| Category | Number of Projects |
|---|
| Environmental Engineering and Science in Civil Engineering | 261 |
| Power and Energy Systems | 197 |
| Reliable and High-Performance Computing | 189 |
| Transportation Facilities and Systems | 145 |
| Control Systems | 144 |
| Bioacoustics | 142 |
| Experimental Condensed Matter Physics | 133 |
| Magnetic Resonance | 127 |
| High Frequency Devices | 126 |
| Structural Engineering and Structural Dynamics | 119 |
| Theoretical Condensed Matter Physics | 117 |
| Bioengineering | 115 |
| Geotechnical Engineering | 115 |
| Decision and Control | 107 |
| Biochemical and Biomedical Engineering | 106 |
| Mechanics of Fluids | 105 |
| Nano-, Micro-, and Meso-Technology | 103 |
| Materials and Structures | 101 |
| Heat Transfer | 94 |
| Semiconductors | 94 |
| Fluid Dynamics | 91 |
| Soft Materials | 91 |
| Environmental Hydrology and Hydraulic Engineering | 91 |
| Materials Behavior | 91 |
| Behavior of Engineering Materials | 88 |
| Manufacturing Systems | 86 |
| Bioenvironmental Engineering | 81 |
| Energy Systems and Thermodynamics | 77 |
| Electromagnetics | 75 |
| Circuits | 73 |
| Construction Management | 72 |
| Computer Architecture and Compilers | 72 |
| Computational Mechanics | 72 |
| Earthquake Engineering | 68 |
| Nanoscience and Technology | 68 |
| Aerodynamics | 67 |
| Materials Processing | 63 |
| Materials | 63 |
| Structural Mechanics | 62 |
| Nuclear Materials, Materials Science and Performance, Radiation Effects, and Waste Management | 61 |
| Combustion and Propulsion | 61 |
| Artificial Intelligence: Machine Learning, Vision, and Robotics | 61 |
| Biomaterials | 60 |
| Digital Signal and Imaging Processing | 59 |
| Astrodynamics | 58 |
| Systems and Control | 58 |
| Automotive Systems | 57 |
| Optical Physics and Engineering | 56 |
| Programming Languages, Formal Systems, and Software Engineering | 55 |
| Thin Films and Charged Particles | 55 |
| Thin-Film Electronics | 54 |
| Construction Materials | 54 |
| Parallel Processing | 49 |
| Biological and Biomolecular Physics | 48 |
| Advanced Automation | 48 |
| Optical Imaging | 48 |
| Processing | 46 |
| Electrical Ceramics | 44 |
| Signal and Image Processing | 44 |
| Operations Research | 42 |
| Networking | 41 |
| Nuclear Fusion | 41 |
| Optoelectronics | 40 |
| Thermal Hydraulics and Reactor Safety | 40 |
| Applied Plasma Physics | 39 |
| Scientific Computing | 37 |
| Theoretical Astrophysics | 37 |
| Nondestructive Evaluation and Testing | 36 |
| Design Methodology and Tribology | 35 |
| Mechanical Behavior of Solids | 35 |
| Food and Bioprocess Engineering | 34 |
| Semiconductor Physics | 34 |
| Advanced Processing and Circuits | 34 |
| Engineering Mechanics | 34 |
| Communications | 33 |
| Structural Dynamics | 33 |
| Artificial Intelligence | 32 |
| Design Theory and Methodology | 31 |
| Databases and Information Systems | 30 |
| Dynamical Systems | 30 |
| Electromagnetic Communication and Electronics Packaging | 30 |
| Materials Chemistry | 30 |
| Optical and Discharge Physics | 29 |
| Dynamic Systems | 29 |
| Nuclear Power, Operations, and Control | 29 |
| Site-Specific Agriculture | 29 |
| Mechanics of Solids | 28 |
| Semiconductor Lasers | 28 |
| Genetic and Evolutionary Computation | 28 |
| Agricultural Safety | 27 |
| Graphics and Visualization | 26 |
| Fluid Flow, Heat, and Mass Transfer Fundamentals | 26 |
| Physics Research and Education | 26 |
| Computational Fluid Dynamics | 26 |
| Ceramic Synthesis and Processing | 25 |
| Polymers | 24 |
| Theoretical High-Energy Physics | 24 |
| Remote Sensing | 24 |
| Structural Mechanics and Dynamics | 24 |
| Microelectromechanical Systems (MEMS) | 23 |
| Water Purification | 23 |
| Transportation Systems | 23 |
| Phase Transformation | 23 |
| Combustion | 22 |
| Experimental Particle Physics | 22 |
