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Investigation of spatiotemporal distribution and formation mechanisms of ozone pollution in eastern Chinese cities applying convolutional neural network

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Journal of Environmental Sciences 2025年第2期148卷 126-138页

作者： Qiaoli Wang Dongping Sheng Chengzhi Wu Xiaojie Ou Shengdong Yao Jingkai Zhao Feili Li Wei Li Jianmeng Chen 无 College of Environment Zhejiang University of TechnologyHangzhou 310032China Key Laboratory of Biomass Chemical Engineering of the ministry of Education Institute of Industrial Ecology and EnvironmentCollege of Chemical and Biological EngineeringZhejiang University(Zijingang Campus)Hangzhou 310027China Trinity Consultants Inc.(China office)Hangzhou 310012China Zhejiang University of Science&Technology Hangzhou 310023China

Severe ground-level ozone(O_(3))pollution over major Chinese cities has become one of the most challenging problems,which have deleterious effects on human health and the sustainability of *** study explored the spatiotemporal distribution characteristics of ground-level O_(3) and its precursors based on conventional pollutant and meteorological monitoring data in Zhejiang Province from 2016 to ***,a high-performance convolutional neural network(CNN)model was established by expanding the moment and the concentration variations to general ***,the response mechanism of O_(3) to the variation with crucial influencing factors is explored by controlling variables and interpolating target *** results indicated that the annual average MDA8-90th concentrations in Zhejiang Province are higher in the northern and lower in the *** the wind direction(WD)ranges from east to southwest and the wind speed(WS)ranges between 2 and 3 m/sec,higher O_(3) concentration prone to *** different temperatures(T),the O_(3) concentration showed a trend of first increasing and subsequently decreasing with increasing NO_(2) concentration,peaks at the NO_(2) concentration around 0.02mg/m^(3).The sensitivity of NO_(2) to O_(3) formation is not easily affected by temperature,barometric pressure and dew point ***,there is a minimum IRNO_(2) at each temperature when the NO_(2) concentration is 0.03 mg/m^(3),and this minimum IRNO_(2) decreases with increasing *** study explores the response mechanism of O_(3) with the change of driving variables,which can provide a scientific foundation and methodological support for the targeted management of O_(3) pollution.

关键词： Ozone Spatiotemporal distribution Convolutional neural network Ozone formation rules Incremental reactivity

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Historic Center of Macao: Blend of Ancient and Modern Flavors

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中国新闻发布(英文版) 2025年第1期 21-24页

作者： Li Zhichao Ju Dedong the China Academy of Urban Planning and Design the research branch for the protection and development of historical and cultural cities of the China Academy of Urban Planning and Design

Editor's Note: “Civilizations have become richer and more colorful with exchanges and mutual learning. Such exchanges and mutual learning form an important drive for human progress and global peace and development.”This is what Chinese President Xi Jinping said in his speech at the headquarters of the United Nations Educational, Scientific and Cultural Organization on March 27, 2014.

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Torsional vibration of a pipe pile in transversely isotropic saturated soil

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 509-517页

作者： Zheng Changjie Hua Jianmin Ding Xuanming College of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of cities in Mountain Area (Chongqing University) Ministry of Education

This study considers the torsional vibration of a pipe pile in a transversely isotropic saturated soil layer. Based on Biot＇s poroelastic theory and the constitutive relations of the transversely isotropic medium, the dynamic governing equations of the outer and inner transversely isotropic saturated soil layers are derived. The Laplace transform is used to solve the governing equations of the outer and inner soil layers. The dynamic torsional response of the pipe pile in the frequency domain is derived utilizing 1D elastic theory and the continuous conditions at the interfaces between the pipe pile and the soils. The time domain solution is obtained by Fourier inverse transform. A parametric study is conducted to demonstrate the influence of the anisotropies of the outer and inner soil on the torsional dynamic response of the pipe pile.

关键词： torsional vibration saturated soil pipe pile transversely isotropic medium

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Experimental and analytical studies on the vibration serviceability of long-span prestressed concrete floor

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 417-428页

作者： Cao Liang Liu Jiepeng Li Jiang Zhang Ruizhi School of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of cities in Mountain Area (Chongqing University) Ministry of Education

An extensive experimental and theoretical research study was undertaken to study the vibration serviceability of a long-span prestressed concrete floor system to be used in the lounge of a major ***,jumping impact tests were carried out to obtain the floor’s modal parameters,followed by an analysis of the distribution of peak *** tests were also performed to capture the acceleration *** prestressed concrete floor was found to have a low fundamental natural frequency（≈8.86 Hz）corresponding to the average modal damping ratio of≈2.17%.A coefficients plate with simply-supported *** calculated analytical results（natural frequencies and root-mean-square acceleration）agree well with the experimental *** analytical approach is thus validated.

