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Search Results: 1 - 10 of 937 matches for " Matilde Nicolini "
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Verificación de los pronosticos del modelo BRAMS centrado en la region subtropical de Sudamerica BRAMS forecast verification over a region of subtropical Southamerica
Yanina García Skabar,Paola Salio,Matilde Nicolini
Revista Brasileira de Meteorologia , 2012, DOI: 10.1590/s0102-77862012000300004
Abstract: El objetivo del presente trabajo es realizar una verificación de los pronósticos generados en el Departamento de Ciencias de la Atmósfera y los Océanos de la Universidad de Buenos Aires con el modelo Brazilian Regional Atmospheric Modeling System(BRAMS). Utilizando dicho modelo, desde 2006, se realizan dos pronósticos al día por un plazo de 72 horas en dos retículas anidadas con una resolución horizontal de 80 y 20km. La retícula de mayor resolución abarca Paraguay, Uruguay, Sur de Brasil y Bolivia y el centro y norte de Argentina y Chile. En este trabajo se realiza la verificación sobre el dominio de mayor resolución para el período desde abril de 2006 a diciembre de 2008. El interés se centra en verificar los pronósticos de precipitación, y de los perfiles verticales de temperatura, humedad y viento en las localidades donde se dispone de datos de radiosondeos. La verificación de los pronósticos de precipitación se realiza mediante estadísticos calculados frente a las observaciones convencionales disponibles y frente a estimaciones de precipitación CMORPH. Los resultados son similares a los obtenidos en la región con modelos de aproximadamente la misma resolución. Además se identifican las deficiencias principales de los pronósticos lo que permitirá realizar ajustes en la configuración del mismo para mejorar su desempe o. The aim of this work is to verify the forecasts generated in the Department of Atmospheric Sciences and Ocean, University of Buenos Aires with the Brazilian model Regional Atmospheric Modeling System (BRAMS). Since year 2006, every day two different forecasts that extend for 72 hours have been performed using two nested grids with an horizontal resolution of 80 and 20 km. The higher resolution domain covers Paraguay, Uruguay, southern Brazil and Bolivia and the central and northern part of Argentina and Chile. This paper presents the results of the verification of the model in the higher resolution domain for the period April 2006 to December 2008. The focus is in the precipitation and vertical profiles of temperature and wind forecasts in the locations where soundings are available. Verification of precipitation forecast is based on statistics computed against observations and precipitation estimates from CMORPH. The results are close to those obtained in the region with models of similar resolution. It is also possible to identify the main forecast deficiencies, contributing to future adjustments in its configuration to improve the model performance.
Teamwork at University in Spain: The Importance of Foreign Students  [PDF]
Rosella Nicolini
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.62011
Abstract: This study discusses the experience of the implementation of a peer-norm in reducing free riding and conflict problems in teamwork activities. This exploratory experiment is run with two cohorts of students in one of the principal Spanish universities. The educational problem is to control for student potential collusion (with clear free riding episodes) in homework projects performed by assigned groups. The peer-norm intends to control for it. The empirical analysis identifies that the success of this norm is associated with the presence of foreign students. Empirically, the presence of foreign students in each cohort brings an educational and cultural background different from the natives’ one. Their presence in work groups turns out to be the key factor to reduce potentially the degree of collusion in the overall cohort because they seem to be less concerned by the “social retaliation” of the mates.
Nevadas en el Sudeste Bonaerense: climatología sinóptica y un caso de estudio
Salio,Paola; Campetella,Claudia; Ruiz,Juan; Garcia Skabar,Yanina; Nicolini,Matilde;
Meteorologica , 2006,
Abstract: this paper presents a statistic of the frequency of snow-fall occurred over the southeast of buenos aires province over a 35 year period (1960-2004). considering present weather information 32 events were found and only 7 events show snow over more than one synoptic station. a synoptic climatology of the cold air incursions that are responsible for snow-fall in the study region is shown in order to understand the circulation patterns. atmospheric circulation patterns are characterized by extreme anomalies linked to the trough associated to cold front and the ridge in post-frontal areas that denote the intensity of these systems,. the anomalies field of geopotencial height shows a negative extreme over the frontal trough in the cases of generalized snow duplicate the intensity in cases with isolated snow. the intense cyclonic regime favors the convergence at low levels and the strong cooling, evident in the anomalies of temperature at mid-levels, indicating the instability generated in the air mass that is lead towards the northern patagonian coast and the argentinean sea. a case study of a generalized snow-fall related to a strong cold air incursion occurred on 10 july 2004 over the southeast coast of the buenos aires province. the synoptic situation is analyzed in relation to the long period sample and the polar air mass evolution is characterized using rams model in a diagnostic mode. the snow-fall is related to a persistent destabilization favored by heating and moisturizing in a prevalently maritime trajectory and by convergence in a cyclonic regime.
