The invention provides an automatic bandwidth adjustment method and system in a passive optical network comprising an optical line terminal connected to a plurality of optical network units. The prefabricated segmental concrete filled tube member has a hollow pipe filled therein with concrete, and a connection flange shaped in a ring radially extending from the peripheries of both ends of the pipe, wherein the segmental concrete filled tube member is integrally connected with another adjacent segmental concrete filled tube member by the connection flange. Still more specifically, the invention relates to nonaqueous gels made with diblock copolymers that reduce the Reid Vapor Pressure of gelled gasoline and lower the total volatility of gelled hydrocarbon solvents. The deodorized oil is completely bland, unchanged in the concentration of the long-chain highly unsaturated fatty acids, very low in color, peroxides and secondary oxidation products, free of pesticides and has very good flavor stability. The fold-up reflector with its reflective inserts directs reflected light to a predetermined area to provide improved area lighting with less light scatter and improved efficiency. This enables the combination of time domain semblances from the same depth in the wellbore.