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Bulk mode shapes based on rectangular plates, square plates, and circular disks: (a) length-extensional (LE) mode, β = 1, λ = 2L; (b) width-extensional (WE) mode, β = 1, λ = 2W; (c) square-extensional (SE) mode, β = 1, λ = 2L; (d) radial breathing mode, β = 1, λ = 2R.
