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Xu, H. (author), Yu, M. (author), Huang, H. (author), Fan, Y. (author)
The original urban planning can never meet the requirements of the rapid development and the increasing population in big cities in China. The best way to solve this problem is to develop the underground space (including tunnels). With the exhaustion and saturation of the shallow underground space, the development of urban area is more and more...
conference paper 2015
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In 3D turbulent flows, the direct cascade of energy, characterized by a flux through scales, ε, is a strong source of irre- versibility. This irreversibility manifests itself in the asymmetry between negative and positive kinetic energy differences along particle trajectories. In particular, it is observed that the odd moments of the power of...
conference paper 2015
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We investigate the response of energy flux in isotropic turbulence to step-function like perturbation in external forcing at large length scales. From both physical experiments and direct numerical simulations, we measured the evolution of the Eulerian velocity structure functions, such as $D_{LL}(r)$, $D_{NN}(r)$, before and after the...
conference paper 2015
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We here present the results of a measurement campaign at the Umweltforschungsstation Schneefernerhaus (UFS) research station at an elevation of 2650 m, on the mountain top of Zugspitze, Germany. We measured the three-dimensional motion of the water droplets inside a turbulent cloud using three high-speed stationary cameras. We show the...
conference paper 2015
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The optimal transient growth process in a particle-laden channel flow is studied under the influence of the linear feedback control. The equilibrium Eulerian approach with the assumption that the particles are small and spherical is adopted. The effect of initial distribution of particles on the optimal transient growth of perturbations is...
conference paper 2015
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Chen, Z. (author), Xu, Z. (author), Wang, G. (author), Li, H. (author), Chen, B. (author), Zeng, X.C. (author), Tan, L. (author)
Crystalline solids are solid materials whose constituent atoms, molecules, or ions are arranged in a highly regulated fashion. Due to lack of rotational freedom in their stacking, they have been known as fragile materials. Even though some efforts have been dedicated to bind or mend defects/cracks in amorphous materials like concrete or polymers...
conference paper 2013
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McNamara, A.M. (author), Divall, S. (author), Goodey, R.J. (author), Gorasia, R.J. (author), Halai, H. (author), Rose, A.V. (author), Stallebras, S.E. (author), Taylor, R.N. (author), Xu, M. (author)
The London Geotechnical Centrifuge Centre located at City University, London is one of four currently active centrifuges in the UK. The centrifuge is well used and much of the geotechnical research at City University employs physical modelling but supported by a large element testing facility and numerical modelling capability. The centre was...
conference paper 2012
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Xu, P. (author), Chan, E.H.W. (author)
Building sector contributes a large part of total energy consumption. Building Energy Efficiency Retrofit (BEER) is an effective approach to save energy & reduce emission of CO2 and improve sustainability of existing buildings. Energy Performance Contracting (EPC), a market oriented mechanism provided by Energy Service Companies (ESCOs), has...
conference paper 2011
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Tian, H.Y. (author), Cai, H.M. (author), Xu, X. (author), Lai, J.H. (author)
Removing noise effectively without destroying important fine structure is a challenging problem in image processing. Among many techniques, diffusion method is shown to be attractive due to its rigorous mathematical background and efficiency. In this paper we propose a well-balanced diffusion method by redefining the diffusion and regularization...
conference paper 2011
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Guillen, G. (author), Katan, J. (author), Xu, B. (author)
The aim of this research is to discover ways that multi-stakeholder platforms for collaboration can be instrumental in the efforts of the media industry to achieve compliance with strategic sustainability and enhance its practices of Corporate Social Responsibility. Industries have gained awareness of their responsibilities towards environmental...
conference paper 2010
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Xu, M. (author), Stefani, F. (author), Gerbeth, G. (author)
The conventional magnetic induction equation that governs hydromagnetic dynamo action is transformed to an equivalent integral equation system. An advantage of this approach is that the computational domain is restricted to the region occupied by the electrically conducting fluid and to its boundary. This integral equation approach is applied to...
conference paper 2006
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