On the second Feng-Rao distance of Algebraic Geometry codes related to Arf semigroups

Producción CientíficaWe describe the second (generalized) Feng-Rao distance for elements in an Arf numerical semigroup that are greater than or equal to the conductor of the semigroup. This provides a lower bound for the second Hamming weight for one point AG codes. In particular, we can obtain the second Feng-Rao distance for the codes defined by asymptotically good towers of function fields whose Weierstrass semigroups are inductive. In addition, we compute the second Feng-Rao number, and provide some examples and comparisons with previous results on this topic. These calculations rely on Apéry sets, and thus several results concerning Apéry sets of Arf semigroups are presented.Ministerio de Economía, Industria y Competitividad; y Fondo Europeo de Desarrollo Regional FEDER( Projects MTM2014-55367-P / MTM2015-65764-C3-1-P)Junta de Andalucía (Grant FQM-343)Fundação para a Ciência e a Tecnologia (Project UID/MAT/00297/2013

Hacia la consolidación de las aulas ágiles

La educación ágil está acercando a las aulas las prácticas de mayor éxito en la industria del software, permitiendo que los alumnos comiencen a asimilar una forma de trabajo ampliamente implantada y que, además, experimenten y adquieran algunas de las competencias más demandadas en el mercado de trabajo. Este artículo presenta UVAGILE, un nuevo marco de trabajo basado en Scrum que aborda la organización ágil de procesos de enseñanza-aprendizaje y que fomenta el aprendizaje incremental y la retroalimentación frecuente. Los resultados obtenidos, a partir de la implementación de cuatro aulas ágiles, avalan la efectividad de UVAGILE, tanto por la mejora de los resultados académicos como por las opiniones expresadas por los alumnos.Agile education brings the most successful practices in the software industry into the classroom. It allows our students to learn and practice a widely established framework in the labor market, but also experience and acquire some of its most-demanded soft skills. This paper presents UVAGILE, a new Scrum-based framework that organizes learning projects from an agile perspective, encouraging incremental learning and regular feedback. Our preliminary results, from four agile classrooms, show the UVAGILE effectiveness, both in terms of improved academic grades and positive feedback from participating students.Este trabajo ha sido financiado por el Proyecto de Innovación Docente No. 82 del plan PID-2019/2020 de la Universidad de Valladolid (UVa)

Hacia la Consolidación de las Aulas Ágiles

La educación ágil está acercando a las aulas las prácticas de mayor éxito en la industria del software, posibilitando que los alumnos lleven a cabo su proceso de aprendizaje de acuerdo con una forma de trabajo ampliamente implantada en el mercado laboral y que, a su vez, permite experimentar y adquirir algunas de las soft skills que este demanda. El proyecto UVAGILE surge en este contexto y, durante, su primera anualidad evaluó las posibilidades de implantación de la enseñanza ágil en el ámbito universitario, para lo que introdujo el concepto de aula ágil y realizó una primera prueba piloto con resultados académicos y de satisfacción muy positivos. Esta colección de documento proporciona un resumen de los resultados obtenidos en el proyecto de innovación docente UVagile durante el curso 2019-2020. Más concretamente, se ofrece el artículo “Hacia la consolidación de las aulas ágiles” (publicado en las Actas de las Jornadas sobre Enseñanza Universitaria de la Informática (JENUI): http://actasjenui.aenui.net/) que presenta una visión detallada de la metodología y de los resultados de su aplicación a la docencia en cuatro asignaturas del Grado en Ingeniería Informática de Servicios y Aplicaciones. Además, se ofrece el vídeo de presentación de este artículo, actualizado con algunas conclusiones obtenidas en el aula ágil en desarrollo durante el estado de alarma, del presente 2020. Finalmente, se proporcionan dos presentaciones que ofrecen una visión completa del concepto de aula ágil, tanto desde el punto de vista del docente (que la implementa) como del alumno (que la cursa).Departamento de Informática (Arquitectura y Tecnología de Computadores, Ciencias de la Computación e Inteligencia Artificial, Lenguajes y Sistemas Informáticos

