| http://www.w3.org/ns/prov#value | - Meanwhile, as shown in FIG. 2, in the case that a mainlobe direction corresponds to an angle zero among the ultrasound field characteristics, the sidelobe direction is approximately distributed in discrete pattern in the angular direction of (??s)??????(n+0.5)??/D, where n is a positive integer, and the null direction is distributed in discrete pattern in the angular direction of sin(??null)=???n?
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