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Ultrafast ranging using a dispersion-controlled dual-swept laser

Photonics Research 2025年第5期 1182-1190页

作者： WEI DU LEI CHEN YUJIA LI JINDONG WANG YULONG CAO LIGANG HUANG LEILEI SHI LEI GAO LEI WEI TAO ZHU Laboratory of Optoelectronic Technology & System (Ministry of Education) Chongqing University National Key Laboratory of Advanced Laser and High Power Microwave Institute of Applied Electronics China Academy of Engineering Physics School of Electrical and Electronic Engineering Nanyang Technological University

Ranging is indispensable in a variety of fields,encompassing basic science,manufacturing,production,and daily *** traditional methods based on the dispersive interferometry (DPI) in the frequency domain provide high precision,their measurement speed is slow,preventing the capture and measurement of dynamic ***,we propose a fast and precise ranging method based on the dispersion-controlled dual-swept laser(DCDSL),which allows the dynamical displacement measurement of the target under *** to the slight frequency sweeping speed difference between the signal and reference lights,there is a zero-frequency point of the oscillation (ZPO) generated in the interference signal,whose position in the time domain is linearly related to the relative delay between the signal and reference *** phase demodulation of the interference signal from the DCDSL and the fitting algorithm,the time-domain position of ZPO is accurately found,which precisely maps to the displacement of the target in real time without direction *** fast frequency sweeping rate ensures fast ranging with the MHz order refresh *** have experimentally demonstrated its capabilities for precise measurement of static distances and the capture of dynamic displacement processes through simulations and experiments,with the measurement range encompassing the entire interference period(56 mm).Compared to a calibrated motorized displacement platform,the residual error for full-range distance measurements is within 10μm,and the error in average speed during dynamic processes is 0.46%.Additionally,the system exhibits excellent stability,achieving a minimum Allan deviation of 4.25 nm over an average duration of approximately 4 *** method ensures high precision while maintaining a simple system,thereby advancing the practical implementation of ultrafast length metrology.

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Toward batch synthesis of high-quality graphene by cold-wall chemical vapor deposition approach

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Nano Research 2022年第11期15卷 9683-9688页

作者： Kaicheng Jia Ziteng Ma Wendong Wang Yongliang Wen Huanxin Li Yeshu Zhu Jiawei Yang Yuqing Song Jiaxin Shao Xiaoting Liu Qi Lu Yixuan Zhao Jianbo Yin Luzhao Sun Hailin Peng Jincan Zhang Li Lin Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China School of Physics and Astronomy University of ManchesterManchester M139PLUK State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Engineering University of CambridgeCambridge CB30FAUK Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Key Laboratory of Opto-Electronics Technology Ministry of EducationCollege of Electronic Science and TechnologyFaculty of Information TechnologyBeijing University of TechnologyBeijing 100024China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Chemical vapor deposition(CVD)has emerged as a promising approach for the controlled growth of graphene films with appealing scalability,controllability,and ***,the synthesis of high-quality graphene films still suffers from low production capacity and high energy consumption in the conventional hot-wall CVD *** contrast,owing to the different heating mode,cold-wall CVD(CW-CVD)system exhibits promising potential for the industrial-scale production,but the quality of as-received graphene remains inferior with limited domain size and high defect ***,we demonstrated an efficient method for the batch synthesis of high-quality graphene films with millimeter-sized domains based on CW-CVD *** reduced defect density and improved properties,the as-received graphene was proven to be promising candidate material for electronics and anti-corrosion *** study provides a new insight into the quality improvement of graphene derived from CW-CVD system,and paves a new avenue for the industrial production of high-quality graphene films for potential commercial applications.

关键词： graphene cold-wall chemical vapor deposition(CVD) defects electrical performance

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Distributed Generalized Nash Equilibria Learning for Online Stochastic Aggregative Games

arXiv

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arXiv 2025年

作者： Du, Kaixin Meng, Min Shanghai Research Institute for Intelligent Autonomous Systems Tongji University Shanghai200092 China Department of Control Science and Engineering College of Electronics and Information Engineering National Key Laboratory of Autonomous Intelligent Unmanned System Frontiers Science Center for Intelligent Autonomous Systems Ministry of Education Shanghai Research Institute for Intelligent Autonomous Systems Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai China

This paper investigates online stochastic aggregative games subject to local set constraints and time-varying coupled inequality constraints, where each player possesses a time-varying expectation-valued cost function relying on not only its own decision variable but also an aggregation of all the players’ variables. Each player can only access its local individual cost function and constraints, necessitating partial information exchanges with neighboring players through time-varying unbalanced networks. Additionally, local cost functions and constraint functions are not prior knowledge and only revealed gradually. To learn generalized Nash equilibria of such games, a novel distributed online stochastic algorithm is devised based on push-sum and primal-dual strategies. Through rigorous analysis, high probability bounds on the regret and constraint violation are provided by appropriately selecting decreasing stepsizes. Moreover, for a time-invariant stochastic strongly monotone game, it is shown that the generated sequence by the designed algorithm converges to its variational generalized Nash equilibrium (GNE) almost surely, and the time-averaged sequence converges sublinearly with high probability. Finally, the derived theoretical results are illustrated by numerical simulations. Copyright © 2025, The Authors. All rights reserved.

