Critical behavior of three-dimensional disordered Potts models with many states

We study the 3D Disordered Potts Model with p = 5 and p = 6. Our numerical simulations (that severely slow down for increasing p) detect a very clear spin glass phase transition. We evaluate the critical exponents and the critical value of the temperature, and we use known results at lower p values to discuss how they evolve for increasing p. We do not find any sign of the presence of a transition to a ferromagnetic regime.

Coaliciones promotoras y transparencia en México: el caso de las políticas de derecho de acceso a la información en la administración pública federal 2002-2014

Mexico is now one of the countries with better policies on transparency and access to public information, according to various indicators and academics. Just fifteen years ago, Mexico was a country that lacked legal instruments thereon, whereby the institutions were deeply opaque and citizens could not exercise this right of access to public information. The development of the right of access to public information, in both law and public policy, a milestone in the history of Mexico. It has been, therefore gestation, as its formulation and implementation. In Mexico there have existed diverse social movements that have promoted democratization and the defense of human rights. In the framework of these movements the fight registers for the right of access to the public information that one presents as a successful model of civic action and government intervention, without for it, not to know the challenges that his deepening has still and take root both in the company and in the political class in general. How was it achieved to construct a new institutional of transparency that was functional? How was it possible that the above mentioned change was achieved? These are questions that interests formulated to the political science and to the public administration for the analysis of the change and improvement of institutions. The study of the political change is relevant since the public policies precisely try to solve a problem, to transform a reality but not always the change is achieved, is not even realized of successful form. In a nascent democratic regime, it turns out important to know what factors can collaborate in the conformation of a public successful sustainable politics in the time. Even more, on having treated itself about a substantive politics that it gives content and viability itself to the democracy in a marked country historically and culturally for the opaqueness and the corruption...

Ion heating in transitions to CERC in the stellarator TJ-II

In TJ-II stellarator plasmas, in the electron cyclotron heating regime, an increase in the ion temperature is observed, synchronized with that of the electron temperature, during the transition to the core electron-root confinement (CERC) regime. This rise in ion temperature should be attributed to the joint action of the electron–ion energy transfer (which changes slightly during the CERC formation) and an enhancement of the ion confinement. This improvement must be related to the increase in the positive electric field in the core region. In this paper, we confirm this hypothesis by estimating the ion collisional transport in TJ-II under the physical conditions established before and after the transition to CERC. We calculate a large number of ion orbits in the guiding-centre approximation considering the collisions with a background plasma composed of electrons and ions. The ion temperature profile and the thermal flux are calculated in a self-consistent way, so that the change in the ion heat transport can be assessed.