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These process models are validated against published experimental data , then used to generate process diagrams which reveal that high normal loads and high sonotrode velocities can reduce intermetallic growth while maintaining strong interlayer bonding .
 concept or principle: process models; concept or principle: experimental data; concept or principle: process; machine or equipment: sonotrode; material: intermetallic; concept or principle: bonding
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: process models; concept or principle: experimental data; concept or principle: process; machine or equipment: sonotrode; material: intermetallic; concept or principle: bonding