The influence of the subject Extensión Rural and therefore it was discussed the valué of social subjects, vvithin the formation of the agronomist of the Facultad Ciencias Agrarias- Universidad Nacional of Litoral (FCA-UNL) in the framework of the existing curriculum. The inquiry was conducted through surveys on all cohorts encountered in the data base which provides Gradúate Center. In the origins of the FCA professional profile was oriented towards the importance of the social componen! in the farming activity. With the passage of time this guidance was its formalization in current professional profile, based on the creation of the Chair of Rural oulreach and an axis of the social área that runs along the curriculum since the beginning until the end of the Race.

Se abordó la influencia de la asignatura Extensión Rural y por ende el valor de las asignaturas sociales, dentro de la formación del ingeniero agrónomo de la Facultad de Ciencias Agrarias- Universidad Nacional del Litoral (FCA-UNL) en el marco del plan de estudio vigente. La indagación se realizó a través de encuestas sobre todas las cohortes que se encontraban en la base de datos que dispone el Centro de Graduados. En los orígenes de la FCA el perfil profesional estuvo orientado hacia la importancia del componente social en la actividad agropecuaria. Con el correr del tiempo esta orientación obtuvo su formalización en el perfil profesional actual, en base a la creación de la cátedra de Extensión Rural y un eje del área social que recorre el curriculum desde el inicio hasta el final de la carrera.

We analyze the effect of final state interactions (FSI) on coincidence spectra in nonmesonic hypernuclear weak decay, ΛN → nN, as a function of the kinetic energy sum, EnN = En+ E N, both for np and nn events. Adopting a formalism recently developed, the effects of FSI originated from the interaction between the outgoing nucleons and those in the residual core are included analytically in a very simple way within the eikonal approximation through the modification of the emerging particles momenta. Numerical results are shown for 5ΛHe and 12ΛC hypernucleus. We found that coincidence spectra are only slightly modified and the disagreement between theory and experimental data still persists, mainly for nn events in 5ΛHe where enough statistics exists. We conclude that admixtures of excitations in the final state produced by FSI need to be added to our approach in order to improve the agreement with data.

We derive general analytical expressions for the evaluation of the intrinsic asymmetry parameter in nonmesonic hypernuclear weak decay, within an independent particle shell model framework. Present formalism is valid for even-even, even-odd and odd-odd core hypernucleus. A standard strangeness-changing weak transition potential with exchange of the complete meson octet (π, η, K, ρ, ω, K*) is assumed. Very simple analytical formulas are obtained within the s-wave approximation when we restrict to the π and π+K exchange models, providing an useful and manageable tool to understand the origin of the discrepancies between theoretical and experimental results. Numerical values for 4ΛHe, 5ΛHe, 11ΛB, 12ΛC, 16ΛO, 17ΛO and 28ΛSi hypernuclei are exhibited. Present formalism could be used to understand why new contributions to the exchange potential allow to obtain good agreement with data, as indicated in very recent works. The necessity of a consistent inclusion of: i) different modifications of the exchange potential (two-pion exchange, a1 meson, ΔT = 3/2 terms coming from vector mesons, etc); ii) final state interactions on primary nucleons inside the residual nucleus and also correlations between the free emitted ones; and iii) configuration mixing in the final system, is remarked.

The high momentum transfer electron-nucleus scattering cross section is evaluated within the plane wave impulse approximation (PWIA) supplemented by the relativistic Hartree approximation (RHA). Binding effects on the struck nucleon are introduced through the scalar and vector meson-exchange fields within the framework of quantum hadrodynamics. This model naturally satisfies the current conservation, with the off-shell nucleons behaving as being on the mass shell but having an effective mass. The nucleon inelastic response is included via different parameterizations of the structure function measured at SLAC, while the smearing of the Fermi surface is introduced through a momentum distribution obtained from a perturbative nuclear matter calculation. Recent CEBAF data on inclusive scattering of 4.05 GeV electrons on 56Fe are well reproduced for all measured geometries by the first time. Scaling effects are analyzed as well, and the scaling properties of the nuclear response in terms of the y variable associated to the PWIA within the RHA framework are discussed. The theoretical scaling function obtained in our approach also significantly improves previous PWIA calculations within the multi-GeV electron scattering regime, and describes properly the CEBAF scaling data.

Copolymers of aniline and 2-aminobenzoic acid are prepared by chemical copolymerization. The copolymers are soluble in basic media and thin films are prepared, onto glassy carbon electrodes, by evaporation of the solutions. The modified electrodes show a voltammetric response, with two peaks, similar to polyaniline with two peaks. The dependence of both peak potentials on pH is similar to that of PANI, suggesting that proton expulsion is the mechanism of charge compensation on oxidation. The mechanism is confirmed by Probe Beam Deflection, which shows proton expulsion on oxidation. However, while polyaniline films exchange mainly anions at pH>0, poly(aniline-co-(2-aminobenzoic acid)) (p2ABA) film exchange protons up to pH 4 .

Hybrid films of poly(o-aminophenol) and nickel sulfonated phtalocyanine are produced by electrochemical polymerization of o-aminophenol in the presence of the metal complex. The irreversible incorporation of the metal complex into the hybrid films is tested using reflectance infrared spectroscopy. Electrodes modified with poly(o-aminophenol) alone and the hybrid film show a higher electrocatalytic activity, for NO oxidation, than the base substrate electrode (glassy carbon). The hybrid films show higher currents and lower oxidation overpotential. The oxidation peak current is linear with concentration up to 200 sm M of NO.