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Experimental and numerical simulation study on forced ventilation and dust removal of coal mine heading surface

International Journal of Coal science & Technology 2024年第1期11卷 204-220页

作者： Haotian Zheng Bingyou Jiang Haoyu Wang Yuannan Zheng Key Laboratory of Industrial Dust Prevention and Control&Occupational Health and Safety Ministry of EducationAnhui University of Science and TechnologyHuainan232001China Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining Anhui University of Science and TechnologyHuainan232001China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan232001China

In order to study the problems of unreasonable airflow distribution and serious dust pollution in a heading surface,an experimental platform for forced ventilation and dust removal was built based on the similar *** the similar experiment and numerical simulation,the distribution of airflow field in the roadway and the spatial and temporal evolution of dust pollution under the conditions of forced ventilation were *** airflow field in the roadway can be divided into three zones:jet zone,vortex zone and reflux *** dust concentration gradually decreases from the head to the rear of the *** the forced ventilation conditions,there is a unilateral accumulation of dust,with higher dust concentrations away from the *** position of the equipment has an interception effect on the *** maximum error between the test value and the simulation result is 12.9%,which verifies the accuracy of the experimental *** research results can provide theoretical guidance for the application of dust removal technology in coal mine.

关键词： Heading surface Forced ventilation Airflow field Dust pollution

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A heuristic control framework for heavy-duty hexapod robot over complex terrain

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IET Cyber-Systems and Robotics 2022年第4期4卷 322-330页

作者： Jinmian Hou Hui Chai Yibin Li Yaxian Xin Wei Chen School of Control Science and Engineering Shandong UniversityJinanChina Engineering Research Center of Intelligent Unmanned System Ministry of EducationShandong UniversityJinanChina

The large and heavy-duty hexapod robot has strong motion stability and load capacity,which promises to have a wide range of application prospects in rescue and disaster ***-mode gait and static stability during walking make the hexapod robot adapt to more diverse terrains,while little research has been conducted on the motion control methods of heavy-duty hexapod robots in complex environments.A novel heuristic whole-body motion control framework for the heavy-duty hexapod robot to traverse complex terrain is *** splitting the legged locomotion into a single task,the whole-body motion could be planned in a reasonable *** terrain adaptation strategy is designed to improve the complex terrain *** reaction forces are then optimised based on single rigid-body dynamics with *** framework utilised simple but powerful heuristics to approximate complex dynamics and allows for a single set of parameters for all task *** results demonstrate the robustness and adaptability of the proposed framework.

关键词： legged locomotion robotics robots

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Thermal stability of soil organic carbon subjected to water erosion as a function of edaphic factors

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International Journal of Sediment research 2022年第1期37卷 26-36页

作者： Zhongwu Li Linhui Xiao Chuxiong Deng Zaijian Yuan Chen Liang Qian Xiong Zeting Li Xiaodong Nie College of Resources and Environmental Science Hunan Normal University Guangdong Engineering Center of Non-point Source Pollution Control Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Guangdong Institute of Eco-environmental Science & Technology Guangdong Academy of Sciences National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China

The stability of soil organic carbon （SOC）,as it relates to resistance to decomposition,is important for greenhouse gas emission and climate ***,the SOC stabilization and its related influencing factors subjected to water erosion remain *** objective of the current study was to determine the SOC stability under long-term water erosion and to investigate the link between SOC stability and edaphic *** samples from eroded,depositional,and control sites in a closed watershed in subtropical China were *** SOC concentration,carbon functional groups,soil physicochemical properties,and thermal stability of SOC were *** study results showed that the primary component of the SOC functional groups was O-alkyl carbon （reached 40%）,and its proportion has no significant difference among different *** TG-T50（the temperature at which 50%of the soil organic matter is lost） values indicated that the SOC thermal stability in the eroded topsoil was higher than that of the deposited *** carbon functional groups were lack of relation with SOC thermal stability（p>0.05）.However,the TG-T50was significantly positively correlated with the cation exchange capacity and silt,but remarkably negatively correlated with SOC,dissolved organic carbon,total nitrogen,sand,clay,p H,aluminum,specific surface area,and iron *** results indicated that the edaphic factors,which were strongly affected by micro-environment,are the main factors affecting thermal stability of organic *** SOC stabilization under the effects of long-term water erosion should be addressed from the perspective of the ecosystem.

