Small Scale Structure Formation in Chameleon Cosmology

Chameleon fields are scalar fields whose mass depends on the ambient matter density. We investigate the effects of these fields on the growth of density perturbations on sub-galactic scales and the formation of the first dark matter halos. Density perturbations on comoving scales $R < 1 {\rm pc}$ go non--linear and collapse to form structure much earlier than in standard $\Lambda$CDM cosmology. The resulting mini-halos are hence more dense and resilient to disruption. We therefore expect (provided that the density perturbations on these scales have not been erased by damping processes) that the dark matter distribution on small scales would be more clumpy in chameleon cosmology than in the $\Lambda$CDM model.Comment: 13 pages, 4 figure

C4R D 22.1 Novel Rail Freight Vehicles (intermediate)

WP22 is aiming to propose solutions to enhance the efficiency of Rail Freight transport. At the beginning a large forwarder operating long distance combined trains across Europe and a Car carrier operating a fleet of more than 3500 wagons involved in multimodal logistics across Europe and being also an ECM for other wagon operators have expressed their most urgent needs to increase their efficiency by reducing their operating costs while improving the quality of service. The tools that this work package wanted to develop was to increase the usable length of a standard train with new wagon designs having a lower LCC. At the same time improving the asset rotation with synchronous braking of all wagons could have reduced the wear and tear of the new composite brake blocks aiming at reducing noise. Several designs have been studied for car carrier wagons reaching 5 bodies with 6 axels for an overall length of around 62m. For container traffics two ideas have been studied. The first one was to introduce in a standard train composed of wagons capable to carry 40’ containers or 40’ plus 20’ containers a partial flexibility to transport a third container type of 45’ without lengthening the trains and with minimal changes on the wagons. The second idea studied was a new design of a 5 bodies wagon with 6 bogies for an overall length of around 72m. This solution was aiming to reduce the number of bogies and hence the maintenance cost. A third idea was to develop the same concept for transport of crane-able semitrailers with a 4 bodies wagon with 6 bogies for an overall length of around 67M. Each of these solutions were studied successfully in term of stability with the mathematical programs of KTH. The cost of these new designs were estimated by NTnetAB and the operational efficiencies calculated when possible or estimated according to expert experience. The impact in terms of temperature reduction with synchronous braking showed a significant decrease on the test benches of Knorr Bremse. Unfortunately new braking methodologies by applying successively strong braking followed by a release have reduced the temperature reached by the blocks and the wheel treads in a zone where the impact of the synchronous braking would not bring significant maintenance cost reduction and damage reduction. For the new wagon designs the cost benefit analysis show interesting progress for the car carrier wagon and the container wagon but not for the pocket wagons. The flexibility of putting a third of the number of container with a length of 45’ without lengthening the train may be very promising. Finally an extremely promising field is to significantly reduce the preparation time before the departure of the train with the introduction of an EOT (End of Train) device. This intermediate deliverable will be completed in the next issue with the introduction of these new designs on the Network and with a possible roadmap to mobilize investors to create these new wagons.Capacity4Rai

DÉTECTION DES LAITS RECONSTITUÉS ET CHOIX D'UN RÉVÉLATEUR

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C4R D 2.2.2 Novel Rail Freight Vehicles (Final)

Rapporten ger förslag på innovationer gällande utveckling av godsvagnar för ökad kapacitet och flexibilitet syftande till ökad konkurrenskraft för godstrafik på järnväg.Capacity4Rai

Small random perturbation of a classical mean field model

AbstractThe thermodynamic limit of a classical mean field system perturbed by a small Sherrington–Kirkpatrick term is derived. It is proved to exhibit behaviors that may strongly differ from the usual ones. Examples are given showing that every situation is likely to occur. The main tools that are used are large deviation techniques and conditioning

AU SUJET DU VIRAGE DE LA RESAZURINE DANS LES LAITS FRAIS ADDITIONNÉS DE LAIT RECONSTITUÉ

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Constitution assistée d'un parcours de formation s'appuyant sur les outils du web sémantique et l'analyse de corpus

National audienceDans cette recherche nous voulons structurer différentes tech- niques intégrées dans le domaine des Humanités Numériques. Notre but est d’obtenir des connaissances expertes à partir de corpus de textes ou d’entretien. Pour cela, nous ferons appel à des outils de traitement automatique du langage naturel pour alimenter un réseau lexical en français. Des techniques de l’intelligence artificielle seront appliquées. Ainsi nous construirons des modèles pour décrire les connaissances didactiques d’une discipline donnée et les parcours d’apprentissages associés à une typologie d’apprenants. Un outil graphique sera proposé à l’enseignant ou à l’apprenant pour faciliter la construction de ces parcours