Search results for "Conti"

Stochastic equation of population dynamics with diffusion on a domain

2003

We consider Lotka-Volterra competition model with diffusion in a territorial domain with a stochastic perturbation which represents the random variations of environment conditions. We prove the existence, the uniqueness and the positivity of the solution. Moreover, the stochastic boundedness of the solution is analized.

The Master Equation

2009

Ambit processes and stochastic partial differential equations

2011

Ambit processes are general stochastic processes based on stochastic integrals with respect to Levy bases. Due to their flexible structure, they have great potential for providing realistic models for various applications such as in turbulence and finance. This papers studies the connection between ambit processes and solutions to stochastic partial differential equations. We investigate this relationship from two angles: from the Walsh theory of martingale measures and from the viewpoint of the Levy noise analysis.

A symmetric nonlocal damage theory

2003

The paper presents a thermodynamically consistent formulation for nonlocal damage models. Nonlocal models have been recognized as a theoretically clean and computationally efficient approach to overcome the shortcomings arising in continuum media with softening. The main features of the presented formulation are: (i) relations derived by the free energy potential fully complying with nonlocal thermodynamic principles; (ii) nonlocal integral operator which is self-adjoint at every point of the solid, including zones near to the solid's boundary; (iii) capacity of regularizing the softening ill-posed continuum problem, restoring a meaningful nonlocal boundary value problem. In the present app…

Can hydrophobic interactions be correctly reproduced by the continuum models?

1996

The ability of the continuum models to describe hydrophobic interactions is investigated. In this work we have studied the interactions between two methane molecules in aqueous solution by means of a continuum model. The resulting potential of mean force is in good agreement with those obtained using Monte Carlo and molecular dynamics techniques. The three energy contributions appearing in the continuum energy partition (electrostatic, dispersion−repulsion, and cavitation) have been analyzed. The cavitation free energy plays the most important role of the three, determining the existence of an energy barrier between the contact minimum and the separated methane monomers. This barrier, which…

The Reduction of Dimension in the Study of Economic Growth Models

2002

We examine the dimension reduction method and prove that it could be misleading if we try to get some insight into the dynamics of the original system from the dynamics of the transformed system alone. The reduced system seemingly may give rise to a continuum multiplicity of steady states when, actually, it does exist a unique and isolated steady state or even it does not exist a steady state at all. We show how the dynamics for the primary variables that is recovered from the solution to the reduced system may be refuted by solving the original one. In our opinion there is no alternative because nothing can be regarded as a close substitute for the study of the original system. Although th…

THE EXPRESSION OF EVIDENTIALITY IN SPOKEN AND WRITTEN TEXTS: EMPIRICAL APPROACHES TO ROMANCE LANGUAGES

2020

Evidentiality is a grammatical category that encodes information source as its primary meaning. The information can be: acquired through direct perception, reported by others (hearsay) or inferred by the speaker upon considering the information that is available. Languages with an evidential grammatical category have morphemes with a primary evidential value (Aikhenvald 2004). Nevertheless, Romance languages, like many other languages, have a tense- modal system and lack an evidential grammatical category, instead of which several lexical units or certain constructions convey information source. This special issue is devoted to some of those items, such as modal adverbs, evidential meanings…

The functional-psychological continuum in the cognitive image of a destination: A confirmatory analysis

2009

Abstract This paper analyses the cognitive component of the image of a destination from a dual perspective. Firstly, we study its composition by positing three positions on a continuum: functional, mixed and psychological, which are analysed using confirmatory factor analysis. Secondly, we study the influence of these components on tourists' overall image of the destination and on their future behaviour intentions, using structural equation analysis. The results show that the psychological and functional components exercise the greatest influence on the overall image of the destination. Overall image was found to influence future behaviour intentions consistently, while the functional compo…

Thermodynamically consistent residual-based gradient plasticity theory and comparison

2006

A gradient plasticity theory for small deformations is presented within the framework of nonlocal continuum thermodynamics. The second principle (Clausius–Duhem inequality), enriched by an additional term named energy residual, is employed in conjunction with the concepts of insulation condition and locality recovery condition, in order to derive all the pertinent restrictions upon the constitutive equations. These include the expressions of the energy residual and of the plastic dissipation density, as well as the PDEs governing the gradient kinematic and isotropic hardening of the material, together with the related higher-order boundary conditions for both the fixed and the moving bounda…

Cuando Penélope se ha ido de Ítaca: Exilio de Mujeres y Violencias

2015

La presente tesis pretende analizar los procesos de exilios de mujeres que huyen en búsqueda de una vida sin violencia, e investigar qué les sucede, cuando rompen con las normas de género y, en su huida, se lanzan hacia lo que se convertirá en su exilio exterior. Para comprender este proceso, partimos de las siguientes consideraciones: Por una parte, el exilio interior femenino es específico a cualquier mujer (mujer como genérico) en la cultura patriarcal. Por otra, en circunstancias históricas determinadas, al exilio interior se le añade el exilio exterior, que no por ser este último más visible hace desaparecer al anterior. Desde un planteamiento analítico, esta investigación busca aporta…