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Signal propagation parameters estimation through designed multi layer fibre with higher dominant modes using OptiFibre simulation

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Journal of Optical Communications 2024年第0期45卷 s453-s463页

作者： Zaki Rashed, Ahmed Nabih Ahammad, S.K. Hasane Daher, Malek G. Sorathiya, Vishal Siddique, Abrar Asaduzzaman, Sayed Rehana, Hasin Dutta, Nitul Patel, Shobhit K. Nyangaresi, Vincent Omollo Jibon, Rayhan Habib Ibrahim, Anas Electronics and Electrical Communications Engineering Department Faculty of Electronic Engineering Menoufia University Menouf32951 Egypt Department of ECE Koneru Lakshmaiah Education Foundation Andhra Pradesh Vaddeswaram522302 India Physics Department Islamic University of Gaza P.O. Box 108 Gaza Palestine Department of Information and Communication Technology Marwadi University Rajkot India Department of Smart Robot Convergence and Application Engineering Pukyong National University Busan48513 Korea Republic of Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Computer Science and Engineering Rangamati Science and Technology University Rangamati Bangladesh Department of Computer Science and Engineering Daffodil International University Dhaka Bangladesh Computer Science and Engineering Department SRM University Andhra Pradesh Guntur India Electronics and Communication Engineering Department Marwadi University Gujarat Rajkot India Tom Mboya University College P.O. Box 199-40300 Homabay Kenya Electronics and Communication Engineering Discipline Khulna University Khulna9208 Bangladesh

The aim and scope of the paper is to simulate the signal propagation parameters estimation through designed multi-layer fibre with higher dominant modes by using OptiFibre simulation software. The multi-layer fibre profile has a length of 1000 m is designed and clarified with six layers. RI difference profile variations are clarified with radial distance variations. Modal/group index, group delay, dispersion, mode field diameter and total fibre losses are demonstrated with the fibre wavelength variations. All the dominant mode field distribution for multi-layer fibre are simulated and demonstrated. The other modes for designed multi-layer fibre with the theoretical fibre cutoff values for the different modes based the designed multi-layer fibre are analyzed and clarified clearly in details. © 2022 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Parameter estimation

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Polarization-controlled switching of magnetic anisotropy in CrSe2/Sc2CO2 multiferroic heterostructures

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Journal of physics: Condensed Matter 2025年第26期37卷 265803-265803页

作者： Zhijian He Daifeng Zou School of Physics and Electronic Science Hunan University of Science and Technology Xiangtan 411201 People’s Republic of China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials Xiangtan 411201 Hunan People’s Republic of China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and Engineering Xiangtan University Xiangtan 411105 People’s Republic of China

Recent breakthroughs in two-dimensional (2D) magnetic materials have unveiled intriguing phenomena in low-dimensional ferromagnetic (FM) systems. However, their integration into spintronic devices faces challenges due to the predominant in-plane (IP) orientation of the easy magnetization axis. Achieving nonvolatile electrical control over magnetic anisotropy in such systems is essential for advancing next-generation spintronic technologies. In this work, we introduce a multiferroic van der Waals (vdW) heterostructure design that enables dynamic manipulation of magnetoelectric coupling in 2D ferromagnets. By investigating the CrSe₂/Sc₂CO₂ heterostructure—comprising a FM CrSe₂ monolayer coupled with a ferroelectric Sc₂CO₂ layer—we demonstrate reversible switching of magnetic anisotropy via polarization engineering. Crucially, the system exhibits a controllable transition of the easy magnetization axis between IP and out-of-plane configurations, driven by ferroelectric polarization reversal. This magnetoelectric coupling mechanism unlocks novel functionalities for nonvolatile memory devices and adaptive logic components. Our findings provide a foundational strategy for voltage-free magnetic anisotropy tuning in vdWs heterostructures while elucidating interfacial magnetoelectric effects in low-dimensional systems.

关键词： ferroelectric heterostructures magnetic anisotropy

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Transient Analysis Based on Finite Element Method for Ball Grid Array Package

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IOP Conference Series: Earth and Environmental science 2021年第4期769卷

作者： Wenhao Luo Wei Su Xianshan Dong Zhenhua Nie Agam Tomar MOE Key lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia MOE Key lab of Disaster Forecast and Control in Engineering Perth Australia

In this paper, finite element simulation is carried out for BGA sample. The authors establishes the model of fixture, ceramic panel and metal sheet. Based on this model, several layers papers are laid on the metal sheet for simulation test. Then, ANASYS Workbench is used to conduct transient analysis of the samples to study the influence of different thickness papers on acceleration and time. The results provide useful reference for the adjustment of dynamic response parameters.

