On the use of wavelets to reveal oscillatory patterns in stellar flare emission

Wavelet analysis is a powerful tool to investigate non-stationary signals such as amplitude modulated sinusoids or single events lasting for a small percentage of the observing time. Wavelet analysis can be used, for example, to reveal oscillations in the light curve of stars during coronal flares. A careful treatment of the background in the wavelet scalogram is necessary to determine robust confidence levels required to distinguish between patterns caused by actual oscillations and noise. This work describes the method using synthetic light curves and investigates the effect of background noise when determining confidence levels in the scalogram. The result of this analysis shows that the wavelet transform is able to reveal oscillatory patterns even when frequency-dependent noise is dominant. However, their significance in the wavelet scalogram may be reduced, depending on the assumed background spectrum. To show the power of wavelet analysis, the light curve of a well-known flaring star is analysed. It shows two oscillations overlapped. The lower-frequency oscillation is not mentioned in previous works in the literature. This result demonstrates the need for correctly characterizing the background noise of the signal.Office of Naval Research Global, award no. N62909-15-1-2011.Publicad

Desarrollo de un sistema web para la gestión y monitoreo de los procesos judiciales y de recursos humanos, con informes estadísticos de créditos, agencias y desempeño social para la cooperativa de ahorro y crédito mujeres unidas mediante la utilización del Framework Ruby On Rails y la Librería Reactjs

Desarrollar un sistema web para la Cooperativa de Ahorro y Crédito Mujeres Unidas en la cual se encuentren automatizados todos los procesos de gestión judicial y obtención de indicadores de gestión mediante la utilización del Framework Ruby on Rails y la librería ReactJs con la metodología Scrum.La Cooperativa de Ahorro y Crédito Mujeres Unidas (CACMU) como parte de su labor diaria, realizar muchos procesos internos para gestionar los créditos en estado de mora, para gestionar su plantilla laboral, para obtener información estadística de su cartera, cartera en riesgo, colocaciones, balances sociales, planificaciones de recuperación de cartera al mes, y obtención de indicadores sociales o indicadores de la SEPS. Estos procesos son realizados por los empleados de manera manual lo que provoca una falta de eficiencia para la obtención de información vital para la toma de decisiones y el normal desempeño de las funciones de la cooperativa por lo que se propone automatizar y mejorar dichos procesos de administración y gestión. La implementación del sistema surge a partir de la necesidad de obtener toda esta información actualizada y de manera inmediata por parte de las gerencias y diferentes departamentos de la cooperativa, para la cual se desarrolló el sistema que cumplen todos los requerimientos y satisface las necesidades de la cooperativa. Las tecnologías utilizadas para el desarrollo de este proyecto están divididas en el front-end y el back-end en una misma aplicación monolítica, se utiliza Ruby en su versión 2.4 como lenguaje de programación del back-end junto con el framework Ruby on Rails en su versión 5.1 para la obtención de información y manejo de datos, para el front-end se utilizó el lenguaje JavaScript en su versión ES6 y React en su versión 16.0 para construir las vistas orientadas a componentes para ser mostradas al usuario final, como gestor de base de datos se utilizó PostgreSQL en su versión 9.6 y para obtener la información de la cooperativa se configuró Ruby on Rails para manejar dos gestores de bases de datos dentro de la aplicación y hacer uso de la información de la base de datos Oracledb propia de la cooperativa. Todo el proceso de desarrollo fue realizado bajo la metodología scrum generando los artefactos necesarios de la metodología, para cada iteración de la metodología que entrega una porción del producto terminado se aplicó un ciclo de desarrollo de software (Planificación, Análisis, Diseño, Codificación y Pruebas correspondientes). Finalmente se presenta la evaluación de resultados, donde se evalúa la funcionalidad, satisfacción, aceptación y rendimiento del sistema junto con conclusiones y recomendaciones

