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IEEE Transactions on Intelligent Vehicles 2024年 1-16页

作者： Jia, Zhenyu Zhang, Rongxin Chen, Zhong Yuan, Fei Key Laboratory of Underwater Acoustic Communication and Marine Information Technology Xiamen University Xiamen China School of Electronic Science and Engineering Xiamen University Xiamen China

Autonomous underwater vehicles (AUVs) equipped with acoustic modems are currently one of the important means of obtaining underwater environment data such as sounds and images. They rely on high-speed underwater acoustic (UWA) communication technology for data transmission tasks. Orthogonal chirp division multiplexing (OCDM) is a multicarrier method based on chirp spread spectrum (CSS) which has better reliability in frequency selective fading channels than orthogonal frequency division multiplexing (OFDM). In this work, we combine index modulation (IM) and propose an OCDM-IM system that provides faster data rates when it activates the same number of subchirps as OCDM. On the other hand, it activates fewer subchirps when the data rate is the same, so it has better anti-interference capability. The simulation results under a measured UWA channel and random channels and the experimental results show that OCDM-IM has a better bit-error rate (BER) performance than that of OCDM and OFDM-IM systems when the subchirps are not fully loaded. In particular, when a small number of subchirps are activated, OCDM-IM is able to provide up to 2x bit rate with more than 5 dB improvement in BER performance. Our simulation and experimental results also show that IM has much better reliability than constellation mapping when Doppler effect is considered. Therefore, OCDM-IM is more suitable for the communication of AUVs. IEEE

关键词： Peak to average power ratio

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Spectrally resolved Franson interference

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science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 11-17页

作者： Rui-Bo Jin Zi-Qi Zeng Dan Xu Chen-Zhi Yuan Bai-Hong Li You Wang Ryosuke Shimizu Masahiro Takeoka Mikio Fujiwara Masahide Sasaki Pei-Xiang Lu Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China School of Physics and Information Science Shaanxi University of Science and TechnologyXi'an 710021China Southwest Institute of Technical Physics Chengdu 610041China Graduate School of Informatics and Engineering University of Electro-CommunicationsTokyo 182-8585Japan Department of Electronics and Electrical Engineering Keio UniversityKanagawa 223-8522Japan National Institute of Information and Communications Technology Tokyo 184-8795Japan

Franson interference can be used to test the nonlocal features of energy-time entanglement and has become a standard in quantum ***,most of the previous Franson interference experiments were demonstrated in the time domain,and the spectral properties of Franson interference have not been fully ***,we theoretically and experimentally demonstrate spectrally resolved Franson interference using biphotons with different correlations,including positive correlation,negative correlation,and *** is found that the joint spectral intensities of the biphotons can be modulated along both the signal and idler directions,which has potential applications in generating high-dimensional frequency entanglement and time-frequency grid *** work may provide a new perspective for understanding the spectral-temporal properties of the Franson interferometer.

关键词： resolved correlation spectral

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High-temperature oxidation resistance of Si-coated C/SiC composites

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Rare Metals 2024年第9期43卷 4566-4572页

作者： Jie Xiao Hua-Yue Zhang Sheng-Kai Gong Hui-Bin Xu Hong-Bo Guo School of Materials Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of High-Temperature Structure Materials and Protective Coatings(Ministry of Industry and Information Technology) Beihang UniversityBeijing 100191China

In this paper,Si coatings were sprayed onto C/SiC composite substrates by atmospheric plasma spraying(APS).The high-temperature oxidation behavior of the substrate and coating at temperatures of 1100 and 1300℃was also *** C/SiC ceramic matrix composite will be damaged seriously and even failed due to the oxidation of carbon fibers in *** Si coating effectively improved the oxidation resistance of the C/SiC substrate in the high-temperature oxidation *** effect of the thickness of the Si coatings on the oxidation resistance was *** 150-μm coating is proved to enable the substrate to have the lowest oxidation weight loss and the best oxidation resistance after static oxidation for 5 h.

关键词： Ceramic matrix composites(CMCs) Carbon fiber Si coating Oxidation Plasma spray

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Improving Nighttime Flare Removal with Subspace Basic Projection 2

Improving Nighttime Flare Removal with Subspace Basic Projec...

