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arXiv 2025年

作者： Xu, Hongsheng Zhan, Meng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

In the transient stability analysis of renewable energy grid-tied systems, although a large amount of works have devoted to the detailed electromagnetic transient simulation and the stability analyses of during-fault stage, the whole low-voltage ride through (LVRT) process and relevant transient stability mechanism remain to be uncovered. Taking the doubly fed induction generator system as the objective, this paper divides the transient processes into four different stages, including the pre-fault, during-fault, early post-fault, and late post-fault ones, establishes the full mechanism models for each stage, and studies the switching dynamics in detail. It is found that the during-fault dynamics can be determined by the phase-lock loop second-order equation within the framework of the generalized swing equation (GSE). For the early post-fault stage, it can be treated as a series of quasi-steady states and its dominant driving system dynamics can still be described by the GSE. Based on the local dynamics of unstable equilibrium point, the system transient stability can be completely determined by whether the initial state of the early post-fault stage is within or out of its basin of attraction (BOA). Based on these observations, the BOA-based and equal area criterion (EAC)-based transient stability assessment methods are developed, which are supported by broad numerical simulations and hardware-in-the-loop experiments. This work provides a clear physical picture and perfectly solves the difficult stability analysis problem when severe faults and LVRT have to be considered in most of DFIG engineering situations. Copyright © 2025, The Authors. All rights reserved.

关键词： Transient stability

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Directly Unveiling the Photothermal Corrosion of BiVO4 via In-situ Transmission Electron Microscopy

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Chemical Research in Chinese Universities 2025年第2期41卷 351-357页

作者： WANG Lindong SUN Jingyi WANG Lang LI Yu HU Zhiyi SU Baolian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering(ISME)Wuhan University of TechnologyWuhan 430070P.R.China Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070P.R.China CMI(Laboratory of Inorganic Materials Chemistry) University of Namurrue deBruxelles 61B-5000NamurBelgium

BiVO4(BVO)is widely utilized in photothermal catalysis because of its favorable bandgap structure(2.4 eV),excellent photo response capabilities and high thermal ***,the mechanism of BVO photothermal corrosion still remains unclear due to the lack of visualized characterization on the degradation process in real ***,we directly unveil the photothermal-induced microstructural evolution of BVO through in-situ heating(scanning)transmission electron microscopy[(S)TEM].The results indicate that the electrons are the initiating condition(“switch”)for the photothermal corrosion of BVO,resulting in the precipitation of Bi and reduction of V5+to V3+in the substrate,while the thermal field facilitates the evaporation of Bi and the recrystallization of *** work sheds light on the mechanism of BVO photothermal corrosion in dynamics and provides significant insights into the photothermal synergistic effects.

关键词： BiVO4 Photothermal corrosion In-situ transmission electron microscopy(TEM) Photothermal catalysis Structural evolution

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Numerical simulation of the effect of hydrogen rich gas type and injection amount on the blast furnace tuyere raceway

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International Journal of Hydrogen Energy 2025年 133卷 261-275页

作者： Dang, Han Zhang, Cuiliu Zhang, Jianliang Xu, Runsheng Wang, Mingyong Jia, Guoli Lan, Dawei State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing100083 China School of Chemical Engineering The University of Queensland QLD4072 Australia Technology Research Institute of Shougang Group Co. LTD Shougang Group Co. LTD Hebei 050011 China

This study investigated a commercial blast furnace (BF) in China using a three-dimensional computational fluid dynamics (CFD) model that replicated the actual geometry of the coal lance, tuyere, and raceway. Focusing on the effects of natural gas (NG), coke oven gas (COG), and hydrogen (H2) within the raceway, the results revealed that hydrogen-rich gas injection increased the tuyere exit temperature, with NG demonstrating superior efficacy in elevating localized temperatures. However, higher volumes of injected hydrogen-rich gas were associated with reduced outlet temperatures and lower pulverized coal (PC) burnout rates. This phenomenon was attributed to the oxygen competition between gas combustion and PC oxidation, as hydrogen-rich fuels demanded greater oxygen allocation, thereby suppressing PC combustion efficiency. These findings establish a theoretical foundation for optimizing hydrogen-enriched gas injection strategies in BF ironmaking. © 2025 Hydrogen Energy Publications LLC

