Search results for " Symbolic"

Determinantal sets, singularities and application to optimal control in medical imagery

2016

International audience; Control theory has recently been involved in the field of nuclear magnetic resonance imagery. The goal is to control the magnetic field optimally in order to improve the contrast between two biological matters on the pictures. Geometric optimal control leads us here to analyze mero-morphic vector fields depending upon physical parameters , and having their singularities defined by a deter-minantal variety. The involved matrix has polynomial entries with respect to both the state variables and the parameters. Taking into account the physical constraints of the problem, one needs to classify, with respect to the parameters, the number of real singularities lying in som…

Group-Analytic Family Psychotherapy: A Transcultural Perspective

1997

Group-analytic family psychotherapy is a methodology based on a development of Group-analytic theory. The family is defined as a mental field formed by the symbolic plot of `us' in a double relationship: with the cultural history of the family group on one side, and with external groups on the other. The symbolic plot thus has a tribal characteristic which connects the genealogical trees to the ancestral foundation of the group. In cases of psychotic and borderline patients, Group-analytic family psychotherapy has indicated two types of family: those that are embedded in the past, or families that are cut off from the past. After outlining the circumstances of Italian families, this articl…

Numerical studies to detect chaotic motion in the full planar averaged three-body problem

2023

AbstractIn this paper, the author deals with a well-known problem of Celestial Mechanics, namely the three-body problem. A numerical analysis has been done in order to prove existence of chaotic motions of the full-averaged problem in particular configurations. Full because all the three bodies have non-negligible masses and averaged because the Hamiltonian describing the system has been averaged with respect to a fast angle. A reduction of degrees of freedom and of the phase-space is performed in order to apply the notion of covering relations and symbolic dynamics.

Statistical physics: Some basic principles of fluctuation and noise theory

1983

Abstract Models have traditionally played a significant role in statistical mechanics. In view of the complexity of the system which statistical mechanics attempt to describe, this is not at all surprising. The study of simplified models has frequently revealed the underlying mathematical structure of many physical questions and in so doing the study of models has contributed directly to a clarification of several paradoxes which beset statistical mechanics. In this paper some of the models which appear to be useful for the discussion of non-equilibrium phenomena are examined in some detail. As usual these models are extremely simplified versions of the actual situations. It is, finally, as…

Social representations of latin american immigrants about immigration, care and elderly caregivers

2013

Ageing in Spain has increased considerably and elderly people often find themselves in a situation of great dependence. Facing this situation, many have had the support of immigrant caregivers from Latin America. This research had the purpose to know the social representations (SR) of these caregivers, living in Valencia (Spain), about immigration, care and elderly care. It involved the participation of 35 immigrants who responded the Word Association Test and a socio-demographic questionnaire. The results revealed that the SR on immigration reflect "nostalgia", care was represented by "help", and care for the elderly by "respect". It is concluded that the SR allow understanding the symboli…

Entre el activismo y la mediatización: encuadres de partidos y prensa en la campaña catalana de 2017

2019

Los estudios sobre la cobertura periodística de las campañas electorales apuntan a una creciente mediatización. Este trabajo busca corroborar si la tendencia también se da en circunstancias excepcionales, como las de las elecciones autonómicas de Cataluña en 2017. La investigación compara los encuadres presentados por seis periódicos (El País, El Mundo, La Vanguardia, El Periódico de Catalunya, Punt Avui y Ara) con los adoptados por los siete partidos políticos representados en el parlamento autonómico (JuntsXCat, ERC, PSC, PP, Ciudadanos, En Comú-Podem y CUP). Los resultados indican que los encuadres simbólicos propios de la acción colectiva dominaron en el mensaje de los partidos, aunque …

2017

AbstractOccasionally, organisations are forced to adopt new practices that are inconsistent with the expectations of their stakeholders. An immediate adoption of the practices would risk the organisation’s legitimacy, but as previous research has noted, the perceptions of organisational stakeholders can be managed through symbolic actions. In this article, I examine how actors from four retail organisations symbolically legitimated the adoption of the hypermarket format within their individual contexts by means of internal professional magazines. The analysis suggests that the organisations buttressed their legitimacy by reversing Meyer and Rowan’s idea of loose coupling – adopting the new …

El precio de ser itinerante. Viajes, acompañamiento y espacios cortesanos de la reina Leonor de Sicilia (r. 1349-1375)

2021

This article is an attempt to detail which logistical, economic and human implications had the itinerancy of the medieval monarchy. For this reason, the paper focuses on the characteristics of the itinerancy of Eleanor of Sicily, third wife of Pedro the Ceremonious and queen of the Crown of Aragon between 1349 and 1375. Through the analysis of her documentation, from chancery and treasury resources, it has been possible to establish an itinerary of the queen for three years, from 1354 to 1357. The analysis of this itinerary allows us to see the confluence of the royal couple entourages and the consequences of the beginning of the Dos Pedros war. At the same time, the paper focuses on the pe…

Symbolic dynamics in a binary asteroid system

2020

We highlight the existence of a topological horseshoe arising from a a--priori stable model of the binary asteroid dynamics. The inspection is numerical and uses correctly aligned windows, as described in a recent paper by A. Gierzkiewicz and P. Zgliczy\'nski, combined with a recent analysis of an associated secular problem.

Steiner configurations ideals: Containment and colouring

2021

Given a homogeneous ideal I&sube