Aplicación de la tecnología GPS para la cuantificación del proceso de readaptación de una lesión de ligamento lateral externo de tobillo: estudio de un caso

GPS y readaptació

Decisiones financieras en Chile : teoria versus practica.

99 p.El propósito de esta memoria es determinar el grado de consistencia que existe entre la teoría y la práctica de las decisiones financieras en las sociedades anónimas abiertas en Chile. Para esto, se aplicó un cuestionario basado en el instrumento utilizado por Graham y Harvey (2002) en un estudio realizado en Estados Unidos. Este cuestionario fue enviado a través de correo tradicional a los gerentes generales de las 245 sociedades anónimas abiertas participantes de la Bolsa de Comercio de Santiago. Se recibieron las respuestas de treinta empresas, lo que corresponde a una tasa de respuesta de 12%. Los resultados indican que las técnicas más utilizadas por las empresas para evaluar propuestas de inversión, son la tasa interna de retorno y el valor actual neto, mientras que el CAPM es el modelo más usado al determinar el costo de capital. Lo anterior es consistente con las técnicas de evaluación y modelo para determinar el costo de capital sugerido por la teoría financiera. No obstante, se encontró una inconsistencia en la técnica de las opciones reales, la cual es la más correcta teóricamente. Sin embargo, es la técnica de menor uso. Se puede conjeturar que el desconocimiento o la complejidad de la técnica explican su baja tasa de uso. Por otro lado, los factores relacionados con la teoría del pecking order fueron los más importantes para las empresas al emitir deuda. Se concluye que hay un alto grado de consistencia entre las predicciones de esta hipótesis y la práctica financiera en Chile

Efectos del entrenamiento interválico de alta intensidad durante el periodo transitorio en jugadores de fútbol sub-19

Actualmente existe un creciente interés por la aplicación del entrenamiento interválico de alta intensidad (HIIT) en fútbol (Buchheit et al. 2013). La eficacia mostrada por esta metodología de entrenamiento para mejorar las variables del rendimiento ha provocado una mayor aplicación en deportes colectivos (Iaia et al. 2009). Sin embargo, es escasa la literatura científica acerca de su impacto en fútbol. Por ello, el objetivo del trabajo es comparar los efectos sobre el rendimiento del HIIT versus entrenamiento tradicional durante el periodo transitorio invernal en jugadores de fútbol sub-19

HAADF-STEM Image Resolution Enhancement Using High-Quality Image Reconstruction Techniques: Case of the Fe3O4(111) Surface

From simple averaging to more sophisticated registration and restoration strategies, such as super-resolution (SR), there exist different computational techniques that use a series of images of the same object to generate enhanced images where noise and other distortions have been reduced. In this work, we provide qualitative and quantitative measurements of this enhancement for high-angle annular dark-field scanning transmission electron microscopy imaging. These images are compared in two ways, qualitatively through visual inspection in real and reciprocal space, and quantitatively, through the calculation of objective measurements, such as signal-to-noise ratio and atom column roundness. Results show that these techniques improve the quality of the images. In this paper, we use an SR methodology that allows us to take advantage of the information present in the image frames and to reliably facilitate the analysis of more difficult regions of interest in experimental images, such as surfaces and interfaces. By acquiring a series of cross-sectional experimental images of magnetite (Fe3O4) thin films (111), we have generated interpolated images using averaging and SR, and reconstructed the atomic structure of the very top surface layer that consists of a full monolayer of Fe, with topmost Fe atoms in tetrahedrally coordinated sites

Satisfaction of students with university institution and academic performance

En el presente artículo, se ha investigado la relación existente entre el rendimiento académico y la satisfacción con la institución educativa en alumnos universitarios. Nuestra hipótesis de partida era que se hallaría una correlación positiva entre ambas variables. Para ello, se utilizó una muestra de 101 estudiantes de Licenciatura en Psicología de la Universidad de Granada. El instrumento de evaluación que se ha utilizado es el SEUE (Satisfacción de los Estudiantes Universitarios con su Educación) de Gento y Vivas (2003). Este instrumento incluye una serie de subdimensiones acerca del constructo estudiado que hemos tenido en cuenta en el análisis estadístico. Tras el análisis de los resultados hemos comprobado que no se ha confirmado la hipótesis, ya que no se observa una correlación significativa entre las variables estudiadas. Junto con la discusión de los resultados, incluimos una serie de limitaciones a tener en cuenta para futuras investigaciones.In the present article, we have investigated the relationship between academic performance and satisfaction with the educational institution in university students. Our hypothesis was that we would be found a positive correlation between both variables. For this, we used a sample of 101 students of degree in psychology at the University of Granada. The assessment tool that has been used is the SEUE (Satisfacción de los Estudiantes Universitarios con su Educación) of Gento and Vivas (2003). This instrument includes some subdimensions about studied construct which we have taken into account in the statistical analysis. After the analysis of the results we have verified that not been confirmed the hypothesis, since there isn´t a significant correlation between the variables studied. Along with the discussion of the results, we have included a series of limitations to keep in mind for future research.Proyecto de innovación docente "ReiDoCrea". Departamento de Psicología Social. Universidad de Granada

