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 gyro sandwich. Doner meat being cut off the spit with a knife. A stack of fresh pita bread which is used in making gyro sandwiches. Spice-rubbed roast chicken is a staple in gyros and other Greek dishes. Mustard may be served with a gyro sandwich.op 10 facts about the world. A gyro sandwich consists of various rotisseried meats, salad vegetables such as tomatoes, lettuce and onions, along with a yogurt-based tzatziki sauce. These ingredients are placed on a hearty form of grilled pita bread and served as a wrap sandwich.