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From the simulations follows that an optimal sintering process has a low ambient temperature , a narrow beam width with enough power to heat the particles only a few degrees above the melting temperature , and a polymer of which the viscosity decreases significantly within these few degrees .
 enabling technology: simulations; manufacturing process: sintering; concept or principle: process; process parameter: temperature; machine or equipment: beam; process parameter: power; concept or principle: heat; concept or principle: particles; process parameter: melting temperature; material: polymer; machanical property: viscosity
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: simulations, sintering, process, temperature, beam, power, heat, particles, melting temperature, polymer, viscosity 
Answer:
 enabling technology: simulations; manufacturing process: sintering; concept or principle: process; process parameter: temperature; machine or equipment: beam; process parameter: power; concept or principle: heat; concept or principle: particles; process parameter: melting temperature; material: polymer; machanical property: viscosity