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  • Miniatura
    Item type: Artículo ,
    Confinement tonicity on epidemic spreading
    (Springer, 2024-02)
    Almocera, Alexis Erich S.
    ;
    González, Alejandro Hernán
    ;
    Hernandez Vargas, Esteban Abelardo
    Emerging and re-emerging pathogens are latent threats in our society with the risk of killing millions of people worldwide, without forgetting the severe economic and educational backlogs. From COVID-19, we learned that self isolation and quarantine restrictions (confinement) were the main way of protection till availability of vaccines. However, abrupt lifting of social confinement would result in new waves of new infection cases and high death tolls. Here, inspired by how an extracellular solution can make water move into or out of a cell through osmosis, we define confinement tonicity. This can serve as a standalone measurement for the net direction and magnitude of flows between the confined and deconfined susceptible compartments. Numerical results offer insights on the effects of easing quarantine restrictions.
  • Miniatura
    Item type: Artículo ,
    Corrigendum to ‘Environmental magnetism as a tool to reconstruct the historical development of an urban patagonian wetland (Mallín Bahía Serena, Argentina)’ [J. South Am. Earth Sci. 182 (2026) 106197]
    (Pergamon-Elsevier Science Ltd, 2026-10)
    Petruzzella, Florencia
    ;
    Irurzun, Maria Alicia
    ;
    Massaferro, Julieta
    ;
    Enriquez, Andrea Soledad
    ;
    Andrade, Patricio Agustín
    Urban wetlands provide essential ecosystem services yet are highly vulnerable to city expansion, experiencing accelerated degradation globally. In Argentine Patagonia, mallines—distinctive wetlands characterised by soils with high organic matter content in arid and semi-arid landscapes—deliver key hydrological and ecological functions. However, these systems currently face increasing anthropogenic pressures that threaten their integrity. Despite this, knowledge of their recent environmental history remains limited, as environmental magnetism studies in the region have focused almost exclusively on lacustrine environments, largely overlooking urban- embedded wetlands. In this study, environmental magnetism was applied to reconstruct the historical devel-opment of an urban Patagonian wetland. Magnetic properties (including susceptibility, anhysteretic remanent magnetisation [ARM], and isothermal remanent magnetisation [IRM]), along with lithological descriptions and X-ray radiography, were analysed in short sediment cores retrieved from Mallín Bahía Serena, near San Carlos de Bariloche. The results reveal five distinct developmental stages, which can be grouped into three mail evolu-tionary stages: 1) a moderate-energy basal palaeo-lake (~1170–1390 CE), 2) a transition to a stable wetland environment (~1390–1810 CE), and 3) a top layer reflecting urban deterioration (~1810 CE–present). These findings demonstrate that environmental magnetism is an effective tool for distinguishing natural geogenic signals from those of anthropogenic origin.
  • Miniatura
    Item type: Artículo ,
    Influence of the inflow conditions on the dynamics of a floating wind turbine wake under harmonic surge motion
    (Copernicus Publications, 2026-07)
    Barile, Dimas Alejandro
    ;
    Sosa, Roberto
    ;
    Aubrun, Sandrine
    ;
    Otero, Alejandro Daniel
    Floating offshore wind turbines (FOWTs) are projected to undergo substantial expansion in the coming decades. However, the high compliance of their floating foundations, coupled with aerodynamic, hydrodynamic and mooring forces, leads to complex platform motions that make it difficult to predict their wake dynamics. The vortex ring structure produced during surge motion has been the subject of study for nearly a decade now but there are still many features to bring to light. As most studies have been under idealised uniform flow, there is little knowledge on how this structure behaves under atmospheric boundary layer (ABL) flow. In this work, the authors propose to study this structure under three different inflow conditions: laminar and lowturbulence no-shear flows and ABL flow. Large eddy simulations are carried out in combination with an actuator disc (AD) as a wind turbine model, with a focus on surge motion and a Strouhal number ranging between 0 and 0.47. The velocity values are extracted at a vertical plane parallel to the AD axis, which is subsequently analysed by means of proper orthogonal decomposition (POD) and phase averaging. In the POD analysis, vortex ring structures are identified under all inflow conditions, though their energy decreases as turbulence increases. Additionally, a dependence of energy on frequency is observed for low-turbulence no-shear and ABL flows, with the maximum energy occurring at Strouhal numbers 0.30 and 0.32, respectively. Furthermore, vertical meandering is detected in both cases. In low-turbulence no-shear flow, meandering and vortex rings act as decoupled phenomena. Replicating the analysis on a horizontal plane at hub height, it is observed that lateral meandering is uniformly intense under this inflow condition. Conversely, under ABL conditions, the surge motion interacts with the turbulent shear flow to actively induce a coupled vertical meandering. Vertical and lateral meandering in ABL conditions rely on entirely distinct mechanisms, the latter being unrelated to the vortex ring structure. Finally, phase-averaging analysis indicates that the wake is modulated by the surge motion, manifesting as expansions and contractions, for laminar and low-turbulence no-shear cases. Conversely, an inclination of the structures towards the flow direction is identified in the ABL conditions, attributable to the shear flow.
