4363
In this study , conventional principles of casting hydrodynamics is advanced by validated novel numerical models for novel sprue designs to improve melt flow control .
 manufacturing process: casting; machine or equipment: sprue; engineering feature: designs; concept or principle: melt flow
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: casting, sprue, designs, melt flow 
Answer:
 manufacturing process: casting; machine or equipment: sprue; engineering feature: designs; concept or principle: melt flow