Una experiencia de radio comunitaria con aborígenes wichí

El artículo presenta algunos de los impactos producidos por la experiencia de creación de una radio comunitaria wichí, en Formosa (Argentina). Se sintetizan aspectos relacionados con la producción radiofónica bilingüe protagonizada por los jóvenes wichí. Se abordan los modos en que un medio comunitario, como espacio de comunicación, provoca procesos relacionados con las identidades aborígenes y con el diálogo intercultural, de singular significación en tiempos de globalización.________________________________This paper shows the impact experienced by the creation of a community radio station. We reduce some aspects related to the production of bilingual programmes. The major part of this production was under-taken by young people of the wichi community. This article synthesises the most important aspects related to the production of the bilingual programmes. By means of this participative process, we facilitate the ability of the aborigenes to develop their identity and the intercultural dialogue of great importance in the context of globalisation

Seleção de características aplicada ao processamento de imagens digitais.

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Programming for young children using tangible tiles and camera-enabled handheld devices

Schools are trying to teach programming at an earlier age, but there are some difficulties, namely the cost of having enough computer stations for the kids. We present the tangible system Tactode for young students to learn to program in the classroom, using handheld camera devices. The system was tested with a small focus group of students between 10 and 12 years old, that were asked to draw a regular polygon using the Scratch cat. All students completed the required task although some required help. Both students and teachers reported that they thoroughly enjoyed the experience and would like to repeat. In questionaries following the activities, the students declared that they found the language easy to use, with only 14% deeming it somewhat difficult. We consider these early results encouraging as well as informative for future developments

REXIB: Remote Experiments Interface Builder

Remote Experimentation is an educational resource that allows teachers to strengthen the practical contents of science & engineering courses. However, building up the interfaces to remote experiments is not a trivial task. Although teachers normally master the practical contents addressed by a particular remote experiment they usually lack the programming skills required to quickly build up the corresponding web interface. This paper describes the automatic generation of experiment interfaces through a web-accessible Java application. The application displays a list of existent modules and once the requested modules have been selected, it generates the code that enables the browser to display the experiment interface. The tools main advantage is enabling non-tech teachers to create their own remote experiments

Energetic Particle Tracing in Optimized Quasisymmetric Stellarator Equilibria

Recent developments in the design of magnetic confinement fusion devices have allowed the construction of exceptionally optimized stellarator configurations. The near-axis expansion in particular has proven to enable the construction of magnetic configurations with good confinement properties while taking only a fraction of the usual computation time to generate optimized magnetic equilibria. However, not much is known about the overall features of fast-particle orbits computed in such analytical, yet simplified, equilibria when compared to those originating from accurate equilibrium solutions. This work aims to assess and demonstrate the potential of the near-axis expansion to provide accurate information on particle orbits and to compute loss fractions in moderate to high aspect ratios. The configurations used here are all scaled to fusion-relevant parameters and approximate quasisymmetry in various degrees. This allows us to understand how deviations from quasisymmetry affect particle orbits and what are their effects on the estimation of the loss fraction. Guiding-center trajectories of fusion-born alpha particles are traced using gyronimo and SIMPLE codes under the NEAT framework, showing good numerical agreement. Discrepancies between near-axis and MHD fields have minor effects on passing particles but significant effects on trapped particles, especially in quasihelically symmetric magnetic fields. Effective expressions were found for estimating orbit widths and passing-trapped separatrix in quasisymmetric near-axis fields. Loss fractions agree in the prompt losses regime but diverge afterward.Comment: 24 pages, 15 figure

La dimensión de la subjetividad en la formación del valor inmobiliario : aplicación del método de análisis de ecuaciones estructurales al mercado residencial de Lisboa

The discretionality and the appraisers’ subjectivity that characterize traditional real estate valuation are still allowed to take part in the formation of the asset price even when respecting international standards (EVS, IVS) or Appraisal Institution´s regulations (TEGOVA, RICS, etc.). The application of econometric and statistical methods to real estate valuation aims at the elimination of subjectivity on the appraisal process. But the unanswered question underneath this subject is the following: How important is the subjective component on real estate appraisal value formation? On this study Structural Equation Models (SEM) are used to determine the importance of the objective and subjective components on real estate valuation value formation as well as the weight of economic factors and the current economic context on real estate appraisal for mortgage purposes price formation. There were used two latent variables, Objective Component and Subjective Component, witch aggregate objective observed variables and subjective observed and unobserved variables, respectively. Factorial Exploratory Analysis is the statistical technique used in order to link the observed variables extracted from the valuation appraisal reports to the latent constructs derived from the theoretical model. SEM models were used to refine the model, eliminate non‐significant variables and to determine the weight of Objective and Subjective latent variables. These techniques were applied to a sample of over 11.000 real estate assets appraisal reports throughout the time period between November of 2006 and April of 2012. The real assets used on this study are located on Lisbon’s Metropolitan Area – “Grande Lisboa” –, Portugal. From this study, we conclude that Subjective Component has a considerable weight on real estate appraisal value formation and that the external factor Economic Situation has a very small impact on real estate appraisal value formation