An aluminum secondary battery exhibiting favorable characteristics is provided. At least one sheet of textured lamina having raised pointed structures is forced against a softer plain lamina so as to embed the structures therein. Other wireless devices are each affixed a respective item, and each of the other wireless devices determines if a reply signal is to be transmitted, and if so, communicates the reply signal to the first wireless device. The introduction of specialized particles into fluid promotes boundary layer mixing, thereby converting conduction to convection through the film. The bearing assembly is capable of bearing both radial and axial loads.