453
Hardness and microstructural observations indicate that this size dependence was not due to an intrinsic change in material properties , but instead the effects of surface roughness on the geometry of the specimens .
 machanical property: Hardness; process characterization: microstructural observations; concept or principle: material properties; machanical property: surface roughness; concept or principle: geometry
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: Hardness, microstructural observations, material properties, surface roughness, geometry 
Answer:
 machanical property: Hardness; process characterization: microstructural observations; concept or principle: material properties; machanical property: surface roughness; concept or principle: geometry