95 research outputs found
Excited States of Proton-bound DNA/RNA Base Homo-dimers: Pyrimidines
We are presenting the electronic photo fragment spectra of the protonated
pyrimidine DNA bases homo-dimers. Only the thymine dimer exhibits a well
structured vibrational progression, while protonated monomer shows broad
vibrational bands. This shows that proton bonding can block some non radiative
processes present in the monomer.Comment: We acknowledge the use of the computing facility cluster GMPCS of the
LUMAT federation (FR LUMAT 2764
Evaluación del grado de depresión de adultos mayores de 60 años del AA.HH “Viña alta” – La Molina, Lima-Perú.
OBJETIVODeterminar la prevalencia de depresión en Adultos Mayores de 60 años residentes en el Asentamiento Humano de “Viña Alta” de La Molina, durante el mes de Junio del 2010.MATERIAL Y MÉTODOEstudio de corte transversal tipo entrevista de carácter descriptivo, realizado durante la primera semana de Junio del 2010. Se realizaron visitas en todas las casas (280) de 18 de las 23 manzanas del asentamiento humano “Viña Alta” en la Molina. Se identificó a 112 adultos mayores de 60 años y se entrevistó a 68 de ellos, quienes fueron evaluados por los investigadores (previo entrenamiento) mediante la Escala de depresión geriátrica de Yesavage de 15 ítems (GDS-15).RESULTADOSLa edad media fue de 67,82 años (60-83) 53.3% fueron mujeres; el 51.67% presentó depresión en algún grado según el GDS-15; 33,3% eran analfabetos; y 70%, casados. Al contrastar los resultados del grado de depresión se verificó que no existían diferencias significativas en cuanto a género, grado de instrucción, edad y estado civil.CONCLUSIONESSe identificó una alta prevalencia de depresión (51.67%) que no estuvo asociada a ninguna de las variables del estudio
Apolipoprotein E and Alzheimer’s disease: The influence of apolipoprotein E on amyloid- and other amyloidogenic proteins
Power management and control strategies for off-grid hybrid power systems with renewable energies and storage
This document is the Accepted Manuscript of the following article: Belkacem Belabbas, Tayeb Allaoui, Mohamed Tadjine, and Mouloud Denai, 'Power management and control strategies for off-grid hybrid power systems with renewable energies and storage', Energy Systems, September 2017. Under embargo. Embargo end date: 19 September 2018. The final publication is available at Springer via https://doi.org/10.1007/s12667-017-0251-y.This paper presents a simulation study of standalone hybrid Distributed Generation Systems (DGS) with Battery Energy Storage System (BESS). The DGS consists of Photovoltaic (PV) panels as Renewable Power Source (RPS), a Diesel Generator (DG) for power buck-up and a BESS to accommodate the surplus of energy, which may be employed in times of poor PV generation. While off-grid DGS represent an efficient and cost-effective energy supply solution particularly to rural and remote areas, fluctuations in voltage and frequency due to load variations, weather conditions (temperature, irradiation) and transmission line short-circuits are major challenges. The paper suggests a hierarchical Power Management (PM) and controller structure to improve the reliability and efficiency of the hybrid DGS. The first layer of the overall control scheme includes a Fuzzy Logic Controller (FLC) to adjust the voltage and frequency at the Point of Common Coupling (PCC) and a Clamping Bridge Circuit (CBC) which regulates the DC bus voltage. A maximum power point tracking (MPPT) controller based on FLC is designed to extract the optimum power from the PV. The second control layer coordinates among PV, DG and BESS to ensure reliable and efficient power supply to the load. MATLAB Simulink is used to implement the overall model of the off-grid DGS and to test the performance of the proposed control scheme which is evaluated in a series of simulations scenarios. The results demonstrated the good performance of the proposed control scheme and effective coordination between the DGS for all the simulation scenarios considered.Peer reviewedFinal Accepted Versio
Evaluation de l'anisotropie de textures. Comparaison de méthodes appliquées à la caractérisation de matériaux
Cette contribution a pour objet de comparer l'efficacité des approches paramétriques et non-paramétriques en vue de caractériser des matériaux à partir de l'analyse texturale des images de microscope électronique par transmission. Dans le domaine non-paramétrique, c'est à dire sans modèle a priori, une approche ad-hoc basée sur la dispersion angulaire du gradient et une méthode basée sur l'analyse spectrale ont été développées. Pour la partie paramétrique, une modélisation à l'aide de coefficients de réflexion bidimensionnels obtenus par filtrage adaptatif linéaire bidimensionnel a été utilisée pour caractériser les différentes images de matériau
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