneath roadways, reliability and performance of wireless power transfer (WPT) systems for electric vehicles (EVs) heavily hinge on the operating temperature of the magnetic couplers. Addressing this, this study introduces a novel approach employing heat sink and thermoelectric cooler technologies to mitigate temperature rise in magnetic couplers, which is particularly crucial for high-power applications. Utilizing ANSYS simulation, the study evaluates a WPT high-power application coil model with a total output power of 2 KW and an 18 cm air gap, with a 3.5 cm adjacent alignment to enhance thermal performance on both transmitter and receiver sides. Results demonstrate significant thermal enhancement, reducing the temperature of coils from 63◦ C to 54◦ C solely with the heat sink and further down to 48◦ C with the combined implementation of both heat sink and thermoelectric cooler. These measures effectively dissipate heat from the coils into the surrounding air, ensuring system efficiency and stability while facilitating functionality of system components. © 2024, Electromagnetics Academy. All rights reserved.

关键词： Heat sinks

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Reviewing metal supported solid oxide fuel cells for efficient electricity generation with biofuels for mobility

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Journal of Energy Chemistry 2025年第4期103卷 106-153页

作者： Fábio C.Antunes João P.J.de Oliveira Ricardo S.de Abreu Thiago Dias Bruno B.N.S.Brandão Josué M.Gonçalves Josimar Ribeiro Julian Hunt Hudson Zanin Gustavo Doubek School of Electrical and Computer Engineering University of CampinasCampinas 13083-852Brazil School of Food Engineering University of CampinasCampinas 13083-852Brazil School of Chemical Engineering University of CampinasCampinas 13083-852Brazil Mackenzie Institute for Research in Graphene and Nanotechnologies(MackGraphe) Mackenzie Presbyterian InstituteSão Paulo 01302-907Brazil Electrochemistry Research and Development Laboratory(LPDE) Department of ChemistryCenter of Exact SciencesFederal University of Espírito SantoCampus GoiabeirasVitória 29075-910Brazil Biological and Environmental Science and Engineering Division King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia

Metal-Supported Solid Oxide Fuel Cells(MS-SOFCs)hold significant potential for driving the energy *** electrochemical devices represent the most advanced generation of Solid Oxide Fuel Cell(SOFCs)and can pave the way for mass production and wider adoption than Proton Exchange Membrane Fuel Cells(PEMFCs)due to their fuel flexibility,higher power density and the absence of noble metals in the fabrication *** review examines the state-of-the-art of SOFCs and MS-SOFCs,presenting perspectives and research directions for these key technological devices,highlighting novel materials,techniques,architectures,devices,and degradation mechanisms to address current challenges and future *** such as infiltration/impregnation,ex-solution catalyst synthesis,and the use of a pre-catalytic reformer layer are discussed as their impact on efficiency and prolonged *** concepts are also described and connected with well-dispersed nano particles,hindrance of coarsening,and an increased number of Triple Phase Boundaries(TPBs).This review also describes the synergistic use of reformers with MS-SOFCs to compose solutions in energy generation from readily available ***,the End-of-Life(EoL),recycling,and life-cycle assessments(LCAs)of the Fuel Cell Hybrid Electric Vehicles(FCHEVs)were *** comparing Fuel Cell Electric Vehicles(FCEVs)equipped with(PEMFCs)and FCHEVs equipped with MS-SOFCs,both powered with hydrogen(H_(2))generated by different routes were *** review aims to provide valuable insights into these key technological devices,emphasizing the importance of robust research and development to enhance performance and lifespan while reducing costs and environmental impact.

关键词： Reform Metal-supported solid oxide fuel cell Powertrain systems Fuel cell Hybrid electric vehicle Biofuel

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Spacecraft potential effects on low-energy ion measurements to be made by probe B1 of Comet Interceptor

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RAS Techniques and Instruments 2024年第1期3卷 333-346页

作者： Bergman, S. Kasahara, S. Stenberg Wieser, G. Division of Space and Plasma Physics School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Department of Earth and Planetary Science Graduate School of Science The University of Tokyo Swedish Institute of Space Physics

Spacecraft charging causes notorious issues for low-energy plasma measurements. The charged particles are accelerated towards or repelled from the spacecraft surface, affecting both their energy and travel direction. The latter results in a distortion of the effective field of view (FOV) of the instrument making the measurements. The Comet Interceptor mission, planned to be launched in 2029, will make a flyby of a long-period or interstellar comet that ideally is dynamically new. The mission comprises one main spacecraft A, developed by the European Space Agency (ESA), and two sub-probes B1 and B2, developed by the Japan Aerospace Exploration Agency and ESA, respectively. The low-energy plasma measurements made by Comet Interceptor will likely be affected by the spacecraft potential in the case of low relative flyby velocities. On probe B1, the Cometary Ion Mass Spectrometer (CIMS) of the Plasma Suite is an ion mass spectrometer, capable of measuring ions with energies down to 10 eV/q. In this work, we use the Spacecraft Plasma Interaction Software to study the influence of the spacecraft potential on the low-energy ion measurements to be made by CIMS in the inner cometary magnetosphere. The results show that the effective FOV of CIMS is distorted at low energies when the flyby velocity is low. The distortion level is highly geometry dependent, and the largest distortions are caused by the magnetometer boom. Furthermore, the results show that cold ions with bulk velocities in the range 1-10 km s-1, flowing both radially away from and inward towards the nucleus, are detectable by the instrument considering the nominal observation geometry. © 2024 The Author(s).

关键词： Comets Data Methods Instrumentation Numerical Methods Plasma SPIS

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Data-Driven Assessment of Operational and Harsh Environmental Stress Factors for Solar Inverters Using Field Measurements

Data-Driven Assessment of Operational and Harsh Environmenta...

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2024 IEEE Power and Energy Society General Meeting, PESGM 2024

作者： Luo, Yi Liu, Liming Yuan, Yuxuan Wang, Zhaoyu Qiu, Feng Zhao, Shijia Yildirim, Murat Iowa State University Electrical and Computer Engineering AmesIA United States Energy Systems Division Argonne National Laboratory LemontIL United States Wayne State University Industrial and Systems Engineering DetroitMI United States

The operation of inverters in distributed photovoltaic (PV) systems within distribution systems is critical for ensuring the reliability and durability of the PV system, particularly when challenged by diverse operational and environmental stress conditions. This study delves into analyzing the inverter stress factors to assess the impact of under-sizing and varying environmental stresses on the reliability and service life of PV inverters. A new operational stress metric, equivalent under-sizing rate (EUR), is proposed to quantify the actual inverter stress from the under-sizing problem. Along with the designed weather and extreme event metrics, the proposed EUR is evaluated in a real-world PV inverter dataset. To handle the censored working time variable, the Cox proportional hazards model is adopted to conduct the data-driven stress factor analysis. The regression results reveal aside from the high temperature and large temperature variance, the inverter under-sizing problem is also a significant factor that could influence the lifetime of inverters. Meanwhile, further applications and potential future directions for the proposed work are explored. © 2024 IEEE.

关键词： Photovoltaics

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