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Transition metal anchored on C_(9)N_(4) as a single-atom catalyst for CO_(2) hydrogenation: A first-principles study

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Chinese Physics B 2022年第10期31卷 520-528页

作者： Jia-Liang Chen Hui-Jia Hu Shi-Hao Wei Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China Department of Electronic and Information Engineering School of Electrical Engineering and Computer ScienceNingbo UniversityNingbo 315211China

To alleviate the greenhouse effect and maintain the sustainable development, it is of great significance to find an efficient and low-cost catalyst to reduce carbon dioxide(CO_(2)) and generate formic acid(FA). In this work, based on the first-principles calculation, the catalytic performance of a single transition metal(TM)(TM = Cr, Mn, Fe, Co, Ni, Cu, Zn,Ru, Rh, Pd, Ag, Cd, Ir, Pt, Au, or Hg) atom anchored on C_(9)N_(4) monolayer(TM@C_(9)N_(4)) for the hydrogenation of CO_(2) to FA is calculated. The results show that single TM atom doping in C_(9)N_(4) can form a stable TM@C_(9)N_(4) structure, and Cu@C_(9)N_(4) and Co@C_(9)N_(4) show better catalytic performance in the process of CO_(2) hydrogenation to FA(the corresponding maximum energy barriers are 0.41 eV and 0.43 e V, respectively). The partial density of states(PDOS), projected crystal orbital Hamilton population(p COHP), difference charge density analysis and Bader charge analysis demonstrate that the TM atom plays an important role in the reaction. The strong interaction between the 3d orbitals of the TM atom and the non-bonding orbitals(1πg) of CO_(2) allows the reaction to proceed under mild conditions. In general, our results show that Cu@C_(9)N_(4) and Co@C_(9)N_(4) are a promising single-atom catalyst and can be used as the non-precious metals electrocatalyst for CO_(2) hydrogenation to formic acid.

关键词： first-principles calculation CO_(2)hydrogenation catalysts electronic structure reaction mechanisms reaction paths

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A 935-953-MHz Q-Enhanced CMOS Tunable Bandpass Filter With Ultra-Narrowband and Ultralow Power for RFID Applications

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IEEE Transactions on Microwave Theory and Techniques 2024年第10期72卷 6120-6129页

作者： Hou, Yaru Li, Kun Liu, Bin Zeng, Tiantian Liu, Yuanan Chi, Pei-Ling Yang, Tao University of Electronic Science and Technology of China School of Electronic Science and Engineering Chengdu Sichuan610054 China Beijing University of Posts and Telecommunications School of Electronic Engineering Beijing100876 China National Yang Ming Chiao Tung University Department of Electrical and Computer Engineering Hsinchu300 Taiwan

A Q-enhanced CMOS tunable bandpass filter (BPF) with ultra-narrow bandwidth and ultralow dc power consumption for radio frequency identification (RFID) devices is proposed using 55-nm bulk CMOS technology in this article. The proposed filter is constructed by a capacitively coupled LC resonator (LCC), which consists of a 16-nH on-chip integrated inductor, fixed capacitors, and tunable varactors. nMOS cross-coupled transistors are used to compensate for the loss of the resonator and improve the loaded Q of the resonator. To achieve low power consumption, an inductor with an ultralarge value is exploited to reduce the loss of the resonator. Besides, an improved dual varactor inverse (DVI) and degenerated resistors at the source of the cross-coupled transistors with linearity and resistance adjusting, respectively, are utilized to optimize the linearity under center frequency tuning. Besides, the active circuits, the fixed capacitance, and varactors are placed inside the inductor to improve the integration. With all the proposed techniques, the presented BPF achieves a 935-953-MHz center frequency tuning range with a constant narrow bandwidth of 180 kHz, a low power consumption of 85-μW , and a core area of 0.43\times0.43 mm2, demonstrating a high-performance tunable on-chip filter using bulk CMOS technology for low-power and narrowband internet of Things (NBIoT) applications. © 1963-2012 IEEE.

