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Subsequently , the effects of process parameters , including wire feed speed ( WFS ) , torch travel speed ( TS ) , nozzle to work distance ( NTWD ) and torch angle , on the stability of positional deposition were investigated .
 concept or principle: process parameters; process parameter: feed; machine or equipment: nozzle; machanical property: stability; concept or principle: deposition
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 parameters; process parameter: feed; machine or equipment: nozzle; machanical property: stability; concept or principle: deposition