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Nomenclatura Unesco > (12) Matemáticas

Mostrando recursos 81 - 100 de 31,680

81. Green matrices of weighted graphs with pendant vertices - Gago Álvarez, Silvia
Postprint (published version)

82. Interoperating between Computer Algebra systems: computing homology of groups with Kenzo and GAP - Ana Romero; Dpto De Matemáticas Y; Graham Ellis; Julio Rubio
In this paper we report on an experience communicating two computer algebra systems, namely GAP (and more con-cretely, its HAP package to compute in Homological Alge-bra) and Kenzo (to compute in Algebraic Topology). Both systems cooperate through an OpenMath link in computing homology of groups. In addition, once the output from HAP has been integrated in Kenzo, it can be used to compute more complicated algebraic invariants, as homology groups of some 2-types.

83. 4 Instituto de Matemática, Universidade Federal do Rio Grande do Sul, Porto Alegre, - S. C. Fuchs; Sandra Costa Fuchs; Leila Beltrami Moreira; Susi Alves Camey; Flávio Danni Fuchs
Clustering of risk factors for cardiovascular disease among women in Southern Brazil: a population-based study Agregação de fatores de risco para doenças cardiovasculares em mulheres no Sul do Brasil: um estudo de base populacional 1 Faculdade de Medicina,

84. Sistema para interpretação e análise de qualidade de água - Spengler, Tiago; Moreira, Fabio Osorio

85. Estudo para soluções de equações diferenciais parciais em geometria não regulares - Fantin, Ana Lucia Vieira; Cunha, Rudnei Dias da; Zingano, Paulo Ricardo de Avila

86. Application of global numerical procedures to the analysis of shells - Samartín, Avelino
Examples of global solutions of the shell equations are presented, such as the ones based on the well known Levy series expansion. Also discussed are some natural extensions of the Levy method as well as the inherent limitations of these methods concerning the shell model assumptions, boundary conditions and geometric regularity. Finally, some open additional design questions are noted mainly related to the simultaneous use in analysis of these global techniques and the local methods (like the finite elements) to finding the optimal shell shape, and to determining the reinforcement layout.

87. Resolución numérica de un problema de valor óptimo de una opción - Bermúdez de Castro López Varela, Alfredo; Moreno González, Carlos; Samartín, Avelino
The option value problem with two costs is written as a variational inequality. The advantage of this formulation is that it takes place in a fixed domain. Thus no front tracking is needed for numerical approximation of the free boundary. An iterative algorithm is proposed which can be used to solve the nonlinear system obtained by finite differences or finite elements procedures. Especial care has to be taken in the design of differences finites schemes o finite elements due to the degeneracy of the differential operator. These schemes can be absortion or convection dominated nearly to the axis. This is...

88. O Delicious, as redes sociais e a matemática - Torres, João

89. Assessing the impact of the CPU power-saving modes on the task-parallel solution of sparse linear systems - Aliaga, José Ignacio; Barreda, María; Dolz, Manuel F.; Martín Huertas, Alberto Francisco; Mayo, Rafael; Quintana Ortí, Enrique Salvador
We investigate the benefits that an energy-aware implementation of the runtime in charge of the concurrent execution of ILUPACK—a sophisticated preconditioned iterative solver for sparse linear systems—produces on the time-power-energy balance of the application. Furthermore, to connect the experimental results with the theory, we propose several simple yet accurate power models that capture the variations of average power that result from the introduction of the energy-aware strategies as well as the impact of the P-states into ILUPACK’s runtime, at high accuracy, on two distinct platforms based on multicore technology from AMD and Intel.

90. Caracterización dinámica del glaciar Hurd combinando observaciones de campo y simulaciones numéricas - Molina Castiella, María Carmen
El objetivo fundamental de esta tesis es la caracterización de la morfología y del estado de deformaciones y tensiones del Glaciar Hurd (Isla Livingston, Archipiélago de las Shetland del Sur, Antártida), mediante una combinación de observaciones de campo, registros de georradar y simulaciones numéricas. La morfología y el estado de deformaciones y tensiones actuales son la expresión de la evolución dinámica del glaciar desde tiempos pretéritos hasta recientes, y su análisis nos dará las pautas con las cuales ser capaces de predecir, con el apoyo de las simulaciones numéricas, su evolución futura. El primer aspecto que se aborda es el...

91. Entanglement and symmetry in quantum many body systems - González Guillén, Carlos Eduardo

92. Betweenness Centrality in Graphs - Gago Álvarez, Silvia; Coronicová Hurajová, Jana; Madaras, Tomas
The first book devoted exclusively to quantitative graph theory, Quantitative Graph Theory: Mathematical Foundations and Applications presents and demonstrates existing and novel methods for analyzing graphs quantitatively. Incorporating interdisciplinary knowledge from graph theory, information theory, measurement theory, and statistical techniques, this book covers a wide range of quantitative-graph theoretical concepts and methods, including those pertaining to real and random graphs such as: Comparative approaches (graph similarity or distance) Graph measures to characterize graphs quantitatively Applications of graph measures in social network analysis and other disciplines Metrical properties of graphs and measures Mathematical properties of quantitative methods or measures in graph theory Network complexity measures and other...

