“…O n the other hand, supersonic waves were studied by Bondi [I]. More recently there are articles by Lighthill [I51 and Buchwald [3] on waves produced by a periodically varying source. Asymptotic estimates at large distances in this problem can be related to features of the wave fronts from our instantaneous point source.…”
“…O n the other hand, supersonic waves were studied by Bondi [I]. More recently there are articles by Lighthill [I51 and Buchwald [3] on waves produced by a periodically varying source. Asymptotic estimates at large distances in this problem can be related to features of the wave fronts from our instantaneous point source.…”
“…With the free surface containing the axis of rotational symmetry, he obtained slowness as well as group velocity curves (wave curves) for several materials for the case a = 0°. Figure 2 shows the group velocity diagram for apatite, taken from Reference [7]; for fiber angle ai-0°, the diagrams are to be accordingly rotated. The difficulties involved with the evaluation of ngen(i!…”
“…Using the method discussed in [13], ~ is represented in terms of the pseudopotentials, e. <P, and 1/J in the following form, where, e = f,(z)ei(kx+ly-wt)…”
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