Variaciones de nitrógeno liviano y nitratos producidos por los distintos manejos del cultivo de maíz en suelos argiudoles

p.335-343En suelos argiudoles de la provincia de Buenos Aires, se realizaron distintos ensayos para cuantificar el ritmo de mineralización del nitrógeno liviano y la producción de nitratos obtenida. Las variables usadas fueron diferentes manejos sobre un cultivo de maíz, sistemas de labranza y fertilización. El orden de la mineralización del nitrógeno liviano al finalizar el ciclo vegetal sigue la tendencia general de arada con cincel menos que arada con reja y ésta menos que arada de desfonde. En nitratos se evidencia un comportamiento similar en los diferentes manejos y lugares, con máximos de producción en septiembre-octubre y bruscas disminuciones en diciembre. El agregado de fertilizante (UREA) tiene influencia disminuyendo la mineralización de nitrógeno liviano y aumentando la producción de nitratos

Cooperation on capacitated inventory situations with fixed holding costs

[Abstract] In this paper we analyze a situation in which several firms deal with inventory problems concerning the same type of product. We consider that each firm uses its limited capacity warehouse for storing purposes and that it faces an economic order quantity model where storage costs are irrelevant (and assumed to be zero) and shortages are allowed. In this setting, we show that firms can save costs by placing joint orders and obtain an optimal order policy for the firms. Besides, we identify an associated class of costs games which we show to be concave. Finally, we introduce and study a rule to share the costs among the firms which provides core allocations and can be easily computed.Ministerio de Ciencia e Innovación; MTM2011-23205Galicia. Consellería de Economía e Industria; INCITE09-207-064-PRComunidad Valenciana. Generalidad; ACOMP/2014Ministerio de Ciencia e Innovación; MTM2011-27731-C0

Evaluating the impact of items and cooperation in inventory models with exemptable ordering costs

[Absctract]: In this paper we introduce and analyse, from a game theoretical perspective, several multi-agent or multi-item continuous review inventory models in which the buyers are exempted from ordering costs if the price of their orders is greater than or equal to a certain amount. For all models we obtain the optimal ordering policy. We first analyse a simple model with one firm and one item. Then, we study a model with one firm and several items, for which we design a procedure based on cooperative game theory to evaluate the impact of each item on the total cost. Then, we deal with a model with several firms and one item for each firm, for which we characterise a rule to allocate the total cost among the firms in a coalitionally stable way. Finally, we discuss a model with several firms and several items, for which we characterise a rule to allocate the total cost among the firms in a coalitionally stable way and to evaluate the impact of each item on the cost that would be payable to each firm when using the allocation rule. All the concepts and results of this article are illustrated using data from a case study.This work is part of the R+D+I project grants MTM2017-87197-C3-1-P, MTM2017-87197-C3-2-P, PGC2018-097965-B-I00, PID2021-124030NB-C31, PID2021-124030NB-C33 and PID2022-137211NB-100, that were funded by MCIN/AEI/10.13039/501100011033/ and by “ERDF A way of making Europe”/EU. This research was also funded by project PROMETEO/2021/063 from the Comunidad Valenciana, and by Grupos de Referencia Competitiva ED431C-2020/03 and ED431C-2020/14 from the Consellería de Cultura, Educación e Universidades, Xunta de Galicia. Funding for open access charge: Universidade da Coruña/CISUG . The authors would also like to thank the anonymous reviewers for their comments, which have contributed to the improvement of this article.Xunta de Galicia; ED431C-2020/03Xunta de Galicia; ED431C-2020/14Generalitat Valenciana; PROMETEO/2021/06

On benefits of cooperation under strategic power

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https:// doi.org/10.1007/s10479-019-03495-6[Abstract]: We introduce a new model involving TU-games and exogenous structures. Specifically, we consider that each player in a population can choose an element in a strategy set and that, for every possible strategy profile, a TU-game is associated with the population. This is what we call a TU-game with strategies. We propose and characterize the maxmin procedure to map every game with strategies to a TU-game. We also study whether or not the relevant properties of TU-games are transmitted by applying the maxmin procedure. Finally, we examine two relevant classes of TU-games with strategies: airport and simple games with strategies.The authors would like to thank two anonymous referees for their helpful suggestions to improve this article. This work has been supported by the Ministerio de Economía y Competitividad through Grants PGC2018-097965-B-100, MTM2017-87197-C3-1-P, MTM2017-87197-C3-2-P, MTM2014-53395-C3-1-P, MTM2014-53395-C3-3-P, MTM2014-54199-P, and by the Xunta de Galicia through the European Regional Development Fund (Grupos de Referencia Competitiva ED431C-2016-015 and ED431C-2016-040, and Centro Singular de Investigación de Galicia ED431G/01).Xunta de Galicia; ED431C-2016-015Xunta de Galicia; ED431C-2016-040Xunta de Galicia; ED431G/0