关键词： Nash equilibrium

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Major strategies for improving the performance of perovskite solar cells

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iEnergy 2023年第3期2卷 172-199页

作者： Lixiu Zhang Hang Li Kai Zhang Wenzhe Li Chuantian Zuo George Omololu Odunmbaku Jingde Chen Cong Chen Luozheng Zhang Ru Li Yuping Gao Baomin Xu Jiangzhao Chen Yongsheng Liu Yang Wang Yanlin Song Jianxin Tang Feng Gao Qing Zhao Yong Peng Mingzhen Liu Lei Tao Yuelong Li Zhimin Fang Ming Cheng Kuan Sun Dewei Zhao Yixin Zhao Shihe Yang Chenyi Yi Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Shenzhen Graduate School Peking UniversityShenzhen 518055China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Sichuan UniversityChengdu 610065China School of Energy&Power Engineer-ing Chongqing UniversityChongqing 400044China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China Institute of New Energy Technology Department of Electronic EngineeringCollege of Information Science and TechnologyJinan UniversityGuangzhou 510631China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China College of Optoelectronic Engineering Chongqing UniversityChongqing 400044China College of Chemistry Nankai UniversityTianjin 300071China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelec-tronics School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Institute of Photoelectronic Thin Film Devices and Technology Nankai UniversityTianjin 300350China School of Materials Science and Engineering Shaanxi Normal UniversityXi’an 710119China

Metal halide perovskite solar cell(PSC)has successfully distinguished itself in optoelectronic field by virtue of the sharp rise in power conversion efficiency over the past *** remarkable efficiency breakthrough at such a fast speed can be mainly attributed to the comprehensive study on film deposition techniques,especially the effective management of surface and interfacial defects in recent ***,we summarized the current trends in performance enhancement for PSCs,with a focus on the generally applicable strategies in high-performance works,involving deposition methods,compositional engineering,additive engineering,crystallization manipulation,charge transport material selection,interfacial passivation,optical coupling effect and constructing tandem solar *** directions and perspectives are also provided.

关键词： Perovskite solar cells efficiency improvement strategies milestones

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Nonvolatile Reconfigurable Phase-change-materials Integrated Silicon Photonics

Nonvolatile Reconfigurable Phase-change-materials Integrated...

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Kai Xu Maoliang Wei Bo Tang Junying Li Yiting Yun Kunhao Lei Yingchun Wu Lan Li Hongtao Lin State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou China Institute of Microelectronics of the Chinese Academy of Sciences Beijing China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou China Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

The emergence of integrated photonic technology provides an attractive solution of high speed, broad bandwidth and strong parallelism for large-scale information transmission and processing in interconnection, communication and computing. Reconfigurability is necessary for photonic processors to adapt varieties of application scenarios in the fields of data exchange, microwave photonics and neural networks. As yet, thermo-optical effect and carrier plasma dispersion effect are the most common phenomena for optical modulation. However, the volatility not only requires continuous power supply to maintain the devices’ state, but also accompanies with serious thermal crosstalk induced by active regions. Hence, the nonvolatile methods that can reconfigure and fix on the current state for a long time after a single external excitation are considered as one of the significant technologies in the next generation of integrated photonics. Nonvolatile reconfiguration has been achieved through trapped-charge effect, bistable micro-electromechanical system (MEMS) with nano-latch mechanism and ferroelectric materials, which suffer from high loss, lower stability and complex process flow. Chalcogenide phase change materials (PCM) have become a promising method to realize compact and nonvolatile reconfigurable integrated photonic devices due to the high optical constant contrast between amorphous state and crystalline state, superiorly stable property and low temperature deposition possibility. Here, we developed a monolithic back-end-of-line integration technology of PCM in silicon photonics, supporting "Zero-change" heterogeneous integration platform at wafer scale. On this basis, nonvolatile integrated photonic devices with excellent performance have been fabricated. It lays a foundation for improving the energy efficiency and integration density of integrated photonic processors and suppressing thermal crosstalk between integrated photonic devices.

