EFFETTO DELLA SOLLECITAZIONE MECCANICA A FLESSIONE SUL COMPORTAMENTO A CORROSIONE DI LEGHE DI Al STRUTTURALI

The present work reports on the effect of constant bending load on the electrochemical behavior of structural aluminum alloys AA 2024-T3 (Al-Cu-Mg) and AA 7075-T6 (Al-Zn-Mg-Cu). The single cycle anodic polarization curves in 0.6 M NaCl (pH 6.5) were carried out using four-point bent beam specimens (4PBB). Lower propensity to localized corrosion has been indicated for compressive stresses. The effect of tensile stresses on the electrochemical response is more complex and depends on the alloy nature

Oropouche virus cases identified in Ecuador using an optimised qRT-PCR informed by metagenomic sequencing

Oropouche virus (OROV) is responsible for outbreaks of Oropouche fever in parts of South America. We recently identified and isolated OROV from a febrile Ecuadorian patient, however, a previously published qRT-PCR assay did not detect OROV in the patient sample. A primer mismatch to the Ecuadorian OROV lineage was identified from metagenomic sequencing data. We report the optimisation of an qRT-PCR assay for the Ecuadorian OROV lineage, which subsequently identified a further five cases in a cohort of 196 febrile patients. We isolated OROV via cell culture and developed an algorithmically-designed primer set for whole-genome amplification of the virus. Metagenomic sequencing of the patient samples provided OROV genome coverage ranging from 68-99%. The additional cases formed a single phylogenetic cluster together with the initial case. OROV should be considered as a differential diagnosis for Ecuadorian patients with febrile illness to avoid mis-diagnosis with other circulating pathogens

The Lamé Class of Lorenz Curves.

In this paper, the class of Lamé Lorenz curves is studied. This family has the advantage of modeling inequality with a single parameter. The family has a double motivation: it can be obtain from an economic model and from simple transformations of classical Lorenz curves. The underlying cumulative distribution functions have a simple closed form, and correspond to the Singh-Maddala and Dagum distributions, which are well known in the economic literature. The Lorenz order is studied and several inequality and polarization measures are obtained, including Gini, Donaldson-Weymark-Kakwani, Pietra and Wolfson indices. Some extensions of the Lamé family are obtained. Fitting and estimation methods under two different data configuration are proposed. Empirical applications with real data are given. Finally, some relationships with other curves are included.The authors thank to Ministerio de Econom a y Competitividad, project ECO2010-15455, for partial support. The second author thanks to the Ministerio de Educaci on (FPU AP-2010-4907) for partial support. We are grateful for the constructive suggestions provided by the reviewers, which improved the paper

Redes neuronales y patrones de analogías aplicados al downscaling en modelos climáticos

Ponencia presentada en: I Congreso de la Asociación Española de Climatología “La climatología española en los albores del siglo XXI”, celebrado en Barcelona del 1 al 3 de diciembre de 1999.[ES]Este artículo describe un sistema experto para la simulación climática local utilizando las salidas de los modelos climáticos sobre un área limitada supra-peninsular y buscando analogías en las bases de datos de cada modelo. Éste conjunto de analogías entrena a una red neuronal sobre los datos locales de cualquier observatorio resultando un sistema objetivo para interpretar localmente las salidas de los modelos climáticos.[EN]This article describes an expert system for the climatic simulation using the low resolution outputs of the climatic models ver a supra-peninsular limited area and looking for similar configurations in the data bases of each model. These allow to train a neural net using the local data of any observatory as output. It provides an objective system in order to interpret the outputs of the climatic models locally

Language support for immigrant children: a study of state schools in the UK and US

