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A critical review on lead migration, transformation and emission control in Chinese coal-fired power plants

Journal of Environmental Sciences 2023年第2期124卷 397-413页

作者： Yicheng Wang Hongyun Hu Xinye Wang Huimin Liu Lu Dong Guangqian Luo Yongchun Zhao Hong Yao State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210023China

Coal is widely utilized as an important energy source,but coal-fired power plant was considered to be an important anthropogenic lead emission *** the present study,the distribution characteristics of lead in coal and combustion by-products are ***,lead is mainly transferred to ash particles and the formation and migration mechanisms of particulate lead are ***,targeted measures are proposed to control the formation of fine particulate lead as well as to increase the removal efficiency during the low-temperature flue gas clean *** detail,interactions between gaseous lead and some coal-bearing minerals or added adsorbents could obviously suppress the formation of fine particulate *** the other hand,some efforts(including promoting capture of fine particles,reducing resistivity of particles and strengthening the gas-liquid contact)could be made to improve the fine particulate lead removal ***,the formation mechanism of fine particulate lead is still unclear due to the limitations of research *** differences in the removal principles of fine particles and particulate lead make the lead emission precisely control a great ***,the environmental potential risk of lead emission from flue gas and ash residues is addressed and further discussed.

关键词： Coal combustion Particulate lead Formation and migration Removal strengthen Environmental risk

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A novel permeability calculation model to simultaneously quantify the impacts of pore and fracture with full feature size

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International Journal of Mining Science and Technology 2025年第4期35卷 609-618页

作者： Minghui Li Banghong Zhang Zhouqian Wu Shaochen Luo Jun Lu Dongming Zhang Heping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

The permeability of rocks is of utmost importance in the exploitation of deep geological *** characterizations of rock permeability typically consider the influence of either pores or fractures ***,deep reservoir rock formations are subjected to complex environments with coupling of high temperature and *** a result,deep reservoir rocks possess a complex structure comprising of pores and fractures,making it challenging to understand their impact on *** this relationship is vital for the secure and efficient exploitation of deep geological *** study presents a permeability calculation model that enables simultaneously quantify the impacts of pore and fracture with full feature *** model independently considers large-scale fractures’fractal properties and tortuosity while also addressing the distribution and size of small-scale pores.A tortuosity expression that incorporates the effects of thermal damage has been developed using the pore geometric elasticity *** the distinct contributions of pores and fractures to rock permeability,a comprehensive rock permeability calculation model is *** model has two main strengths:it thoroughly characterizes the influence of pore structures on permeability at multiple scales and precisely details how fractal attributes of fractures affect *** validate the applicability of the model,this study conducted seepage experiments and microscopic observations,capturing the variations in permeability under thermo-mechanical coupling,while quantifying the geometric characteristics and spatial distribution of pores and fractures within the *** comparing the measured permeability results,the theoretical values demonstrated a commendable *** comparison to previous models,this innovative approach more accurately captures various flow characteristics of the rock under the influence of thermo-mechanical coupling.

关键词： Hot dry rock Geothermal exploitation Permeability Fracture-pore microstructure

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Path Planning Algorithm for Manipulator Based on Manipulability-Maximizing 13

Path Planning Algorithm for Manipulator Based on Manipulabil...

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13th IEEE Data Driven control and Learning Systems Conference, DDCLS 2024

作者： Zhang, Rui Liu, Shan College of Control Science and Engineering Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou310027 China

ISBN: (纸本)9798350361674

An improved path planning algorithm based on RRT∗ is proposed for the manipulator to generate a collision-free path for end-effector in this paper, which maximizes the manipulator's manipulability throughout the entire path. The algorithm introduces manipulability information as prior information to guide the RRT node toward desired regions. By introducing hybrid cost into improved RRT* algorithm, the path length is minimized while the expected manipulability is maximized. Finally, the end-effector path is transformed into a configuration trajectory by solving a multi-objective optimization problem. The simulation results compared with RRT* demonstrates the effectiveness of the proposed algorithm. © 2024 IEEE.