Supercell Convective Environments in Spain based on ERA5: Hail and Non-Hail Differences

Severe convective storms, in particular supercells, are occasionally responsible for a large number of property losses and damage in Spain. This paper aims to study the synoptic configurations and pre-convective environments in a dataset of 262 supercells during 2011–2020 in Spain. The events are grouped into supercells with hail (diameter larger than 5 cm) and without hail and the results are compared. ERA5 reanalysis is used to study the synoptic configurations and proximity atmospheric profiles related to the supercell events at the initial time. In addition, temperature, convective available potential energy, convective inhibition, lifting condensation level, level of free convection, height of freezing level, wind shear and storm-relative helicity are obtained for each event. Results show that supercells are more frequent on the Mediterranean coast during the warm season. Some of the variables analyzed present statistically significant differences between hail and non-hail events. In particular, supercells with hail are characterized by higher median values of most-unstable convective available potential energy than supercells without hail.This research has been supported by the Ministerio de Ciencia e Innovación (grant nos. PID2019‐105306RB‐I00, CGL2016-78702-C2-1-R, and CGL2016-78702-C2-2-R), the ECMWF Special Projects (grant nos. SPESMART and SPESVALE), the H2020 Marie Skłodowska-Curie Actions (grant no. 101019424), and the Ministerio de Ciencia e Innovación (grant nos. PRE2020-092343 and BES-2017-080025)

Comparison of the WRF and HARMONIE models ability for mountain wave warnings

Mountain lee waves usually involve aircraft icing and turbulence events. These weather phenomena, in turn, are a threat to aviation safety. For this reason, mountain lee waves are an interesting subject of study for the scientific community. This paper analyses several mountain lee waves events in the south-east of the Guadarrama mountain range, near the Adolfo Suarez Madrid-Barajas airport (Spain), using the Weather Research and Forecasting (WRF) and the HARMONIE-AROME high-resolution numerical models. For this work, simulated brightness temperature from the optimum WRF parametrization schemes and from the HARMONIE are validated using satellite observations to evaluate the performance of the models in reproducing the lenticular clouds associated to mountain lee waves. The brightness temperature probability density shows interesting differences between both models. Following, a mountain wave characterization is performed simulating some atmospheric variables (wind direction, wind speed, atmospheric stability, liquid water content and temperature) in several grid points located in the leeward, windward and over the summit of the mountains. The characterization results are compared for both numerical models and a decision tree is developed for each to forecast and warn the mountain lee waves, lenticular clouds and icing events with a 24 to 48 h lead time. These warnings are validated using several skill scores, revealing similar results for both models.This work was partially supported by research projects: PID2019- 105306RB-I00, CGL2016-78702-C2-1-R and CGL2016-78702-C2-2-R (SAFEFLIGHT project), FEI-EU-17-16 and SPESMART AND SPESVALE (ECMWF Special Projects). J. Díaz-Fernández acknowledges the grant supported from the MINECO-FPI program (BES-2017)

Analysis of the October 2014 subtropical cyclone using the WRF and the HARMONIE-AROME numerical models: Assessment against observations