关键词： Soil erosion Soil organic matter Thermogravimetry Preservation Stability

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An Optimal control-Based Distributed Reinforcement Learning Framework for A Class of Non-Convex Objective Functionals of the Multi-Agent Network

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IEEE/CAA Journal of Automatica Sinica 2023年第11期10卷 2081-2093页

作者： Zhe Chen Ning Li Department of Automation Shanghai Jiao Tong UniversityShanghai 200240 Key Laboratory of System Control and Information Processing Ministry of Education of ChinaShanghai 200240 Shanghai Engineering Research Center of Intelligent Control and Management Shanghai 200240China Department of Automation Tsinghua UniversityBeijing 100084China IEEE

This paper studies a novel distributed optimization problem that aims to minimize the sum of the non-convex objective functionals of the multi-agent network under privacy protection, which means that the local objective of each agent is unknown to others. The above problem involves complexity simultaneously in the time and space aspects. Yet existing works about distributed optimization mainly consider privacy protection in the space aspect where the decision variable is a vector with finite dimensions. In contrast, when the time aspect is considered in this paper, the decision variable is a continuous function concerning time. Hence, the minimization of the overall functional belongs to the calculus of variations. Traditional works usually aim to seek the optimal decision function. Due to privacy protection and non-convexity, the Euler-Lagrange equation of the proposed problem is a complicated partial differential ***, we seek the optimal decision derivative function rather than the decision function. This manner can be regarded as seeking the control input for an optimal control problem, for which we propose a centralized reinforcement learning(RL) framework. In the space aspect, we further present a distributed reinforcement learning framework to deal with the impact of privacy protection. Finally, rigorous theoretical analysis and simulation validate the effectiveness of our framework.

关键词： Distributed optimization multi-agent optimal control reinforcement learning(RL)

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A Nonlinear Input-Output-Based Model for Medium-Term Macroeconomic Risks Analysis for a Restructuring Economy with Limited Capacities 15th

A Nonlinear Input-Output-Based Model for Medium-Term Macroe...

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15th International Conference on Optimization and Applications, OPTIMA 2024

作者： Obrosova, Nataliia Spiridonov, Alexander Federal Research Center Computer Science and Control of the Russian Academy of Sciences 40 Vavilov st. Moscow119333 Russia

ISBN: (纸本)9783031791185

Nowadays global shifts in supply networks state the problem of building of new mathematical models to analyze medium-term macroeconomic risks of local economies in view of important economic restrictions and substitution of production factors. The methods are most importantly for catching-up economies with high rates of economic growth. In the paper we suggest the nonlinear generalization of Leontief Input-Output approach which supposes the possibility of inputs substitution in a production network in conditions of industrial capacity limitations. We state and investigate the competitive equilibrium evaluation problem in the space of intersectoral cash flows and prices as a pair of Young dual convex optimization problems. In the case of CES production we have an explicit solution that gives the equilibrium point of the problem, which includes the dependence on shadow prices which are the result of capacities lack. Based on official statistics we discuss the model application to evaluation of inflation risks in fast developing Kazakhstan economy. In terms of the model we analyze inflation risks caused by the possible lack of infrastructure services in scenario conditions based on the official macroeconomic forecast of Kazakhstan. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Inflation

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Convolution Algorithm for Evaluation of Probabilistic Characteristics of Resource Loss Systems with Signals 27th

Convolution Algorithm for Evaluation of Probabilistic Char...