关键词： Bandpass filters

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HoloStream: a GPU-powered high-speed user interface for holographic microscopy imaging

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Optics Express 2025年第7期33卷 15648-15660页

作者： Morales, Johan Obando-Vásquez, Sofia Doblas, Ana Trujillo, Carlos Applied Optics Group School of Applied Science and Engineering EAFIT University Medellin Colombia Optical Imaging Research Lab Electrical and Computer Engineering Department University of Massachusetts Dartmouth DartmouthMA United States

This paper presents HoloStream, a GPU-powered high-speed user interface designed for holographic microscopy imaging. The platform reconstructs quantitative phase images rapidly for off-axis digital holographic microscopy (DHM) systems operating in the telecentric regime. By optimizing critical computational procedures, the HoloStream app reconstructs phase maps of 1280 × 960 pixels up to 11 frames per second (FPS) in live visualization and 90 fps for pre-recorded holographic videos. This real-time phase compensation is performed by upgrading the semi-heuristic phase compensation (SHPC) algorithm through GPU acceleration via PyCUDA. The interface also offers a user-friendly experience with flexible control over acquisition modes, visualization formats, and 3D tracking functionalities. Experimental validation demonstrates the platform’s capability to achieve fast and accurate phase imaging for live microscopy applications. The HoloStream app advances DHM technology by combining high-speed processing with ease of use, making it suitable for a wide range of DHM imaging applications. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： computer graphics equipment

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Finite-Time Synchronization of Complex Networks With intermittent Couplings and Neutral-Type Delays

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IEEE/CAA Journal of Automatica Sinica 2023年第10期10卷 2026-2028页

作者： Engang Tian Yi Zou Hongtian Chen School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China

Dear Editor, This letter focuses on the finite-time synchronization(FTS) of neutral-type complex networks with intermittent couplings. Different from most of the existing references concerning neutral-type systems,a delay-independent dynamical event-triggering controller is considered, operating the same way as the intermittent coupling and excluding the Zeno behavior naturally.

关键词： neutral letter concerning

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A critical review on techno-economic analysis of hybrid renewable energy resources-based microgrids

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Journal of engineering and Applied science 2023年第1期70卷 148页

作者： Manas, Munish Sharma, Shivi Reddy, K. Shashidhar Srivastava, Abhinav Department of Electrical Engineering School of Engineering and Technology Central University of Haryana Mahendragarh India Department of Computer Science and Engineering Jain University Bangalore India Department of Electrical and Electronics Engineering CVR College of Engineering Hyderabad India

Now that the population is growing, the expenditure on basic needs of life is also increasing due to a lack of or less availability of resources. The economy consumed electricity is reaching peaks as its main fuel, coal, is decreasing day by day. Due to this, 90% of the population who are in the middle class, lower middle class, or rural areas are economically poor and are unable to bear the prices. To overcome the financial problems, many researchers have prepared various types of microgrids that generate electricity from various types of flow resources, like hydro, solar, biogas, and air current power stations, whose system is called a compound flow power system. This paper gives a combined review of various research papers that discuss some case studies and some research on various models designed on software like HOMER Pro, how microgrids become economic barriers, optimal power supply solutions with CFPS, distributed and centralized microgrid components, the technical and economic feasibility of EV charging stations, and the analysis of various combinations of power systems at various locations like Bangladesh, Canada, the Republic of Djibouti, China, Indonesia, Sierra Leone, some rural sites in India, and some developing countries. This overview provides a glimpse into the various aspects of CFPS, including fusion approaches, techno-economic analysis, simulation platforms, storage technologies, design specifications, unit sizing methodologies, and control techniques. Further research and analysis in these areas are needed to explore their applications and advancements in CFPS development. The main reason for the study is to analyze and bring various ideas and models of various researchers together on a common platform and make a combined conceptual framework for further proceedings. © 2023, The Author(s).

关键词： Renewable energy resources

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Finite-region H∞ filtering of 2D Markov jump systems with deception attacks 24

Finite-region H∞ filtering of 2D Markov jump systems with d...