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2nd IEEE International Conference on Signal, information and Data Processing, ICSIDP 2024

作者： Lian, Jiazheng Liu, Zherong Jing, Minge Zhou, Jun Fan, Yibo State Key Laboratory of Integrated Chips and Systems Fudan University Academy for Engineering and Technology Shanghai China University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu China Fudan University State Key Laboratory of Integrated Chips and Systems Shanghai China

ISBN: (纸本)9798331515669

Flare is an imaging issue caused by optical refraction in the lens. The imaging hazards caused by flares are more pronounced at night due to the large difference in intensity between the light source and the background. Since it is difficult to infer a flare-free scene from a flare-corrupted image, recovering textures under nighttime flare remains a challenging problem. In this paper, we propose a novel nighttime flare removal framework based on subspace projection and a jet map mask-based crossattention mechanism to remove nighttime flare and recover the scene under the flare, termed FBNet. On one hand, we propose subspace projection as a function of the flare basis network to better separate the flare from the scene. On the other hand, we found that the binarized threshold segmentation result obtained by using the jet map as a threshold segmentation condition is remarkably effective in extracting the flare as an input feature to the cross-attention mechanism. Therefore, we came out with a jet map-based transformer cross-attention block that uses a binary mask as a priori to achieve optimal recovery in the flare region Extensive evaluations on synthetic benchmarks and the real-world datasets Flare7K and Flare7pp highlight the superiority of our approach compared to the previous state-of-the-art methods for flare removal. All proposed methods improve the nighttime flare removal performance. © 2024 IEEE.

关键词： Image reconstruction

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Decoupling the nonthermal effect of current by electrically assisted crystal plasticity modeling of Ni-based single crystal superalloys

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Journal of Materials science & technology 2025年第1期204卷 91-103页

作者： Jia Gao Hongwei Li Xin Zhang Guangda Shao Zhiyu Xiang Xinxin Sun State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical and Electrical Engineering Northwestern Polytechnical UniversityXi’an 710072China Ministry of Industry and Information Technology Key Laboratory of Aeroengine Technology Northwestern Polytechnical UniversityXi’an 710072China

The electrically assisted(EA)deformation process has received considerable attention in recent years,ac-companied by research on current-induced deformation ***,there are still challenges in eliminating thermal effects,which have prevented a comprehensive understanding of the underlying current-induced *** for a single crystal(SC)in research provides advantages in decou-pling the nonthermal effect of electric current at smaller scales and eliminating the complex interactions that exist in polycrystalline ***,the innovation of this work lies in decoupling the non-thermal effect of electric current and conducting a comprehensive analysis of anisotropic deformation and mechanisms within a Ni-based SC with different crystallographic axes and various current directions dur-ing electrically assisted tensile simulation.A significant tension axis direction in the SC during EA tension was induced by the combination of a higher current direction factor(|cosθ|)and a dimensionless factor for the current density(|J^(α)/J_(0)^(α)|)along the[100]*** stress drop within the SC due to the nonthermal effect of electric current generally increased with increasing current *** was attributed to the increased dislocation density differences and decreased *** increased stress anisotropy of the SC at a current direction of 45°was attributed to fewer activated(111)slip systems and the pinning effect of more dislocations within these *** study advances our understanding of the thermal and nonthermal effects of electric current and offers valuable insights for the informed application of EA deformations in industrial and aerospace settings with SC superalloys.

关键词： Electrically assisted(EA)tension Single crystal superalloys Nonthermal effect Anisotropy Tension axis Current direction

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Recent progress in hydrogen:From solar to solar cell

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Journal of Materials science & technology 2024年第9期176卷 236-257页

作者： Yanlin Li Zhu Ma Shanyue Hou Qianyu Liu Guangyuan Yan Xiaoshan Li Tangjie Yu Zhuowei Du Junbo Yang Yi Chen Wei You Qiang Yang Yan Xiang Shufang Tang Xuelin Yue Meng Zhang Wenfeng Zhang Jian Yu Yuelong Huang Jiale Xie Chun Tang Yaohua Mai Kuan Sun School of New Energy and Materials Southwest Petroleum University(SWPU)Chengdu 610500China Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Key Laboratory of Low-grade Energy Utilization Technologies and Systems(MoE) School of Energy and Power EngineeringChongqing UniversityChongqing 400044China

Hydrogen,meeting the requirements of sustainable development,is regarded as the ultimate energy in the 21st *** to the inexhaustible and feasible of solar energy,solar water splitting is an immensely promising strategy for environmental-friendly hydrogen production,which not only overcomes the fluctuation and intermittency but also contributes to achieving the mission of global“Carbon Neutrality and Carbon Peaking”.However,there is still a lack of a comprehensive overview focusing on hydrogen progress with a discussion of development from solar energy to solar ***,we emphasize several solar-to-hydrogen pathways from the basic concepts and principles and focus on photovoltaic-electrolysis and photoelectrochemical/photovoltaic systems,which have achieved solar-to-hydrogen(STH)efficiency of over 10%and have extremely promising for large-scale *** addition,we summarize the challenges and opportunities faced in this field including configuration design,electrode materials,and performance ***,perspectives on the potential commercial application and scientific research for the further development of solar-to-hydrogen are analyzed and presented.