关键词： Phase change materials Performance evaluation Optical losses Program processors Optical resonators Crosstalk Silicon photonics

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Designing hard wear-resistant conductors by introducing high-plasma-energy heterogeneous metals into transition metal nitrides

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Journal of Materials Science & technology 2023年第26期157卷 213-219页

作者： Yuankai Li Chaoquan Hu Yao Wu Zhenan Qiao Yifan Cheng Zhiqing Gu Gang Gao Weitao Zheng State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationSchool of Materials Science and EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China SINOPEC Star Co.Ltd. Beijing 100083China Key Laboratory of Medical Electronics and Digital Health of Zhejiang Province College of Information Science and EngineeringJiaxing UniversityJiaxing 314001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China

*** Hard and wear-resistant conductors(HWCs)refer to functional films with simultaneously high hardness,high wear resistance,and good electrical *** have important applica-tions such as next-generation sliding electrical contacts,high-end conductive probe-tip,and oval hole guides for the precision rolling mill[1-4],which has drawn extensive research ***,it is still challenging to integrate high hardness,super wear resis-tance,and high electrical conductivity in one ***-ally,researchers have mainly alloyed the highly conductive met-als Cu,Au,and Pt to improve their hardness and wear resistance.

关键词： wear high electrical

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A Novel Extensible Simulation Framework for CXL-Enabled systems

arXiv

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arXiv 2024年

作者： An, Yuda Yi, Shushu Mao, Bo Li, Qiao Zhang, Mingzhe Zhou, Ke Xiao, Nong Sun, Guangyu Wang, Xiaolin Luo, Yingwei Zhang, Jie Computer Hardware and System Evolution Laboratory Peking University China Computer Hardware and System Evolution Laboratory Xiamen University China Institute of Information Engineering Chinese Academy of Sciences China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology China Sun Yat-sen University China Beijing Advanced Innovation Center for Integrated Circuits China

Compute Express Link (CXL) serves as a rising industry standard, delivering high-speed cache-coherent links to a variety of devices, including host CPUs, computational accelerators, and memory devices. It is designed to promote system scalability, enable peer-to-peer exchanges, and accelerate data transmissions. To achieve these objectives, the most recent CXL protocol has brought forth several innovative features, such as port-focused routing, device-handled coherence, and PCIe 6.0 compatibility. However, due to the limited availability of hardware prototypes and simulators compatible with CXL, earlier CXL research has largely depended on emulating CXL devices using remote NUMA nodes. Unfortunately, these NUMA-based emulators have difficulties in accurately representing the new features due to fundamental differences in hardware and protocols. Moreover, the absence of support for non-tree topology and PCIe links makes it complex to merely adapt existing simulators for CXL simulation. To overcome these problems, we introduce ESF, a simulation framework specifically designed for CXL systems. ESF has been developed to accurately reflect the unique features of the latest CXL protocol from the ground up. It uses a specialized interconnect layer to facilitate connections within a wide range of system topologies and also includes key components to carry out specific functions required by these features. By utilizing ESF, we thoroughly investigate various aspects of CXL systems, including system topology, device-handled coherence, and the effects of PCIe characteristics, leading to important findings that can guide the creation of high-performance CXL systems. The ESF source codes are fully open-source and can be accessed at https://***/r/ESF-1CE3. Copyright © 2024, The Authors. All rights reserved.

关键词： HTTP

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Pre-Equalization Aided Grant-Free Massive Access in Massive MIMO system

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IEEE Transactions on Vehicular technology 2025年

作者： Wang, Yueqing Mei, Yikun Gao, Zhen Wan, Ziwei Ning, Boyu Mi, De Muhaidat, Sami School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Institute of Technology MIIT Key Laboratory of Complex-Field Intelligent Sensing Beijing100081 China Yangtze Delta Region Academy Jiaxing314019 China Beijing Institute of Technology Advanced Technology Research Institute Jinan250307 China University of Electronic Science and Technology of China National Key Laboratory of Wireless Communications Chengdu611731 China Birmingham City University School of Computing and Digital Technology BirminghamB55JU United Kingdom Khalifa University KU 6 G Research Center Department of Computer and Information Engineering Abu Dhabi United Arab Emirates

