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Nomenclatura Unesco > (12) Matemáticas

Mostrando recursos 101 - 120 de 31,396

101. Computación evolutiva de bosques de expansión mínimos con restricción de grado y de rol - Antón Sánchez, Laura
Encontrar el árbol de expansión mínimo con restricción de grado de un grafo (DCMST por sus siglas en inglés) es un problema NP-complejo ampliamente estudiado. Una de sus aplicaciones más importantes es el dise~no de redes. Aquí nosotros tratamos una nueva variante del problema DCMST, que consiste en encontrar el árbol de expansión mínimo no solo con restricciones de grado, sino también con restricciones de rol (DRCMST), es decir, a~nadimos restricciones para restringir el rol que los nodos tienen en el árbol. Estos roles pueden ser nodo raíz, nodo intermedio o nodo hoja. Por otra parte, no limitamos el número de nodos raíz a uno, por lo...

102. Random positioning of dendritic spines in the human cerebral cortex - Morales del Olmo, Juan; Benavides Piccione, Ruth; Dar, Mor; Fernaud, Isabel; Rodríguez Martínez de Bartolomé, Ángel; Antón Sánchez, Laura; Bielza Lozoya, Maria Concepcion; Larrañaga Múgica, Pedro; Felipe Oroquieta, Javier de; Yuste, Rafael
Dendritic spines establish most excitatory synapses in the brain and are located in Purkinje cell?s dendrites along helical paths, perhaps maximizing the probability to contact different axons. To test whether spine helixes also occur in neocortex, we reconstructed ?500 dendritic segments from adult human cortex obtained from autopsies. With Fourier analysis and spatial statistics, we analyzed spine position along apical and basal dendrites of layer 3 pyramidal neurons from frontal, temporal, and cingulate cortex. Although we occasionally detected helical positioning, for the great majority of dendrites we could not reject the null hypothesis of spatial randomness in spine locations, either...

103. Interval-based ranking in noisy evolutionary multiobjective optimization - Karshenas, Hossein; Bielza Lozoya, Maria Concepcion; Larrañaga Múgica, Pedro
As one of the most competitive approaches to multi-objective optimization, evolutionary algorithms have been shown to obtain very good results for many realworld multi-objective problems. One of the issues that can affect the performance of these algorithms is the uncertainty in the quality of the solutions which is usually represented with the noise in the objective values. Therefore, handling noisy objectives in evolutionary multi-objective optimization algorithms becomes very important and is gaining more attention in recent years. In this paper we present ?-degree Pareto dominance relation for ordering the solutions in multi-objective optimization when the values of the objective functions...

104. Desenvolvimento psicomotor e competência matemática : estudo da relação entre esquema corporal, estruturação temporal, percepção visual e habilidades matemáticas precoces em crianças em idade escolar. - Patrício, Elisabete Maria Antunes
Mestrado em Educação Especial

105. Multiple orthogonal polynomials of mixed type: Gauss-Borel factorization and the multi-component 2D Toda hierarchy - Álvarez Fernández, Carlos; Fidalgo Prieto, Ulises; Mañas Baena, Manuel
Multiple orthogonality is considered in the realm of a Gauss-Borel factorization problem for a semi-infinite moment matrix. Perfect combinations of weights and a finite Borel measure are constructed in terms of M-Nikishin systems. These perfect combinations ensure that the problem of mixed multiple orthogonality has a unique solution, that can be obtained from the solution of a Gauss-Borel factorization problem for a semi-infinite matrix, which plays the role of a moment matrix. This leads to sequences of multiple orthogonal polynomials, their duals and second kind functions. It also gives the corresponding linear forms that are bi-orthogonal to the dual linear...

106. Riemann–Hilbert problems, matrix orthogonal polynomials and discrete matrix equations with singularity confinement - Cassatella-Contra, Giovanni A.; Mañas Baena, Manuel
n this paper, matrix orthogonal polynomials in the real line are described in terms of a RiemannHilbert problem. This approach provides an easy derivation of discrete equations for the corresponding matrix recursion coefficients. The discrete equation is explicitly derived in the matrix Freud case, associated with matrix quartic potentials. It is shown that, when the initial condition and the measure are simultaneously triangularizable, this matrix discrete equation possesses the singularity confinement property, independently if the solution under consideration is given by the recursion coefficients to quartic Freud matrix orthogonal polynomials or not.

