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The paper analyses the influence of arc energy and the thermal field on the resulting mechanical properties and microstructure of the material .
 concept or principle: arc; concept or principle: mechanical properties; concept or principle: microstructure; material: material
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: arc, mechanical properties, microstructure, material 
Answer:
 concept or principle: arc; concept or principle: mechanical properties; concept or principle: microstructure; material: material