6135
In this work , we restrict ourselves to varying the temperature-dependent viscosity , the process parameters , and the convective heat transfer coefficient of the sintering of two polymer ( polyamide 12 ) particles .
 machanical property: viscosity; concept or principle: process parameters; concept or principle: heat transfer; manufacturing process: sintering; material: polymer; material: polyamide 12; concept or principle: particles
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: viscosity, process parameters, heat transfer, sintering, polymer, polyamide 12, particles 
Answer:
 machanical property: viscosity; concept or principle: process parameters; concept or principle: heat transfer; manufacturing process: sintering; material: polymer; material: polyamide 12; concept or principle: particles