A content analysis of rap music videos taken from the end of year countdowns aired on U.S. cable outlets (i.e. BET, MTV, and VH1) was undertaken. The analysis examined the body images of 258 female characters (87.6% Black, 5.8% White, 6.6% other) as a function of the thematic content in the videos (e.g., violence, sex). It was found that, overall, "thin" females were overrepresented in the videos. More interestingly, the body sizes of the female characters varied by three of the four video themes. When the music videos were high in sex, or high in materialism, women were more likely to have smaller body sizes. In contrast, when the videos were high in political awareness, women were more likely to have larger body sizes.

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The pulsation and translation of two cavitation bubbles are studied numerically in sound field. The results show that bubbles’ pulsation driven by the sound makes them translate. Different pulsations lead to different translations. Two bubbles will be mutually attractive to each other if they pulsate in phase, while they will be repulsive if out of phase. Furthermore, the secondary Bjerknes force for small phase difference is attractive, and it becomes repulsive for other phase differences up to π phase difference due to the nonlinear effect, although the attractive strength between two bubbles is much larger than the repulsive strength. Finally, one bubble pulsation and the other bubble stationary make the bubbles repel each other.

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