315,050 research outputs found

    Contribution to the knowledge of Margaritifera auricularia (Spengler, 1793) in the Tagus river (Spain)

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    La dramática situación en que se encuentra la especie de molusco bivalvo de agua dulce en peligro Crítico de extinción Margaritifera auricularia (Spengler, 1793) ha sido puesta de manifiesto por distintos autores (ALTABA, 1990; ARAUJO & RAMoS, 2000; ARAUJO, 2009; ARAUJO, 2012).Peer Reviewe

    Gil de Araujo

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    Contribución al conocimiento de las especies argentinas del género Lepidura Townes (Ichneumonidae: Mesochorinae), con la descripción del macho de L. patagonica Araujo & Vivallo

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    Lepidura Townes es un género con distribución andina de la subfamilia Mesochorinae, con especies presentes en Chile y Argentina. De las 14 especies descritas, los machos permanecen desconocidos en siete: L. callaina Dasch, L. improcera Dasch, L. mallecoensis Dasch, L. nigricephala Araujo & Vivallo, L. patagonica Araujo & Vivallo, L. seminitida Araujo & Vivallo y L. viridis Dasch. En base al estudio de especímenes depositados en el Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina, aquí se describe e ilustra por primera vez el macho de L. patagonica. Adicionalmente, se proporciona un nuevo registro de distribución deL. olivacea Dasch en Argentina.Lepidura Townes is a genus with an Andean distribution of the subfamily Mesochorinae, occurring in Chile and Argentina. Among the 14 species described, the males remain unknown in seven: L. callaina Dasch, L. improcera Dasch, L. mallecoensis Dasch, L. nigricephala Araujo & Vivallo, L. patagonica Araujo & Vivallo, L. seminitida Araujo & Vivallo and L. viridis Dasch. Based on the study of specimens deposited in the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina, the male of L. patagonica is described and illustrated for the first time. In addition, a new distribution record of L. olivacea Dasch in Argentina is also provided.Fil: Araujo, Rodrigo. Universidad Catolica de Maule; ChileFil: Vivallo, Felipe. Universidade Federal do Rio de Janeiro; BrasilFil: Martinez, Juan Jose. Universidad Nacional de la Pampa. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; Argentin

    Endogenous debt constraints in collateralized economies with default penalties

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    In infinite horizon financial markets economies, competitive equilibria fail to exist if one does not impose restrictions on agents' trades that rule out Ponzi schemes. When there is limited commitment and collateral repossession is the unique default punishment, Araujo, Páscoa and Torres-Martínez (2002) proved that Ponzi schemes are ruled out without imposing any exogenous/endogenous debt constraints on agents' trades. Recently Páscoa and Seghir (2009) have shown that this positive result is not robust to the presence of additional default punishments. They provide several examples showing that, in the absence of debt constraints, harsh default penalties may induce agents to run Ponzi schemes that jeopardize equilibrium existence.The objective of this paper is to close a theoretical gap in the literature by identifying endogenous borrowing constraints that rule out Ponzi schemes and ensure existence of equilibria in a model with limitedcommitment and (possible) default. We appropriately modify the definition of finitely effective debt constraints, introduced by Levine and Zame (1996) (see also Levine and Zame (2002)), to encompass models with limited commitment, default penalties and collateral. Along this line, we introduce in the setting of Araujo, Páscoa and Torres-Martínez (2002), Kubler and Schmedders (2003) and Páscoa and Seghir (2009) the concept of actions with finite equivalent payoffs. We show that, independently of the level of default penalties, restricting plans to have finite equivalent payoffs rules out Ponzi schemes and guarantees the existence of an equilibrium that is compatible with the minimal ability to borrow and lend that we expect in our model.An interesting feature of our debt constraints is that they give rise to budget sets that coincide with the standard budget sets of economies having a collateral structure but no penalties (as defined in Araujo,Páscoa and Torres-Martínez (2002)). This illustrates the hidden relation between finitely effective debt constraints and collateral requirements.

    Reconciling with the Past: Ana Lucia Araujo’s Lecture on Coming to Terms with the Past When Monuments Are Taken Down

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    On Thursday, November 2nd, Howard University History Professor Ana Lucia Araujo visited Gettysburg College to give a lecture titled “Slavery, Memory, and Reparations: Coming to Terms with the Past When Monuments Are Taken Down.” The historian, author, and professor talked about the history of slavery as well as the concepts of memory and reparations. One form of reparations discussed recently has been the removal of Confederate monuments in the United States, which has been heavily debated for years. [excerpt

    Galactic cosmic-ray energy spectra and expected solar events at the time of future space missions

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    none8sìAccepted for publicationopenGrimani, Catia; Araujo, H. M.; Fabi, M.; Lobo, A.; Mateos, I.; Shaul, D. N. A.; Sumner, T. J.; Wass, P.Grimani, Catia; Araujo, H. M.; Fabi, M.; Lobo, A.; Mateos, I.; Shaul, D. N. A.; Sumner, T. J.; Wass, P
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