  • Miniatura
    Item type: Artículo ,
    Niñeces de “pueblo” (Provincia de Buenos Aires, décadas de 1970-1980)
    (Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Departamento de Historia, 2024-06)
    de Marco, Rosa María Celeste
    Este trabajo presenta un abordaje histórico sobre niñeces en espacios definidos desde una ruralidad circundante y omnipresente, aunque sin ser “del campo”. Las denominamos niñeces de “pueblo”. Situamos nuestra atención en General Belgrano, un partido de la cuenca del río Salado en provincia de Buenos Aires (Argentina), entre las décadas del setenta y ochenta. Con énfasis en la última dictadura militar (1976-1983), exploramos el modo en que dicho escenario delineó formas específicas de ser niño(a). Desde la memoria, reconstruimos diferentes escenas cotidianas donde los espacios recurrentes (escuela, calle, río Salado) son centrales para observar cómo las dinámicas sociales impregnaron la experiencia infantil, sin descuidar la impronta dictatorial que signó la etapa analizada. Enfatizamos en la relación con lo rural a través de los diferentes modos de imaginar, percibir o experimentar dicho espacio a partir de los vínculos o los afectos.
  • Miniatura
    Item type: Artículo ,
    The “National Champions” strategy in Brazil: Insights from JBS, VALE and AB-INBEV’ internationalization process (2003-2018)
    (Center of Political Economy, 2024-03)
    Clemente, Dario
    Um elemento básico da nova política econômica dos governos do PT no Brasil tem sido a busca pela internacionalização de um grupo seleto de empresas nacionais. De 2003 a 2013, o Estado brasileiro promoveu a globalização dessas empresas por meio de diversas políticas públicas, com o objetivo principal de posicionar a maior parte delas no escalão superior de seus respectivos setores globalmente. Ao mesmo tempo, a internacionalização foi uma das principais estratégias “defensivas” adotadas pelas principais empresas brasileiras desde os anos ‘90, tornando-se uma verdadeira “estratégia global” nos últimos 20 anos para lidar com tendências profundamente transformadoras em nível mundial. Aqui, olhamos especificamente para o caminho de internacionalização seguido pela JBS, VALE e AB-INBEV, destacando padrões comuns como a realização de trajetórias expansivas caracterizadas por fases distintas e cumulativas de consolidação; penetração de indústrias mundiais em rápida concentração; uma tendência comum à dispersão do controle acionário, aquisição estrangeira e deslocalização das atividades centrais nos principais mercados; crescente financeirização dos negócios; emergência da China como principal mercado de referência. Concluímos que as trajetórias de internacionalização da JBS, VALE e AB-INBEV apresentam algumas deficiências na estratégia dos “Campeões Nacionais”. No entanto, alertamos contra a tentação de considerar os resultados mistos dessa estratégia simplesmente como um “fracasso” da nova política industrial como um todo.