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Among the high number of factors influencing part quality and mechanical properties , the inter layer time ( ILT ) between iterative melting of volume elements in subsequent layers is almost completely unappreciated in the relevant literature on L-PBF .
 concept or principle: quality; concept or principle: mechanical properties; process parameter: layer; manufacturing process: melting; concept or principle: volume; material: elements; manufacturing process: L-PBF
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: quality, mechanical properties, layer, melting, volume, elements, L-PBF 
Answer:
 concept or principle: quality; concept or principle: mechanical properties; process parameter: layer; manufacturing process: melting; concept or principle: volume; material: elements; manufacturing process: L-PBF