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Airborne particle concentrations ( < 300 nm ) showed transient peaks in the AM facility but were lower than those of the welding facility .
 concept or principle: particle; concept or principle: transient; manufacturing process: AM; manufacturing process: welding
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: particle; concept or principle: transient; manufacturing process: AM; manufacturing process: welding