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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Yifei Sun Lingxiao Huang Junrui Wang Meng Liu Suchuang Di Simin Yang Hang Zhang Cen Zhang Ronglin Tang State Key Laboratory of Resources and Environment Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China State Key Laboratory of Efficient Utilization of Arid and Semi-Arid Arable Land in Northern China Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing China Beijing Water Science and Technology Research Institute Beijing China

ISBN: (数字)9798350360325

ISBN: (纸本)9798350360332

Accurate quantification of ecosystem water use efficiency (eWUE), defined as the ratio of gross primary production (GPP) and evapotranspiration (ET), is vital to deepen our understanding of global water and carbon cycles. However, the influence of varying abiotic and biotic factors on GPP and ET is still not thoroughly understood, and thus accurate estimation of GPP and ET is still challenging, which may introduce uncertainties into eWUE. Here, we applied the random forest (RF) machine learning model to directly estimate the 8-day observed eWUE collected from the 197 globally distributed flux sites involved in the FLUXNET2015 dataset. Additionally, the RF model was also intercompared with the widely used Moderate Resolution Imaging Spectroradiometer (MODIS) and Penman-Monteith-Leuning version 2 (PMLv2) products. Our results show that the RF model could well reproduce the 8-day observed eWUE, as indicated by the root mean square error (RMSE) = 1.01 g C Kg -1 H2O, the coefficient of determination (R 2 ) = 0.66, and the mean prediction error (Bias) = 0.00 g C Kg -1 H2O. More importantly, the RF model showed considerable improvements over the MODIS and PMLv2 products in simulating 8-day eWUE, with decreasing the RMSE by 1.03 g C Kg -1 H2O and 0.86 g C Kg -1 H2O, increasing the R 2 by 0.65 and 0.49, and reducing the Bias by 0.64 g C Kg -1 H2O and 0.32 g C Kg -1 H2O, respectively. This study indicates a promising avenue for using machine learning models to simulate eWUE directly.

关键词： Water Radio frequency Accuracy Uncertainty Ecosystems Estimation Sensors

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Incremental Learning Using Feature Labels for Sar Automatic Target Recognition

SSRN

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SSRN 2022年

作者： Hu, Chao Hao, Ming Wang, Wenying Yang, Yong Wu, Daoqing Nanjing Institute of Electronic Technology Nanjing210019 China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

Although deep neural network technology brings high recognition accuracy to the field of synthetic aperture radar image-based automatic target recognition, it also produces the catastrophic forgetting problem. Here we propose a new incremental learning method that can extract more information about old data. Based on the rehearsal method, our method adds extra linear layers after the feature extractor of the network before training on new incremental data and uses the network to generate distilled labels for incremental training. Through experiments on the MSTAR dataset, we conclude that, when the old model has good performance, our method has better performance than other typical incremental learning methods. © 2022, The Authors. All rights reserved.

关键词： Synthetic aperture radar

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Investigation of the Ion Thermal Effect on Tin Contamination in Low-Temperature Hydrogen Plasma Cleaning

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SSRN 2024年

作者： Wang, Sishu Wu, Andong Lu, Qipeng Song, Yuan Yu, Xingang Wei, Jianjun Gou, Fujun Ye, Zongbiao Pu, Guo Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China State Key Laboratory of Applied Optics Changchun China Key Laboratory of Optical System Advanced Manufacturing Technology Chinese Academy of Sciences Changchun China School of Engineering Science University of Chinese Academy of Science Beijing100049 China Institute of Atomic and Molecular Physics Sichuan University Chengdu610064 China

The tin contamination is one of the crucial issues faced by Sn-based Extreme Ultraviolet (EUV) light sources and the ITER fusion program. Based on the synergistic effect of hydrogen atoms and ions on tin atoms (generating SnH4), the tin contaminations would be expected to achieve efficient and non-destructive cleaning on the multilayer mirror (MLM) or first mirror (FM) surface by its self-discharge hydrogen plasma cleaning. A comprehensive evaluation of the surface ion energy distribution of MLM was conducted at 1 W, considering the influence of plasma sheath on ion energy. The ion energy distribution at the electrode surface is 23-40 eV and mainly concentrates at 32 eV. The calculation results indicate that the thermal effect of ions on tin (about 307.2 kJ/mol) is higher than the melting enthalpy of tin (7.08 kJ/mol), which could be caused by the local melting of tin particles, as evidenced by the apparent changes in morphology observed after plasma cleaning at 1 W. The comparative experiments of hydrogen atom cleaning, annealing, and re-deposition confirm that the ion-induced thermal effect is the leading cause of tin particle deformation. © 2024, The Authors. All rights reserved.

