id	keyword
american_scientific_journal-5883	combustion
american_scientific_journal-5883	engineering
american_scientific_journal-5883	journal
american_scientific_journal-5883	fuel
american_scientific_journal-5883	ethanol
american_scientific_journal-5883	vol
american_scientific_journal-5883	diesel
american_scientific_journal-5883	emissions
american_scientific_journal-5883	chemical
american_scientific_journal-5883	equilibrium
american_scientific_journal-5883	air
american_scientific_journal-5883	temperature
american_scientific_journal-5883	co2