The processes and apparatus of the present invention concerns melt spinning high viscosity fluoropolymers into single filaments or multi-filament yams at high spinning speeds, the melt spinning being carried out at a temperature which is at least 90 C. The image forming apparatus includes an image forming means for forming an unfixed image t on a recording material P, and a fixing means 10 for heat-fixing the unfixed image. Annular projections 11, 21 are formed on first and second fluid supplydischarge port portions 1A, 2A. Decomposition of each item into a corresponding rowset column is accomplished by collecting the item content from the markup based document and storing it in the corresponding rowset column, for later storage in a database table. The data overlapskip detection circuit determines if data is overlapped or skipped according to the phase signal and the last phase signal. Each of the channel estimator and the channel length determination unit independently receive the wireless signal.