107. Ecuaciones Diferenciales II - Mañas Baena, Manuel; Martínez Alonso, Luis
En este manual se revisan diferentes aspectos sobre las ecuaciones diferenciales en derivadas parciales de utilidad para los físicos. Se elaboraron como notas de clase de la asignatura Ecuaciones II, del plan 1993 de la Licenciatura de Física de la UCM. Actualmente cubre un 75% de la asignatura Métodos Matemáticos II del Grado de Física de la UCM.

108. Orthogonal Laurent polynomials on the unit circle, extended CMV ordering and 2D Toda type integrable hierarchies - Álvarez Fernández, Carlos; Mañas Baena, Manuel
We connect the theory of orthogonal Laurent polynomials on the unit circle and the theory of Toda-like integrable systems using the Gauss-Borel factorization of a Cantero-Moral-Velazquez moment matrix, that we construct in terms of a complex quasi-definite measure supported on the unit circle. The factorization of the moment matrix leads to orthogonal Laurent polynomials on the unit circle and the corresponding second kind functions. We obtain Jacobi operators, 5-term recursion relations, Christoffel-Darboux kernels, and corresponding Christoffel-Darboux formulas from this point of view in a completely algebraic way. We generalize the Cantero- Moral-Velazquez sequence of Laurent monomials, recursion relations, Christoffel-Darboux kernels,...

109. Matrix orthogonal laurent polynomials on the unit circle and toda type integrable systems - Ariznabarreta, Gerardo; Mañas Baena, Manuel
Matrix orthogonal Laurent polynomials in the unit circle and the theory of Toda-like integrable systems are connected using the Gauss–Borel factorization of two, left and a right, Cantero–Morales–Velázquez block moment matrices, which are constructed using a quasi-definite matrix measure. A block Gauss–Borel factorization problem of these moment matrices leads to two sets of biorthogonal matrix orthogonal Laurent polynomials and matrix Szegő polynomials, which can be expressed in terms of Schur complements of bordered truncations of the block moment matrix. The corresponding block extension of the Christoffel–Darboux theory is derived. Deformations of the quasidefinite matrix measure leading to integrable systems of...

110. Resultados sobre problemas elípticos en dominios simétricos o no simétricos - Lopera Arias, Emer de Jesús
En esta tesis se estudian tres problemas de tipo semipositone, uno de ellos en un dominio acotado N-dimensional, y los otros dos en dominios simétricos. El operador diferencial involucrado en todos los casos es el p-Laplaciano

111. Técnica de aclaramiento para dientes tratados endodónticamente con antecedentes de trauma dentoalveolar - reporte de caso - Mariño Poveda, Adriana Carolina
La pigmentación, de un diente anterior no vital es una preocupación estética común para muchos pacientes. Los dientes no vitales con decoloración están comprometidos, debido a un trauma previo, caries y endodoncia. Las opciones de tratamiento rehabilitador son invasivas y debilitan la estructura dental remanente, cuestionando la viabilidad a largo plazo del diente. Este documento analiza un enfoque más conservador para el tratamiento de los dientes con decoloración. El caso clínico presenta una técnica de aclaramiento dentro / fuera de la corona dental, utilizando la técnica de aclaramiento ambulatoria, para aclaramiento dental interno, con perborato de sodio mezclado con peróxido de hidrogeno al 30% como agente aclarante y peróxido...

112. Fondamenti di geometria a più dimensioni e a più specie di unità rettilinee esposti in forma elementare: lezioni per la scuola di magistero in matematica - Veronese, Giuseppe

113. CÁLCULO ESTOCÁSTICO EN FINANZAS: APLICACIÓN DEL MODELO BROWNIANO GEOMÉTRICO PARA LA PREDICCIÓN DEL ACTIVO SUBYACENTE FCC.MC EN EL IBEX-35 - PÉREZ FERNÁNDEZ, DANIEL
[ES] En base a la coyuntura económica (aumento de la capitalización en las bolsas y disminución de la rentabilidad de la renta fija) es un buen momento para invertir en activos cotizados (renta variable). En este TFG se estudiará un modelo estocástico denominado, modelo Log-Normal o también Modelo Browniano Geométrico, y se aplicará a la modelización de la dinámica temporal del activo subyacente FCC.MC del IBEX-35. El estudio permitirá obtener predicciones del valor de la acción FCC.MC a corto plazo a partir de una serie histórica. Para la aplicación del modelo es necesario estimar previamente los parámetros del mismo, para lo...

