Search results for " Representation."
showing 10 items of 791 documents
Mixed Convolutions and Zak Transforms
2015
In this chapter we introduce the mixed continuous–discrete and discrete–discrete convolutions. Important special cases of such convolutions are the polynomial and discrete splines, respectively. The Zak transforms, which are introduced in the chapter, provide integral representation of signals, which, in the following chapters, serves as a tool for the design of splines and spline-wavelets and operations over them. The exponential splines, which are the Zak transforms of polynomial and discrete B-splines are introduced. Explicit formulas for the characteristic functions of splines’ spaces are derived.
Rappresentare la Post-metropoli. La Sicilia Sud-Orientale oltre gli stereotipi massmediatici.
A methodological approach to analyze the territorial appropriation of high-speed rail from interactions between actions and representations of local …
2019
International audience; Because it is difficult to separate the specific transport impact from other factors influencing economic and spatial development, the focus in research is increasingly on understanding the process by which territorial changes occur in order to explain how economic and social agents and local authorities have appropriated new transportation systems. This appropriation plays a crucial part in territorial dynamics. The diversity of economic and spatial changes produced by high-speed rail indicates the existence of multiple modes of appropriation which vary according to the location of stations, the mobilization of local stakeholders confronted with the transport operat…
Les effets de la réforme sur le sentiment de professionnalisation des futurs enseignants
2013
S’inscrivant dans un cadre européen, la formation des enseignants en France fait l’objet, depuis 2005, de réformes profondes dont l’enjeu porte sur un renforcement des compétences professionnelles et un adossement des savoirs enseignés à la recherche. Partant de données longitudinales recueillies auprès de 3 générations d’étudiants inscrits dans le nouveau master « enseigner, éduquer, apprendre » ouvert à l’université de Bourgogne en 2010, cette recherche met en lumière la façon dont les étudiants se destinant au professorat des écoles perçoivent la qualité de leur professionnalisation. Malgré le sentiment de ne pas être suffisamment préparés pour l’exercice de leur métier, le discours des …
Older Adult Mentors and Youth at Risk: Challenges for Intergenerational Mentoring Programs in Family-Centered Cultures
2012
This article poses some preliminary reflections about the viability of youth mentoring schemes in family-centered cultural contexts based on a pilot experience developed in Spain within the framework of a project aiming to train older adults as youth mentors in five European countries. After an introduction to the field of intergenerational mentoring, a description of the pilot program follows, with special attention paid to the development of the Spanish local project. Drawing on the project evaluation, some open questions are posed regarding (a) the optimal institutional framing for an intergenerational mentoring program and (b) the challenge with social representation of the mentor role.
Les foyers de protection judiciaire de la jeunesse et la prise en charge des jeunes auteurs de délit : représentations sociales et réflexions autour …
2018
The educators’ work in juvenile justice residential communities and their capacity of affective attunement to the adolescent's needs is essential for the creation of a protective and enriching context for the adolescent and his life trajectories. This article aims to explore the social representations of educators and young people in residential communities in Italy, through the analysis of their discourses gathered during focus groups. Our results reveal the need to compare these representations and work to narrow the gap between the caregivers and the users, in order to improve the relationship between the different protagonists of the interaction and, consequently, the possibilities of g…
Singular quadratic Lie superalgebras
2012
In this paper, we give a generalization of results in \cite{PU07} and \cite{DPU10} by applying the tools of graded Lie algebras to quadratic Lie superalgebras. In this way, we obtain a numerical invariant of quadratic Lie superalgebras and a classification of singular quadratic Lie superalgebras, i.e. those with a nonzero invariant. Finally, we study a class of quadratic Lie superalgebras obtained by the method of generalized double extensions.
Irreducible characters taking root of unity values on $p$-singular elements
2010
In this paper we study finite p-solvable groups having irreducible complex characters chi in Irr(G) which take roots of unity values on the p-singular elements of G.
Representation Theorems for Solvable Sesquilinear Forms
2017
New results are added to the paper [4] about q-closed and solvable sesquilinear forms. The structure of the Banach space $\mathcal{D}[||\cdot||_\Omega]$ defined on the domain $\mathcal{D}$ of a q-closed sesquilinear form $\Omega$ is unique up to isomorphism, and the adjoint of a sesquilinear form has the same property of q-closure or of solvability. The operator associated to a solvable sesquilinear form is the greatest which represents the form and it is self-adjoint if, and only if, the form is symmetric. We give more criteria of solvability for q-closed sesquilinear forms. Some of these criteria are related to the numerical range, and we analyse in particular the forms which are solvable…
Lie properties of symmetric elements in group rings
2009
Abstract Let ∗ be an involution of a group G extended linearly to the group algebra KG . We prove that if G contains no 2-elements and K is a field of characteristic p ≠ 2 , then the ∗-symmetric elements of KG are Lie nilpotent (Lie n -Engel) if and only if KG is Lie nilpotent (Lie n -Engel).