Methods in accordance with the invention involve patterning and etching very small dimension pillars, such as in formation of a memory array in accordance with the invention. In the method, each of the user equipments separately calculates channel capacity information using a linear reception scheme and a nonlinear reception scheme, and feeds back the calculated channel capacity information to the base station. The aperture has a plurality of vanes extending towards a central ring. Estimates of the stress rotation are helpful for hydraulic fracturing operations, because fracture tends to occur in a plane perpendicular to the least principal stress. Examples may include checks pertaining to zero flow, interface, pressure, flow rate, fluid type and quality, backflow, dry qualification, temperature exposure limits, and so on, of the circuits and cartridge associated items. When the bag are to be disposed of, appropriate organic solvent is applied to the inner bag.