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Through the use of fractal scan strategies , bulk density can be increased by 2 ± 0.7 % when compared to the ‘ island ’ scanning , demonstrating the potential of fractal scan strategies in the manufacture of typically ‘ unweldable ’ nickel superalloys .
 density, be, scanning, manufacture, nickel
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 density, be, scanning, manufacture, nickel