Noticias en español
Seminars appear in decreasing order in relation to date. To find an activity of your interest just go down on the list. Normally seminars are given in English. If not, they will be marked as Spanish Only.
Critical angles between two convex cones
In this talk we present a general theory of critical angles for a pair of closed convex cones via the optimization point of view. The angular analysis for a pair of specially structured cones will be also discussed. For instance, we work with linear subspaces, polyhedral cones, revolution cones, topheavy cones and cones of matrices. This is a joint work with Alberto Seeger.
Pre-service Elementary School Teachers’ Expectations about Student Performance: How their Beliefs are affected by their Mathematics Anxiety and Student’s Gender
Abstract Using a survey-experiment methodology we evaluate whether elementary school pre-service teachers’ beliefs about students’ future mathematics achievement, and general academic achievement, are influenced by teachers’ mathematics anxiety level, or by gender and socioeconomic status of the student. We found that mathematics anxiety can negatively influence pre-service elementary school teachers’ expectations about students, and that participants assign lower expectations of future mathematics achievement to girls than boys. The two...
Modeling, Simulation and Optimization of a Polluted Water Pumping Process in Open Sea
Abstract: Oil spill contamination in open sea has provoked some of the major environmental disaster in history. The ecological and economic impacts of such hazards are generally important and should be controlled as quickly as possible. One of the major cleaning techniques for these hazards is the use of skimmer ships. Those ships use various pumps distributed along the vessel perimeter to suck the oil from the surface of the water directly into storage units. In this work, we are interested in improving this process. To do so, we...
The usefulness of calmness in optimization
Abstract: The aim of this talk is to present the role that plays the calmness property in optimization, namely for the existence of KKT multipliers, subdifferential calculus, ….. A collection of sufficient conditions ensuring this property will be presented.
The Generalized Riemann problem as a building block for high-order finite volume methods}
Abstract The Godunov theorem provides a limitation for finite volume schemes, linear and monotone; only first order of accuracy can be achieved. A family of non-linear schemes, called ADER (Arbitrary accuracy DERivative Riemann problems), attempting to circumvent Godunov’s theorem, has been proposed. Building block for these schemes are: the polynomial reconstruction of cell averages and; the solution of special Cauchy problem, the so called generalized Riemann problems. The reconstruction and the solution of Generalized Riemann...
Variables asociadas al rendimiento escolar en matemáticas en ciclo inicial*
Resumen Se presentan antecedentes acerca de la incidencia de variables cognitivas como el nivel de desarrollo de las Competencias Matemáticas Tempranas (CMT) de tipo piagetiano-relacional y de tipo numérico, como también los niveles de inteligencia lógica inductiva y variables socio-afectivas como los factores de convivencia escolar y la predisposición hacia las tareas matemáticas sobre el rendimiento escolar en matemáticas. Existe evidencia de una relación inversa y significativa de la actitud desfavorable hacia las tareas matemáticas y...
Strict majority bootstrap percolation on augmented rings, tori and random regular graphs.
Abstract: We study the strict majority bootstrap percolation process on graphs. Vertices may be active or passive. Initially, active vertices are chosen independently with probability p. Each passive vertex v becomes active if at least ceil((deg(v)+1)/2) of its neighbors are active (and thereafter never changes its state). If at the end of the process all vertices become active then we say that the initial set of active vertices percolates on the graph. We address the problem of finding graphs for which percolation is likely to occur for...
“Evaluación entre pares en formación inicial de profesores de ciencias y matemáticas”
Abstract: La formación inicial de profesores está hoy más que nunca siendo mirada desde la política pública, la investigación en efectividad educativa y la sociedad. En este marco, varias investigaciones han indagado en distintas acciones que podrían conducir a mejores procesos y resultados en esta área. La evaluación formativa entre pares es el foco de este seminario. Una intervención basada en evaluación entre profesores en formación de último año fue el foco de este estudio. Participaron profesores de biología y ciencias, y profesores...
Exponential Familia Techniques for the Lognormal Left Tail
ABSTRACT: Sums of lognormals random variables arise in a wide variety of disciplines such as engineering, economics, insurance or nance, and are often employed in modeling across the sciences. Since the lognormal is subexponential and heavy-tailed, then the asymp- totic properties of the probability that the sum goes to in nity (right tail) are typically analyzed using subexponential techniques. In contrast, the study of the asymptotics of the probability that the sum becomes very small (left tail) is a light-tailed problem and the typical...
The Generalized Riemann problem as a building block for high-order finite volume methods
Abstract The Godunov theorem provides a limitation for finite volume schemes, linear and monotone; only first order of accuracy can be achieved. A family of non-linear schemes, called ADER (Arbitrary accuracy DERivative Riemann problems), attempting to circumvent Godunov’s theorem, has been proposed. Building block for these schemes are: the polynomial reconstruction of cell averages and; the solution of special Cauchy problem, the so called generalized Riemann problems. The reconstruction and the solution of Generalized Riemann...
