Search results for "positions"
showing 10 items of 97 documents
Bridges, channels and Arnold's invariants for generic plane curves
2002
Abstract We define sums of plane curves that generalize the idea of connected sum and show how Arnol'd's invariants behave with respect to them. We also consider the inverse process of decomposition of a curve and as an application, obtain a new method that reduces considerably the amounts of computation involved in the calculation of Arnold's invariants.
A quasiconformal composition problem for the Q-spaces
2017
Given a quasiconformal mapping $f:\mathbb R^n\to\mathbb R^n$ with $n\ge2$, we show that (un-)boundedness of the composition operator ${\bf C}_f$ on the spaces $Q_{\alpha}(\mathbb R^n)$ depends on the index $\alpha$ and the degeneracy set of the Jacobian $J_f$. We establish sharp results in terms of the index $\alpha$ and the local/global self-similar Minkowski dimension of the degeneracy set of $J_f$. This gives a solution to [Problem 8.4, 3] and also reveals a completely new phenomenon, which is totally different from the known results for Sobolev, BMO, Triebel-Lizorkin and Besov spaces. Consequently, Tukia-V\"ais\"al\"a's quasiconformal extension $f:\mathbb R^n\to\mathbb R^n$ of an arbitr…
Punto interrogativo
2021
Analisi morfologica e sintattica del punto interrogativo nei disegni di Saul Steinberg Morphological and syntactic analysis of the question mark in Saul Steinberg's drawings
Presentazione
2013
Il testo propone un articolato commento alle posizioni teoriche e alle linee di ricerca progettuale espresse da Michele Argentino, professore ordinario di Design a Palermo circa la necessità di riconquistare il ruolo sociale alla creatività individuale, riprendendosi il desiderio di diventare nuovamente "Homo Faber". Il testo inoltre presenta gli obiettivi della nuova collana scientifica - diretta dall'autrice - dal Titolo " Design e Contesti": intercettare ambiti di ricerca trasversali alle discipline del progetto, favorire gli intrecci tra idee progettuali e percorsi di innovazione socio-culturale, sviluppare nuove strategie produttive compatibili con i diversi aspetti della sostenibilità.
Las grandes Exposiciones en Europa: 1992-2002. Efectos duraderos sobre la ciudad y apropiación por parte de la ciudadanía.
2012
This paper studies the influence of great contemporary Expositions on the transformation of cities and of territories, developing some aspects we consider relevant of these events: their growing relevance in urban contemporary politics and the urban and architectural project as creator of the regeneration of abandoned or obsolete areas. Against the short duration of these events, the positive and negative effects, like the definition of new urban and territorial domains, the modernization of infrastructures and services, the impulse of private stakeholders toward building lands and the consolidation of City-Brand in tourism nets among others, have a much longer duration, and depend on the u…
Spazio e percorso in siciliano antico: analisi di un corpus
2020
In ancient Sicilian, basic spatial relations are encoded by means of prepositional phrases introduced by ‘da’ and ‘di’ (origin), ‘a’, ‘in’ and ‘intra’ (location and direction), ‘per/pir/pri’ (path). This contribution offers a description of these encoding means based on the examination of a corpus of Sicialian texts of the 14th to 16th centuries. The analysis is carried out against a cognitive grammar theoretical background and takes into account the existing studies on spatial relations in the world languages. These studies brought to light some recurring patterns: for instance, ‘direction’ tends to be encoded in a more articlulated way than ‘origin’, while the encoding of ‘path’ seems to …
Site symmetry approach applied to the supercell model of MgAl2O4 spinel with oxygen interstitials: Ab initio calculations
2018
This study has been carried out within the framework of the EUROfusion Consortium and has been provided funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The authors are indebted to E.A. Kotomin, A.I. Popov and R. Vila for stimulating discussions. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Calculations have been performed using both the Marconi supercomputer system at the Computational Simulation Centre (Italy) and the Computer Center of St. Petersburg State University.
ROVIBRATIONAL AND STARK SPECTROSCOPY OF THE X2Y4MOLECULES. APPLICATION TO ETHYLENE
2005
This thesis is devoted to the spectroscopy of ethylene in the aim of studying the molecule trapped in zeolites. The first part deals with the tensorial model adapted to the symmetry of the isolated molecule: formalism, Hamiltonian and transition moments. To take the strong electric fields existing into zeolites into account, an extension of the model to the Stark effect is proposed in the second part. The third part describes the programs of the D2hTDS software which have been built for the calculation and analysis of X2Y4-type molecule spectra. The fourth part presents applications to the calculation and analysis of zero-field and Stark ethylene spectra. In particular, the model has been t…
Das kompositorische Verfahren in Jean Moutons Quadrupelkanon Nesciens mater virgo virum
2012
Anhand der kompositorischen Probleme, die sich bei der Konzeption mehr als zweistimmiger Kanons ergeben, wird der Frage nachgegangen, wie der konkrete Kompositionsprozess um 1500 ausgesehen haben konnte. Eine Analyse von Jean Moutons Motette Nesciens mater zeigt, dass die Wechselwirkungen zwischen Kanonkonzeption, Klangfolge und melodischer Gestaltung eine simultane Kompositionsweise voraussetzen, in der die Klangfolge wechselnde Verhaltnisbestimmungen als Resultat und Voraussetzung der kontrapunktischen Konfiguration erfahrt: Der Wechsel von der Sukzessiv- zur Simultankonzeption erscheint in Bezug auf komplexe Kanonbildungen als ein verfahrenstechnisches Erfordernis.
Crystal Structure of Heusler Compounds
2013
Heusler compounds are promising materials in many fields of contemporary research. The spectrum of their possible applications ranges from magnetic and magneto-mechanical materials over semiconductors and thermoelectrics to superconductors. An important feature of the Heusler compounds is the possibility of controlling the valence electron concentration by partial substitution of elements. On the other hand, the properties also depend on the degree of ordering of the crystal structure. In general, Heusler compounds crystallize in the Cu2MnAl-type structure but in many cases certain types of disorder are observed. In this chapter, a detailed description of the crystal structure as well as di…