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This paper demonstrates acoustic emission ( AE ) sensing as a method of monitoring the flow of powder feedstock in a powder fed DED process .
 concept or principle: acoustic emission; application: sensing; material: as; machine or equipment: powder feedstock; material: powder; manufacturing process: DED
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: acoustic emission, sensing, as, powder feedstock, powder, DED 
Answer:
 concept or principle: acoustic emission; application: sensing; material: as; machine or equipment: powder feedstock; material: powder; manufacturing process: DED