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Deformed relativistic Hartree-Bogoliubov theory in continuum with a point-coupling functional. II. Examples of odd Nd isotopes

arXiv

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arXiv 2022年

作者： Pan, Cong Cheoun, Myung-Ki Choi, Yong-Beom Dong, Jianmin Du, Xiaokai Fan, Xiao-Hua Gao, Wei Geng, Lisheng Ha, Eunja He, Xiao-Tao Huang, Jinke Huang, Kun Kim, Seonghyun Kim, Youngman Lee, Chang-Hwan Lee, Jenny Li, Zhipan Liu, Zhi-Rui Ma, Yiming Meng, Jie Mun, Myeong-Hwan Niu, Zhongming Papakonstantinou, Panagiota Shang, Xinle Shen, Caiwan Shen, Guofang Sun, Wei Sun, Xiang-Xiang Wu, Jiawei Wu, Xinhui Xia, Xuewei Yan, Yijun Yiu, To Chung Zhang, Kaiyuan Zhang, Shuangquan Zhang, Wei Zhang, Xiaoyan Zhao, Qiang Zheng, Ruyou Zhou, Shan-Gui State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China Institute Soongsil University Seoul156-743 Korea Republic of Department of Physics Pusan National University Busan46241 Korea Republic of Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Physics University of Chinese Academy of Sciences Beijing100049 China School of Physical Science and Technology Southwest University Chongqing400715 China School of Physics and Microelectronics Zhengzhou University Zhengzhou450001 China School of Physics Beihang University Beijing102206 China Department of Physics Hanyang University Seoul04763 Korea Republic of College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China Rare Isotope Science Project Institute for Basic Science Daejeon34000 Korea Republic of Department of Physics The University of Hong Kong Pokfulam999077 Hong Kong School of Mathematical Sciences Peking University Beijing100871 China Korea Institute of Science and Technology Information Daejeon34141 Korea Republic of School of Physics and Optoelectronics Engineering Anhui University Hefei230601 China School of Science Huzhou University Huzhou313000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu610068 China Center for Exotic Nuclei Studies Institute for Basic Science Daejeon34126 Korea Republic of School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou730000 China Synergetic Innovation Center for Quantum Eff

Background: One fascinating frontier in nuclear physics is the study of exotic nuclei. The deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc), which simultaneously includes the nuclear superfluidity, deformation, and continuum effects, can provide proper descriptions for both stable and exotic nuclei. In Zhang, et al. [Phys. Rev. C 102, 024314 (2020)], the DRHBc theory based on the point-coupling density functionals was developed and the DRHBc calculation, previously accessible only for light nuclei, was extended for all even-even nuclei in the nuclear chart. The ground-state properties for the even-even nuclei with 8 ≤ Z ≤ 120 from the DRHBc calculations have been summarized in Zhang, et al. [At. Data Nucl. Data Tables 144, 101488 (2022)]. Purpose: The aim of this work is to extend the point-coupling DRHBc theory to odd-A and odd-odd nuclei and examine its applicability by taking odd-A Nd isotopes as examples. Method: In the DRHBc theory, the densities and potentials with axial deformation are expanded in terms of Legendre polynomials, and the relativistic Hartree-Bogoliubov equations are solved in a Dirac Woods-Saxon basis to include the continuum effects. For an odd-A or odd-odd nucleus, the blocking effect of unpaired nucleon(s) is taken into account with the equal filling approximation. To determine its ground state, an automatic blocking procedure is adopted, in which the orbital with the lowest quasiparticle energy is blocked during the iteration. This procedure is justified by comparing with the results from the orbital-fixed blocking calculations, in which the blocked orbital near the Fermi surface is fixed during the iteration. The ground states for both light and heavy nuclei can be provided by the automatic blocking procedure as the orbital-fixed blocking procedure, but with considerably reduced computational cost. Results: The numerical details for even-even nuclei, including the convergence on the energy cutoff, angular momentum cutof

关键词： Ground state

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Towards Accurate Camouflaged Object Detection with Mixture Convolution and Interactive Fusion

arXiv

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arXiv 2021年

作者： Chen, Geng Chen, Xinrui Dong, Bo Zhuge, Mingchen Wang, Yongxiong Bi, Hongbo Chen, Jian Wang, Peng Zhang, Yanning National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology School of Computer Science and Engineering Northwestern Polytechnical University China Center for Brain Imaging Science and Technology Zhejiang University China School of Computer Science China University of Geo-sciences China Optical Electrical and Computer Engineering University of Shanghai for Science and Technology China School of Electrical Engineering & Information Department Northeast Petroleum University China School of Electronic Electrical Engineering and Physics Fujian University of Technology China

