8,495 research outputs found
Sentido e indeterminación en la cinta blanca, de Michael Haneke
_La cinta blanca narra una serie de acontecimientos inconexos e inexplicables, actos terribles que van generando una impresión de sinsentido, hechos violentos perpetrados contra víctimas inocentes o miembros "positivos". El análisi cinematográfico de esta película revela la importancia de la exclusión social de los niños en la sociedad austriaca de entreguerras como elemento que logra despejar el enigma del filme
Comparing New Keynesian models in the Euro area: a Bayesian approach
This paper estimates and compares four versions of the sticky price New Keynesian model for the Euro area, using a Bayesian approach as described in Rabanal and Rubio-Ramírez (2003). We find that the average duration of price contracts is between four and eight quarters, similar to the one estimated in the United States, while price indexation is found to be smaller. On the other hand, average duration of wage contracts is estimated to between one and two quarters, lower than the one found for the United States, while wage indexation is higher. Finally, the marginal likelihood indicates that the sticky price and sticky wage model of Erceg, Henderson, and Levin (2002), its wage indexation variant, and the baseline sticky price model with price indexation have similar data explanation power, while it positions the baseline sticky price model of Calvo at a lower level.
Using the Kalman filter to smooth the shocks of a dynamic stochastic general equilibrium model
This paper shows how to use the Kalman filter (Kalman 1960) to back out the shocks of a dynamic stochastic general equilibrium model. In particular, we use the smoothing algorithm as described in Hamilton (1994) to estimate the shocks of a sticky-prices and sticky-wages model using all the information up to the end of the sample.
VCD helps others in molecular aggregates
Molecular self-assembly is the driving force of a great number of physical, chemical and biological processes in Nature.1 The properties of the molecular aggregates are markedly dependent on the intermolecular forces which hold together the building blocks, but also on the chemical and structural features of these building blocks. The transference of properties from the individual molecules to the bulk aggregate can be summarized in three main behaviours: disappearance (dipole moment), direct sum (weight) and enhancement (resilience). A nice example of the last group is the optical activity. The presence of a chiral seed in the molecules modulates their folding by favouring one among the available macrostructures. As a consequence, new forms of supramolecular chirality are triggered, such as helical, spiral or chiral sheets, which usually give rise to a noticeable increasing of the chiral signal of the aggregates.
Vibrational circular dichroism (VCD) is the chiral version of infrared spectroscopy. It combines the intramolecular view provided by the molecular vibrations with the selective capability of a chiral analysis. It is also a suitable technique to observe the aggregation-induced signal enhancement in any type of condensed phase (solid, liquid, gel, etc). Here we present a series of studies on supramolecular systems, Figure 1, in which VCD helps and improves the analysis obtained by other techniques of chiral analysis as electron microscopy (SEM, AFM), electronic circular dichroism (ECD), Raman optical activity (ROA) or circularly polarized luminescence (CPL). These studies are aimed to obtain structural information of the macromolecular scaffolding useful to control the features and applications of the aggregates.Universidad de Málaga, Campus de Excelencia Internacional Andalucía Tec
Comparing solution methods for dynamic equilibrium economies
This paper compares solution methods for dynamic equilibrium economies. The authors compute and simulate the stochastic neoclassical growth model with leisure choice using Undetermined Coefficients in levels and in logs, Finite Elements, Chebyshev Polynomials, Second and Fifth Order Perturbations and Value Function Iteration for several calibrations. The authors document the performance of the methods in terms of computing time, implementation complexity and accuracy and they present some conclusions about their preferred approaches based on the reported evidence.
La revista Esfuerzo: inicios periodísticos de Gilberto Owen
Se da a conocer parte de los primeros trabajos periodísticos de Gilberto Owen, así como las características de Esfuerzo, revista que Owen dirigió y distribuyó en Toluca, con colaboraciones de autores que más tarde, como él, destacarían en el ámbito de la cultura local y nacional. Los primeros textos en prosa del poeta sinaloense ya muestran el estilo que habría de caracterizarlo en su madurez literaria, además de que marcan el rumbo que Owen siguió en ese terreno hasta las páginas del periódico El Tiempo, de Bogotá, Colombia.Se da a conocer parte de los primeros trabajos periodísticos de Gilberto Owen, así como las características de Esfuerzo, revista que Owen dirigió y distribuyó en Toluca, con colaboraciones de autores que más tarde, como él, destacarían en el ámbito de la cultura local y nacional. Los primeros textos en prosa del poeta sinaloense ya muestran el estilo que habría de caracterizarlo en su madurez literaria, además de que marcan el rumbo que Owen siguió en ese terreno hasta las páginas del periódico El Tiempo, de Bogotá, Colombia
Revision sistematica de “canis” ensenadensis ameghino 1888 (carnivora, canidae) y la des- cripcion de un nuevo especimen del Pleistoceno de Argentina.
