SCR Scientific & Educational Abbreviation

Selective Catalytic Reduction

This after–treatment technology reduces NOx emissions by using a urea–based additive, sometimes referred to as DEF. The ammonia in the urea mixes with engine exhaust gases in the SCR catalyst, converting NOx to nitrogen and water vapor.

Software Change Request

SuperCOSMOS-RECONS

Short Consensus Repeat

Sustain Cell Rate

Special Casualty Representative

Space Charge Region

Silicon Controlled Rectifier

Is a four-layer solid-state current-controlling device. The principle of four-layer p–n–p–n switching was developed by Moll, Tanenbaum, Goldey and Holonyak of Bell Laboratories in 1956.