9371
The microstructure evolution , sintering behavior of nanoparticles and mechanical properties of resistance spot welded stainless steel were characterized and analyzed .
 concept or principle: microstructure evolution; manufacturing process: sintering; concept or principle: nanoparticles; concept or principle: mechanical properties; manufacturing process: resistance spot welded; material: steel
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: microstructure evolution, sintering, nanoparticles, mechanical properties, resistance spot welded, steel 
Answer:
 concept or principle: microstructure evolution; manufacturing process: sintering; concept or principle: nanoparticles; concept or principle: mechanical properties; manufacturing process: resistance spot welded; material: steel