947 resultados para BARRIOS MARGINADOS


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After considering museums as cultural institutions responsible for preserving cultural memory and its evolution over time, this article describes the cultural practices within our society that are aimed at disseminating art and at reproducing and transmitting culture, history and identity. Further, it considers the key role that older people are steadily assuming in Spain’s ageing society. New social-empowerment activities based on volunteering by the elderly are linked to generativity because the individual and social groups acquire new skills through those activities, thereby strengthening a society for all ages. Never in the history of social work have so many older people been prepared to participate actively at the community level, and never has a social movement with these features gone so unnoticed by so many social agents.

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In the framework of the European project Platform of Local Authorities and Communicators Engaged in Science (PLACES), we analyse the articulations between scientifi c communication, public perception of science, processes of citizen participation and apropiation of space, based on a case study of the inhabitants of Teruel city, Autonomous Community of Aragon, Spain. On the interrelationships between these issues, there are a number of contradictions, such as the difference between a high interest for information about science and technology and a low level of recognition and interaction with local institutions involved in those activities, the complex conceptualization of scientifi c space in relation to the “public-private” pair, or an articulation of a claiming civic rethoric and an insuffi cient co-responsibility. We conclude that, in a local context, the dimension of territoriality and, in particular, the identifi cation with the town, is a central mediation for activating citizen participation as part of processes of appropriation of space for setting up cities of scientifi c culture.

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Contribution of co-operatives has been demonstrated since the 1970s as the main development line in agricultural production in Cuba. In contrast, there has been a late recognition of urban co-operatives, even if the need of transformations based on the realization of property in different territorial scenarios had been identified. The article analyses the reform processes launched since the first decade of the 21st century focusing on the nature of the initiatives fostering formation and promotion of nonagricultural co-operatives including follow up of their performance. The potential and limitations of the recent experiences are examined in order to reflect on the organizational processes and transformations from the point of view of their members. To conclude, some questions are posed about whether these co-operatives are capable of avoiding the impact of earlier employment circumstances and of developing strategies aimed at reinforcing voluntary membership and autonomy on which they are founded.

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En este artículo presentamos los resultados y el análisis de uno de los objetivos del proyecto I+D+i aprobado por el Ministerio de Economía y Competitividad de España titulado Mediaciones audiovisuales en las relaciones entre escuela y familias inmigrantes. Concretamente, el dirigido a conocer las funciones que tienen las imágenes fotográficas en las relaciones de un grupo de padres inmigrantes en el colegio al que asisten sus hijos e hijas. Los datos presentados corresponden a las narraciones biográfico-culturales y visuales iniciadas en las aulas por estas familias junto a la tutora del grupo, y continuadas en sus contextos personal y social. Concluimos que las fotografías en los relatos han tenido las funciones de: fuente de información, soporte de análisis, reflexión y debate y, finalmente, medio para comunicar el conocimiento experiencial generado. Dentro de esta última, se han utilizado tres procedimientos que hemos denominado: denotativo autorreferencial, connotativo texto-visual y secuencial.

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Emergent multiple predator effects (MPEs) might radically alter predictions of predatory impact that are based solely on the impact of individuals. In the context of biological invasions, determining if and how the individual-level impacts of invasive predators relates to their impacts in multiple-individual situations will inform understanding of how such impacts might propagate through recipient communities. Here, we use functional responses (the relationship between prey consumption rate and prey density) to compare the impacts of the invasive freshwater mysid crustacean Hemimysis anomala with a native counterpart Mysis salemaai when feeding on basal cladoceran prey (i) as individuals, (ii) in conspecific groups and (iii) in conspecific groups in the presence of a higher fish predator, Gasterosteus aculeatus. In the absence of the higher predator, the invader consumed significantly more basal prey than the native, and consumption was additive for both mysid species - that is, group consumption was predictable from individual-level consumption. Invaders and natives were themselves equally susceptible to predation when feeding with the higher fish predator, but an MPE occurred only between the natives and higher predator, where consumption of basal prey was significantly reduced. In contrast, consumption by the invaders and higher predator remained additive. The presence of a higher predator serves to exacerbate the existing difference in individual-level consumption between invasive and native mysids. We attribute the mechanism responsible for the MPE associated with the native to a trait-mediated indirect interaction, and further suggest that the relative indifference to predator threat on the part of the invader contributes to its success and impacts within invaded communities.

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The ecological effects of invasive species depend on myriad environmental contexts, rendering understanding problematic. Functional responses provide a means to quantify resource use by consumers over short timescales and could therefore provide insight into how the effects of invasive species vary over space and time. Here, we use novel in situ microcosm experiments to track changes in the functional responses of two aquatic mesopredators, one native and the other an invader, as they undergo diel vertical migrations through a lake water column.
The Ponto–Caspian mysid, Hemimysis anomala, a known ecologically damaging invader, generally had higher a functional response towards cladoceran prey than did a native trophic analogue, Mysis salemaai. However, this differential was spatiotemporally dependent, being minimal during the day on the lake bottom, and increasing at night, particularly inshore.
Because the functional response of the native predator was spatiotemporally consistent, the above pattern was driven by changes in the invader functional response over the diel cycle. In particular, the functional response of H. anomala was significantly reduced on the lake bottom during the daytime relative to night, and predation was especially pronounced in shallow surface waters.
We demonstrate the context dependency of the effects of an invasive predator on prey populations and emphasise the utility of functional responses as tools to inform our understanding of predator–prey interactions. In situ manipulations integrate experimental rigour with field relevance and have the potential to reveal how impacts manifest over a range of spatiotemporal scales.

