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The purpose of the current research was to investigate the acquisition of absolute surface temperatures using in situ IR imaging of the melted or solid surfaces layer-by-layer during fabrication within an electron beam melting ( EBM ) system .
 concept or principle: research; concept or principle: surface; concept or principle: in situ; application: imaging; concept or principle: melted; concept or principle: surfaces layer-by-layer; manufacturing process: fabrication; manufacturing process: electron beam melting; manufacturing process: EBM
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: research, surface, in situ, imaging, melted, surfaces layer-by-layer, fabrication, electron beam melting, EBM 
Answer:
 concept or principle: research; concept or principle: surface; concept or principle: in situ; application: imaging; concept or principle: melted; concept or principle: surfaces layer-by-layer; manufacturing process: fabrication; manufacturing process: electron beam melting; manufacturing process: EBM