Orbit simulations of fast-ion transport induced by externally applied 3D magnetic perturbations in the ASDEX Upgrade tokamak.

Externally applied 3D magnetic perturbations break the symmetry of the magnetic field in a tokamak and have an impact on the transport of fast-ions, i.e. suprathermal ions. It was shown that the variation of the toroidal canonical momentum gives a measured for the radial transport of fast-ions. In this thesis, experiments of the ASDEX Upgrade tokamak were analyzed in terms of the radial transport of fast-ions. Simulations using the Monte Carlos orbit-following code ASCOT were carried out in order to study the impact of externally applied 3D magnetic perturbations on the topology of the orbits and to quantify the radial fast-ion transport. The results show that when the magnetic perturbations are applied a drift appears (changing the trajectory of the particle) and the transport created depends on the initial pitch angle, radius and energy of the particles and the equilibrium. Also, it is confirmed that the strong correlation between fast-ion losses and impurity toroidal rotation is related to the trapped-passing boundary .Universidad de Sevilla. Máster Universitario en Física Nuclea

Spectral analysis of Markarian 421 and Markarian 501 with HAWC

The Hight Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory monitors the gamma-ray sky in the energy range from 100 GeV to 100 TeV and has detected two very high energy (VHE) blazars: Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501) in 1.5 years of observations. In this work, we present the spectral analysis above 1 TeV of both sources using a maximum likelihood method and an artificial neural network as an energy estimator. The main objectives are to constrain the spectral curvature of Mrk 421 and Mrk 501 at $\sim$5 TeV using the EBL models from Gilmore et al. (2012) and Franceschini et al. (2008).Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017), Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution

On the link between the coefficient of determination and polarization

In this paper, taking as starting point the link between polarization and dispersion, we reformulate the measure of polarization of Zhang and Kanbur (2001) using the decomposition of the variance instead of the decomposition of the Theil index. The proposed measure is equivalent to the coefficient of determination of an ANOVA Linear Model, that explains the income of the households as a function of any population characteristic e.g. education, gender, occupation etc. This result provides an alternative way to analyze polarization by household characteristics and at the same time allows us to compare sub-populations via the estimated coefficients of the ANOVA model.Polarization, coefficient of determination, ANOVA model.

Munira Mutran & Laura Izarra. Irish Studies in Brazil

Munira Mutran & Laura Izarra. Irish Studies in Brazil. São Paulo: AssociaçãoEditorial Humanitas, 2005, 408 pages