Abstract: Disclosed is an integrated circuit with a metallization stack that has thermal tower assemblages formed from wires in two or more metal layers to assist in dissipating heat out of the metallization stack.

Abstract: A broadband acoustic lens and method of designing same is provided for focusing an incident acoustic wave. The broadband lens includes a plurality of concentric rings, where each concentric ring of the plurality of concentric rings has a ring width, and a plurality of gaps, where each gap of the plurality of gaps has a spacing. The concentric rings are separated by a spacing corresponding to a gap of the plurality of gaps. The widths of the plurality of concentric rings and the spacings of the plurality of gaps are arranged such that the incident acoustic wave is focused to a spot within a sub-wavelength of the incident acoustic wave in air. The arrangement of the widths of the plurality of concentric rings and spacings of the plurality of gaps is aperiodic.

Abstract: A unique climbing structure that is durable, lightweight and easy to assemble is provided. The structure is based on the use of polystyrene foam blocks attached to a support structure. The polystyrene can be cut to be irregularly shaped like a normal rock, and can be shaped with larger dimensions and depth than other techniques, giving a more realistic structure. The shaped polystyrene foam is covered with a hard coating to give the exterior a rock-like appearance.