关键词： Hydrogen Photovoltaics Catalysis STH efficiency Integrated module

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REQUIRED NUMBER OF ITERATIONS FOR SPARSE SIGNAL RECOVERY VIA ORTHOGONAL LEAST SQUARES

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Journal of Computational Mathematics 2023年第1期41卷 1-17页

作者： Haifeng Li Jing Zhang Jinming Wen Dongfang Li Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal Control College of Mathematics and Information ScienceHenan Normal UniversityXinxiang 453007China College of Information Science and Technology Jinan UniversityGuangzhou 510632China School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China

In countless applications,we need to reconstruct a K-sparse signal x∈R n from noisy measurements y=Φx+v,whereΦ∈R^(m×n)is a sensing matrix and v∈R m is a noise *** least squares(OLS),which selects at each step the column that results in the most significant decrease in the residual power,is one of the most popular sparse recovery *** this paper,we investigate the number of iterations required for recovering x with the OLS *** show that OLS provides a stable reconstruction of all K-sparse signals x in[2.8K]iterations provided thatΦsatisfies the restricted isometry property(RIP).Our result provides a better recovery bound and fewer number of required iterations than those proposed by Foucart in 2013.

关键词： Sparse signal recovery Orthogonal least squares(OLS) Restricted isometry property(RIP)

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Activation Distance and Capacity Analysis for Ambient Backscatter Communications with Sensitivity Constraint and Beamforming

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China Communications 2024年第11期21卷 257-266页

作者： Mu Yunping Fan Dian Wang Gongpu Xu Yongjun Kuang Lei Engineering Research Center of Network Management Technology for High Speed Railway of Ministry of Education School of Computer and Information TechnologyBeijing Jiaotong UniversityBeijing 100044China China Academy of Information and Communications Technology Beijing 100191China School of Communication and Information Engineering Chongqing University of Posts and TelemcommunicationsChongqing 400065China Shanghai Key Laboratory of Multidimensional Information Processing Engineering Center of SHMEC for Space Information and GNSSSchool of Information Science and TechnologyEast China Normal UniversityShanghai 200241China

Circuit sensitivity of sensors or tags without battery is one practical constraint for ambient backscatter communication *** letter considers using beamforming to reduce the sensitivity constraint and evaluates the corresponding performance in terms of the tag activation distance and the system ***,we derive the activation probabilities of the tag in the case of single-antenna and multi-antenna ***,we obtain the capacity expressions for the ambient backscatter communication system with beamforming and illustrate the power allocation that maximizes the system capacity when the tag is ***,simulation results are provided to corroborate our proposed studies.

关键词： activation distance ambient backscatter communications beamforming channel capacity power allocation sensitivity

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Epitaxial growth of 2D gallium selenide flakes for strong nonlinear optical response and visible-light photodetection

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Frontiers of physics 2023年第5期18卷 237-244页

作者： Mengting Song Nan An Yuke Zou Yue Zhang Wenjuan Huang Huayi Hou Xiangbai Chen Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As an emerging groupⅢ–Ⅵsemiconductor two-dimensional(2D)material,gallium selenide(GaSe)has attracted much attention due to its excellent optical and electrical *** this work,high-quality epitaxial growth of few-layer GaSe nanoflakes with different thickness is achieved via chemical vapor deposition(CVD)*** to the non-centrosymmetric structure,the grown GaSe nanoflakes exhibits excellent second harmonic generation(SHG).In addition,the constructed GaSe nanoflake-based photodetector exhibits stable and fast response under visible light excitation,with a rise time of 6 ms and decay time of 10 *** achievements clearly demonstrate the possibility of using GaSe nanoflake in the applications of nonlinear optics and(opto)-electronics.

关键词： 2D materials gallium selenide second harmonic generation chemical vapor deposition photodetector

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Multi-functional and multi-scenario applications for MXene aerogels with synergistically enhanced asymmetric modules

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Nano Research 2024年第4期17卷 3359-3368页

作者： Junru Yao Jintang Zhou Feng Yang Guiyu Peng Yijie Liu Zhengjun Yao Fan Wu Haibo Zeng College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

The development of multifunctional materials and synergistic applications of various functions are important conditions for integrated and miniaturized ***,we developed asymmetric MXene/aramid nanofibers/polyimides(AMAP)aerogels with different modules using an integrated molding *** asymmetric modules(layered MXene/aramid nanofibers section and porous MXene/aramid nanofibers/polyimides section)interactions are beneficial for enhanced performances,resulting in low reflection electromagnetic interference(EMI)shielding(specific shielding effectiveness of 2483(dB·cm^(3))/g and a low R-value of 0.0138),high-efficiency infrared radiation(IR)stealth(ultra-low thermal conductivity of 0.045 W/(m·K)and IR emissivity of 0.32 at 3–5μm and 0.28 at 8–14μm),and excellent thermal management performances of insulated Joule ***,these multifunctional AMAP aerogels are suitable for various application scenarios such as personal and building protection against electromagnetic pollution and cold,as well as military equipment protection against infrared detection and EMI.

关键词： multifunctional material electromagnetic interference shielding low reflection infrared radiation stealth thermal insulation Joule heating

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