In preparation for his upcoming show at Eli Klein Fine Art, Beijing-based artist Liu Bolin collaborated with fellow photographer JR for a piece in New York City. Located on the corner of Elizabeth and Spring Street, the mural itself comes from a photograph JR shot of Bolin that seems to capture the artist perfectly. Stay tuned for Part 2 of their collaboration in the coming days.method introduces a time delay at the beginning of an engine NOx spike before urea dosing begins (or ramps up), and a time delay after the NOx spike before urea dosing ends (or ramps down). Ordinarily, an engine NOx spike will cause a temperature increase in the exhaust gas and SCR catalyst, which may result in the release of stored ammonia on the catalyst. This is especially true when engine power output is used as a substitute for directly estimating engine NOx emissions. The ammonia release provides ammonia for reducing engine out NOx while delaying urea injection prevents excess ammonia from slipping out the exhaust. On the NOx decrease, normally the temperature of the engine exhaust and SCR catalyst decrease, and therefore continued urea injection (the delay before