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Unlike conventional powder metallurgy techniques , selective laser melting ( SLM ) is characterised by its fully melting process and very high heating and cooling rates and little has been known about the influence of powder surface state on the SLM process .
 manufacturing process: powder metallurgy; manufacturing process: selective laser melting; manufacturing process: SLM; manufacturing process: melting; manufacturing process: heating; process parameter: cooling rates; material: powder; manufacturing process: SLM; concept or principle: process
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: powder metallurgy, selective laser melting, SLM, melting, heating, cooling rates, powder, SLM, process 
Answer:
 manufacturing process: powder metallurgy; manufacturing process: selective laser melting; manufacturing process: SLM; manufacturing process: melting; manufacturing process: heating; process parameter: cooling rates; material: powder; manufacturing process: SLM; concept or principle: process