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Mapping and measuring urban-rural inequalities in accessibility to social infrastructures

Geography and Sustainability 2024年第1期5卷 41-51页

作者： Chenmeng Guo weiqi zhou Chuanbao Jing Dawa Zhaxi State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Beijing Urban Ecosystem Research Station Research Center for Eco-environmental SciencesChinese Academy of SciencesBeijing 100085China School of Ecology and Environmental Science Yunnan UniversityKunming 650500China

Equal access to social infrastructures is a fundamental prerequisite for sustainable development,but has long been a great challenge *** studies have primarily focused on the accessibility to social infras-tructures in urban areas across various scales,with less attention to rural areas,where inequality can be more ***,few have investigated the disparities of accessibility to social infrastructures between urban and rural ***,using the Changsha-Zhuzhou-Xiangtan urban agglomeration,China,as an example,we investigated the inequality of accessibility in both urban and rural areas,and further compared the urban-rural *** was measured by travel time of residents to *** selected four types of social infrastructures including supermarkets,bus stops,primary schools,and health care,which were funda-mentally important to both urban and rural *** found large disparities in accessibility between urban and rural areas,ranging from 20 min to 2 *** residents had to spend one to two more hours to bus stops than urban residents,and 20 min more to the other three types of ***,accessibility to multiple infrastructures showed greater urban-rural *** residents in more than half of the towns had no access to any infrastructure within 15 min,while more than 60%of the urban residents could access to all infrastructures within 15 *** results revealed quantitative accessibility gap between urban and rural areas and underscored the necessity of social infrastructures planning to address such disparities.

关键词： Accessibility Social infrastructures Urban-rural difference Inequality Regional sustainability

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Urbanity mapping reveals the complexity,diffuseness,diversity,and connectivity of urbanized areas

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Geography and Sustainability 2024年第3期5卷 357-369页

作者： Dawa Zhaxi weiqi zhou Steward T.A.Pickett Chengmeng Guo Yang Yao State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Beijing Urban Ecosystem Research Station Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Beijing-Tianjin-Hebei Urban Megaregion National Observation and Research Station for Eco-Environmental Change Chinese Academy of SciencesBeijing 100085China Cary Institute of Ecosystem Studies MillbrookNY 12545USA

There are urgent calls for new approaches to map the global urban conditions of complexity,diffuseness,diversity,and ***,existing methods mostly focus on mapping urbanized areas as bio physical ***,based on the continuum of urbanity framework,we developed an approach for cross-scale urbanity map-ping from town to city and urban megaregion with different spatial resolutions using the Google Earth *** approach was developed based on multi-source remote sensing data,Points of Interest-Open Street Map(POIs-OSM)big data,and the random forest regression *** approach is scale-independent and revealed significant spatial variations in urbanity,underscoring differences in urbanization patterns across megaregions and between urban and rural *** was observed transcending traditional urban boundaries,diffusing into rural settlements within non-urban *** finding of urbanity in rural communities far from urban areas challenges the gradient theory of urban-rural development and *** mapping livelihoods,lifestyles,and connectivity simultaneously,urbanity maps present a more comprehensive characterization of the complex-ity,diffuseness,diversity,and connectivity of urbanized areas than that by land cover or population density *** helps enhance the understanding of urbanization beyond biophysical *** approach can provide a multifaceted understanding of urbanization,and thereby insights on urban and regional sustainability.

