9,232 research outputs found

    Metabolic syndrome and the immunological affair with the blood-brain barrier

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    Copyright © 2015 Mauro, De Rosa, Marelli-Berg and Solito. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms

    Switching of Magnetic Moments of Nanoparticles by Surface Acoustic Waves

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    We report evidence of the magnetization reversal in nanoparticles by surface acoustic waves (SAWs). The experimental system consists of isolated magnetite nanoparticles dispersed on a piezoelectric substrate. Magnetic relaxation from a saturated state becomes significantly enhanced in the presence of the SAW at a constant temperature of the substrate. The dependence of the relaxation on SAW power and frequency has been investigated. The effect is explained by the effective ac magnetic field generated by the SAW in the nanoparticles.Comment: Accepted in Europhysics Letter

    Cria e recria das poedeiras coloniais Embrapa 051.

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    Cria e recria das poedeiras de ovos castanhos Embrapa 031.

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    Time-Dependent Invariants and Green's Functions in the Probability Representation of Quantum Mechanics

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    In the probability representation of quantum mechanics, quantum states are represented by a classical probability distribution, the marginal distribution function (MDF), whose time dependence is governed by a classical evolution equation. We find and explicitly solve, for a wide class of Hamiltonians, new equations for the Green's function of such an equation, the so-called classical propagator. We elucidate the connection of the classical propagator to the quantum propagator for the density matrix and to the Green's function of the Schr\"odinger equation. Within the new description of quantum mechanics we give a definition of coherence solely in terms of properties of the MDF and we test the new definition recovering well known results. As an application, the forced parametric oscillator is considered . Its classical and quantum propagator are found, together with the MDF for coherent and Fock states.Comment: 29 pages, RevTex, 6 eps-figures, to appear on Phys. Rev.

    Produção de ovos das poedeiras de ovos castanhos Embrapa 031.

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    Materiais alternativos, em substituição à maravalha como cama de frangos.

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    bitstream/item/58061/1/CUsersPiazzonDocuments465.pdfProjeto n. 01.02.10.406.0
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