关键词： Pulverized fuel

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Kerr-lens mode-locked Ho:CALYO laser at 2.1 µm

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Optics Express 2025年第8期33卷 18017-18023页

作者： Wang, Jing Yao, Weichao Liu, Jian Xu, Xiaodong Xu, Jun Leng, Yuxin State Key Laboratory of Ultra-intense Laser Science and Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Jiangsu Key Laboratory of Advanced Laser Materials and Devices Jiangsu Normal University Xuzhou221116 China School of Physics Science and Engineering Institute for Advanced Study Tongji University Shanghai200092 China

We report on a Kerr-lens mode-locked Ho laser operating at 2.1 µm, based on a disordered structure crystal Ho:CALYO. The laser-generated ultrashort pulses with a pulse duration of 177 fs and an average output power of 0.81 W at a repetition rate of 90 MHz, with an optical-to-optical efficiency of 11%. By optimizing the system for shorter pulse durations, we achieved pulses as short as 166 fs, though at a reduced output power of 0.18 W. The pulse duration and output power limitations were analyzed and discussed. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Pulse repetition rate

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Retrieving the Target Properties using FW-LiDAR: Current and Future 10

Retrieving the Target Properties using FW-LiDAR: Current and...

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10th Symposium on Novel Optoelectronic Detection technology and Applications

作者： Fang, Jiajie Wang, Yongxiang Zhang, Xinyuan Xia, Yuhao Hu, Yihua State Key Laboratory of Pulsed Power Laser Technology College of Electronic Engineering National University of Defense Technology Hefei230037 China Anhui Laboratory of Advanced Laser Technology Electronic Countermeasure Institute National University of Defense Technology Hefei230037 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Full-waveform Light Detection and Ranging (FW-LiDAR) systems emit laser pulses to illuminate targets and capture the reflected pulse's temporal distribution, creating a modulated echo waveform. The echo waveform's properties, such as peak intensity, pulse width, and extent, provide FW-LiDAR with the capability to detail target properties, from structural to biophysical and biochemical characteristics. Despite various methods for analyzing FW-LiDAR data and extracting target properties, a comprehensive review of the current state and future development of target information retrieval using FW-LiDAR is seldom seen. This paper focusing on background, typical application, and limitation of current data analysis method in FW-LiDAR domain. Owing to that a quantitative and concise relationship between the properties of targets and the features of modulated echo waveform has not been evaluated, the general data processing method in FW-LiDAR is still lacking. The current methods can be roughly classified into three categories. The first is the empirical and phenomenological methods. It is majorly the waveform decomposition and deconvolution methods, including Gaussian, generalized Gaussian, log normal Gaussian, Burr decomposition methods, and Richardson-Lucy, Gold, and Blind deconvolution methods. The waveform metrics description parameters following the decomposition include height metrics, and energy metrics. The advantage of this method is facile, while the limitation is that the correspondence between the decomposed or deconvoluted waveform metrics and the properties of targets has also not been established. The second is the model inversion method, including the look-up table method, the iterative numeric optimization method, and the gap theory to extract the target information. This method compares the echo waveform simulated using computing model with the measured. When the waveforms agree excellently, the properties of targets in the simulation approaches the actual.

