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The model analytically couples the moving laser beam with Gaussian energy distribution , the powder stream and the semi-infinite substrate together , while considering the attenuated laser power intensity distribution , the heated powder spatial distribution and the melt pool 3D shape with its boundary variation .
 concept or principle: model; concept or principle: laser beam; concept or principle: Gaussian; concept or principle: distribution; material: powder; material: substrate; process parameter: laser power; concept or principle: distribution; material: powder; concept or principle: distribution; material: melt pool; concept or principle: 3D; engineering feature: boundary
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: model, laser beam, Gaussian, distribution, powder, substrate, laser power, distribution, powder, distribution, melt pool, 3D, boundary 
Answer:
 concept or principle: model; concept or principle: laser beam; concept or principle: Gaussian; concept or principle: distribution; material: powder; material: substrate; process parameter: laser power; concept or principle: distribution; material: powder; concept or principle: distribution; material: melt pool; concept or principle: 3D; engineering feature: boundary