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As part of an effort to improve the resolution and surface roughness of EBM fabricated components , this study investigates the feasibility of fabricating components with a smaller powder size fraction and layer thickness ( similar to laser based processes ) .
 material: As; process parameter: resolution; machanical property: surface roughness; manufacturing process: EBM; machine or equipment: components; concept or principle: investigates; concept or principle: feasibility; manufacturing process: fabricating; machine or equipment: components; material: powder; concept or principle: fraction; process parameter: layer thickness; enabling technology: laser; concept or principle: processes
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: As, resolution, surface roughness, EBM, components, investigates, feasibility, fabricating, components, powder, fraction, layer thickness, laser, processes 
Answer:
 material: As; process parameter: resolution; machanical property: surface roughness; manufacturing process: EBM; machine or equipment: components; concept or principle: investigates; concept or principle: feasibility; manufacturing process: fabricating; machine or equipment: components; material: powder; concept or principle: fraction; process parameter: layer thickness; enabling technology: laser; concept or principle: processes