Análisis del entorno sinóptico asociado con eventos de Bow-Echo en la Provincia de Buenos Aires
Torres Brizuela,Marcela; Vidal,Ricardo; García Skabar,Yanina; Nicolini,Matilde; Vidal,Luciano;
Meteorologica , 2011,
Abstract: during the morning hours on october 21 2008, three convective lines developed over the buenos aires province, and were captured by the meteorological radars located at ezeiza and pergamino. the spatial structure and temporal evolution of the reflectivity field of these convective systems present the attributes of the particular convective system referred to as a “bow-echo”. ezeiza doppler radar images, captured winds stronger than 20 m.s-1 behind these arc lines, a phenomenon that frequently characterizes the presence of a bow-echo. the main objective of this study is to understand the synoptic weather conditions accompanying the occurrence of these bow echo events to enhance the weather forecasting of these systems. on this particular case the specific humidity field over the northern part of the buenos aires province (q≥ 12-14 g.kg-1) and also the environmental vertical wind shear values below 700 hpa meet the required conditions to develop a bow-echo event, although the available surface level cape values do not promote this event.
Análisis del entorno sinóptico asociado con eventos de Bow-Echo en la Provincia de Buenos Aires Synoptic Environment Analysis Associated With Bow - Echo Events In The Province Of Buenos Aires
Marcela Torres Brizuela,Ricardo Vidal,Yanina García Skabar,Matilde Nicolini
Meteorologica , 2011,
Abstract: Durante la madrugada del día 21 de Octubre de 2008 se desarrollaron tres líneas convectivas en la provincia de Buenos Aires, captadas por los radares meteorológicos de las localidades de Ezeiza y Pergamino. La estructura espacial y evolución temporal del campo de reflectividad de estos sistemas, configuración de línea en arco, responde al modo convectivo conocido con el nombre de “bow-echo”. La imagen doppler del radar de Ezeiza registró un fenómeno típico en la parte posterior de estas líneas en arco: los vientos intensos mayores a 20 m.s-1. El objetivo principal de este estudio es comprender las condiciones sinópticas que acompa aron la ocurrencia de estos sistemas para poder contribuir al pronóstico de su ocurrencia. En este evento las condiciones de humedad especifica en la zona del norte de la provincia de Buenos Aires (q≥ 12-14 g.kg-1), así como la de cortante vertical del viento por debajo del nivel de 700 hPa (Us>15 m.s-1) coinciden en indicar al entorno como favorable al desarrollo del mismo, aunque no así los valores disponibles de CAPE evaluados para parcelas que se elevan desde superficie. During the morning hours on October 21 2008, three convective lines developed over the Buenos Aires province, and were captured by the meteorological radars located at Ezeiza and Pergamino. The spatial structure and temporal evolution of the reflectivity field of these convective systems present the attributes of the particular convective system referred to as a “bow-echo”. Ezeiza doppler radar images, captured winds stronger than 20 m.s-1 behind these arc lines, a phenomenon that frequently characterizes the presence of a bow-echo. The main objective of this study is to understand the synoptic weather conditions accompanying the occurrence of these bow echo events to enhance the weather forecasting of these systems. On this particular case the specific humidity field over the northern part of the Buenos Aires province (q≥ 12-14 g.kg-1) and also the environmental vertical wind shear values below 700 hPa meet the required conditions to develop a bow-echo event, although the available surface level CAPE values do not promote this event.
