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The effect of spot density during pulsing , which relates to the amount of heating of the build area during processing , on the columnar-to-equiaxed transition of the solidification structure was studied both experimentally and theoretically .
 machanical property: density; manufacturing process: heating; process parameter: build area; concept or principle: transition; concept or principle: solidification
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: density, heating, build area, transition, solidification 
Answer:
 machanical property: density; manufacturing process: heating; process parameter: build area; concept or principle: transition; concept or principle: solidification