982 research outputs found
Analysis of Mathieu Equation Stable Solutions in the First Zone of Stability
No full textAbstractThe paper presents the results of a homogeneous Mathieu equation studies. Mathieu equation solutions are oscillations, modulated in amplitude and frequency. In the computational experiments we found dependences of the given oscillations on the ratio of the coefficients. These dependences are shown in graphs that can be used for an approximate estimation of the Mathieu equation solutions without integration
Pensar las escalas para pensar las luchas: Autor: Mathieu UHEL
No full textA través de un título sugerente, “pensar las escalas para pensar las luchas”, Mathieu Uhel entreteje la construcción teórico-crítica del concepto escala, generada por la geografía radical anglosajona de finales del siglo XX, con la necesidad/utilidad práctica de la escala para concienciar las luchas sociales. El artículo cumple un doble propósito: por un lado, delinear los elementos de lectura sobre el concepto escala; y, con ello, promover la atención de esta problemática en las luchas contemporáneas. En un primer apartado, Uhel ubica las discusiones académicas en torno a la escala, como herramienta metodológica útil para comprender la complejidad de las sociedades capitalistas; en el segundo apartado, el autor avanza la exposición en torno al contexto de la dimensión escalar del imperialismo capitalista; finalmente, el autor se centra en el rol de la actividad política a escala nacional en la tensa relación entre las imposiciones del capital y la lucha social.Por meio de um título sugestivo, “pensando escalas para pensar lutas”, Mathieu Uhel entrelaça a construção teórico-crítica do conceito de escala, gerado pela geografia radical anglo-saxônica do final do século XX, com a necessidade / utilidade prática escala para aumentar a consciência das lutas sociais. O artigo tem um duplo propósito: por um lado, delinear os elementos de leitura sobre o conceito de escala; e, com isso, promover atenção a esse problema nas lutas contemporâneas. Na primeira seção, Uhel localiza as discussões acadêmicas em torno da escala, como uma ferramenta metodológica útil para compreender a complexidade das sociedades capitalistas; na segunda seção, o autor avança a exposição em torno do contexto da dimensão escalar do imperialismo capitalista; por fim, o autor enfoca o papel da atividade política em escala nacional na tensa relação entre as imposições do capital e a luta social.Mathieu Uhel\u27s suggestive title, “Thinking about scales to think about struggles”, he interweaves the theoretical-critical construction of concept scale, generated by radical Anglo-Saxon geography in the late 20th century, with it´s practical utility to social struggles. The article serves two purposes: on the one hand, Uhel locates academic discussion around scale; and, with this, he promotes attention to this problem in contemporary struggles. In the first section, Uhel locates academic discussions around scale, as a useful methodological tool to understand the complexity of capitalist societies; in the second section, the author advances the argument around the context of the scalar dimension of capitalist imperialism; finally, the author focuses on the role of political activity on a national scale in the tense relationship between the impositions of capital and the social movement
Rôle de SHP-1 et de son activation pharmacologique dans la réponse à la fumée de cigarette de tabac
No full textMathieu Ichou, Les Enfants d’immigrés à l’école
No full textIt is common to hear in the fields of educational and immigration sociology that on average, the children of immigrants do not perform as well in school as children of native-born parents. Mathieu Ichou offers an innovative sociological analysis on a topic that is heavily exploited by political and media discourse, and subject to much scientific controversy. The author takes distance from the homogenized vision of a “second generation” of students who have totally failed academically, and rep..
L'impatto dell'attività tintoria sull'ambiente. Firenze alla fine del Medioevo
No full textThe author aims to examine and categorize the range of dyeings materials used in the Florentine wool and silk textile industries in the late Middle Ages, focusing mainly on those produced within the regional space in order to evaluate the impact of the Florentine dyeing activity on the natural environment and the productive landscape of the Tuscan countryside. In particular, the author establishes a line of demarcation between cultivated and uncultivated resources in order to verify which constitutes an indication of the level of industrial development of medieval textile production. This further focuses on how the transition from the exploitation of wild resources to the exploitation of cultivated resources could reflect a greater degree of economic integration between the countryside and the city and contribute to the formation of a regional economic space
Mathieu de Fossey: su visión del mundo indígena mexicano
No full textThroughout these pages the author shows how Mathieu de Fossey perceived that it was not easy to make indigenous communities fit within the mould of the nation-state which, being based on the liberal and egualitarian ideology, was against the recognition of special regimes, such as those that created a peculiar status for the native population of the American territory during the period of Spanish colonial domination
Multiplicité des valeurs propres du laplacien sur les surfaces hyperboliques triangulaires
No full textCe mémoire porte sur l’étude du laplacien sur des surfaces de Riemann. En particulier, nous nous intéressons à ses valeurs propres qui représentent les notes que jouerait la surface si elle était un tambour. Les valeurs les plus étudiées sont la première valeur propre non nulle λ1 ainsi que sa multiplicité m1 (la dimension de l’espace propre). Notamment, Colin de Verdière conjecturait que m1 est toujours borné supérieurement par le nombre chromatique moins 1. Des travaux de Fortier Bourque et Petri ont montré que parmi toutes les surfaces hyperboliques de genre 3, c’est la quartique de Klein qui maximise la multiplicité et atteint la borne supérieure conjecturée par Colin de Verdière. Cette surface est la première d’une suite de surfaces hautement symétriques, les surfaces de Hurwitz. Nous montrons à l’aide de la formule des traces de Selberg que pour la prochaine surface dans la suite, la surface de Fricke–Macbeath F, nous avons m1(F) = 7. Une recherche indépendante menée par Chul-hee Lee arrive au même résultat à propos de la multiplicité.
