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Based on these results , the authors present an enhanced process model of isothermal laser sintering , which considers material solidification in z-direction during part build-up .
 concept or principle: process model; concept or principle: isothermal; manufacturing process: sintering; material: material; engineering feature: z-direction
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: process model, isothermal, sintering, material, z-direction 
Answer:
 concept or principle: process model; concept or principle: isothermal; manufacturing process: sintering; material: material; engineering feature: z-direction