1596
Density and porosity properties were investigated and it was discovered that high porosity metal parts can be produced by using a low laser power and high scan speed .
 engineering feature: Density and porosity; machanical property: porosity; material: metal; material: be; process parameter: laser power; process parameter: scan speed
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:
 engineering feature: Density and porosity; machanical property: porosity; material: metal; material: be; process parameter: laser power; process parameter: scan speed