Subtropical cyclones (STCs) are low-pressure systems characterized by having a thermal hybrid structure and sharing tropical and extratropical characteristics. These cyclones are widely studied due to their harmful impacts, in some cases, similar to those caused by hurricanes or tropical storms. From a numerical modeling point of view, they are considered a challenge on account of their rapid intensification. That is the reason why this paper analyzes the simulations of the STC that occurred in October 2014 near the Canary Islands through two highresolution numerical models: Weather Research and Forecasting (WRF) and HARMONIE-AROME. In this study, the simulations obtained with both models of this STC are analyzed versus different observational data. METAR data are used to validate some surface simulated variables throughout the STC life while soundings are chosen to study the tropospheric behavior. Finally, MSG-SEVIRI satellite brightness temperature is used to be compared to those brightness temperatures simulated by both models to give information of the cloud top spatial structure of this atmospheric system. The 2 m temperature, 2 m dew-point temperature, and 10 m wind speed variables do not show significant deviations when carrying out the validation of both models against the available METAR data. It is outstanding the good results found for the HARMONIE-AROME model when analyzing the temperature sounding for both analyzed dates. Additionally, regarding the wind speed sounding, better results are presented in general by the HARMONIE-AROME model, being the WRF model slightly better during the pre-STC stage. Moreover, the skillfulness of the HARMONIE-AROME model is highlighted when simulating the infrared brightness temperature and cloud distribution compared to the WRF model.This work was partially supported by research projects: PID2019- 105306RB-I00, PCIN-2014-013-C07-04, and PCIN2016-080 (UE ERANET Plus NEWA Project), CGL2016-78702-C2-1-R and CGL2016- 78702-C2-2-R (SAFEFLIGHT project), FEI-EU-17-16 and the two ECMWF Special Projects (SPESMART and SPESVALE). JJGA is supported by the FJC2018-035821 grant and JDF acknowledges the grant supported from the MINECO-FPI program (BES-2017)

Wind kinetic energy climatology and effective resolution for the ERA5 reanalysis

Producción CientíficaERA5 represents the state of the art for atmospheric reanalyses and is widely used in meteorological and climatological research. In this work, this dataset is evaluated using the wind kinetic energy spectrum. Seasonal climatologies are generated for 30° latitudinal bands in the Northern Hemisphere (periodic domain) and over the North Atlantic area (limited-area domain). The spectra are also assessed to determine the effective resolution of the reanalysis. The results present notable differences between the latitudinal domains, indicating that ERA5 is properly capturing the synoptic conditions. The seasonal variability is adequate too, being winter the most energetic, and summer the least energetic season. The limited area domain results introduce a larger energy density and range. Despite the good results for the synoptic scales, the reanalysis’ spectra are not able to properly reproduce the dissipation rates at mesoscale. This is a source of uncertainties which needs to be taken into account when using the dataset. Finally, a cyclone tropical transition is presented as a case study. The spectrum generated shows a clear difference in energy density at every wavelength, as expected for a highly-energetic status of the atmosphere.Ministerio de Asuntos Económicos y Transformación Digital y Universidad Complutense de Madrid (projects: (PID2019-105306RB-I00 (IBER - CANES), CGL2016-78702 (SAFEFLIGHT), PCIN-2016-080 and FEI-EU-17-16)Publicación en abierto financiada por el Consorcio de Bibliotecas Universitarias de Castilla y León (BUCLE), con cargo al Programa Operativo 2014ES16RFOP009 FEDER 2014-2020 DE CASTILLA Y LEÓN, Actuación:20007-CL - Apoyo Consorcio BUCL

Climatología de ondas de montaña en la Sierra de Guadarrama: caracterización con el modelo meteorológico de alta resolución WRF

