675
Temperature gradient was observed to be much larger at the front of the melt pool due to the effect of thermal conductivity , and decreased from center to the periphery .
 process parameter: Temperature gradient; material: be; material: melt pool; machanical property: thermal conductivity
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:
 process parameter: Temperature gradient; material: be; material: melt pool; machanical property: thermal conductivity