2,263 research outputs found

    El viaje del antihéroe. Cárcel, criminalización y movilización durante la Guerra del Chaco (1932-1935)

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    En el contexto de la movilización del ejército paraguayo durante la Guerra del Chaco (1932-1935) el gobierno solicita contar con la participación de presos de la cárcel pública de Asunción. De acuerdo con las fuentes, este colectivo de personas estaba conformado principalmente por gente proveniente del campo, en su mayoría agricultores, que habían sido criminalizados y considerados enemigos de la sociedad. El artículo, a partir de este llamado a las armas de la población carcelaria, explica el entrelazado legal con el orden consuetudinario en un contexto de prisión revelando que la práctica de utilización de mano de obra de reclusos ha resultado una constante a lo largo del siglo XX

    Investigation of Coulomb dipole polarization effects on reactions involving exotic nuclei

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    We have analyzed elastic scattering angular distributions and total reaction cross sections of the exotic nuclei Li9,11 on Pb208, at energies below and above the Coulomb barrier. For this purpose, we have used an optical potential with no adjustable parameters, composed by the nuclear São Paulo potential, derived from the nonlocal nature of the interaction, and the Coulomb dipole polarization potential, derived from the semiclassical theory of Coulomb excitation. Within this formalism, we identified an unusual long-range absorption for the Li11+Pb208 system, which is dominated by the Coulomb interaction. We compare it to the absorption mechanisms observed for He6+Pb208 which, unlike those of Li11+Pb208, take place at small interacting distances, where both Coulomb and nuclear interactions are important. The proposed approach shows to be a fundamental basis to study reactions involving exotic nuclei

    Frustración de las necesidades psicológicas, motivación y burnout en entrenadores : incidencia de la formación

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    El objetivo del estudio era analizar la incidencia de la formación (federativa y académica general) de los entrenadores sobre variables psicológicas motivacionales (frustración de las necesidades psicológicas básicas (NPB), autodeterminación), eficacia profesional y agotamiento emocional. Para ello, participaron 147 entrenadores de 26 deportes diferentes en categorías de iniciación. Los resultados demostraron que los entrenadores con titulación deportiva intermedia tenían una motivación más intrínseca que los no cualificados, mientras que los entrenadores con mayor titulación se sentían más eficaces y más agotados. Asimismo, los entrenadores con mayor titulación académica general obtuvieron menores niveles de frustración en las NPB de competencia y relaciones sociales. Por tanto, la cualificación de los entrenadores determina los niveles de frustración de las NPB, el grado de motivación y dos dimensiones del burnout, la eficacia profesional y el agotamiento emocional.The aim of this study was to examine coaches' training (federative and general academic) incidence on motivational psychological variables (frustration of the basic psychological needs (BPN), self determination, professional efficacy and emotional burnout). Thus, 147 coaches belonged to 26 different sports in training categories participated in the study. Results showed that coaches with medium sport qualification had a greater intrinsic motivation than those who were not qualified, whereas coaches with higher qualification showed more efficacy and burnout. Moreover, coaches with greater general academic degree had low levels of frustration in the BPN of competence and relatedness. Therefore, coaches' qualification determine their frustration of the BPN, level of motivation and two burnout dimensions, professional efficacy and emotional burnout.O objectivo deste estudo foi analisar a incidência da formação de treinadores (federativa e académica geral) nas variáveis psicológicas motivacionais (frustração das necessidades psicológicas básicas (NPB), autodeterminação, eficácia profissional e burnout emocional). Assim, participaram no estudo 147 treinadores dos escalões de formação de 26 modalidades desportivas diferentes. Os resultados mostraram que os treinadores com qualificação desportiva média tinham maior motivação intrínseca do que aqueles que não eram qualificados, enquanto os treinadores com maior qualificação apresentaram maior eficácia e burnout. Adicionalmente, treinadores com maior grau académico geral tinham baixos níveis de frustração das NPB de competência e relação. Como tal, a qualificação dos treinadores determina a frustração das suas NPB, o nível de motivação e duas dimensões de burnout, eficácia profissional e burnout emocional