关键词： End effectors

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Impacts of o-cresol spill on composition and function of river sediment and soil microbial communities

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Environmental Science and Pollution Research 2024年第22期31卷 31978-31988页

作者： Chen, Xiuli Yang, Yuyin Wang, Ji Pan, Chaoyi Zhang, Zhengke Chen, Sili Xie, Shuguang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China Guangzhou510655 China

o-Cresol is a toxic substance with strong irritating and corrosive effects on skin and mucous membranes. To date, information on the effects of o-cresol on microbial communities in the natural environment is very limited. In the present study, 16S rRNA sequencing and metagenomic technique were carried out to elucidate the effects of the o-cresol spill on microbial communities in river sediments and nearby soils. o-Cresol spill induced the increase in the relative abundance of phyla Planctomycetes and Gemmatimonadetes, suggesting their resilience to o-cresol-induced stress. Uncultured Gemmatimonadetes genera and the MND1 genus exhibited enrichment, while the Pseudomonas genus dominated across all samples, indicating their potential pivotal roles in adapting to the o-cresol spill. Moreover, o-cresol spill impaired the metabolic functions of microbes but triggered their defense mechanisms. Under o-cresol pressure, microbial functions related to carbon fixation were upregulated and functions associated with sulfur metabolism were downregulated. In addition, the o-cresol spill led to an increase in functional genes related to the conversion of o-cresol to 3-methylcatechol. Several genes involved in the degradation of aromatic compounds were also identified, potentially contributing to the biodegradation of o-cresol. This study provides fresh insights into the repercussions of an abrupt o-cresol spill on microbial communities in natural environments, shedding light on their adaptability, defense mechanisms, and biodegradation potential. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Sediments

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Effects of acid deposition control in China:a review based on responses of subtropical forests

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Frontiers of Environmental Science & engineering 2024年第6期18卷 115-126页

作者： Danni Xie Xiaodong Ge Lei Duan Jan Mulder School of Land Engineering Chang’an UniversityXi’an 710064China State Key Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life SciencesBox 5003NO-1432ÅsNorway

For many decades,acid deposition used to pose a significant regional air pollution challenge in *** substantial emission control of anthropogenically derived sulfur and nitrogen containing gasses,both sulfur and nitrogen deposition,as well as the acid rain-affected area,have significantly decreased compared to their peak ***,particularly in the humid subtropics,are sensitive to acid deposition,as evidenced by soil acidification,sulfate and nitrate leaching in stream water,and elevated soil nitrous oxide *** in the total deposition of sulfur and nitrogen,caused a significant decline in sulfate and nitrate leaching from subtropical forest and subsequently in sulfate and nitrate concentrations in stream water,although there was about a 5-year *** delay may be attributed to the desorption of accumulated sulfate and continued elevated mineralization of accumulated nitrogen *** of nitrous oxide,a potent greenhouse gas,also declined in nitrogen-saturated subtropical forest soils,as soil water nitrate concentration ***,subtropical forests in China suffering from elevated acid deposition have begun to ***,the current levels of sulfur and nitrogen deposition continue to exceed the critical loads,i.e.,the assigned threshold levels in accordance with emission control policies,in more than 10%of the country’s land area,respectively,indicating remaining risks of acidification and ***,further emission reductions are urgently needed,also because they will help achieving goals related to air quality and nitrous oxide emissions.

关键词： Acidification Critical load Nitrous oxide Surface water chemistry Recovery

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A comprehensive review of electro-tribological behavior in conductive lubricants

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Friction 2025年第4期13卷 17-45页

作者： Xiang Xi Zijie Zhao Hailong Li Wei Gu Wen Xie Wenyi Zhang Chih-An Lo Lin Xue Hongqiang Chu Linhua Jiang College of Civil and Transportation Engineering Hohai UniversityNanjing 210098 State Key Laboratory of High Performance Civil Engineering Materials Jiangsu Research Institute of Building Science Co.Ltd.Nanjing 210008China School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Industrial and Systems Engineering University at BuffaloBuffaloNY 14260USA College of Materials Science and Engineering Hohai UniversityChangzhou 213000China

