26 research outputs found

    Mejoramiento de la fuerza a la resistencia de la natación en la brazada en los estilos libre y mariposa, por medio de una herramienta didáctica como estrategia pedagógica

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    Se ha encontrado que los integrantes del equipo de natación de la Universidad Libre presentan inconvenientes en la fase de remate de las pruebas en los estilos de natación clásica. Mediante las observaciones se ha podido detallar que en los entrenamientos hay una alta exigencia para la práctica y desarrollo del rendimiento de cada integrante, pero aun así todo indica que no es suficiente. Cabe aclarar que nuestro proyecto se basa en el mejoramiento de la fuerza a la resistencia aunque no es el único factor que causa la perdida de una competencia, es uno de los muchos problemas que existen, por una parte están la resistencia a la velocidad y la resistencia a la fuerza con alta intensidad y por otro lado están los factores psicológicos como la madurez en las competencias, la experiencia y la confianza del nadador

    Análisis comparativo de usabilidad de dos plataformas para gestionar la comunicación y estrategia de organizaciones y empresas en redes sociales

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    El objetivo de esta investigación fue hacer un testeo comparativo de usabilidad y facilidad de trabajo en dos programas: Social Hint y Hoot Suite. Ambos son herramientas diseñadas para asistir empresas, agencias y community managers en la moderación y gestión de las redes sociales. Se buscó comparar entre ambas plataformas a nivel de usabilidad y facilidad en el manejo de los sistemas (a nivel de interfaz, manejo de datos, generación de gráficos y estadísticas). El resultado permitió conocer e identificar fortalezas y debilidades a nivel de la gestión de contenidos y medición en redes sociales a través de esos programas y sus principales características de funcionalidad, a través del uso y testeo de ambos programas a través de escalas de medición de actitudes. Los objetivos de la investigación se cumplieron y se generaron nuevos aportes al área del estudio de las Nuevas Tecnologías y la gestión de las redes sociales

    Overview of recent TJ-II stellarator results

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    The main results obtained in the TJ-II stellarator in the last two years are reported. The most important topics investigated have been modelling and validation of impurity transport, validation of gyrokinetic simulations, turbulence characterisation, effect of magnetic configuration on transport, fuelling with pellet injection, fast particles and liquid metal plasma facing components. As regards impurity transport research, a number of working lines exploring several recently discovered effects have been developed: the effect of tangential drifts on stellarator neoclassical transport, the impurity flux driven by electric fields tangent to magnetic surfaces and attempts of experimental validation with Doppler reflectometry of the variation of the radial electric field on the flux surface. Concerning gyrokinetic simulations, two validation activities have been performed, the comparison with measurements of zonal flow relaxation in pellet-induced fast transients and the comparison with experimental poloidal variation of fluctuations amplitude. The impact of radial electric fields on turbulence spreading in the edge and scrape-off layer has been also experimentally characterized using a 2D Langmuir probe array. Another remarkable piece of work has been the investigation of the radial propagation of small temperature perturbations using transfer entropy. Research on the physics and modelling of plasma core fuelling with pellet and tracer-encapsulated solid-pellet injection has produced also relevant results. Neutral beam injection driven Alfvénic activity and its possible control by electron cyclotron current drive has been examined as well in TJ-II. Finally, recent results on alternative plasma facing components based on liquid metals are also presented. ISSN:0029-5515 ISSN:1741-432

    Geographic patterns of tree dispersal modes in Amazonia and their ecological correlates

