The composition of an object within a wireless communication channel is determined by analyzing a symmetry characteristic of a polarization pattern of a received signal. The method comprises displaying a graphical user interface element on the touch sensitive display screen. Through each channel, every node is coupled to communicate data with every other node. Light injected into the first structure is directed into the third structure where it is redirected so that it propagates out of the third structure uniformly and efficiently and in a direction that is substantially perpendicular to the surface of the third structure. The preparation method may effectively reduce iodine content of polyarylene sulfide to prevent corrosion of post processing equipment, improve properties of polyarylene sulfide such as thermal stability, and the like, and thus, it may be usefully applied in the industrial field relating to preparation of polyarylene sulfide. Queries are formulated from the user search and transferred to each selected supplier over a network coupling.