Two populations are subdivided into two categories of individuals (hawks and doves). Individuals fight to have access to a resource which is necessary for their survival. Conflicts occur between individuals belonging to the same population and to different populations. We investigate the long term effects of the conflicts on the stability of the community. The modelis a set of ODE's with four variables corresponding to hawk and dove individuals of the two populations. Two time scales are considered. A fast time (...) scale is used to describe frequent encounters and fightings between individuals trying to monopolize the resource. A slow time scale is used for the demography and the long term effects of encounters. We use aggregation methods in order to reduce this model into a system of two ODE's only for the total densities of the two populations which is found to be a classical Lotka-Volterra competition model. We study different cases of proportions of hawks and doves in both populations on the global coexistence and the mutal exclusion of the two populations. Pure dove tactics in both populations are unstable. In cases of mixed hawk and dove in both populations, there is coexistence. Pure dove or mixed hawk-dove tactics in one population can coexist with pure hawks in the other one when the costs of fightings between hawks are large enough. (shrink)

As a result of the complexity inherent in some natural systems, mathematical models employed in ecology are often governed by a large number of variables. For instance, in the study of population dynamics we often find multiregional models for structured populations in which individuals are classified regarding their age and their spatial location. Dealing with such structured populations leads to high dimensional models. Moreover, in many instances the dynamics of the system is controlled by processes whose time scales are very (...) different from each other. For example, in multiregional models migration is often a fast process in comparison to the growth of the population.Approximate reduction techniques take advantage of the presence of different time scales in a system to introduce approximations that allow one to transform the original system into a simpler low dimensional system. In this way, the dynamics of the original system can be approximated in terms of that of the reduced system. This work deals with the study of that approximation. In particular, we work with a non-autonomous discrete time model previously presented in the literature and obtain different bounds for the error we incur when we describe the dynamics of the original system in terms of the reduced one. (shrink)

In this work we extend approximate aggregation methods in time discrete linear models to the case of time varying environments. Approximate aggregation consists in describing some features of the dynamics of a general system involving many coupled variables in terms of the dynamics of a reduced system with a few number of variables. We present a time discrete time varying model in which we distinguish two time scales. By using perturbation methods we transform the system to make the global variables (...) appear and build up the aggregated system. The asymptotic relationships between the general and aggregated systems are explored in the cases of a cyclically varying environment and a changing environment in process of stabilization. We show that under quite general conditions the knowledge of the behavior of the aggregated system characterizes that of the general system. The general method is also applied to aggregate a multiregional time dependent Leslie model showing that the aggregated model has demographic rates depending on the equilibrium proportions of individuals in the different patches. (shrink)

The purpose of this work is reviewing some reduction results to deal with systems of nonautonomous ordinary differential equations with two time scales. They could be included among the so-called approximate aggregation methods. The existence of different time scales in a system, together with some long-term features, are used to build up a simpler system governed by a lesser number of state variables. The asymptotic behavior of the latter system is then used to describe the asymptotic behaviour of the former (...) one. The reduction results are stated in two particular but important cases: periodic systems and asymptotically autonomous systems. The reduction results are illustrated with the help of simple spatial SIS epidemic models including either periodic or asymptotically autonomous terms. (shrink)

As the result of the complexity inherent in nature, mathematical models employed in ecology are often governed by a large number of variables. For instance, in the study of population dynamics we often deal with models for structured populations in which individuals are classified regarding their age, size, activity or location, and this structuring of the population leads to high dimensional systems. In many instances, the dynamics of the system is controlled by processes whose time scales are very different from (...) each other. Aggregation techniques take advantage of this situation to build a low dimensional reduced system from which behavior we can approximate the dynamics of the complex original system.In this work we extend aggregation techniques to the case of time dependent discrete population models with two time scales where both the fast and the slow processes are allowed to change at their own characteristic time scale, generalizing the results of previous studies. We propose a non-autonomous model with two time scales, construct an aggregated model and give relationship between the variables governing the original and the reduced systems. We also explore how the properties of strong and weak ergodicity, regarding the capacity of the system to forget initial conditions, of the original system can be studied in terms of the reduced system. (shrink)

