315 research outputs found

    Lecture room web for the improvement of mathematic knowedge

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    In this work it is detailed a proposal that a group of lecturers belonging to the investigation group of the Universidad Politécnica de Madrid (UPM) “Mathematics applied to Civil Engineering: MAIC” is accomplishing through a project of educative innovation financed by the UPM. It is proposed a “Mathematic Thinking Lecture Room” to be incorporated in the web pages of the universities. It is offered in it a series of activities which permit the training of the students in several transversal competences, most of them related to the mathematical thinking, and others that, although can seem far from it, it is possible to develop them together. The list of activities proposed for this `lecture roomweb´ that can be increased with others along the beginning of it is: • Games, pastimes and mathematical puzzles. • The mathematical language: prove and solve. • Training for the mathematical Olympiads. • Activities related to the mathematical thinking: readings with mathematical content, mathematical cinema... • Convocation of competitions: mathematical short stories, mathematical photography, mathematical short films... • Forums and open discussions

    Implementación de un algoritmo de búsqueda de posiciones de equilibrio ponderado

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    En esta ponencia se presenta un algoritmo que determina las posiciones de equilibrio en un juego de competición política entre dos partidos representados en el plano de políticas por dos puntos. Para modelar una situación que se ajuste lo más posible a la realidad política de los diferentes países, se considera que los votantes están distribuidos en tipos posicionados en el plano por puntos que representan sus preferencias políticas y que dichos tipos no están equidistribuidos (se les asigna un peso). El estudio teórico de la existencia y unicidad de posiciones de equilibrio en el sentido clásico de Nash se hace aplicando herramientas geométricas como son los cierres convexos. El algoritmo de búsqueda de dichas posiciones de equilibrio cuando existen, se implementa en un caso práctico de la política en España, basado en el estudio 2742 (BARÓMETRO NOVIEMBRE 2007) realizado por el CIS

    Platelet-Rich Plasma Peptides: Key for Regeneration

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    Platelet-derived Growth Factors (GFs) are biologically active peptides that enhance tissue repair mechanisms such as angiogenesis, extracellular matrix remodeling, and cellular effects as stem cells recruitment, chemotaxis, cell proliferation, and differentiation. Platelet-rich plasma (PRP) is used in a variety of clinical applications, based on the premise that higher GF content should promote better healing. Platelet derivatives represent a promising therapeutic modality, offering opportunities for treatment of wounds, ulcers, soft-tissue injuries, and various other applications in cell therapy. PRP can be combined with cell-based therapies such as adipose-derived stem cells, regenerative cell therapy, and transfer factors therapy. This paper describes the biological background of the platelet-derived substances and their potential use in regenerative medicine

    Approach to the potential production of giant reed in surplus saline lands of Spain

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    Growing energy crops on marginal land has been promoted as a way of ensuring that biomass production involves an acceptable and sustainable use of land. Saline and saline-prone agricultural lands represent an opportunity for growing energy crops avoiding the displacement of food production and contributing to restoration of degraded land. Giant reed (Arundo donax L.) is a perennial grass that has been proposed as a promising energy crop for lignocellulosic biomass production while its tolerance to salinity has been proved. In this work, the identification of surplus saline lands that could be irrigated with saline waters for growing tolerant-energy crops (giant reed) in the mainland of Spain and the assessment of the agronomically attainable yield in these limiting growing conditions were undertaken. To this purpose, a GIS analysis was conducted using geodatabases related to saline areas, agro-climatic conditions, irrigation water requirements, agricultural land availability, restrictions regarding the range of electrical conductivity tolerated by the crop, competition with agro-food crops and irrigation water provisions. According to the approach developed, the irrigated and saline agricultural area available and suitable for biomass production from giant reed amounted up to 34 412 ha. The agronomically attainable yield in these limiting conditions was estimated at 12.7 – 22.2 t dm ha−1 yr−1 and the potential production of lignocellulosic biomass, 597 338 t dm yr−1. The methodology followed in this study can be applied to other target regions; it allows the identification of this type of marginal lands, where salinity-tolerant plant species could be grown for bioenergy purposes, avoiding competition with agro-food crops, and where soil restoration measurements should be undertaken

    Search algorithm to find optimum strategies to shape political action with subjective assessment

