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13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Farrok, Omar Kiran, Mahbubur Rahman Islam, Md. Rabiul Xu, Wei Department of Electrical and Electronic Engineering Ahsanullah University of Science and Technology Tejgaon I/A Dhaka1208 Bangladesh Department of Electrical and Electronic Engineering Green University of Bangladesh Dhaka Bangladesh School of Electrical Computer and Telecommunications Engineering Faculty of Engineering and Information Sciences University of Wollongong NSW2522 Australia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728172101

electrical power generation from the oceanic wave is one of the noteworthy footsteps in the field of renewable energy resource based energy conversion system. There are different technologies regarding electricity generation by using linear electrical generators along with the wave energy devices. This paper presents various control technologies of the linear generator that are widely been used for harvesting oceanic wave energy. Several controllers are discussed that are used to control the voltage, current, and power flow of the linear generator. Mathematical models of different controllers are discussed. Connection of the controller with the linear generator, input, output, outcome, and method of the controller with their pros and cons are presented as well. In addition, testing devices and their controls for the linear generator are presented with their schematic diagram. This paper would play vital role to the researcher for the future development of the linear generator for oceanic wave energy conversion. © 2021 IEEE

关键词： Controllers

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Reconfigurable microwave device based on self-rolling interdigital microactuator

Reconfigurable microwave device based on self-rolling interd...

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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Siqi Wang Zhikun Zhou Kang Wang Zhendong Yang Tao Yuan Lei Ma Boxing Zhou Lei Sang Wei He Wen Huang Department of Electronic Science Hefei University of Technology Hefei China Department of Electrical and Computer Engineering Microelectronics Research Center The University of Texas at Austin Austin USA Kunshan Innowave Communication Technology Co. Ltd Kunshan China Cenre Microelectronics (Kunshan) Co. Ltd Kunshan China China Academy of Information and Communications Technology Beijing China

A two-in-one function reconfigurable microwave passive device is designed which can be functionally reconfigured to operate either as an inductor, or a coplanar waveguide (CPW) delay line. Reconfiguration is guided by interdigital microactuators which are fabricated by self-rolled-up membrane (S-RuM) nanotechnology and controlled by sequential direct-current (DC) voltage. The simulated result shown that inductance is as large as 21 nH and Q factor is 5.4 at 1 GHz, maximum working frequency is 1.5 GHz; the delay line achieves a delay of 1450 ps and an insertion loss about 1.0 dB at 1 GHz. Suitable for multi-function microwave circuits.

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Sensing-Communication-Computing-Control Closed-Loop Optimization for 6G Unmanned Robotic Systems

arXiv

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arXiv 2024年

作者： Fang, Xinran Lei, Chengleyang Feng, Wei Chen, Yunfei Xiao, Ming Ge, Ning Wang, Cheng-Xiang State Key Laboratory of Space Network and Communications Department of Electronic Engineering Tsinghua University Beijing100084 China Department of Engineering University of Durham DurhamDH1 3LE United Kingdom Department of Information Science and Engineering School of Electrical Engineering and Computer Science Royal Institute of Technology Sweden National Mobile Communications Research Laboratory School of Information Science and Engineering Southeast University Nanjing210096 China Purple Mountain Laboratories Nanjing211111 China

Rapid advancements in field robots have brought a new kind of cyber physical system (CPS)-unmanned robotic system-under the spotlight. In the upcoming sixth-generation (6G) era, these systems hold great potential to replace humans in hazardous tasks. This paper investigates an unmanned robotic system comprising a multi-functional unmanned aerial vehicle (UAV), sensors, and actuators. The UAV carries communication and computing modules, acting as an edge information hub (EIH) that transfers and processes information. During the task execution, the EIH gathers sensing data, calculates control commands, and transmits commands to actuators-leading to reflex-arc-like sensing-communication-computing-control (SC3) loops. Unlike existing studies that design SC3loop components separately, we take each SC3loop as an integrated structure and propose a goal-oriented closed-loop optimization scheme. This scheme jointly optimizes uplink and downlink (UL&DL) communication and computing within and across the SC3loops to minimize the total linear quadratic regulator (LQR) cost. We derive optimal closed-form solutions for intra-loop allocation and propose an efficient iterative algorithm for inter-loop optimization. Under the condition of adequate CPU frequency availability, we derive an approximate closed-form solution for inter-loop bandwidth allocation. Simulation results demonstrate that the proposed scheme achieves a two-tier task-level balance within and across SC3loops. © 2024, CC0.