High intensity efforts during competition in professional football

The aim, of this work was to quantify the number and duration of the very high-speed running and sprinting events (VHSRS) and the recovery interval between them in 36 first and second division professional soccer players. The players were monitored through GPS devices during two official matches. The average duration of the EMAVS was 2.58 ± 0.44 seconds with an average interval between them of 107.07 ± 67.00 s. The mean heart rate (HR) during the EMAVS was 164.92 ± 12.39 p.p.m., reaching 85% of the maximum HR. No significant differences were found between the duration of the VHSRS, the intervals between them and the HR reached (p≤0.05 in all cases), with great individual variability. The use of the duration of the EMAVS, the recovery times and the HR reached during them, would be very useful to design the interval training in football.El objetivo de este trabajo fue cuantificar el número y duración de los esfuerzos de muy alta intensidad y esprint (EMAVS) y el intervalo de recuperación entre ellos en 36 futbolistas profesionales de primera y de segunda división. Los jugadores fueron monitorizados a través de dispositivos GPS durante dos partidos oficiales. La duración promedio de los EMAVS fue de 2,58±0,44 segundos con un intervalo medio entre los mismos de 107,07±67,00 sg. La FC media durante los EMAVS se situó en 164,92±12,39 p.p.m., alcanzando el 85% de la FC máxima. No se encontraron diferencias significativas entre la duración de los EMAVS, los intervalos entre ellos y la FC alcanzada (p≤ 0,05 en todos los casos), con gran variabilidad individual. La utilización de la duración de los EMAVS, los tiempos de recuperación y la FC alcanzada durante los mismos, serían de gran utilidad para diseñar los entrenamientos interválicos en el fútbo

Global patterns in monthly activity of influenza virus, respiratory syncytial virus, parainfluenza virus, and metapneumovirus: a systematic analysis

Background Influenza virus, respiratory syncytial virus, parainfluenza virus, and metapneumovirus are the most common viruses associated with acute lower respiratory infections in young children (= 65 years). A global report of the monthly activity of these viruses is needed to inform public health strategies and programmes for their control.Methods In this systematic analysis, we compiled data from a systematic literature review of studies published between Jan 1, 2000, and Dec 31, 2017; online datasets; and unpublished research data. Studies were eligible for inclusion if they reported laboratory-confirmed incidence data of human infection of influenza virus, respiratory syncytial virus, parainfluenza virus, or metapneumovirus, or a combination of these, for at least 12 consecutive months (or 52 weeks equivalent); stable testing practice throughout all years reported; virus results among residents in well-defined geographical locations; and aggregated virus results at least on a monthly basis. Data were extracted through a three-stage process, from which we calculated monthly annual average percentage (AAP) as the relative strength of virus activity. We defined duration of epidemics as the minimum number of months to account for 75% of annual positive samples, with each component month defined as an epidemic month. Furthermore, we modelled monthly AAP of influenza virus and respiratory syncytial virus using site-specific temperature and relative humidity for the prediction of local average epidemic months. We also predicted global epidemic months of influenza virus and respiratory syncytial virus on a 5 degrees by 5 degrees grid. The systematic review in this study is registered with PROSPERO, number CRD42018091628.Findings We initally identified 37 335 eligible studies. Of 21 065 studies remaining after exclusion of duplicates, 1081 full-text articles were assessed for eligibility, of which 185 were identified as eligible. We included 246 sites for influenza virus, 183 sites for respiratory syncytial virus, 83 sites for parainfluenza virus, and 65 sites for metapneumovirus. Influenza virus had clear seasonal epidemics in winter months in most temperate sites but timing of epidemics was more variable and less seasonal with decreasing distance from the equator. Unlike influenza virus, respiratory syncytial virus had clear seasonal epidemics in both temperate and tropical regions, starting in late summer months in the tropics of each hemisphere, reaching most temperate sites in winter months. In most temperate sites, influenza virus epidemics occurred later than respiratory syncytial virus (by 0.3 months [95% CI -0.3 to 0.9]) while no clear temporal order was observed in the tropics. Parainfluenza virus epidemics were found mostly in spring and early summer months in each hemisphere. Metapneumovirus epidemics occurred in late winter and spring in most temperate sites but the timing of epidemics was more diverse in the tropics. Influenza virus epidemics had shorter duration (3.8 months [3.6 to 4.0]) in temperate sites and longer duration (5.2 months [4.9 to 5.5]) in the tropics. Duration of epidemics was similar across all sites for respiratory syncytial virus (4.6 months [4.3 to 4.8]), as it was for metapneumovirus (4.8 months [4.4 to 5.1]). By comparison, parainfluenza virus had longer duration of epidemics (6.3 months [6.0 to 6.7]). Our model had good predictability in the average epidemic months of influenza virus in temperate regions and respiratory syncytial virus in both temperate and tropical regions. Through leave-one-out cross validation, the overall prediction error in the onset of epidemics was within 1 month (influenza virus -0.2 months [-0.6 to 0.1]; respiratory syncytial virus 0.1 months [-0.2 to 0.4]).Interpretation This study is the first to provide global representations of month-by-month activity of influenza virus, respiratory syncytial virus, parainfluenza virus, and metapneumovirus. Our model is helpful in predicting the local onset month of influenza virus and respiratory syncytial virus epidemics. The seasonality information has important implications for health services planning, the timing of respiratory syncytial virus passive prophylaxis, and the strategy of influenza virus and future respiratory syncytial virus vaccination. Copyright (C) 2019 The Author(s). Published by Elsevier Ltd

Characterization of dislocations in protein crystals by means of synchrotron double-crystal topography

5 pages, 8 figures.Hen egg-white lysozyme (HEWL) crystals have been studied by means of double-crystal synchrotron topography. The crystals reveal a number of features that are quite well known in hydrothermally grown inorganic crystals: dislocations, growth bands and growth sector boundaries. Dislocations in the sectors have been characterized as edge dislocations with Burgers vector parallel to the c axis. They are distinguishable only under weak beam conditions. The presence of edge dislocations shown in this paper is consistent with the spiral growth steps previously reported. This spiral growth on protein crystals has been observed many times by surface techniques.We are very indebted to Dr M. C. Robert who kindly helped us to examine the topographs and to analyse the various features of their contrast.Peer reviewe