15 research outputs found

    Lip : les horlogers remettent les pendules à l'heure

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    Tenter une histoire de Lip aujourd'hui n'est pas sans déchaßner les passions. Celle-ci se trouvera confrontée aux réactions de ceux qui ont été les acteurs d'une telle lutte. Ce simple fait montre la prégnance du mouvement dans la mémoire collective. Plusieurs témoins parlent d'ailleurs de la trop forte exploitation de cette histoire par des chercheurs ou écrivains en tous genres, qui s'approprient à leur profit un tel événement, et éditent des ouvrages parfois éloignés de la réalité en utili..

    Competing types of quantum oscillations in the 2D organic conductor (BEDT-TTF)8Hg4Cl12(C6H5Cl)2

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    Interlayer magnetoconductance of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Cl)2 has been investigated in pulsed magnetic fields extending up to 36 T and in the temperature range from 1.6 to 15 K. A complex oscillatory spectrum, built on linear combinations of three basic frequencies only is observed. These basic frequencies arise from the compensated closed hole and electron orbits and from the two orbits located in between. The field and temperature dependencies of the amplitude of the various oscillation series are studied within the framework of the coupled orbits model of Falicov and Stachowiak. This analysis reveals that these series result from the contribution of either conventional Shubnikov-de Haas effect (SdH) or quantum interference (QI), both of them being induced by magnetic breakthrough. Nevertheless, discrepancies between experimental and calculated parameters indicate that these phenomena alone cannot account for all of the data. Due to its low effective mass, one of the QI oscillation series - which corresponds to the whole first Brillouin zone area - is clearly observed up to 13 K.Comment: 8 pages, 8 figures. To be published in Phys. Rev.

    ÂżCuĂĄles son los elementos necesarios para que un club de fĂștbol tenga Ă©xito en el mercado bursĂĄtil?

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    Tesis (MagĂ­ster en AdministraciĂłn de Empresas)El fĂștbol ha evolucionado bastante desde su creaciĂłn en 1863 y se ha convertido en el deporte mĂĄs popular del mundo y en un mercado enorme. Los principales clubes de fĂștbol se convirtieron en grandes empresas con presupuestos enormes y con una necesidad importante de inversiones que les llevaron hasta los mercados financieros con poco Ă©xito. Para adaptarse a las necesidades de los mercados financieros, los clubes de fĂștbol tuvieron que modificar su estructura administrativa, jurĂ­dica, financiera, contable y tributaria. TambiĂ©n los clubes tuvieron que transformarse en sociedad mercantil para aumentar sus ingresos. Todo esto dio nacimiento al estatuto de SADP. Una vez esta transformaciĂłn de estatuto efectuada, los clubes pueden preparar su entrada en los mercados financieros acompañada de la creaciĂłn de sistemas de informaciĂłn financiera para informar sus accionistas potenciales de su salud financiera y de su capacidad a generar recursos. Sin embargo, los clubes de fĂștbol profesionales no se comportan como una empresa tradicional y su actividad es muy dependiente de los resultados deportivos por definiciĂłn inciertos. Eso hace que los inversionistas dudan de la capacidad que tienen los clubes para hacer beneficios y no los encuentran una inversiĂłn lo suficiente segura. Entonces, los clubes deben asegurar sus ingresos y desensibilizarles de sus resultados deportivos para entregar a sus inversionistas la seguridad que buscan

    Competing types of quantum oscillations in the 2D organic conductor (BEDT-TTF)8Hg4Cl12(C6H5Cl)2

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    8 pages, 8 figures.Interlayer magnetoconductance of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Cl)2 has been investigated in pulsed magnetic fields extending up to 36 T and in the temperature range from 1.6 to 15 K. A complex oscillatory spectrum, built on linear combinations of three basic frequencies only is observed. These basic frequencies arise from the compensated closed hole and electron orbits and from the two orbits located in between. The field and temperature dependencies of the amplitude of the various oscillation series are studied within the framework of the coupled orbits model of Falicov and Stachowiak. This analysis reveals that these series result from the contribution of either conventional Shubnikov-de Haas effect (SdH) or quantum interference (QI), both of them being induced by magnetic breakthrough. Nevertheless, discrepancies between experimental and calculated parameters indicate that these phenomena alone cannot account for all of the data. Due to its low effective mass, one of the QI oscillation series - which corresponds to the whole first Brillouin zone area - is clearly observed up to 13 K

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