Searched for: author:"Qian, Z."
(1 - 17 of 17)
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Qian, Z. (author), Miedema, Henk (author), Sahin, Sevil (author), de Smet, L.C.P.M. (author), Sudhölter, Ernst J. R. (author)
This study demonstrates the effective separation of alkali metal cations using a Supported Liquid Membrane (SLM) containing lipophilic, negatively charged borate moieties, operating under electro dialysis conditions. The selectivity of the membrane is essentially based on differences in dehydration energy and mobility between ion species. The...
journal article 2020
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Qian, Z. (author), Miedema, H. (author), de Smet, L.C.P.M. (author), Sudhölter, Ernst J. R. (author)
A model is presented for the Na<sup>+</sup> and K<sup>+</sup> levels in the irrigation water of greenhouses, specifically those for the cultivation of tomato. The model, essentially based on mass balances, not only describes the accumulation of Na<sup>+</sup> but includes a membrane unit for the selective removal of Na<sup>+</sup> as well. As...
journal article 2018
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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
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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
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Wang, X. (author), Xing, F. (author), Zhang, M. (author), Han, N. (author), Qian, Z. (author)
The recovery behavior for strength and impermeability of cementitious composites embedded with organic microcapsules was investigated in this study. Mortar specimens were formed by mixing the organic microcapsules and a catalyst with cement and sand. The mechanical behaviors of flexural and compression strength were tested. The results showed...
journal article 2013
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Wang, X. (author), Xing, F. (author), Zhang, M. (author), Han, N. (author), Qian, Z. (author)
A new type of self-healing cementitious composites by using organic microcapsules is designed in Guangdong Key Laboratory of Durability for Coastal Civil Engineering, Shenzhen University. For the organic microcapsules, the shell material is urea formoldehyde (UF), and the core healing agent is Epoxy. The effect of organic microcapsules on...
conference paper 2013
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Wang, X. (author), Xing, F. (author), Zhang, M. (author), Han, N. (author), Qian, Z. (author)
A new type of self-healing cementitious composites by using organic microcapsules is designed in Guangdong Key Laboratory of Durability for Coastal Civil Engineering, Shenzhen University. For the organic microcapsules, the shell material is urea formoldehyde (UF), and the core healing agent is Epoxy. The effect of organic microcapsules on...
conference paper 2013
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Qian, Z. (author), Schlangen, H.E.J.G. (author)
The fracture processes in concrete can be simulated by lattice fracture model [1]. A lattice network is usually constructed on top of the material structure of concrete, and then the mechanical properties of lattice elements are assigned, corresponding with the phases they represent. The material structure of concrete can be obtained...
conference paper 2013
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Qian, Z. (author), Schlangen, E. (author), Ye, G. (author), Van Breugel, K. (author)
Cracking in cement-based materials is usually not easy to predict, because of the complexity of their microstructures. Concrete is a composite material of mortar and coarse aggregates, and mortar consists of cement paste and sands. The fracture processes in these materials are related, and this paper aims to reveal the relationship by developing...
conference paper 2012
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Qian, Z. (author), Ye, G. (author), Schlangen, E. (author), Van Breugel, K. (author)
Concrete is a composite construction material, which is composed primarily of coarse aggregates, sands and cement paste. The fracture processes in concrete are complicated, because of the multiscale and multiphase nature of the material. In the past decades, comprehensive effort has been put to study the cracks evolution in concrete, both...
conference paper 2012
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Qian, Z. (author)
Concrete is a composite construction material, which is composed primarily of coarse aggregates, sands and cement paste. The fracture processes in concrete are complicated, because of the multiscale and multiphase nature of the material. In the past decades, comprehensive effort has been put to study the cracks evolution in concrete, both...
doctoral thesis 2012
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Chen, X. (author), Liu, X. (author), Qian, Z. (author), Lei, Z. (author)
Reliable and durable asphalt surfacing systems still remain to be desired for the long-spanned orthotropic steel bridges as the nationally and internationally reports on distresses in deck pavement. Based on ten-year research works, this paper has presented a brief review and discussion of the Chinese practices and experiences of deck pavement...
conference paper 2012
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Qian, Z. (author), Ye, G. (author), Schlangen, E. (author), Van Breugel, K. (author)
conference paper 2012
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Qian, Z. (author), Schlangen, E. (author), Ye, G. (author), Van Breugel, K. (author)
conference paper 2011
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Qian, Z. (author), Ye, G. (author), Schlangen, H.E.J.G. (author), Van Breugel, K. (author)
Numerical modeling of fracture processes of brittle materials, such as cement paste, mortar, concrete and rocks, started in the late 1960s when the discrete and smeared cracking models were introduced. In the 1990s, Schlangen and van Mier proposed another numerical model to compensate the drawbacks of the discrete and smeared cracking models,...
conference paper 2010
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Qian, Z. (author)
In this MSc thesis project, an effort was made to predict the mechanical properties (especially the tensile strength and stiffness) and crack propagation of cement paste using 3D lattice fracture model at the micro-level. This project consists of three modules, namely “3D Lattice Generation”, “3D Lattice Analysis” and “Interpretation of results”...
master thesis 2008
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Qian, Z. (author)
master thesis 2005
Searched for: author:"Qian, Z."
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