关键词： Continuum of Urbanity Big data Mapping Spatial regression Multiscale

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基于改进LQR的车辆路径跟踪横向控制策略

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华中科技大学学报（自然科学版） 2024年第3期52卷 135-141页

作者：周卫琪赵羿寒刘擎超陈龙江苏大学汽车工程研究院江苏镇江212013 镇江市江苏大学工程技术研究院江苏镇江212013

针对智能车辆通过弯道或狭窄区域过程中难以兼顾控制精度和通过安全裕度的问题,提出一种改进线性二次型调节器(LQR)的路径跟踪横向控制策略.首先,建立车辆系统动力学模型;其次,在横向控制方面设计了基于线性二次型调节器理论的控制器,... 详细信息

针对智能车辆通过弯道或狭窄区域过程中难以兼顾控制精度和通过安全裕度的问题,提出一种改进线性二次型调节器(LQR)的路径跟踪横向控制策略.首先,建立车辆系统动力学模型;其次,在横向控制方面设计了基于线性二次型调节器理论的控制器,添加前馈控制,提高了路径跟踪过程中的横向控制精度;提出车体偏差概念,在控制策略中加入车体尺寸约束,提高了车辆的通过性,使得控制输入得以保证控制精度和通过安全裕度;最后,联合PreScan和Matlab/Simulink软件对车库场景和连续变曲率狭窄弯道场景进行对比仿真试验验证.试验结果表明:本控制策略在上述场景中有着良好的跟踪效果,可以显著提高车辆在路径跟踪过程中的控制精度和通过安全裕度.

关键词：路径跟踪横向控制线性二次型调节器(LQR) 弯道区域安全裕度控制精度

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考虑驾驶风格的混合动力汽车强化学习能量管理策略

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西安交通大学学报 2024年第10期58卷 51-62页

作者：施德华袁超汪少华周卫琪陈龙江苏大学汽车工程研究院江苏镇江212013 江苏省新能源汽车电驱动系统与智能控制工程研究中心江苏镇江212013

为了提升混合动力汽车能量管理策略对不同风格驾驶员的适应性,基于深度强化学习和等效燃油消耗最小策略(equivalent consumption minimization strategy,ECMS),提出一种考虑驾驶风格的混合动力汽车能量管理策略。通过实车试验采集驾驶... 详细信息

为了提升混合动力汽车能量管理策略对不同风格驾驶员的适应性,基于深度强化学习和等效燃油消耗最小策略(equivalent consumption minimization strategy,ECMS),提出一种考虑驾驶风格的混合动力汽车能量管理策略。通过实车试验采集驾驶员行驶数据,基于采集数据进行驾驶员驾驶风格的聚类分析,建立驾驶风格识别模型;构建基于强化学习和ECMS的能量管理策略,将驾驶风格系数作为强化学习状态变量,利用多种驾驶风格的组合工况训练深度确定性策略梯度智能体,获取不同工况和驾驶风格下ECMS等效因子,采用ECMS求解最优发动机、电机转矩分配以及变速箱挡位;搭建硬件在环测试平台,并基于实际采集的不同驾驶员驾驶数据构建测试工况,验证所提出控制策略的有效性。研究结果表明,相较于基于规则策略、基于等效因子比例修正的自适应ECMS以及DRL-SAC策略,提出的考虑驾驶风格的强化学习能量管理策略使整车能量消耗分别降低16.35%、11.11%和7.56%,所提控制策略的有效性得到了验证。

关键词：混合动力汽车能量管理策略驾驶风格强化学习等效燃油消耗最小策略

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Effects of spatial resolution of remotely sensed data on estimating urban impervious surfaces

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Journal of Environmental Sciences 2011年第8期23卷 1375-1383页

作者： Weifeng Li Zhiyun Ouyang weiqi zhou Qiuwen Chen State Key laboratory of Urban and Region Ecology Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing1000~85 China. Department of Plant Sciences University of California Davis Mail Stop 1 1210 PES One Shields Ave. Davis CA 95616 USA

