Modeling the dust emission from PN IC418

We construct a detailed model for the IR dust emission from the PN IC 418. We succeed to reproduce the emission from 2 to 200$\mu$m. We can determine the amount of emitting dust as well as its composition, and compare to the depletion of elements determined for the photoionized region.Comment: Poster contribution (2 pages, 1 figure) to IAU Symposium 283: "Planetary Nebulae: An Eye to the Future" held in Puerto de la Cruz, Tenerife, Spain in July 25th-29th 2011. Few typos correcte

Enzibióticos bactericidas mejorados frente a neumococo y otras bacterias

La presente invención se encuadra dentro del campo de la biotecnología. En la presente invención se presenta una secuencia polipeptídica derivada del módulo de unión a pared del enzima lítica del fago Cp7 (Cpl-7), que permite la construcción de nuevas enzimas líticas con actividad bactericida mejorada y amplio espectro. Igualmente, en esta invención se incluyen enzimas quiméricas que contienen dicho módulo de unión a pared mejorado y se dan ejemplos de su actividad frente a especies Gram-positivas y Gram-negativas.Peer reviewedConsejo Superior de Investigaciones Científicas, CIBER Enfermedades Respiratorias (CIBERES)A2 Solicitud de patente sin informe sobre el estado de la técnic

Unified formalism for higher-order non-autonomous dynamical systems

This work is devoted to giving a geometric framework for describing higher-order non-autonomous mechanical systems. The starting point is to extend the Lagrangian-Hamiltonian unified formalism of Skinner and Rusk for these kinds of systems, generalizing previous developments for higher-order autonomous mechanical systems and first-order non-autonomous mechanical systems. Then, we use this unified formulation to derive the standard Lagrangian and Hamiltonian formalisms, including the Legendre-Ostrogradsky map and the Euler-Lagrange and the Hamilton equations, both for regular and singular systems. As applications of our model, two examples of regular and singular physical systems are studied.Comment: 43 pp. We have corrected and clarified the statement of Propositions 2 and 3. A remark is added after Proposition

Procesos de limitación demográfica

Este capítulo ofrece una revisión de los factores que afectan a la regeneración natural de la vegetación, considerando la serie de etapas demográficas que determinan la dinámica de una población. Son muy escasos los estudios disponibles que analizan toda la serie de eventos concatenados entre la producción de flores y frutos y el establecimiento exitoso de una planta adulta reproductiva. También son escasos los trabajos que permiten establecer los efectos aplazados que tienen las interacciones con animales a lo largo del ciclo de regeneración. La aproximación que proponemos cuantifica las pérdidas de propágulos en cada etapa demográfica e identifica “cuellos de botella” del reclutamiento que pueden colapsar la regeneración natural de una especie. Revisamos una serie de casos de estudio que ilustran diversos procesos de limitación demográfica. El uso de técnicas explícitamente demográficas es fundamental para comprender la evolución de las especies forestales Mediterráneas y para diseñar actuaciones de preservación de sus poblaciones y de su extraordinaria diversidad.We review the main factors influencing recruitment limitation in Mediterranean woody species by considering the sequential stages that determine the demographic cycle. Very few studies examine the whole set of demographic stages, from flower production to the successful establishment of adult reproductive plants, and their influence on recruitment. There are also few studies exploring the delayed effects of animal interactions throughout the regeneration cycle, but the information on stage-specific effects is more detailed. We propose an approach that quantifies the propagule losses at each sequential demographic stage and identifies demographic bottlenecks that might collapse population growth. We review a series of case studies illustrating different limitation processes. The use of explicit demographic techniques is central to understand the evolution of Mediterranean woody species and to design sound, ecologically-based, conservation plans to preserve their extraordinary diversity

Gestión de la presión de PLV: estudio de su eficacia en términos de recuerdo y reconocimiento

