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Ambient formaldehyde concentrations in summer in 30 Chinese cities and impacts on air cleaning of built environment

Energy and Built Environment 2024年第4期5卷 493-499页

作者： Shuolin Qiu Zirui He Guangdong Liu Zhen Ding Zhongming Bu Jianping Cao Wenjing Ji Wei Liu Chunxiao Su Xinke Wang Fan Liu Ting Li Hua Qian Cong Liu School of Energy and Environment Southeast UniversityNanjingJiangsu210096China China Green Development Investment Group Co.LTD Beijing100000China Department of Environmental Health Jiangsu Provincial Center for Disease Control and PreventionNanjingJiangsu210009China Department of Energy and Environmental System Engineering Zhejiang University of Science and TechnologyHangzhouZhejiang310023China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhouGuangdong510006China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing100083China Institute for Health and Environment Chongqing University of Science and TechnologyChongqing401331China School of Environment and Architecture University of Shanghai for Science and TechnologyShanghai200093China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an710049ShaanxiChina Tsinghua University Beijing100084China

Formaldehyde is an important carcinogen commonly found *** indoor sources have been intensively *** study on outdoor formaldehyde concentration,which is potentially an important source to indoors,remains *** study attempts to characterize temporal and spatial distribution of the atmospheric formalde-hyde concentration in Chinese *** variation of ambient formaldehyde was examined in 6 cities and peak hours were identified between 12:00 pm and 3:00 ***,outdoor formaldehyde concentrations were measured in the peak hours in 30 cities during the summer months of Jul.-Aug.,*** formaldehyde concentrations in the peak hours fell into a range of 0.005-0.087 mg/m^(3)(median value is 0.027 mg/m^(3)),87.7%of which have exceeded the chronic reference exposure criteria of 0.009 mg/m^(3) set by Office of Environmental Health Hazard *** risk analysis suggests that exposure to ambient formaldehyde could cause a median carcinogenic risk of 1.9×10^(−5)(3.17×10^(−6)-6.13×10^(−5)),higher than threshold limit of 10−*** correlation analysis of the 30 cities shows that ambient summertime atmospheric formaldehyde concentrations of the city are positively correlated with its Gross Domestic Product(r=0.48).We also found that the outdoor formaldehyde concentrations in urban areas(median:0.017 mg/m^(3))is slightly higher than those in suburban areas(median:0.013 mg/m^(3)).Results here prove that outdoor formaldehyde is ubiquitous in Chinese cities and reduces effectiveness of ventilation in dilution indoor *** it would underestimate air cleaner capacity needed by a factor of about *** should be accounted for in health analysis and air quality engineering control design of built environment in the future.

关键词： Atmospheric formaldehyde Temporal distribution Health risk Ventilation efficiency

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Design and Implementation of Security Protection for Service Call in New Generation Dispatching technology Support system

Design and Implementation of Security Protection for Service...

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Information Science, Parallel and Distributed systems (ISPDS), International Conference on

作者： Qiang Yi Shupeng Wan Ping Zhang Zhemin Wang Yuhao Tang Rui Tao NARI Group Corporation(State Grid Electric Power Research Institute) NARI Technology Co. Ltd Nanjing China NARI Control System Co. Ltd Nanjing China System R&D Center NARI Group Corporation(State Grid Electric Power Research Institute) NARI Technology Co. Ltd Nanjing China

To meet the needs of future power system development and safe, stable, and high-quality operation, it is proposed to build a new generation of dispatching technology support system. The new generation dispatching technology support system fully inherits the achievements of the smart grid dispatch control system, inherits the boundary security protection strategy of the original smart grid dispatch control system, and provides comprehensive security protection for all internal links of the system. This paper introduces the use of secure communication bus, security reinforcement based on authentication and encryption technology, and the use of signature verification, encryption and decryption, Anti-replay and other secure communication technologies for communication transmission between applications.

