Engineering 25 Problems, exercises, etc 25 Purification 20 Water 20 Design and construction 12 Mechanical engineering 12 Signal processing 12 Máis ... Strains and stresses 11 Dynamics 10 Mathematics 8 Automatic control 7 Engineering design 7 Power transmission 6 Water quality 6 Electric filters 5 Filtration 5 Finite element method 5 Natural frequency 5 Statistical methods 5 Stress concentration 5 System analysis 5 Voltage drop 5 Discrete-time systems 4 Machine design 4 Structural frames 4 Testing 4 Beam Deflections 3 Carbon, Activated 3 Coagulation 3 Concrete construction 3 menos ...