Therefore, for the experimentalist, the analytically determined correction for displacement of a particle near a moving wall, equation(38) ��(G,zt)=GD��(zt)Pe����x��,is an important one. In particular, it is commonly assumed that the direct balance of hydrodynamic drag with the harmonic force determines the well stiffness: G?=Pe/[����x��D��(zt)]. This we saw is true only far from the wall (as zt��


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