Abstract: A computer implemented method is provided for optimizing at the time of compiling a program that employs a message-passing interface (MPI). The method includes: detecting an MPI application source file; identifying a non-blocking communication within the MPI application source file; and overlapping independent computation concurrently with the non-blocking communication. A system is also provided.

Abstract: A selective catalytic reduction apparatus has at least first and last catalyst layers in series for reducing nitrogen oxides in a flue gas, at least one interstage heat exchanger located after the first layer and before the last layer, that lowers flue gas temperature, and that acts as a mixing body to lower the standard deviation of the NH3/NO ratio entering catalyst layers after the first catalyst layer, thus providing better consumption of both ammonia and NOx in the reactor than would be achieved in the absence of the at least one interstage heat exchanger.

Abstract: Pillared interlayered clay catalysts (PILC) are formed and used in the selective reduction (SCR) of nitrogen oxides (NO.sub.x) in exhaust gases in the presence of ammonia. Cr.sub.2 O.sub.3 -PILC, Fe.sub.2 O.sub.3 PILC, TiO.sub.2 -PILC, ZrO.sub.2 -PILC and Al.sub.2 O.sub.3 -PILC each have considerable activities in the SCR of NO by NH.sub.3. Forming the catalysts in a bimodal pore structure provides increases poison resistance and increases reaction rates. Doping the catalyst with CeO.sub.2 and/or Ce.sub.2 O.sub.3 can promote increased activities. The PILC SCR catalysts do not oxidize SO.sub.2 to undesirable SO.sub.3 in any detectable amount.