关键词： Table lookup

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Self-assembled K+ion channel constructed by a Janus-type self-complementary molecule

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Science Bulletin 2025年第7期70卷 1042-1045页

作者： Shihao Pang Chuantao Wang Tianlong Li Zexin Yan Xiaoting Wang Kui Gao Li Zhao Chunyan Bao Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistryInstitute of Fine ChemicalsSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism School of PharmacyEast China University of Science and TechnologyShanghai 200237China

The natural ion channels embedded within cell membranes are vital protein structures that govern ion transport and regulate the fundamental cell physiological processes,including the initiation of muscle contraction,modulation of cellular excitability,stimulation of glandular secretion,and facilitation of rapid signal transmission in neurons[1].The dysfunction of ion channels can lead to various threatening diseases[2].However,research on natural ion channel receptors is challenging because of their limited availability,complex structures,and labile ***,considerable efforts have been made to create various synthetic channels as models of their biological counterparts[3,4].

关键词： cell membranes self assembled ion channels protein structures facilitation rapid signal transmission ion transport muscle contractionmodulation cellular excitabilitystimulation glandular secretionand ion channels Janus type self complementary molecules

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Parallel Welch–Berlekamp Algorithm

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IEEE Transactions on Information Theory 2025年第5期71卷 3473-3488页

作者： Chen, Chao Han, Yunghsiang S. Tang, Nianqi Ma, Xiao Bai, Baoming Xidian University State Key Laboratory of ISN Xi’an710071 China University of Electronic Science and Technology of China Shenzhen Institute for Advanced Study Shenzhen518000 China Sun Yat-sen University School of Computer Science and Engineering Guangzhou510006 China

This paper presents new variants of the Welch-Berlekamp algorithm that are favorable to hardware implementation. First, we derive the parallel Welch-Berlekamp (PWB) algorithm in a constructive manner based on the properties of solutions to the rational interpolation problem. The algorithm features the simultaneously performed discrepancy computation and polynomial update. Second, we explore the early-termination mechanism of the PWB algorithm for decoding of Reed-Solomon (RS) codes. By introducing the concept of incomplete error locator polynomial, we show that if e ≤ t (where e is the number of errors and t is the error correction capability), the PWB algorithm can be terminated at latest at the completion of the (t+ e) -th iteration. This leads to the early-terminating PWB (EPWB) algorithm. Finally, we develop frequency-domain versions of the PWB and EPWB algorithms, namely, FPWB and FEPWB. The key point toward the two algorithms is to replace the update of polynomial coefficients with the update of polynomial evaluations. It is worth noting that the FEPWB algorithm applies only to shortened RS codes. Furthermore, an efficient systolic architecture for the FPWB algorithm is designed, which is easily adapted for the FEPWB algorithm. © 1963-2012 IEEE.

关键词： Reed-Solomon codes

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Broadband, high-linearity TFLN electro-optic modulator for integrated microwave photonics using reconfigurable dual-parallel modulation

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Optics Express 2025年第6期33卷 13805-13815页

作者： Qin, Yan-Yan Gu, Xiao-Wen Tang, Jie Ye, Hui-Yan Dong, Wen-Hao Song, Yuan-Jun Qian, Guang Zhang, Xiao-Yang Zhang, Tong Southeast University Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and Engineering Jiangsu Nanjing210096 China National Key Laboratory of Solid-state Microwave Devices and Circuits Nanjing210016 China Nanjing Electronic Devices Institute Nanjing210016 China Key Laboratory of Micro-inertial Instrument and Advanced Navigation Technology Ministry of Education School of Instrument Science and Engineering Southeast University Jiangsu Nanjing210096 China Suzhou Key Laboratory of Metal Nano-optoelectronic Technology Southeast University Suzhou Campus Jiangsu Suzhou215123 China

Integrated electro-optic modulators with large bandwidth, high linearity and low driving voltage are key building blocks for integrated microwave photonic (IMWP) links to transmit broadband signals with high fidelity. In this work, thin-film lithium niobate electro-optic modulator consisting of a thermo-optic reconfigurable coupler and dual-parallel Mach-Zehnder modulation scheme is proposed and demonstrated to achieve spurious-free dynamic range of 112.87/107.71 dB·Hz2/3 at 1/10 GHz while keeping large bandwidth (>67 GHz) and low half-wave voltage (2.7 V) simultaneously. The demonstration of this device paves a new route for high-performance electro-optic modulators in future functional IMWP systems. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Fiber optic communications Integrated photonics Lithium niobate Microwave photonics Optical components Silicon modulators

