Abstract: A spray device mounted on a non-motor vehicle (T-car) selected from among commercial or novel electric vehicles so as to improve air quality inside a tunnel by spraying water during operation, collecting pollutants floating inside a subway tunnel, and collecting and sinking fine dust generated by means of the operation of a train onto the road. The spray device is mounted on a lower portion of the non-motorized vehicle (T-car) from among commercial or new electromotive cars, pressurized water is supplied to a distribution pipe on a discharging side by means of a pressurizing motor and a pump, and a jet is sprayed through a spray nozzle coupled to the distribution pipe. Also, it is possible to automatically spray a jet onto a rail surface while a train moves on a ground-level railway using a sensor and a control board.

Abstract: The invention provides a novel compound of Formula II which is useful in the preparation of imipenem monohydrate of Formula I, wherein R1 is a p-nitrobenzyl or p-methoxybenzyl group; and R2 and R3 may be identical to or different from each other and are each independently a C1-6alkyl or aryl group, or a derivative thereof, and a process for preparing the compound of Formula II by coupling (5R,6S) p-nitrobenzyl-3-(diphenylphosphono)-6-[(1R)-1-hydroxyethyl]-1-azabicyclo[3.2.0]hept-2-ene-7-one-2-carboxylate with 2-aminoetahnethiol hydrocloride in the presence of a base, followed by a reaction with a ketone. Further, the invention provides a process for preparing the compound of Formula I by reacting a compound of Formula II with isopropylformimidate or benzylformimidate in the presence of a base, followed by hydrogenation, separation and crystallization.