El objetivo principal de este trabajo es aportar conocimiento para la mejora de la gestión de la publicidad en lugar de venta (PLV). Se ha realizado un experimento en una librería para analizar el efecto publicitario generado por la PLV en términos cognitivos. Utilizando carteles como estímulos publicitarios y como variables dependientes medidas de memoria (recuerdo y reconocimiento), se contrasta la influencia de un conjunto amplio de variables que influyen en la eficacia cognoscitiva de la PLV: la presión publicitaria (superficie ocupada por los carteles), el diseño del cartel (color y mensaje promocional), la notoriedad previa del producto que se comunica, la afinidad del cliente con el producto y la influencia del entorno en cual se ubica la PLV. Las conclusiones aportan una guía para la optimización de la eficacia, en términos de recuerdo y reconocimiento, de las acciones de comunicación en el punto de venta.The main objective of this work is to contribute knowledge for the improvement of the management of point-of-sale advertising (POSA). An experiment was carried out in a library to analyze the advertising effect generated by in-store advertising in cognitive terms. Using posters as advertising stimuli and as dependent variables measures of memory (recall and recognition), we contrast the influence of a broad set of variables that influence the cognitive efficacy of POSA : advertising pressure (area occupied by posters), design of the poster (color and promotional message), the prior notoriety of the product being communicated, the customer's affinity with the product and the influence of the environment in which the POS is located. The conclusions provide a guide for optimizing the effectiveness, in terms of recall and recognition, of the communication actions at the point of sale

Malonic acid: A potential reagent in decontamination processes for Ni-rich alloy surfaces

The ability of malonic acid as a dissolution agent toward synthetic Ni ferrite and Alloy 600 and 800 corrosion products was explored. Its performance in the dissolution kinetics of Ni ferrite powders was compared with the one of oxalic acid. Kinetic parameters were obtained and the dependency on external Fe(II) was modelled. Oxidized samples used in descaling tests were prepared by exposure of coupons of both alloys to lithiated aqueous solutions, under hydrothermal conditions and hydrogen overpressure, simulating PHWR conditions. Oxide layer morphology, the influence of exposure time to corrosive medium and LiOH concentration on its thickness were characterized. Descaling tests consisting on a two-stage method (a first oxidizing step with alkaline permanganate followed by a reducing step with oxalic or malonic acid were carried out). Results were compared to those obtained with a well known chemical cleaning formulation (APAC: Alkaline Permanganate Ammonium Citrate) used in decontamination of several reactors and loops and the competitiveness of malonic acid was demonstrated.Fil: García, D.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; ArgentinaFil: Bruyre, V. I. E.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; ArgentinaFil: Bordoni, R.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Olmedo, A. M.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Morando, Pedro Juan. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Armonización del análisis NIRS de grasa de cerdo ibérico: transferencia de calibraciones de ácidos grasos

El objetivo del presente trabajo es mostrar la posibilidad de transferir ecuaciones de calibración para la determinación de ácidos grasos en grasa de cerdo Ibérico en diferentes instrumentos NIRS, empleando para ello cápsulas no selladas

Extended parametric resonances in nonlinear Schrodinger systems

We study an example of exact parametric resonance in a extended system ruled by nonlinear partial differential equations of nonlinear Schr\"odinger type. It is also conjectured how related models not exactly solvable should behave in the same way. The results have applicability in recent experiments in Bose-Einstein condensation and to classical problems in Nonlinear Optics.Comment: 1 figur

ROC evaluation of statistical wavelet-based analysis of brain activation in [15O]-H2O PET scans

This paper presents and evaluates a wavelet-based statistical analysis of PET images for the detection of brain activation areas. Brain regions showing significant activations were obtained by performing Student's t tests in the wavelet domain, reconstructing the final image from only those wavelet coefficients that passed the statistical test at a given significance level, and discarding artifacts introduced during the reconstruction process. Using Receiver Operating Characteristic (ROC) curves, we have compared this statistical analysis in the wavelet domain to the conventional image-domain Statistical Parametric Mapping (SPM) method. For obtaining an accurate assessment of sensitivity and specificity, we have simulated realistic single subject [15O]-H2O PET studies with different hyperactivation levels of the thalamic region. The results obtained from an ROC analysis show that the wavelet approach outperforms conventional SPM in identifying brain activation patterns. Using the wavelet method, activation areas detected were closer in size and shape to the region actually activated in the reference image.Publicad