In the presence of a steady ambient illuminance there occur two changes in the horizontal-cell incremental response; 1) The incremental sensitivity decreases which is WeberFechner like phenomena. 2) The response becomes faster . The response to a modulation around a mean is linear: This is a piecewise linearization. With the classical spot-annular experiment, a steady annulus of light increases...

this paper discusses the performance evaluation and availability analysis of ammonia synthesis unit of a fertilizer plant. the fertilizer plant is a complex and repairable engineering system comprises of various units viz. shell gasification and carbon recovery, desulphurization, co-shift conversion, decarbonation, nitrogen wash and ammonia synthesis etc. one of the most important functionaries...