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arxiv 2024年

作者： Li, Jiapeng Shao, xiaodan Chen, Feng Wan, Shaohua Liu, Chang Wei, Zhiqiang Ng, Derrick Wing Kwan The College of Artificial Intelligence Southwest University Chongqing400715 China The Brain-Inspired Computing and Intelligent Control Key Laboratory Southwest University Chongqing400715 China The Key Laboratory of Luminescence Analysis and Molecular Sensing Southwest University Chongqing400715 China The Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China The School of Mathematics and Statistics Xi'an Jiaotong University Xi'An710049 China The Peng Cheng Laboratory Guangdong Shenzhen518055 China Guangdong Guangzhou510555 China The Department of Computer Science and Information Technology La Trobe University MelbourneVIC3150 Australia The School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW2052 Australia

Integrated sensing and communication (ISAC) is envisioned as a key pillar for enabling the upcoming sixth generation (6G) communication systems, requiring not only reliable communication functionalities but also highly accurate environmental sensing capabilities. In this paper, we design a novel networked ISAC framework to explore the collaboration among multiple users for environmental sensing. Specifically, multiple users can serve as powerful sensors, capturing back scattered signals from a target at various angles to facilitate reliable computational imaging. Centralized sensing approaches are extremely sensitive to the capability of the leader node because it requires the leader node to process the signals sent by all the users. To this end, we propose a two-step distributed cooperative sensing algorithm that allows low-dimensional intermediate estimate exchange among neighboring users, thus eliminating the reliance on the centralized leader node and improving the robustness of sensing. This way, multiple users can cooperatively sense a target by exploiting the block-wise environment sparsity and the interference cancellation technique. Furthermore, we analyze the mean square error of the proposed distributed algorithm as a networked sensing performance metric and propose a beamforming design for the proposed network ISAC scheme to maximize the networked sensing accuracy and communication performance subject to a transmit power constraint. Simulation results validate the effectiveness of the proposed algorithm compared with the state-of-the-art algorithms. Copyright © 2024, The Authors. All rights reserved.

关键词： Beamforming

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Suppressing Stick-Slip Vibration of Drill-String System Subject to Actuator Saturation

Suppressing Stick-Slip Vibration of Drill-String System Subj...

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第40届中国控制会议

作者： Zhaoqing He Chengda Lu Min Wu Jun Gao School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education CCTEG Xi'an Research Institute

In this paper, the actuator saturation of drill-rig is considered in the mitigation of stick-slip vibration of the drill-string system. Firstly, the dynamic of stick-slip vibration is described by the combination of a multi-degree-of-freedom drill-string model and a bit-rock interaction model. To suppress stick-slip vibration while reducing the effect of saturation on control performance, a dynamic output feedback controller with an anti-windup compensator is introduced. Then, stability analysis of the resulting closed-loop system is carried out. By solving an optimization problem, the gain matrix of the anti-windup compensator is obtained. Finally, a case study is used to show the effectiveness of the method.

关键词： Drill-string system actuator saturation stick-slip vibration anti-windup compensator

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Influence of Strain Rates and Aging Time on Microstructure and Hardness of Integrally Compressed 6082 Aluminum Alloy

SSRN

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SSRN 2023年

作者： Hu, Zhili Zheng, Jia Pang, Qiu Sun, Qian Zhao, Ning Hubei Long Zhong laboratory Hubei Xiangyang441000 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China Hubei Research Center for New Energy & Intelligent Connected Vehicle Wuhan University of Technology Wuhan430070 China Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Wuhan430081 China National & Local Joint Engineering Laboratory for Special Titanium Alloy Pressing Technologies Western Superconducting Technologies Co. Ltd. Xi’an710018 China

In this study, an in-depth analysis of the microstructure and hardness of 6082 aluminum alloy under a novel solution-forging integrated process is conducted by performing a series of isothermal uniaxial compression tests at various strain rates and aging durations. The results indicate that the highest hardness achieved is 125 HV at peak aging with a forming strain rate of 10 s-1, a 16.1% improvement compared to the conventional T6 forming process. The deformation shortens the subsequent peak aging time from 8 hours in the conventional process to 6 hours. In addition, the composite phases, including short-range disordered B'/U2 phase and composite phase with multiple structures, are also discovered under the condition of a strain rate of 10 s-1 and 6 hours of aging. While, as the strain rate increases, the degree of recrystallization decreases and then the refined grain size increases, accompanied by the increase in dislocation density. For the integrated process, the deformation microstructure inherited to the aging state, including grain morphology and dislocation density, as well as the aging precipitated phase, especially for the formation of composite phase, are the main reasons for the higher hardness after aging than the traditional T6 state. © 2023, The Authors. All rights reserved.

