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cooling rates , temperature gradients and solidification velocities were simulated by a FEM heat flow model and correlated with the solidification microstructure .
 process parameter: cooling rates; process parameter: temperature gradients; process parameter: solidification velocities; concept or principle: FEM; concept or principle: model; concept or principle: correlated; 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: cooling rates, temperature gradients, solidification velocities, FEM, model, correlated, solidification microstructure 
Answer:
 process parameter: cooling rates; process parameter: temperature gradients; process parameter: solidification velocities; concept or principle: FEM; concept or principle: model; concept or principle: correlated; concept or principle: solidification microstructure