987 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
Cerebellar dysplasias : structural functional correlations
No full textLa dysplasie cérébelleuse est une anomalie du développement tissulaire intéressant principalement le cervelet et résultant en une anomalie focale ou diffuse de son architecture macroscopique et microscopique. Plusieurs travaux antérieurs ont bien documenté sa caractérisation morphologique à l'imagerie par résonance magnétique (IRM). Cependant, le retentissement de cette malformation, parfois associée à d'autres anomalies développementales du système nerveux central (SNC), sur le développement et le fonctionnement cognitifs est mal connu et peu documenté. Dans le but d'étudier les corrélations anatomo-fonctionnelles de cette pathologie constitutionnelle du cervelet, par le biais de l'approche des altérations neuropsychologiques, génétiques et, fonctionnelles associées, ainsi que par l'approche neuroanatomique, nous avons dirigé nos travaux dans quatre axes principaux et sur trois types de population distinctes. Le premier axe a concerné l'évaluation du profil neuropsychologique et du suivi chez dix enfants porteurs d'une dysplasie cérébelleuse isolée (DCI). Nous avons pu observer chez ces enfants une grande diversité de l'expression neuropsychologique de la DCI, depuis l'efficience normale jusqu'au retard mental sévère, sans corrélation avec le degré de dysplasie. D'autre part, au cours du suivi de ces enfants, nous avons observé une hétérogénéité d'évolution à caractère imprédictible, avec l'émergence des certaines fonctions dans l'axe du langage notamment. Le deuxième axe a porté sur l'investigation fonctionnelle du SNC par l'étude de la consommation cérébrale du fluorodeoxyglucose par Tomographie à émission de positons (TEP-FDG) chez six enfants porteurs d'une DCI. Les résultats ont montré, au sein du cervelet, un aspect normal dans les dysplasies mineures (limitées au vermis), un hypométabolisme des zones dysplasiques (corrélé à l'extension anatomique), et un isométabolisme au cortex dans les hétérotopies. Toutefois, ces anomalies de captation du glucose n'étaient pas corrélées au dysfonctionnement cognitif. Le troisième axe était d'approcher les corrélations génétiques, dans l'hypothèse d'un lien physiopathologique embryologique entre le cerveau et le cervelet, dans les dysplasies cérébelleuses associées (DCA) aux Lissencéphalies (cerveaux lisses). La caractérisation génétique relativement bien définie des Lissencéphalies nous a permis d'identifier des gènes de la migration neuronale et axonale (RELN et VLDRL) comme étant significativement associés aux dysplasies cérébelleuses, en dehors des dystrophies musculaires congénitales impliquant les gènes de la O-glycosylation. Le quatrième axe a été de rechercher chez des volontaires sains les marqueurs neuroanatomiques potentiels des altérations cognitives dans les dysplasies cérébelleuses, partant de l'hypothèse selon laquelle, une malformation isolée du cervelet induirait des anomalies anatomiques détectables en imagerie par tenseur de diffusion (DTI), sur les voies de projections cérébello-corticales, vraisemblablement impliquées dans la contribution du cervelet au développement et à l'exécution des fonctions supérieures. Ce travail nous a permis d'individualiser et de quantifier les projections cérébello-corticales préfrontales et pariétales chez tous les sujets sains.Cerebellar dysplasia is a developmental anomaly involving mainly the cerebellum, resulting in a focal or diffuse macroscopic and microscopic disruption of the tissue architecture. Previous studies have well documented the magnetic resonance imaging (MRI) features of this malformation. However, the impact of cerebellar dysplasia, which may be associated with other developmental anomalies of the central nervous system (CNS), on the cognitive development and function, is ill known and poorly documented. We aimed to study the structural functional correlations in this cerebellar malformation, by investigating the neuropsychological, genetic and, functional disturbances associated as well as the neuroanatomical approach. Our work was conducted in 4 directions including 3 different populations. First, we assessed the neuropsychological profile and the follow-up of children with isolated cerebellar dysplasia (ICD). We observed I this population a wide range of neuropsychological expression of ICD, from normal efficiency to severe mental retardation, without no correlation with the degree of dysplasia. Moreover, during the follow-up of these children, we noticed the unpredictable heterogeneity of the cognitive evolution with the emergence in some cases of certain function such as language. Secondly, we investigated the CNS function using fluorodeoxyglucose positron emission tomography (FDG-PET) in six children with ICD. The results showed within the cerebellum a normal aspect in patients with minor dysplasia (restricted to the vermis), a hypometabolism in dysplastic zones (correlating with the anatomical extent), and a metabolism similar to that of the cortex in heterotopias. Nevertheless, these functional disturbances were not correlated with neuropsychological impairement. Thirdly, we attempted to investigate the genetic abnormalities leading to the embryology physiopathology basis of cerebellar dysplasias associated (CDA) with Lissencephalies (smooth brain). The quite well characterized genetics of human brain lissencephalies have allowed us to identify some genes involved in the neuronal and axonal migration process (RELN and VLDLR) to be significantly associated with cerebellar dysplasia, not including CDA in muscular dystrophy syndromes related to O-glycosylation defects. Fourthly, we aimed to find in normal volunteers the neuroanatomical potential markers of cognitive disturbances associated with cerebellar dysplasia, on the hypothesis that an isolated cerebellar malformation could induce some anomalies on the pathways of cerebello-cortical projections, detectable by diffusion tensor imaging (DTI). These pathways are presumably involved in the cerebellar implication in higher functions. This work has allowed us to visualize and quantify selectively the cerebello-cortical projections to the prefrontal and parietal cortices in the normal human brain. Thus, our overall results have permitted: (i) to clearly assess the neuropsychological disturbances associated with ICD and their heterogeneity, both at the time of diagnosis and at the follow-up, (ii) to correlate the cerebellar dysplasia to brain glucose uptake differences and subsequently to brain dysfunction, (iii) to suggest some precise genetic analyses in neuronal and axonal migration pathways, and eventually, (iv) to obtain some anatomical markers which we can apply to dysplastic patients in order to assess the putative disruption of cerebello-cortical projections. Thereby, our results have opened numerous perspectives in applying advanced anatomical and functional neuroimaging techniques to the cerebellar dysplastic patients
Mathieu 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
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
Development and test of a universal FPGA-based Arc Detector for accelerating cavities at the facility for Antiproton and Ion Research FAIR [10.08.2011]
No full textOnTEAM metadata: GDSID: DOC-2011-Nov-83; Attribute ID: LIBRARY-thesis_ma-2011-001; Title: [GSI Ma 2011-01] Development and test of a universal FPGA-based Arc Detector for accelerating cavities at the facility for Antiproton and Ion Research FAIR [10.08.2011]; Author(s): Omet, Mathieu; Corporate author(s): ; Publication date: 20111116; Creator: manton; Creation date: 16.11.2011 16:02:19; Change date: 16.11.2011 16:44:09; Access: Welt; Attribute type: Text.Thesis.MA; Directory path: ['GSI Publications', 'GSI as Publisher']; Attribute path: ['Infrastructure', 'Library and Documentation', 'thesis_ma', 'Added in 2011']; File name(s): ['DOC-2011-Nov-83-1.pdf']; File title(s): ['']; File access: ['GSI-intern'
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