Time filter

Source Type

Fontainebleau, France

MINES ParisTech , also known as École des Mines de Paris, ENSMP, Mines Paris or simply les Mines), created in 1783 by King Louis XVI, is one of the most prominent French engineering schools and a prestigious member of ParisTech and PSL* .Mines ParisTech is reputed for the outstanding performance of its research centers, its very high selectivity and the quality of its international partnerships with prestigious universities, which include Massachusetts Institute of Technology , California Institute of Technology , Shanghai Jiao Tong University, University of Hong Kong, National University of Singapore , Novosibirsk State University, Pontifical Catholic University of Chile and Tokyo Tech.Despite its small size , it is a crucial part of the infrastructure of French industry. Wikipedia.

Rouchon P.,MINES ParisTech
IEEE Transactions on Automatic Control | Year: 2011

Fidelity is known to increase through any Kraus map: the fidelity between two density matrices is less than the fidelity between their images via a Kraus map. We prove here that, in average, fidelity is also increasing for discrete-time quantum filters attached to an arbitrary Kraus map: fidelity between the density matrix of the underlying Markov chain and the density matrix of the associated quantum filter is a sub-martingale. This result is not restricted to pure states. It also holds true for mixed states. © 2011 IEEE.

Coupez T.,MINES ParisTech
Journal of Computational Physics | Year: 2011

Metric tensors play a key role to control the generation of unstructured anisotropic meshes. In practice, the most well established error analysis enables to calculate a metric tensor on an element basis. In this paper, we propose to build a metric field directly at the nodes of the mesh for a direct use in the meshing tools. First, the unit mesh metric is defined and well justified on a node basis, by using the statistical concept of length distribution tensors. Then, the interpolation error analysis is performed on the projected approximate scalar field along the edges. The error estimate is established on each edge whatever the dimension is. It enables to calculate a stretching factor providing a new edge length distribution, its associated tensor and the corresponding metric. The optimal stretching factor field is obtained by solving an optimization problem under the constraint of a fixed number of edges in the mesh. Several examples of interpolation error are proposed as well as preliminary results of anisotropic adaptation for interface and free surface problem using a level set method. © 2010 Elsevier Inc.

Wybo J.-L.,MINES ParisTech
Renewable and Sustainable Energy Reviews | Year: 2013

The development of large-scale Photovoltaic energy-production systems is one of the promising solutions to replace fuel-based and nuclear-based electricity plants. Compared to most sources of electricity, photovoltaic panels produce few CO2 in operation (although their manufacturing, transport, installation, cleaning and decommissioning/recycling creates CO 2 emissions), they need little maintenance, last 20 years or more and can be recycled. One of the key questions raised in developing large-scale PV systems is to find appropriate locations: flat, secured against vandalism and thieves, and near to existing power lines. Airports areas fit quite well those constraints so an increasing number of airport authorities is installing or planning to install large surfaces of PV panels producing 20 MW or more. In this paper, we address the safety concerns related to the implementation of large-scale PV systems in airport locations. We identify different kinds of risky situations in which PV panels are implied and we analyze their causes and potential consequences, along with proposals for risk reduction. © 2013 Elsevier Ltd. All rights reserved.

Sanfelice R.G.,University of Arizona | Praly L.,MINES ParisTech
Automatica | Year: 2011

We address the problem of state observation for a system whose dynamics may involve poorly known, perhaps even nonlocally Lipschitz functions and whose output measurement may be corrupted by noise. It is known that one way to cope with all these uncertainties and noise is to use a high-gain observer with a gain adapted on-line. The proposed method, while presented for a particular case, relies on a "generic" analysis tool based on the study of differential inequalities involving quadratic functions of the error system in two coordinate frames plus the gain adaptation law. We establish that, for bounded system solutions, the estimated state and the gain are bounded. Moreover, we provide an upper bound for the mean value of the error signals as a function of the observer parameters. Since due to perturbations the gain adaptation law may drive the observer/plant interconnection to nearby boundary of its stability region, oscillatory behavior may emerge. To overcome this issue, we suggest an adaptive procedure based on a space averaging technique involving several copies of the observer. © 2011 Elsevier Ltd. All rights reserved.

Agency: Cordis | Branch: H2020 | Program: MSCA-IF-EF-ST | Phase: MSCA-IF-2015-EF | Award Amount: 173.08K | Year: 2016

The microstructure evolution of metallic alloys undergoing thermomechanical loads involves strain hardening, dynamic recovery, recrystallisation and grain growth. Predicting such phenomena is crucial for the control and optimisation of the mechanical properties of final components. Phase field approaches are used to simulate the change in grain morphology, growth and coalescence induced by grain boundary and stored energies due to prior viscoplastic deformation. On the other hand, continuum crystal viscoplasticity theory is well-established for finite element simulations of the deformation of polycrystalline aggregates. Currently, phase field and crystal plasticity models are used separately or successively: the field of stored elastoplastic energy computed from the crystal plasticity model serves as the initial energy distribution in the phase field simulation of subsequent grain morphology evolution. The objective of the project is to strongly couple both approaches so as to simulate dynamic grain morphology evolution during deformation processes. Each theory, i.e. the phase field model and the continuum crystal plasticity approach, possesses an evolution equation for the crystal lattice orientation. An essential driving force for lattice rotation evolution is the orientation gradient, the lattice curvature, which is the primary constitutive variable of the Cosserat continuum theory. The Cosserat theory offers a unique way of reconciling both approaches. The results of finite element simulations based on this new theory will be compared to experimental results, namely lattice orientation maps and strain field measurements, available for aluminium and copper polycrystals. The proposed model is the missing link between the physical description of grain boundary motion and macroscopic recrystallisation models. Such a paradigm has not yet been proposed and will open new ways for the understanding of elementary recrystallisation mechanisms in polycrystals.

Discover hidden collaborations