The invention relates to a membrane comprising a geotextile and a water impermeable cured cementitious composition which is disposed on at least one side of the geotextile. The piston separates, within the cylinder, a cylindrical working chamber from an annular chamber, which encloses the piston rod. A first light-exposure is conducted to transfer a pattern on a photomask to the first photoresist layer, thereby forming a first exposure pattern. The reactor effluent stream is treated to convert acetylene to another hydrocarbon, and in particular olefins. The aggregated data is processed to produce moving averages, stock purchase indices, and stock rankings. It is more effective as related N-alcylated-hydroxylamines with regard to mooney stability.