Architecting the cyberinfrastructure for National Science Foundation Ocean Observatories Initiative (OOI)

The NSF Ocean Observatories Initiative (OOI) is a networked ocean research observatory with arrays of instrumented water column moorings and buoys, profilers, gliders and autonomous underwater vehicles (AUV) within different open ocean and coastal regions. OOI infrastructure also includes a cabled array of instrumented seafloor platforms and water column moorings on the Juan de Fuca tectonic plate. This networked system of instruments, moored and mobile platforms, and arrays will provide ocean scientists, educators and the public the means to collect sustained, time-series data sets that will enable examination of complex, interlinked physical, chemical, biological, and geological processes operating throughout the coastal regions and open ocean. The seven arrays built and deployed during construction support the core set of OOI multidisciplinary scientific instruments that are integrated into a networked software system that will process, distribute, and store all acquired data. The OOI has been built with an expectation of operation for 25 years.Peer Reviewe

Interpolative method for transport properties of quantum dots in the Kondo regime

We present an interpolative method for describing coherent transport through an interacting quantum dot. The idea of the method is to construct an approximate electron self-energy which becomes exact both in the limits of weak and strong coupling to the leads. The validity of the approximation is first checked for the case of a single (spin-degenerate) dot level. A generalization to the multilevel case is then discussed. We present results both for the density of states and the temperature dependent linear conductance showing the transition from the Kondo to the Coulomb blockade regime.Comment: 8 pages, 3 figures, includes lamuphys.sty, submitted to the Proceedings of the XVI Sitges Conference on Statistical Mechanic

Posición serial, densidad informativa y velocidad de lectura en el recuerdo de las cuñas de radio

One of the main goals of commercial communication is the recall of the product or service in an attempt to promote the purchase. The recall of a radio ad depends on several factors affecting its structural characteristics. At the macro level, because most of the radio commercials take the format of an ad, inserted into commercial breaks, it is important to determine if the degree of recall of the content is influenced by the position of the ad into the advertising break. But, furthermore, the degree of recall of an ad can be influenced by other microstructural elements, such as its density of information or its speech rate. Therefore, this study is to analyze if a serial position effect is found in the recall of radio commercials and if this can be influenced by other characteristics of the ad. The findings of the study suggest that it is not so important the position of the ad in the radio advertising break as their microstructural characteristics. When an advertisement presents low information density and effective formal elements, as well as improving the recall level, promotes the emergence of a serial position effect. Instead, this phenomenon does not occur when the microstructural conditions are not favorable.Uno de los objetivos prioritarios de la comunicación publicitaria es facilitar que el producto o servicio se recuerde después de la emisión en un intento de promover el consumo. El recuerdo de un anuncio radiofónico depende de varios factores que afectan a sus características estructurales. A nivel macroestructural, puesto que la publicidad radiofónica mayoritariamente adopta el formato de cuña, insertada en bloques publicitarios, resulta entonces importante determinar si el grado de recuerdo del contenido queda influido por la posición de la cuña dentro del bloque publicitario. Pero, junto a ello, existen otros elementos microestructurales que pueden influir en el grado de recuerdo de una cuña, como pueden ser la densidad informativa que contiene o la velocidad de lectura a la que se emite. Por tanto, esta investigación tiene como objetivo analizar si existe un efecto de posición serial en el recuerdo de las cuñas radiofónicas y si, unido a él, influyen otras peculiaridades del anuncio. Los resultados del estudio apuntan a que no es tan importante la posición en que se inserta la cuña radiofónica en el bloque publicitario como sus características microestructurales. Cuando un anuncio reúne escasa densidad informativa y elementos formales eficaces, además de incrementar el nivel de recuerdo, favorece que se produzca un efecto de posición serial. En cambio, éste no se produce cuando sus condiciones microestructurales no son favorables

The Andreev states of a superconducting quantum dot: mean field vs exact numerical results

We analyze the spectral density of a single level quantum dot coupled to superconducting leads focusing on the Andreev states appearing within the superconducting gap. We use two complementary approaches: the numerical renormalization group and the Hartree-Fock approximation. Our results show the existence of up to four bound states within the gap when the ground state is a spin doublet (\pi\ phase). Furthermore the results demonstrate the reliability of the mean field description within this phase. This is understood from a complete correspondence that can be established between the exact and the mean field quasiparticle excitation spectrumComment: 6 pages, 5 figure

La edad de la incertidumbre: un estudio del cuento fantástico del siglo XX en Latinoamérica

The fantastic is a constant presence in the fiction, and in the story, of twentieth century Latin America. This book comes near to this way or narrative through the detailed analysis of some of the stories and significant authors (Leopoldo Lugones, Felisberto Hernandez, Jorge Luis Borges, Julio Cortázar, Gabriel Garci'a Márquez, Isabel Beyond or Ferré Rosary) Their work explains the enormous variety of forms that takes the fantastic phenomenon in Latin America.

Los espectros de los desaparecidos : pasajes entre compromiso político y visión literaria en los últimos cuentos de Cortázar

The uneasy relationship between literary conception and political commitment is a recurrent subject of meditation in Julio Cortázar’s writings and amongst his critics. The debate revolves around two main considerations: firstly, to what extent and how (if so) Cortázar managed to reconcile his aesthetic ideas with his ethical views; secondly, whether this reconciliation attempt meant a paradigm change in his poetics or not. These deliberations reached a culmination point and appeared in its most illuminating form in Cortázar’s last three short story compilations; particularly in those stories where the need for political and ethical engagement articulates with the fantastic, one of the predominant narrative modes in his poetics. This article examines four of these short stories as prime examples of Cortázar’s attempt to reconcile the individual metaphysical search typical of his early writings with his later political pledges. The hypothesis is that these stories actually represent an excellent instance of how he was able to achieve a harmonic symbiosis between his poetics and his politics in the last years of his life

Non-equilibrium dynamics of Andreev states in the Kondo regime

The transport properties of a quantum dot coupled to superconducting leads are analyzed. It is shown that the quasiparticle current in the Kondo regime is determined by the non-equilibrium dynamics of subgap states (Andreev states) under an applied voltage. The current at low bias is suppressed exponentially for decreasing Kondo temperature in agreement with recent experiments. We also predict novel interference effects due to multiple Landau-Zener transitions between Andreev states.Comment: Revtex4, 4 pages, 4 figure