815
As the vapor plume , and how effectively it is removed by the shielding gas flow , have a significant effect on the melt pool geometry in laser powder bed fusion , models aiming at predicting the melt pool geometry and attempts to transfer process parameters from one machine to another should consider the effect of the shielding gas flow .
 material: As; concept or principle: gas; material: melt pool; concept or principle: geometry; manufacturing process: laser powder bed fusion; material: melt pool; concept or principle: geometry; concept or principle: process parameters; machine or equipment: machine; concept or principle: gas
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: As, gas, melt pool, geometry, laser powder bed fusion, melt pool, geometry, process parameters, machine, gas 
Answer:
 material: As; concept or principle: gas; material: melt pool; concept or principle: geometry; manufacturing process: laser powder bed fusion; material: melt pool; concept or principle: geometry; concept or principle: process parameters; machine or equipment: machine; concept or principle: gas