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    Resonant electron heating and molecular phonon cooling in single C60_{60} junctions

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    We study heating and heat dissipation of a single \c60 molecule in the junction of a scanning tunneling microscope (STM) by measuring the electron current required to thermally decompose the fullerene cage. The power for decomposition varies with electron energy and reflects the molecular resonance structure. When the STM tip contacts the fullerene the molecule can sustain much larger currents. Transport simulations explain these effects by molecular heating due to resonant electron-phonon coupling and molecular cooling by vibrational decay into the tip upon contact formation.Comment: Accepted in Phys. Rev. Let

    Brotação da variedade Merlot (Vitis vinifera L.) na região da Campanha Gaúcha em função do tipo de poda e doses de cianamida hidrogenada.

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    Os objetivos deste trabalho foram avaliar a necessidade de uso e a seleção da dose de CH para promover a brotação uniforme de 'Merlot', conduzida em dois sistemas de poda, nas condições edafoclimáticas da Campanha
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