1,806 research outputs found
Roma — Via Imperiale. Scavi e scoperte (1937- 1950) nella Construzione di via delle terme di Caracaüa e di via Cristoforo Colombo a cura di Lucia Avetta, 1985. (Titvli, 3)
No full textArnaud P. Roma — Via Imperiale. Scavi e scoperte (1937- 1950) nella Construzione di via delle terme di Caracaüa e di via Cristoforo Colombo a cura di Lucia Avetta, 1985. (Titvli, 3). In: Revue des Études Anciennes. Tome 90, 1988, n°3-4. pp. 467-468
Faire un stage de recherche à LAM. Entretien avec Arnaud Dupuy, stagiaire LAM
No full textFree consultation with a Doctor of mobile health team has Madagacar. Author : Docteur Ando. Licence : CC BY SA. https://commons.wikimedia.org/wiki/File:Free_consultation_with_a_Doctor_of_mobile_health_team_has_Madagacar.jpg En mai-juin 2019, Arnaud Dupuy a accompli un stage au laboratoire Les Afriques dans le monde, encadré par Jean-Philippe Berrou, enseignant-chercheur en économie. Il a été impliqué dans deux programmes de recherches pluridisciplinaires concernant l’aire africaine. Qu’est..
GPU-based high-precision orbital propagation of large sets of initial conditions through Picard–Chebyshev augmentation
No full textThe orbital propagation of large sets of initial conditions under high accuracy requirements is currently a bottleneck in the development of space missions, e.g. for planetary protection compliance analyses. The proposed approach can include any force source in the dynamical model through efficient Picard–Chebyshev (PC) numerical simulations. A two-level augmentation of the integration scheme is proposed, to run an arbitrary number of simulations within the same algorithm call, fully exploiting high performance and GPU (Graphics Processing Units) computing facilities. The performances obtained with implementation in C and NVIDIA® CUDA® programming languages are shown, on a test case taken from the optimization of a Solar Orbiter-like first resonant phase with Venus
Kustaanheimo–Stiefel - Cartesian orbital covariance transformation
No full textOrbital uncertainty propagation tasks have become the computational bottleneck in many astronomical and astrodynamical applications: Monte Carlo-based strategies lie at the state of the art, given the high non-linearity of the dynamics. For this reason, several methods to mitigate the computational intensity of such problems have been studied. On one side, alternative statistical approaches are being explored while relying on a fully non-linear description using Cartesian variables. At the same time, more computationally efficient formulations of the equations of motion have been proposed. This work focuses on a relatively unexplored preliminary step of the general uncertainty propagation problem, analyzing the transformation of the orbital uncertainty between different dynamical formulations, with the ultimate goal of enabling the use of more efficient models of the strongly non-linear gravitational interactions. In particular, the case of the covariance conversion between Cartesian and Kuustanheimo-Stiefel (KS) realms is studied, as it also poses the challenges of transformation between phase spaces of different dimensions and of the introduction of a fictitious time as independent dynamics' variable
Surfing Chaotic Perturbations in Interplanetary Multi-Flyby Trajectories: Augmented Picard-Chebyshev Integration for Parallel and GPU Computing Architectures
No full textThe computational intensity of the trajectory design problem severely affects the development time of any space mission, both in its preliminary phase and in the consequent optimization. This paper presents a formulation of the design problem that can account for any force source in the dynamical model through efficient Picard-Chebyshev numerical simulations. A two-level augmentation of the integration scheme is proposed, to run an arbitrary number of simulations within the same algorithm call, fully exploiting high performance and GPU computing facilities. The performances obtained with implementation in C and NVIDIA® CUDA® programming languages are shown, highlighting possible use cases and paradigms for the efficient use of GPU computing architectures
Dutch space; interview with Arnaud de Jong, CEO
No full textDutch Space, the largest space company in the Netherlands and part of Airbus Defence and Space, appointed a new CEO last year. The Leonardo Times sat down with the CEO Arnaud de Jong for an interview. We discuss his career, developments in Dutch Space, his take on competition in the commercial space domain and his future outlook on European and International space markets.Aerospace Engineerin
Arnaud François
No full textArnaud François, born in 1978, is a professor of philosophy at the University of Poitiers. He is the author of several books and articles on Bergson, Schopenhauer and Nietzsche, as well as of works on the philosophy of health. He is currently exploring, at the junction between philosophy and literature, the work of Émile Zola. He is, with Ondřej Švec, co-president of the Organisation Francophone pour la Formation et la Recherche Européennes en Sciences humaines (OFFRES), an academic collabora..
Jacobian Spheroids, Shallow Encounters, and the Keyhole Map
No full textThe study of the dynamics of flybys is featured in several space-mission-related applications, spanning from the design of interplanetary orbits to the computation of impact probabilities with given celestial bodies in planetary protection and defense tasks. While patched-conics, two-body models suffice in accuracy for trajectory planning cases, collision probability assessment requires instead more insightful approaches. High-fidelity simulations have shown impact patterns to happen outside nominally colliding trajectories in terms of two-body analysis, all caused by distant or weak interactions between the given trajectory-celestial body pairs. This work proposes a novel concept of sphere of influence based on the Jacobian of the three-body dynamics, resulting in a wider definition of encounters that encompasses weak interactions up to an arbitrary threshold. The so-defined Jacobian spheroids are then used to construct the Keyhole map, a graphical tool that maps in the orbital elements space both nominal and off-nominal keyholes, i.e., collision paths accounting for three-body weak interactions. The proposed concepts arise from and are compared against the on-ground casualty risk assessment of the European Space Agency’s mission JUICE
Interview with Arnaud Lechevalier on Social Europe
No full textHeike Wieters and Dominique Gareis of Saisir l'Europe - axis Social State have recently conducted an Interview with Arnaud Lechevalier (Maitre de Conferences, Université Paris 1 Panthéon-Sorbonne, researcher at the Laboratoire Interdisciplinaire pour la Sociologie Economique, CNAM-CNRS and at the Centre Marc Bloch, co-author (with Jan Wielgohs, Europa University Viadrina) of the edited volume Social Europe: A Dead End. What the Eurozone Crisis is doing to Europe’s Social Dimension, on social ..
Exploring Gesture-Based Tangible Interactions with a Lighting AI Agent
No full textThe paper explores a gestural and visual language to interact with an
Artificial Intelligent agent controlling connected lighting systems. Six interaction
modalities (four gestural and two visual) were designed and tested with
users in order to collect feedback on their intuitiveness, comfort and engagement
level. A comparison between traditional voice-based interaction modalities with
AI and the proposed gesture-based language was performed. Preliminary results
are discussed, including the importance of cognitive metaphors in gesture-based
interaction, the relation between intuitiveness, innovation, and engagement, and
the advantages provided by gesture-based interactions in terms of privacy,
subtleness, and pleasantness, versus the limited options and the need to learn a
codified language. Insights will help designers in the development of seamless
interactions with AI agents for ambient intelligent systems
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