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    Aim: To investigate the geographic patterns and ecological correlates in the geographic distribution of the most common tree dispersal modes in Amazonia (endozoochory, synzoochory, anemochory and hydrochory). We examined if the proportional abundance of these dispersal modes could be explained by the availability of dispersal agents (disperser-availability hypothesis) and/or the availability of resources for constructing zoochorous fruits (resource-availability hypothesis). Time period: Tree-inventory plots established between 1934 and 2019. Major taxa studied: Trees with a diameter at breast height (DBH) ≥ 9.55 cm. Location: Amazonia, here defined as the lowland rain forests of the Amazon River basin and the Guiana Shield. Methods: We assigned dispersal modes to a total of 5433 species and morphospecies within 1877 tree-inventory plots across terra-firme, seasonally flooded, and permanently flooded forests. We investigated geographic patterns in the proportional abundance of dispersal modes. We performed an abundance-weighted mean pairwise distance (MPD) test and fit generalized linear models (GLMs) to explain the geographic distribution of dispersal modes. Results: Anemochory was significantly, positively associated with mean annual wind speed, and hydrochory was significantly higher in flooded forests. Dispersal modes did not consistently show significant associations with the availability of resources for constructing zoochorous fruits. A lower dissimilarity in dispersal modes, resulting from a higher dominance of endozoochory, occurred in terra-firme forests (excluding podzols) compared to flooded forests. Main conclusions: The disperser-availability hypothesis was well supported for abiotic dispersal modes (anemochory and hydrochory). The availability of resources for constructing zoochorous fruits seems an unlikely explanation for the distribution of dispersal modes in Amazonia. The association between frugivores and the proportional abundance of zoochory requires further research, as tree recruitment not only depends on dispersal vectors but also on conditions that favour or limit seedling recruitment across forest types

    More than 10,000 pre-Columbian earthworks are still hidden throughout Amazonia

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    Indigenous societies are known to have occupied the Amazon basin for more than 12,000 years, but the scale of their influence on Amazonian forests remains uncertain. We report the discovery, using LIDAR (light detection and ranging) information from across the basin, of 24 previously undetected pre-Columbian earthworks beneath the forest canopy. Modeled distribution and abundance of large-scale archaeological sites across Amazonia suggest that between 10,272 and 23,648 sites remain to be discovered and that most will be found in the southwest. We also identified 53 domesticated tree species significantly associated with earthwork occurrence probability, likely suggesting past management practices. Closed-canopy forests across Amazonia are likely to contain thousands of undiscovered archaeological sites around which pre-Columbian societies actively modified forests, a discovery that opens opportunities for better understanding the magnitude of ancient human influence on Amazonia and its current state

    Evaluation of appendicitis risk prediction models in adults with suspected appendicitis

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    Background Appendicitis is the most common general surgical emergency worldwide, but its diagnosis remains challenging. The aim of this study was to determine whether existing risk prediction models can reliably identify patients presenting to hospital in the UK with acute right iliac fossa (RIF) pain who are at low risk of appendicitis. Methods A systematic search was completed to identify all existing appendicitis risk prediction models. Models were validated using UK data from an international prospective cohort study that captured consecutive patients aged 16–45 years presenting to hospital with acute RIF in March to June 2017. The main outcome was best achievable model specificity (proportion of patients who did not have appendicitis correctly classified as low risk) whilst maintaining a failure rate below 5 per cent (proportion of patients identified as low risk who actually had appendicitis). Results Some 5345 patients across 154 UK hospitals were identified, of which two‐thirds (3613 of 5345, 67·6 per cent) were women. Women were more than twice as likely to undergo surgery with removal of a histologically normal appendix (272 of 964, 28·2 per cent) than men (120 of 993, 12·1 per cent) (relative risk 2·33, 95 per cent c.i. 1·92 to 2·84; P < 0·001). Of 15 validated risk prediction models, the Adult Appendicitis Score performed best (cut‐off score 8 or less, specificity 63·1 per cent, failure rate 3·7 per cent). The Appendicitis Inflammatory Response Score performed best for men (cut‐off score 2 or less, specificity 24·7 per cent, failure rate 2·4 per cent). Conclusion Women in the UK had a disproportionate risk of admission without surgical intervention and had high rates of normal appendicectomy. Risk prediction models to support shared decision‐making by identifying adults in the UK at low risk of appendicitis were identified

    Representación mediática de menores extranjeros no acompañados: una propuesta para el uso de las nuevas narrativas

