A method of providing operating electrical power from a stationary power source to a mobile conveyor utilized in material handling at a mine site as the conveyor moves over a predetermined path at the site without having to move long lengths of cable as the conveyor moves away from the power source. These substances are shown to have the biological activity associated with A-type IPG fractions, namely regulating lipogenic activity and inhibiting cAMP dependent protein kinase. The end portions of the plates 33, 34 of one panel 32 are friction-welded to the end portions of the plates 33, 34 of the other panel 32. The application of the present invention can significantly reduce the time for replacing a guide ring thereby cutting the maintenance cost, and further prevent the top ring module from cracking, wherein the cracking event is resulted from the force exerted by maintenance crew, and usually would cause the top ring module to be totally scrapped. In one implementation, a filled portion of the trench over the control port inhibits ions from implanting the dielectric material.