Procesos de flexibilidad laboral en la industria maquiladora, sus particularidades y efectos desde una perspectiva étnica y regional. El caso de las y los trabajadores hombres y mujeres yaquis en Empalme, Sonora

Este trabajo presenta una panorámica de la incorporación de las y los yaquis a estas empresas y las especificidades que resultan de este proceso local con influencias globalizadoras. Existe una variedad de expectativas, estereotipos y maneras de organizar la producción y la contratación de personal, que toman formas concretas en cada contexto particular en el que se desarrollan estos procesos. Por esta razón, se propone aquí hacer un pequeño análisis sobre las características y efectos que tiene la estructuración del trabajo en las maquiladoras, identificando sus efectos y particularidades en lo referente a las y los trabajadores yaquis.ITESO, A.C.Universidad de Sonor

Rafanell, August: El nom de la llengua. El concepte de llemosí en la historia del catalá.

Sin resume

The magnetic precursor of L1448-mm: Excitation differences between ion and neutral fluids

Shock modelling predicts an electron density enhancement within the magnetic precursor of C-shocks. Previous observations of SiO, H13CO+, HN13C and H13CN toward the young L1448-mm outflow showed an over-excitation of the ion fluid that was attributed to an electron density enhancement in the precursor. We re-visit this interpretation and test if it still holds when we consider different source morphologies and kinetic temperatures for the observed molecules, and also give some insight on the spatial extent of the electron density enhancement around L1448-mm. We estimate the opacities of H13CO+ and HN13C by observing the J=3\to2 lines of rarer isotopologues to confirm that the emission is optically thin. To model the excitation of the molecules, we use the large velocity gradient (LVG) approximation with updated collisional coefficients to i) re- analyse the observations toward the positions where the over-excitation of H13CO+ has previously been observed [i.e. toward L1448- mm at offsets (0,0) and (0,-10)], and ii) to investigate if the electron density enhancement is still required for the cases of extended and compact emission, and for kinetic temperatures of up to 400 K. We also report several lines of SiO, HN13C and H13CO+ toward new positions around this outflow, to investigate the spatial extent of the over-excitation of the ions in L1448-mm. From the isotopologue observations, we find that the emission of H13CO+ and HN13C from the precursor is optically thin if this emission is extended. Using the new collisional coefficients, an electron density enhancement is still needed to explain the excitation of H13CO+ for extended emission and for gas temperatures of\le 400 K toward L1448-mm (0,-10), and possibly also toward L1448-mm (0,0). For compact emission the data cannot be fitted. We do not find any evidence for the over-excitation of the ion fluid toward the newly observed positions around L1448-mm. The observed line emission of SiO, H13CO+ and HN13C toward L1448-mm (0,0) and (0,-10) is consistent with an electron density enhancement in the precursor component, if this emission is spatially extended. This is also true for the case of high gas temperatures (\le400 K) toward the (0,-10) offset. The electron density enhancement seems to be restricted to the southern, redshifted lobe of the L1448-mm outflow. Interferometric images of the line emission of these molecules are needed to confirm the spatial extent of the over-excitation of the ions and thus, of the electron density enhancement in the magnetic precursor of L1448-mm.Comment: Accepted for publication in A&A; 9 pages, 3 figure

“Lo somni”, en la línea del ensayo moderno

This study is an application of the notes about modern essay to the important Bernat Metge’s dialogue Lo somni, the first and most important work of Catalan Humanism. The result of this study is that this work can be considered as a precedent of this genre, as has been the case with Seneca’s epistles