关键词： Unmanned aerial vehicles (UAV)

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Millimeter Wave Full-Duplex Networks: MAC Design and Throughput Optimization

Millimeter Wave Full-Duplex Networks: MAC Design and Through...

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Biennial Symposium on Communications, QBSC

作者： Shengbo Liu Wen Wu Liqun Fu Kaige Qu Qiang Ye Weihua Zhuang Sherman Shen Frontier Research Center Peng Cheng Laboratory Shenzhen China School of Informatics Xiamen University Xiamen China Department of Electrical and Computer Engineering University of Waterloo Waterloo Canada Department of Computer Science Memorial University of Newfoundland St. John's Canada

Full-duplex (FD) technique can remarkably boost the network capacity in the millimeter wave (mmWave) bands by enabling simultaneous transmission and reception. However, due to directional transmission and large bandwidth, the throughput and fairness performance of a mm Wave FD network are affected by deafness and directional hidden-node (HN) problems and severe residual self-interference (RSI). To address these challenges, this paper proposes a directional FD medium access control protocol, named DFDMAC to support typical directional FD transmission modes by exploiting FD to transmit control frames to reduce signaling overhead. Furthermore, a novel busy-tone mechanism is designed to avoid deafness and directional HN problems and improve fairness of channel access. To reduce the impact of RSI on link throughput, we formulate a throughput maximization problem for different FD transmission modes and propose a power control algorithm to obtain the optimal transmit power. Simulation results show that the proposed DFDMAC can improve the network throughput and fairness by over 60% and 32%, respectively, compared with the existing MAC protocol in IEEE 802.11ay. Moreover, the proposed power control algorithm can effectively enhance the network throughput.

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A Switch Architecture for Time-Triggered Transmission with Best-Effort Delivery

arXiv

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arXiv 2023年

作者： Li, Zonghui Zhu, Wenlin Shin, Kang G. Wan, Hai Song, Xiaoyu Yang, Dong Ai, Bo The Beijing Key Laboratory of Transportation Data Analysis and Mining School of Computer and Information Technology Beijing Jiaotong University Beijing100044 China The Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109-2121 United States The Software School Tsinghua University Beijing100084 China The Department of Electrical and Computer Engineering Portland State University PortlandOR United States The School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China

In Time-Triggered (TT) or time-sensitive networks, the transmission of a TT frame is required to be scheduled at a precise time instant for industrial distributed real-time control systems. Other (or best-effort (BE)) frames are forwarded in a BE manner. Under this scheduling strategy, the transmission of a TT frame must wait until its scheduled instant even if it could have been transmitted sooner. On the other hand, BE frames are transmitted whenever possible but may miss deadlines or may even be dropped due to congestion. As a result, TT transmission and BE delivery are incompatible with each other. To remedy this incompatibility, we propose a synergistic switch architecture (SWA) for TT transmission with BE delivery to dynamically improve the end-to-end (e2e) latency of TT frames by opportunistically exploiting BE delivery. Given a TT frame, the SWA generates and transmits a cloned copy with BE delivery. The first frame arriving at the receiver device is delivered with a configured jitter and the other copy ignored. So, the SWA achieves shorter latency and controllable jitter, the best of both worlds. We have implemented SWA using FPGAs in an industry-strength TT switches and used four test scenarios to demonstrate SWA's improvements of e2e latency and controllable jitter over the state-of-the-art TT transmission scheme. Copyright © 2023, The Authors. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

