at(a - ao) d:,g-l(ao/a) = 0, then q'(a) is also continuous for all a > o.
Other interesting contributions on this subject are due to ' , and . A very good fit with these experimental results was obtained by Beris et al.  integrating the equation of motion by finite elements, thus also recovering the lower and upper estimates previously obtained by Yoshioka et al. . In all the papers listed here, the motion of a single sphere with a sufficiently large radius in an unsheared environment was considered. In the paper by Thomas ' an experiment of sedimentation in a sheared fluid was described.
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