1874
Motivated by these experimental results we used periodic homogenization theory to determine the combined effects of porosity and unit cell structure on the effective thermal conductivity .
 concept or principle: experimental; manufacturing process: homogenization; machanical property: porosity; concept or principle: unit cell; concept or principle: structure; process parameter: effective thermal conductivity
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: experimental, homogenization, porosity, unit cell, structure, effective thermal conductivity 
Answer:
 concept or principle: experimental; manufacturing process: homogenization; machanical property: porosity; concept or principle: unit cell; concept or principle: structure; process parameter: effective thermal conductivity