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The results showed that filament-like structures with a smooth surface and a nearly homogeneous cross section could be produced for suspensions with a dff of 44 % or higher .
 concept or principle: smooth surface; concept or principle: homogeneous; concept or principle: cross section; material: be
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: smooth surface; concept or principle: homogeneous; concept or principle: cross section; material: be