A method and kit for enhancing the natural fertility process. The pressure sidewall includes a row of outlet slots for the circuit separated by converging partitions. These parameters are then input to a neural network, which then, based upon the input data, generates output data representative of the concentration of NOx in the flue gas. A visible-light-reflection layer is disposed on a surface of the phosphor film on a side thereof opposite from a space in which the discharge is generated.