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Carrado A.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Pelletier H.,Laboratoire Of Genie Of La Conception Lgeco | Faerber J.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Versini G.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Mihailescu I.N.,National Institute for Lasers
Materials Science Forum

We report results on Pulsed Laser Deposition (PLD) of ceramic thin films for biomedical applications. The coating of metallic implants with bioceramic thin films (e.g. calcium phosphates, in particular hydroxyapatite) has been proposed as a solution for combining the mechanical properties of the metallic material with the bioactive character of the ceramic layer, leading to a better integration of the entire implant with the newly remodelled bone. Other bioceramics (as e.g. alumina) exhibit a high degree of chemical inertness under physiological conditions, excellent wear resistance, ability to be polished to a high surface finish and excellent hardness as coating. Among the different methods to obtain ceramic coatings that have been widely used so far, PLD was focusing interest due to its versatility and controllability, the aptitude to synthesize and deposit uniform films, with an accurate control of the stoichiometry and crystallinity. We investigated the micro-structural and mechanical characteristics of PLD bioceramic coatings on metal substrate. Various microscopic observations and mechanical characterisations by nanoindentation and scratch tests were used in order to connect the mechanical response to the microstructure of the coatings. Our studies revealed that the pulsed-laser deposition technique appears to be a competitive candidate in biomedical applications as an extremely versatile technology. © (2010) Trans Tech Publications. Source

Risser M.,National Institute for Applied Sciences, Strasbourg | Risser M.,Laboratoire Of Genie Of La Conception Lgeco | Vasile C.,National Institute for Applied Sciences, Strasbourg | Vasile C.,Laboratoire Of Genie Of La Conception Lgeco | And 5 more authors.
International Journal of Refrigeration

This paper presents a numerical model conceived for a multi-physics evaluation of a magnetic refrigeration system. The model takes into account the variable magnetic field, the characteristics of the magnetocaloric materials (MCM) as well as the efficiency of the fluid flow heat transfer between the hot and the cold sources via the MCM. This model allows us to optimize these elements and to determine their impact on the overall performance of a magnetocaloric device. We present here a finite-difference model of AMRR cycles for a sub-unit of MCM crossed by micro-channels of fluid connected to cold and hot regenerative receivers. Thus, the calculation of the output parameters such as the temperature span, and thermal power passing from the cold receiver to the hot receiver has been performed. The influence of the geometry of the MCM and the fluid flow were investigated over the working domain highlighting the current technological achievements and indicating possible improvements. © 2010 Elsevier Ltd and IIR. All rights reserved. Source

Ho X.N.,Laboratoire Of Genie Of La Conception Lgeco | Nowamooz H.,Laboratoire Of Genie Of La Conception Lgeco | Chazallon C.,Laboratoire Of Genie Of La Conception Lgeco | Migault B.,Laboratoire Of Genie Of La Conception Lgeco
Springer Series in Geomechanics and Geoengineering

This paper presents the influence of the unsaturated state (suction) and especially the different hydraulic behaviour during the wetting and drying cycles (hysteresis phenomenon) on the resilient behavior, of unbound granular materials for roads. First, the Soil Water Retention Curve (SWRC) of a compacted clayey sand will be obtained for both wetting and drying paths. These experimental results were then completed by a series of repeated load triaxial tests at a range of water content between 8% and 11% on both wetting and drying paths. Finally, the experimental results were simulated using the modified Boyce model. Generally, it can be stated that the hydraulic hysteresis phenomenon plays an important role on the mechanical modelling of the resilient behaviour. © Springer-Verlag Berlin Heidelberg 2013. Source

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