1,720,984 research outputs found
First Implementation of the WRF-CHIMERE-EDGAR Modeling System Over Argentina
No full textAir quality monitoring and research have been gaining importance in Argentina and Latin America, mainly in megacities where pollution reaches critical levels as in other places of the world. This work is a first attempt at simulating pollution levels at the country scale, in order to support air quality management and forecasting activities. We implemented the global scale inventory of anthropogenic emissions EDGAR v4.2 into the CHIMERE chemistry-transport model, driven by WRF meteorological fields, at a resolution of about 50 km, a performance evaluation of the modeling system is presented by the use of ground-based and satellite data. The lack of monitoring stations in the country constrained the evaluation to the March-May 2009 time period in three cities. We obtain a generally large underestimation of nitrogen oxides and particulate matter, but a good simulation of the daily cycles. The magnitude of pollution levels is underestimated probably because of the misrepresentation of the monitoring stations (sites heavily affected by local traffic) and of the coarse resolution of the model. Nitrogen dioxide tropospheric column obtained by the OMI sensor (onboard Aura/NASA) was used to evaluate spatial correspondence with the simulation outputs, revealing that spatial features are broadly captured by the model. Further work would imply an emission inventory refinement and the use of other satellite data available considering other periods of time; however, a more dense and representative air quality monitoring network throughout the country is very much needed
Cuenca Alta Río Neuquén. Provincia del Neuquén
Full text linkTesis de Maestría en Aplicaciones Espaciales de Alerta y Respuesta Temprana a EmergenciasLaposibilidad de obtener la variaci ́on estacional de la cobertura de nieve en ́areas andinas es importante para estudios hidrol ́ogicos as ́ı como para una adecuada planificaci ́on del recurso agua en cuanto a riego, abastecimiento, tenuaci ́on de crecidas e hidroelectricidad. Los sensores remotos que trabajan en el rango de longitud de onda del visible e infrarroja son una herramienta operativa para el monitoreo de la nieve en condiciones libres de nubosidad. Los sat ́elites a microondas son capaces de obtener datos independientemente de las condiciones ambientales. Mas aun, la ventaja en el uso de im ́agenes provenientes de radares redunda en su capacidad para obtener par ́ametros altamente importantes para mejorar los modelos de predicci ́on, como la humedad de la nieve, su profundidad, densidad y equivalente de agua en nieve. En este trabajo, se analiza una secuencia de im ́agenes ERS-2 de la regi ́on cordillerana de la Patagonia Argentina, con el objetivo de obtener cartograf ́ıa de nieve h ́umeda y seca mediante mejoras a metodos implementados anteriormente. Asimismo, dichos resultados se validan con datos provenientes de sensores ́opticos asi como tambi ́en a partir de la interpretacion de variables topográficas que influyan en la distribuci ́on espacial de la nieve humed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Análisis ecológico de la ocurrencia de casos de hidatidosis en la Provincia de Río Negro
Full text linkLa Hidatidosis, es una zoonosis parasitaria, endémica en la provincia de Río Negro. Las áreas geográficas de mayor riesgo están ubicadas al oeste y al centro de la provincia, en donde las condiciones ecológicas favorecen la sobrevida de huevos de Echinococcus granulosus y las condiciones sociales, culturales y económicas generan un ambiente epidemiológico que favorecen el ciclo de transmisión. En este estudio se evalúa la relación entre la distribución geográfica de la tasa de hidatidosis en niños y factores de riesgo ambientales y climáticos como temperatura, vegetación y regiones naturales. Para tal fin se emplearon modelos espaciales de Poisson de efectos fijos y mixtos. La temperatura media anual de la superficie terrestre y el Índice de Vegetación de Diferencia Normalizada, influyeron en forma negativa, y la región ecológica Patagonia Extra Andina Occidental en forma positiva, sobre la razón de morbilidad estandarizada de hidatidosis en chicos de 0 a 14 años. Cuando se evalúa la temperatura por rangos, la correlación se obtuvo con el intervalo de 17.19 a 20.90 °C. Las covariables mencionadas explicaron en parte la distribución de casos en el área de estudio mediante el modelo de efectos fijos, presentando sobredispersión. Modelos jerárquicos Bayesianos espaciales de efectos mixtos modelaron la sobredispersión mediante la incorporación de efectos aleatorios estructurados y no estructurados en el espacio, favoreciendo la bondad de ajuste y el potencial de predicción del modelo. La descomposición del riesgo relativo indicó que los radios censales ubicados al centro-sur y sur-oeste provincial fueron explicados por efectos fijos, mientras el riesgo relativo del radio censal n° 4, ubicado en el centro-norte, es debido a efectos aleatorios no estructurados en el espacio. Los modelos desarrollados podrían ser utilizados para predecir la distribución de casos en el área programa Hidatidosis
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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