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Revisiting Dipole-Induced Fluorinated-Anion Decomposition Reaction for Promoting a LiF-Rich Interphase in Lithium-Metal Batteries

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Nano-Micro Letters 2025年第5期17卷 263-280页

作者： Liu Wang Jiahui Guo Qi Qi Xiaotong Li Yuanmeng Ge Haoyi Li Yunfeng Chao Jiang Du Xinwei Cui Henan Institutes of Advanced Technology Zhengzhou UniversityZhengzhou 450003People’s Republic of China College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China State Key Laboratory of Coking Coal Resources Green Exploitation Zhengzhou UniversityZhengzhou 450001People’s Republic of China

Building anion-derived solid electrolyte interphase(SEI)with enriched LiF is considered the most promising strategy to address inferior safety features and poor cyclability of lithium-metal batteries(LMBs).Herein,we discover that,instead of direct electron transfer from surface polar groups to bis(trifluoromethanesulfonyl)imide(TFSI-)for inducing a LiF-rich SEI,the dipole-induced fluorinated-anion decomposition reaction begins with the adsorption of Li ions and is highly dependent on their mobility on the polar *** demonstrate this,a single-layer graphdiyne on MXene(sGDY@MXene)heterostructure has been successfully fabricated and integrated into polypropylene *** is found that the adsorbed Li ions connect electron-donating sGDY@MXene to TFSI-,facilitating interfacial charge transfer for ***,this does not capture the entire *** sGDY@MXene also renders the adsorbed Li ions with high mobility,enabling them to reach optimal reaction sites and expedite their coordination processes with O on O=S=O and F on the broken–CF_3~-,facilitating bond *** contrast,immobilized Li ions on the more lithiophilic pristine MXene retard these cleavage ***,the decomposition reaction is accelerated on sGDY@*** work highlights the dedicate balance between lithiophilicity and Li-ion mobility in effectively promoting a LiF-rich SEI for the long-term stability of LMBs.

关键词： LiF-rich SEI Li-ion mobility Lithiophilicity MXene Graphdiyne

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A GNN-Guided Variable Selection Approach for Efficient Derivation of the Optimal Solution in Unit Commitment

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IEEE Transactions on Power Systems 2025年

作者： Wei, Lishen Ai, Xiaomeng Fang, Jiakun Cui, Shichang Liao, Shiwu Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China TODE Co. Ltd. Nanjing210046 China

The growing scale of the power system has intensified the demand for computational efficiency in unit commitment (UC). This paper introduces a novel approach that addresses this issue by adopting graph neural networks (GNN) into the Branch and Bound (B&B), integrating the characteristics of variable selection (VS) within UC problems. Our method focuses on efficiently obtaining optimal solutions using the GNNguided VS approach. Specifically, we investigate the characteristics of the high-quality but time-consuming VS heuristic when solving UC problems. Then, the GNN incorporates these characteristics to make highquality VS decisions accurately and quickly. In the implementation, the UC model is solved using a highquality but time-consuming VS heuristic to collect training data. These data are employed to train the GNN model with designed label-smooth and depthadaptive mechanisms, which exploit these characteristics in UC problems for acceleration. To evaluate the effectiveness, we conduct various experiments on the IEEE118, RTS-GMLC, and a real-world provincial system in China. The overall performance demonstrates significant improvements (4.6x, 1.5x, and 1.8x, respectively) in computational efficiency. The comparison experiments show that the proposed mechanisms contribute to enhanced learning performance and, thus, further UC acceleration. Moreover, our approach exhibits promising generalization capabilities. © 1969-2012 IEEE.

关键词： Graph neural networks

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