Camouflaged object detection (COD), which aims to identify the objects that conceal themselves into the surroundings, has recently drawn increasing research efforts in the field of computer vision. In practice, the success of deep learning based COD is mainly determined by two key factors, including (i) A significantly large receptive field, which provides rich context information, and (ii) An effective fusion strategy, which aggregates the rich multi-level features for accurate COD. Motivated by these observations, in this paper, we propose a novel deep learning based COD approach, which integrates the large receptive field and effective feature fusion into a unified framework. Specifically, we first extract multi-level features from a backbone network. The resulting features are then fed to the proposed dual-branch mixture convolution modules, each of which utilizes multiple asymmetric convolutional layers and two dilated convolutional layers to extract rich context features from a large receptive field. Finally, we fuse the features using specially-designed multilevel interactive fusion modules, each of which employs an attention mechanism along with feature interaction for effective feature fusion. Our method detects camouflaged objects with an effective fusion strategy, which aggregates the rich context information from a large receptive field. All of these designs meet the requirements of COD well, allowing the accurate detection of camouflaged objects. Extensive experiments on widely-used benchmark datasets demonstrate that our method is capable of accurately detecting camouflaged objects and outperforms the state-of-the-art methods. Copyright © 2021, The Authors. All rights reserved.

关键词： Deep learning

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Large-scale Atomistic Simulation of Quantum Effects in SrTiO3 from First Principles

arXiv

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arXiv 2022年

作者： Wu, Hongyu He, Ri Lu, Yi Zhong, Zhicheng CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

Quantum effects of lattice vibration play a major role in many physical properties of condensed matter systems, including thermal properties such as specific heat, structural phase transition, as well as phenomena such as quantum crystal and quantum paraelectricity that are closely related to zero-point fluctuations. However, realizing atomistic simulations for realistic materials with a fully quantum-mechanical description remains a great challenge. Here, we propose a first-principle strategy for large scale Molecular Dynamics simulation, where high accuracy force field obtained by Deep-Potential (DP) is combined with Quantum Thermal Bath (QTB) method to account for quantum effects. We demonstrate the power of this DP+QTB method using the archetypal example SrTiO3, which exhibits several phenomena induced by quantum fluctuations, such as the suppressed structure phase transition temperature, the quantum paraelectric ground state at low temperature and the quantum critical behavior 1/T2 law of dielectric constant. Our DP+QTB strategy is efficient in simulating large scale system, and is first principle. More importantly, quantum effects of other systems could also be investigated as long as corresponding DP model is trained. This strategy would greatly enrich our vision and means to study quantum behavior of condensed matter physics. Copyright © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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Magnetic tuning of band topology evidenced by exotic quantum oscillations in the Dirac semimetal EuMnSb2

arXiv

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arXiv 2022年

作者： Zhao, Kan Chen, Xuejiao Wang, Zhaosheng Liu, Jinyu Wu, Jiating Xi, Chuanying Lv, Xiaodong Li, Lei Zhong, Zhicheng Gegenwart, Philipp Experimentalphysik VI Center for Electronic Correlations and Magnetism University of Augsburg Augsburg86159 Germany School of Physics Beihang University Beijing100191 China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei230031 China Department of Physics & Astronomy University of California IrvineCA92697 United States Xi'an Institute of Biomedical Materials & Engineering Northwestern Polytechnical University 127 West Youyi Road Xi'An710072 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China

Interplay between magnetism and electronic band topology is of central current interest in topological matter research. We use quantum oscillations as powerful tool to probe the evolution of band topology in the Dirac semimetal EuMnSb2. The Eu local 4f magnetic moments display different antiferromagnetic states below 25 K and a field-polarized phase above 16 T. Upon cooling from 65 K into the field-polarized state, an exotic temperature dependent shift of oscillation peaks arises, accompanied by the development of non-zero Berry phase and a huge unconventional splitting of the oscillations. Band-structure calculations confirm the change from trivial to non-trivial band topology induced by the ferromagnetic Eu state, classifying EuMnSb2 as unique magnetic topological semimetal. Copyright © 2022, The Authors. All rights reserved.