Construct Validation by Hierarchical Bayesian Concept Maps: An Application to the Transaction Cost Economics Theory of the Firm  [PDF]
Matilde Trevisani
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.87079
Abstract: A concept map is a diagram depicting relationships among concepts which is used as a knowledge representation tool in many knowledge domains. In this paper, we build on the modeling framework of Hui et al. (2008) in order to develop a concept map suitable for testing the empirical evidence of theories. We identify a theory by a set of core tenets each asserting that one set of independent variables affects one dependent variable, moreover every variable can have several operational definitions. Data consist of a selected sample of scientific articles from the empirical literature on the theory under investigation. Our “tenet map” features a number of complexities more than the original version. First the links are two-layer: first-layer links connect variables which are related in the test of the theory at issue; second-layer links represent connections which are found statistically significant. Besides, either layer matrix of link-formation probabilities is block-symmetric. In addition to a form of censoring which resembles the Hui et al. pruning step, observed maps are subject to a further censoring related to second-layer links. Still, we perform a full Bayesian analysis instead of adopting the empirical Bayes approach. Lastly, we develop a three-stage model which accounts for dependence either of data or of parameters. The investigation of the empirical support and consensus degree of new economic theories of the firm motivated the proposed methodology. In this paper, the Transaction Cost Economics view is tested by a tenet map analysis. Both the two-stage and the multilevel models identify the same tenets as the most corroborated by empirical evidence though the latter provides a more comprehensive and complex insight of relationships between constructs.
Qual será o futuro dasfábricas de administradores?
Nicolini, Alexandre;
Revista de Administra??o de Empresas , 2003, DOI: 10.1590/S0034-75902003000200003
Abstract: the under-graduate level teaching of business management is, in brazil, a fairly recent event. given the importance of this field of knowledge as a strategic tool for the development of the nation and its organizations, an investigation into the public policies regarding the teaching of business management becomes highly necessary. this paper seeks to analyze the policies which have already been implemented and those that are now being proposed by the comiss?o de especialistas de ensino de administra??o (commission of specialists of business management study), as seen through the eyes of highly acknowledged educators who are deeply committed to the development of the nation.
Noncommutative Black Holes, The Final Appeal To Quantum Gravity: A Review
Nicolini, Piero
High Energy Physics - Phenomenology , 2008,
Abstract: We present the state of the art regarding the relation between the physics of Quantum Black Holes and Noncommutative Geometry. We start with a review of models proposed in the literature for describing deformations of General Relativity in the presence of noncommutativity, seen as an effective theory of Quantum Gravity. We study the resulting metrics, proposed to replace or at least to improve the conventional black hole solutions of Einstein's equation. In particular, we analyze noncommutative-inspired solutions obtained in terms of quasi-classical noncommutative coordinates: indeed because of their surprising new features, these solutions enable us to circumvent long standing problems with Quantum Field Theory in Curved Space and to cure the singular behavior of gravity at the centers of black holes. As a consequence, for the first time, we get a complete description of what we may call the black hole SCRAM, the shut down of the emission of thermal radiation from the black hole: in place of the conventional scenario of runaway evaporation in the Planck phase, we find a zero temperature final state, a stable black hole remnant, whose size and mass are determined uniquely in terms of the noncommutative parameter $\theta$. This result turns out to be of vital importance for the physics of the forthcoming experiments at the LHC, where mini black hole production is foreseen in extreme energy hadron collisions. Because of this, we devote the final part of this review to higher dimensional solutions and their phenomenological implications for TeV Gravity.
Comercio internacional y política económica de la Unión Europea: Aportaciones prácticas. Comer internacional i política econòmica de la Unió Europea: aportacions pràctiques International Commerce and Economic Policies of the European Union. Practical Contributions
Rosella Nicolini
@tic : Revista d'Innovació Educativa , 2009, DOI: 10.7203/attic.3.137
Abstract: En el actual plan de estudios figuran asignaturas bajo el epígrafe de Comercio internacional en el segundo ciclo, y Economía mundial (internacional) en el primer a o del primer ciclo. Existen manuales de referencia que proporcionan un temario muy completo, pero, a veces, con pocos ejemplos y aplicaciones prácticas. Mi propuesta docente es ofrecer un programa en el que se complementen los conceptos teóricos con cuestiones más aplicadas que giren entorno a las políticas económicas referidas a la integración Europea. Adicionalmente cabe destacar que las aportaciones son más evidentes e impactantes a la hora de abordar las teorías del comercio internacional bajo condiciones de competencia imperfecta. International Commerce and Economic Policies of the European Union. Practical Contributions
Perspectivas futuras da genética psiquiátrica
Nicolini Humberto
Revista Brasileira de Psiquiatria , 1999,
Abstract:
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