Impervious surfaces are the result of urbanization that can be explicitly quantified, managed and controlled at each stage of land development. It is a very useful environmental indicator that can be used to measure the impacts of urbanization on surface runoff, water quality, air quality, biodiversity and rnicroclimate. Therefore, accurate estimation of impervious surfaces is critical for urban environmental monitoring, land management, decision-making and urban planning. Many approaches have been developed to estimate surface imperviousness, using remotely sensed data with various spatial resolutions. However, few studies, have investigated the effects of spatial resolution on estimating surface imperviousness. We compare medium-resolution Landsat data with high-resolution SPOT images to quantify the imperviousness in Beijing, China. The results indicated that the overall 91% accuracy of estimates of imperviousness based on TM data was considerably higher than the 81% accuracy of the SPOT data. The higher resolution SPOT data did not always predict the imperviousness of the land better than the TM data. At the whole city level, the TM data better predicts the percentage cover of impervious surfaces. At the sub-city level, however, the ring belts from the central core to the urban-rural peripheral, the SPOT data may better predict the imperviousness. These results highlighted the need to combine multiple resolution data to quantify the percentage of imperviousness, as higher resolution data do not necessarily lead to more accurate estimates. The methodology and results in this study can be utilized to identify the most suitable remote sensing data to quickly and efficiently extract the pattern of the impervious land, which could provide the base for further study on many related urban environmental problems.

关键词： remote sensing impervious surface landscape pattern spatial resolution object-based image analysis urban landscape

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Sustainable urban systems:from landscape to ecological processes

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Ecological Processes 2022年第1期11卷 360-362页

作者： Yuyu zhou Gang Chen weiqi zhou Department of Geological and Atmospheric Sciences Iowa State UniversityAmesIA 50011USA Laboratory for Remote Sensing and Environmental Change(LRSEC) Department of Geography and Earth SciencesUniversity of North Carolina at CharlotteCharlotteNC 28223USA State Key Laboratory of Urban and Regional Ecology Research Center for Eco‑Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Our world is experiencing unprecedented land cover and land use changes(LCLUC)due to population growth,economic development,and global climate ***,one major form of LCLUC,has received growing attention for its significant role in changing ecological processes and functions of urban *** is a growing need,from both the academic and the policy-making communities,for science-based information and evidence to enhance our understanding of the urban ecological processes and societal needs because of the rapid urbanization over the past few decades across the *** information is key to informing the development of best practices for improved landscape and urban planning.

关键词： landscape Sustainable urban

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Quantifying the characteristics of particulate matters captured by urban plants using an automatic approach

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Journal of Environmental Sciences 2016年第1期28卷 259-267页

作者： Jingli Yan Lin Lin weiqi zhou Lijian Han Keming Ma State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China

It is widely accepted that urban plant leaves can capture airborne particles. Previous studies on the particle capture capacity of plant leaves have mostly focused on particle mass and/or size distribution. Fewer studies, however, have examined the particle density, and the size and shape characteristics of particles, which may have important implications for evaluating the particle capture efficiency of plants, and identifying the particle sources. In addition, the role of different vegetation types is as yet unclear. Here, we chose three species of different vegetation types, and firstly applied an object-based classification approach to automatically identify the particles from scanning electron microscope（SEM）micrographs. We then quantified the particle capture efficiency, and the major sources of particles were identified. We found（1） Rosa xanthina Lindl（shrub species） had greater retention efficiency than Broussonetia papyrifera（broadleaf species） and Pinus bungeana Zucc.（coniferous species）, in terms of particle number and particle area cover.（2） 97.9% of the identified particles had diameter ≤10 μm, and 67.1% of them had diameter ≤2.5 μm. 89.8% of the particles had smooth boundaries, with 23.4% of them being nearly spherical.（3） 32.4%–74.1% of the particles were generated from bare soil and construction activities, and 15.5%–23.0% were mainly from vehicle exhaust and cooking fumes.