关键词：

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Analysis of multiple-faults of high-voltage circuit breakers based on non-negative matrix decomposition

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Global Energy Interconnection 2024年第2期7卷 179-189页

作者： Yongrong Zhou Zhaoxing Ma Hao Chen Ruihua Wang State Key Laboratory of Technology and Equipment for Defense against Power System Operational Risks Nanjing 211106P.R.China Nari Group Co. Ltd.Nanjing 211106P.R.China Qingdao University of Technology School of Information and Control EngineeringQingdao 266520P.R.China State Grid Nanjing Power Supply Company Nanjing 211000P.R.China

High-voltage circuit breakers are the core equipment in power networks,and to a certain extent,are related to the safe and reliable operation of power ***,their core components are prone to mechanical *** study proposes a component separation method to detect multiple mechanical faults in circuit breakers that can achieve online real-time ***,a model and strategy are presented for obtaining mechanical voiceprint signals from circuit ***,the component separation method was used to decompose the voiceprint signals of multiple faults into individual component *** on this,the recognition of the features of a single-fault voiceprint signal can be ***,multiple faults in high-voltage circuit breakers were identified through an experimental simulation and verification of the circuit breaker voiceprint signals collected from the substation *** research results indicate that the proposed method exhibits excellent performance for multiple mechanical faults,such as spring structures and loose internal components of circuit *** addition,it provides a reference method for the real-time online monitoring of high-voltage circuit breakers.

关键词： High voltage circuit breaker Signal separation Monitor Multiple faults Power system

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MARS: Multi-Agent Deep Reinforcement Learning for Real-Time Workflow Scheduling in Hybrid Clouds with Privacy Protection

MARS: Multi-Agent Deep Reinforcement Learning for Real-Time ...

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Long Cheng Haoyang He Yan Gu Qingzhi Liu Zhiming Zhao Fang Fang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing China Information Technology Group Wageningen University and Research Netherlands Research Group of Multi-Scale Networked Systems University of Amsterdam Netherlands

ISBN: (数字)9798331515966

ISBN: (纸本)9798331515973

Scheduling workflows in hybrid cloud environments presents significant challenges due to the inherent complexity of workflows and the dynamic nature of cloud resources. This complexity is further increased when attempting to balance workflow performance with privacy protection. Recent efforts have leveraged deep reinforcement learning (DRL) to address these challenges. However, most of these approaches rely on single-agent models, which can lead to security issues and scalability problems due to their centralized processing. Specifically, the properties of workflows are transferred to the single agent, which risks leaking privacy information. Our paper addresses these issues by introducing MARS, a real-time workflow scheduling method that prioritizes privacy protection in hybrid clouds. MARS leverages multi-agent deep reinforcement learning (MADRL) to optimize the workflow scheduling of cloud virtual machines (VMs). The benefit of our solution is that it relies on the collaborative learning of multi-agents on multiple VMs, which could assign user data to specific cloud servers for privacy protection while sharing training experiences between agents. In our implementation, MARS aims to reduce workflow completion time and operational costs while complying with strict privacy protection guidelines. The experimental results demonstrate that MARS can significantly surpass existing methods, reducing makespan by an average of $53.18 \%$ and costs by $61.98 \%$ compared to basic techniques, and achieving $20.26 \%$ and $25.71 \%$ improvements over the latest advanced methods, respectively.

关键词： Training Cloud computing Privacy Costs Scalability Deep reinforcement learning Dynamic scheduling Real-time systems Complexity theory Protection

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Research on a New Integrated Device for Remote control of Power Cable Testing and Cutting

Research on a New Integrated Device for Remote Control of Po...

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2024 Boao New Power system International Forum - Power system and New Energy technology Innovation Forum, NPSIF 2024

作者： Cao, Kangyangyong Xing, Hongquan Zhang, Yilin Xue, Chuan Li, Feiyi Gao, Ziyang State Grid Changchun Power Supply Company Changdian Group Cable Engineering Branch Jilin Changchun130000 China State Grid Changchun Power Supply Company Operation Maintenance Department Jilin Changchun130000 China Northeast Electric Power University Engineering Training and Teaching Center Jilin Jilin132011 China Jilin Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132011 China

