An optical backhaul network for a wireless broadband service is provided. The method includes: providing a suspension of the particles in a suspending medium; and flowing the suspension along a channel, such that the flowing suspension occupies a certain volume that has at least one cross-sectional dimension smaller than 100 \u03bcm. In some embodiments, the well-known \u201cene\u201d reaction can be used to cure the compositions described herein, and therefore no catalyst is required. The time elapsing between the first and second signals is measured to provide a CFT index indicative of the patient’s condition. Upon shutdown of the furnace, inert gas is fed from below to the furnace for purging of gas in the fluidized bed with inert gas while steam is supplied to a freeboard section above the fluidized bed to purge a gas in the freeboard section with steam.