CO-PrOx over nano-Au/TiO2: Monolithic catalyst performance and empirical kinetic model fitting

In this work, the performance of ceramic monoliths washcoated with Au/TiO2 is studied on CO preferential oxidation (CO-PrOx) reaction in H2-rich environments under a wide range of operating conditions of practical interest. The parameter estimation of a nonlinear kinetic empirical model representing this system is made via genetic algorithms by fitting the model predictions against our laboratory observations. Parameter uncertainty leading to inaccurate predictions is often present when kinetic models with nonlinear rate equations are considered. Here, after the fitting was concluded, a statistical study was conducted to determine the accuracy of the parameter estimation. Activation energies of ca. 30 kJ/mol and 55 kJ/mol were adjusted for CO and H2 oxidations, respectively. The catalyst showed appropriate activity and selectivity values on the CO oxidation on a H2-rich environment. After ca. 45 h on stream the catalyst showed no deactivation. Results show that the model is suitable for reproducing the behavior of the CO-PrOx reactions and it can be used in the design of reactors for hydrogen purification.Peer ReviewedPostprint (author's final draft

A Tractable Line-of-Sight Product Channel Model: Application to Wireless Powered Communications

We here present a general and tractable fading model for line-of-sight (LOS) scenarios, which is based on the product of two independent and non-identically distributed κ- μ shadowed random variables. Simple closed-form expressions for the probability density function and cumulative distribution function are derived, which are as tractable as the corresponding expressions derived from a product of Nakagami-m random variables. This newly proposed model simplifies the challenging characterization of LOS product channels, as well as combinations of LOS channels with non-LOS ones. Results are used to analyze performance measures of interest in the context of wireless powered communications.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Patrimonio natural y cultural de Tepotzotlán

324 páginas. Especialización en Diseño, Planificación y Conservación de Paisajes y Jardines.El presente documento muestra el trabajo realizado para la intervención paisajística en pueblo de Tepotzotlán. Al ser catalogado en el programa de pueblos mágicos dada su riqueza tangible e intangible; resulta relevante su estudio a fin de rescatar y/o enaltecer algunas de las virtudes que lo resguardan. La zona de intervención se enfocó esencialmente en el polígono patrimonial del centro histórico, los caminos constituidos a lo largo de Rio Chiquito y calles aledañas que conectan los tesoros patrimoniales de la zona. Dicho estudio fue abordado principalmente por grupos de trabajo interdisciplinario, conformados por alumnos de la especialidad en Paisajes y Jardines Históricos de la UAM Azcapotzalco. Se cotejaron 5 proyectos detonadores: Centro Histórico/Atrio de los Olivos, Par vial, Rio Chiquito, Camino Real de Lluvias y Acequia Real. Durante la primera etapa, se establecieron las limitaciones y potencialidades del sitio. Se recopiló información cualitativa y cuantitativa para la formulación y ejecución de un plan maestro que regirían los parámetros y objetivos en cada proyecto. El desarrollo conceptual y anteproyecto para cada zona de intervención, se reflejó en la segunda etapa de este proceso. Paralelamente, la elaboración de la propuesta de vegetación, las fichas de cada especie vegetal y la preparación de catálogos de paisaje, complementan el carácter de este trabajo. El proyecto realizado en Tepotzotlán: “Patrimonio Natural y Cultural De Tepotzotlán”, emerge, como el título del trabajo indica: desde la visión del rescate patrimonial, constituido por elementos materiales y naturales relevantes para la población local y todos sus visitantes. La última etapa comprende la puesta en marcha del proyecto ejecutivo, donde se plasmaron los detalles que dan cuerpo a cada elemento de las propuestas de diseño, la información necesaria para su construcción y la síntesis de toda la documentación consultada y elaborada, como sostén de diseño. En las siguientes páginas y capítulos, se explicará de manera extensa y particular: la metodología planteada y utilizada en el abordaje de cada proyecto. En general, se podrá observar la construcción de un trabajo paisajístico integral, llevado a cabo a lo largo de un año de esfuerzo y dedicación, vertidos en la presente tesis.Consejo Nacional de Ciencia y Tecnología (México)

Ground state wave functionals for 1+11+1-dimensional fermion field theories

We use path-\-integral methods to derive the ground state wave functions of a number of two-\-dimensional fermion field theories and related systems in one-\-dimensional many body physics. We derive the exact wave function for the Thirring/Luttinger and Coset fermion models and apply our results to derive the universal behavior of the wave functions of the Heisenberg antiferromagnets and of the Sutherland model. We find explicit forms for the wave functions in the density and in the Grassmann representations. We show that these wave functions always have the Jastrow factorized form and calculated the exponent. Our results agree with the exponents derived from the Bethe Ansatz for the Sutherland model and the Haldane-\-Shastri spin chain but apply to all the systems in the same universality class.Comment: 42 pages. P92-6-8

Energy Drink Administration in Combination with Alcohol Causes an Inflammatory Response and Oxidative Stress in the Hippocampus and Temporal Cortex of Rats

Energy drinks (EDs) are often consumed in combination with alcohol because they reduce the depressant effects of alcohol. However, different researches suggest that chronic use of these psychoactive substances in combination with alcohol can trigger an oxidative and inflammatory response. These processes are regulated by both a reactive astrogliosis and an increase of proinflammatory cytokines such as IL-1β, TNF-α, and iNOS, causing cell death (apoptosis) at the central and peripheral nervous systems. Currently, mechanisms of toxicity caused by mixing alcohol and ED in the brain are not well known. In this study, we evaluated the effect of chronic alcohol consumption in combination with ED on inflammatory response and oxidative stress in the temporal cortex (TCx) and hippocampus (Hp) of adult rats (90 days old). Our results demonstrated that consuming a mixture of alcohol and ED for 60 days induced an increase in reactive gliosis, IL-1β, TNF-α, iNOS, reactive oxygen species, lipid peroxidation, and nitric oxide, in the TCx and Hp. We also found immunoreactivity to caspase-3 and a decrease of synaptophysin in the same brain regions. The results suggested that chronic consumption of alcohol in combination with ED causes an inflammatory response and oxidative stress, which induced cell death via apoptosis in the TCx and Hp of the adult rats

The effect of orthodontic forces on calcitonin gene-related peptide (CGRP) expression in the human periodontal ligament and its relationship with the human dental pulp

The purpose of this study was to quantify the effect of moderate and severe orthodontic forces on Calcitonin gene-related peptide (CGRP) expression in the healthy human periodontal ligament (PDL) and its possible relationship with the human dental pulp

Gemini multi-conjugate adaptive optics system review II: Commissioning, operation and overall performance

The Gemini Multi-conjugate Adaptive Optics System - GeMS, a facility instrument mounted on the Gemini South telescope, delivers a uniform, near diffraction limited images at near infrared wavelengths (0.95 microns- 2.5 microns) over a field of view of 120 arc seconds. GeMS is the first sodium layer based multi laser guide star adaptive optics system used in astronomy. It uses five laser guide stars distributed on a 60 arc seconds square constellation to measure for atmospheric distortions and two deformable mirrors to compensate for it. In this paper, the second devoted to describe the GeMS project, we present the commissioning, overall performance and operational scheme of GeMS. Performance of each sub-system is derived from the commissioning results. The typical image quality, expressed in full with half maximum, Strehl ratios and variations over the field delivered by the system are then described. A discussion of the main contributor to performance limitation is carried-out. Finally, overheads and future system upgrades are described.Comment: 20 pages, 11 figures, accepted for publication in MNRA