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The paper studies the dynamics of a Bose-Einstein condensate loaded into a 1Dparabolic optical lattice, and excited by a sudden shift of the lattice center.Depending on the magnitude of the initial shift, the condensate undergoeseither dipole or Bloch oscillations. The effects of dephasing and of atom-atominteractions on these oscillations are discussed.Comment: 3 pages, to appear in proceeding of LPHYS'05 conference (July 4-8,  2005, Kyoto, Japan

Dipole and Bloch oscillations of cold atoms in a parabolic lattice