1,037 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
Der Weyl-Kondo-Halbmetall-Kandidat Ce3Bi4Pd3 und seine nichtmagnetische Referenzverbindung La3Bi4Pd3
No full textHeavy fermion systems have fascinated researchers worldwide since their discovery in the 1970s. Despite the amount of exciting materials found in these systems like unconventional superconductors (e.g. CeCoIn5 [1] and CeCu2Si2 [2]) or Kondo insulators (e.g. YbB12 [3], Ce3Bi4Pt3 [4] and SmB6 [5]), many current investigations show unanticipated results like spin-triplet superconductivity in UTe2 [6] which indicates that there is much more to be discovered in this field. In parallel, Weyl fermions, predicted by Hermann Weyl for high energy physics already in 1929, were proposed for solid state materials [7, 8] and first detected in TaAs in 2015 [9]. A material that might combine the physics of both fields is Ce3Bi4Pd3, identified as a Weyl-Kondo semimetal candidate [10, 11], where the Kondo effect arising from the single 4f electron of the rare earth element cerium pins the Weyl nodes near the Fermi level. Recently, a spontaneous Hall effect was discovered in Ce3Bi4Pt3 [12] that provides strong evidence for this assignment. Still many questions remain unanswered: What is the impact of high magnetic fields on the band structure? As the Weyl nodes only appear in certain points in the band structure, is there any anisotropy seen in the transport properties? This thesis seeks to address these questions by further investigating transport properties of Ce3Bi4Pd3 at low temperatures. The annihilation of the Weyl nodes with increasing magnetic field [13] is confirmed on a new lead-flux grown batch of Ce3Bi4Pd3 and a phase transition to a heavy fermion metal at high magnetic fields is found. An anisotropy of the spontaneous Hall effect is observed by changing the angle of the excitation current on a single sample. We confirm different Berry curvature driven Hall signals [12], which were recently also found in WTe2 [14] and are a characteristic of a Weyl semimetal [15], for an excitation current flow along different crystal directions. For a full characterisation of Ce3Bi4Pd3, we study the nonmagnetic reference material by substituting cerium with the non-magnetic element lanthanum to form the metallic compound La3Bi4Pd3. In this material we find a transition to the superconducting phase at T=1.9K by transport measurements. The findings of this study provide important insight into a better understanding of the phenomena happening in the Weyl-Kondo semimetal candidate Ce3Bi4Pd3
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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