Integration of recrystallisation model coupled with an elasto-visco-plastic law - Experimental tests and calibration of this model

in Proceedings of the 2nd ESAFORM Conference on Material Forming (1999)

The recrystallisation model is based on the model developed by Kopp [1,2]. This model is implemented in our finite element code "lagamine" and is coupled with a thermomechanical elasto-visco-plastic law ... [more ▼]

The recrystallisation model is based on the model developed by Kopp [1,2]. This model is implemented in our finite element code "lagamine" and is coupled with a thermomechanical elasto-visco-plastic law. It assumes that each integration point in the mesh is represented by a number of sub-structures with a different volumic recrystallised fraction. In order to be able to calibrate such a model, we need to perform a lot of experimentals tests. Hot compression tests on small cylinder at different temperatures and strain rates are made till strain level from 0.1 up to 0.7. The compressed cylinders are quenched after the tests. A metallographic study of the quenched cylinders gives the recrystallised fraction function of the strain, the strain rate and temperature. So experimental, numerical and metallographic studies of hot compression tests aim the definition of an accurate predictive thermo-mechanic metallurgical model able to stimulate forging processes. [less ▲]

Integration of vehicle, propulsion system and separation unit designs for a launcher using in-flight oxygen collection

in AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference (2005, May)

The use of in-flight Oxygen Collection has shown to significantly improve space launcher performance. The conceptual approach followed by the Royal Military Academy of Brussels (RMA) has tried to widen ... [more ▼]

The use of in-flight Oxygen Collection has shown to significantly improve space launcher performance. The conceptual approach followed by the Royal Military Academy of Brussels (RMA) has tried to widen the available design margins in order to reduce the required technological leap and limit the economical risk associated with such a development. The aim of the ESA-funded theoretical and experimental study on an air separation device is to demonstrate the possibility of performing efficient air distillation in a compact rotating column. An integration of the vehicle, propulsion system and separation unit designs is presented aiming to optimise the overall vehicle performance while keeping technological difficulty and system complexity at a reasonable level. Reference vehicles are presented in their specific mission profiles with an emphasis on TSTO’s. Different layouts of the internal energy and mass flowsheets are compared, in order to make best use of the refrigeration capacity of the hydrogen fuel running though the propulsion system during the first phase of the flight considering the separator as a classical distillation column. This analysis provides the requirements in terms of heat exchange capacity, compression ratios and number of so-called transfer units needed in the separator. Here, the system is intentionally kept simple, to limit complexity, but the analysis is thorough and accurate, including, for example, the effect of the presence of argon. An analysis of the separation unit to reach those requirements is proposed. That includes internals, practical building with estimates of pressure drop, separation performance and flow limitation. Analysis of size reduction of the distillation unit from usual 1-g column to the high-g unit is provided as well as the scale up methodology of laboratory results. First experimental results obtained with our centrifugally enhanced distillation separation system are presented and perspectives for a larger on-board operational unit proposed. [less ▲]

L'intégration par les jeunes des stéréotypes sexistes véhiculés par les médias

Report (2007)

Le rapport analyse la manière dont les stéréotypes sexistes sont diffusés dans les médias, notamment par les situations et par l'image. Il présente également une enquête sur les jeunes pour percevoir la ... [more ▼]

Le rapport analyse la manière dont les stéréotypes sexistes sont diffusés dans les médias, notamment par les situations et par l'image. Il présente également une enquête sur les jeunes pour percevoir la façon dont ces stéréotypes sont intégrés ou mis en distance en fonction des pratiques de consommation médiatique mais aussi du contexte. [less ▲]

Intégration régionale et démocratie. Quelques réflexions à partir de la pensée d'Alexis de Tocqueville

in Revue Burkinabè du droit (2001), (39-40), 9-20

L'intégration sociale des immigrés en Espagne

Conference (2009)

Integration und Interaktion: Möglichkeiten des Einsatzes von Notebooks und Internet in der regelungstechnischen Lehre

in Automatisierungstechnik (2004), vol.52, no.2

Since a few years high-schools are testing the use of notebooks for teaching purposes and already use them quite successfully. A new approach is to use them also for academic education. In the first part ... [more ▼]

Since a few years high-schools are testing the use of notebooks for teaching purposes and already use them quite successfully. A new approach is to use them also for academic education. In the first part of this article an overview will be given about the concepts of the BMBF-sponsored project Notebook University. The second part describes how notebooks are used in the e-learning project to support the teaching of control theory [less ▲]

Integration/blending of external information into genetic/genomic evaluations

Diverse speeche and writing (2012)

Integrator forwarding : a new recursive nonlinear robust design

in Automatica (1997), 33(5), 979-984

We consider the global stabilization of nonlinear systems in strict feedforward form. We show that these systems, while not feedback linearizable, can be (globally) transformed by feedback and ... [more ▼]

We consider the global stabilization of nonlinear systems in strict feedforward form. We show that these systems, while not feedback linearizable, can be (globally) transformed by feedback and diffeomorphism into a lower-triangular form. The transformation is explicit and recursive. We employ this transformation to design a globally stabilizing controller with optimality properties and an input-to-state stability property with respect to matched uncertainties. [less ▲]

Intégrer de préoccupations de promotion de la santé dans les politiques locales, est-ce possible ?

in Education Santé (2004), 186

Intégrer les représentations spatiales dans la pratique pédagogique : considérations méthodologiques et applications

in André, Yves; Bailly, Antoine; Ferras, Robert (Eds.) et al Représenter l'espace. L'imaginaire à l'école (1989)

Considérations méthodologiques et exemples en vue d'intégrer les représentations dans les prtaiques de cours