- Engine Technology 17
- Automotive Engineering 12
- Transportation 9
- Fossil Fuels (incl. Carbon Capture) 8
- Engineering Thermodynamics, Heat and Mass Transfer 6
- Communications Engineering, Networks 5
- Quality Control, Reliability, Safety and Risk 5
- Energy Systems 4
- Artificial Intelligence 3
- Computer Communication Networks 3
- Data Mining and Knowledge Discovery 3
- Renewable and Green Energy 3
- Science, Humanities and Social Sciences, multidisciplinary 3
- Science, multidisciplinary 3
- Signal, Image and Speech Processing 3
- Circuits and Systems 2
- Engineering, general 2
- Environmental Engineering/Biotechnology 2
- Pollution, general 2
- Software Engineering 2