6040
The Rumpf approach to relate interparticle forces to the strength of powder agglomerates was used in this work to estimate the average strength of the sintered interparticle contacts starting from the tensile strength of specimens .
 concept or principle: forces; machanical property: strength; material: powder; concept or principle: average; manufacturing process: sintered; application: contacts; machanical property: tensile strength
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: forces, strength, powder, average, sintered, contacts, tensile strength 
Answer:
 concept or principle: forces; machanical property: strength; material: powder; concept or principle: average; manufacturing process: sintered; application: contacts; machanical property: tensile strength