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Geophysical Evidence for Carbonate Platform Periphery Gravity Flows in the Xisha Islands,South China Sea

Journal of Ocean University of China 2022年第4期21卷 837-848页

作者： BAI Hongxin SUN Yue WANG Dawei WANG Weiwei WU Shiguo Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China University of Chinese Academy of Sciences Beijing 100049China College of Information and Control Engineering China University of PetroleumQingdao 266580China

High-resolution bathymetric and partial seismic data were utilized to determine the characteristics and distribution of mass-transport deposits(MTDs)in the Xisha area,North of the South China *** isolated carbonate platforms are found in this area,providing mass-wasting materials as a sediment source for *** MTDs in the study area were divided into three types(slide,slump,and debris flow)based on their rheological *** MTDs were mostly distributed at the toe of the carbonate platform slope,where a large amount of carbonate debris accumulated.A total of 32 MTDs were identified on the carbonate platform slopes.A systematic assessment of the MTD morphometric parameters showed that their total area covered 2225.2 km2,with the largest MTD covering 354.1 *** MTDs differ largely from the MTDs of other areas,especially in terms of sediment compositions and deposit *** and channels on the slope and reefs on the top of the platform act as sediment conduits and carbonate-producing sources,respectively,playing vital roles in the distribution and generation of gravity flow *** development model proposed in this work states that reefs disintegrate into carbonate debris and mix with seawater to form gravity flows,which scour the seafloor and accumulate at the downslope,eventually resulting in *** from these failures turn into gravity flows,flowing into submarine canyons and *** results of this research further our understanding of the development pattern of MTDs in a carbonate setting.

关键词： mass-transport deposit geomorphology analysis multibeam bathymetry carbonate platform sediment conduit

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A NTSMCLF Attitude Tracking controller for the Satellite with Flexible Accessories Based on the Stewart platform 42

A NTSMCLF Attitude Tracking Controller for the Satellite wit...

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42nd Chinese control Conference, CCC 2023

作者： Chen, Xixuan Zhu, He Yin, Junxiong Han, Yumeng Guo, Yanning Harbin Institute of Technology Department of Control Science and Engineering Harbin150001 China Shanghai Academy of Spaceflight Technology China

ISBN: (纸本)9789887581543

In this paper, a novel class of finite-time high precision satellites attitude tracking controller based on nonsingular terminal sliding mode control Lyapunov function (NTSMCLF) with the Stewart platform active vibration isolation is proposed. An active vibration algorithm for Stewart platform is designed to isolate the micro-vibration, which uses sliding mode variable Structure control (SMC) method. In order to suppress the influence of vibration on satellite, the dynamical model of Stewart platform considering the physical constraints, noise immunity and robustness of passive vibration isolation mechanical structures is designed. Considering the controller accuracy and infinite time convergence, the finite-time control Lyapunov function (CLF) high-precision attitude tracking control algorithm based on nonsingular terminal sliding mode (NTSM) is provided. The finite-time stability of the system is guaranteed. Numerical simulation results are provided to validate the effectiveness of proposed control method. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： controllers

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A facial synthesis of nitrogen-doped reduced graphene oxide quantum dot and its application in aqueous organics degradation

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Green Energy & Environment 2022年第3期7卷 440-448页

作者： He Zhao Juehua Wang Zhuangjun Fan Yongbing Xie Di Zhang Shanshan Sun Yi Zhang Hongbin Cao CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing Engineering Research Centre of Process Pollution ControlBeijing100190China University of Chinese Academy of Sciences Beijing100049China School of Materials Science and Engineering China University of Petroleum(East China)QingdaoShandong266580China

N-doped reduced graphene oxide quantum dots(N-rGQDs) have attracted more and more attention in efficient catalytic degradation of aqueous organic ***,the synthesis of N-rGQDs is generally a complex and high energy required process for the reduction and N-doping *** this study,a facile and green fabrication approach of N-rGQDs is established,based on a metal-free Fenton reaction without additional *** N structures of N-rGQDs play a significant role in the promotion of their catalytic *** N-rGQDs with relatively high percentage of aromatic nitrogen(NAr-rGQDs) perform excellent catalytic activities,with which the degradation efficiency of pollutant is enhanced by 25 *** functional theory(DFT) calculation also indicates aromatic nitrogen structures with electron-rich sites are prone to transfer electron,presenting a key role in the catalytic *** metal-free Fenton process provides a green and costeffective strategy for one-step fabrication of N-rGQDs with controllable features and potential environmental catalytic applications.