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A critical review on recent progress of solution-processed monolayer assembly of nanomaterials and applications

arXiv

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arXiv 2024年

作者： Zhao, Liang Fan, Jichao Gong, Chenchi Dyke, Alexis Gao, Weilu Li, Bo Department of Mechanical Engineering Hybrid Nano-Architectures and Advanced Manufacturing Laboratory Villanova University 800 E. Lancaster Ave. VillanovaPA19085 United States Department of Electrical and Computer Engineering The University of Utah 201 Presidents' Cir Salt Lake CityUT84112 United States

The rapid development in nanotechnology has necessitated accurate and efficient assembly strategies for nanomaterials. Monolayer assembly of nanomaterials (MAN) represents an extreme challenge in manufacturing and is critical in understanding interactions among nanomaterials, solvents, and substrates. MAN enables highly tunable performance in electronic and photonic devices. This review summarizes the recent progress on the methods to achieve MAN and discusses important control factors. Moreover, the importance of MAN is elaborated by a broad range of applications in electronics and photonics. In the end, we outlook the opportunities as well as challenges in manufacturing and new applications. © 2024, CC BY.

关键词： Substrates

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Implementational Aspects for the Characterization of Low-Inertia in Power Systems

Implementational Aspects for the Characterization of Low-Ine...

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Annual North-American Power Symposium

作者： M. D. Baquedano-Aguilar Nader Aljohani Sean P. Meyn Arturo Bretas Department of Electrical & Computer Engineering University of Florida Gainesville Florida Pacific Northwest National Laboratory Distributed Systems Group Richland WA

ISBN: (纸本)9781665499224

The replacement of conventional generating units with non-conventional renewable energy resources impacts the reliability of power systems. With high integration of renewable-based generation resources, there is a reduction in total system inertia, which could lead to systems with less time to react for frequency restoration in case of unexpected unit failures. Though several power system testbeds are available for studying and analysing different stability phenomena, none are suitable for characterizing, or analyzing low-inertia conditions. In this paper, a power system simulation environment is introduced for investigating control architectures for power grids, with special attention to the impact of high penetration of inverter-based generation resources (IBRs). The testbed is applied to the WSCC 9- bus test system, modified so that a range of IBR penetration levels can be analyzed (from zero to 80%). The testbed is suitable for studying both fast and slow electromechanical phenomena. A conclusion from numerical experiments is that high levels of IBRs do not necessarily result in low-inertia. This is due in part to the layers of control in the grid already in place to avoid frequency excursions.

关键词： Renewable energy sources Time-frequency analysis System dynamics Simulation Power system stability Power grids Stability analysis

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Effect of output coupling ratio on performance of Q-switched fiber laser based on MgQ2 organic saturable absorber

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Optical Fiber Technology 2025年 93卷

作者： Najm, Mustafa Mohammed Najm, Sarah Mohammed Hmood, Jassim K. Yit, Jing Ee Al-Azzawi, Alabbas A. Abdullah, Mohammed Najm Harun, S.W. Photonics Engineering Laboratory Department of Electrical Engineering Faculty of Engineering Universiti Malaya Kuala Lumpur50603 Malaysia Technical Instructors Training Institute Middle Technical University Baghdad10074 Iraq Department of Computer Engineering University of Technology Baghdad10066 Iraq Optoelectronics Engineering Department College of Laser and Optoelectronics Engineering University of Technology Baghdad10066 Iraq Department of Mechanical Engineering Faculty of Engineering Universiti Teknologi Petronas 32610 Seri Iskandar Perak Malaysia Research and Development Directorate Ministry of Higher Education and Scientific Research Baghdad10065 Iraq Department of Medical Instrumentation Technical College of Medical Technical Al-Farahidi University Baghdad Iraq

This study experimentally investigates an organic 8-Hydroxyquinoline magnesium (MgQ2) thin-film saturable absorber (SA). The MgQ2-SA is prepared using the drop-casting method to create a solid polymer film. The results show that the optical properties of the MgQ2-SA film include a non-saturable absorption of 30 %, a saturable absorption of 22.5 %, and a saturable intensity of 11.4 MW/cm2. The Q-switched operation using MgQ2-SA film produces pulse widths ranging from 7.45 µs to 1.4 µs, with pulse repetition rates reported from 32 to 135 kHz, particularly in the coupling ratio range of 50 % to 10 %. Q-switched spectral operations were observed at wavelengths of 1530 nm for 10:90 output coupler (OC). Besides, for 50:50 OC, dual-wavelength spectrum is recorded with peaks at 1557 nm, and 1559 nm wavelengths. The proposed system architecture shows the capability to generate unique pulse characteristics across various wavelengths and different coupling ratios. © 2025