In this work we deal with a general class of spatially distributed periodic SIS epidemic models with two time scales. We let susceptible and infected individuals migrate between patches with periodic time dependent migration rates. The existence of two time scales in the system allows to describe certain features of the asymptotic behavior of its solutions with the help of a less dimensional, aggregated, system. We derive global reproduction numbers governing the general spatially distributed nonautonomous system through the aggregated system. (...) We apply this result when the mass action law and the frequency dependent transmission law are considered. Comparing these global reproductive numbers to their non spatially distributed counterparts yields the following: adequate periodic migration rates allow global persistence or eradication of epidemics where locally, in absence of migrations, the contrary is expected. (shrink)

The balance between births and deaths in an age-structured population is strongly influenced by the spatial distribution of sub-populations. Our aim was to describe the demographic process of a fish population in an hierarchical dendritic river network, by taking into account the possible movements of individuals. We tried also to quantify the effect of river network changes (damming or channelling) on the global fish population dynamics. The Salmo trutta life pattern was taken as an example for.We proposed a model which (...) includes the demographic and the migration processes, considering migration fast compared to demography. The population was divided into three age-classes and subdivided into fifteen spatial patches, thus having 45 state variables. Both processes were described by means of constant transfer coefficients, so we were dealing with a linear system of difference equations. The discrete case of the variable aggregation method allowed the study of the system through the dominant elements of a much simpler linear system with only three global variables: the total number of individuals in each age-class. (shrink)

Aggregation of variables allows to approximate a large scale dynamical system (the micro-system) involving many variables into a reduced system (the macro-system) described by a few number of global variables. Approximate aggregation can be performed when different time scales are involved in the dynamics of the micro-system. Perturbation methods enable to approximate the large micro-system by a macro-system going on at a slow time scale. Aggregation has been performed for systems of ordinary differential equations in which time is a continuous (...) variable. In this contribution, we extend aggregation methods to time-discrete models of population dynamics. Time discrete micro-models with two time scales are presented. We use perturbation methods to obtain a slow macro-model. The asymptotic behaviours of the micro and macro-systems are characterized by the main eigenvalues and the associated eigenvectors. We compare the asymptotic behaviours of both systems which are shown to be similar to a certain order. (shrink)

Bravo, F. La dialéctica en Teilhard de Chardin.--Carías, R. El conocimiento de Dios en Max Scheler.--Cappelletti, A. J. El fuego y el logos en la filosofía de Heráclito.--Li Carrillo, V. Estructuralismo y antihumanismo.--Rosales, A. Martín Heidegger y la crisis de la filosofía transcendental.--Rosales, A. La crítica de Heidegger al idealismo moderno.--Rosales, A. El giro del pensamiento de Heidegger.

Abstract:In recent years, Brazilian AIDS activists have faced a growing economic and political crisis that threatens sustainability of the movement and the country's response to the epidemic. Drawing on Michel Foucault's concepts of governmentality and biopolitics, this article offers a multi-stranded genealogy of the Brazilian response to HIV/AIDS to explain the structural fragilities underlying this crisis. Specifically, it traces how a tense constellation of actors, including healthcare reformers, AIDS and sexual rights activists, Brazilian state reformers and the World Bank, came (...) together around a model that has relied heavily on the construction of public-private partnerships and larger policy networks. While these actors' larger visions were often in conflict, their projects partially overlapped around the principles of civil society participation and decentralized administration. Underlying tensions, however, are currently experiencing new pressures, with changes in the regulatory and economic environment and the growing political influence of conservative evangelical sectors. That these shifts are imperiling a model of AIDS prevention long touted as a model for the global South suggests larger implications for AIDS policy and sexual rights activism beyond Brazil. (shrink)