Ponencia presentada en: XII Congreso de la Asociación Española de Climatología celebrado en Santiago de Compostela entre el 19 y el 21 de octubre de 2022.[ES]Las ondas de montaña se forman a sotavento de una barrera orográfica y son un tipo de ondas de gravedad a menudo asociadas con fenómenos meteorológicos adversos. Un ejemplo de ellos es la turbulencia, que afecta a la seguridad aérea y ha aparecido en numerosos informes como causa de accidentes aéreos. Por ello, el estudio de las ondas de montaña es un tema importante para prevenir sus efectos en la aviación. En este trabajo se simulan y analizan 68 eventos de ondas de montaña utilizando el modelo numérico de predicción meteorológica de alta resolución Weather Research and Forecasting (WRF). Debido a la frecuencia de estos eventos y al interés socioeconómico, el área de estudio se centra en las inmediaciones del principal aeropuerto de España (Adolfo Suárez Madrid-Barajas). La temperatura de brillo del satélite Meteosat Second Generation ha sido seleccionada como variable observacional para validar las simulaciones de la nubosidad asociada a las ondas de montaña. Se ha comprobado que el WRF es capaz de simular las ondas de montaña incluso sin nubosidad asociada. Además, se ha elaborado una caracterización de los eventos de ondas de montaña en la zona de estudio mediante el análisis de las variables atmosféricas que intervienen en la formación de las ondas de montaña. Los resultados obtenidos muestran diferencias significativas entre los eventos de ondas de montaña con nubosidad asociada y sin ella en las variables de velocidad de viento y de contenido de agua líquida.[EN]Mountain lee waves form in the leeward of an orographic barrier and are a type of gravity wave often associated with adverse meteorological conditions. One example is turbulence, which affects aviation safety and has been reported in several reports as a cause of aircraft accidents. Therefore, the study of mountain lee waves is an important topic in order to prevent their effects on aviation. In this paper, 68 mountain lee wave events are simulated and analyzed using the high-resolution numerical weather prediction model Weather Research and Forecasting (WRF). Due to the frequency of these events and the socio-economic interest, the study area is focused on the vicinity of the main airport in Spain (Adolfo Suárez Madrid-Barajas). The brightness temperature of the Meteosat Second Generation satellite has been selected as an observational data to validate the simulations of the cloudiness associated with mountain lee waves. The results show the ability of WRF to simulate mountain lee waves even without cloudiness associated. In addition, a characterization of mountain lee wave events in the study area has been developed by analyzing the atmospheric variables involved in mountain lee wave formation. The results obtained show significant differences between mountain lee wave events with and without associated cloudiness in the wind speed and liquid water content variables.Este trabajo está respaldado por los siguientes proyectos de investigación: PID2019- 105306RB-I00, CGL2016-78702-C2-1-R y CGL2016-78702-C2-2-R (proyecto SAFEFLIGHT), FEI-EU-17-16 y SPESMART AND SPESVALE (Proyectos Especiales del ECMWF)

Identificación y distribución temporal de transiciones tropicales en el Océano Atlántico Norte

Ponencia presentada en: XII Congreso de la Asociación Española de Climatología celebrado en Santiago de Compostela entre el 19 y el 21 de octubre de 2022.Este trabajo esta parcialmente financiado por los proyectos de investigación PID2019-105306RB-I00 (IBERCANES) and CGL2016-78702 (SAFEFLIGHT). Este trabajo también tiene el apoyo de los Proyectos Especiales del ECMWF SPESMART y SPEVALE. Carlos Calvo-Sancho y Javier Díaz Fernández agradece el contrato otorgado por el Ministerio de Ciencia e Innovación – Programa FPI (PRE2020-092343 y BES-2017-080025, respectivamente)

Pedestrian and Motor Vehicle Traffic Control Practices for Light Rail Transit: Innovations in New Light Rail Transit System, Barcelona, Spain

The focus of this paper is to provide an informative summary on innovative pedestrian and motor vehicle traffic control designs and practices that have been applied to the recently opened light rail system in Barcelona, Spain. In April 2004 Barcelona, the capital of the Catalunya region, opened a completely new light rail system to expand and support its extensive subway, bus, and commuter rail system. Known locally as the Trambaix and Trambesòs, these two light rail lines operate within a broad range of urban environments, both on street and in semiexclusive rights-of-way. Accommodating light rail in these multiple environments while maintaining or improving safety has led local transportation planners and engineers to use a variety of innovative traffic control practices to manage conflicting movements with LRVs and to provide motorists, as well as pedestrians and bicyclists, with better information on which to base their decisions. This paper, based on the author’s site visits and technical discussions with local planners and engineers, summarizes these practices and identifies those that could have the greatest potential for implementation in the United States