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In contrast , lower laser beam irradiance resulted in a more stable process with increased cooling rates , which favourably influenced the refinement of the solidification microstructure .
 concept or principle: laser beam; concept or principle: process; process parameter: cooling rates; concept or principle: solidification microstructure
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: laser beam, process, cooling rates, solidification microstructure 
Answer:
 concept or principle: laser beam; concept or principle: process; process parameter: cooling rates; concept or principle: solidification microstructure