We analyze the problem of suppressing the unwanted component of a time-harmonic acoustic field (noise) on a predetermined region of interest. The suppression is rendered by active means, i.e., by introducing the additional acoustic sources called controls that generate the appropriate...

A model of polar fluid is studied theoretically. The interaction potential, in addition to dipole–dipole term, possesses a dispersion contribution of the van der Waals–London form. It is found that when the dispersion force is comparable to dipole–dipole interaction, the fluid separates...