id	keyword
american_scientific_journal-7210	asphalt
american_scientific_journal-7210	carbon
american_scientific_journal-7210	sbs
american_scientific_journal-7210	aging
american_scientific_journal-7210	nanomaterials
american_scientific_journal-7210	carbon nanomaterials
american_scientific_journal-7210	performance
american_scientific_journal-7210	figure
american_scientific_journal-7210	temperature
american_scientific_journal-7210	technology
american_scientific_journal-7210	engineering