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27th International Conference on Distributed Computer and Communication Networks, DCCN 2024

作者： Maslov, A.R. Sopin, E.S. Shorgin, S.Ya. Moscow Russia Institute of Informatics Problems Federal Research Center Computer Science and Control of Russian Academy of Sciences Moscow Russia

ISBN: (纸本)9783031808524

Resource loss systems (ReLS) with signals, in which arrival of a signal triggers resource reallocation of a customer, are often used in the performance analysis of the contemporary mobile networks, especially those that utilize high-frequency bands. An analytical solution for the stationary distribution of such systems is not obtained yet. Approximate calculation methods utilize the stationary distribution of ReLS without signals at the departure instants. In the paper, we develop an efficient convolution algorithm for evaluation of the probability metrics at the departure instants. In the case study, we demonstrate the effectiveness of the proposed algorithm in terms of execution time. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Markov chains

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research on Closed-Loop control Method of MEMS Disk Resonant Gyroscope Based on Dual-Modal Parametric Excitation 7

Research on Closed-Loop Control Method of MEMS Disk Resonant...

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7th IEEE Information Technology, Networking, Electronic and Automation control Conference, ITNEC 2024

作者： Di, Yichen Tang, Hao Zhou, Yi Yu, Zhuolin Zhou, Tong Su, Yan School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China Nanjing University of Science and Technology Jiangsu Research Center for Intelligent Navigation and Control of Complex Motion Nanjing China

ISBN: (纸本)9798350370782

Among the MEMS gyroscopes, MEMS disk gyroscopes exhibit high performance potential and broad development prospects. However, due to the small mass and detection capacitance of the MEMS gyroscopes, the detection sensitivity and the signal-to-noise ratio of the gyroscope are low. Moreover, the structural coupling and errors introduced by the manufacturing processing errors of the gyroscope can interfere with the angular rate detection. Parametric excitation is proposed as a kind of excitation scheme, involving periodic modulation of stiffness, which can effectively improve the quality factor and enhance the detection sensitivity and signal-to-noise ratio of gyroscope. Therefore, this dissertation takes the independently designed MEMS disk gyroscope as the object, and proposes and establishes the dual-modal parametric excitation dynamic equations of stiffness coupling and damping coupling. Based on the above analysis, a dual-modal parametric excitation control system for the MEMS disk resonator gyroscope is established, and the influence of parametric excitation on the drive signal and the sense mode is verified. Compared with the open-loop detection and control scheme without parametric excitation, the main performance of the gyroscope has been significantly improved, including a 6.4-fold increase in the quality factor amplification gain for the drive mode, a 4.9 -fold improvement in open-loop detection sensitivity, and a 2.5-fold enhancement of bias instability. The bias instability is increased from 20.18/h to 8.04/*** angle random walk is increased from 1.65/h to 0.59/h © 2024 IEEE.

关键词： Gyroscopes

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Aqueous-phase formation of N-containing secondary organic compounds affected by the ionic strength

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Journal of Environmental sciences 2024年第4期138卷 88-101页

作者： Yuqi Gan Xiaohui Lu Shaodong Chen Xinghua Jiang Shanye Yang Xiewen Ma Mei Li Fan Yang Yewen Shi Xiaofei Wang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Guangdong Provincial Observation and Research Station for Coastal Atmosphere and Climate of the Great Bay Area Southern University of Science and TechnologyShenzhen 518055China Institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air PollutionJinan UniversityGuangzhouChina Environmental Monitoring Station of Pudong New District Shanghai 201200China Shanghai Municipal Center for Disease Control&Prevention Shanghai 200336China

