| http://www.w3.org/ns/prov#value | - However, conventionally, a mixture of fuel and air is ignited by using a spark plug to burn the mixture, and a temperature within a combustor is partially raised beyond 2000??? C. It is well-known that a large amount of nitrogen oxides (NOx) are produced in such a high temperature portion of the combustor, thereby bringing about a problem such as an environmental pollution.
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