The Betz theory expresses that no horizontal axis wind turbine can extract more than 16/27 (59.3%) of the kinetic energy of the wind. The factor 16/27 (0.593) is known as the Betz limit. Horizontal Axis wind turbine designers try to improve the power performance to reach the Betz limit. Modern operational wind turbines achieve at peak 75% to 80% of the Betz limit. In 1919, Albert Betz used an a...

I deal in this review with behavioral and developmental aspects of arm movements aimed at targets in immediate extrapersonal space. In addition, neural mechanisms that may subserve this function are discussed on the basis of neuronal recording and brain lesion studies. However, this is not a comprehensive review of each subject; thus, no exhaustive references are given, nor is a detailed tracin...