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    The main objective of our research was to develop a communication proposal framed in the new narratives about unaccompanied foreign minors, one of the most stereotyped and vulnerable migrant groups in Spain. To this end, a comprehensive documentary review was carried out and semi-structured interviews were conducted with representatives of NGOs, of policymakers, and of the social group itself in Spain. As a result of this analysis, a guide was designed for the development of communication campaigns based on new narratives, in this case applied to the social group of unaccompanied migrant minors, but this guide could be translatable to other groups of migrants. In addition, following these guidelines, a real communication campaign was implemented with undergraduate advertising students. In this paper we also present the results and conclusions regarding the measurement of the proposal's effectiveness. This exploratory study reveals that the proposal is an effective communication. A general lack of knowledge among the social group has also been observed among those surveyed, which would indicate the need to design and execute similar communication campaigns.El principal objetivo de nuestra investigación consistió en desarrollar una propuesta de comunicación enmarcada en las nuevas narrativas sobre el colectivo de menores extranjeros no acompañados, uno de los colectivos migrantes más estereotipados y vulnerabilizados en España. Con tal fin se llevó a cabo una exhaustiva revisión documental y se realizaron entrevistas semiestructuradas a representantes de ONG, de la administración y del propio colectivo en España. Como resultado del análisis, se diseñó una guía para la elaboración de campañas de comunicación basadas en nuevas narrativas, en este caso aplicadas al colectivo de menores migrantes no acompañados, pero que podría ser extrapolable a otros colectivos de migrantes. Además, siguiendo estas directrices, se implementó una campaña de comunicación real junto con estudiantes del Grado de Publicidad. En esta comunicación presentamos asimismo los resultados y conclusiones relativos a la medición de su eficacia, revelando este estudio exploratorio que se trata de una comunicación efectiva. También se ha observado una falta generalizada de conocimiento sobre el colectivo entre los encuestados, lo que indicaría la necesidad de diseñar y ejecutar campañas de comunicación similares

    ¿Estás bajo de nota? Cuentos para abordar la depresión infantil y mejorar el estado de ánimo a través de la comunicación asertiva

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    Esta cartilla sirve como herramienta de trabajo en las sesiones terapéuticas de los psicólogos infantiles con niños que presentan síntomas de depresión. Mediante dos cuentos se busca enseñarles a identificar las características de la depresión, afrontar los momentos en los que se sienten tristes, identificar formas de comunicación y utilizar un estilo asertivo que les ayude a interactuar socialmente.Introducción Instrucciones para el terapeuta CUENTO Joaquín el tambor silencioso Hojas de trabajo CUENTO Villa Canción Hojas de trabajo Referencias1a ed

    El tiempo que vivimos : COVID 19 y su impacto en nuestras sociedades

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    Desde fines de diciembre de 2019, pero, dramáticamente desde febrero de 2020, el mundo ha comenzado a transcurrir un escenario de incertidumbre total, generado por la posibilidad de contagio y la reproducción exponencial del COVID-19.12 Esta Pandemia ha puesto en el tapete dos fenómenos que parecen dialécticos y contradictorios entre sí. Por un lado, la globalización- proceso del cual esta pandemia es producto- y, por el otro, el cierre de fronteras y la aparición de un estado que debe mostrar autoridad para administrar el riesgo. En estos términos, la pandemia vino a ratificar uno de los desafíos que enfrentan nuestros sociedades a inicios del siglo XXI, las tensiones entre lo global y lo estatal, pero también entre la universalización de la democracia y su realización, así como el imperativo de una necesaria colaboración a nivel subnacional, estatal, regional, internacional y global ante temas que afectan a nuestras sociedades sin reconocimiento de niveles de desarrollo, creencias o condición sociocultural.Fil: Colacrai, Miryam. Universidad Nacional de Rosario; Argentina.Fil: Álvarez, Silvia T. Universidad Nacional del Sur; Argentina
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