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In order to estimate the heat loss to the powder bed during the process , convective heat transfer is widely used as thermal boundary condition in finite element modeling of laser powder fusion processes .
 heat, powder bed, process, heat transfer, as, boundary condition, finite element, laser, fusion
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:
 heat, powder bed, process, heat transfer, as, boundary condition, finite element, laser, fusion