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In an FEA of a beam under three-point bending it was determined that the stiffness of the explicit cellular model increased with greater gradient density and lower cell size , approaching the implicit i.e .
 machine or equipment: beam; process characterization: three-point bending; machanical property: stiffness; concept or principle: model; machanical property: density; machanical property: cell size
Please list all entity words in the text that fit the category.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} 
Answer:
 machine or equipment: beam; process characterization: three-point bending; machanical property: stiffness; concept or principle: model; machanical property: density; machanical property: cell size