关键词： reaction quantum synthesis

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Variational Reconstruction and Simulation Experiments of Sea Surface Wind Field for Ocean Data Buoy

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Journal of Ocean University of China 2024年第3期23卷 577-582页

作者： LI Yunzhou HUANG Sixun YAN Shen SUN Xuejin QI Suiping WANG Zhongqiu TANG Xiaoyu College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Institute of Oceanographic Instrumentation Qilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Laoshan Laboratory Qingdao 266237China

The sea surface wind field is an important physical parameter in oceanography and *** the continuous refinement of numerical weather prediction,air-sea interface materials,energy exchange,and other studies,three-dimensional(3D)wind field distribution at local locations on the sea surface must be measured *** current in-situ observation of sea surface wind parameters is mainly achieved through the installation of wind sensors on ocean data ***,the results obtained from this single-point measurement method cannot reflect wind field distribution in a vertical direction above the sea ***,the present paper proposes a theoretical framework for the optimal inversion of the 3D wind field structure variation in the area where the buoy is *** variation analysis method is first used to reconstruct the wind field distribution at different heights of the buoy,after which theoretical analysis verification and numerical simulation experiments are *** results indicate that the use of variational methods to reconstruct 3D wind fields is significantly effective in eliminating disturbance errors in observations,which also verifies the correctness of the theoretical analysis of this *** findings of this article can provide a reference for the layout optimization design of wind measuring instruments in buoy observation systems and also provide theoretical guidance for the design of new observation buoys in the future.

关键词： moored buoy three-dimensional wind field distribution variational analysis wind field reconstruction

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Multi-Blockchain Based Data Trading Markets With Novel Pricing Mechanisms

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IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2222-2232页

作者： Juanjuan Li Junqing Li Xiao Wang Rui Qin Yong Yuan Fei-Yue Wang IEEE the State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China the College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao 266590China the School of Artificial Intelligence Anhui UniversityHefei 266114 the Qingdao Academy of Intelligent Industries Qingdao 230031China the School of Mathematics Renmin University of ChinaBeijing 100872China the State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 the Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China

In the era of big data,there is an urgent need to establish data trading markets for effectively releasing the tremendous value of the drastically explosive *** security and data pricing,however,are still widely regarded as major challenges in this respect,which motivate this research on the novel multi-blockchain based framework for data trading markets and their associated pricing *** this context,data recording and trading are conducted separately within two separate blockchains:the data blockchain(DChain) and the value blockchain(VChain).This enables the establishment of two-layer data trading markets to manage initial data trading in the primary market and subsequent data resales in the secondary ***,pricing mechanisms are then proposed to protect these markets against strategic trading behaviors and balance the payoffs of both suppliers and ***,in regular data trading on VChain-S2D,two auction models are employed according to the demand scale,for dealing with users’ strategic *** incentive-compatible Vickrey-Clarke-Groves(VCG)model is deployed to the low-demand trading scenario,while the nearly incentive-compatible monopolistic price(MP) model is utilized for the high-demand trading *** temporary data trading on VChain-D2S,a reverse auction mechanism namely two-stage obscure selection(TSOS) is designed to regulate both suppliers’ quoting and users’ valuation ***,experiments are carried out to demonstrate the strength of this research in enhancing data security and trading efficiency.

