Distribution of the number of particles in the final state of hadron-nucleus collisions

Recently, Liou, Mueller and Munier have argued that proton-nucleus collisions at the LHC may give access to the full statistics of the event-by-event fluctuations of the gluon density in the proton. Indeed, the number of particles produced in an event in rapidity slices in the fragmentation region of the proton may, under some well-defined assumptions, be directly related to the number of gluons which have a transverse momentum larger than the nuclear saturation scale present in the proton at the time of the interaction with the nucleus. A first calculation of the probability distribution of the number of gluons in a hadron was performed, using the color dipole model. In this talk, we review this proposal, and present preliminary numerical calculations which support the analytical results obtained so far.Comment: 6 pages, 2 figures. Talk presented at DIS 201

Proposals for the Reborn Pharo Developer

International audienceSmalltalk was at the birth of current IDEs. Current Smalltalk IDEs, however, lost their abilities to adapt to developer needs (edit and jump, back button, auto-completion,...). Therefore while offering a powerful sets of tools current Smalltalk IDEs looks clunky and often lacks the application of a consistent set of guidelines. In this paper we sketch some possible IDEs future features or reorganization

Cycles Assessment with CycleTable

Understanding the package organization of a large application is a challenging and critical task since it allows developers to better maintain the application. Several ap- proaches show in different ways software structure. Fewer show modularity issues at the package level. We focus on modularity issues due to cyclic dependencies between packages. Most approaches detect Strongly Connected Components (SCC) in a graph of dependencies. However, SCC detection does not allow one to easily understand and remove cyclic dependencies in legacy software displaying dozens of packages all dependent on each other. This paper presents i) a heuristic to focus on shared dependencies between cycles in SCC and ii) CycleTable, a visualization showing interesting dependencies to efficiently remove cycles in the system. This visualization is completed with enriched cells, small views displaying the internals of a dependency [LDDB09]. We performed i) a case study which shows that the shared dependency heuristic highlights dependencies to be removed, and ii) a comparative study which shows that CycleTable is useful for the task of breaking cycles in a SCC compared to a normal node-link representation

Visualisations pour la remodularisation à large échelle des systèmes à objets

National audienceDans ce chapitre, nous abordons deux points critiques de la remodularisa- tion : comment visualiser la structure d'un logiciel pour aider à la rendre mod- ulaire et comment aider le développeur à prendre les bonnes décisions. D'abord nous décrivons certains outils pour visualiser la structure des logiciels et comment nous les adaptons à la remodularisation. Ensuite nous présentons des visualisations adaptées à l'identification des problèmes de modularité. Enfin, nous proposons un outil, nommé Orion, permettant de simuler les changements de structure d'un logi- ciel. Il permet d'analyser l'impact des changements dans la structure et d'évaluer les coûts associés

Dispersive wave emission and supercontinuum generation in a silicon wire waveguide pumped around the 1550 nm telecommunication wavelength

We experimentally and numerically study dispersive wave emission, soliton fission and supercontinuum generation in a silicon wire at telecommunication wavelengths. Through dispersion engineering, we experimentally confirm a previously reported numerical study [1] and show that the emission of resonant radiation from the solitons can lead to the generation of a supercontinuum spanning over 500 nm. An excellent agreement with numerical simulations is observed.Comment: 4 pages, 4 figure

Unexpected pathways toward college graduation

This study examines the dispositions and experiences of support of college students associated with unexpected pathways toward college graduation. The final sample was drawn from a national sample of 3,998 youths who participated in a longitudinal project. Using the k-nearest neighbors’ algorithm, we created four groups based on the Québec High School Average and the College Graduation status four years after admission (Unexpected Graduates; Expected Dropouts; Unexpected Dropouts; Expected Graduates). Compared to ED, UG showed lower aggressive behaviors and attentional problems and higher participation in institutional or targeted support measures in college. They were also more likely to have attended a private high school. Compared to EG, UD showed lower academic behaviors and motivation, lower perceptions of teaching quality and support, and lower economic capital and support from family. They were also more likely to enrol in a technical college program and less likely to have attended a private high school