关键词： Strain rate

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Resource-efficient Direct Characterization of General Density Matrix

arXiv

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arxiv 2023年

作者： Xu, Liang Zhou, Mingti Tao, Runxia Zhong, Zhipeng Wang, Ben Cao, Zhiyong xia, Hongkuan Wang, Qianyi Zhan, Hao Zhang, Aonan Yu, Shang Xu, Nanyang Dong, Ying Ren, Changliang Zhang, Lijian College of Metrology and Measurement Engineering China Jiliang University Hangzhou310018 China National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulation College of Engineering and Applied Sciences Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Research Center for Quantum Sensing Zhejiang Lab Hangzhou310000 China School of Electronic Control Chang’an University Xi’an710064 China Quantum Optics and Laser Science Blackett Laboratory Imperial College London Prince Consort Rd LondonSW7 2AZ United Kingdom Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China

Sequential weak measurements allow for the direct extraction of individual density-matrix elements, rather than relying on global reconstruction of the entire density matrix, which opens a new avenue for the characterization of quantum systems. Nevertheless, extending the sequential scheme to multi-qudit quantum systems is challenging due to the requirement of multiple coupling processes for each qudit and the lack of appropriate precision evaluation. To address these issues, we propose a resource-efficient scheme (RES) that directly characterizes the density matrix of general multi-qudit systems while optimizing measurements and establishing a feasible estimation analysis. In the RES, an efficient observable of the quantum system is constructed such that a single meter state coupled to each qudit is sufficient to extract the corresponding density-matrix element. An appropriate model based on the statistical distribution of errors is utilized to evaluate the precision and feasibility of the scheme. We have experimentally applied the RES to the direct characterization of general single-photon qutrit states and two-photon entangled states. The results show that the RES outperforms sequential schemes in terms of efficiency and precision in both weak- and strong-coupling scenarios. This work sheds new light on the practical characterization of large-scale quantum systems and the investigation of their non-classical properties. © 2023, CC BY.

关键词： Photons

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Ca-Doped La0.5Ba0.5FeO3-δAs an Efficient Cathode Material for Proton-Conducting Direct Ammonia Fuel Cells

ACS Electrochemistry

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ACS Electrochemistry 2024年第1期1卷 63-72页

作者： Shenglin Liu Menglin Wu Chaozhong Wang Yihang Li Tong Liu Jiupai Ni John Irvine Chengsheng Ni College of Resources and Environment Southwest University Chongqing 400715 China；Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 211189 Jiangsu China College of Resources and Environment Southwest University Chongqing 400715 China；Institute of Energy Hefei Comprehensive National Science Center Hefei Anhui 230031 P. R. China College of Resources and Environment Southwest University Chongqing 400715 China Interdisciplinary Research Center of Smart Sensors Academy of Advanced Interdisciplinary Research Xidian University Xi’an 710071 P. R. China Key Laboratory of Green Chemical Process of Ministry of Education Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan 430205 China College of Resources and Environment Southwest University Chongqing 400715 China；School of Chemistry University of St Andrews St Andrews KY16 9ST United Kingdom

