Heavy-flavour and quarkonium measurements in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with ALICE

International audienceWe report on the latest results on heavy-flavour and J/ production at both midrapidity and forward rapidity, in Pb-Pb collisions at sqrt (sNN) = 2.76 TeV, measured with the ALICE experiment at the LHC. We present measurements of the nuclear modification factor for open heavy-flavours and J/psi and compare these results to model predictions. Preliminary results on the elliptic flow of D mesons and J/psi are discussed

In memory of Roman Sławiński

Publikacja recenzowana / Peer-reviewed publicatio

Modelling of precipitation during friction stir welding of an Al-Mg-Si alloy

In this study, microstructural evolution in AA 6082-T651 friction stir welds is simulated using a metallurgical model coupling a Monte Carlo random sampling technique and classical nucleation and growth theory. The calculated volume fraction and size distribution of precipitates are used to predict hardness. Some of the model parameters are calibrated from microstructure and hardness data available in the open literature. Temperature and hardness data in the region of the weld are obtained from FSW experiments. The temperature in the weld is predicted by finite element analysis, with a simplified thermo-mechanical approach, after calibration of heat transfer parameters in order to match the temperature measurements. The calculated thermal cycles are then applied to the metallurgical model. The subsequently predicted hardness profiles across the weld are then compared with experimental data

Xiaohong Xiao-Planes, Éducation et politique en Chine : le rôle des élites du Jiangsu, 1905-1914 (Education and Politics in China—The Role of the Jiangsu Elite, 1905-1914)

Over the last thirty years, many works, both Chinese and foreign, have been devoted to the reformist activities of notables from various Chinese provinces during the last half-century of the Qing dynasty, particularly during the period 1901-12. These books have also covered the different forms of associations that these elite organised themselves into in order to increase the efficiency of their actions and their ability to negotiate with the imperial administration. In the general hubbub of ..

Communautés scientifiques et politiques de la science dans la Chine d’aujourd’hui

Marianne Bastid-Bruguière, directeur de recherche au CNRS L’introduction bibliographique générale sur l’histoire contempo- raine de la Chine a présenté aux étudiants les instruments documentaires classiques et les ressources informatiques nouvelles disponibles en ce domaine. L’enseignement a porté d’abord sur la mise en œuvre du programme nucléaire chinois, dont l’analyse avait été engagée l’an dernier, fondée sur les publications récentes de biographies et de mémoires de ses principaux artis..

D meson nuclear modification factors in Pb-Pb collisions at {\surd}sNN = 2.76 TeV, measured with the ALICE detector

The ALICE experiment has measured the D meson production in pp and Pb-Pb collisions at the LHC at {\surd}s = 7 and 2.76 TeV and {\surd}sNN = 2.76 TeV respectively, via the exclusive reconstruction of hadronic decay channels. The analyses of the D0{\to}K-pi+ and D+{\to}K-pi+pi+ channels will be described and the preliminary results for the D0 and D+ nuclear modification factor will be presented.Comment: Proceedings of Quark Matter 2011 conference. 4 pages, 4 figures. The slides of the talk can be found at the link: http://indico.cern.ch/materialDisplay.py?contribId=591&sessionId=53&materialId=slides&confId=3024

Asymmetric Colliding Nuclear Matter Approach in Heavy Ion Collisions

The early stage of a heavy ion collision is governed by local non-equilibrium momentum distributions which have been approximated by colliding nuclear matter configurations, i.e. by two Lorentz elongated Fermi ellipsoids. This approach has been extended from the previous assumption of symmetric systems to asymmetric 2-Fermi sphere configurations, i.e. to different densities. This provides a smoother transition from the limiting situation of two interpenetrating currents to an equilibrated system. The model is applied to the dynamical situations of heavy ion collisions at intermediate energies within the framework of relativistic transport (RBUU) calculations. We find that the extended colliding nuclear matter approach is more appropriate to describe collective reaction dynamics in terms of flow observables, in particular, for the elliptic flow at low energies.Comment: 21 pages, 8 figures, accepted for publication in Nuclear Physics

Heavy-flavour production in Pb-Pb collisions at the LHC, measured with the ALICE detector

We present the first results from the ALICE experiment on the nuclear modification factors for heavy-flavour hadron production in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV. Using proton-proton and lead-lead collision samples at sqrt{s}=7 TeV and sqrt{s_NN}=2.76 TeV, respectively, nuclear modification factors R_AA(pt) were measured for D mesons at central rapidity (via displaced decay vertex reconstruction), and for electrons and muons, at central and forward rapidity, respectively.Comment: 8 pages, 5 figures, plenary talk at Quark Matter 2011, Annecy, Franc