Article
Engineering, Electrical & Electronic
Pipat Prommee, Peradol Pienpichayapong, Narongsak Manositthichai, Natapong Wongprommoon
Summary: This research presents a method to realize fractional-order devices or constant phase element (CPE) using continued fraction expansion and rational function approximation methods. The proposed CPE can function as fractional-order capacitor and inductor, with independently tunable impedance and operation frequency. The validation of the proposed fractional-order device on electrical Cole models of skull tissues shows comparable characteristics to the theoretical models.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Zhile Lin, Liangzong He, Hongyan Zhou
Summary: This article proposes an adaptive fractional-order capacitor based method to address the harmonic issue in microgrid systems. The method compensates the required impedance by modulating the order of the capacitor, uses a capacitor as power storage, and employs non-dissipative components. A parallel double closed-loop control is used to stabilize the internal energy of the circuit and ensure accurate port current.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Green & Sustainable Science & Technology
V. Uma Shankar, P. Senthil Kumar, D. Govindarajan, P. Nethaji, G. Bharath Balji
Summary: A high-performance symmetric electrochemical capacitor based on ruthenium dioxide anchored on reduced graphene oxide nanostructures was developed and tested in Na2SO4 aqueous electrolyte. The rGO/RuO2 electrode showed a high cyclic efficiency of 96%, considerably higher than pure RuO2.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Electrical & Electronic
Chunling Hao, Faqiang Wang
Summary: This paper investigates a new implementation of a passive fractional-order capacitor (FOC) using a single-component fractional-order inductor (FOI). The approach provides a more accurate and realistic representation of the fractional-order impedance characteristic by avoiding the approximation of the integer-order transfer function. The paper also presents the realizable conditions of the passive FOC and analyzes the sensitivity of the impedance on component parameters, facilitating the design of the FOC emulator. The proposed method shows improved accuracy and the effectiveness is validated through simulations and experiments.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Li Zhang, Aslihan Kartci, Hakan Bagci, Khaled N. Salama
Summary: Interest in fractional-order inductors (FOIs) has recently increased due to their ability to design accurate and robust models of dynamical systems. This work proposes a simple-to-realize FOI design with variable constant phase angle (CPA) to address the challenge of practical implementation.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
David Kubanek, Jaroslav Koton, Jan Dvorak, Norbert Herencsar, Roman Sotner
Summary: This paper presents a detailed analysis of an operational transconductance amplifier based gyrator implementing a fractional-order inductance simulator. The influence of active element non-ideal properties on the gyrator operation is investigated, and recommendations to optimize the performance of the gyrator are proposed. The theoretical observations are verified through PSpice simulations.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
A. M. AbdelAty, Mohammed E. Fouda, Menna T. M. M. Elbarawy, A. G. Radwan
Summary: This study aims to find approximate solutions of the most energy-efficient input charging function in fractional-order RC circuits using the Cuckoo search optimizer. The results show that the charging time and resistive parameters have the most dominant effect on charging efficiency at constant fractional-order a.
JOURNAL OF ADVANCED RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Stavroula Kapoulea, Costas Psychalinos, Ahmed S. Elwakil
Summary: This paper introduces a novel circuit implementation method for the driving-point impedance of frequency-domain material models, where direct emulation of the complete model is achieved through the approximation of the total impedance function, leading to a significant reduction in the count of passive and/or active components.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Jingyu Zhang, Liangzong He, Zhile Lin
Summary: This article proposes a second harmonic current suppression method based on fractional-order capacitor (FOC), which does not require power supply and incurs little loss. The proposed method can achieve SHC suppression with the advantages of a simple control strategy, hot-swappable, and high flexibility. Most importantly, it can effectively suppress the first-order harmonic current caused by the asymmetrical parameters of the capacitors.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Energy & Fuels
Homayoun Kord, Abbas-Ali Zamani, S. Masoud Barakati
Summary: This paper presents a filtration-based fractional-order PI (FOPI) controller optimized by Gases Brownian Motion Optimization (GBMO) algorithm to manage an active battery-supercapacitor hybrid energy storage system (HESS) in a wind-dominated remote area power supply (RAPS) system. The proposed controller can smooth inherent voltage and power fluctuations of standalone systems and improve system performance by coordinating different components.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Computer Science, Information Systems
Li Zhang, Aslihan Kartci, Ahmed Elwakil, Hakan Bagci, Khaled N. Salama
Summary: Fractional calculus is powerful for modeling complex systems with memory effects. The lack of robust fractional-order energy storage devices, particularly FOIs, hinders the realization of fractional systems. A straightforward approach using a coaxial structure to realize FOIs is proposed in this work, and experimental results show stable response with half-order inductive behavior. The effects of device geometry and filling material properties on device response are also investigated.
Article
Automation & Control Systems
Hongyan Zhou, Liangzong He, Zelong Yang, Zhile Lin
Summary: In this article, a virtual fractional-order inductor (FOI) based control method is proposed to reduce the second harmonic current (SHC) and improve the dynamic performance of the system. The order and magnitude of the fractional-order inductor can be modified arbitrarily, and a negative order inductor is constructed to enhance system stability. The effectiveness of the proposed control method is verified through the fabrication and testing of an 800-W two-stage single-phase inverter.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Anis Allagui, Ahmed S. Elwakil
Summary: This study demonstrates that the discharge voltage pattern of a supercapacitor with fractional-order behavior is influenced by the past charging voltage profile. By utilizing the history-dependence of the device's dynamic behavior, information pre-coded in the charging waveform pattern can be uniquely retrieved, with an analytical model based on fractional calculus explaining the information storage mechanism. The intrinsic material memory effect could potentially lead to new methods for information storage and retrieval.