Sr or Ca doping on the Ba site of layered perovskites is reported to increase oxygen reduction reaction catalytic activity, but the underlying mechanism of this phenomenon for the protonic cell is not clear. In this research, Ca containing La0.5(Ba0.5–xCax)FeO3-δ(0≤x≤0.3) perovskites are explored as cathodes for proton-conducting direct ammonia fuel cells. La0.5Ba0.5FeO3-δ(LBF) has mixed cubic and tetragonal phases with cation ordering, and the Ca doping generally increases the oxide-ion conductivity because it could increase the stability of random cation distribution on the A site and facilitate the formation of oxide ion vacancy in the layer according to the density-function theory (DFT) calculation. The surface exchange coefficient (2.00 × 10–5cm s–1) and the chemical diffusion coefficient (4.01 × 10-10cm2s–1) are enhanced to 8.56 × 10–5cm s–1and 7.37 × 10–9cm2s–1, respectively, when the Ca content increased from 0 to 30%. For electrochemical tests, the single cell with a cathode of cubic La0.5(Ba0.45Ca0.05)FeO3−δbased on BaZr0.1Ce0.7Y0.2O3(BZCY) electrolyte shows a polarization resistance of 0.058 Ω cm2at 700 °C, imparting a peak power density of 682 mW cm–2under NH3fuel. The Ca2+doping abovex= 0.05 would decrease the cell output or stability for continuous operation in fuel-cell mode because of the decreased protonic conductivity that could localize the site for water production. This research highlights the effect of isovalent Ca2+doping on the Ba2+site and demonstrates the possibility for a proton conducting cathode for direct ammonia fuel cell.

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Polyvinyl chloride microplastics and drought co-exposure alter rice growth by affecting metabolomics and proteomics

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Science of the Total Environment 2024年 955卷 177002页

作者： Khan, Kiran Yasmin Ali, Barkat Ghani, Hafiz Usman Cui, xiaoqiang Luo, xiaohan Ali, Zeshan Ahmed, Waqar Tan, Jinglu Lysenko, Vladimir Guo, Ya Key Laboratory of Advanced Process Control for Light Industry Ministry of Education Jiangnan University Wuxi214122 China Food Science Research Institute National Agricultural Research Centre Islamabad44000 Pakistan Hebei Medical University Shijiazhuang050000 China School of Environmental Science and Engineering/Tianjin Key Lab of Biomass Waste Utilization Tianjin University Tianjin300072 China Ecotoxicology Research Program Institute of Plant and Environmental Protection National Agriculture Research Center Islamabad44000 Pakistan Department of Biomedical Biological & Chemical Engineering University of Missouri ColumbiaMO65211 United States Southern Federal University Academy of Biology and Biotechnology Rostov-on-Don344041 Russia International Joint Research Center for Intelligent Optical Sensing and Applications at Jiangnan University Wuxi214122 China

Microplastics, interacting with drought stress, have become threat to crops by altering soil environment. Currently, the effect of combined microplastic and drought stress on crop growth remain poorly understood. In this work, the mechanism of multi-stress responses was investigated under the exposure of polvinylchloride microplastic (PV) and drought (D) individually and in combination (DPV) on rice varieties Hanyou73 and Q280 through proteomics and metabolomic analysis. All treatments negatively affect chlorophyll content, antioxidant enzyme activities, rice grain composition, metabolome and proteomic profiling of both rice varieties. Full rice grain yield was decreased under all treatments except PV treatment in which it was increased in both rice varieties. DPV treatment shows the lowest grain yield and more adverse effects on metabolome by affecting glycerophospholipid metabolism, tryptophan metabolism and alanine, aspartate and glutamate metabolism. Soluble sugar contents were decreased in H73 but in Q280 increased by 159 % under DPV and 123 % in PV treatment, compared to their control group. The results from metabolomics illustrate that glycerophospholipid metabolism is commonly altered in both rice types under all treatments. PV and drought alone and in combination induce extensive alterations in proteomics of rice leaves especially impacting proteins related to binding, translation and photosynthetic process. The results reveal that PV and DPV treatments highly distort the abundance of metabolites and proteins in both rice types, demonstrating that microplastic toxicity effects on rice plants become more severe when combined with drought stress. © 2024 Elsevier B.V.

