6 Wind energy p. 341
6.1 The cinetic energy of wind 341
6.2 Types of wind rotors and their power 346
6.3 Wind rotors with horizontal axes 349
6.4 Modern turbines with horizontal axis 353
6.5 Other wind turbines 354
6.6 Operation and control 360
7 Photovoltaic energy p. 365
7.1 Physical bases, photoelectric effect 365
7.2 Photovoltaic effect, photocurrent 369
7.3 The solar cell, over-all efficiency 376
7.4 The sun as energy source 385
7.5 The photovoltaic system 397
8 Fuel cell p. 405
8.1 Structure and types 405
8.2 Principle and model 407
8.3 Fuel cells for stationary applications 410
9 Nuclear fusion p. 413
9.1 Bases of fusion process 413
9.2 The fusion reactor 415
9.3 State of the art and perspectives of nuclear fusion 425