SCIENTIFIC REPORTS
(2021)
Article
Mathematics, Applied
Jorge M. Cruz-Duarte, Manuel Guia-Calderon, J. Juan Rosales-Garcia, Rodrigo Correa
Summary: The study showed that the behavior of Electrolytic computer-grade capacitors (ECGCs) should not be assumed to be equivalent to supercapacitors. By utilizing models derived from fractional differential equations (FDEs) and suitable solving algorithms, a more accurate description of the discharge process of ECGCs can be achieved.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Chemistry, Analytical
Sujitha Vejella, Sazzadur Chowdhury
Summary: The MEMS ultra-wideband RMS power sensor utilizes microfabricated components to generate a frequency-independent voltage for power sensing, making it suitable for various applications.
Article
Engineering, Electrical & Electronic
Anis Allagui, Ahmed S. Elwakil, Chunlei Wang
Summary: This paper aims to demonstrate the four possible mapping functions for voltage or charge inputs and their corresponding time-domain or frequency-domain electrical charge outputs when a capacitive device is voltage-charged. Similarly, there are four more possible combinations when the device is current-charged. The dual relationship between each pair of functions is established using single or double Fourier transforms. All eight system functions align only if a constant time- and frequency-independent capacitance is assumed.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Electrochemistry
Abdulwadood Al-Ali, Ahmed S. Elwakil, Brent Maundy, Sohaib Majzoub, Anis Allagui
Summary: Electrochemical Impedance Spectroscopy (EIS) is an important diagnostic and monitoring tool in various industries. However, using the conventional frequency-sweep method for EIS in low and ultra low sub-Hz frequencies results in long measurement time. To overcome this issue, a wide-band signal covering the entire frequency range of interest is proposed and validated in this study using the Rudin-Shapiro polynomial. The signal was applied to an RC circuit and compared with the classical frequency-sweep method for verification, and then used for measuring strawberry bio-impedance for age monitoring applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Neurosciences
Wenzhe Guo, Mohammed E. Fouda, Ahmed M. Eltawil, Khaled Nabil Salama
Summary: This study proposes an efficient and direct training algorithm for SNNs that integrates a locally-supervised training method with a temporally-truncated BPTT algorithm, reducing computational cost significantly. The results show that this method has the potential for fast and energy-efficient on-chip training for real-time learning at the edge.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Computer Science, Information Systems
Shahenda M. Abdelhafiz, Mohammed E. Fouda, Ahmed G. Radwan
Summary: Lithium-ion batteries play a crucial role in many applications, and therefore, modeling their behavior is necessary in various fields. This paper proposes seven dynamic models to simulate the discharging behavior of lithium-ion batteries, and their efficacy in fitting different time-domain responses is tested through parameter identification. The results show that these models have an average absolute normalized error as low as 0.0057.
Article
Engineering, Electrical & Electronic
Anis Allagui, Di Zhang, Ahmed Elwakil
Summary: This study provides experimental evidence supporting Westerlund's conjecture that Dead Matter Has Memory (Westerlund, 1991). Recent studies have observed and reported memory effects in the dynamic response of electric double-layer capacitors (EDLCs), which integrate their prior history of stimulation and state. Different excitation signals were used to quantify these effects, aiming to charge the same device to the same voltage and accumulated charge level but in different ways. It was observed that different yet repeatable discharge patterns occur, proving the existence of memory. This brief aims to provide further experimental evidence of the inherent memory effect in EDLCs in response to time-varying stationary input excitations with different statistical properties.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Ahmed S. Elwakil, Anis Allagui, Costas Psychalinos, Brent J. Maundy
Summary: We propose a new class of nonlinear resonance networks modeled by second-order nonlinear differential equations. By modifying traditional RLC resonance networks and introducing a variable resistor controlled by one of the circuit's state-space variables, we achieve an embedded self-feedback control mechanism. An experimental verification of the modified series resonance circuit's filter response behavior is also presented.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Chemistry, Analytical
Anis Allagui, Mohammed E. Fouda, Ahmed S. Elwakil, Costas Psychalinos
Summary: This study demonstrates a method to accurately estimate the time-domain power and energy of supercapacitors in response to excitation signals, using only the frequency-domain impedance parameters of the device. The results from simulations and experiments show the feasibility and potential of the proposed procedure.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Electrochemistry
Anis Allagui, Osama Awadallah, Bilal El-Zahab, Chunlei Wang
Summary: By examining the frequency-domain response of battery signals, the cyclical performance of batteries can be evaluated. In this study, the short-time Fourier transform is used to deconstruct the charge/discharge signals of lithium-sulfur batteries, allowing the detection of critical changes and potential faults.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Computer Science, Information Systems
Mariam Rakka, Mohammed E. Fouda, Rouwaida Kanj, Fadi Kurdahi
Summary: This article proposes a content-addressable memory compiler for decision tree inference acceleration, and investigates the accuracy of decision tree under hardware non-idealities. Experimental results show significant improvements in energy consumption, latency, and accuracy with this framework.
IEEE TRANSACTIONS ON EMERGING TOPICS IN COMPUTING
(2023)
Article
Computer Science, Information Systems
Alexandros Pagidas, Costas Psychalinos, Ahmed S. Elwakil
Summary: The frequency behavior of fractional-order, power-law, and double-order filters can be approximated by the same rational integer-order transfer function through curve fitting. Additionally, their implementation can be achieved by the same core with changes in time constants and scaling factors. These findings are experimentally verified using a Field Programmable Analog Array device.
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
