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Publications associées (12)

Critical thickness of GaN on AlN: impact of growth temperature and dislocation density

Nicolas Grandjean, Pirouz Sohi, Denis Martin

Critical thickness and strain relaxation of c-plane GaN layers grown by molecular beam epitaxy on AlN were studied as a function of growth temperature and threading dislocation density (TDD). For this purpose we used AlN/sapphire templates and AlN single c ...

2017

Climbing favours the tripod gait over alternative faster insect gaits

Dario Floreano, Auke Ijspeert, Thibault Lucien Christian Asselborn, Pavan P Ramdya, Robin Thandiackal

To escape danger or catch prey, running vertebrates rely on dynamic gaits with minimal ground contact. By contrast, most insects use a tripod gait that maintains at least three legs on the ground at any given time. One prevailing hypothesis for this differ ...

2017

The European Integrated Tokamak Modelling (ITM) effort: achievements and first physics results

Olivier Sauter, Antonio José Pereira de Figueiredo, Emanuele Poli

A selection of achievements and first physics results are presented of the European Integrated Tokamak Modelling Task Force (EFDA ITM-TF) simulation framework, which aims to provide a standardized platform and an integrated modelling suite of validated num ...

Iop Publishing Ltd2014

In situ copper–alumina composites

Andreas Mortensen, Carmen Krüger

We present a process for the production of Cu-Al matrix composites containing between 25 and 30 vol.% in situ Al2O3. The composites are prepared by pressing, heat-treating and hot working blended powders of Cu, Al and CuO packed into copper alloy cans. The ...

Elsevier2013

Multiphase mixed-integer optimal control framework for aircraft conflict avoidance

Maryam Kamgarpour

This paper formulates the problem of aircraft conflict avoidance as a multiphase mixed-integer optimal control problem. In order to find optimal maneuvers, accurate models of aircraft nonlinear dynamics and flight envelop constraints are used. Wind forecas ...

2012

Comparison and combination of reduced order modelling techniques in 3D parametrized heat transfer problems

Gianluigi Rozza, Fabrizio Gelsomino

Reduced Basis (RB) method has successfully been used in 2D to solve heat transfer parametrized problems. In this work, we present some 3D applications in the same field. We consider two problems, the steady Thermal Fin and the time dependent Graetz Flow, w ...

Taylor & Francis2011

Thermal soaring flight of birds and unmanned aerial vehicles

Severin Leven

Thermal soaring saves much energy, but flying large distances in this form represents a great challenge for birds, people and unmanned aerial vehicles (UAVs). The solution is to make use of the so-called thermals, which are localized, warmer regions in the ...

2010

Towards a self-deploying and gliding robot

Dario Floreano, Mirko Kovac, Jean-Christophe Zufferey

Strategies for hybrid locomotion such as jumping and gliding are used in nature by many different animals for traveling over rough terrain. This combination of locomotion modes also allows small robots to overcome relatively large obstacles at a minimal en ...

Springer Berlin Heidelberg2009

Real-Time Reliable Simulation of Heat Transfer Phenomena

Gianluigi Rozza

In this paper we discuss the application of the certified reduced basis method and the associated software package rbMIT (c) to ``worked problems'' in steady and unsteady conduction. Each worked problem is characterized by an input parameter vector --- mat ...

ASME2009

A scalable and oblivious atomicity assertion

Rachid Guerraoui, Marko Vukolic

This paper presents SOAR: the first oblivious atomicity assertion with polynomial complexity. SOAR enables to check atomicity of a single-writer multi-reader register implementation. The basic idea underlying the low overhead induced by SOAR lies in greedi ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2008

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