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On the regularity of human mobility

CONICET Digital -

On the regularity of human mobility Mucelli Rezende Oliveira, Eduardo; Carneiro Viana, Aline; Sarraute, Carlos; Brea, Jorge Nicolás; Alvarez Hamelin, Jose Ignacio Understanding human mobility patterns is crucial to fields such as urban mobility and mobile network planning. For this purpose, we make use of large-scale datasets recording individuals spatio-temporal locations, from eight major world cities: Beijing, Tokyo, New York, Paris, San Francisco, London, Moscow and Mexico City. Our contributions are two-fold: first, we show significant similarities in people’s mobility habits regardless of the city and nature of the dataset. Second, we unveil three persistent traits present in an individual’s urban mobility: repetitiveness, preference for shortest-paths, and confinement. These characteristics uncover people’s tendency to revisit few favorite venues using the shortest-path available.

Relativistic Jets in Active Galactic Nuclei and Microquasars

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Relativistic Jets in Active Galactic Nuclei and Microquasars Romero, Gustavo Esteban; Boettcher, Markus; Markoff, Sera; Tavecchio, Fabrizio Collimated outflows (jets) appear to be a ubiquitous phenomenon associated with the accretion of material onto a compact object. Despite this ubiquity, many fundamental physics aspects of jets are still poorly understood and constrained. These include the mechanism of launching and accelerating jets, the connection between these processes and the nature of the accretion flow, and the role of magnetic fields; the physics responsible for the collimation of jets over tens of thousands to even millions of gravitational radii of the central accreting object; the matter content of jets; the location of the region(s) accelerating particles to TeV (possibly even PeV and EeV) energies (as evidenced by (Formula presented.)-ray emission observed from many jet sources) and the physical processes responsible for this particle acceleration; the radiative processes giving rise to the observed multi-wavelength emission; and the topology of magnetic fields and their role in the jet collimation and particle acceleration processes. This chapter reviews the main knowns and unknowns in our current understanding of relativistic jets, in the context of the main model ingredients for Galactic and extragalactic jet sources. It discusses aspects specific to active Galactic nuclei (especially blazars) and microquasars, and then presents a comparative discussion of similarities and differences between them.

Inhomogeneous diffusion and ergodicity breaking induced by global memory effects

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Inhomogeneous diffusion and ergodicity breaking induced by global memory effects Budini, Adrian Adolfo We introduce a class of discrete random walk model driven by global memory effects. At any time the right-left transitions depend on the whole previoushistory of the walker, being defined by an urn-like memory mechanism. The characteristic function is calculated in an exact way, which allows us todemonstrate that the ensemble of realizations is ballistic. Asymptoticallyeach realization is equivalent to that of a biased Markovian diffusion process with transition rates that strongly differs from one trajectory to another. Using this "inhomogeneous diffusion" feature the ergodic properties of the dynamics are analytically studied through the time-averaged moments. Even in the long time regime they remain random objects. While their average over realizations recover the corresponding ensemble averages, departure between time and ensemble averages is explicitly shown through their probability densities. For the density of the second time-averaged moment an ergodic limit and the limit of infinite lag times do not commutate. All these effects are induced by the memory effects. A generalized Einstein fluctuation-dissipation relation is also obtained for the time-averaged moments.

Apertura de EMPRETECNO 2016

ANPCyT -

La Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT), a través del Fondo Argentino Sectorial (FONARSEC), convoca a la presentación de propuestas para apoyar el desarrollo de emprendimientos de intensidad tecnológica.

