document

The Conversion from CityGML to 3D Property Units

Ying, Shen (author), Jin, Fengzan (author), Guo, Renzhong (author), Li, Lin (author), Yang, Jie (author), Zhou, Yujie (author)

Due to the fast growth of building construction technology and increasing demands on the efficient use of land, human living space are expanded from on the surface to above and under the earth surface. It raises the need for three dimentional (3D) cadastral by realizing that the current cadastral system based on 2D is not appropriate to reflect...

conference paper 2014

document

Visualization for the Coherent Set of 3D Property Units

Ying, Shen (author), Guo, Renzhong (author), Li, Weiyang (author), Yang, Jie (author), Zhao, Zhigang (author), Li, Lin (author)

There are many 3D objects with denser aggregation that they are fully/partly coherent touched with each other through shared facets, which we called coherent set of 3D objects. Visualization for 3D property unit is an effective way to understand 3D spatial occupation, location and relationship in urban space, particularly in the coherent set of...

conference paper 2016

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Online Iterative Adaptive Dynamic Programming Approach for Solving the Zero-Sum Game for Nonlinear Continuous-Time Systems with Partially Unknown Dynamics

Fu, Bin (author), Sun, B. (author), Guo, Hang (author), Yang, Tao (author), Fu, Wenxing (author)

The current study presents an online iterative adaptive dynamic programming approach to resolve the zero-sum game (ZSG) for nonlinear continuous-time (CT) systems containing a partially unknown dynamic. The Hamilton-Jacobian-Issacs (HJI) equation is solved along the state trajectory according to the value function approximation and the policy...

conference paper 2023

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Hydrological Changes of the Irtysh River and the Possible Causes

Huang, F. (author), Xia, Z. (author), Li, F. (author), Guo, L. (author), Yang, F. (author)

Hydrological changes of the Irtysh River were analyzed concerning the changes of annual runoff and its distribution features within a year measured by coefficient of variation and concentration degree. Abrupt changes were detected by the heuristic segmentation method. Possible causes of the hydrological changes were investigated considering...

journal article 2012

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A CAST-Based Analysis of the Metro Accident That Was Triggered by the Zhengzhou Heavy Rainstorm Disaster

Zhao, Jiale (author), Yang, Fuqiang (author), Guo, Yong (author), Ren, X. (author)

Emergency management research is used to deal with the increasing number of extreme weather threats in urban areas. This paper uses causal analysis based on systems theory (CAST) to review the subway water ingress accident and the government's emergency management actions in Zhengzhou, Henan Province, during the heavy rainstorm disaster on 20...

journal article 2022

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Investigating energy performance of large-scale seasonal storage in the district heating system of chifeng city: Measurements and model-based analysis of operation strategies

Xu, L. (author), Guo, Fang (author), Hoes, Pieter-Jan (author), Yang, Xudong (author), Hensen, Jan (author)

This paper presents a modeling and simulation method that supports energy performance assessment and operation strategy investigation of borehole thermal energy storage in the Chifeng district heating (DH) system. A living laboratory in Chifeng, China that integrates a 0.5 million m3 borehole thermal energy storage system, an on-site solar...

journal article 2021

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Recycling waste tyre polymer for production of fibre reinforced cemented tailings backfill in green mining

Guo, Z. (author), Qiu, Jingping (author), Kirichek, Alex (author), Zhou, Hao (author), Liu, C. (author), Yang, Lei (author)

The increasing amount of solid waste, e.g., waste tyres from car industry and tailings from mine operations, causes substantial environmental and societal issues. The recycled tyre polymer fibre (RTPF) reinforced cemented tailings backfill (CTB) is a kind of composite that can treat waste tyres and tailings simultaneously and realize green...

journal article 2023

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Analysis of Railway Ballasted Track Stiffness and Behavior with a Hybrid Discrete-Continuum Approach

Shi, Can (author), Zhao, Chunfa (author), Yang, Yang (author), Guo, Y. (author), Zhang, Xu (author)

Railway ballasted track stiffness is an important indicator to identify supporting condition that ensures that the facility is well designed and functioned. Although many studies have been performed on track stiffness based on experimental tests and finite-element methods, the factors influencing the track stiffness have not been completely...

journal article 2021

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An evaluation of the information literacy of safety professionals

Guo, Y. (author), Tao, Jing (author), Yang, F. (author), Chen, C. (author), Reniers, G.L.L.M.E. (author)

Information literacy has gradually become one of the necessary qualities in current and future safety practices. The calculation and assessment of information literacy of safety professionals is an effective way to understand their information literacy level. This paper, therefore, aims to evaluate the information literacy level of safety...

journal article 2022

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Design and assessments on a hybrid pin fin-metal foam structure towards enhancing melting heat transfer: An experimental study

Liu, Gang (author), Du, Zhao (author), Xiao, Tian (author), Guo, Junfei (author), Lu, Liu (author), Yang, Xiaohu (author), Hooman, K. (author)

Solar energy, as a kind of renewable energy, offers a large reserve to be harvested at a reasonably low cost for engineering applications. To decouple the temporal and spatial relevance of the continuous energy supply of solar energy, latent heat thermal energy storage can deal with this problem at different temperatures. Aiming to improve...

journal article 2022

document

Dynamic Dissociation Behaviors of sII Hydrates in Liquid Water by Heating: A Molecular Dynamics Simulation Approach

Yang, Peihan (author), Guo, Dongdong (author), Fang, B. (author)

