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Application of Water Quality Index in the Evaluation of an Abandoned Mine Areas of Xunwu, China

IOP Conference Series: Earth and Environmental Science 2021年第1期668卷

作者： Shiyun Yin Zuwen Liu Shi Yang Yuan Lin Jiangxi Key Laboratory of Environmental Geotechnical and Engineering Disaster Control Ganzhou 341000 China Engineering Technology Research Center for Water Quality Safety Assurance of Ganjiang River Basin Jiangxi University of Science and Technology Ganzhou 341000 China

Within the display think about, an surrendered ion-type rare soil mine contains a tremendous affect on the encompassing water environment contamination in Xunwu, jiangxi province, China. Since the usage of coordinates remediation innovation and extend in 2018, its natural quality has been enormously moved forward. In arrange to encourage assess the environmental remediation impact, a altered water quality index strategy (WQI) is proposed. Concurring to the grid method, 16 water quality examining focuses were set within the surrendered mine remediation extend, and 9 key assessment records such as NH4+-N and heavy metals were chosen for principal component analysis (PCA) and factor analysis (FA), in arrange to comprehensively assess the worldly and spatial changes of different contamination variables within the deserted mine environmental remediation range. The results uncovered that the water quality of the surface water has been slowly progressed, and the generally water quality has been getting superior, among which the water quality in August is clearly superior than that in July, and the progressed water quality index is successful for the classification of water quality and the assessment of the transient and spatial changes of water quality within the remediation of surrendered mines.

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Sealing System Analysis of Rotary Piston Pump

Sealing System Analysis of Rotary Piston Pump

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2019 4th International Conference on Mechanical, Manufacturing, Modeling and Mechatronics (IC4M 2019) & 2019 4th International Conference on Design engineering and Science (ICDES 2019)

作者： M Li X Zhang W Yang J Zhang Z Zhou Shandong University Research Center of Geotechnical and Structural Engineering Chalmers University of Technology Department of Architecture and Civil Engineering Beihang University School of Transportation Science and Engineering Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control

Rotary piston pump is designed by the Wankel engine. The structure, working feature and sealing system of rotary piston pump are introduced. The mathematical model of the internal cylinder profile and the theoretical flow are obtained by analysing the structural characteristics of the new pump. The axial seal and face seal of the rotary piston pump and their structures are analysed. The force analysis of the sealing strip is carried out in various cases. It can be concluded from the analysis that, for axial sealing, the key parameters that affect seal strip wear are working pressure, rotate speed of the crankshaft and the friction coefficient between sealing strip and inner wall of the cylinder. For axial sealing, the force of the spring under the curved sealing strips, the size of the sealing rings and curved sealing strips and material of them are the key design parameters.

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Uncertainty Estimation of Location Information under Vehicle-Vehicle Cooperative control 18

Uncertainty Estimation of Location Information under Vehicle...

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18th COTA International Conference of Transportation Professionals: Intelligence, Connectivity, and Mobility, CICTP 2018

作者： Zhai, Junda Lu, Guangquan Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control School of Transportation Science and Engineering Beihang Univ. Beijing100191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies SiPaiLou #2 Nanjing210096 China

ISBN: (数字)9780784481523

ISBN: (纸本)9780784481523

With the rapid development of vehicle intelligence and communication technology, vehicle-vehicle cooperative technology plays an increasingly important role in intelligent transportation systems. The core of vehicle-vehicle cooperative technology is the vehicle movement state data collection and interaction. In traditional vehicle data processing, GPS data is mostly filtered, and the output is a single set value. In this study, an extended Kalman filter was used to filter out the uncertainty of vehicle's motion state data, except for a single determinant, and the approximate distribution of the data was obtained. Through these distributions, the Monte Carlo method is used to calculate the safety evaluation indexes including time to collision, time headway, and safety margin. Fitting the evaluation index with the common distribution, the results show that the safety evaluation index is subject to the Burr distribution. © 2018 American Society of Civil Engineers.

关键词： Kalman filters

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A traffic network capacity reliability considering mean-excess travel time with perception error 17

A traffic network capacity reliability considering mean-exce...

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17th COTA International Conference of Transportation Professionals: Transportation Reform and Change - Equity, Inclusiveness, Sharing, and Innovation, CICTP 2017

作者： Zhang, Junjie Wang, Yunpeng Lu, Guangquan Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control School of Transportation Science and Engineering Beihang Univ. Beijing100191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies SiPaiLou 2 Nanjing210096 China

ISBN: (数字)9780784480915

ISBN: (纸本)9780784480915

An essential factor that affects the travelers' route choice behavior is travel time variability, as indicated by empirical studies. Travel time variability elaborates both reliability and unreliability aspects. The concept of mean-excess travel time can capture this characteristic of travel time variability, which is one of the most widely used measures for assessing transportation network performance. Moreover, the travelers' route choice decisions are based on the perceived travel time rather than the actual travel time. Therefore, this paper firstly presents a traffic equilibrium model based on the mean-excess travel time with stochastic perception errors that explicitly considers road network capacity in the route choice process. Thus, an acceptable capacity exceedance probability will be considered in a degradable road network. The network traffic capacity model based on mean-excess travel time with perception error is presented. Finally, numerical studies on a small network are provided to illustrate performances of the network. © ASCE.