    Simultaneous analysis of elastic, breakup, and fusion channels for 6He induced reactions at energies near the coulomb barrier

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    5th International Conference FUSION11We present some recent applications of the Continuum-Discretized Coupled-Channels (CDCC) and Coupled-Reaction-Channels (CRC) methods to the study of reactions induced by weakly-bound nuclei on stable targets. The methods are applied to the scattering of the Borromean nucleus 6He at energies around the Coulomb barrier. Elastic scattering data are very well described by four-body CDCC calculations (based on a three-body description of the 6He nucleus) but also by simpler three-body CDCC calculations, using a suitable two-body model for 6He. By contrast, inclusive α data are better described using the CRC approach, which treats the breakup within the transfer to the continuum picture and, unlike the CDCC method, allows the inclusion of transfer to bound states of the target. We explore also the possibility of calculating the fusion cross sections using the CRC frameworkMinisterio de Ciencia e Innovación FPA2009-0765

    The 6He Optical Potential at energies around the Coulomb barrier

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    We present an Optical Model (OM) study of 6He on 208Pb elastic scattering data, measured at laboratory energies around the Coulomb barrier (Elab=14, 16, 18, 22, and 27 MeV) [1]. For the projectile-target bare interaction, we use the microscopic São Paulo Potential (SPP). This bare interaction is supplemented with a Coulomb Dipole Polarization (CDP) potential, as well as a diffuse complex Woods-Saxon potential. Four-body Continuum-Discretized-Coupled-Channels (CDCC) calculations have been performed in order to support the optical model analysis. We have also studied the α channel, which is the dominant reaction process. In the analysis of this channel, we compare the angular and energy distributions of the α particles measured at 22 MeV, with Distorted Wave Born Approximation (DWBA) calculations

    GENder perspective in Computer Engineering: GENCE questionnaire

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    El objetivo del cuestionario GENCE (GENder perspective in Computer Engineering) es identificar la opinión de las personas que cursan estudios de Ingeniería Informática en cuestiones relacionadas con el género y la informática. El cuestionario se ha diseñado como instrumento para medir el impacto de la incorporación de la perspectiva de género en los currículos de Ingeniería Informática

    Mechanical behaviour of grapevine wood affected by Xylotrechus arvicola

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    [EN] The cerambycid insect Xylotrechus arvicola is considered a pest that affects the wood of the grapevine (Vitis vinifera) in the major wine areas of the Iberian Peninsula. The larva of this insect perforates the grapevine wood, resulting in structural and biomechanical failure of the vine plants. Vine samples from wood damaged by X. arvicola larvae were picked up from different vineyards and grape varieties. Compressive and flexural tests were performed in order to assess the mechanical behaviour of the wood samples. Total length of the cracks in wood samples (TLCWS) that appeared on the surface of the grapevine wood samples after the mechanical tests was measured. Compressive strength (CS) and flexural strength (FS) decreased with the increase of the cross-sectional area (CSA) of both branches and trunks, regardless of damage condition or water content. Moreover, the resistance was lower in damaged wood. In addition, this was verified through the linear regression coefficients of the interaction CS x CSA and FS x CSA. TLCWS in branches and trunks of damaged samples was greater that in undamaged samples. Also, TLCWS within the same damage condition and part of the plant was higher in dry samples than in fresh samples. The damaged wood would show a higher vulnerability to common mechanical stress suffered by the grapevines in the field including heavy winds, fruit overweight or harvesting machines shaking (when mechanically collected). Larvae of this insect altered the mechanical behaviour of the trunk and branches of grapevine wood. The mechanical strength of wood was more negatively affected when the CSA of the branches and trunks increased. Longer TLCWS was found in affected wood
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