关键词： Nonlinear optics

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High-Sensitivity Photoacoustic Gas Sensor With Ultrawide Dynamic Range Using Active Frequency Tracking Technology

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Li, Yafei Guan, Gangyun Yang, Shuo Deng, Zhuobei Jiang, Yanyu Deng, Wanling Huang, Junkai Wang, Xicheng Xue, Xiaobin Han, Xile Zheng, Chuantao Guo, Tuan Tittel, Frank K. Jinan University College of Information Science and Technology Department of Electronic Engineering Guangzhou510630 China Jilin University State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Changchun130012 China Jinan University Institute of Photonics Technology College of Physics and Optoelectronic Engineering Guangzhou511443 China Rice University Department of Electrical and Computer Engineering HoustonTX77005 United States

To achieve highly sensitive and ultrawide dynamic range gas detection, a dual-mode gas sensor was proposed using cavity-enhanced photoacoustic spectroscopy (CEPAS) and active resonant frequency tracking (ARFT) technology. CEPA cell with double resonance of optical and acoustic can greatly enhance the detection sensitivity of the sensor. Moreover, a new sensing mechanism based on the relationship between gas concentration and acoustic resonant frequency was studied. As an example, we developed an acetylene (C2H2) sensor, achieving a normalized noise equivalent absorption (NNEA) coefficient of 9:86 × 10-11 cm-1 W Hz-1/2 and an unprecedented dynamic range of nearly nine orders of magnitude (10-3 - 106 ppm). This new measurement tool will provide crucial additional capabilities to gas monitoring with improved sensitivity and dynamic range. © 2025 IEEE.

关键词： Gas detectors

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Controlled Growth of High-Quality Β-Ag2se Nanowires and Their Applications in Near-Infrared Photodetection

SSRN

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SSRN 2024年

作者： Lei, Wen Luo, Huijia Wang, Han Zhang, Songqing Liu, Junliang Ren, Yongling Yuan, Cailei Department of Electrical Electronic and Computer Engineering The University of Western Australia 35 Stirling Highway Crawley6009 Australia Department of Electronic Engineering School of IOT engineering Jiangnan University Wuxi214122 China Jiangxi Key Laboratory of Nanomaterials and Sensors School of Physics Communication and Electronics Jiangxi Normal University 99 Ziyang Avenue Nanchang330022 China

This work reports the controlled growth of single-crystalline β-Ag2Se nanowires and their application in near-infrared photodetection. High-quality Ag2Se nanowires with an orthorhombic crystal structure are grown via the chemical vapor deposition method with a length up to 32.8 [[EQUATION]] and a diameter down to 52.1 nm. By fine-tuning the growth parameters such as total tube inner pressure and precursor temperature, the length of Ag2Se nanowires can be precisely controlled. A dynamic growth model is also introduced to interpret the growth mechanism of Ag2Se nanowires. Two-terminal photodetectors based on single Ag2Se nanowire are fabricated and show competitive photodetection performance compared to that of other silver chalcogenide nanomaterial-based photodetectors. At room temperature, the fabricated Ag2Se nanowire-based photodetector exhibits a broadband response range of 400 - 1064 nm at a bias voltage of 2 V, while the peak photo-response performance is obtained in the near-infrared region. Under 830 nm light illumination, the maximum responsivity, specific detectivity, rise time and decay time are measured and calculated to be 99.6 mA/W and 2.56 × 108 Jones, 23.84 ms and 47.6 ms, respectively, demonstrating its great potential in uncooled near-infrared photodetector applications. © 2024, The Authors. All rights reserved.

关键词： Nanowires

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