A new methodology for learning design

This paper describes the development of a new methodology for learning design. Our approach is predicated on the view that no one, simple, view of design is appropriate, because of the inherently messy and creative nature of design. Instead we are adopting an interactive and multi-faceted approach which consists of a series of cycles of user consultation, focus groups and workshops alongside the development of learning design tools and resources. In particular we will describe how we have adapted an existing mind mapping and argumentation tool, Compendium, so that it can be used as a means of guiding designers through the learning design decision making process in the creation of learning activities. We will describe the initial evaluations of the use of this tool, along with our findings to date on a series of fact finding exercises to better understand individual and team approaches to design

Participation d'une flotte de véhicules électriques au réglage primaire de fréquence

Tirer profit de la disponibilité des véhicules électriques (VE) et les utiliser comme moyen de stockage diffus pour le réseau électrique est une solution pour diminuer le coût de cycle de vie élevé de ces derniers. La littérature présente le réglage de fréquence comme la solution la plus profitable pour les véhicules électriques. Ce papier propose une évaluation des gains économiques potentiels pour une flotte de véhicules électriques participant au réglage primaire, dans le cas Français. Dans un premier temps, le comportement d'une flotte de VE est modélisé. La participation de cette flotte au réglage primaire de fréquence est ensuite simulée. Deux stratégies de réglage, une avec échanges de puissance bidirectionnels entre les véhicules et le réseau, et une avec échanges unidirectionnels, sont comparées. Les résultats fournissent des indications sur la taille idéale de la flotte, et sur la caractérisation des échanges de puissance avec le réseau

Participation of an electric vehicle fleet to primary frequency control in France

International audienceUsing electric vehicles (EV) as distributed storage units could be a solution to take advantage of the good availability of EVs and reduce their total cost of ownership. The scientific literature features frequency control as one of the most profitable electric market for EV fleets. This paper presents an economic evaluation of the expected remuneration for a fleet of EVs participating to primary frequency control in France in 2020. First, the modelling of a French EV fleet is addressed. Simulations of the participation of this fleet to the French primary frequency control market are then performed. Two regulation strategies are considered: in the first one, only unidirectional power exchanges are allowed between EVs and the grid, while in the second one bidirectional exchanges are allowed. Results show that the expected remuneration is highly dependent on the ability to charge at work, the power level of the charging stations, and the bidirectional capabilities of the cars. Reference to this paper should be made as follows: Codani, P., Petit, M. and Perez, Y. (xxxx) 'Participation of an electric vehicle fleet to primary frequency control in France', Int

Bliesbruck – Steinfelder, parc archéologique de Bliesbruck-Reinheim

L’objet du programme de fouilles mis en place en 2016 a été d’identifier et de caractériser la fonction des bâtiments révélés par les prospections géophysiques et aériennes dans l’espace au sud des thermes de l’agglomération secondaire de Bliesbruck. La campagne 2016 a montré que les vestiges d’Époque romaine sont très mal conservés dans cette partie de l’agglomération en raison d’une forte érosion. Elle se caractérise par des conditions naturelles peu favorables qui ont nécessité en particul..

Thermal building model identification using time-scaled identification methods

International audienceThe aim of this paper is to propose a robust and accurate method for the parametric identification of the thermal behaviour of low consumption buildings. These buildings are known to have a two-time scale structure, which, if not handled properly, results in poor conditioning of the parametric identification. We compare three identification methods, one uses the data on the whole frequency domain (ARX) when the other methods use the same data but separated on local frequency domain (time scaled methods). All three methods identify a reduced second order model. Robustness is tested by corrupting the input and output before the identification, and comparing the simulation results for the various models and the original uncorrupted input. The numerical results clearly show that the time scaled methods are superior both in accuracy (noise free identification and simulation) and robustness (when identification is performed on corrupted data)

Search for passing-through-walls neutrons constrains hidden braneworlds

In many theoretical frameworks our visible world is a $3$-brane, embedded in a multidimensional bulk, possibly coexisting with hidden braneworlds. Some works have also shown that matter swapping between braneworlds can occur. Here we report the results of an experiment - at the Institut Laue-Langevin (Grenoble, France) - designed to detect thermal neutron swapping to and from another braneworld, thus constraining the probability $p^2$ of such an event. The limit, $p<4.6\times 10^{-10}$ at $95 \%$ C.L., is $4$ orders of magnitude better than the previous bound based on the disappearance of stored ultracold neutrons. In the simplest braneworld scenario, for two parallel Planck-scale branes separated by a distance $d$, we conclude that $d>87$ in Planck length units.Comment: 5 pages, 3 figures. Published in Physics Letters