On the origin of the jet-like radio/X-ray morphology of G290.1-0.8

The origin and evolution of supernova remnants of the mixed-morphology class is not well understood. Several remnants present distorted radio or X-ray shells with jet-like structures. G290.1-0.8 (MSH 11-61A) belongs to this class. We aim to investigate the nature of this supernova remnant in order to unveil the origin of its particular morphology. We based our work on the study of the X-ray emitting plasma properties and the conditions imposed by the cold interstellar medium where the remnant expanded. We use archival radio, HI line data and X-ray observations from XMM-Newton and Chandra observatories, to study G290.1-0.8 and its surrounding medium. Spatially resolved spectral analysis and mean photon energy maps are used to obtain physical and geometrical parameters of the source. Radio continuum and HI line maps give crucial information to understand the radio/X-ray morphology. The X-ray images show that the remnant presents two opposite symmetric bright spots on a symmetry axis running towards the NW-SE direction. Spectral analysis and mean photon energy maps confirm that the physical conditions of the emitting plasma are not homogeneous throughout the remnant. In fact, both bright spots have higher temperatures than the rest of the plasma and its constituents have not reached ionization equilibrium yet. HI line data reveal low density tube-like structures aligned along the same direction. This evidence supports the idea that the particular X-ray morphology observed is a direct consequence of the structure of the interstellar medium where the remnant evolved. However, the possibility that an undetected point-like object, as a neutron star, exists within the remnant and contributes to the X-ray emission cannot be discarded. Finally, we suggest that a supernova explosion due to the collapse of a high-mass star with a strong bipolar wind can explain the supernova remnant morphology.Comment: 8 pages, 6 figures. Accepted for publication in A&

Maximum likelihood inference for a class of discrete-time Markov-switching time series models with multiple delays

Autoregressive Markov switching (ARMS) time series models are used to represent real-world signals whose dynamics may change over time. They have found application in many areas of the natural and social sciences, as well as in engineering. In general, inference in this kind of systems involves two problems: (a) detecting the number of distinct dynamical models that the signal may adopt and (b) estimating any unknown parameters in these models. In this paper, we introduce a class of ARMS time series models that includes many systems resulting from the discretisation of stochastic delay differential equations (DDEs). Remarkably, this class includes cases in which the discretisation time grid is not necessarily aligned with the delays of the DDE, resulting in discrete-time ARMS models with real (non-integer) delays. We describe methods for the maximum likelihood detection of the number of dynamical modes and the estimation of unknown parameters (including the possibly non-integer delays) and illustrate their application with an ARMS model of El Ni\~no--southern oscillation (ENSO) phenomenon

Tumoral volume measured preoperatively by magnetic resonance imaging is related to survival in endometrial cancer.

Background. The aim of the study was to determine if the endometrial tumor volume (TV) measured by magnetic resonance imaging (MRI-TV) is associated with survival in endometrial cancer and lymph nodes metastases (LN+). Patients and methods. We evaluated the MRI imaging and records of 341 women with endometrial cancer and preoperative MRI from 2008 to 2018. The MRI-TV was calculated using the ellipsoid formula measuring three perpendicular tumor diameters. Tumor myometrial invasion was also analyzed. Results. Higher MRI-TV was associated with age ≥ 65y, non-endometrioid tumors, grade-3, deep-myometrial invasion, LN+ and advanced FIGO stage. There were 37 patients with LN+ (8.8%). Non-endometrioid tumors, deep-myometrial invasion, grade-3 and MRI-TV ≥ 10 cm3 were the factors associated with LN+. Using a receiver operating characteristic [ROC] curve, the MRI-TV cut-off for survival was 10 cm3 (area under curve [AUC] = 0.70; 95% CI: 0.61–0.73). 5 years disease-free (DFS) and overall survival (OS) was significantly lower in MRI-TV ≥ 10 cm3 (69.3% vs. 84.5%, and 75.4% vs. 96.1%, respectively). MRI-TV was considered an independent factor of DFS (HR: 2.20, 95% CI: 1.09–4.45, p = 0.029) and OS (HR: 3.88, 95% CI: 1.34–11.24, p = 0.012) in multivariate analysis. Conclusions. MRI-TV was associated with LN+, and MRI-TV ≥ 10 cm3 was an independent prognostic factor of lower DFS and OS. The MRI-TV can be auxiliary information to plan the surgery strategy and predict the adjuvant treatment in women with endometrial cancer.post-print403 K

