PN-Carbon Yields and the Chemical Evolution of the Galaxy

Two sets of observational carbon stellar yields for low-and-intermediate mass stars are computed from planetary nebulae abundances derived from C II $\lambda4267$ and C III $\lambda\lambda1906+1909$ lines, respectively. By comparing C/O values observed in stars of the solar vicinity and Galactic HII regions with those predicted by chemical evolution models for the Galaxy, which assume these observational yields, I conclude that the C abundances derived from permitted lines are better than those derived from forbidden lines.Comment: 2 pages, Proceedings of the conference "Ionized Gaseous Nebulae", Nov 21-24, 2000; RevMexAA in pres

Jet Production at RHIC and LHC

Recent results on jet production in heavy ion collisions at RHIC and the LHC are discussed, with emphasis on inclusive jet yields and semi-inclusive hadron-triggered and vector boson-triggered recoil jet yields as well as their azimuthal angular correlations. I will also discuss the constraints that these observables impose on the opacity of the medium, the flavour dependence of energy loss, the interplay of perturbative and non perturbative effects and the change of the degrees of freedom of the medium with the resolution of the probe.Comment: 8 pages, 7 figures, proceedings of Quark Matter 2017 conferenc

Alcohol Use In Mexican-Americans By Nativity: The Role Of Ethnic Identity, Acculturation, And Acculturative Stress

The present study examined alcohol use disorder symptoms among Mexican-Americans. Participants consisted of a community-based sample of 237 Mexican-American adults living in the Midwest United States. The role of nativity status and cultural variables in alcohol use disorder symptoms was explored. Specifically, ethnic identity, acculturation, and acculturative stress were used to predict membership into high and low alcohol use disorder symptom groups among U.S.-and foreign-born Mexican-Americans. Additionally, gender, ethnic identity, and acculturative stress were tested as moderators in the relationship between acculturation and alcohol use disorder symptoms. Among U.S.-born participants, only ethnic identity was found to be predictive of alcohol use disorder symptoms, such that higher ethnic identity was related to fewer alcohol use disorder symptoms. Among foreign-born participants, ethnic identity was also predictive of few alcohol use disorder symptoms. Additionally, increased pressure against acculturation was predictive of higher alcohol use disorder symptoms for foreign-born participants. Among the sample as a whole, those with low Latino Orientation and high pressure against acculturation reported more alcohol use disorder symptoms. These results highlight the protective effect of ethnic identity and the need for further research that examines nativity status, acculturation, and specific acculturative stressors in regard to alcohol use disorder symptoms among Mexican-Americans

Out of equilibrium dynamics of classical and quantum complex systems

Equilibrium is a rather ideal situation, the exception rather than the rule in Nature. Whenever the external or internal parameters of a physical system are varied its subsequent relaxation to equilibrium may be either impossible or take very long times. From the point of view of fundamental physics no generic principle such as the ones of thermodynamics allows us to fully understand their behaviour. The alternative is to treat each case separately. It is illusionary to attempt to give, at least at this stage, a complete description of all non-equilibrium situations. Still, one can try to identify and characterise some concrete but still general features of a class of out of equilibrium problems - yet to be identified - and search for a unified description of these. In this report I briefly describe the behaviour and theory of a set of non-equilibrium systems and I try to highlight common features and some general laws that have emerged in recent years.Comment: 36 pages, to be published in Compte Rendus de l'Academie de Sciences, T. Giamarchi e

Effective temperatures out of equilibrium

We describe some interesting effects observed during the evolution of nonequilibrium systems, using domain growth and glassy systems as examples. We breafly discuss the analytical tools that have been recently used to study the dynamics of these systems. We mainly concentrate on one of the results obtained from this study, the violation of the fluctuation-dissipation theorem and we discuss, in particular, its relation to the definition and measurement of effective temperatures out of equilibrium.Comment: 13 pages, RevTex, 2 figs, to appear in ``Trends in Theoretical Physics II'', eds. H Falomir et al, Am. Inst. Phys. Conf. Proc. of the 1998 Buenos Aires meetin