A method for preparing 1,4-biscarboxylic acid esters of benzene is provided. A plurality of software agents is configured to operate as a cooperative swarm to locate an optimum of an objective function. The phosphor thin film of quality is formed at low cost by a low-temperature process, enabling manufacture of full-color EL panels. A hybrid control unit controls the engine, the electric generator and the motor. 014 inch, and includes three plastic layers.