| Structural Engineering and Design | 21 |
| Optimization and Process Systems Engineering | 21 |
| Biomechanics and Rehabilitation Engineering | 20 |
| Lasers | 20 |
| Integrated Mechanical and Structural Design | 20 |
| Health Physics, Radiological, and Medical Applications | 19 |
| Operations Management and Research | 19 |
| Operating Systems and Security | 19 |
| Soil and Water Resources | 19 |
| Structural Engineering and Structural Mechanics | 19 |
| Structural Ceramics | 19 |
| Railroad Engineering | 19 |
| Applied Mathematics | 18 |
| Communications Networks | 18 |
| Surface Studies | 18 |
| Water Quality | 17 |
| Computer Simulation of Materials | 17 |
| Atomic, Molecular, and Optical Physics | 16 |
| Propulsion and Combustion | 16 |
| Reactor Physics and Reactor Kinetics | 16 |
| Parallel Computing | 16 |
| Tunneling Microscopy | 15 |
| Environmental Engineering | 15 |
| Propulsion | 15 |
| Dynamics, Vibrations, and Waves | 15 |
| Numerical and Scientific Computing | 14 |
| Arms Control, Disarmament, and International Security | 14 |
| Computer Architecture and Systems | 13 |
| Distributed Systems | 13 |
| Space Propulsion and Power Systems | 13 |
| Biosensors | 12 |
| Experimental Nuclear Physics | 12 |
| Compilers | 12 |
| Aeronomy | 12 |
| Composites | 11 |
| Applied Computation Theory | 11 |
| Production Management | 11 |
| Phase Transformation and Microcharacterization | 11 |
| Real-Time and Embedded Systems | 11 |
| Human Factors and Ergonomics | 11 |
| Off-Road Equipment Engineering | 11 |
| Alternative Fuels | 11 |
| HumanComputer Interfaces | 10 |
| Engineering Statistics and Quality Control | 10 |
| Interfaces | 10 |
| Operating Systems | 9 |
| Grain Qualities and Properties | 9 |
| Microchemical, Microfluidic, and Nanochemical Systems | 9 |
| Low-Energy Nuclear Reactions | 9 |
| Microelectronics Packaging Materials and Processes | 9 |
| Theoretical Particle Physics | 8 |
| Tribology | 8 |
| Flight Vehicle Synthesis | 8 |
| Robotics | 8 |
| Multiscale Systems | 8 |
| Computing | 8 |
| Solid State Devices | 8 |
| Microstructure Characterization | 8 |
| Electromagnetics Communication and Electronics Packaging | 7 |
| Computational Science and Engineering | 7 |
| General Engineering: Bioengineering | 6 |
| Complex Fluids | 6 |
| System Safety, Reliability, and Design | 6 |
| Biomedical Magnetic Resonance | 6 |
| Other Physics Research | 6 |
| Photonic Materials | 6 |
| Theoretical Nuclear Physics | 6 |
| Aerospace Systems Design | 6 |
| Engineering Mechanics and Materials | 6 |
| Software Engineering | 6 |
| Agricultural Infotronic Systems | 6 |
| Off-Road Machinery | 5 |
| Aerospace Vehicle Flight Simulation | 5 |
| Aeroelasticity | 5 |
| Cellular Bioengineering | 5 |
| Computational Biology | 5 |
| Computer Simulation and Modeling of Materials | 5 |
| Metals Processing | 4 |
| Bioinstrumentation | 4 |
| Environmental Design and Manufacturing | 4 |
| Thermal Behavior of Materials | 4 |
| Supercomputing Research and Development | 4 |
| Computer Engineering | 4 |
| Computational Neuroscience | 4 |
| Surfaces and Interfaces | 4 |
| Ceramic Corrosion | 4 |
| Complex Systems | 4 |
| Biomolecular and Biological Physics | 4 |
| Computer Graphics | 4 |
| Chemical Reaction | 4 |
| Engineering Education | 4 |
| Product Development | 4 |
| Bioelectric Phenomena | 3 |
| Algorithms and Theory | 3 |
| Theoretical Computing | 3 |
| Observational Cosmology | 3 |
| Surface Modifications | 3 |
| Nonlinear Controls | 3 |
| Nanoelectromechanical Systems | 3 |
| Geotech/Information Technology | 3 |
| Human Factors | 3 |
| Real-Time Systems | 3 |
| Biomolecular Engineering | 3 |
| Educational Research | 2 |
| Ceramic and Glassy Solids | 2 |
| Ceramic Coatings | 2 |
| Human-Computer Interaction | 2 |
| Surface Studies, Coatings, and Laser Processing | 2 |
| Air Purification | 2 |