El Panteón de la Patagonia de Domingo Pronsato: arte público, relato histórico y producción en la ocupación del espacio (Bahía Blanca, Argentina, (1968/1970)

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El Panteón de la Patagonia de Domingo Pronsato: arte público, relato histórico y producción en la ocupación del espacio (Bahía Blanca, Argentina, (1968/1970); The Panteón de la Patagonia by Domingo Pronsato: public art, historical narrative and production in the ocuppation of space (Bahía Blanca, Argentina, 1968/1970) López Pascual, Juliana En este trabajo nos proponemos reconstruir el proyecto celebratorio del “Panteón de la Patagonia”, elaborado desde Bahía Blanca (Argentina) por el artista y gestor cultural Domingo Pronsato (1881-1971) a fines de los años ’60. A partir del análisis de sus escritos y de las características formales de la propuesta artística, procuramos dar cuenta de la convergencia en ella de las opciones ideológicas de su autor, así como de los intereses geopolíticos y económicos de la burguesía local sobre los territorios del sur del país, del clima de época militarista y represivo que les daba contexto y de las formas en las que el relato histórico constituyó un recurso de legitimación de las decisiones sobre el espacio y lo público. Buscaremos, entonces, problematizar el programa estético y arquitectónico a la luz de las variables económicas, sociales y políticas que atravesaron su concepción y le otorgaron sentidos excedentes a la dimensión artística.; In this paper we intend to reconstruct the celebratory project “Panteón de la Patagonia” proposed in Bahia Blanca (Argentina) by the artist and cultural broker Domingo Pronsato (1881-1971) in the late ‘60s. Based on the analysis of his writings and the formal characteristics of the artistic proposal, we try to account for the convergence of his ideological choices, as well as the geopolitical and economic interests of the local bourgeoisie over the southern territories of the country, the militaristic and repressive climate that gave it context and the ways in which the historical narrative constituted a resource for legitimizing decisions regarding space and public sphere. We will seek, then, to problematize this aesthetic and architectural program in light of the economic, social and political variables that crossed its conception and gave it meanings that exceed the artistic dimension.; En aquest treball ens proposem reconstruir el Projecte celebratori del “Panteó de la Patagònia”, elaborat des de Bahia Blanca (Argentina) per l’artista i gestor cultural, Domingo Pronsato (1881-1971) a les acaballes dels anys ‘60. A partir de l’anàlisi dels seus escrits i de les característiques formals de la proposta artística, procurem donar compte de la convergència a la via dels opcions ideològiques del seu autor, així com dels interessos geopolítics i econòmics de la burgesia local sobre els territoris del sud del país, del clima d’època militarista i repressiu que els donava i de les formes en les que el relat històric va constituir un recurs de legitimació de les decisions sobre l’espai públic. Buscarem, llavors, problematitzar el programa estètic i arquitectònic a la llum de les variables Econòmiques, Socials i Polítiques que van travessar la seva concepció i li van atorgar sentits excedents a la dimensió artística.; Dans cet article, on propose de reconstruire le projet commémoratif «Panteón de la Patagonia” préparé à Bahia Blanca (Argentine) par l’artiste et opérateur culturel Domingo Pronsato (1881-1971) a la fin des années 60. De l’analyse de ses écrits et des caractéristiques formelles de la proposition artistique, on essaye de exposer qu’y convergent des choix idéologiques de son auteur, ainsi que des intérêts géopolitiques et économiques de la bourgeoisie locale sur les territoires du sud le pays, le climat de l’ère militariste et répressive qui leur a donné le contexte et la manière dont le récit historique constituait une ressource de légitimation de décisions à propos de l’espace et de ce qui est public. On cherche donc de remettre en question le programme esthétique et architecturale à la lumière des variables économiques, sociales et politiques qui ont traversé sa conception et lui ont donné des sens excédentes de la dimension artistique.

Duplex PCR for the diagnosis of Brucella melitensis and its differentiation from the REV-1 vaccine strain

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Duplex PCR for the diagnosis of Brucella melitensis and its differentiation from the REV-1 vaccine strain Alvarez, Lucía Paula; Marcellino, R. B.; Martinez, A.; Robles, C. A. Caprine brucellosis is a chronic infectious disease caused by Brucella melitensis, whose main symptoms are abortion in females and orchitis in males. Vaccination by mistake of pregnant goats with the REV-1 vaccine may cause abortions. The aim of this study was to develop a duplex PCR that could identify and differentiate the DNA of B. melitensis field strains from that of the REV-1 vaccine strain. The results showed that the duplex PCR performed on DNA isolated from infected tissues is very convenient as it significantly shortens the time of detection of the etiological agent, yields a reliable result and has an acceptable cost.

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