关键词： Travel time

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Perception and Response Characteristics of Pedestrian-Vehicle Traffic Conflict at Unsignalized Intersections under Driving Distraction 18

Perception and Response Characteristics of Pedestrian-Vehicl...

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18th COTA International Conference of Transportation Professionals: Intelligence, Connectivity, and Mobility, CICTP 2018

作者： Zhao, Pengyun Lu, Guangquan Liang, Liming Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control School of Transportation Science and Engineering Beihang Univ. Beijing100191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies SiPaiLou #2 Nanjing210096 China

ISBN: (数字)9780784481523

ISBN: (纸本)9780784481523

Drivers' driving behaviors play a very important role in road traffic safety and are affected by driver distraction. However, the research on driver distraction mostly focuses on high-speed situation and closed sections;there is a lack of research on low-speed situation and open sections. There are few studies on crash or near-crash scenarios. In this paper, we choose pedestrian-vehicle traffic conflict at unsignalized intersections to study the effect of two driver distractions - auditory-cognitive distraction and visual-cognitive distraction - on drivers' perception and reaction to traffic conflicts. We adopt the multivariate analysis method to explore the effect of different kinds of driver distraction on drivers' perception and reaction in the traffic conflict. Analytical results show that driver distraction significantly delays the driver's action response time. However, driver distraction has no significant effect on the driver's emotional perception stage, but the driver's emotion perception time of conflicts has obvious lag. © 2018 American Society of Civil Engineers.

关键词： Behavioral research

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Research on Settlement control of New and Old Highway Roadbed Based on Different Bench Excavation Dimensions

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IOP Conference Series: Earth and Environmental Science 2021年第2期714卷

作者： Yang Gao Xue Lin Zhenyue Shi Qingbiao Wang Yanbo Jiang Xinyue Zhao Kun Wu Xinyuan Li Jie Zhang Junjie Zhang College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao China College of Safety and Environmental Engineering (College of Safety and Emergency Management) Shandong University of Science and Technology Qingdao China College of Resources Shandong University of Science and Technology Tai'an 271019 China College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266590 China College of Safety and Environmental Engineering (College of Safety and Emergency Management) Shandong University of Science and Technology Qingdao 266590 China National Engineering Laboratory for Coalmine Backfilling Mining Shandong University of Science and Technology Tai'an 271019 China Geotechnical and Structural Engineering Research Center Shandong University Jinan China State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China

The reconstruction and expansion of expressways is an important means, and how to control the settlement deformation of the subgrade width is an urgent problem to be solved. Step splicing is an effective means to control settlement. Therefore, it is very important to study the size of the steps. Expansion is based on engineering. Through literature research, numerical simulation and other research methods, combined with theoretical knowledge of soil mechanics, the settlement control of widened roadbed in highway reconstruction and expansion is studied, and the following conclusions are obtained: (1) Three different types are studied. The deformation law of subgrade and foundation top surface of step size; (2) A combined subgrade step excavation method is proposed, which provides a reference for similar projects. (3) The method of excavation and splicing of combined subgrade steps was verified, and the correctness of combined subgrade excavation and splicing was verified.

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Vehicle Trajectory Reconstruction and Home Places Estimation from Monitoring Data 18

Vehicle Trajectory Reconstruction and Home Places Estimation...

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18th COTA International Conference of Transportation Professionals: Intelligence, Connectivity, and Mobility, CICTP 2018

作者： Yu, Haiyang Yang, Shuai Liu, Shuai Ren, Yilong School of Transportation Science and Engineering Beihang Univ. Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control 37 Xueyuan Rd. Haidian District Beijing100191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies SiPaiLou #2 Nanjing210096 China

ISBN: (数字)9780784481523

ISBN: (纸本)9780784481523

Analyzing vehicle travel information and roadway network traffic state of perception data has been a popular research topic. In order to excavate the vehicle travel characteristics in the city of Rui'an from monitoring data, we proposed a trajectory reconstruction model integrated into the OWA (ordered weighted averaging) and setting four attributes to solve trajectory records missing phenomenon, we verified the model's reliability through actual experiments. Then we devised a method combining two algorithms to estimate the important places of each individual vehicle based on the reconstructed vehicles trajectory. Our results showed that the method using the K-means algorithm makes good predictions: 97% of the distances between the actual places and estimated places are within 2 km. Both the trajectory reconstruction and home places estimation will provide data support for studying vehicle commuting and road network characteristics. © 2018 American Society of Civil Engineers.

