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The simulation results are confirmed by experimental measurements of the powder particle density distribution in the working plane , by measurements of the oxygen volume percentage at the workpiece surface , by high-speed camera images of the melt pool surface and by absorptivity measurements , which show the effect of oxidation on the process .
 enabling technology: simulation; concept or principle: experimental; material: powder particle; machanical property: density distribution; material: oxygen; concept or principle: workpiece; concept or principle: surface; machine or equipment: camera; material: melt pool; manufacturing process: oxidation; concept or principle: process
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: simulation, experimental, powder particle, density distribution, oxygen, workpiece, surface, camera, melt pool, oxidation, process 
Answer:
 enabling technology: simulation; concept or principle: experimental; material: powder particle; machanical property: density distribution; material: oxygen; concept or principle: workpiece; concept or principle: surface; machine or equipment: camera; material: melt pool; manufacturing process: oxidation; concept or principle: process