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    This paper introduces a problem related to decision making and the shaping of political strategies in the course of one term of office, in which the government and the opposition shape their proposals for action on two issues that are relevant for the citizens. A variable component is considered regarding both the relevance of the issues to be dealt with and the strategies that the parties are presumed to adopt. The aim of this study is to find the optimum strategies for the two majority parties of a country, while allowing them to vary their proposals to a certain degree. In addition, the process is dynamic because the proposals are intended to be modified taking into account the other party’s foreseen action. The contribution of this article lies in this approach, as well as in its taking into account variable components. The problem is dealt with from a geometric point of view, and a search algorithm to find optimum strategies is developed

    Potential vasorelaxant effects of oleanolic acid and erythrodiol, two triterpenoids contained in 'orujo' olive oil, on rat aorta

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    Orujo' olive oil is obtained by chemical processes from the waste resulting from the mechanical extraction of virgin olive oil. The aim of the present study was to evaluate a new pharmacological property of two natural triterpenoids contained in olive oil, as vasodilatory agents, and to determine their mechanism of action. The two compounds studied were oleanolic acid and erythrodiol. The vasorelaxant effect induced by these pentacyclic triterpenoids was studied in isolated thoracic rat aorta. Oleanolic acid and erythrodiol, accumulatively added, showed vasorelaxant activities in aortic rings with endothelium pre-contracted by 10-6 M-phenylephrine (maximum percentage of relaxation 86.38 (SEM 2.89) and 73.53 (SEM 6.01), respectively). They had almost no relaxant effect on depolarised or endothelium-denuded aortic segments. The relaxation was significantly attenuated by pre-treatment with the NO synthase inhibitor Nω -nitro-L-argi-nine-methylester (L-NAME; 3 × 10-4 M). To characterise the involvement of endothelial factors, in addifion to NO, arteries with endothelium were exposed to 10-5 M-indomethacin (INDO), a cyclo-oxygenase inhibitor, or INDO plus L-NAME. INDO did not have any significant effect on the relaxant response of both compounds. The combination of L-NAME plus INDO only abolished the oleanolic acid-induced relaxation. The present results suggest that the mechanism of relaxation seems to be mainly mediated by the endothelial production of NO; however, other mechanisms cannot be excluded. It can be concluded that oleanolic acid and erythrodiol may have interesting therapeutic potential as new vasodilator drugs, thus protecting the cardiovascular system. Therefore, the intake of 'orujo' olive oil, as a source of these compounds, might be beneficial in this regard.Comisión Interministerial de Ciencia y Tecnología AGL2002-00195Junta de Andalucía CAO01-00

    Algoritmos de gestión de personal enfocados a la mejora del servicio al cliente. Aplicación a servicios de urgencias de atención primaria

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    En el presente artículo se desarrolla una metodología de planificación y organización de recursos en el contexto de las urgencias de un centro de salud que puede ser extrapolada a otro tipo de servicios. Dicha metodología desemboca en la realización de un programa de ordenador que resuelve de forma efectiva ciertas tareas de planificación. Planificar los servicios de urgencias de atención primaria (SUAP) para que mejoren su calidad y sean atrayentes para los pacientes puede descongestionar las urgencias hospitalarias incidiendo de manera integral en todo el servicio de urgencias sanitario. El tiempo de espera reducido es el principal factor que los usuarios identifican con la calidad del servicio, por ello actuar sobre este elemento supone una opción para lograr este fin. Se presenta el desarrollo de un algoritmo que, teniendo como objetivo no sobrepasar un tiempo de espera prefijado en un SUAP, obtenga como respuesta la distribución de personal a asignar optimizando además el consumo de recursos. Adicionalmente, se aporta un segundo desarrollo computacional que transforma la asignación teórica de personal anterior en otra que sea fácilmente aplicable en la práctica por los gestores de los servicios. De esta forma, se ha desarrollado un programa que calcula el número de facultativos necesarios en un SUAP, una vez que se ha fijado el tiempo máximo de espera deseable en dicho servicio. El programa constituye un instrumento de gestión y planificación del número de médicos y su actividad en un SUAP, dependiendo de los tiempos de espera deseados, que se adapta a las características dinámicas y cambiantes que dichos servicios presentan por su naturaleza, siendo de aplicación en un amplio abanico de sectores productivos. This paper presents a methodology for planning and organizing resources in the context of a medical clinic emergency. This methodology can be applied to other type of services and is implemented in software that effectively solves the planning of certain tasks. Planning the primary attention emergency services (to improve their quality and to be attractive for patients) can clear the hospital emergency rooms, influencing in an integral way the whole sanitary emergency service. The hospital emergency services receive a considerable proportion of patients who should be assisted in the emergency services for primary attention. A reduced wait time is the main factor that patients identify with quality of service. Therefore, optimizing this element is an option to reach this aim. This has led to the development of an algorithm which aims to not exceed a prearranged wait time in the emergency services of primary attention, and gets as a response the distribution of personnel to be assigned to optimize the consumption of resources. Additionally, it is given a second computational development which transforms the previous theoretical assignment of personnel into another one that is easily applicable in practice by the agents of the services. It has developed a plan that calculates the number of doctors needed in an emergency service of primary attention, once the maximum wait time desired of this service has been determined. The plan is a tool for the management and planning of the number of doctors and their activity in an emergency service of primary attention, depending on the desired wait time, which adapts to the dynamic and changing features which these services present due to their application in a wide variety of production sectors

