Search results for "matemática"
showing 10 items of 434 documents
Cluster values of holomorphic functions of bounded type
2015
We study the cluster value theorem for Hb(X), the Fréchet algebra of holomorphic functions bounded on bounded sets of X. We also describe the (size of) fibers of the spectrum of Hb(X). Our results are rather complete whenever X has an unconditional shrinking basis and for X = ℓ1. As a byproduct, we obtain results on the spectrum of the algebra of all uniformly continuous holomorphic functions on the ball of ℓ1. Fil: Aron, Richard Martin. Kent State University; Estados Unidos Fil: Carando, Daniel Germán. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Investigaciones Matemáticas ; Argentina Fil: Lassalle, S…
Analytical properties of horizontal visibility graphs in the Feigenbaum scenario
2012
Time series are proficiently converted into graphs via the horizontal visibility (HV) algorithm, which prompts interest in its capability for capturing the nature of different classes of series in a network context. We have recently shown [1] that dynamical systems can be studied from a novel perspective via the use of this method. Specifically, the period-doubling and band-splitting attractor cascades that characterize unimodal maps transform into families of graphs that turn out to be independent of map nonlinearity or other particulars. Here we provide an in depth description of the HV treatment of the Feigenbaum scenario, together with analytical derivations that relate to the degree di…
Structure of distributions generated by the scenery flow
2015
We expand the ergodic theory developed by Furstenberg and Hochman on dynamical systems that are obtained from magnifications of measures. We prove that any fractal distribution in the sense of Hochman is generated by a uniformly scaling measure, which provides a converse to a regularity theorem on the structure of distributions generated by the scenery flow. We further show that the collection of fractal distributions is closed under the weak topology and, moreover, is a Poulsen simplex, that is, extremal points are dense. We apply these to show that a Baire generic measure is as far as possible from being uniformly scaling: at almost all points, it has all fractal distributions as tangent …
HABILIDADES MATEMÁTICAS INICIALES Y DIFICULTADES MATEMÁTICAS PERSISTENTES
2017
Abstract.INITIAL MATH SKILLS AND PERSISTENT MATH DIFFICULTIESThe aim of the present study was to analyse the differences in certain basic mathematical competences (for example, counting, logical operations, magnitude comparability skills) assessed in. Early Childhood Education between children with persistent difficulties in the area of mathematics in 2nd Primary Education and children with adequate performance. The final sample of the study consisted of 180 children (composed initially of 209 pre-schoolers), of which 6.6% showed persistent mathematics difficulties (n = 12) and 45.5% presented an adequate performance in both measurements (n = 82). In Early Childhood Education we administere…
Latent force models for earth observation time series prediction
2016
We introduce latent force models for Earth observation time series analysis. The model uses Gaussian processes and differential equations to combine data driven modelling with a physical model of the system. The LFM presented here performs multi-output structured regression, adapts to the signal characteristics, it can cope with missing data in the time series, and provides explicit latent functions that allow system analysis and evaluation. We successfully illustrate the performance in challenging scenarios of crop monitoring from space, providing time-resolved time series predictions.
Polar motion prediction using the combination of SSA and Copula-based analysis
2018
The real-time estimation of polar motion (PM) is needed for the navigation of Earth satellite and interplanetary spacecraft. However, it is impossible to have real-time information due to the complexity of the measurement model and data processing. Various prediction methods have been developed. However, the accuracy of PM prediction is still not satisfactory even for a few days in the future. Therefore, new techniques or a combination of the existing methods need to be investigated for improving the accuracy of the predicted PM. There is a well-introduced method called Copula, and we want to combine it with singular spectrum analysis (SSA) method for PM prediction. In this study, first, we…
Un modelo no hidrostático global con coordenada vertical basada en altura
2015
Memoria presentada en la Universitat de València para optar grado de de Doctor Esta tesis documenta la investigación que he realizado en modelización atmosférica: se parte de las ecuaciones físicas de la atmósfera y se aplican métodos numéricos eficientes para encontrar una solución a dichas ecuaciones a partir de unas condiciones iniciales dadas. Para este fin, se ha desarrollado un modelo atmosférico cuyas características principales son: espectral en la representación horizontal de los campos, discretización vertical de alto orden de exactitud, y semi-implícito en la integración temporal. Además, el modelo es no hidrostático y tiene una coordenada vertical basada en altura, en vez de la …
Didáctica de la numeración en educación infantil: la metodología de algoritmos abiertos basados en números
2016
El presente Trabajo de Fin de Grado se centra en analizar los resultados extraídos de la implementación de una propuesta didáctica fundamentada en el método de algoritmos Abiertos Basados en Números (ABN). Ésta se llevó a cabo en un grupo de 22 alumnos de 5-6 años, en una escuela de titularidad pública y durante el curso escolar 2015-2016. Los objetivos que se plantearon fueron, por un lado, evaluar el desarrollo del sentido numérico en los participantes, y por otro lado, valorar si la enseñanza de la numeración y la aritmética básica, mediante una unidad didáctica sustentada en dicho método, conseguía adaptarse a la diversidad existente en el aula. Para ello, se realizó una observación del…
Diseño y aplicación de un instrumento para valorar la demanda cognitiva de problemas de matemáticas resueltos por estudiantes de enseñanza obligatori…
2018
Esta investigación está inducida por la necesidad de diseñar buenas prácticas docentes para atender a los estudiantes con altas capacidades matemáticas (aaccmm). Esta necesidad nos incitó a buscar una herramienta que dotara al profesorado de técnicas de intervención para la atención de este alumnado. Para ello, tratamos de utilizar el modelo de demanda cognitiva, considerado un instrumento relevante para la valoración de tareas. Las dificultades que encontramos cuando empezamos a aplicar dicho modelo en nuestras experimentaciones nos llevaron a mejorar el modelo de demanda cognitiva. En resumen, el objetivo general de esta investigación consiste en proporcionar una herramienta que permita a…
Analysis of the resolution processes of threemodeling tasks
2017
[EN] n this paper we present a comparative analysis of the resolution process of three modeling tasks per-formed by secondary education students (13-14 years), designed from three di erent points of view: TheModelling-eliciting Activities, the LEMA project, and the Realistic Mathematical Problems. The purposeof this analysis is to obtain a methodological characterization of them in order to provide to secondaryeducation teachers a proper selection and sequencing of tasks for their implementation in the classroom.