Interacting particle systems and Yaglom limit approximation of diffusions with unbounded drift

We study the existence and the exponential ergodicity of a general interacting particle system, whose components are driven by independent diffusion processes with values in an open subset of \mathds{R}^d, $d\geq 1$. The interaction occurs when a particle hits the boundary: it jumps to a position chosen with respect to a probability measure depending on the position of the whole system. Then we study the behavior of such a system when the number of particles goes to infinity. This leads us to an approximation method for the Yaglom limit of multi-dimensional diffusion processes with unbounded drift defined on an unbounded open set. While most of known results on such limits are obtained by spectral theory arguments and are concerned with existence and uniqueness problems, our approximation method allows us to get numerical values of quasi-stationary distributions, which find applications to many disciplines. We end the paper with numerical illustrations of our approximation method for stochastic processes related to biological population models

Monitoring response to hepatitis B and C in EU/EEA: testing policies, availability of data on care cascade and chronic viral hepatitis-related mortality – results from two surveys (2016)

Objectives: The World Health Organization (WHO) developed a European Regional Action Plan (EAP) to fast-track action towards the goal of eliminating viral hepatitis. Robust monitoring is essential to assess national programme performance. The purpose of this study was to assess the availability of selected monitoring data sources in European Union/European Economic Area (EU/EEA) Member States (MS). Methods: Availability of data sources at EU/EEA level was assessed using two surveys distributed to 31 EU/EEA MS in 2016. The two surveys covered (A) availability of policy documents on testing; testing practices and monitoring; monitoring of diagnosis and treatment initiation, and; (B) availability of data on mortality attributable to chronic viral hepatitis. Results: Just over two-thirds of EU/EEA MS responded to the surveys. 86% (18/21) reported national testing guidance covering HBV, and 81% (17/21) covering HCV; while 33% (7/21) and 38% (8/21) of countries, respectively, monitored the number of tests performed. 71% (15/21) of countries monitored the number of chronic HBV cases diagnosed and 33% (7/21) the number of people treated. Corresponding figures for HCV were 48% (10/21) and 57% (12/21). 27% (6/22) of countries reported availability of data on mortality attributable to chronic viral hepatitis. Conclusions: The results of this study suggest that sources of information in EU/EEA Member States to monitor the progress towards the EAP milestones and targets related to viral hepatitis diagnosis, cascade of care and attributable mortality are limited. Our analysis should raise awareness among EU/EEA policy makers and stimulate higher prioritisation of efforts to improve the monitoring of national viral hepatitis programmes

Numerical Study of Finite Size Scaling for First Order Phase Transitions

I present results of simulations of the q=10 and q=20 2-d Potts models in the transition region. The asymptotic finite size behavior sets in only for extremely large lattices. We learn from this simulation that finite size scaling cannot be used to decide that a transition is first order.Comment: Talk presented at the Workshop on Dynamics of First Order Transitions, HLRZ, Forschungszentrum J\"ulich,Germany, June 1-3, 1992, 7 pages, 2 PostScript Figures (typing mistakes in figure captions corrected

Homotopy exponents for large H-spaces

We show that H-spaces with finitely generated cohomology, as an algebra or as an algebra over the Steenrod algebra, have homotopy exponents at all primes. This provides a positive answer to a question of Stanley.Comment: 4 page

From positive youth development to youth’s engagement : the dream teens

In addition to the empirical validation of ‘health and happiness’ determinants, theoretical models suggesting where to ground actions are necessary. In the beginning of the twentieth century, intervention models focused on evaluation and empirical validation were only concerned about overt behaviours (verbal and non-verbal) and covert behaviours (cognitions and emotions). Later on in the middle of the century, there was a shift from treating the problems to a positive approach, focused on promoting assets and individual strengths. Thus, the role of social competences, self-regulation and resilience became salient. Researchers also highlighted the importance of social cohesion and social support, as active health and wellbeing facilitators. More recently, in the twentyfirst century, the population’s engagement (positive engagement) has become crucial. This paper presents the evolution of this theoretical and scientific path, using Portugal as a case study, where early interventions focused on the positive aspects of both covert and overt behaviours, while more recent interventions included explicitly the perspective of youth engagement and participation, as is the case of the Dream Teens Project. It is expected that the political and professional understanding of this trajectory will allow professionals to provide better health and educational services, improving young people’s engagement, quality of life, health and wellbeingpeer-reviewe

Pure braid subgroups of braided Thompson's groups

We describe pure braided versions of Thompson's group F. These groups, $BF$ and $\hat{BF}$, are subgroups of the braided versions of Thompson's group V, introduced by Brin and Dehornoy. Unlike V, elements of F are order-preserving self-maps of the interval and we use pure braids together with elements of F thus preserving order. We define these groups and give normal forms for elements and describe infinite and finite presentations of these groups.Comment: 26 pages, 6 figures, with updated bibliograph

La Cultura mediterránea en los Juegos Olímpicos de Barcelona'92

En este artículo publicado en la revista INCOM, se describe y analiza la presencia de elementos mediterráneos en las ceremonias de los Juegos Olímpicos de Barcelona'92.Dans cet article publié dans la revue INCOM, il est décrit et analyse la présence d'éléments méditerranéens dans les cérémonies des Jeux Olympiques de Barcelona'92

Localization of algebras over coloured operads

We give sufficient conditions for homotopical localization functors to preserve algebras over coloured operads in monoidal model categories. Our approach encompasses a number of previous results about preservation of structures under localizations, such as loop spaces or infinite loop spaces, and provides new results of the same kind. For instance, under suitable assumptions, homotopical localizations preserve ring spectra (in the strict sense, not only up to homotopy), modules over ring spectra, and algebras over commutative ring spectra, as well as ring maps, module maps, and algebra maps. It is principally the treatment of module spectra and their maps that led us to the use of coloured operads (also called enriched multicategories) in this context.Comment: 34 page

Projet de création du Conseil des collèges du Québec et de la Commission mixte de l'enseignement supérieur et suggestions de modifications au Règlement sur le régime des études collégiales

Mémoire présenté au ministère de l'Éducation et de l'Enseignement supérieur.Comprend des références bibliographique