Systematic Study of 3-3-1 Models

We carry a systematic study of possible models based on the local gauge group SU(3)_c X SU(3)_L X U(1)_X. Old and new models emerge from the analysis.Comment: 9 pages, Latex. Talk given at the VIII Mexican Workshop on Particles and Fields, Zacatecas, Mexico, Nov. 14-20, 2001. To appear in the AIP Proceeding

Argentina's labor markets in an era of adjustment

The current economic crisis in Argentina is only partly the result of inappropriate domestic policies to cope with the recent external shocks. Years of inappropriate policies have damaged Argentina's economy. Even if no external shocks had occurred, the country would still have to change the structure of production. Argentina has had trouble sustaining a program of structural adjustment. Its experiences provide policymakers with some lessons in designing a sustainable program to achieve price stability and change the incentive system : a) macroeconomic and trade policies must be consistent; b) labor relations and labor market institutions must be changed including the decentralization of wage bargaining and the elimination of traditional wage policies and general government intervention; c) rigidities and restrictions on labor mobility must be eliminated, leading to less pervasive government intervention in the form of restrictive regulations and spending patterns; and d) public spending must be profoundly changed to reduce social costs during the transition period.Economic Stabilization,Banks&Banking Reform,Municipal Financial Management,Environmental Economics&Policies,Economic Theory&Research

Coherent Pion Production by Neutrinos

In this talk I review the main features of the coherent/diffractive pion production by neutrinos on nuclei. The method is based on PCAC and relates the reaction $\textbf{boson} + \textbf{nucleus} \to \textbf{pion} + \textbf{nucleus}$ to elastic pion-nucleus scattering. Estimates for the expected rates and distributions in neutrino reactions are presented with the help of hadronic data. The absolute rates are significantly smaller than the older estimates which brings theory in agreement with the neutral current measurements and the bounds in charged current reactions.Comment: 5 pages, 7 figures, Proceedings of the Sixth International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt09), May 18-22, Sitges, Barcelona, Spai

Disinfection Potential of the Catalytic Wet Peroxide Oxidation (CWPO) for inactivation of intestinal parasites Giardia lamblia and Cryptosporidium parvum

Introduction WHO (World Health Organization) has estimated that around 24 % of the diseases at a global scale are related to environmental factors like consumption of insecure drinking water. Recent laws have become more stringent about the permitted parameters of quality, including more careful surveillance on the presence of resistant forms of Giardia (cysts) and Cryptosporidium (oocysts) in water for human consumption. It has been pointed out that some particular physicochemical properties of their cysts/oocysts cell walls make them strongly resistant against conventional chlorine disinfection [1]. Moreover, complex mechanisms there implied are not still completely elucidated. Therefore, conventional disinfection by chlorine should be assisted or even replaced by novel, safer technologies like the advanced oxidation processes (AOPs). The CWPO is a very efficient, not expensive AOP [2] that could offer a very interesting performance for effective and safe inactivation of resistant pathogen agents like the cysts/oocysts of the intestinal parasites Giardia and Cryptosporidium, even under very mild conditions of ambient temperature and pressure (15 – 25 °C; < 1 atm). This work is devoted to explore the true potential of the CWPO technology in the inactivation of these couple of resistant forms of dangerous parasites

Confined photon modes with triangular symmetry in hexagonal microcavities in 2D photonic Crystals

We present theoretical and experimental studies of the size and thickness dependencies of the optical emission spectra from microcavities with hexagonal shape in films of two-dimensional photonic crystal. A semiclassical plane-wave model, which takes into account the electrodynamic properties of quasi-2D planar photonic microcavity, is developed to predict the eigenfrequencies of the confined photon modes as a function of both the hexagon-cavity size and the film thickness. Modes with two different symmetries, triangular and hexagonal, are critically analyzed. It is shown that the model of confined photon modes with triangular symmetry gives a better agreement between the predicted eigenmodes and the observed resonances.Comment: 14 pages, 6 figure