关键词： Particulate matter retention Urban vegetation Object-based classification Size and shape characteristics Source identification

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Influence of methanol additive on bio-oil stability

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International Journal of Agricultural and Biological Engineering 2014年第3期7卷 83-92页

作者： Fei Wenting Liu Ronghou zhou weiqi Mei Yuanfei Yin Renzhan Biomass Energy Engineering Research Centre School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China

Methanol at different mass concentrations(1,6,11,16,21 wt%)was added into crude bio-oil to upgrade oil *** including pH value,water content and viscosity were measured regularly during a storage period of 91 ***-MS analysis was conducted before and after *** addition of 21 wt%methanol was found to improve the pH value from 2.97 to 3.88,and decrease the water content and viscosity after storage by 35.02%and 81.35%,*** GC-MS analysis result convincingly showed that methanol could inhibit aging reactions such as polymerization and esterification which created new compounds in the *** FTIR and NMR analysis showed that methanol caused some structural changes in bio-oil.

关键词： bio-oil pyrolysis stability methanol

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Global urbanization as a shifting context for applying ecological science toward the sustainable city

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Ecosystem Health and Sustainability 2015年第1期1卷 44-59页

作者： Steward T.A.Pickett weiqi zhou Cary Institute of Ecosystem Studies Box ABMillbrookNew York 12545 USA State Key Laboratory for Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085 China

There is an abundance of conceptual frameworks relevant to sustainability in urban ***,to advance urban ecological science and its application to sustainable urban transformations,key existing frameworks must be *** paper is a conceptual synthesis cast in essay form in order to encompass a broad range of relevant *** starts from the premise that the familiar models of metropolitan and megalopolitan urban structure,of industrially driven urban development,and of the contrasts between urban and non-urban lands are manifestly inadequate representations of evolving global *** inadequacy is illustrated with examples from the United States and from *** the form and the interactions involved in contemporary urbanization and urban change suggest the need for a new integrated framework synthesizing two existing yet still evolving concepts:(1)The urban megaregion framework accommodates the spatial extent,interdigitation of contrasting land uses,and the linked spatial relations between nominally urban and nominally rural areas.(2)The new concept of the continuum of urbanity emphasizes the shifts in livelihood and lifestyle driven by regional and global teleconnections and their joint effects on local environments and *** these frameworks suggest a common conceptual structure for addressing urban areas of different ages,sizes,forms,and dynamics in both urbanizing and urbanized areas in developing and developed countries and *** synthesis of frameworks points to empirical research needs,and has the potential to better match sustainability plans and actions with the diverse urban forms and dynamics now appearing around the world.

关键词： development globalization megaregion sustainable city urban ecology urban theory urbanization

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Mechanism of micro-wetting of highly hydrophobic coal dust in underground mining and new wetting agent development

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International Journal of Mining Science and Technology 2023年第1期33卷 31-46页

作者： Mingzhong Gao Hongmei Li Yun Zhao Yiting Liu weiqi zhou Luming Li Jing Xie Jie Deng State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences Geothermal Energy Exploitation and UtilizationInstitute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China College of Food and Bioengineering Chengdu UniversityChengdu 610106China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

The internal mechanism of the high hydrophobicity of the coal samples from the Pingdingshan mining area was studied through industrial,element,and surface functional group *** testing and molecular dynamics simulations were employed to study the impact of three types of surfactants on the surface adsorption properties and wettability of highly hydrophobic bituminous *** results show that the surface of highly hydrophobic bituminous coal is compact,rich in inorganic minerals,and poorly wettable and that coal molecules are dominated by hydrophobic functional groups of aromatic rings and aliphatic *** wetting performance of surfactants as the intermediate carrier to connect coal and water molecules is largely determined by the interaction force between surfactants and coal(Fs-c)and the interaction force between surfactants and water(Fs-w),which effectively improve the wettability of modified coal dust via modifying its surface electrical properties and surface energy.A new type of wetting agent with a dust removal rate of 89%has been developed through discovery of a compound wetting agent solution with optimal wetting and settling *** paper provides theoretical and technical support for removing highly hydrophobic bituminous coal dust in underground mining.

关键词： Dust removal technology Bituminous coal dust New dust suppressant Mine safety Molecular dynamics

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