On the Invariance of the Set of Core Matchings with Respect to Preference Profiles

We consider the general many-to-one matching model with ordinal preferences and give a procedure to partition the set of preference profiles into subsets with the property that all preference profiles in the same subset have the same Core. We also show how to identify a profile of (incomplete) binary relations containing the minimal information needed to generate as strict extensions all the (complete) preference profiles with the same Core. This is important for applications since it reduces the amount of information that agents have to reveal about their preference relations to centralized Core matching mechanisms; moreover, this reduction is maximal.Matching, Core

Through a glass darkly: a case for the study of virtual space

This paper begins to examine the similarities and differences between virtual space and real space, as taken from anarchitectural (as opposed to a biological, psychological, geographic, philosophical or information theoretic)standpoint. It continues by introducing a number of criteria, suggested by the authors as being necessary for virtualspace to be used in a manner consistent with our experience of real space. Finally, it concludes by suggesting apedagogical framework for the benefits and associated learning outcomes of the study and examination of thisrelationship. This is accompanied by examples of recent student work, which set out to investigate this relationship

Validation of the Portuguese Version of the Healthy Lifestyle Questionnaire

The main objective of this study was the validation of the Healthy Lifestyle Questionnaire (EVS II), using a confirmatory factorial analysis of the measurement model, with veteran athletes. A total of 348 veteran Portuguese athletes of both genders, aged between 30 and 60 years (M = 41.64, SD = 9.83), of whom 200 were males and 148 were females, from several sports. The results of the confirmatory factor analysis demonstrate the adequacy of the adapted version of the EVS II, as the factorial structure (6 factors/24 items) has acceptable validity indexes: χ2 = 305.925, p = 0.000, df = 120.017, χ2/df = 2.549, NFI (Normed Fit Index) = 0.909, TLI (Tucker Lewis Index) = 0.918, CFI (Comparative Fit Index) = 0.944, GFI (Goodness of Fit Index) = 0.944, AGFI (Adjusted Goodness of Fit Index) = 0.909, SRMR (Standardized Root Mean Square Residual) = 0.048, RMSEA (Root Mean Square of Approximation) = 0.060, allowing evaluation of the dimensions of balanced diet, respect for mealtime, tobacco and alcohol consumption, other drugs consumption and resting habits. The adaptation to sport of the Portuguese version of EVS II can be used with reasonable confidence in the evaluation of healthy lifestyles in the context of sportinfo:eu-repo/semantics/publishedVersio

Morphological changes, beach inundation and overwash caused by an extreme storm on a low-lying embayed beach bounded by a dune system (NW Mediterranean)

The geomorphological evolution of a low-lying, micro-tidal sandy beach in the western Mediterranean, Pals beach, was characterized using airborne Light Detection and Ranging (LiDAR) data. Data were collected in prior to and six months after the impact of an extreme storm with a return period of approx. 50 years, with the aim of characterizing the beach's response to the storm. The use of repeated high-resolution topographic data to quantify beach geomorphic changes has allowed assessment of the accuracy of different proxies for estimating beach volume changes. Results revealed that changes in the shoreline position cannot accurately reproduce beach volume changes on low-lying beaches where overwash processes are significant. Observations also suggested that volume estimations from beach profiles do not accurately represent subaerial volume changes at large profile distances on beaches with significant alongshore geomorphological variability. Accordingly, the segmentation of the beach into regularly spaced bins is proposed to assess alongshore variations in the beach volume with the accuracy of the topographic data. The morphological evolution of Pals beach during the study period showed a net shoreline retreat (- 4 m) and a significant sediment gain on the subaerial beach (+ 7.5 m3/m). The net gain of sediment is mostly due to the impact of the extreme storm, driving significant overwash processes that transport sediment landwards, increasing volume on the backshore and dunes. The increase of volume on the foreshore and the presence of cuspate morphologies along the shoreline also evidence post-storm beach recovery. Observed morphological changes exhibit a high variability along the beach related to variations in beach morphology. Changes in the morphology and migration of megacusps result in a high variability in the shoreline position and foreshore volume changes. On the other hand, larger morphological changes on the backshore and larger inundation distances occur when the beach and the dunes are lower, favouring the dominance of overwash. The observed storm-induced morphological changes differ from predicted beach storm impacts because of spatial and temporal variations in the beach morphology, suggesting that detailed morphological parameters and indicators used for predicting beach vulnerability to storms should be regularly updated in order to represent the pre-storm beach conditions. Finally, observed morphological changes in Pals Bay evidenced a different behaviour between natural and urban areas, with better post-storm beach recovery on natural areas where the beach is not artificially narrowed.Peer ReviewedPostprint (author's final draft

Estrategias de aprendizaje: uves heuristicas y mapas mentales para evidenciar aprendizajes en matematicas