114. Padrões nutricionais para lavouras arrozeiras irrigadas por inundação pelos métodos da CDN e chance matemática - Wadt, Paulo Guilherme Salvador; Anghinoni, Ibanor; Guindani, Raquel Hermann Pötter; Lima, André Suêldo Tavares de; Puga, Aline Peregrina; Silva, Gilson Silvério da; Prado, Renato de Mello
Para o arroz irrigado, poucos trabalhos utilizam métodos de diagnose foliar desenvolvidos para as condições locais de clima, solo ou cultivares. O objetivo deste trabalho foi avaliar os métodos da Diagnose da Composição Nutricional e da Chance Matemática na definição dos padrões nutricionais de lavouras arrozeiras do Estado do Rio Grande do Sul. Resultados de produtividade de grãos e teores foliares de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Zn e Mo de 356 lavouras arrozeiras cultivadas sob sistema de irrigação por inundação foram utilizados para a determinação das faixas de suficiência calculadas pelo método da Chance...

115. 1/f^(α) Noise and integrable systems - Barba, J. C:; Finkel Morgenstern, Federico; González López, Artemio; Rodríguez González, Miguel Ángel
In this paper, we show that there is a family of well-known integrable systems whose spectral fluctuations decay as 1/ f^ 4, and thus do not follow the 1/ f ^2 law recently conjectured for integrable systems. We present a simple theoretical justification of this fact, and propose an alternative characterization of quantum chaos versus integrability formulated directly in terms of the power spectrum of the spacings of the unfolded spectrum.

116. Quasi-exactly solvable n-body spin hamiltonians with short-ange interaction potentials - Enciso, Alberto; Finkel Morgenstern, Federico; González López, Artemio; Rodríguez González, Miguel Ángel
We review some recent results on quasi-exactly solvable spin models presenting near-neighbors interactions. These systems can be understood as cyclic generalizations of the usual Calogero-Sutherland models. A nontrivial modification of the exchange operator formalism is used to obtain several infinite families of eigenfunctions of these models in closed form.

117. Quasi-exactly solvable potentials on the line and orthogonal polynomials - Finkel Morgenstern, Federico; González López, Artemio; Rodríguez González, Miguel Ángel
In this paper we show that a quasi-exactly solvable (normalizable or periodic) one-dimensional Hamiltonian satisfying very mild conditions defines a family of weakly orthogonal polynomials which obey a three-term recursion relation. in particular, we prove that (normalizable) exactly solvable one-dimensional systems are characterized by the fact that their associated polynomials satisfy a two-term recursion relation. We study the properties of the family of weakly orthogonal polynomials defined by an arbitrary one-dimensional quasi-exactly solvable Hamiltonian, showing in particular that its associated Stieltjes measure is supported on a finite set. From this we deduce that the corresponding moment problem is determined, and...

118. Quasi-exactly solvable spin 1/2 Schrödinger operators - Finkel Morgenstern, Federico; González López, Artemio; Rodríguez González, Miguel Ángel
The algebraic structures underlying quasi-exact solvability for spin 1/2 Hamiltonians in one dimension are studied in detail. Necessary and sufficient conditions for a matrix second-order differential operator preserving a space of wave functions with polynomial components to be equivalent to a Schrodinger operator are found. Systematic simplifications of these conditions are analyzed, and are then applied to the construction of new examples of multi-parameter QES spin 1/2 Hamiltonians in one dimension.

119. On the construction of evolution equations admitting a master symmetry - Finkel Morgenstern, Federico; Fokas, A. S.
A method for constructing evolution equations admitting a master symmetry is proposed. Several examples illustrating the method are presented. It is also noted that for certain evolution equations master symmetries can be useful for obtaining new conservation laws from a given one.

120. Aplicación de la estadística funcional en el estudio de algunos atributos hidrofísicos del suelo - Cortés Delgadillo, Diego Leonardo
El conocimiento de los suelos agrícolas es el factor predominante para el desarrollo óptimo de las actividades agropecuarias. Usualmente su estudio inicia con el análisis de datos obtenidos a partir del muestreo en un conjunto finito de sitios dentro de la región de interés. Las variables medidas en cada sitio pueden ser escalares (propiedades químicas) o funcionales (p.e., curvas de infiltración (Ia), de resistencia mecánica a la penetración (RP) o de retención de agua (CRA)). En este trabajo se hizo el análisis de datos de un Andisol, RP en un Oxisol y CRA en los dos tipos de suelo, en...

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