ISBN: (纸本)9798331504557

With the continuous improvement and development of urban power grid structures, it is inevitable that cable lines will need to be renovated and replaced. In the process of cable construction, the traditional cable cutting process involves independent operations, requiring a large amount of equipment and occupying a large area. Workers need to wear protective clothing when cutting, which is inflexible and inefficient. This approach is no longer adequate for the diverse and complex construction sites of today. To this end, a new type of integrated power cable cutting device is specially designed and developed, which combines testing and cutting, reducing the use of cable cutting tools. The newly developed circuit cutter is designed with features such as compact size, high structural strength, good cutting effect, strong adaptability, and remote control function. It can significantly improve the safety and convenience of cable cutting operations, which is of positive significance for improving construction quality and efficiency and ensuring the personal safety of operators. © 2024 IEEE.

关键词： Remote control

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Event-triggered H∞ Consensus of Leader-follower Multi-agent systems

Event-triggered H∞ Consensus of Leader-follower Multi-agent...

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第43届中国控制会议

作者： Cheng Gong Chenguang Ai Xuemin Zuo Zhuang Ma W.Dai Key Lab of Intelligent Data Information Processing and Control of Hebei Province Key Lab of Intelligent Motion Control System of Tangshan City Intelligence and Information Engineering College Tangshan University Hebei Jianzhi Casting Group Ltd. College of Electrical Engineering North China University of Science and Technology

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

This paper discusses the H consensus problem of leader-follower multi-agent systems. The controller for each agent is crafted to utilize comprehensive information from all connected agents, while an innovative event-triggered strategy is incorporated to minimize communication costs. Based on the Lyapunov function theory, an H controller is proposed that can ensure both system stability and a prescribed disturbance attenuation level γ. Finally, a numerical example validated the effectiveness of the proposed method.

关键词： Leader-follower Multi-agent systems Event-triggered H_∞ consensus

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Optimal Sensor Placement for Health Monitoring of Large Space Structures in Harsh Environment: A GA-EfI Approach 1

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8th Asia International Symposium on Mechatronics, AISM 2021

作者： Xu, Pengying Wang, Yan Xu, Xiaoxian Teng, Yucheng Ge, Dongming Leng, Guojun Wu, Yang Wang, Xuezi Hu, Xinlan Wang, Congsi Key Laboratory of Electronic Equipment Structure Design Ministry of Education Xidian University Xi’an710071 China School of Information and Control Engineering Xi’an University of Architecture and Technology Xi’an710055 China Beijing Institute of Spacecraft System Engineering Beijing100094 China The 29th Research Institute of China Electronics Technology Group Corporation Chengdu610036 China The 54th Research Institute of China Electronics Technology Group Corporation Shijiazhuang050081 China

ISBN: (数字)9789811913099

ISBN: (纸本)9789811913082

Considering the problems of information redundancy, incomplete information perception and space structure limitation in the sensor layout of large and complex structures, a sensor layout algorithm for structural health monitoring based on electromechanical coupling idea, a GA-EfI, is proposed. The proposed method overcomes the limitations of a single method, combines the powerful parallel search ability of genetic algorithm and the characteristics of effective independent method to eliminate redundant information, so as to ensure a very comprehensive perception of structural information with the least number of sensors. Finally, taking a vehicle-borne active phased array antenna as an example, the advantages of the proposed algorithm in antenna array reconstruction accuracy and calculation efficiency are verified by comparing with the other four algorithms which have been widely used. The method proposed in this paper can provide a new idea to solve the problem for the optimal layout of sensors in the fields of aerospace and large-scale structural monitoring. © 2022, Science Press.

关键词： Genetic algorithms

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Fault-Tolerant control of Hybrid UAV Using Weighted control Allocation Scheme

Fault-Tolerant Control of Hybrid UAV Using Weighted Control ...