IntroductionIncorporating technology in cognitive interventions represents an innovation, making them more accessible, flexible, and cost-effective. This will not be feasible without adequate user-technology fit. Bearing in mind the importance of developing cognitive interventions whose technology is appropriate for elderly people with cognitive impairment, the objective of this systematic review was to find evidence about usability and user experience measurements and features of stimulation, training, and cognitive rehabilitation technologies for older adults with mild cognitive impairment or dementia.MethodThe Medline, PubMed, Scopus, ScienceDirect, (...) and PsycINFO databases were searched for literature published in the last 10 years, and three researchers independently reviewed potentially eligible studies, following specific inclusion criteria. A systematic review of the studies was conducted, presenting a qualitative synthesis of usability and UX measures with their outcomes, study characteristics and features of the cognitive intervention technologies.ResultsTen studies were selected: five were cognitive stimulation and five were cognitive training. Most of them were computer-based programs with a serious game format. Efficiency and effectiveness were the most frequent measurements used for collecting objective usability data, showing that elderly people with cognitive impairment require more time and help but can complete tasks. Regarding UX or subjective usability data, questionnaires and scales were the most used methods, reporting positive experience despite certain difficulties with the interface in five studies.ConclusionMeasuring usability and UX in cognitive intervention technologies for older adults with MCI or dementia provides an integrated view that can contribute to their development according to the needs and characteristics of the target population. More research is required to include this population group in usability and UX studies, as well as standardized tools and consensus on the relationship of these terms to guarantee the future effectiveness of cognitive intervention technologies.Review registrationThis review was registered in the PROSPERO International Register of Systematic Review Protocols. (shrink)

Childhood obesity, linked to a sedentary lifestyle and an unbalanced diet, is one of the main problems in today’s Western societies. In this sense, the aim of the study was to analyze students’ perceived satisfaction in physical education classes with learning strategies and engagement in learning and critical thinking as determinants of healthy lifestyle habits. The study involved 2,439 high school students aged 12–18 years (M= 14.66,SD= 1.78). Structural equation modeling was conducted to analyze the predictive relationships between the study (...) variables. The results showed that teaching, teaching mastery, and cognitive development are precursors to deep thinking on the part of students, indicators of the adoption of healthy lifestyle habits. These results reflect the importance of the methodology adopted by the teacher in order to positively influence the students’ habits. (shrink)

Background During the first weeks of March 2020 in Spain, the cases of severe respiratory failure progressively increased, generating an imbalance between the clinical needs for advanced life support (ALS) measures and the effective availability of ALS resources. To address this problem, the creation of triage committees (TC) was proposed, whose main function is to select the best candidates to receive ALS. The main objective of our study is to describe the clinical characteristics of the patients evaluated by the TC (...) of the Alcorcón Foundation University Hospital (AFUH) during the first wave of SARS CoV-2. Other objectives are to determine if there are differences between the patients considered candidates / not candidates for ALS and to analyze the functioning of the TC. Methods Retrospective observational study of all patients assessed by the AFUH TC. Results There were 19 meetings, in which 181 patients were evaluated, 65.4% male and with a mean age of 70.1 years. 31% had some degree of functional dependence, the Barthel median was 100 and Charlson 4. 58.5% were not considered a candidate for ALS at that time. The patients considered candidates to receive ALS were younger (72 vs 66; _p_ Conclusions The patients evaluated by the TC had a mean age of 70 years, high comorbidity and almost a third had some degree of functional dependence. More than half were not considered candidates for ALS at that time, these patients being older, with more comorbidity and a worse previous functional situation. TC decisions, based on objective clinical criteria, were almost always respected. Public institutions must get involved in triage procedures, which should and in our opinion must include the creation of TC in health centers. The implementation of Anticipated Decision programs (ADP) would help enable patients affected by triage decisions to participate in them. (shrink)

Este trabajo tiene como objetivo básico analizar las relaciones entre la arqueología, disciplina que se institucionaliza en Japón durante el período Meiji (1868-1912), y el conjunto de relatos definido como “mitología japonesa”. Como se discute en este artículo, la arqueología japonesa estableció desde sus orígenes dos espacios discursivos, uno creado exclusivamente a partir del conocimiento arqueológico, y otro, de carácter mito-histórico, que se apoyaba en las crónicas compiladas por el poder político durante la Antigüedad. Los estudios mitológicos en un sentido (...) estricto surgen en Japón a principios del siglo XX, una época en la que el nuevo Estado Meiji ya había incorporado el relato mítico a la enseñanza de la historia japonesa. Ante el uso político de esta narrativa, la comunidad arqueológica nipona no constituirá un ente monolítico, variando sus reacciones entre el revisionismo, un ferviente colaboracionismo, y el silencio. (shrink)