The reaction of carbonyl-to-imine/hemiaminal conversion in the atmospheric aqueous phase is a critical pathway to produce the light-absorbing N-containing secondary organic compounds(SOC).The formation mechanism of these compounds has been wildly investigated in bulk solutions with a low ionic ***,the ionic strength in the aqueous phase of the polluted atmosphere may be *** is still unclear whether and to what extent the inorganic ions can affect the SOC *** we prepared the bulk solution with certain ionic strength,in which glyoxal and ammonium were mixed to mimic the aqueous-phase *** characterization by High-resolution Mass Spectrometry was performed to identify the N-containing products,and the light absorption of the mixtures was measured by ultraviolet-visible ***-nine N-containing compounds were identified and divided into four categories(N-heterocyclic chromophores,high-molecular-weight compounds with N-heterocycle,aliphatic imines/hemiaminals,and the unclassified).It was observed that the longer reaction time and higher ionic strength led to the formation of more N-heterocyclic chromophores and the increasing of the lightabsorbance of the *** added inorganic ions were proposed to make the aqueous phase somewhat viscous so that the molecules were prone to undergo consecutive and intramolecular reactions to form the *** general,this study revealed that the enhanced ionic strength and prolonged reaction time had the promotion effect on the lightabsorbing SOC *** implies that the aldehyde-derived aqueous-phase SOC would contribute more light-absorbing particulate matter in the industrial or populated area where inorganic ions are abundant.

关键词： Ionic strength Carbonyl-to-imine/hemiaminal Heterocyclic Brown carbon Mass spectrometry Aqueous-phase reaction

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The influence of biochar from animal and plant on the transformation of phosphorus during paper mill sludge composting

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Environmental science and Pollution research 2024年 1-12页

作者： Zhong, Siming Yu, Zhen Liu, Xiaoming Zhao, Meihua Rong, Hongwei School of Civil Engineering Guangzhou University Guangzhou510006 China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management Institute of Eco-Environmental and Soil Sciences Guangdong Academy of Sciences Guangzhou510650 China

Biochar has effect on phosphorus adsorption, release, and transformation. This study compared the influence of biochar derived from animal (AB) and plant (PB) during paper mill sludge composting. Results indicated AB not only accelerated sludge decomposition but also had significantly higher levels of available phosphorus (AP) than PB and CK (no biochar), with AP contents in the order of AB > PB > CK. Compared to CK, AB was found to increase the relative abundance of thermophilic bacteria, and PB diversified the microbial community. Based on Pearson and RDA results, TOC/TN ratio (C/N) and organic matter (OM) explained above 50% of the variance in microbial community and phosphorus fractions. Thermophilic bacteria with high levels of OM and C/N promoted the conversion among labile and moderately labile organic phosphorus, moderately labile inorganic phosphorus, and AP. Biochar could enhance the AP conversion pathway, leading to increased levels of AP. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Animals

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research on Integrated Mission Planning and Design Method for China’s Manned Lunar Exploration

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Advances in Astronautics science and Technology 2024年第1期7卷 19-35页

作者： Zhou, Wanmeng Zhou, Wenyan Deng, Xinyu Li, Gefei China Astronauts Research and Training Center Beijing100094 China Beijing Institute of Spacecraft System Engineering Beijing100094 China Beijing Institute of Astronautical Systems Engineering Beijing100076 China Beijing Aerospace Control Center Beijing100094 China

Aiming at the requirements of top-level mission planning for manned lunar exploration, an integrated mission planning and design method is proposed for China’s manned lunar exploration. By decomposing the whole flight profile, an integrated method based on the circumlunar perturbation is proposed. Then, the three key constraints of sunlight condition, lunar orbit and return landing sites are identified and analyzed. According to the analysis results and the different time scale constraints, the mission monthly window, daily window and hourly window are gradually selected to meet the engineering requirements. In the end, the method has been verified by the co-simulation of manned lunar exploration on the integration platform. It has been proved that the proposed method can solve the comprehensive window design problem for standard and delayed mission, and also provides an effective pathway for rapid planning in a large time scale. This is an English translated version of "research on Integrated Mission Planning and Design Method for China’s Manned Lunar Exploration" originally published in Journal of Astronautics. © Chinese Society of Astronautics 2024. corrected publication 2024.

关键词： Lunar missions

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