Various embodiments include apparatus, methods, and systems for column navigation within a view of a table or other source of two-dimensional data. Uniform rate scrambling and quasi-uniform rate scrambling modes are provided in described devices and rate-additive designs based on multiple cascaded devices are also disclosed to achieve high-speed scrambling. When recovering a polymer from a polymer solution having a high viscosity, an infusion of water or steam serves to reduce the viscosity of the polymer solution and also to increase the linear velocity of a gas, whereby preventing the occlusion of a pipe and facilitating the operation. The ultrasound assembly comprises an ultrasound radiating member mounted on an elongate support structure.