Este trabajo tiene como objetivo básico analizar las relaciones entre la arqueología, disciplina que se institucionaliza en Japón durante el período Meiji (1868-1912), y el conjunto de relatos definido como “mitología japonesa”. Como se discute en este artículo, la arqueología japonesa estableció desde sus orígenes dos espacios discursivos, uno creado exclusivamente a partir del conocimiento arqueológico, y otro, de carácter mito-histórico, que se apoyaba en las crónicas compiladas por el poder político durante la Antigüedad. Los estudios mitológicos en un sentido (...) estricto surgen en Japón a principios del siglo XX, una época en la que el nuevo Estado Meiji ya había incorporado el relato mítico a la enseñanza de la historia japonesa. Ante el uso político de esta narrativa, la comunidad arqueológica nipona no constituirá un ente monolítico, variando sus reacciones entre el revisionismo, un ferviente colaboracionismo, y el silencio. (shrink)

Resumen: Este artículo tiene como objetivo ofrecer al lector un análisis de las figuras antropomorfas conocidas como dogū, que fueron elaboradas durante el período Jōmon de la prehistoria japonesa. Para ello, en primer lugar, será necesario esclarecer sus orígenes y evolución a partir del conocimiento arqueológico acumulado hasta la actualidad, que pondrá de relieve un proceso gradual de complejización tipológica, desde formas primarías hasta un intento de trascender la representación del cuerpo humano. Al mismo tiempo, también se deberá prestar atención (...) a su diversidad sincrónica, marcada por diferentes tipos con una mayor o menor presencia en el marco espacial del archipiélago. Esta labor permitirá no sólo delimitar las diferentes etapas protagonizadas por estas figuras, sino también esclarecer su posible significado y uso. Ello nos conducirá finalmente a un replanteamiento sobre la propia existencia de los dogū como categoría arqueológica. (shrink)

La réflexion sur l’interprétation peut être l’objet de deux historiographies parallèles et parfois concurrentes : l’une – dite longue – s'étend jusqu’à l’Antiquité, aux premières sources de la tradition juive d’études sur « le Livre » et au Peri Hermêneias d’Aristote ; l’autre – dite courte – remonte au XVIIIe siècle, quand l’École de Göttingen (Heyne, Wolf, Schlegel, parmi d’autres) construit les bases philologiques, historiques et linguistiques de la réflexion philosophique de Schleiermache...

La escritura académica es esencial en la formación universitaria, pero también representa un desafío, ya que los niveles de escritura no siempre son óptimos. Esta investigación describe las percepciones de los estudiantes sobre la escritura académica. Se empleó un enfoque descriptivo no experimental de tipo transversal, aplicando el Cuestionario de Percepción sobre Alfabetización Académica a 295 estudiantes en tres programas universitarios: Educación, Literatura y Lingüística, y Psicología. Los resultados reflejan una apreciación positiva de su competencia comunicativa, considerando que los conocimientos (...) adquiridos han mejorado su proceso de escritura y la identificación de diversos géneros. Al mismo tiempo, reconocen la necesidad de profundizar en las estrategias de escritura. (shrink)

En este artículo ofrecemos la historia de Magisterio de “Santa Ana”, erigida en 1962 en el colegio de San Ana de Sevilla y fusionada con la del “Cardenal Spínola” de las Esclavas del Divino Corazón y con la de “San Rafael” de los Salesianos. La primera parte, escrita por los profesores Holgado Barroso y Márquez de la Plata, está dedicada al estudio de la creación de las Escuelas de Magisterio de la Iglesia, a la ley de educación primaria de (...) 1945 y al plan de estudios de 1950. En la segunda parte, el profesor Martín Riego nos ofrece una visión histórica de la Escuela de Magisterio de “Santa Ana”: creación de la misma, edificio, profesores, alumnos, etc. (shrink)

El objeto de esta investigación es tratar del nacimiento, crecimiento y plenitud de las relaciones amorosas en la obra de Ibn Hazm de Córdoba. La hipótesis que lo guía es que en Ibn Hazm se da una articulación entre ἔρως y voluntad electiva sin la cual el dinamismo amoroso no llega a su fin. Las investigaciones hasta la fecha subrayan aspectos algunos aspectos del platonismo de Ibn Hazm como el poder elevante del amor y su fuerza unitiva, pero no suelen (...) caracterizar metafísicamente el eros y desatienden el momento reflexivo y unitivo, que sin embargo es necesario para Ibn Hazm dada la intención ética que preside El collar de la paloma. (shrink)