Le chapitre 1 introduit des notions géométriques comme la géométrie hyperbolique, les surfaces hyperboliques et triangulaires ainsi que le théorème de Hurwitz. Le chapitre 2 présente des concepts de base de théorie spectrale ainsi que des outils comme la formule des traces de Selberg et la théorie de la représentation. Le chapitre 3 est dédié à l’étude de la surface de Fricke–Macbeath et à la preuve de notre résultat principal à l’aide des outils des chapitres précédents. Dans le chapitre 4, nous discutons de nouvelles techniques de calcul de m1 qui ont été utilisées pour montrer l’existence de contre-exemples à la conjecture de Colin de Verdière dans des travaux conjoints avec Fortier Bourque, Gruda-Mediavilla et Petri.This master’s thesis studies the Laplace operator on Riemann surfaces. We are especially interested in its eigenvalues, which correspond to the notes that the surface would play if it were a drum. In particular, the first non-zero eigenvalue λ1 and its multiplicity m1 (the dimension of the corresponding eigenspace) have been well studied. For instance, Colin de Verdière conjectured that m1 is bounded above by the chromatic number minus 1 based on a few examples. Later work by Fortier Bourque and Petri showed that among hyperbolic surfaces of genus 3, the Klein quartic maximizes the multiplicity, and attains the upper bound conjectured by Colin de Verdière. This surface is the first of a sequence of highly symmetrical surfaces named Hurwitz surfaces. We will show using the Selberg trace formula that for the next surface in the sequence, the Fricke–Macbeath surface F, we have m1(F) = 7. This result was also obtained independently by Chul-hee Lee.
Chapter 1 introduces some geometric notions including hyperbolic geometry, hyperbolic surfaces, and triangular surfaces, followed by Hurwitz’s automorphism theorem. Chapter 2 covers some basic concepts in spectral theory as well as some useful tools like the Selberg trace formula and a bit of representation theory. Chapter 3 focuses on the study of the Fricke–Macbeath surface and the proof of our main result using the techniques introduced in previous chapters. Finally, Chapter 4 discusses new methods for computing m1 which were used to show the existence of counterexamples to Colin de Verdière’s conjecture in joint work with Fortier Bourque, Gruda-Mediavilla, and Petri
Mathieu de Fossey: su visión del mundo indígena mexicano
No full textÀ travers ces pages, l’auteur montre comment Mathieu de Fossey avait perçu la difficulté d’insérer le monde des communautés indigènes dans le moule d’un État national qui, accroché à une idéologie libérale égalitaire, refusait d’établir des régimes spéciaux comparables à ceux qui, durant la domination espagnole, avaient reconnu un statut particulier aux populations natives du continent américain.A través de estas páginas se muestra cómo Mathieu de Fossey percibió el difícil acoplamiento del mundo de las comunidades indígenas en el molde de un Estado nacional que, por estar sustentado en la ideología liberal igualitaria, era contrario al reconocimiento de regímenes especiales como los que, durante la dominación española, habían establecido un status peculiar para los aborígenes del territorio americano.Throughout these pages the author shows how Mathieu de Fossey perceived that it was not easy to make indigenous communities fit within the mould of the nation-state which, being based on the liberal and egualitarian ideology, was against the recognition of special regimes, such as those that created a peculiar status for the native population of the American territory during the period of Spanish colonial domination
Investigation of documents persistency on the Web
No full text@inproceedings{CI-Lancieri-2004-2, author = {Lancieri, Luigi and Lecouvey, Mathieu and Glasse, Veronique}, title = {Investigation of documents persistency on the Web}, booktitle = {International conference E-Society 2004 (ES2004), IADIS}, year = {2004}, address = {Spain} }International audienc
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