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Now showing items 1-10 of 40

#### Switching control

(Journal of the European Mathematical Society, 2011-12-31)

We analyze the problem of switching controls for control systems endowed with different actuators. The goal is to control the dynamics of the system by switching from an actuator to another in a systematic way so that, at ...

#### Numerical approximation of a one-dimensional elliptic optimal design problem

(Multiscale Modeling and Simulation, 2011-12-31)

We address the numerical approximation by finite-element methods of an optimal design problem for a two phase material in one space dimension. This problem, in the continuous setting, due to high frequency oscillations, ...

#### Solutions to a model with Neumann boundary conditions for phase transitions driven by configurational forces

(Nonlinear Analysis: Real World Applications, 2011-12-31)

We study an initial boundary value problem of a model describing the evolution in time of diffusive phase interfaces in solid materials, in which martensitic phase transformations driven by configurational forces take ...

#### Emerging properties of financial time series in the "game of Life"

(Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2011-12-31)

We explore the spatial complexity of Conway's "Game of Life," a prototypical cellular automaton by means of a geometrical procedure generating a two-dimensional random walk from a bidimensional lattice with periodical ...

#### Counter-examples of regularity behavior for σ-evolution equations

(Journal of Mathematical Analysis and Applications, 2011-12-31)

In this paper, we mainly discuss the infinite loss of regularity and μ-loss for a σ-evolution type model with oscillating in time coefficients. On the one hand, an explicit counter-example has been constructed in the ...

#### Observability of heat processes by transmutation without geometric restrictions

(Mathematical Control and Related Fields, 2011-12-31)

The goal of this note is to explain how transmutation techniques (originally introduced in [14] in the context of the control of the heat equation, inspired on the classical Kannai transform, and recently revisited in [4] ...

#### Fine structure of spectral properties for random correlation matrices: An application to financial markets

(Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2011-12-31)

We study some properties of eigenvalue spectra of financial correlation matrices. In particular, we investigate the nature of the large eigenvalue bulks which are observed empirically, and which have often been regarded ...

#### Semi-markov graph dynamics

(PLoS ONE, 2011-12-31)

In this paper, we outline a model of graph (or network) dynamics based on two ingredients. The first ingredient is a Markov chain on the space of possible graphs. The second ingredient is a semi-Markov counting process of ...

#### Sharp Observability Estimates for Heat Equations

(Archive for Rational Mechanics and Analysis, 2011-12-31)

The goal of this article is to derive new estimates for the cost of observability of heat equations. We have developed a new method allowing one to show that when the corresponding wave equation is observable, the heat ...

#### Existence of Global Strong Solutions in Critical Spaces for Barotropic Viscous Fluids

(Archive for Rational Mechanics and Analysis, 2011-12-31)

This paper is dedicated to the study of viscous compressible barotropic fluids in dimension N ≧ 2. We address the question of the global existence of strong solutions for initial data close to a constant state having ...