La jurisdicción constitucional nació el 24 de febrero de 1803 en una desangelada sala en la planta baja del Capitolio cedida por el Congreso de los Estados Unidos al Tribunal Supremo cuando su presidente, el Chief Justice John Marshall hizo pública la sentencia en el caso Marbury v. Madison. En ella se establecía la revisión judicial de las leyes (y también de los actos del Gobierno, pero éste es otro tema) sacándosela de la manga de la toga como de una (...) chistera extraen un conejo los prestidigitadores, pues la Constitución del nuevo país, promulgada en 1787 y todavía vigente, no preveía expresamente tal competencia. (shrink)

En su exposición Marcelo Boeri aborda el problema de la “utopía” política de Platón a partir de una reconstrucción argumentativa según la cual el significado del “ser posible” de la “ciudad ideal” descrita en la República puede ser comprendido a partir del recurso a la relación entre el paradigma y su copia. Sin embargo, la siguiente consideración, no se centrará en una evaluación de esta estrategia hermenéutica, sino, más bien, en ciertas suposiciones y afirmaciones que resultan difícilmente aceptables o, al (...) menos, muy discutibles. Esto es importante, puesto que, en cierto modo, el enfoque total del problema pierde claridad. (shrink)

Dentro del contexto histórico de la sociedad tecnológica parece urgente considerar los alcances insólitos y los problemas éticos que suscita la provocación técnica actual, los cuales mueven a poner en cuestión la provocación productiva que el hombre ejerce respecto de la naturaleza. Sin embargo antes de tal cuestionamiento es necesario encontrar una vía de acceso a la esencia originaria de la técnica. Este artículo propone un camino de comprensión de la técnica a partir del sentido de la ποíησις según el (...) pensamiento de Platón, en cuyo “Banquete” puede extraerse cómo la τέχνη, en vez de ejercer una producción provocante, depende ella misma de la provocación de la naturaleza. According to the historical context of technological society, it seems urgent to consider the unusual scope and the ethical issues raised by the present technological provocation, which lead to questioning the productive provocation which man exerts over nature. Nevertheless before such questioning takes place, it is necessary to access the primary essence of technique. This paper sets a path for the comprehension of technique starting from the meaning of ποíησις based on Plato’s ideas. In his work "Symposium", technique emerges as τέχνη, which instead of exerting a provocative production, depends on the provocation of nature. (shrink)

RESUMEN Este artículo pretende comprender la filosofía de Platón como un ejercicio esencialmente político. Esto implica, sin embargo, distinguir cómo se ejerce esta filosofía política, su sentido y alcance. Muchos estudiosos han atribuido a Platón el proyecto político que Sócrates desarrolla en la República. Sin embargo, el símil de la caverna da cuenta de la imposibilidad o, al menos, de la interna problematicidad de tal proyecto, por lo cual se sugiere que no es en el diálogo República donde se encontraría (...) la auténtica filosofía política de Platón, sino en los denominados diálogos aporéticos. En estos diálogos no se habla sobre una posible ciudad, sino que se ejercita de manera viva una política desarrollada por la dialéctica terapéutica de Sócrates, cuya tarea es desvelar la virtud mediante el desenmascaramiento de los rostros de la ciudad. ABSTRACT The following paper contends that Plato's philosophy is essentially a political activity. This imply, however, to distinguish how this political philosophy carries out, its meaning and scope. Many scholars have attributed to Plato the political project, which Socrates develops in the dialogue Republic. Nevertheless, the simile of the cave reveals the impossibility of such a project or, at least, the serious problems that lie behind it. So, I suggest, that is not in the dialogue Republic where it finds Plato's authentic political philosophy, but in the so-called aporetic dialogues. In these dialogues it does not discuss about a possible city, but it exercises in a lively way a politics builted by Socrates' dialectic therapy, whose task is unveiling the virtue through the unmasking the faces of the city. (shrink)