关键词： Ions

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Continuity Scaling: A Rigorous Framework for Detecting and Quantifying Causality Accurately

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Research 2022年第4期2022卷 137-146页

作者： Xiong Ying Si-Yang Leng Huan-Fei MaD Qing Nie Ying-Cheng Lai Wei Lin School of Mathematical Sciences SCMSand SCAMFudan UniversityShanghai 200433China Research Institute for Inteligent Complex Systems CCSBand LCNBIFudan UniversityShanghai 200433China State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institutes of Brain ScienceFudan UniversityShanghai 200032China Institute of AI and Robotics Academy for Engineering and TechnologyFudan UniversityShanghai 200433China School of Mathematical Sciences Soochow UniversitySuzhou 215006China Department of Mathematics Department of Developmental and Cll BiologyAnd NSF-Simons Center for Multiscale Cell Fate ResearchUniversity of CaliforniaIrvineCA 92697-3875USA School of Electrical ComputerAnd Energy EngineeringArizona State UniversityTempeArizona 85287-5706USA Shanghai Artificial Intelligence Laboratory Shanghai 200232China

Data-based detection and quantification of causation in complex,nonlinear dynamical systems is of paramount importance to science,engineering,and *** by the widely used methodology in recent years,the cross-map-based techniques,we develop a general framework to advance towards a comprehensive understanding of dynamical causal mechanisms,which is consistent with the natural interpretation of *** particular,instead of measuring the smoothness of the cross-map as conventionally implemented,we define causation through measuring the scaling law for the continuity of the investigated dynamical system *** uncovered scaling law enables accurate,reliable,and eficient detection of causation and assessment of its strength in general complex dynamical systems,outperforming those existing representative *** continuity scaling-based framework is rigorously established and demonstrated using datasets from model complex systems and the real world.

关键词： dynamical scaling continuity

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Wavelength Allocation and Dispersion Penalty Analysis of 50G PON Coexisting with EPON

Wavelength Allocation and Dispersion Penalty Analysis of 50G...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yang Zou Chenghao Chay Zhenfeng Xue Suyi Wang Qiongxia Shen Rui Li Ming Jiang Dezhi Zhang Xiaoxiao Dai Zhijun Yan Qi Yang Deming Liu National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Fiberhome Telecommunication Technologies Co. Ltd. Wuhan China State Key Laboratory of Optical Fiber and Cable Manufacture Technology China Telecom Research Institute Beijing China Hubei Optical Fundamental Research Center Wuhan China Jinyinhu Laboratory Wuhan China

To address the wavelength collision between 50G PON and EPON, this paper discusses the power budget penalty when changing the downstream wavelength of 50G PON with varying EML chirp factors and DSP combinations.

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Chirp Simulation Asia IEEE 802.3 Standard EPON Optical fiber communication Complexity theory Resource management Dispersion Photonics

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Tunable cavity coupling to spin defects in 4H-silicon-carbide-on-insulator platform

arXiv

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arXiv 2024年

作者： Bao, Tongyuan Luo, Qi Yin, Ailun Zhang, Yao Hu, Haibo Liu, Zhengtong Xiao, Shumin Ou, Xin Zhou, Yu Song, Qinghai Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen518055 China Pengcheng Laboratory Shenzhen518055 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Shenzhen518045 China The Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

Silicon carbide (SiC) has attracted significant attention as a promising quantum material due to its ability to host long-lived, optically addressable color centers with solid-state photonic interfaces. The CMOS compatibility of 4H-SiCOI (silicon-carbide-on-insulator) makes it an ideal platform for integrated quantum photonic devices and circuits. While micro-ring cavities have been extensively studied in SiC and other materials, the integration of 4H-SiC spin defects into these critical structures, along with continuous mode tunability, remains unexplored. In this work, we demonstrate the integration of PL4 divacancy spin defects into tunable micro-ring cavities in scalable thin-film 4H-SiC nanophotonics. Comparing on- and off-resonance conditions, we observed an enhancement of the Purcell factor by approximately 5.0. This enhancement effectively confined coherent photons within the coupled waveguide, leading to a twofold increase in the ODMR (optically detected magnetic resonance) contrast and coherent control of PL4 spins. These advancements lay the foundation for developing SiC-based quantum photonic circuits. © 2024, CC BY.

关键词： Nanocrystals

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Traveling Salesman Problem and Undirected Graph Two-Point Shortest Path Problem Based on Sugarcane Harvester Path Planning

SSRN

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SSRN 2022年

作者： Zeng, Yue Liang, Ke Que, Wenshuai Gou, Xuanyuan Pan, Mingzhang Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical Engineering College of Mechatronic Engineering Guangxi University Nanning530004 China State Key Laboratory for Conservation and Utilization of Subtropical Agrobioresources Nanning530004 China

This study solves the path planning for sugarcane harvester *** grouping specific problems into two classes (the traveling salesman problem and the undirected graph two-point shortest path problem). The running effects of three common traveling salesman problem algorithms (genetic algorithm, immune algorithm, simulated annealing algorithm) fused with two undirected graph two-point shortest path problem algorithms (Dijkstra's algorithm, Floyd's algorithm) respectively in different plot division forms for the path planning problem of sugarcane harvester are analyzed. By comparing the path length, operation time, and path complexity of the run results of the six fusion algorithms, the best fusion algorithm type and related operation parameters are analyzed. The final results show that the fusion algorithms based on the immune algorithm and Floyd's algorithm have the best path planning results in different sizes and types of sugarcane planting plots. The specific thinking process and results of this study will provide important thinking directions and guidance for future path planning problems of sugarcane harvesters. © 2022, The Authors. All rights reserved.