An understanding of the dynamic behavior of subtle hydrate dissociation in the liquid water phase is fundamental for gas production from marine hydrate reservoirs. Molecular dynamics simulations are performed in this study to investigate the dissociation kinetics of pure propane and binary propane + methane sII hydrates in a liquid water...

journal article 2022

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The contribution shift of ammonia-oxidizing archaea and bacteria to ammoxidation under Ag-NPs/SWCNTs/PS-NPs stressors in constructed wetlands

Yang, X. (author), Guo, Fucheng (author), Liu, Tao (author), He, Qiang (author), Vymazal, Jan (author), Chen, Yi (author)

Ammonia-oxidizing microorganisms (AOMs, archaea (AOA) and bacteria (AOB)) are primarily responsible for the ammoxidation in constructed wetlands (CWs). However, little is known about evaluating the response of AOA and AOB to engineered nanomaterials (ENMs) and quantifying the shift of their contribution to ammoxidation. Herein, we operated a...

journal article 2023

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An assessment method of rail corrugation based on wheel–rail vertical force and its application for rail grinding

Niu, Liubin (author), Yang, Fei (author), Deng, Xiangyun (author), Zhang, P. (author), Jing, Guoqing (author), Qiang, Weile (author), Guo, Y. (author)

In practice, the assessment and treatment of rail corrugation are quantitatively based on the corrugation depth. Wheel–rail vertical forces (WRVF), as a direct reflection of wheel–rail interaction, can give expression to the corrugation depth and thus serve as a key parameter for assessing the corrugation. In this paper, we propose an...

journal article 2023

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Combined CNN and RNN Neural Networks for GPR Detection of Railway Subgrade Diseases

Liu, Huan (author), Wang, Shilei (author), Jing, Guoqing (author), Yu, Ziye (author), Yang, Jin (author), Zhang, Yong (author), Guo, Y. (author)

Vehicle-mounted ground-penetrating radar (GPR) has been used to non-destructively inspect and evaluate railway subgrade conditions. However, existing GPR data processing and interpretation methods mostly rely on time-consuming manual interpretation, and limited studies have applied machine learning methods. GPR data are complex, high...

journal article 2023

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Data-driven ballast layer degradation identification and maintenance decision based on track geometry irregularities

Zhao, Wenbo (author), Qiang, Weile (author), Yang, Fei (author), Jing, Guoqing (author), Guo, Y. (author)

Ballast layer defects are the primary cause for rapid track geometry degradation. Detecting these defects in real-time during track inspections is urgently needed to ensure safe train operations. To achieve this, an indicator, the track degradation rate (TDR) was proposed. This rate is calculated using track geometry inspection data to locate...

journal article 2023

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Slight Multielement Doping-Induced Structural Order-Disorder Transition for High-Performance Layered Na-Ion Oxide Cathodes

Guo, Hao (author), Zhao, C. (author), Gao, Jianxiang (author), Yang, Wenyun (author), Hu, Xufeng (author), Ma, Xiaobai (author), Jiao, Xuesheng (author), Yang, Jinbo (author), Sun, Kai (author), Chen, Dongfeng (author)

To realize concurrently the high-energy density and excellent cycling stability, maximum utilization of redox couple, minimization of detrimental phase transition, and structural degradation of O3-type layered oxide cathodes are critical for developing Na-ion batteries. Ni²⁺/Ni⁴⁺ redox couple showing multielectron...

journal article 2023

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Assessment of ballast layer under multiple field conditions in China

Guo, Y. (author), Wang, Shilei (author), Jing, Guoqing (author), Yang, Fei (author), Liu, Guixian (author), Qiang, Weile (author), Wang, Yan (author)

Ballast layer condition should be more regularly and accurately inspected to ensure safe train operation; however, traditional inspection methods cannot sufficiently fulfil this task. This paper presents a method of ground penetrating radar (GPR) application to reflect ballast layer fouling levels under diverse field conditions (annual gross...

journal article 2022

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Poly-crystalline silicon-oxide films as carrier-selective passivating contacts for c-Si solar cells

Yang, G. (author), Guo, Peiqing (author), Procel Moya, P.A. (author), Weeber, A.W. (author), Isabella, O. (author), Zeman, M. (author)

The poly-Si carrier-selective passivating contacts (CSPCs) parasitically absorb a substantial amount of light, especially in the form of free carrier absorption. To minimize these losses, we developed CSPCs based on oxygen-alloyed poly-Si (poly-SiO_x) and deployed them in c-Si solar cells. Transmission electron microscopy analysis...

journal article 2018

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High-efficiency black IBC c-Si solar cells with poly-Si as carrier-selective passivating contacts

Yang, G. (author), Guo, Peiqing (author), Procel Moya, P.A. (author), Limodio, G. (author), Weeber, A.W. (author), Isabella, O. (author), Zeman, M. (author)

In this work, we present the application of poly-Si carrier-selective passivating contacts (CSPCs) as both polarities in interdigitated back-contacted (IBC) solar cell architectures. We compared two approaches to form a gap between the back-surface field (BSF) and emitter fingers. It is proved that the gaps prepared by both approaches are...

journal article 2018

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Macro-meso dynamic analysis of railway transition zone: Hybrid DEM/FDM simulation and experimental validation

Shi, Can (author), Zhao, Chunfa (author), Yang, Yang (author), Guo, Y. (author), Zhang, Xu (author), Feng, Yang (author)

To probe into the mechanical behaviour of railway transition zone from the macro-meso aspects, a numerical model of transition zone is built that hybrids the Discrete Element Method (DEM) and Finite Difference Method (FDM). The DEM is utilised to simulate the ballast bed and sleeper, because it can consider the realistic ballast shapes and...

journal article 2020