RESUMEN La poesía de William Wordsworth pasaba por ser, entre muchos de sus comentaristas contemporáneos, una poesía pensante. Ya sea que se hablase de un sentido edificante de su poesía, de una perspectiva refrescante acerca de las cosas cotidianas o bien de un pensamiento filosófico, la poesía de Wordsworth siempre fue considerada como un notable esfuerzo por elevar el poema a una categoría ontológica. Dentro de este contexto, la imaginación cobra una gran importancia. Se analiza en qué sentido la imaginación (...) es el centro ontológico de la poesía de Wordsworth. ABSTRACT William Wordsworth's poetry was a thinking poetry, according to many of his contemporaries. Whether it was due to the edifying nature of his poetry, his refreshing approach to everyday things, or his philosophical thought, Wordsworth's poetry was always considered as a notable effort to elevate the poem to ontological category. In this context, imagination acquires great importance. The article analyzes the sense in which imagination is the ontological center of Wordsworth's poetry. RESUMO A poesia de William Wordsworth passava por ser, entre muitos de seus comentaristas contemporâneos, uma poesia pensante. Seja porque se falava de um sentido edificante de sua poesia, de uma perspectiva refrescante sobre as coisas cotidianas, seja porque se falava de um pensamento filosófico, a poesia de Wordsworth sempre foi considerada como um notável esforço por elevar o poema a uma categoria ontológica. Dentro desse contexto, a imaginação ganha uma grande importância. Analisa-se em que sentido a imaginação é o centro ontológico da poesia de Wordsworth. (shrink)

RESUMEN: Este trabajo considera la conceptualización y aplicación de la figura de los ajustes razonables en Qatar tras nueve años desde la ratificación de la Convención sobre los Derechos de las Personas con Discapacidad (CDPD). En él se trata de analizar la situación de igualdad y no discriminación de las personas con discapacidad utilizando como medida de impacto la figura de ajustes razonables. El artículo destaca las principales fallas y virtudes del Estado de Qatar respecto a esta figura y traza (...) un camino a fin de poder avanzar en la inclusión de las personas con discapacidad a la luz de la CDPD. ABSTRACT: This paper considers the conceptualization and application of reasonable acommodation in Qatar after nine years since the ratification of the Convention on the Rights of Persons with Disabilities (CRPD). It analyzes the situation of equality and non-discrimination of people with disabilities using the figure of reasonable adjustments as an impact measure. The article highlights the main failures and virtues of the State of Qatar regarding reasonable accommodation and draws a path to move forward in the inclusion of people with disabilities in the light of the CRPD. PALABRAS CLAVE: ajustes razonables, igualdad, CDPD, Qatar. KEYWORDS: reasonable accommodation, equality, CRPD, Qatar. (shrink)

En este trabajo se destaca el papel de la accesibilidad en el discurso de los derechos humanos. Para ello se expone su significado general tomando como referencia el diseño universal, en sus tres sentidos, y los ajustes razonables. El trabajo describe las diferentes construcciones jurídicas de la accesibilidad y sus límites.

El Patronato de Misiones Pedagógicas desarrolló una importante labor de recuperación y difusión de la cultura musical, especialmente del folklore musical español, en los primeros años de la II República española, al poner en marcha un servicio de música y un coro que se encargaron de acercar diferentes estilos y géneros musicales a los habitantes de las zonas rurales más deprimidas. En este artículo se presenta un estudio documental sobre el trabajo llevado a cabo por los integrantes del coro y (...) por las personas que se encargaron de custodiar los recursos musicales cedidos por el Patronato y de programar las diferentes actividades musicales en los municipios que gozaron de dichos recursos. A su vez, se recogen diversos testimonios que dan fe del cometido realizado por esta institución y del impacto cultural y musical que supuso en los habitantes de las localidades donde se desarrollaron las diferentes actividades misionales. (shrink)

This work will examine the main issues generated in the discussion about social justice, freedom and equality from a Marxist and egalitarian liberalism perspective, which would require an answer if the search for a good society continues. Since the world’s economic, social, political and cultural situation has changed in the last decades, nowadays the necessary ethic-political foundations for a fair and free social order must be discussed. The problem is to clarify, in the light of political philosophy and human sciences, (...) the proposals made about such social order and for the current moment, and from the socialist and egalitarian liberal theories with thinkers such as Marx, Cohen and Roemer, for the first, and Rawls, Dworkin Nagel and Sen, for the second, among others. The purpose of this work is mainly didactic and deals with a description of situations such as poverty, exclusion and social inequality that the world lives in. It also deals with the authors’ proposals about such topics, analyzing if there is incompatibility between the capitalist institutions and the socialist project for the achievement of these ideals/values that give origin to the title. (shrink)