关键词： Vehicles

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Exploring temporal characteristics of bus trips in Tian'anmen area using smart card data 17

Exploring temporal characteristics of bus trips in Tian'anme...

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17th COTA International Conference of Transportation Professionals: Transportation Reform and Change - Equity, Inclusiveness, Sharing, and Innovation, CICTP 2017

作者： Xiong, Ying Lu, Guangquan Ma, Xiaolei Liu, Haode Liu, Xianglong Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control School of Transportation Science and Engineering Beihang Univ. Beijing100191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies SiPaiLou #2 Nanjing210096 China China Urban Sustainable Transport Research Center China Academy of Transportation Sciences Beijing100013 China

ISBN: (数字)9780784480915

ISBN: (纸本)9780784480915

Understanding the daily temporal pattern of bus trips is very significant for both operators and passengers. However, few studies have focused on popular areas like the Tian'anmen area. To fill this gap, this paper empirically analyzes the temporal patterns of human bus trips in the Tian'anmen area using smart card data. In addition, we proposed crowding indicators at three levels, the vehicle, link, and network levels, to make a quantitative analysis of bus networks. At the network level, we consider the importance of links. The entropy method is used to assign weights. The results indicate (a) transit ridership increases on May Day on some stops;(b) the temporal patterns of bus travel in weekdays are similar and stable, and there is a significant difference in holidays;(c) the crowding indicators we propose are appropriate. The empirical analysis and the crowding measure give us a deep and comprehensive view of Tian'anmen area bus trips. © ASCE.

关键词： Smart cards

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Application of Glass Fiber Concrete under Thin-Walled Middle Partition Wall Construction in Tunnel

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IOP Conference Series: Earth and Environmental Science 2021年第3期769卷

作者： Yuanyuan Tian Yigong Wang Haixiang Nie Hongyue You Junjie Zhang Tangsha Shao Chuming Pang Xu Zhang Dong Wang Peng Huang Qingbiao Wang College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266590 China College of Resources Shandong University of Science and Technology Tai'an 271019 China College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266590 China National Engineering Laboratory for Coalmine Backfilling Mining Shandong University of Science and Technology Tai'an 271019 China Shandong University Geotechnical and Structural Engineering Research Center Jinan250013 China School of Mechanics and Architecture China University of Mining and Technology (Beijing) Beijing100083 China College of Energy and Mining Engineering Shandong University of Science and Technology Qingdao 266590 China College of Safety and Environmental Engineering (College of Safety and Emergency Management) Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China

Aiming at the feasibility of applying glass fiber concrete as a new material to tunnel engineering, with the help of a combination of theoretical analysis, laboratory tests and engineering applications, the effect of glass fiber on the mechanical properties of concrete under different dosages and different lengths is studied. By monitoring the cracks in the middle partition wall, and applying the glass fiber to the middle partition wall in Laoshan Tunnel, to achieve the verification of the optimal length and the optimal mixing amount. The main conclusions are: (1) When the length of glass fiber is 12 mm, the tensile and compressive strength reach the maximum value; (2) Determine the optimal volume rate is 1% in order to prevent the concrete cracking effectively; (3) The crack resistance of the mid-board with glass fiber concrete is better than the ordinary concrete, which proves the feasibility of practical application of glass fiber concrete.

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Creating bus timetables with maximal synchronization by a new algorithm based on the PSO 17

Creating bus timetables with maximal synchronization by a ne...

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17th COTA International Conference of Transportation Professionals: Transportation Reform and Change - Equity, Inclusiveness, Sharing, and Innovation, CICTP 2017

作者： Tian, Daxin Liu, Wenhao Guo, Peng Rong, Hui Wang, Wenyang Gong, Jinfeng Wang, Yunpeng Liu, He Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang Univ. Beijing100191 China Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control School of Transportation Science and Engineering Beihang Univ. Beijing100191 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Nanjing210096 China Quartermaster Equipment Institute of the General Logistics Dept. of CPLA Beijing100010 China

ISBN: (数字)9780784480915

ISBN: (纸本)9780784480915

This paper addresses the problem of receiving a timetable for a settled network with maximal synchronization. In this paper, a model has been developed to solve the problem which attaches importance to creating a timetable for maximizing their synchronization and enables the transfer of passengers from one route to another with least waiting times at transfer nodes. Next, this problem is formulated as a mixed integer linear programming problem, and a new algorithm based on the traditional particle swarm optimization (PSO) has been developed to solve the problem in a short time. Finally, the relationship of iterative time and the complexity of the given network is qualitatively established. © ASCE.

关键词： Synchronization

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