57 research outputs found
European integration at the crossroads: Democratic deepening for stability, solidarity and social justice. EuroMemorandum 2012
European integration at the crossroads: Democratic deepening for stability, solidarity and social justice. EuroMemorandum 2012
Direct observation of the turbulent emf and transport of magnetic field in a liquid sodium experiment
International audienceFor the first time, we have directly measured the transport of a vector magnetic field by isotropic turbulence in a high Reynolds number liquid metal flow. In analogy with direct measurements of the turbulent Reynolds stress (turbulent viscosity) that governs momentum transport, we have measured the turbulent electromotive force (emf) by simultaneously measuring three components of velocity and magnetic fields, and computed the correlations that lead to mean-field current generation. Furthermore, we show that this turbulent emf tends to oppose and cancel out the local current, acting to increase the effective resistivity of the medium, i.e., it acts as an enhanced magnetic diffusivity. This has important implications for turbulent transport in astrophysical objects, particularly in dynamos and accretion disks
A hierarquia monetária e suas implicações para as taxas de câmbio e de juros e a política econômica dos países periféricos
Institutional investors’ role in diversifying orientation decision across Tunisian companies
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