The fossil record of foxes in South America is very rich, with almost all extant South American species recorded. Currently, three fossil species are known in the Plio-Pleistocene of South America: "Dusicyon" cultridens, Dusicyon avus and "Canis" ensenadensis. In the present work we reviewed the systematics of "Canis" ensenadensis from the Pleistocene of Buenos Aires province using both qualitative and quantitative approaches. We also described a new fossil specimen (MCA 2082) from Buenos Aires Province (Argentina) that shares some similarities with "Canis" ensenadensis. We compared the fossil specimens with a large sample of specimens that includes the living species Lycalopex gymnocercus, L. culpaeus, Cerdocyon thous, L. fulvipes, L. vetulus, L. sechurae and Atelocynus microtis. We performed a Principal Component Analysis using mandibular and dental measurements, and then a geometric morphometric analysis using photographs of the lateral view of the mandible. Our results indicate that "Canis" ensenadensis is a valid species and it should be included in the genus Lycalopex. We also conclude that MCA 2082 is a member of the genus Lycalopex, probably belonging to the species L. ensenadensis. These results suggest that the biochron of L. ensenadensis reaches the Lujanian Age. Even if our assignation of MCA 2082 is incorrect, this specimen represents a different taxon from those already described for the Lujanian, thus the diversity of foxes during the Lujanian is greater than previously known.El registro fósil de zorros en América del Sur es muy rico con prácticamente todas las especies sur americanas actuales representadas en él. En la actualidad se conocen tres especies extintas para el Plio-Pleistoceno de América del Sur. “Dusicyon” cultridens, Dusicyon avus y “Canis” ensenadensis. En el presente trabajo hemos reestu- diado la sistemática de “Canis” ensenadensis del Pleistoceno de la provincia de Buenos Aires abordando enfoques cualitativos y cuantitativos. Además describimos un nuevo espécimen proveniente de la Provincia de Buenos Aires (Argentina) que comparte ciertas características con “Canis” ensenadensis. Los especímenes fósiles fueron comparados con una gran muestra de especímenes actuales correspondientes a las espe- cies L. gymnocercus, L. culpaeus, Cerdocyon thous, L. fulvipes, L. vetulus, L. sechurae y Atelocynus microtis. Se realizó un Análisis de Componentes Principales, utilizando medidas mandibulares y dentarias, y un análisis de morfometría geométrica, utilizando fotografías de vistas laterales de la mandíbula. Nuestros resultados sugieren que “Canis” ensenadensis es una especie válida y que debe ser incluida en el género Lycalopex. Además concluímos que MCA 2082 es un miembro del género Lycalopex, perteneciendo tentativamente a la especie Lycalopex ensenadensis. Esto sugiere que el biocrón de Lycalopex ensenadensis alcanzaría la Edad Lujanense. Incluso si nuestra asignación fuese incorrecta, el espéci- men representaría una especie distinta a las descriptas para el Lujanense, por lo que la diversidad de zorros del Lujanense es mayor a la pre- viamente conocida.Fil: Ramirez, Mariano Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "bernardino Rivadavia"; ArgentinaFil: Prevosti, Francisco Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "bernardino Rivadavia"; Argentina. Universidad Nacional de Luján; Argentin
Oxidized Forms of Antiaromatic Oligomers of Biphenylene
Rsumen de la comunicaciónThe importance of antiaromatic molecules in Chemistry and more recently in material science is rising. In the particular case of applications in electronics, the antiaromatic skeleton offers the favorable situation of high energy (i.e., destabilized) occupied molecular orbitals allowing to ease oxidation, doping or electron transfer to form conductive and photo-active substrates.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
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