关键词： Auction data trading markets multi-blockchain pricing mechanisms

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Dosage- and site-dependent retention of black carbon and polycyclic aromatic hydrocarbons in farmland soils via long-term biochar addition

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Carbon Research 2024年第1期3卷 1-14页

作者： Zhang, Jun Wang, Yinghui Shi, Yameng Yang, Biwei Zhang, Aiping Du, Zhangliu Zhong, Guangcai Luo, Chunling Zhang, Gan Wang, Junjian Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Beijing100081 China College of Resources and Environmental Sciences China Agricultural University Beijing100193 China State Key Laboratory of Organic Geochemistry and Guangdong-Hongkong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China

Biochar, a soil conditioner containing significant amounts of polycyclic aromatic hydrocarbons (PAHs), has gained widespread popularity in agricultural practices due to its advantages in improving soil fertility and carbon sequestration. While biochar may increase soil black carbon (BC) and PAH contents, the quantitative accumulation of BC and PAHs in different soil environments under varying biochar addition dosages remains poorly understood. Here, we investigated the content and composition of black carbon (evaluated using benzene polycarboxylic acids, BPCAs) and PAHs in soils treated with different biochar addition dosages from two long-term experimental farmlands in Ningxia (5-year) and Shandong (7- and 11-year), China. Results showed that increasing cumulative biochar dosage caused elevated contents of black carbon and PAHs, accompanied by decreases in their retention efficiencies. Contrasting retention was observed between sites, with the Shandong site characterized by higher retention efficiencies of BPCAs and lower retention efficiencies of PAHs, possibly owing to its higher temperature, more sandy soil texture, less irrigation, and lower sunlight intensity. Despite both black carbon and PAHs originating from biochar and sharing similar condensed aromatic structures, there was no significant correlation between the contents of black carbon and PAHs, indicating distinct behaviors and fates of these compounds. These findings emphasize the importance of optimizing biochar addition dosages and considering site-specific environmental factors for effective soil black carbon sequestration through biochar application. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

关键词： Aromatization

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Brain-inspired Intelligent Robotics:Theoretical Analysis and Systematic Application

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Machine Intelligence Research 2023年第1期20卷 1-18页

作者： Hong Qiao Ya-Xiong Wu Shan-Lin Zhong Pei-Jie Yin Jia-Hao Chen The State Key Laboratory of Management and Control for Complex System Institute of AutomationChineseAcademyof SciencesBeijing100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China Chinese Academy of Science Center for Excellence in Brain Science and Intelligence Technology Shanghai 200031China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China

Traditional joint-link robots have been widely used in production lines because of their high precision for single *** the development of the manufacturing and service industries,the requirement for the comprehensive performance of robotics is *** types of bio-inspired robotics have been investigated to realize human-like motion control and manipulation.A study route from inner mechanisms to external structures is proposed to imitate humans and animals *** this idea,a brain-inspired intelligent robotic system is constructed that contains visual cognition,decision-making,motion control,and musculoskeletal *** paper reviews cutting-edge research in brain-inspired visual cognition,decision-making,motion control,and musculoskeletal *** software systems and a corresponding hardware system are established,aiming at the verification and applications of next-generationbrain-inspired musculoskeletal robots.

关键词： Brain-inspired intelligent robot software and hardware decision making muscle control cognitive intelligence.

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Exploring formation mechanism and source attribution of ozone during the 2019 Wuhan Military World Games:Implications for ozone control strategies

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Journal of Environmental sciences 2024年第2期136卷 400-411页

作者： Lei Zhang Lili Wang Runyu Wang Nan Chen Yuan Yang Ke Li Jie Sun Dan Yao Yuesi Wang Minghui Tao Yang Sun Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China University of the Chinese Academy of Sciences Beijing 100049China Hubei Ecological Environment Monitoring Center Station Wuhan 430072China Guizhou Research and Designing Institute of Environmental Sciences Guizhou Academy of Environmental Science and DesignGuiyang 550081China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China School of Environment Key Laboratory for Yellow River and Huai River Water Environment and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiang 453007China Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China

