TJ Mechanical engineering and machinery 43 TA Engineering (General). Civil engineering (General) 32 TK Electrical engineering. Electronics Nuclear engineering 12 Aerodynamics 6 Aeronautics. Aeronautical engineering 5 Forecasting 4 Rocks 4 Tunnels 4 Wind tunnels 4 Blended wing body 3 Efficiency 3 Rock mechanics 3 A: semiconductors 2 Aerospace engineering 2 Air sensor 2 Boring machines (machine tools) 2 Construction equipment 2 Degrees of freedom (mechanics) 2 Earthquakes 2 Extraction 2 Hyperbolic-based model 2 I-V characteristics 2 Lows-temperatures 2 Mechanics applied to machinery. Dynamics 2 Mechanics of flight: Aerodynamics 2 Nonlinear time history analysis 2 Numerical methods 2 Performance 2 Railroads 2 Rock-mass 2