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A heat source focuses its heat over a powder base material and heats the selected cross section area .
 concept or principle: heat source; concept or principle: heat; material: powder; material: material; concept or principle: cross section; process parameter: area
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:
 concept or principle: heat source; concept or principle: heat; material: powder; material: material; concept or principle: cross section; process parameter: area