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2nd international Conference on Frontiers of Intelligent Manufacturing and Automation, CFIMA 2024

作者： Wang, Guangyu Fang, Jiankang Ren, Chengcheng Wang, Longlong He, Shuping Zhang, Liang School of Computer Science and Technology Anhui University Hefei China School of Electrical Engineering and Automation Anhui University Hefei China

ISBN: (纸本)9798400710681

In this paper, we study the finite-region H∞ filtering problem for two dimensional (2D) Markov jump systems (MJSs) subject to deception attacks. First, the effect of deception attacks are considered and the filtering error is modeled. The sufficient conditions to ensure the stability of the filtering performance are obtained by using the Lyapunov function and linear matrix inequalities. Finally, the effectiveness of the method is verified by a numerical example on Darboux equation. © 2024 Copyright held by the owner/author(s).

关键词： Lyapunov functions

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AggreMark: Efficient Watermarking in Federated Learning via Weighted Averaging 17

AggreMark: Efficient Watermarking in Federated Learning via ...

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IEEE Congress on Cybermatics: 17th IEEE international Conference on internet of Things, iThings 2024, 20th IEEE international Conference on Green Computing and Communications, GreenCom 2024, 17th IEEE international Conference on Cyber, Physical and Social Computing, CPSCom 2024, 10th IEEE international Conference on Smart Data, SmartData 2024

作者： Lian, Zhuotao Wang, Weiyu Su, Chunhua Sakurai, Kouichi Kyushu University Faculty of Information Science and Electrical Engineering Fukuoka Japan University of Aizu School of Computer Science and Engineering Aizuwakamatsu Japan

ISBN: (纸本)9798350351637

Federated learning has rapidly advanced as a privacy-preserving, distributed machine learning methodology. Protecting the intellectual property rights of federated models, however, poses significant challenges. Existing backdoor-based watermarking techniques suffer from complexity, inefficiency, and implementation challenges. In this paper, we present AggreMark, a novel watermarking approach that incorporates parallel server-side training and watermark embedding during the weighted averaging phase of federated learning. This method does not alter the original model structure or parameters related to the original learning task and adds no additional time overhead, ensuring its practicality for real-world applications. AggreMark is easy to implement and maintain, and it robustly preserves the model's high performance. We validate the method's effectiveness and robustness against pruning-based watermark removal attacks through experiments on CIFAR-10. © 2024 IEEE.

关键词： Federated learning

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Subwavelength 3D terahertz imaging with a single-pixel laser transceiver

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Optics Express 2025年第10期33卷 21938-21950页

作者： Silva, Jorge Plöschner, Martin Bertling, Karl Ghantala, Mukund Gillespie, Tim Torniainen, Jari Herbert, Jeremy Lim, Yah Leng Taimre, Thomas Qi, Xiaoqiong Donose, Bogdan C. Zhou, Tao Lui, Hoi-Shun Indjin, Dragan Han, Yingjun Li, Lianhe Valavanis, Alexander Linfield, Edmund H. Davies, A. Giles Dean, Paul Rakić, Aleksandar D. School of Electrical Engineering and Computer Science The University of Queensland BrisbaneQLD4072 Australia School of Mathematics and Physics The University of Queensland BrisbaneQLD4072 Australia School of Electronic and Electrical Engineering University of Leeds LeedsLS2 9JT United Kingdom

Terahertz imaging holds great potential for non-destructive material inspection, but practical implementation has been limited by resolution constraints. In this study, we present a single-pixel THz imaging system based on a confocal microscope architecture, utilizing a quantum cascade laser as both transmitter and phase-sensitive receiver. We demonstrate, for the first time to the best of our knowledge, that laser feedback interferometry-based imaging systems achieve enhanced lateral and axial resolution compared to conventional confocal imaging. Specifically, our approach yields a twofold improvement in lateral resolution, reaching λ/2, and a two-order-of-magnitude enhancement in axial resolution, from 25λ to beyond λ/5, through interferometric phase detection. The system can produce a 0.5 megapixel image in under three minutes, surpassing both raster-scanning single-pixel and multipixel focal-plane array-based imagers. Coherent operation enables simultaneous amplitude and phase image acquisition, and a custom visualization method links amplitude to image saturation and phase to hue, enhancing material characterization. A 3D tomographic analysis of a silicon chip reveals subwavelength features, demonstrating the system’s potential for high-resolution THz imaging and material analysis. This work overcomes the resolution limits of conventional lens-based imaging systems, by enabling rapid, high-fidelity imaging of subwavelength features beyond the diffraction limit. © 2025 Optica Publishing Group (formerly OSA). All rights reserved.

