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These amorphous regions also resulted in decreased x-ray diffraction intensities with increasing porosity .
 process characterization: x-ray diffraction; machanical property: porosity
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: x-ray diffraction, porosity 
Answer:
 process characterization: x-ray diffraction; machanical property: porosity