La investigación estableció como objetivo medir el impacto de los Mapas Mentales y las UVES Heurísticas, en el incremento de las habilidades matemáticas en los estudiantes del programa de Ingeniería de Sistemas del tercer semestre de la Universidad Cooperativa de Colombia, tomándose como muestra representativa a 20 estudiantes a los cuales se les implemento un diseño cuasiexperimental de series cronológicas. Inicialmente los estudiantes dieron respuesta a una encuesta de tipo cualitativo manejado por el método de la escala Lickert, instrumento que permitió verificar las conclusiones encontradas en la prueba de hipótesis de tipo cuantitativo. Para comprobar la hipótesis de que los mapas mentales y las uves heurísticas si contribuyen a la comprensión planteo y desarrollo de los problemas matemáticos, se diseñaron una serie de pruebas que fueron aplicadas en cuatro momentos (pre-prueba y pos-prueba) conformados por dos problemas matemáticos manejados con estrategias heurísticas para los problemas de la pre-prueba; los mapas mentales para la comprensión y las Uves heurísticas para el planteo y desarrollo en la pos-prueba. La hipótesis se demostró utilizando la prueba no paramétrica de diferencias de Wilcoxon para muestras pequeñas. La prueba de hipótesis determinó que la utilización de los mapas mentales en la comprensión de los problemas matemáticos tiene una alta incidencia generando empatía y curiosidad en los estudiantes; en un grado menor, los estudiantes reconocen que las uves heurísticas si contribuyen a desarrollar habilidades para plantear un problema y finalmente darle solución

Relationship between internal root resorption and dens in dente

The aim is to report the treatment and follow-up of three lateral incisors with internal root resorption and dens in dente as a possible cause for their development, managed by root canal treatment and apical obturation with MTA or gutta-percha. This case report presents three clinical cases in which dens invaginatus type 2 is shown as a potential cause for the development of internal root resorption. Two cases were filled with a MTA apical plug technique and one with gutta-percha, and all were follow-up through time. The incidence of the association of internal root resorption with dens invaginatus may be underestimated and should be studied

On group strategy-proof mechanisms for a many-to-one matching model

For the many-to-one matching model in which firms have substitutable and quota q-separable preferences over subsets of workers we show that the workers-optimal stable mechanism is group strategy-proof for the workers. In order to prove this result, we also show that under this domain of preferences (which contains the domain of responsive preferences of the college admissions problem) the workers-optimal stable matching is weakly Pareto optimal for the workers and the Blocking Lemma holds as well. We exhibit an example showing that none of these three results remain true if the preferences of firms are substitutable but not quota q-separable.The work of R. Martínez, A. Neme, and J. Oviedo is partially supported by Research Grant 319502 from the Universidad Nacional de San Luis (Argentina). The work of J. Massó is partially supported by Research Grants BEC2002-2130 from the Dirección General de Investigación Científica y Técnica (Spanish Ministry of Science and Technology) and 2001SGR-00162 from the Departament d’Universitats, Recerca i Societat de la Informació (Generalitat de Catalunya)

Re-imagining the Boundaries: Transforming an Annual Reception due to COVID-19

How do you reimagine an over 30-year annual event in the world of COVID-19? Pittsburg State University (PSU) Library Services needed to transform their longest ongoing traditional program, University Authors Reception, in 2020. This event honors authors and creators at PSU by showcasing their publications from the year. Traditionally, this celebration allowed for the honorees and community to engage in discussion about their works, enjoy light refreshments, and celebrate their accomplishments with family and friends. With the uncertainty of COVID-19 and related safety protocols, PSU librarians took the opportunity to reshape elements of the event to ensure a focus on the honorees. In this session, learn how Library Services altered their annual event and what changes will be sustained for future receptions

Crisis económica y devaluación salarial: el caso de España

Con la creación de la Unión Monetaria Europea en el año 1999 y la circulación del Euro como moneda común a partir del año 2002, desaparecen las políticas cambiarias y monetarias como instrumentos de ajuste económico. Aparece la necesidad de encontrar un nuevo mecanismo de ajuste que permita mejorar la competitividad de los productos nacionales para poder alcanzar el equilibrio en la economía. Ese mecanismo es la llamada “devaluación salarial”, la cual ha sido implantada en España con las reformas laborales de los años 2010 y 2012 concretamente.Because of the creation of the European Monetary Union in 1999 and the establishment of the Euro as a common currency since 2002, exchange and monetary policies disappear as intruments of economic adjustment. Since this moment there is a need to find a new economic mechanism that allows improving competitiveness of national products in order to achieve balance in economy. This mechanism is called “wage devaluation”, which has been implementd in Spain with the labor reforms in 2010 and 2012 specificallyDepartamento de Fundamentos del Análisis Económico e Historia e Instituciones EconómicasGrado en Derecho y Grado en Administración y Dirección de Empresa