    Geometric Study of the Weak Equilibrium in a Weighted Case for a Two-Dimensional Competition Game

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    In this work, an improvement of the results presented by [1] Abellanas et al. (Weak Equilibrium in a Spatial Model. International Journal of Game Theory, 40(3), 449-459) is discussed. Concretely, this paper investigates an abstract game of competition between two players that want to earn the maximum number of points from a finite set of points in the plane. It is assumed that the distribution of these points is not uniform, so an appropriate weight to each position is assigned. A definition of equilibrium which is weaker than the classical one is included in order to avoid the uniqueness of the equilibrium position typical of the Nash equilibrium in these kinds of games. The existence of this approximated equilibrium in the game is analyzed by means of computational geometry techniques

    Algoritmos de gestión de personal enfocados a la mejora del servicio al cliente. Aplicación a servicios de urgencias de atención primaria

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    En el presente artículo se desarrolla una metodología de planificación y organización de recursos en el contexto de las urgencias de un centro de salud que puede ser extrapolada a otro tipo de servicios. Dicha metodología desemboca en la realización de un programa de ordenador que resuelve de forma efectiva ciertas tareas de planificación. Planificar los servicios de urgencias de atención primaria (SUAP) para que mejoren su calidad y sean atrayentes para los pacientes puede descongestionar las urgencias hospitalarias incidiendo de manera integral en todo el servicio de urgencias sanitario. El tiempo de espera reducido es el principal factor que los usuarios identifican con la calidad del servicio, por ello actuar sobre este elemento supone una opción para lograr este fin. Se presenta el desarrollo de un algoritmo que, teniendo como objetivo no sobrepasar un tiempo de espera prefijado en un SUAP, obtenga como respuesta la distribución de personal a asignar optimizando además el consumo de recursos. Adicionalmente, se aporta un segundo desarrollo computacional que transforma la asignación teórica de personal anterior en otra que sea fácilmente aplicable en la práctica por los gestores de los servicios. De esta forma, se ha desarrollado un programa que calcula el número de facultativos necesarios en un SUAP, una vez que se ha fijado el tiempo máximo de espera deseable en dicho servicio. El programa constituye un instrumento de gestión y planificación del número de médicos y su actividad en un SUAP, dependiendo de los tiempos de espera deseados, que se adapta a las características dinámicas y cambiantes que dichos servicios presentan por su naturaleza, siendo de aplicación en un amplio abanico de sectores productivos. This paper presents a methodology for planning and organizing resources in the context of a medical clinic emergency. This methodology can be applied to other type of services and is implemented in software that effectively solves the planning of certain tasks. Planning the primary attention emergency services (to improve their quality and to be attractive for patients) can clear the hospital emergency rooms, influencing in an integral way the whole sanitary emergency service. The hospital emergency services receive a considerable proportion of patients who should be assisted in the emergency services for primary attention. A reduced wait time is the main factor that patients identify with quality of service. Therefore, optimizing this element is an option to reach this aim. This has led to the development of an algorithm which aims to not exceed a prearranged wait time in the emergency services of primary attention, and gets as a response the distribution of personnel to be assigned to optimize the consumption of resources. Additionally, it is given a second computational development which transforms the previous theoretical assignment of personnel into another one that is easily applicable in practice by the agents of the services. It has developed a plan that calculates the number of doctors needed in an emergency service of primary attention, once the maximum wait time desired of this service has been determined. The plan is a tool for the management and planning of the number of doctors and their activity in an emergency service of primary attention, depending on the desired wait time, which adapts to the dynamic and changing features which these services present due to their application in a wide variety of production sectors
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