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The work presented here not only demonstrates the feasibility of a new non-melt fusion room temperature metal 3D printing approach—capable of producing metals with more than 99 percent density—but also presents both observational study and an initial theoretical basis upon which a new athermal microstructural transformation process may be understood Selective laser melting and other additive manufacturing ( AM ) techniques have recently attracted substantial interest of both researchers and the processing industry .
 concept or principle: feasibility; concept or principle: fusion; process parameter: temperature; material: metal; manufacturing process: 3D printing; material: metals; concept or principle: theoretical; concept or principle: microstructural; concept or principle: process; material: be; manufacturing process: Selective laser melting; manufacturing process: additive manufacturing; manufacturing process: AM; application: industry
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: feasibility, fusion, temperature, metal, 3D printing, metals, theoretical, microstructural, process, be, Selective laser melting, additive manufacturing, AM, industry 
Answer:
 concept or principle: feasibility; concept or principle: fusion; process parameter: temperature; material: metal; manufacturing process: 3D printing; material: metals; concept or principle: theoretical; concept or principle: microstructural; concept or principle: process; material: be; manufacturing process: Selective laser melting; manufacturing process: additive manufacturing; manufacturing process: AM; application: industry