In one embodiment, a method is provided for customization of a mobile communications device’s data session retry mechanism in a wireless packet data service network. Moreover, the pellet has a separation surface between a heavily impregnated zone and a zone which is not impregnated or weakly impregnated so that the said separation surface comprises at least a hollow part facing the emissive surface. Additionally, each bollard includes a base element that provides vertical stability to the vertical element and a plurality of internal components. Position feedback P1 of a driven element is subtracted from position command Pc to obtain first position deviation \u03b51. The crank is further capable of orienting the first and second ones of the said two or more operational members for placement of the first and second ones of said randomly placed items into a desired oriented condition. The controller can be calibrated according to the type andor temperature of the fluid.