Determinación de nitrógeno en las fracciones livianas de los complejos orgánico minerales de los suelos

p.1-6Se describe un método, para la determinación de Nitrógeno en las fracciones livianas de los complejos orgánico-minerales, con sensibilidad y precisión adecuados para la parte superficial del suelo. El mismo consiste en el fraccionamiento densimétrico de los complejos con una mezcla de bromoformoetanol de densidad igual a 2, y la cuantificación del Nitrógeno liviano por la técnica de Micro-Kjeldahl. Dado que el procedimiento es relativamente simple se aplicó a una red de ensayos de trigo, presentando correlación significativa con rendimiento en algunos años, teniendo en otros una tendencia positiva. Comparativamente, manifestó ser el método diagnóstico de mayor homogeneidad en las distintas zonas y años estudiados

Desarrollo de proyectos didácticos para adquirir competencias transversales

Resumen de los autoresUniversidad de La CoruñaEl Espacio Europeo de Enseñanza Superior (EEES) ha conducido a la búsqueda e implantación de nuevas metodologías docentes que permitan garantizar la adquisición de competencias propias de cada titulación, así como competencias transversales y transferibles. En este trabajo presentaremos nuestra experiencia sobre la utilización de proyectos en varias titulaciones de Grado y de Máster de titulaciones de Ingeniería. La experiencia gira en torno a la realización de pequeños proyectos que fomentan la colaboración, la expresión oral y otras competencias transversales.ES

Goethite-based carbon foam nanocomposites for concurrently immobilizing arsenic and metals in polluted soils

Although different amendments have been used for the immobilization of metals and metalloids in contaminated soils, in most of them there are still important challenges that need to be faced in order to achieve an optimal result. In this work, a new material based on a carbon foam impregnated with goethite nanoneedles has been developed with the aim of evaluating its effect on the mobility and availability of As, Cd, Cu, Pb and Zn in an industrial soil. For this purpose, leaching, sequential extraction and phytotoxicity studies have been carried out. The results were compared with the same carbon foam without goethite impregnation. When the soil was treated with goethite-based carbon foam nanocomposite, the mobility of metal(loid)s was markedly reduced, with the exception of Zn, which showed moderate immobilization. The presence of acid groups on the surface of the carbon foam, together with a high surface area, led to a strong immobilization of pollutants. Moreover, the modification of the foams using goethite nanoneedles, imply that the novel nanocomposite obtained is effective to remediate simultaneously metal and metalloid-polluted soils, without any relevant effect on soil toxicity.This work was funded by the research projects MCI-20-PID2019-106939 GB-I00 (AEI/Spain, FEDER/EU) and I + D + i PID 2020-113558RB-C43 (MCIN/AEI/10.13039/501100011033). The authors acknowledge the Spanish Research Council (CSIC) for the JAE-Intro fellowship awarded to Iria Janeiro Tato (Ref.: JAEICU-19-INCAR-9).Peer reviewe

Overexpression of corticotropin-releasing factor in intestinal mucosal eosinophils is associated with clinical severity in Diarrhea-Predominant Irritable Bowel Syndrome

Corticotropin-releasing factor (CRF) has been identified in intestinal mucosal eosinophils and associated with psychological stress and gut dysfunction. Irritable bowel syndrome (IBS) is commonly characterized by altered intestinal motility, immune activation, and increased gut barrier permeability along with heightened susceptibility to psychosocial stress. Despite intensive research, the role of mucosal eosinophils in stress-associated gut dysfunction remains uncertain. In this study, we evaluated eosinophil activation profile and CRF content in the jejunal mucosa of diarrhea-predominant IBS (IBS-D) and healthy controls (HC) by gene/protein expression and transmission electron microscopy. We also explored the association between intestinal eosinophil CRF and chronic stress, and the potential mechanisms underlying the stress response by assessing eosinophil response to neuropeptides. We found that mucosal eosinophils displayed higher degranulation profile in IBS-D as compared to HC, with increased content of CRF in the cytoplasmic granules, which significantly correlated with IBS clinical severity, life stress background and depression. Eosinophils responded to substance P and carbachol by increasing secretory activity and CRF synthesis and release, without promoting pro-inflammatory activity, a profile similar to that found in mucosal eosinophils from IBS-D. Collectively, our results suggest that intestinal mucosal eosinophils are potential contributors to stress-mediated gut dysfunction through CRF production and releas

Cuadernos sobre salud y buen trato a la infancia y adolescencia en Andalucía

Publicado en la plataforma de la Red Sabia (Red de Salud y Buen Trato a la Infancia y la Adolescencia. http://www.redsabia.org/) de la Consejería de Igualdad, Salud y Políticas SocialesContiene: Cuaderno I: Intervención Integral desde salud ante el maltrato infantil. Enfoque de derechos de la Infancia; y, Cuaderno II: ¿Qué deben saber quienes trabajan en el sistema sanitario sobre el maltrato infantil?YesEstos cuadernos de trabajo sobre salud y buen arato a la infancia en Andalucía tienen por objetivo aportar un enfoque, un método de trabajo y unos instrumentos para mejorar y reforzar la reflexión y la práctica profesional relacionada con la prevención del maltrato infantil y la promoción del buen trato en la atención sanitaria a los niños, niñas y adolescentes, así como un tratamiento integral y de calidad a las víctimas infantiles de cualquier forma de violencia ejercida sobre ellos, siempre en colaboración con aquellas otras instituciones que configuran el sistema de atención a la infancia en Andalucía