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Biological invasions continue to exert pressure on ecosystems worldwide and we thus require methods that can help understand and predict the impacts of invasive species, on both native species and previously established invaders. Comparing laboratory derived functional responses among invasive and native predators has emerged as one such method, providing a robust proxy for field impacts. We used this method to examine the likely impacts of the Ponto–Caspian amphipod Dikerogammarus haemobaphes, known as the “demon shrimp”, a little investigated invader in European freshwaters that has recently established in the British Isles. We compared the functional responses on two prey species of D. haemobaphes with two other amphipod species: Dikerogammarus villosus, a congeneric invasive with well-documented impacts on macro-invertebrate communities and a native amphipod, Gammarus pulex. Prey species were native Chironomus sp. and the invasive Chelicorophium curvispinum, a tube-building amphipod also originating from the Ponto–Caspian region. D. villosus showed higher Type II functional responses towards both prey species than did D. haemobaphes and G. pulex, with the latter two predators exhibiting similar impacts on the native prey. However, D. haemobaphes had higher functional responses towards the invasive C. curvispinum than did G. pulex, both when prey individuals were tubeless and resident in their protective mud tubes. Thus, we demonstrate that functionally equivalent invasive congeners can show significantly different impacts on prey, regardless of shared evolutionary history. We also show that some predatory invaders can have impacts on native prey equivalent to native predator impacts, but that they can also exert significant impacts on previously introduced prey. We discuss the importance of invasion history and prey identity when attempting to understand and predict the impacts of new invaders.

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1. Predator–prey interactions are mediated by the structural complexity of habitats, but disentangling the many facets of structure that contribute to this mediation remains elusive. In a world replete with altered landscapes and biological invasions, determining how structure mediates the interactions between predators and novel prey will contribute to our understanding of invasions and predator–prey dynamics in general.
2. Here, using simplified experimental arenas, we manipulate predator-free space, whilst holding surface area and volume constant, to quantify the effects on predator–prey interactions between two resident gammarid predators and an invasive prey, the Ponto-Caspian corophiid Chelicorophium curvispinum.
3. Systematically increasing predator-free space alters the functional responses (the relationship between prey density and consumption rate) of the amphipod predators by reducing attack rates and lengthening handling times. Crucially, functional response shape also changes subtly from destabilizing Type II towards stabilizing Type III, such that small increases in predator-free space to result in significant reductions in prey consumption at low prey densities.
4. Habitats with superficially similar structural complexity can have considerably divergent consequences for prey population stability in general and, particularly, for invasive prey establishing at low densities in novel habitats.

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Gestión del conocimiento

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Tesis (Maestría en Ciencias de la Ingeniería Eléctrica, con especialidad en Potencia) U.A.N.L.

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[Tesis] ( Maestría en Ciencias de Enfermería con Enfasis en Salud Comunitaria) U.A.N.L.

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UANL

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This dissertation compares the activities of street gangs operating in Brazil's favelas and the barrios of El Salvador to determine the extent of the threat they pose to national security and state legitimacy. In analyzing the conditions of inequality and violence plaguing these marginal urban agglomerations we suggest that the gangs have effectively taken control of the territory by filling the void left by an absentee state. In response to the impact of organized street gangs that disrupt social order and the rule of law, the governments have respectively applied radical solutions that serve only to exacerbate the situation and do not lead to the expected results. Finally, the evolution of MS-13 in the Americas and the police interventions in the favelas of Rio in preparation for the World Cup have situated the power struggle between gangs and state at the heart of political debate.

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Ce mémoire de maîtrise a pour objectif de montrer la construction de la représentation visuelle de « l’indigène » de la région de Cuzco et sa relation avec le discours de « l’authenticité » tel que défini par l’indigénisme, l’anthropologie et le tourisme. Il s’intéresse au rôle que jouent les médias visuels et audiovisuels dans la création d’une image de l’indigène perçu comme « authentique » et d’un discours commun sur les Andes. Les documents visuels étudiés, tous produits par des Péruviens, sont une sélection de photographies prises par Martin Chambi entre 1920-1945, le film Kukuli (1961) coréalisé par les Cuzquéniens Luis Figueroa, Eulogio Nishiyama et César Villanueva et la publicité touristique de PromPerú, intitulée «Perú: Vive la leyenda» («Pérou : Vis la légende») (2008). Cette analyse fait ressortir la représentation folklorique et anthropologique de l’indigène telle que suggérée par ces documents, qui l’associent principalement avec les origines, la tradition et le passé précolombien. Elle démontre aussi comment les images constituent une alternative à la stratégie représentationnelle proposée par l’indigénisme lettré et offrent un autre regard sur la réalité. Ainsi, les images technologiques montrent des détails qui ne concordent pas avec les stéréotypes culturels et révèlent un monde d’identités plus nuancées. D’autre part, elles créent aussi un espace de collaboration –entre le photographe/cinéaste et leurs modèles– qui permet aux acteurs sociaux marginalisés de participer à leur propre représentation. Enfin, notre recherche établit le lien entre cette image de l’indigène andin et la promotion touristique du Pérou.

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Se presenta memoria final de proyecto educativo que desarrolla un programa de intervención para reducir el absentismo escolar. Se realiza en el CEIP Matemático Gallego Díaz en Úbeda, Jaén. El objetivo principal es: reducir los índices de absentismo y superar las condiciones socioculturales desfavorecedoras que actualmente soporta el alumnado del centro. El proceso consta de varias fases: fase de planificación; fase de difusión; fase de adopción; fase de implantación; fase de evaluación .