关键词： vibration serviceability prestressed concrete floor airport lounge theoretical analysis modal superposition method

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Seismic behavior of thin-walled circular and stiffened square steel tubed-reinforced-concrete columns

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Science China(Technological Sciences) 2019年第3期62卷 511-520页

作者： GAN Dan ZHOU XuHong LIU JiePeng LI Jiang Key Laboratory of New Technology for Construction of cities in Mountain Area (ministry of Education) Chongqing University School of Civil Engineering Chongqing University

Steel tubed-reinforced-concrete(TRC) columns have been gradually used in the construction of high-rise buildings recently because of their high axial load-carrying capacities and excellent seismic behavior. Existing studies about their seismic behavior were focused on columns with relatively thick tubes, i.e., diameter-to-thickness/width-to-thickness(D/t) ratios were below 100,while little is known about thin-walled TRC columns, especially for square TRC columns. Considering the infilled concrete of square TRC columns is non-uniformly and non-effectively confined, accordingly, stiffened square TRC columns are usually adopted in practice. Thus, two thin-walled circular TRC columns(D/t=120) and two stiffened square ones with diagonal stiffeners in plastic hinge regions(D/t=106) were tested under a constant axial compression combined with cyclic lateral *** the circular and stiffened square TRC columns had the same cross sectional area, tube thickness, reinforcing bar ratio and column height. Flexural failure occurred for all the four specimens. Test results showed the strengths of the stiffened square TRC columns were a little higher in comparison to their circular counterparts; the ductility and energy dissipation capacities were excellent for both the stiffened and circular TRC columns, indicating very good confinement was gained from the yielded steel tubes of the plastic hinge regions at the peak loads. And shear stresses(35–90 MPa) in the sheared plates showed their moderate contribution of carrying lateral loads. Finally, cross sectional capacity analysis results demonstrated the method for TRC columns is acceptable for the stiffened square TRC columns.

关键词： steel tubed-reinforced-concrete column concrete filled steel tube composite column cyclic behavior steel jacket

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Landslide-oriented disaster resilience evaluation in mountainous cities: A case study in Chongqing, China

Resilient Cities and Structures

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Resilient cities and Structures 2024年第4期3卷 34-51页

作者： Junhao Huang Haijia Wen Zhuohang Li Yalan Zhang Key Laboratory of New Technology for Construction of cities in Mountain Area of the ministry of Education National Joint Engineering Research Center for Prevention and Control of Environmental GeoHazards in the TGR AreaSchool of Civil EngineeringChongqing UniversityChongqing 400045China

Natural and human-made disasters are threatening cities around the *** resilience of cities plays a critical role in disaster risk response and post-disaster *** mountainous cities,landslides are among the most frequent and destructive *** study presents a novel methodological framework for assessing the spatial resilience of mountainous cities specifically against *** on Chongqing in the Three Gorges Reservoir region,this study conceptually divides the disaster resilience of mountain cities to landslides into two dimensions:environmental resilience and social *** study developed a comprehensive database by compiling data from 4,464 historical landslide events,incorporating 17 environmental resilience indicators and 16 social resilience *** forest(RF)model was employed to evaluate environmental resilience,achieving a high AUC of 0.968 and an accuracy of 97.1%.Social resilience was assessed by the Analytic Hierarchy Process(AHP),and comprehensive resilience was ranked by the Technique for Order of Preference by Similarity to Ideal Solution(TOPSIS).Key findings include:(1)Establishing a multi-dimensional resilience indicator system that effectively assesses landslide-oriented resilience in mountainous cities.(2)Comprehensive resilience in mountainous cities exhibit distinct spatial clustering *** with lower environmental resilience are mainly characterized by high rainfall and complex *** social resilience concentrated in city centers,while peripheral regions face challenges due to weaker economies and inadequate healthcare infrastructure.(3)In the future development of mountain cities,comprehensive and sustainable strategies should be adopted to balance the relationship between environmental resilience and social *** study provides a robust framework for disaster prevention and resilience assessment in mountainous cities,which can be applied to evaluate the disaster r

关键词： Landslides Resilience cities Machine learning Mountainous cities

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Mechanical characteristics of intact Middle Pleistocene Epoch loess in northwestern China

