7095
In the present study , functionally graded support structures have been proposed and their thermal performance has been numerically investigated , with the consideration of different materials , cooling times and gradedness values .
 functionally graded, performance, materials, cooling
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 functionally graded, performance, materials, cooling