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In this paper , we model non-isothermal polymer relaxation , entanglement recovery , and diffusion processes that occur post-extrusion to investigate the effects that typical printing conditions and amorphous ( non-crystalline ) polymer rheology have on the ultimate weld structure .
 concept or principle: model; material: polymer; concept or principle: diffusion; material: polymer; engineering feature: weld; concept or principle: structure
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: model; material: polymer; concept or principle: diffusion; material: polymer; engineering feature: weld; concept or principle: structure