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American control Conference (ACC)

作者： Salman Ijaz Umair Javaid Ahmed Nasr Donglei Sun Members of Control System Laboratory and Key Laboratory of More-Electric Aircraft Zhejiang Province and University of Nottingham Ningbo China School of Robotics Ningbo University of Technology Zhejiang China Advanced Intelligent Manufacturing Research Group University of Nottingham Ningbo China

ISBN: (数字)9798350382655

ISBN: (纸本)9798350382662

This study presents a methodology to enhance the operating safety of hybrid unmanned aerial vehicles by employing an active fault-tolerant control technique. The idea is to incorporate the weighted control allocation scheme with integral-sliding mode control law to attain accurate tracking performance while accounting for the impact of actuator faults and failures. One notable benefit of this methodology lies in its ability to attain tracking accuracy in all operational modes of hybrid UAVs through the careful creation of a suitable weighting matrix. The efficiency of the suggested system is demonstrated by numerical simulations conducted on a longitudinal model of an octoplane aircraft. The proposed controller demonstrates satisfactory performance both in nom-inal conditions and under faults occurring in the elevator and rotors 1, 2, 7, and 8 at 20s and 40s.

关键词： Smart agriculture Actuators Fault tolerance Accuracy Fault tolerant systems Spraying Autonomous aerial vehicles

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High-Precision Admittance control of Mechanical Arm Based on Force Sensor Compensation

High-Precision Admittance Control of Mechanical Arm Based on...

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第34届中国控制与决策会议

作者： Yaohui Wu Jiangbo Zhao Junzheng Wang Xin Zhang Key Laboratory of Complex System Intelligent Control and Decision School of AutomationBeijing Institute of Technology Key Laboratory of Servo Motion System Drive and Control Ministry of Industry and Information TechnologySchool of AutomationBeijing Institute of Technology Technical center Xinxing Cathay International Group Co.Ltd.

Admittance control is one of the important methods of compliance *** is performed by inputting force signals and outputting position *** control can achieve high accuracy,but the force signals have large errors,which is an important factor affecting its *** the force sensor collects force data,there are non-negligible initial deviations due to gravity,installation,and other factors,resulting in poor admittance control *** order to solve this problem,this paper takes the six-degree-of-freedom manipulator admittance control as the research *** to the mapping relationship between the end attitude and the sensor errors,we propose a method of obtaining the initial offset value of the sensor through data *** method traverses the initial values of the sensor in each working posture when the sensor has no external force input,and then performs secondary interpolation to obtain the offset values of the sensor in any posture,corrects the output values of the force/torque sensor,and then improve the accuracy of admittance *** experimental results show that this method can quickly and effectively improve the calculation accuracy of the sensor's initial deviation values and the admittance control accuracy.

关键词： Admittance control Force/torque sensor Quadratic interpolation Precision optimization

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Orthogonal On-Rotor Sensing Vibrations for Condition Monitoring of Rotating Machines

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Journal of Dynamics, Monitoring and Diagnostics 2022年第1期1卷 29-36页

作者： Yuandong Xu Xiaoli Tang Guojin Feng Dong Wang Craig Ashworth Fengshou Gu Andrew D.Ball Dynamics Group Department of Mechanical EngineeringImperial College LondonLondonUK School of Engineering and Technology Aston UniversityBirminghamUK School of Mechanical Engineering Hebei University of TechnologyTianjinChina State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityChina Control System Integration Ltd LittleboroughUK Centre for Efficiency and Performance Engineering University of HuddersfieldHuddersfieldUK

Thanks to the fast development of micro-electro-mechanical systems(MEMS)technologies,MEMS accelerometers show great potentialities for machine condition *** overcome the problems of a poor signal to noise ratio(SNR),complicated modulation,and high costs of vibration measurement and computation using conventional integrated electronics piezoelectric accelerometers,a triaxialMEMS accelerometer-based on-rotor sensing(ORS)technology was developed in this *** wireless data transmission capability,the ORS unit can be mounted on a rotating rotor to obtain both rotational and transverse dynamics of the rotor with a high *** orthogonal outputs lead to a construction method of analytic signals in the time domain,which is versatile in fault detection and diagnosis of rotating *** case studies based on an induction motor were carried out,which demonstrated that incipient bearing defect and half-broken rotor bar can be effectively diagnosed by the proposed measurement and analysis ***,vibration signals from translational on-casing accelerometers are less capable of detecting such *** demonstrates the superiority of the ORS vibrations in fault detection of rotating machines.

关键词： On-rotor sensing vibration condition monitoring rotating machines

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