The electric machinery industry is currently facing a significant challenge in the application of electrical contact materials with appropriate electrical and tribological *** use of conductive lubricants,including liquid,solid,and semi-solid varieties,represents a key approach to meeting technical and sustainable *** strategy is closely linked to the development of multifunctional additives with excellent conduction properties in response to the growing concerns regarding the increased durability of electrical *** paper provides a comprehensive review of prior research in this area,specifically studies investigating conductive lubricants incorporating conductive additives and demonstrating exceptional electro-tribological *** conductive additives have been incorporated into these lubricants,each providing unique advantages,such as enhancing conductive connectivity,reducing friction and wear,and improving the dispersion of other functional *** review covers a range of conductive materials,including carbon-based materials(carbon nanotubes,graphene nanosheets,carbon black,etc.),ionic liquids(ILs),metals(soft metal-based composites,gallium-based liquid metals),MAX phases,semiconductors,and conductive polymers,and discusses their impact on the electrical conductivity and electro-tribological properties of conductive ***,the electro-tribological properties of insulating lubricants are *** conductive lubricants are identified based on comparisons of their electrical conductivity,coefficient of friction(COF),wear rate,and electrical contact resistance(ECR)under various current-carrying friction(CCF)*** conclusion,it is found that conductive lubricants effectively reduce friction and wear under current-carrying conditions,thus contributing to the advancement of the electrical machinery *** paper also outlines potential research directions in this field,pointin

关键词： conductive lubricants electro-tribological properties electric contact friction and wear conductivity

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Obstacle detection and autonomous stair climbing of a miniature jumping robot

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Biomimetic Intelligence & Robotics 2023年第1期3卷 11-21页

作者： Yaning Zhang Jun Zhang Bohuai Chen Haoyun Chen Aiguo Song The State Key Laboratory of Bioelectronics Jiangsu Key Lab of Remote Measurement and ControlSchool of Instrument Science and EngineeringSoutheast UniversityNanjing 210096China

Miniature jumping robots(MJRs)have difficulty executing autonomous movements in unstructured environments with obstacles because of their limited perception and computing *** study investigates the obstacle detection and autonomous stair climbing methods for *** propose an obstacle detection method based on a combination of attitude and distance detections,as well as MJRs’motion.A MEMS inertial sensor collects the yaw angle of the robot,and a ranging sensor senses the distance between the robot and the obstacle to estimate the size of the *** also propose an autonomous stair climbing algorithm based on the obstacle detection *** robot can detect the height and width of stairs and its position relative to the stairs and then repeatedly jump to climb them step by ***,the height,width,and position are sent to a control terminal through a wireless sensor network to update the information regarding the MJR and stairs in a control ***,we conduct stair detection,modeling,and stair climbing experiments on the MJR and obtain acceptable precisions for autonomous obstacle ***,the proposed obstacle detection and stair climbing methods can enhance the locomotion capability of the MJR in environmental monitoring,search and rescue,etc.

关键词： Jumping robot Obstacle detection Obstacle modeling Active perception Autonomous stair climbing

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Resilience-oriented Hardening and Expansion Planning of Transmission System Under Hurricane Impact

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1746-1760页

作者： Jing Zhou Heng Zhang Haozhong Cheng Shenxi Zhang Lu Liu Zheng Wang Xiaohu Zhang Key Laboratory of Control of Power Transmission and Conversion Ministry of EducationElectrical Engineering DepartmentShanghai Jiao Tong UniversityShanghai 200240China State Grid East China Branch Shanghai 200120China

In this paper,we propose a two-stage transmission hardening and planning(TH&P)model that can meet the load growth demand of normal scenarios and the resilience requirements of hurricane-induced damage *** better measure the resilience requirements,the proposed TH&P model includes two resilience assessment indexes,namely,the load shedding(LS)under the damage scenario and the average connectivity degree(ACD)at different *** first-stage model,which aims to meet the load growth demand while minimizing the LS,is formulated as a mixed-integer linear program(MILP)to minimize the total planning and hardening cost of transmission lines,the operating cost of generators,and the penalty cost of wind power and load shedding in both normal and damage *** second-stage model aims to further improve the ACD when the ACD of the scheme obtained from the first-stage model cannot reach the ***,the contribution of each transmission line to the ACD is calculated,and the next hardened line is determined to increase the *** process is repeated until the ACD meets the *** studies of the modified IEEE RTS-24 and two-area IEEE reliability test system-1996 indicate the proposed TH&P model can meet the requirements for both normal and damage scenarios.