In recent decades, immigrants, refugees and asylum seekers have sought a new way of life in large numbers, often leaving their countries of origin behind in search of places that offer a better way of life. The purpose of this study was to investigate how elementary and middle school students in state schools in Reading, England (primarily speakers of Asian languages), and Richmond, Virginia (primarily speakers of Spanish), were supported academically, when most children’s first language was not English. The authors were interested in exploring whether or not there were cultural or structural differences in the way each country helped or hindered these students as they progressed through the school systems. Three UK schools in a district of approximately 100,000 and three US schools in a district of approximately 250,000 were the focus of this exploration from 2000 to 2003. Findings indicated that there were cultural and legislative differences and similarities. Teachers and administrators in both countries attempted to provide services with limited and sometimes diminishing resources. Community support varied based on resources, attitudes toward various ethnic groups, and the coping strategies adopted by these groups in their new environments. Marked differences appeared with regard to the manner in which assessments took place and how the results were made available to the public

Prometeo: aplicación operativa de downscaling estadístico para la predicción de fenómenos locales

Ponencia presentada en: IV Congreso de la Asociación Española de Climatología "El Clima entre el Mar y la Montaña", celebrado en Santander del 2 al 5 de noviembre de 2004.Esta comunicación, describe el prototipo desarrollado en colaboración con el Instituto Nacional de Meteorología para la predicción local basada en técnicas híbridas de downscaling, que combinan la información procedente de los modelos numéricos, con la información climatológica procedente de observaciones de fenómenos meteorológicos. El prototipo se encuentra funcionando de forma operativa, de forma que los usuarios puedan acceder diariamente a las predicciones ofrecidas, de una forma interactiva. Además el sistema cuenta con la posibilidad de acceder a predicciones pasadas y concretamente acceder a los distintos índices de validación como la frecuencia climatológica de eventos tales como, Precipitación, Nieblas, Tormentas, Rachas Máximas, Temperaturas etc. Estas predicciones son ofrecidas en la red secundaria de estaciones, gestionada por Instituto Nacional de Meteorología, a partir de las observaciones realizadas por colaboradores

Aplicación de métodos de clasificación al downscaling estadístico

Ponencia presentada en: V Simposio Nacional de Predicción, celebrado en 2001 en Madrid.En este artículo se analizan diversas alternativas para la predicción probabilística de meteoros utilizando el método de análogos, y se presentan resultados de validación en la red principal de estaciones del INM en las diversas cuencas peninsulares. En primer lugar se comparan distintas especificaciones (tamaño de la rejilla y rango horario) del vector 4D que define el “estado de la atmósfera” en base a las predicciones de un modelo numérico. Seguidamente, se describe la forma más conveniente de comprimir esta información, eliminando redundancias, utilizando componentes principales. A continuación, se analizan distintas técnicas de clasificación para obtener un conjunto de estados de la atmósfera análogos a uno dado, de entre aquellos disponibles en una base de datos de estados históricos (reanálisis). Finalmente, se muestra la forma de mejorar la resolución de una predicción realizada por el modelo numérico a partir de la estadística de los meteoros locales observados en las fechas correspondientes a los análogos hallados para el estado definido por la predicción

Charge separation relative to the reaction plane in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}}= 2.76 TeV

Measurements of charge dependent azimuthal correlations with the ALICE detector at the LHC are reported for Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV. Two- and three-particle charge-dependent azimuthal correlations in the pseudo-rapidity range $|\eta| < 0.8$ are presented as a function of the collision centrality, particle separation in pseudo-rapidity, and transverse momentum. A clear signal compatible with a charge-dependent separation relative to the reaction plane is observed, which shows little or no collision energy dependence when compared to measurements at RHIC energies. This provides a new insight for understanding the nature of the charge dependent azimuthal correlations observed at RHIC and LHC energies.Comment: 12 pages, 3 captioned figures, authors from page 2 to 6, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/286

A note on comonotonicity and positivity of the control components of decoupled quadratic FBSDE

In this small note we are concerned with the solution of Forward-Backward Stochastic Differential Equations (FBSDE) with drivers that grow quadratically in the control component (quadratic growth FBSDE or qgFBSDE). The main theorem is a comparison result that allows comparing componentwise the signs of the control processes of two different qgFBSDE. As a byproduct one obtains conditions that allow establishing the positivity of the control process.Comment: accepted for publicatio