Abstract:
Method and apparatus for installing, maintaining and decommissioning wind turbines, both onshore and offshore, comprises a crane having extendable legs that allow it to climb a tower that it is erecting in sections by engaging the tower by friction or mechanical interference. The crane may carry the wind turbine nacelle on its upper members during construction of the tower and may be fitted with a crane for handling tower sections, or it may carry an “A” crane for lifting the nacelle and its components once the tower is complete or for constructing heavy maintenance. The crane may be fitted with various lifting and handling means to facilitate maintenance or the installation, maintenance or removal or airfoil rotor blades.
Abstract:
A method and system for making an antenna structure and to corresponding antenna structures are disclosed. A method for making a feed structure for an antenna may include providing a polarizer body having a polarizer sidewall extending longitudinally between spaced apart ends. A portion of the polarizer sidewall is deformed to provide at least one polarizing structure that extends radially inwardly along an interior of the polarizer sidewall relative to adjacent portions of the polarizer sidewall. The method thus can be utilized to produce an antenna structure.
Abstract:
An elongated structural member that includes a plastic sleeve surrounding a filler composite material. The filler composite material includes ground rubber particles and a binder, wherein the granular particle size for the ground rubber particles ranges from 0.125 inches to 0.5 inches. When the binder is a concrete binder, ten to twenty percent by volume of the filler composite material is the concrete binder and eighty to ninety percent by volume of the filler composite material is the ground rubber particles. Moreover, when the binder is a resin binder, ten percent by volume of the filler composite material is the resin binder and ninety percent by volume of the filler composite material is the ground rubber particles.