Now showing items 82-101 of 220

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

(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 ...
• #### Finite time blow-up and condensation for the bosonic Nordheim equation ﻿

(2014-12-31)
The homogeneous bosonic Nordheim equation is a kinetic equation describing the dynamics of the distribution of particles in the space of moments for a homogeneous, weakly interacting, quantum gas of bosons. We show the ...
• #### Finite time blow-up for the bosonic Nordheim equation ﻿

(2015-12-31)
The homogeneous bosonic Nordheim equation is a kinetic equation describing the dynamics of the distribution of particles in the space of moments for a homogeneous, weakly interacting, quantum gas of bosons. We show the ...
• #### Fitting second-order acyclic marked markovian arrival processes ﻿

(2013-12-31)
Markovian Arrival Processes (MAPs) are a tractable class of point-processes useful to model correlated time series, such as those commonly found in network traces and system logs used in performance analysis and reliability ...
• #### Flux identification for 1-d scalar conservation laws in the presence of shocks ﻿

(2011-12-31)
We consider the problem of flux identification for 1-d scalar conservation laws formulating it as an optimal control problem. We introduce a new optimization strategy to compute numerical approximations of minimizing fluxes. ...
• #### Fracture Surfaces and the Regularity of Inverses for BV Deformations ﻿

(2011-12-31)
Motivated by nonlinear elasticity theory, we study deformations that are approximately differentiable, orientation-preserving and one-to-one almost everywhere, and in addition have finite surface energy. This surface energy ...
• #### Full characterization of the fractional Poisson process ﻿

(2011-12-31)
The fractional Poisson process (FPP) is a counting process with independent and identically distributed inter-event times following the Mittag-Leffler distribution. This process is very useful in several fields of applied ...
• #### Generation of two-dimensional water waves by moving bottom disturbances ﻿

(2014-12-31)
In this study we investigate the potential and limitations of the wave genera- tion by disturbances moving at the bottom. More precisely, we assume that the wavemaker is composed of an underwater object of a given shape ...
• #### Global Attractor for a Generalized Discrete Nonlinear Schrödinger Equation ﻿

(2014-12-31)
A generalized discrete nonlinear Schr√∂dinger equation (Formula presented.) with long-range interactions in weighted spaces (Formula presented.) is considered. Under suitable assumptions on the coupling constants J(m), the ...
• #### Global exact controllability in infinite time of Schrodinger equation: multidimensional case ﻿

(2014-12-31)
In this paper, we study the problem of controllability of Schrödinger equation. We prove that the system is exactly controllable in infinite time to any po- sition. The proof is based on an inverse mapping theorem for ...
• #### Gradient-based optimization techniques for the design of static controllers for Markov jump linear systems with unobservable modes ﻿

(2014-12-31)
The paper formulates the static control problem of Markov jump linear systems, assuming that the controller does not have access to the jump variable. We derive the expression of the gradient for the cost motivated by the ...
• #### Hard-type inequalities for $\Delta_{\lambda}$-Laplacians ﻿

(2015-12-31)
We derive Hardy-type inequalities for a large class of sub-elliptic operators that belong to the class of (Formula presented.) -Laplacians and find explicit values for the constants involved. Our results generalize previous ...
• #### Hardy inequalities, observability, and control for the wave and schrödinger equations with singular potentials ﻿

(2009-12-31)
We address the question of exact controllability of the wave and Schrodinger equa\-tions perturbed by a singular inverse-square potential. Exact boundary controllability is proved in the range of subcritical coefficients ...
• #### Hardy inequality and Pohozaev identity for operators with boundary singularities: Some applications ﻿

(2011-12-31)
We consider the Schrödinger operator Aλ:=-δ-λ/|x|2, λ∈R, when the singularity is located on the boundary of a smooth domain Ω⊂RN, N≥1.The aim of this Note is two folded. Firstly, we justify the extension of the classical ...
• #### Hardy type inequalities for $\Delta_{\lambda}$-Laplacians ﻿

(2016-01-01)
We derive Hardy-type inequalities for a large class of sub-elliptic operators that belong to the class of $\Delta_{\lambda}$-Laplacians and find explicit values for the constants involved. Our results generalize previous ...
• #### High frequency wave packets for the Schrödinger equation and its numerical approximations [Paquets d'ondes à haute fréquence pour l'équation de Schrödinger et ses approximations numériques] ﻿

(2011-12-31)
We build Gaussian wave packets for the linear Schrödinger equation and its finite difference space semi-discretization and illustrate the lack of uniform dispersive properties of the numerical solutions as established in ...
• #### Homogenization of fiber reinforced brittle materials: The extremal cases ﻿

(2009-12-31)
We analyze the behavior of a fragile material reinforced by a reticulated elastic unbreakable structure in the case of antiplane shear. The microscopic geometry of this material is described by means of two small parameters: ...
• #### Homogenization of the Neumann problem in perforated domains: An alternative approach ﻿

(2011-12-31)
The main result of this paper is a compactness theorem for families of functions in the space SBV (Special functions of Bounded Variation) defined on periodically perforated domains. Given an open and bounded set Ω n, and ...
• #### Identification of the class of initial data for the insensitizing control of the heat equation ﻿

(2009-12-31)
This paper is devoted to analyze the class of initial data that can be insensitized for the heat equation. This issue has been extensively addressed in the literature both in the case of complete and approximate insensitization ...
• #### Incompressible limit of the non-isentropic Navier-Stokes equations with well-prepared initial data in three-dimensional bounded domains ﻿

(2011-12-31)
This paper studies the incompressible limit of the non-isentropic Navier-Stokes equations for viscous polytropic flows with zero thermal coefficient in three-dimensional bounded C4-domains. The uniform estimates in the ...