2,491 research outputs found

    Determining interaction rules in animal swarms

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    In this paper we introduce a method for determining local interaction rules in animal swarms. The method is based on the assumption that the behavior of individuals in a swarm can be treated as a set of mechanistic rules. The principal idea behind the technique is to vary parameters that define a set of hypothetical interactions to minimize the deviation between the forces estimated from observed animal trajectories and the forces resulting from the assumed rule set. We demonstrate the method by reconstructing the interaction rules from the trajectories produced by a computer simulation.Comment: v3: text revisions to make the article more comprehensibl

    Tax Policy and Industrial Policy

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    taxation and industrial polic

    Simplification and Reform

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    Simplification and Reform

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    Tackling America's Eating Habits, One Store at a Time

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    http://dx.doi.org/10.1126/science.337.6101.147

    From single steps to mass migration: the problem of scale in the movement ecology of the Serengeti wildebeest

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    A central question in ecology is how to link processes that occur over different scales. The daily interactions of individual organisms ultimately determine community dynamics, population fluctuations and the functioning of entire ecosystems. Observations of these multiscale ecological processes are constrained by various technological, biological or logistical issues, and there are often vast discrepancies between the scale at which observation is possible and the scale of the question of interest. Animal movement is characterized by processes that act over multiple spatial and temporal scales. Second-by-second decisions accumulate to produce annual movement patterns. Individuals influence, and are influenced by, collective movement decisions, which then govern the spatial distribution of populations and the connectivity of meta-populations. While the field of movement ecology is experiencing unprecedented growth in the availability of movement data, there remain challenges in integrating observations with questions of ecological interest. In this article, we present the major challenges of addressing these issues within the context of the Serengeti wildebeest migration, a keystone ecological phenomena that crosses multiple scales of space, time and biological complexity. This article is part of the theme issue ’Collective movement ecology’

    El modelo de desarrollo con inclusión y su inserción en la multipolaridad: Agendas y geopolíticas en conflicto

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    Durante los últimos diez años, la Argentina y la región encararon un cambio paradigmático.1 Esto se produce en primer lugar a nivel de modelo de acumulación o de desarrollo, y por tanto del rol del Estado en relación con la economía y la sociedad. La crisis del modelo neoliberal generó una praxis concretada en otro rol del Estado y políticas públicas, y una concepción original sobre la resolución de la crisis de endeudamiento impuesta por la financiación de la economía. Un enfoque analítico en el cual confluyen matrices nacional-populares, neodesarrollistas, progresistas y de izquierda latinoamericana que terminan por perfilar un modelo de desarrollo con inclusión social.Fil: Garcia Delgado, Daniel Reynaldo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Facultad Latinoamericana de Ciencias Sociales; Argentin

    Fission–fusion populations

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