关键词： Topology

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Research progress on the performance optimization and sodium storage-mechanism of biomass-derived hard carbon anode materials

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Journal of Energy Storage 2025年 125卷

作者： Li, Xuenuan Luo, Yuan Wang, Yujie Guo, Kailong Liao, Lei Liao, Dongliang Jiang, Li Zhang, Kaiyou Qin, Aimiao Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Material Science and Engineering Guilin University of Technology Guilin541004 China College of Environmental Science and Engineering Guilin University of Technology Guilin541004 China College of Natural Resources and Environment Northwest A&F University Yangling712100 China College of Physics and Electronic Information Engineering & Key Laboratory of Low-Dimensional Structural Physics and Application Education Department of Guangxi Zhuang Autonomous Region Guilin University of Technology Guilin541004 China

In the context of environmental protection and energy depletion, the development of green, high-yield, and low-cost energy storage materials has become a focal point in the advancement of new energy materials in today's society. In the new generation of energy storage systems, rechargeable batteries hold a key position in the energy and power sectors. Among these, sodium-ion batteries exhibit significant potential for development due to their abundant resources, low cost, and high safety. Biomass hard carbon anode materials have garnered considerable attention in the energy storage field owing to their abundant raw material sources, environmental friendliness, and inherent structural advantages. This paper systematically reviews the development history, classification, synthesis strategies, and energy storage mechanisms of biomass hard carbon anode materials in recent years. Additionally, it summarizes the characteristics of biomass-based electrode materials and discusses how to select promising precursors with potential applications from biomass. This work aims to provide guidance for the future preparation of high-performance biomass hard carbon anode materials. © 2025

关键词： Sodium-ion batteries

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Level attraction and PT symmetry in indirectly coupled microresonators

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Physical Review A 2020年第4期102卷 043527-043527页

作者： Zhao-Hui Peng Chun-Xia Jia Yu-Qing Zhang Ji-Bing Yuan Le-Man Kuang Institute of Modern Physics and Department of Physics College of Physics and Electronic Science Hunan University of Science and Technology Xiangtan 411201 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China College of Physics and Electronic Engineering and Hunan Provincial Key Laboratory of Intelligent Information Processing and Application Hengyang Normal University Hengyang 421008 China

Benefiting from the tunability of their phase delay and gain, we show the possibility of realizing level attraction, parity-time (PT)-, and anti-PT-symmetric photonic structures with indirectly coupled active and passive microresonators mediated by drop-filter waveguides. We find that level attraction originates from two mechanisms, i.e., exceptional point and resonance, and it may emerge not only for dissipative coupling but also coherent coupling and hybrid coupling after considering the gain and loss of microresonators, which confirms the universality of level attraction in the coupled photonic system. On the other hand, the transition from PT to anti-PT symmetry or vice versa may be realizable by tuning their phase delay and gain; thus the indirectly coupled microresonators may provide an excellent platform for exhibiting the unique features of PT and anti-PT symmetry. Furthermore, we also reveal the intrinsic relationship of the line shape and phase behavior of the reflection spectrum with PT symmetry, anti-PT symmetry, and level attraction.

关键词： Nanophotonics Optics & lasers Quantum optics Optical microcavities Waveguides Quantum theory

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Polarization regulated by anion engineering in bismuth-rich sulfohalides for enhanced piezocatalytic CO2 photomethanation

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Materials Today Energy 2025年 52卷

作者： Shi, Xian Dai, Weidong Yang, Chen Tang, Ruofei Dong, Xing'an School of Chemistry and Environmental Engineering Sichuan University of Science & Engineering Zigong 643000 China Research Center for Carbon-Neutral Environmental & Energy Technology Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China College of Physics and Electronic Engineering Chongqing Normal University Chongqing 401331 China Sichuan Provincial Engineering Research Center of Functional Development and Application of High Performance Special Textile Materials Chengdu Textile College Chengdu 611731 China

Catalytic conversion of CO2 to fossil fuels requires efficient separation and transfer of charge carriers of catalysts. Piezocatalysis can act as assistance to excite more active charges and prevent their recombination via utilization of mechanical energy, while lacking desirable catalysts with both of piezocatalytic and photocatalytic natures for piezocatalytic CO2 photoreduction. Herein, polar layered bismuth-rich sulfohalide Bi19S27X3 (X = Br, Cl) nanowires were used as efficient catalysts in the field of piezocatalytic CO2 photoreduction. The unique asymmetrical layered structures of Bi19S27X3 (X = Br, Cl) resulted in the favourable piezocatalytic CO2 photomethanation activities. Without any sacrificial agent or cocatalyst, Bi19S27X3 (X = Br, Cl) nanowires displayed piezocatalytic CO2 photoproduction yields of 110.40 and 80.04 μmol g⁻¹ after 6 h reduction reaction, respectively. The higher electronegativity of interleaved Cl⁻ than Br⁻ led to the stronger inherent polarization in Bi19S27Cl3, achieving the higher piezocatalytic CO2 photoreduction activity via halide anion engineering. This study illustrates the importance and effectiveness of halide anion engineering for piezocatalytic CO2 photoreduction and broadens the scope of photocatalysts with photocatalytic nature applied to solar energy conversion.

关键词： Bismuth-rich sulfohalides Charge separation Halide anion engineering Piezocatalytic CO2 photoreduction Polarization

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