- Elementary Particles, Quantum Field Theory 40
- Quantum Field Theories, String Theory 38
- Classical and Quantum Gravitation, Relativity Theory 32
- Quantum Physics 32
- Soil Science & Conservation 19
- Characterization and Evaluation of Materials 17
- Metallic Materials 17
- Nuclear Physics, Heavy Ions, Hadrons 17
- Ecotoxicology 15
- Environmental Chemistry 13
- Inorganic Chemistry 12
- Materials Science, general 12
- Measurement Science and Instrumentation 12
- Physical Chemistry 12
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 12
- Agriculture 11
- Nanotechnology 11
- Industrial Chemistry/Chemical Engineering 10
- Surfaces and Interfaces, Thin Films 10
- Environmental Science and Engineering 9