关键词： Hardening hurricane disaster resilience transmission expansion planning

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Molecular transformation of dissolved organic matter in refinery wastewaters: Characterized by FT-ICR MS coupled with electrospray ionization and atmospheric pressure photoionization

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Petroleum Science 2023年第1期20卷 590-599页

作者： Chen He Wei-Ming Chen Chun-Mao Chen Quan Shi State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Oil and Gas Pollution ControlChina University of PetroleumBeijing 102249China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengduSichuan 611756China

Dissolved organic matter(DOM)in refinery wastewater is an extremely complex mixture of various organic *** mass spectrometry,it is impossible to characterize all of the DOM molecules with only one ionization *** this study,negative-ion,electrospray ionization(ESI),positive-ion ESI,and positive-ion atmospheric pressure photoionization(APPI)were coupled with Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)to analyze the molecular composition of DOM in a refinery wastewater stream during the treatment *** were obvious differences in the heteroatom composition,number of DOM constituents,and chemical properties in refinery wastewater under the three ionization *** CHO and CHOS compounds detected by(+)ESI,basic CHN and CHON compounds detected by(þ)ESI,and hydrocarbons detected by(+)APPI were analyzed to determine the molecular transformations that occurred during *** an anaerobic biological treatment process,acidic CHO and CHOS compounds with a high oxygen content were preferentially removed,and acidic CHO and CHOS compounds with a low oxygen content were *** an aerobic biological process,acidic CHO and CHOS compounds with a low oxygen content were preferentially removed,and acidic CHO and CHOS compounds with a high oxygen content were *** whole biological treatment process has a poor removal efficiency for CHN and CHON compounds,and *** activated carbon(AC)adsorption process removed different heteroatom compounds mainly with a low oxygen content for acidic and basic *** transformation mechanism of CHO and CHOS compounds in the biological treatment process was analyzed by the Kendrick mass defect(KMD)theory and a mass difference network *** the anaerobic process,large amounts of oxygenated CHO and CHOS compounds were degraded by decarboxylation,deoxydation,demethoxylation,and dehydration reactions,and converted to lower oxygen content *** the aerobic

关键词： Refinery wastewater DOM Molecular transformation ESI APPI FT-ICR MS

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In-situ forming ultra-mechanically sensitive materials for high-sensitivity stretchable fiber strain sensors

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National Science Review 2024年第6期11卷 254-263页

作者： Rouhui Yu Changxian Wang Xiangheng Du Xiaowen Bai Yongzhong Tong Huifang Chen Xuemei Sun Jing Yang Naoji Matsuhisa Huisheng Peng Meifang Zhu Shaowu Pan State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University MOE Key Lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Institute of Fiber Materials and Devices Fudan University Department of Cardiology Shanghai Xuhui Central HospitalZhongshan-Xuhui Hospital Fudan University Research Center for Advanced Science and Technology and Institute of Industrial Science The University of Tokyo

Fiber electronics with flexible and weavable features can be easily integrated into textiles for wearable applications. However, due to small sizes and curved surfaces of fiber materials, it remains challenging to load robust active layers, thus hindering production of high-sensitivity fiber strain sensors. Herein, functional sensing materials are firmly anchored on the fiber surface in-situ through a hydrolytic condensation *** anchoring sensing layer with robust interfacial adhesion is ultra-mechanically sensitive, which significantly improves the sensitivity of strain sensors due to the easy generation of microcracks during stretching. The resulting stretchable fiber sensors simultaneously possess an ultra-low strain detection limit of 0.05%, a high stretchability of 100%, and a high gauge factor of 433.6, giving 254-folds enhancement in sensitivity. Additionally, these fiber sensors are soft and lightweight, enabling them to be attached onto skin or woven into clothes for recording physiological signals, e.g. pulse wave velocity has been effectively obtained by them. As a demonstration, a fiber sensor-based wearable smart healthcare system is designed to monitor and transmit health status for timely intervention. This work presents an effective strategy for developing high-performance fiber strain sensors as well as other stretchable electronic devices.

关键词： fiber strain sensor stretchable wearable healthcare

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