关键词： Drought Metabolite Polyvinyl chloride microplastic Protein Rice

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High detectivity photodetectors based on perovskite nanowires with suppressed surface defects

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Photonics Research 2020年第12期8卷 1862-1874页

作者： GUOHUI LI RUI GAO YUE HAN AIPING ZHAI YUCHENG LIU YUE TIAN BINING TIAN YUYING HAO SHENGZHONG LIU YUCHENG WU YANxiA CUI College of Physics and Optoelectronics Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of EducationKey Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Applied Surface and Colloid Chemistry MOEShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Laboratory for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Solution-processable,single-crystalline perovskite nanowires are ideal candidates for developing low-cost photodetectors,but their detectivities are limited due to a high level of unintentional *** the surfaceinitiated solution-growth method,we fabricated high-quality,single-crystalline,defects-suppressed MAPbI_(3) nanowires,which possess atomically smooth side surfaces with a surface roughness of 0.27 nm,corresponding to a carrier lifetime of 112.9 *** forming ohmic MAPbI_(3)∕Au contacts through the dry contact method,highperformance metal–semiconductor–metal photodetectors have been demonstrated with a record large linear dynamic range of 157 dB along with a record high detectivity of 1.2×10^(14) Jones at an illumination power density of 5.5 nW∕cm^(2).Such superior photodetector performance metrics are attributed to,first,the defects-suppressed property of the as-grown MAPbI_(3) nanowires,which leads to a quite low noise current in the dark,and second,the ohmic contact between MAPbI_(3) and Au interfaces,which gives rise to an improved responsivity compared with the Schottky contact *** realized high-performance MAPbI_(3) nanowire photodetector advances the development of low-cost photodetectors and has potential applications in weak-signal photodetection.

关键词： nanowires perovskite surface

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Preface

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2023年 492卷 v-vi页

作者： Luan, xiaoli He, Shuping Liu, Fei Key Laboratory of Advanced Process Control for Light Industry [Ministry of Education Institute of Automation Jiangnan University Jiangsu Wuxi China Key Laboratory of Intelligent Computing and Signal Processing [Ministry of Education School of Electrical Engineering and Automation Anhui University Anhui Hefei China

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Facial expression recognition based on deep residual network

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Journal of Computers (Taiwan) 2020年第2期31卷 12-19页

作者： Qu, Junsuo Zhang, Ruijun Zhang, Zhiwei Pan, Jeng-Shyang Xi'an Key Laboratory of Advanced Control and Intelligent Process School of Automation Xi'an University of Posts and Telecommunications Xi'an710061 China Innovation Lab Xi'an University of Posts and Telecommunications Xi'an710061 China School of Information Science and Engineering Fujian University of Technolgy Fuzhou350000 China

Low accuracy of facial expression recognition for traditional methods, a facial expression recognition algorithm is proposed. Using the deep residual network model as the feature extractor, the residual block of the residual network is improved to enhance the information flow in the deep network. During training, apply some pre-processing techniques to extract only expression specific features from a face image and explore the presentation order of the samples and use softmax to classify and identify the extracted feature vectors. The experimental results show that a higher recognition rate is obtained on FER-2013. © 2020 Computer Society of the Republic of China. All rights reserved.

关键词： Face recognition

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Modulation format identification in fiber communications using single dynamical node-based photonic reservoir computing

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Photonics Research 2021年第1期9卷 I0010-I0017页

作者： QIANG CAI YA GUO PU LI ADONIS BOGRIS KALAN SHORE YAMEI ZHANG YUNCAI WANG Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China School of Electronics and Information Northwestern Polytechnical UniversityXi'an 710072China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai UniversityShanghai 200444China Department of Informatics and Computer Engineering University of West AtticaAthens 12243Greece School of Electronic Engineering Bangor UniversityWales LL571UTUK Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationNanjing University of Aeronautics and AstronauticsNanjing 210016China

We present a simple approach based on photonic reservoir computing(P-RC)for modulation format identification(MFI)in optical fiber *** an optically injected semiconductor laser with self-delay feedback is trained with the representative features from the asynchronous amplitude histograms of modulation *** simulations are conducted for three widely used modulation formats(on–off keying,differential phase-shift keying,and quadrature amplitude modulation)for various transmission situations where the optical signal-to-noise ratio varies from 12 to 26 d B,the chromatic dispersion varies from-500 to 500 ps/nm,and the differential group delay varies from 0 to 20 *** these situations,final simulation results demonstrate that this technique can efficiently identify all those modulation formats with an accuracy of>95%after optimizing the control parameters of the P-RC layer such as the injection strength,feedback strength,bias current,and frequency *** proposed technique utilizes very simple devices and thus offers a resource-efficient alternative approach to MFI.

关键词： fiber tuning computing

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