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Journal of Central South University 2012年第4期19卷 1163-1168页

作者：钟祖良刘新荣 College of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of cities in Mountain Area of ministry of Education Chongqing University

In order to research the mechanical characteristics of intact Middle Pleistocene Epoch loess, triaxial shear tests and isotonic compression test of intact Middle Pleistocene Epoch loess were conducted by improved SJ-IA triaxial shear equipment. According to test results, it can be found that the intact Middle Pleistocene Epoch loess has the properties of shear dilatancy and shear shrinkage. With the increase of confining pressure, stress-strain curve develops from softening to hardening. The failure mode of intact Middle Pleistocene Epoch loess is shear failure with the rupture angle between 55° and 61°. And it is better to determine the yield stress （py, qy） of the intact loess under different confining pressures by using the εv-q/p curve. Along with the increase of confining pressure, yield deviatoric stress qy and yield spherical stress py present logarithmic relationship. Besides, the strength parameters, elastic modulus K and G of intact loess, are obtained, which are benefit for loess projects design.

关键词： yield stress compression testing failure model Middle Pleistocene Epoch loess

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Analysis on thermal measuring of green roof

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Journal of Central South University 2009年第S1期16卷 150-153页

作者：唐鸣放蒋琳 Key Laboratory of New Technology for Construction of cities in Mountain Area Ministry of EducationChongqing University

Comparison of thermal performance between a green roof room and a bare roof room was presented during the cooling period in Shanghai. The results show that the electricity can be saved about 0.08 kW·h/(d·m2),and the heat flux can be reduced by about 70%; the inner surface temperature variation is about 1.0 ℃ comparing with the indoor temperature when using the green roof,and the extra equivalent heat resistance is 1.0 m2·K/W.

关键词： green roof energy saving thermal measuring

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Application of transparent soil model tests to study the soil-rock interfacial sliding mechanism

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Journal of Mountain Science 2019年第4期16卷 935-943页

作者： WANG Zhuang LI Chi DING Xuan-ming Department of Civil Engineering Inner Mongolia University of Technology Key Laboratory of New Technology for Construction of cities in Mountain Area Ministry of Education Chongqing University

When transparent soil technology is used to study the displacement of a slope, the internal deformation of the slope can be visualized. We studied the sliding mechanism of the soil-rock slope by using transparent soil technology and considering the influence of the rock mass Barton joint roughness coefficient, angle of the soil mass, angle of the rock mass and soil thickness factors on slope stability. We obtained the deformation characteristics of the soil and rock slope with particle image velocimetry and the laser speckle technique. The test analysis shows that the slope sliding can be divided into three parts: displacements at the top, the middle, and the bottom of the slope; the decrease in the rock mass Barton joint roughness coefficient, and the increase in soil thickness, angles of the rock mass and soil mass lead to larger sliding displacements. Furthermore, we analyzed the different angles between the rock mass and soil thickness. The test result shows that the displacement of slope increases with larger angle of the rock mass. Conclusively, all these results can help to explain the soil-rock interfacial sliding mechanism.

关键词： Slope engineering Transparent soil Model test Interfacial sliding mechanism

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Insight into the particle shape on the impact of dry granular flow against a rigid barrier: A DEM study

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Journal of Earth Science 2025年

作者： Rui-Xiao Zhan Dong Su Xiang-Sheng Chen Yuan-Jun Jiang Guo-Ping Lei Jing-Jing Yu Key Laboratory for Resilient Infrastructures of Coastal cities (MOE)， Shenzhen University College of Civil and Transportation Engineering， Shenzhen University School of Architecture and Urban Planning， Shenzhen University Shenzhen Key Laboratory of Green， Efficient and Intelligent Construction of Underground Metro Station， Shenzhen University Institute of Mountain Hazards and Environment， Chinese Academy of Sciences School of Transportation， Civil Engineering & Architecture， Foshan University

The effect of particle shape on the impact of dry granular flow remains an open area for further investigation. Five distinct particle shapes were examined in this study using discrete element simulations after calibrating the numerical model using a published work. The findings indicated that the particle shape had a significant influence on granular mobility. With negligible variations in normalized kinetic energy between particles of different shapes， the effect of particle shape on the increasing rate of kinetic energy became more obvious. All irregular particle scenarios had longer accumulated particle lengths down the channel than spherical particles. Variations in particle shape led to adjustments in the distribution of impact forces on the barrier. These findings substantially enhance our understanding of the distinctive effects of particle shapes on the impact mechanism of dry granular flow.

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