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A comparison of the surface quality , part density and mechanical properties of AlSi10Mg parts produced by LPBF , using different particle size distributions and morphologies , has been conducted .
 process parameter: surface quality; machanical property: density; concept or principle: mechanical properties; material: AlSi10Mg; manufacturing process: LPBF; concept or principle: particle size distributions; concept or principle: morphologies
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: surface quality, density, mechanical properties, AlSi10Mg, LPBF, particle size distributions, morphologies 
Answer:
 process parameter: surface quality; machanical property: density; concept or principle: mechanical properties; material: AlSi10Mg; manufacturing process: LPBF; concept or principle: particle size distributions; concept or principle: morphologies