Formation of b-Bi2O3 and d-Bi2O3 during laser irradiation of Bi films studied in-situ by spatially resolved Raman spectroscopy

The formation of different phases of Bi2O3 induced by laser irradiation of Bi films has been assessed in situ by micro-Raman spectroscopy as a function of laser wavelength, power density and irradiation time. Raman mapping of the irradiated samples enabled a spatially-resolved study of the distribution of the formed Bi2O3 phases. Red laser (633 nm) irradiation was found to induce the appearance of b-Bi2O3, within a certain range of power densities, by diffusion-controlled processes. In contrast, ultraviolet (UV, 325 nm) laser irradiation, above a certain power density threshold, initially induces the formation of both b and d-Bi2O3 phases. The amount of the produced d-Bi2O3 phase increases by increasing the irradiation time, while that of the b phase follows the opposite trend. UV laser irradiation seems to be a suitable method to produce room temperature stable d-Bi2O3 patterns on Bi film

An efficient wireless power transmitter based on companded OFDM signals

In this work, a waveform design using a combination of OFDM and companding technique is proposed to improve the wireless power transfer (WPT) efficiency without sacrificing the wireless information transfer performance. Employing a Simultaneous Wireless Information and Power Transfer (SWIPT) scheme called Power Splitting (PS) protocol, the transfer of power and data is achieved simultaneously between a Power Beacon (PB) and a receiver node.Furthermore, in order to capture all important nonlinear behaviors of a real energy harvester rectifier circuit, a curve fitting-based nonlinear rectifier model is used.Results show that the use of this companding technique allows the power amplifier (PA) to generate and transmit signals for WPT in a more efficient way, improving also the conversion efficiency of the energy harvester.Fil: Fernández, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina. Universidad Nacional del Sur; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras; ArgentinaFil: Gregorio, Fernando Hugo. Universidad Nacional del Sur; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; ArgentinaFil: López Martínez, Javier. Instituto Universitario de Investigación En Telecomunic; España. Communications And Signal Processing Lab; España. Universidad de Málaga, Cei Andalucía Tech, Etsi Telecom; EspañaFil: Cousseau, Juan Edmundo. Universidad Nacional del Sur; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina2021 XIX Workshop on Information Processing and Control (RPIC)San JuanArgentinaResearch to Practice Inclusive Communitie

La torre sureste del castillo de Santaella (Córdoba). Un ejemplo de arquitectura defensiva medieval

El artículo presentado proporciona los resultados obtenidos con motivo de la actividad arqueológica puntual previa a la restauración de la torre sureste del castillo de Santaella, municipio ubicado en el interior de la Campiña cordobesa. Dicha intervención ha sido desarrollada en el año 2015, fruto del planteamiento que el ayuntamiento de esta localidad inició de cara a la puesta en valor y conservación del patrimonio histórico de su término municipal. Al mismo tiempo que se ejecutaba la intervención susodicha, se ha llevado a cabo un estudio sobre la historia del conjunto de esta fortaleza a través de las diversas fuentes archivísticas disponibles. Entre ellas, cobran especial relevancia las pertenecientes al ámbito cronológico de los siglos XIII-XV. Con la información extraída de los recursos documentales y los datos emanados de los vestigios del torreón mencionado, se ha podido elaborar una primera interpretación de la evolución histórica de este castillo medieval, carente actualmente de un análisis pormenorizado

Estudio del espolón en el calcáneo y de la extracción de los huesos sesamoideos

Partimos de un modelo de pie creado anteriormente para otros estudios. Tanto en el caso del espolón en el calcáneo como en el de los sesamoideos, el trabajo que hemos llevado a cabo es muy similar. Hemos creado los grupos pertinentes en I-DEAS para simular los dos casos y para posteriormente poder observar los resultados en ABAQUS. Una vez creados los grupos, los hemos exportado a ABAQUS, para obtener un archivo .INP que lo modificaremos aportando los datos que tenemos de cargas, condiciones de contorno, propiedades de los tejidos, etc. Con la ayuda de Cluster, realizamos los cálculos y obtenemos un archivo .ODB que es el que nos permitirá abrir ABAQUS para poder observar los resultados. Una vez que visualizamos los resultados, modificamos los límites de las leyendas para poder apreciar de una mejor forma, las variaciones que ha habido en cada caso y poder compararlas con el caso de referencia. Con estos resultados hemos realizado un análisis y obtenido unas conclusiones

