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In this study , through in-situ temperature measurement , the heat accumulation and thermal behaviour during the gas tungsten wire arc additive manufacturing ( GT-WAAM ) process are presented .
 concept or principle: in-situ; process characterization: measurement; machanical property: heat accumulation; concept or principle: gas; manufacturing process: wire arc additive manufacturing; concept or principle: process
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: in-situ, measurement, heat accumulation, gas, wire arc additive manufacturing, process 
Answer:
 concept or principle: in-situ; process characterization: measurement; machanical property: heat accumulation; concept or principle: gas; manufacturing process: wire arc additive manufacturing; concept or principle: process