| http://www.w3.org/ns/prov#value | - An apparatus as claimed in claim 6, wherein said control device controls intensities, phases and frequencies produced from said ultrasound sources, or the degree of superimposition of respective intensities, phases and frequencies on one another, or other external force other than the ultrasound beams, based on a distribution of the particles in the fluid, which has been obtained by said observing
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