1953
In the second example , a minimum AM feature size is embedded into the density based TO process and allows to define arbitrary objective functions for multi-physic fields , which is crucial for gradient-based , and thus all topology optimization .
 manufacturing process: AM; machanical property: density; concept or principle: process; engineering feature: topology optimization
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:
 manufacturing process: AM; machanical property: density; concept or principle: process; engineering feature: topology optimization