The spatial diversity and multiplexing advantages of massive multi-input-multi-output (mMIMO) can significantly improve the capacity of massive non-orthogonal multiple access (NOMA) in machine type communications. However, state-of-the-art grant-free massive NOMA schemes for mMIMO systems require accurate estimation of random access channels to perform activity detection and the following coherent data demodulation, which suffers from excessive pilot overhead and access latency. To address this, we propose a pre-equalization aided grant-free massive access scheme for mMIMO systems, where an iterative detection scheme is conceived. Specifically, the base station (BS) firstly activates one of its antennas (i.e., beacon antenna) to broadcast a beacon signal, which facilitates the user equipment (UEs) to perform downlink channel estimation and pre-equalize the uplink random access signal with respect to the channels associated with the beacon antenna. During the uplink transmission stage, the BS detects UEs' activity and data by using the proposed iterative detection algorithm, which consists of three modules: coarse data detection (DD), data-aided channel estimation (CE), and fine DD. In the proposed algorithm, the joint activity and DD is firstly performed based on the signals received by the beacon antenna. Subsequently, the DD is further refined by iteratively performing data-aided CE module and fine DD module using signals received by all BS antennas. Our simulation results demonstrate that the proposed scheme outperforms state-of-the-art mMIMO-based grant-free massive NOMA schemes with the same access latency. © 1967-2012 IEEE.

关键词： Channel estimation

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Enhancing Flexibility of Smart Bioresorbable Vascular Scaffolds Through 3d Printing Using Polycaprolactone and Polylactic Acid

SSRN

引用

SSRN 2024年

作者： Wei, Jinlian Oyunbaatar, Nomin-Erdene Jeong, Yun-Jin Park, Jongsung Kim, Su-Hwan Kwon, Kyeongha Lee, Heonzoo Won, Yonggwan Kim, Dong-Su Lee, Dong-Weon School of Mechanical Engineering Chonnam National University Gwangju61186 Korea Republic of Department of Automatic System Chosun College of Science & Technology Gwangju61453 Korea Republic of Department of Precision Mechanical Engineering Kyungpook National University Gyeongsangbuk-do Sangju37224 Korea Republic of School of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Intelligent Electronics and Computer Engineering Chonnam National University Gwangju61186 Korea Republic of Gwangju61012 Korea Republic of

With the growing use of stent implantations, the risk of in-stent restenosis represents a major concern for cardiovascular patients. Herein, we propose a hybrid bioresorbable vascular scaffold (H-BVS) integrated with a wireless sensor that could enable significant advances in cardiovascular therapeutics. The H-BVS was manufactured using a state-of-the-art customized 3D printer equipped with dual nozzles to ensure a synergistic combination of polycaprolactone and polylactic acid. Moreover, the H-BVS was integrated with a wireless, battery-less LC-type pressure sensor for real-time monitoring of in-stent restenosis. This wireless sensor was meticulously connected with the H-BVS framework through engineered microstructures, which not only ensured a robust bond but also significantly enhanced the overall integrity and functionality of the device. Furthermore, the combination of the H-BVS and sensor was optimized to exhibit superior bending flexibility and radial strength, which are key factors in ensuring effectiveness and patient safety. The feasibility of the smart H-BVS (SH-BVS) was verified through comprehensive testing within a phantom system designed to simulate real blood flow conditions. We believe that the potential of the SH-BVS system to revolutionize patient monitoring and treatment strategies in the cardiovascular healthcare domain cannot be overstated. © 2024, The Authors. All rights reserved.

关键词： Biodegradable polymers

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A New Integrated Fuzzy Optimization Approach for Sustainable Supply Chain Planning Subjected to Sustainability and Uncertain Environments

A New Integrated Fuzzy Optimization Approach for Sustainable...

引用

Computer Science and Data engineering (CSDE), IEEE Asia-Pacific Conference on

作者： Noppasorn Sutthibutr Kunihiko Hiraishi Navee Chiadamrong Suttipong Thajchayapong School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of Technology (SIIT) Thammasat University Pathum Thani Thailand School of Information Science Japan Advanced Institute of Science and Technology (JAIST) Ishikawa Japan Data Science and Analytics Research National Electronics and Computer Technology Center Pathum Thani Thailand

This study proposes an integrated fuzzy optimization approach for sustainable supply chain planning subjected to sustainability and uncertain environments. The proposed approach combines the concept of Chance-Constrained Programming (CCP) with Intuitionistic Fuzzy Linear Programming (IFLP) that decision makers can control risk violation of fuzzy constraints as well as consider satisfaction and non-satisfaction levels simultaneously. The effectiveness of the proposed approach is demonstrated through a case study by minimizing total costs and maximizing supplier's social and environmental scores where costs and customer demands are imprecise. Our comparative result clearly shows that the obtained solution outperforms the result from the traditional integrated fuzzy optimization approach. The advantages of the proposed approach can assist decision-makers to prepare and take necessary actions for future uncertainty, leading to sustainability.

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