93. A Base de Dados das 55 fontes rádio - Ccm-centro De Ciências Matemáticas; Nuno Gonçalo; Martins Silva Aparício; Pedro Augusto
Dezembro de 2001 Base de Dados Projecto 15134 CCM 1 Índice:

94. Numerical evaluation of renewal equations:: applications to risk theory and financial models - Usábel, Miguel
The so-called Renewal Theory is a frequently used methodology in applied mathematics. Renewal Theory is mainly focussed on solving a Volterra integral equation of the second kind known as Renewal Integral EquationAn interesting problem arises when choosing the appropriate numerical tool in order to approximate the solution of the former integral. The decision will be based on the degree of knowledge of function F(x) and some properties of (u). Three methods based in classical methodologies (simulation, product integration and inverting Laplace transform) will be presented and applied to the calculation of ultimate ruin probabilities in the classical case of Risk...

95. Applications of Gaver-Stehfest method of inverting laplace transforms to ruin theory - Usábel, Miguel
The Stehfest-Gaver method of inverting Laplace transforms is a very useful tool in approximating non-ruin probabilities. An accuracy of 6 to 10 significant digits is obtained in every case studied (Tables 1,2 and 3) except for Log-normal claim size and large initial reserves where the accuracy of the "exact" values (using Product integration ) is not guaranteed to be more than 5 digits. The efficiency in terms of computational time is also outstanding because we onIy need to evaluate 20 times the Laplace transform of the c.dJ. of the claim size as shown in (1.6).

96. Uso de videoclips para aprender a enseñar matemáticas a los futuros maestros - Fernández Verdú, Ceneida; Callejo de la Vega, María Luz; Valls González, Julia; Llinares Ciscar, Salvador
Una de las competencias que deben desarrollar los futuros maestros es interpretar las producciones de los escolares. Estas producciones pueden tener un registro escrito, oral o audiovisual. De todos ellos el audiovisual es el más rico. Permite observar el contexto en que se propone la tarea y la comunicación verbal y no verbal de los participantes. Para conseguir este objetivo el Departamento de Innovación y Formación Didáctica, ha diseñado, grabado y editado videoclips en la aplicación “Vértice” de la Universidad de Alicante, como soporte de prácticas para realizar en las asignaturas de Didáctica de la Matemática de los grados de...

97. Herramientas de aprendizaje de mecánica de suelos - Tomás Jover, Roberto; Cano González, Miguel; García Barba, Javier; Santamarta Cerezal, Juan Carlos; Hernández Gutiérrez, Luis E.; Durá Mora, Jonás; Cerdá Martínez, Alejandra
La Mecánica de Suelos constituye una disciplina fundamental en las enseñanzas técnicas de Ingeniería Civil. Las asignaturas en las que se imparte Mecánica de Suelos tienen una importante carga conceptual que, en ocasiones, requiere largos procesos de aprendizaje para ser asimilada por el alumnado. La combinación de las clases teóricas con la visualización y realización de sencillos experimentos didácticos de laboratorio facilitan el aprendizaje de dicha materia y la comprensión de los fenómenos complejos de una forma sencilla y amena. En el presente trabajo se describen diversos experimentos que se están desarrollando en el área de Ingeniería del Terreno de...

98. Manual o digital. Arquitectura, experiencia del cuerpo y código digital - Trachana, Angelique
Esta aportación trata la incompatibilidad del dibujo por ordenador con la configuración del espacio vivencial trazado con la mano como extensión del cuerpo. Aportamos una experiencia docente del dibujar para proyectar en arquitectura. El código digital, como sabemos, es un lenguaje abstracto, originado en la matemática cuyos signos y operaciones no describen cualidades del sujeto. La utilización del software para proyectar implica que el arquitecto depende de un suministrador que le proporciona un medio de cuya estructura es ajeno. El medio para proyectar es un metalenguaje a cuya estructura no tiene acceso. Según Deleuze, el espacio digital sería la máxima...

99. On a mathematical model arising in MHD perturbed equilibrium for Stellarator devices. A numerical approach. - Padial Molina, Juan Francisco; Galan Del Sastre, Pedro; Díaz Díaz, Jesús Ildefonso
Abstract?We consider a mathematical model related to the stationary regime of a plasma of fusion nuclear, magnetically confined in a Stellarator device. Using the geometric properties of the fusion device, a suitable system of coordinates and averaging methods, the mathematical problem may be reduced to a two dimensional free boundary problem of nonlocal type, where the corresponding differential equation is of the Grad?Shafranov type. The current balance within each flux magnetic gives us the possibility to define the third covariant magnetic field component with respect to the averaged poloidal flux function. We present here some numerical experiences and we give...

100. Preparing topological projected entangled pair states on a quantum computer - Schwarz, Martin; Temme, Kristan; Verstraete, Frank; Pérez García, David; Cubitt, Toby Stanley
Simulating exotic phases of matter that are not amenable to classical techniques is one of the most important potential applications of quantum information processing. We present an efficient algorithm for preparing a large class of topological quantum states, the G-injective projected entangled pair states (PEPS), on a quantum computer. Important examples include the resonant valence bond states, conjectured to be topological spin liquids. The runtime of the algorithm scales polynomially with the condition number of the PEPS projectors and inverse polynomially in the spectral gap of the PEPS parent Hamiltonian.

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