Surface combustion burners or radiant tile burners in comparison produce nitrogen oxides' levels 60-70% less. Therefore John Joyce's research into low NO x burners revolved primarily around surface combustion techniques. Another issue was the effect combustion temperatures have on the formation of NO x.
soup sandwich. A slang term used by members of the United States Army to describe a fellow soldier whose performance is unsatisfactory. This term is often shortened to just soup.. The term expresses a state of extreme uselessness, which can be understood by considering the functionality and worth of soup between two slices of bread.
A cheesesteak, also known as a Philadelphia cheesesteak, Philly cheesesteak, cheesesteak sandwich, cheese steak, or steak and cheese, is a sandwich made from thinly sliced pieces of steak and melted cheese in a long hoagie roll. A popular regional fast food, it has its roots in Philadelphia.