Search results for "Presentation"
showing 10 items of 2405 documents
Automorphisms of right-angled Artin groups
2012
The purpose of this thesis is to study the automorphisms of right-angled Artin groups. Given a finite simplicial graph $\Gamma$, the right-angled Artin group $G_\Gamma$ associated to $\Gamma$ is the group defined by the presentation whose generators are the vertices of $\Gamma$, and whose relators are commutators of pairs of adjacent vertices. The first chapter is intended as a general introduction to the theory of right-angled Artin groups and their automorphisms. In a second chapter, we prove that every subnormal subgroup of $p$-power index in a right-angled Artin group is conjugacy $p$-separable. As an application, we prove that every right-angled Artin group is conjugacy separable in th…
Knowledge Representation on the Web Revisited : The Case for Prototypes
2016
Recently, RDF and OWL have become the most common knowledge representation languages in use on the Web, propelled by the recommendation of the W3C. In this paper we examine an alternative way to represent knowledge based on Prototypes. This Prototype-based representation has different properties, which we argue to be more suitable for data sharing and reuse on the Web. Prototypes avoid the distinction between classes and instances and provide a means for object-based data sharing and reuse. In this paper we discuss the requirements and design principles for Knowledge Representation based on Prototypes on the Web, after which we propose a formal syntax and semantics. We further show how to e…
Construction of migration project and reasons for emigrating in sub-Saharan African francophone population. An intercontinental study Europe-Africa
2012
Este estudio da cuenta de las razones de los ciudadanos de África subsahariana francófona para establecerse en Europa, y particularmente en Francia, mediante la creación de un marco comprensivo innovador que vincula tres ejes temáticos: la motivación, las migraciones, y África y sus relaciones con Europa. 155 participantes en ambos continentes respondieron a un cuestionario sobre su proyecto migratorio real o posible. Los resultados plantean un plano general de acercamiento a los imaginarios y la realidad de los migrantes en el contexto francés, marcado por la reflexión sobre la identidad nacional, los controles migratorios, un clima político reticente a la migración y un tejido social cara…
Prezentācijas prasmes jauniešu vecumposmā
2019
Jauniešu vecumposms ir tas laiks, kad cilvēks esošās zināšanas ir spējīgs uzlabot ar publiskajām runām un citās situācijās. Šis darbs pēta jauniešu prezentēšanas prasmes izaugsmi, kā arī apskata šo prasmju īpašības, ķermeņa valodas iedarbību publisko runu laikā, kā arī apskata, kas būtu jādara, lai publiskā runa būtu atmiņā paliekoša. Darba mērķis ir izpētīt kādas ir tipiskākās iezīmes prezentēšanas prasmēs jauniešu vecumposā, tādējādi rodot iespējas uzlabot viņu zināšanas un prasmes. Darbā izmantotas pētījuma metodes kā literatūras pārskats un apsekojumi. Apsekojumos studenti un skolotāji aizpildīja anketas. Rezultāti parādīja, ka studentiem pietrūkst zināšanu nozīmīgākās informācijas iekļ…
Enhancing Metastability by Dissipation and Driving in an Asymmetric Bistable Quantum System.
2018
The stabilizing effect of quantum fluctuations on the escape process and the relaxation dynamics from a quantum metastable state are investigated. Specifically, the quantum dynamics of a multilevel bistable system coupled to a bosonic Ohmic thermal bath in strong dissipation regime is analyzed. The study is performed by a non-perturbative method based on the real-time path integral approach of the Feynman-Vernon influence functional. We consider a strongly asymmetric double well potential with and without a monochromatic external driving, and with an out-of-equilibrium initial condition. In the absence of driving we observe a nonmonotonic behavior of the escape time from the metastable regi…
Highly occupied gauge theories in 2 + 1 dimensions : a self-similar attractor
2019
Motivated by the boost-invariant Glasma state in the initial stages in heavy-ion collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensional space-time both with and without a scalar field in the adjoint representation. We show that irrespective of the details of the initial condition, the far-from-equilibrium evolution of these highly occupied systems approaches a unique universal attractor at high momenta that is the same for the gauge and scalar sectors. We extract the scaling exponents and the form of the distribution function close to this non-thermal fixed point. We find that the dynamics are governed by an energy cascade to higher momenta with sc…
Jeu de Taquin and Diamond Cone for so(2n+1, C)
2020
International audience; The diamond cone is a combinatorial description for a basis of a natural indecomposable n-module, where n is the nilpotent factor of a complex semisimple Lie algebra g. After N. J. Wildberger who introduced this notion, this description was achieved for g = sl(n) , the rank 2 semisimple Lie algebras and g = sp (2n).In this work, we generalize these constructions to the Lie algebra g = so(2n + 1). The orthogonal semistandard Young tableaux were defined by M. Kashiwara and T. Nakashima, they index a basis for the shape algebra of so(2n + 1). Defining the notion of orthogonal quasistandard Young tableaux, we prove that these tableaux describe a basis for a quotient of t…
Mi descrivi il tuo disegno del Mattoncino Lego? Un’esperienza didattica di matematica nella scuola dell’infanzia
2018
La consapevolezza dell’importanza di guardare, attraverso una lente di tipo matematico, i disegni prodotti dai bambini, considerandoli come strumento diagnostico per quello che D’Amore et al. (2004) chiamano come il “Campo di Esperienza” Spazio, Ordine e Misura, ha dato spunto a questo contributo che discute una sperimentazione didattica condotta in una sezione di scuola dell’infanzia (5 anni). All’interno della stessa è stato chiesto ai bambini di rappresentare dei mattoncini Lego con un disegno, e di descrivere successivamente i propri elaborati rintracciando e argomentando in essi eventuali segni di scarto numerico-spaziali rispetto al mattoncino osservato/manipolato, attraverso visioni …
Rappresentazioni tattili
2020
Sebbene molto spesso le persone con disabilità debbano accontentarsi di vivere parzialmente alcune esperienze, da diversi anni è aumentata l’attenzione dei siti museali verso la realizzazione di progetti e percorsi dedicati che consentano una fruizione tattile di opere e manufatti ai disabili visivi. Il contributo presenta due casi studio, che utilizzano modelli 3D per installazioni tattili. In presenza di deficit visivo, è importante rafforzare le facoltà percettive connettendo il tatto con i sensi residui e fornendo stimoli cognitivi diversi e paralleli. L’approccio multisensoriale, tattile e uditivo, realizzato grazie alla commistione tra modelli 3D e componenti elettroniche, favorisce l…
Harry Francis Mallgrave. L'empatia degli spazi. Architettura e neuroscienze
2015
Le informazioni che possiamo acquisire sul molteplice aspetto della realtà passano attraverso la percezione sensoriale che il nostro corpo ha dell’esterno. La relazione fra il corpo e l’architettura è proprio il tema centrale intorno al quale si snoda il libro di Harry Francis Mallgrave che, in quanto pioniere degli studi sull'applicazione delle neuroscienze alla teoria architettonica, svela attraverso "L’empatia degli spazi" la potenza e la forza del corpo nel costruire le forme della realtà. Information we can acquire on the multiple aspect of reality passes through sensory perception that our body has of the outside. The relationship between body and architecture is the central topic of …