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(a) Propagation of guided waves in an elastic plate. When the transient shear waves generated at the centre of the plate propagate in opposite directions, the wavefronts change constantly. (b) Dispersion relation of the antisymmetric and symmetric modes of the Lamb wave. (c) The simplified model used in GWE of the arterial wall. (d) The dispersion relations of the A0 mode in elastic plates in vacuum and immersed in water. (Online version in colour.)
