Searched for: author%3A%22Deng%2C+X.%22
(1 - 16 of 16)
document
Deng, X. (author)
Tidal inlet systems, which consist of back–barrier basins connected to the open sea by one or multiple inlets, are found at many places along sandy coasts. They are valuable for ecology (breeding and feeding areas), economy (gas–mining and sand–mining) and recreation, and are important for coastal safety. But they are also sensitive to external...
doctoral thesis 2023
document
Deng, X. (author), De Mulder, Tom (author), Schuttelaars, H.M. (author)
Channel–shoal patterns are often observed in the back–barrier basins of inlet systems and are important from both an economical and ecological point of view. Focussing on double–inlet systems, the initial formation of these patterns is investigated using an idealized model. The model is governed by the depth–averaged shallow water equations,...
journal article 2022
document
Deng, X. (author), Meerman, C. (author), Boelens, T. (author), De Mulder, T. (author), Salles, P. (author), Schuttelaars, H.M. (author)
The existence of morphodynamic equilibria of double-inlet systems is investigated using a cross-sectionally averaged morphodynamic model. The number of possible equilibria and their stability strongly depend on the forcing conditions and geometry considered. This is illustrated by considering a rectangular double-inlet system forced by M<sub...
journal article 2021
document
Shen, C. (author), Deng, X. (author), Wei, Z. (author), Dollevoet, R.P.B.J. (author), Zoeteman, A. (author), Li, Z. (author)
A singular rail or wheel surface irregularity, such as a squat, insulation joint or wheel flat, can cause large wheelrail impact force. Both the magnitude and frequency content of the impact force need to be correctly modelledbecause they are closely related to the formation, deterioration and detection of such irregularities. In this paper,we...
journal article 2021
document
Deng, X. (author)
One goal of this thesis is to study the performance and accuracy of an explicit finite element (FE) method for frictional rolling contact in a wider-range of conditions. The other goal is to reveal the physical phenomena of squats and the mechanisms behind, such as cracking mechanisms and development process. The first part studies the...
doctoral thesis 2019
document
Yang, Z. (author), Deng, X. (author), Li, Z. (author)
The modeling of dynamic frictional rolling contact is crucial for accurately predicting behavior and deterioration of structures under dynamic interactions such as wheel/rail, tire/road, bearings and gears. However, reliable modeling of dynamic frictional rolling contact is challenging, because it requires a careful treatment of friction and...
journal article 2019
document
Deng, X. (author), Li, Z. (author), Qian, Zhiwei (author), Zhai, Wanming (author), Xiao, Qian (author), Dollevoet, R.P.B.J. (author)
Weld-induced squats are a major damage type in high-speed railways as well as in conventional railways. They incur high maintenance costs and endanger operational safety. This paper first presents and analyzes five-year continual field monitoring observations and measurements of squats at rail welds. A hypothesis of the formation and development...
journal article 2019
document
Deng, X. (author), Qian, Zhiwei (author), Li, Z. (author), Dollevoet, R.P.B.J. (author)
Rail squats originate from a number of sources, such as corrugations, indentations and welds. A five-year continual field monitoring study was performed on squats induced by corrugations. This study indicated that a small black depression formed at the corrugation under wheel-rail dynamic forces, and then, a primary crack typically initiated...
journal article 2018
document
Deng, X. (author), Qian, Zhiwei (author), Li, Z. (author), Dollevoet, R.P.B.J. (author)
The half-space assumption has been employed in many solution methods for non-conforming contact problems in elasticity such as the Hertz theory and the Kalker's variational theory. It is generally believed that to guarantee acceptable accuracy in these half-space-based methods, the characteristic size (twice length of one semi-axis) of the...
journal article 2017
document
Deng, X. (author)
The Shenzhen planning system has been effective in promoting economic growth through the prodigious urbanization of land. It has given priority to the ‘macro-level’ planning goals of economic growth through physical development. Questions can be raised about the physical and social outcomes from the development process at the ‘micro-level’, not...
conference paper 2015
document
Deng, X. (author), Naeimi, M. (author), Li, Z. (author), Qian, Z. (author)
A modeling procedure to predict the residual fatigue life of rail at squats seeds is developed in this article. Two models are involved: a 3D explicit Finite Element (FE) model to compute the stress and strain at squats in rail, and the J-S fatigue damage model to determine the residual fatigue life on the basis of the computed stress and strain...
conference paper 2014
document
Qian, Z. (author), Deng, X. (author), Li, Z. (author), Dollevoet, R.P.B.J. (author)
The rolling contact of elastic bodies (upper body and lower body) can be analyzed with the Hertz theory and the Kalker’s model. It is generally believed that the width of the contact area should be much smaller than the characteristic size of each elastic body, to ensure that the half-space assumption is valid. However the definition of “much...
conference paper 2014
document
Zhang, J.L. (author), Deng, X. (author), Feng, X. (author), Han, N.X. (author), Jonkers, H.M. (author)
The CaCO3-mineralizing bacteria from different taxonomic groups have shown potential in restoration of construction material such as concretes, cements and stony materials. However, these strains are far from the demand of practical application due to some shortages, including the low mineralizing capacity. In this work, an integrated high...
conference paper 2013
document
Zhang, J.L. (author), Deng, X. (author), Feng, X. (author), Han, N.X. (author), Jonkers, H.M. (author)
The CaCO3-mineralizing bacteria from different taxonomic groups have shown potential in restoration of construction material such as concretes, cements and stony materials. However, these strains are far from the demand of practical application due to some shortages, including the low mineralizing capacity. In this work, an integrated high...
conference paper 2013
document
Deng, X. (author)
Vanwege vertrouwelijke informatie of andere redenen is slechts een deel van de publicatie opgenomen in de repository. Due to confidential information or other reasons only a part of the publication is presented in the repository. Doherty Power Amplifier (DPA) is employed to improve the efficiency when operated with complex modulated signals. Due...
master thesis 2010
document
Deng, X. (author)
The ongoing urban plans and designs in China may have provided an improper model of making cities. They do not consider the complex nature of city and take little into consideration of the welfare of people. Then, the question comes, what is a proper model of building cities? A city serves as a receptacle of life. There are various lifestyles co...
master thesis 2010
Searched for: author%3A%22Deng%2C+X.%22
(1 - 16 of 16)