关键词： Motion planning

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Effect of intermittent aeration mode on nitrogen concentration in the water column and sediment pore water of aquaculture ponds

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Journal of Environmental Sciences 2020年第4期32卷 331-342页

作者： Dantong Zhu Xiangju Cheng David J.Sample Mohammad Nayeb Yazdi State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou 510640China School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China Department of Biological System Engineering Virginia Polytechnic Institute and State UniversityVirginia Beach 23455United States

Nitrogen in pond sediments is a major water quality concern and can impact the productivity of *** oxygen is an important factor for improving water quality and boosting fish growth in aquaculture ponds,and plays an important role in the conversion of ammonium-nitrogen(NH4-N)to nitrite-nitrogen(NO2--N)and eventually nitrate-nitrogen(NO3--N).A central goal of the study was to identify the best aeration method and strategy for improving water quality in aquaculture *** conducted an experiment with six tanks,each with a different aeration mode to simulate the behavior of aquaculture *** results show that a 36 hr aeration interval(Tc=36 hr:36 hr)and no aeration resulted in high concentrations of NH4-N in the water *** a 12 hr interval time(Tc=12 hr:12 hr)resulted in higher NO2--N and NO3--N concentrations than any other aeration *** from an 8 hr interval time(Tc=8 hr:8 hr)and 24 hr interval time(Tc=24 hr:24 hr)were comparable with those of continuous aeration,and had the benefit of being in use for only half of the time,consequently reducing energy consumption.

关键词： Intermittent aeration Nitrogen Water column Sediment resuspension and release Sediment Sediment pore water

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The Aging Characteristics of Resistance Rivet Welded Aluminum/Steel Joints

SSRN

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SSRN 2023年

作者： Lou, Ming Niu, Sizhe Ma, Yunwu Shan, He Yang, Bingxin Li, Yongbing Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai200240 China School of Mechanical Engineering Shandong University of Technology Zibo255000 China

Resistance rivet welding (RRW) has been demonstrated as a viable alternative to join aluminum (Al) alloy and ultra-high strength steel (UHSS). In automobile industry, paint baking under 150-180 °C is an essential process, and thus the aging characteristics of Al/UHSS RRW joints is investigated for the first time in this paper. Microstructure studies have shown that the aging treatment does not change the phase composition of the Al/steel mixed nugget still remaining the ferrite structure, while the precipitation, growth and dissolution occur for the microstructure of Al alloy varying with the distance from the rivet. Mechanical tests revealed that for interfacial fracture joints, the peak load rose slightly, while for button pullout fracture joints, the maximum peak load dramatically increased by 29% with the prolonged aging time. The improvement in the nugget strength after aging can be attributed to the relaxation of the residual stress. In addition, interestingly, the accelerated artificial aging is discovered firstly in this Al/steel RRW joint. The phenomenon can be attributed to the higher solid solubility of Mg and Si in softening zone of Al sheet, resulting in faster and more precipitation during the aging treatment. The block shear model analysis suggested that the Canadian Standards Association could provide a more reasonable calculation, which showed that the shear failure was mainly determined by the yield of the gross shear plane, and the tension plane failed because of tensile rupture during the lap-shear test. © 2023, The Authors. All rights reserved.

关键词： High strength alloys

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The Realization and Application of Dispatch Training Simulator based on Multi-machine technology 5

The Realization and Application of Dispatch Training Simulat...

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5th IEEE Advanced Information technology, Electronic and Automation Control Conference, IAEAC 2021

作者： Wang, Gang Wang, Baihuai Huang, Zhigang Fang, Xuezhen Xu, Xuan Sun, Zhengming Han, Yi State Grid Tianjin Electric Power Co. Ltd Tianjin China China Electric Power Research Institute Beijing Key Laboratory of Research and System Evaluation of Power Dispatching Automation Technology Beijing China

ISBN: (纸本)9781728180281

Traditional dispatcher training simulator (DTS) is commonly used for individual practice or joint anti-accident exercises that all people in single scenario. Problems includes the lack of sharing mechanism, fixed process and single machine control, which cannot support multiple people to train or do competitive exam in the same scenario simultaneously. In order to expand the use scenarios of DTS and solve the above problems, this paper suggests that applying the multi-machine technology to traditional DTS, including cloud storage technology through WEB to realize the sharing of exam cases, and establish an event-aware triggering mechanism and multi-machine centralized control technology of simulation virtual machines to achieve the individual process leading and multi-people competitive exam centralized control and interaction. Finally, by an simulation application instance of DTS in the multi-people competition and comparing with the traditional DTS functions and performance, the feasibility and practicability of DTS system in multi-person competitive exam scenario after implementing these new technologies are verified. © 2021 IEEE.

关键词： Process control

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