Reconstruction of the second layer of Ag on Pt(111)

The reconstruction of an Ag monolayer on Ag/Pt(111) is analyzed theoretically, employing a vertically extended Frenkel-Kontorova model whose parameters are derived from density functional theory. Energy minimization is carried out using simulated quantum annealing techniques. Our results are compatible with the STM experiments, where a striped pattern is initially found which transforms into a triangular reconstruction upon annealing. In our model we recognize the first structure as a metastable state, while the second one is the true energy minimum

Assessing real world imagery in virtual environments for people with cognitive disabilities

People with cognitive disabilities are often socially excluded. We propose a system based on Virtual and Augmented Reality that has the potential to act as an educational and support tool in everyday tasks for people with cognitive disabilities. Our solution consists of two components: the first that enables users to train for several essential quotidian activities and the second that is meant to offer real time guidance feedback for immediate support. In order to illustrate the functionality of our proposed system, we chose to train and support navigation skills. Thus, we conducted a preliminary study on people with Down Syndrome (DS) based on a navigation task. Our experiment was aimed at evaluating the visual and spatial perception of people with DS when interacting with different elements of our system. We provide a preliminary evaluation that illustrates how people with DS perceive different landmarks and types of visual feedback, in static images and videos. Although we focused our study on people with DS, people with different cognitive disabilities could also benefit from the features of our solution. This analysis is mandatory in the design of a virtual intelligent system with several functionalities that aims at helping disabled people in developing basic knowledge in every day tasks

Evaluación de ácidos grasos en las carcasas de cerdos alimentados con sorgo termoprocesado durante el crecimiento y la terminación

The growing interest on meat and fat quality has brought the implicit need to know the content and composition of pig carcass fat, due to probable negative impacts on human health. The greatest challenges are the reduction of saturated fatty acids content in meat, mainly palmitic acid, and the increase of mono- and poli-insaturated fatty acids amount. The aim of this study was to determine the composition of fatty acids in depot tissues of pigs at 90 kg of liveweight, fed on different diets, containing sorghum grains processed in different ways, or ground corn. The samples were obtained in vivo from subcutaneous fat, by biopsy. Once the samples were stabilized, the most abundant fatty acid, and the percentage of relative abundance in each sample were determined by a gas chromatography - mass spectrometry (GC - MS) coupling technique. From this experience it could be concluded that the pigs fed on sorghum, independently from its presentation, show carcasses higher in mono- and poli-insaturated fatty acids. Those fed on ground and extruded sorghum had linolenic acid in their carcasses. The diets composed by thermo-processed sorghum showed higher meat quality carcassesEl interés creciente por la calidad de la carne y de la grasa, ha traído implícita la necesidad de conocer el contenido y la composición de la grasa de la res porcina por probables impactos negativos sobre la salud humana. El mayor desafío es, la reducción del contenido de ácidos grasos saturados en la carne, principalmente del ácido palmítico, y el incremento de la cantidad de ácidos grasos monoinsaturados y poliinsaturados. El objetivo de este estudio fue determinar la composición en los distintos ácidos grasos de los tejidos de depósito de cerdos a los 90 kg de peso, expuestos a diferentes dietas compuestas por granos de sorgo sometido a distintos procesamientos en relación al grano de maíz molido, en muestras obtenidas in vivo, de grasa subcutánea mediante una biopsia. Estabilizadas las muestras obtenidas se utilizó una técnica de acoplamiento cromatógrafo de gases – espectrógrafo de masa (CG – EM) con el fin de identificar el ácido graso más abundante de la muestra y el porcentaje de abundancia relativa de otros ácidos grasos componentes de las muestras analizadas. A partir de la experiencia se pudo concluir que los cerdos alimentados con sorgo, independientemente de la forma de presentación del mismo, exponen reses con mayor presencia de ácidos monoinsaturados y poliinsaturados. Los alimentados con sorgo molido, aplastado y extruido presentaron ácido linolénico en sus carcasas. Las dietas compuestas por granos de sorgo tratados presentan carcasas con mejor calidad carnicera

Thoughts on opportunities from high-energy nuclear collisions

This document summarizes thoughts on opportunities from high-energy nuclear collisions.Comment: 10 pages, pd

Thoughts on heavy-ion physics in the high luminosity era: the soft sector

This document summarizes thoughts on opportunities in the soft-QCD sector from high-energy nuclear collisions at high luminosities.Comment: 19 page

Thoughts on opportunities in high-energy nuclear collisions

This document reflects thoughts on opportunities from high-energy nuclear collisions in the 2020s.Comment: 10 pages, pd

Estudio de las posibilidades productivas y económicas de las empresas porcinas con manejo intensivo en la región semiárida pampeana

El objetivo de esta investigación es analizar los procesos de producción que llevan en la actualidad estas empresas en la región semiárida pampeana con el fin de evaluar el desempeño productivo y económico, y a partir de éstos encontrar las causas que afectan la viabilidad productiva, económica y social del sector, para entender los motivos que en ocasiones conllevan al deterioro cultural de los grupos sociales que se dedican a esta actividad que hoy el estado nacional ha puesto a la cadena de valor porcina como prioritaria en la agenda dentro del Plan Estratégico Agroalimentario y Agroindustrial para el quinquenio 2011-2016