Author:Mafusire, C; Forbes, A; Snedden, Glen C; Mahlase, Andrew CK; Michaelis, MM; Mathuthu, MDate:Jul 2006When a heated pipe is rotated, the dynamics of the gas inside exhibit properties reminiscent of a solid-state positive lens. The properties are a result of a parabolic distribution of refractive index in the pipe which is caused by mixing of ...Read more