Contribution of decision support systems to water management improvement in basins with high evaporation in Mediterranean climates

[EN] The entry into force of Directive 2000/60/EC of the European Parliament and the Council of 23 October 2000 established a new model for the management and protection of surface water and groundwater in Europe. In this sense, a thorough knowledge of the basins is an essential step in achieving this European objective. The utility of integrative decision support systems (DSS) for decision-making in complex systems and multiple objectives allows decision-makers to identify characteristics and improve water management in a basin. In this research, hydrological and water management resource models have been combined, with the assistance of the DSS AQUATOOL, with the aim of deepening the consideration of losses by evaporation of reservoirs for a better design of the basin management rules. The case study treated is an Andalusian basin of the Atlantic zone (Spain). At the same time, different management strategies are analysed based on the optimization of the available resources by means of the conjunctive use of surface water and groundwater.The study was performed with the support of the Ecological Transition Ministry, through the Biodiversity Foundation.Ruíz-Ortíz, V.; García-López, S.; Solera Solera, A.; Paredes Arquiola, J. (2019). Contribution of decision support systems to water management improvement in basins with high evaporation in Mediterranean climates. Hydrology Research. 50(4):1020-1036. https://doi.org/10.2166/nh.2019.014S10201036504Alcamo J. , HenrichT. & RoschT.2000World Water in 2025 – Global Modelling and Scenario Analysis for the World Commission on Water for the 21st Century. Report A0002, Centre for Environmental System Research, University of Kassel, Germany.ALCAMO, J., FLÖRKE, M., & MÄRKER, M. (2007). Future long-term changes in global water resources driven by socio-economic and climatic changes. 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Implementation of a linear optimization water allocation algorithm into a fully integrated physical hydrology model. Advances in Water Resources, 60, 135-147. doi:10.1016/j.advwatres.2013.07.012EC (European Commission) 2012 A Blueprint to Safeguard Europe's Water Resources. European Commission, 14.11.2012 COM (2012) 673 final, Brussels, Belgium.González-Zeas D. 2012 Impacto del cambio climático sobre los usos del agua en Europa (Impact of Climate Change on Water Uses in Europe). PhD thesis, University of Madrid, Madrid, Spain.Junta de Andalucía. Consejería de Medio Ambiente y Ordenación del Territorio. 2016Plan Hidrológico del Guadalete Barbate (2015–2021) (Hydrological Plan of the Guadalete Barbate 2015–2021). http://www.juntadeandalucia.es (accessed 25 May 2018).Li, P., Qian, H., & Wu, J. (2018). Conjunctive use of groundwater and surface water to reduce soil salinization in the Yinchuan Plain, North-West China. 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Conjunctive use of water resources for sustainable irrigated agriculture. Journal of Hydrology, 519, 1688-1697. doi:10.1016/j.jhydrol.2014.09.049Singh, A. (2014). Simulation–optimization modeling for conjunctive water use management. Agricultural Water Management, 141, 23-29. doi:10.1016/j.agwat.2014.04.003Sophocleous, M. (2002). Interactions between groundwater and surface water: the state of the science. Hydrogeology Journal, 10(1), 52-67. doi:10.1007/s10040-001-0170-8Strosser P. , RoussardJ. & GrandmouginB.2007EU Water Saving Potential. ENV.D.2/ETU/2007/0001r. Final Report. 247. http://ec.europa.eu (accessed 2 July 2018).Hassan, S. M. T., Lubczynski, M. W., Niswonger, R. G., & Su, Z. (2014). Surface–groundwater interactions in hard rocks in Sardon Catchment of western Spain: An integrated modeling approach. Journal of Hydrology, 517, 390-410. doi:10.1016/j.jhydrol.2014.05.02