A series of emission reduction measures were conducted in Wuhan,Central China,to ensure good air quality during the 7th Military World Games(MWG)in October *** better understand the implications for ozone(O_(3))pollution control strategies,we applied integrated analysis approaches based on the de-weathered statistical model,parameterization methods,chemical box model,and positive matrix factorization *** the MWG,concentrations of O_(3),NO_x,and volatile organic compound(VOCs),OFP(O_(3)formation potential),L_(OH)(OH radical loss rate)were 83μg/m^(3),43μg/m^(3),26 ppbv,188μg/m^(3),and 3.9 s^(-1),respectively,which were 26%,18%,3%,15%,and 13%lower than pre-MWG values and 6%,39%,30%,33%,and 50%lower than post-MWG values,*** removing meteorological influence,O_(3)and its precursors during the MWG decreased largely compared with post-MWG values,and only O_(3),NO_(2),and oxygenated VOCs(OVOCs)declined compared with pre-MWG values,which revealed the emission reduction measures during the MWG played an important role for O_(3)*** six VOCs sources,the mass contributions of biomass burning and solvents usage during the MWG decreased largely compared with pre-MWG values.O_(3)production was sensitive to VOCs and the key species were aromatics,OVOCs,and alkenes,which originated mainly from solvents usage,biomass burning,industrial-related combustion,and vehicle *** O_(3)concentration during the strict control was mainly caused by OVOCs reduction due to biomass burning ***,the O_(3)abatement strategies of Wuhan should be focused on the mitigation of high-reactivity VOCs.

关键词： VOCs Ozone Wuhan Military World Games Source apportionment Relative incremental reactivity Random forest

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On Hierarchical Compensation Based Active Disturbance Rejection control for ACMM Problem of Spacecraft

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Journal of Systems science & Complexity 2023年第4期36卷 1480-1497页

作者： LIU Ping CHEN Seng XUE Wenchao LI Wenbo School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China LSC NCMISAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China Shenzhen Faroad Intelligent Equipment Co. LtdShenzhen 518105China School of Mathematics and Information Science Shaanxi Normal UniversityXi’an 710062China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Institute of Control Engineering China Academy of Space TechnologyBeijing 100086China

The attitude control and momentum management(ACMM)problem is quite fundamental for many spacecrafts including space stations,sky laboratories and *** of single attitude control problem,ACMM problem has to take account of both disturbance rejection and energy *** paper studies the ACMM problem for general spacecraft.A practical active disturbance rejection control architecture is proposed with hierarchical compensation to different kinds of uncertain dynamics or *** particular,by integrating RLS into ESO,the constant and sinusoidal disturbance terms to be compensated are ***,the LQR law is implemented to achieve the desired performance of control systems after disturbance ***,quantitative performances of the generalized ESO,the RLS algorithm and the closed-loop tracking system are rigorously ***,the results under 9-DOF semi-physical test environment show the effectiveness of our control method.

关键词： Active disturbance rejection control attitude control and momentum management extended state observer hierarchical compensation

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A Simplified Onboard Charger Designed for Compact Size Electric Vehicles 25

A Simplified Onboard Charger Designed for Compact Size Elect...

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25th International Middle East Power System Conference, MEPCON 2024

作者： Hossam, Youssef Wael, Omar Mohamed, Mennatullah Helmy, Mahmoud Ahmed, Omar Abdelsalam, Ibrahim Marei, Mostafa I. Arab Academy for Science Technology & Maritime Transport Electrical and Control Engineering Department Cairo Egypt Ain Shams University Faculty of Engineering Electrical Power and Machines Department Cairo Egypt

ISBN: (纸本)9798350379648

This paper presents a simplified design aimed to reducing the cost of on-board chargers for small-size electric vehicles. The proposed charger includes two stages. A front-end converter is utilized, in the first stage, to convert grid AC voltage to DC voltage while receiving a sinusoidal current at nearly unity power factor from the utility grid. In the second stage, a back-end converter which consists of a single active bridge DC-DC converter, is employed to provide galvanic isolation between the utility grid and the battery bank. In addition, the back-end converter is controlled to regulate the charger output voltage to meet the battery bank requirements. The dynamic performance of the proposed charger is verified using the PSCAD/EMTDC software package, demonstrating the successful transition from constant current charging mode to constant voltage charging mode. Furthermore, an experimental scaled-down prototype is implemented to verify the overall performance of the proposed charger. © 2024 IEEE.

关键词： Charging stations

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