关键词： Confocal microscopy

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Design Method for Q-Enhanced Reconfigurable Bandpass Filters With High Selectivity, Large Bandwidth Variable Range, and Large Dynamic Range

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IEEE Transactions on Microwave Theory and Techniques 2024年第11期72卷 6387-6400页

作者： Chen, Ziyuan Li, Kun Liu, Yuanan Chi, Pei-Ling Yang, Tao University of Electronic Science and Technology of China School of Electronic Science and Engineering Sichuan Chengdu610054 China Beijing University of Posts and Telecommunications School of Electronic Engineering Beijing100876 China National Yang Ming Chiao Tung University Department of Electrical and Computer Engineering Hsinchu300 Taiwan

A design method of generating multiple transmission zeros (TZs) is proposed by introducing feeding-forward transconductance amplifiers for the cascaded Q-enhanced reconfigurable bandpass filters (BPFs) in this article. With the proposed method, it can generate two TZs at the upper and lower stopbands for every two Q-enhancement resonant units, significantly improving the stopband suppression. Furthermore, by controlling the feeding-forward amplifiers, the position of the zero and the depth of the TZs can be flexibly controlled. Meanwhile, to improve the power consumption, linearity, and noise figure (NF), the guideline of distribution of the transmission poles (TPs) generated by the Q-enhancement units is discussed in detail. To demonstrate the proposed method, a reconfigurable on-chip Q-enhanced BPF was designed and measured based on a 55-nm CMOS process with a core area of 1.36× 0.62mm. Multiple TZs were clearly observed in the filter and achieved a stopband suppression of more than 50 dBc up to 15 GHz. The bandwidth of the proposed filter can be tuned with a range covering from 0.2 to 1 GHz at a center frequency of 1.8 GHz, while the center frequency can be tuned from 1.68 to 1.94 GHz with a constant bandwidth of 600 MHz. The input 1-dB compression point (IP1dB) is better than -1 dBm for all tuning states, and the NF varies from 12.7 to 20.3 dB. The dynamic range (DR) can reach more than 165 dB and the total power consumption is less than 180 mW. © 2024 IEEE.

关键词： Bandpass filters

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Adaptive Control Strategy for Primary Frequency Regulation of BESS in Wind Farm 9

Adaptive Control Strategy for Primary Frequency Regulation o...

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9th Asia Conference on Power and electrical engineering, ACPEE 2024

作者： Gu, Yichao Zhuang, Kai Zhang, Jimiao Xie, Jianfeng Chongqing University of Science and Technology School of Electrical Engineering Chongqing China Rowan University Department of Electrical and Computer Engineering Glassboro United States

ISBN: (纸本)9798350309638

This paper proposes a novel adaptive synthetic inertia (SI) control scheme for the battery energy storage system (BESS) in the wind farm. The proposed approach dynamically adjusts the amplitude of the direct current (DC) of the voltage source converter (VSC) in response to grid frequency disturbances. The unique feature of the proposed control is its ability to emulate droop and inertia in real time by adjusting parameter values according to the rate of change of frequency (RoCoF) and frequency deviation. Within the SI control, a first-order low-pass element is incorporated into the virtual inertia control to augment the system inertia. Its advantages and effectiveness are rigorously demonstrated on a modified IEEE benchmark system under load changes and wind speed fluctuations. © 2024 IEEE.

关键词： Battery storage

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