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The experiment showed that low laser power and high scanning speed caused incomplete melting of the powder material and resulted in high porosity in the components .
 concept or principle: experiment; process parameter: laser power; process parameter: scanning speed; manufacturing process: melting; material: powder material; machanical property: porosity; machine or equipment: components
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: experiment; process parameter: laser power; process parameter: scanning speed; manufacturing process: melting; material: powder material; machanical property: porosity; machine or equipment: components