We extend the transformational model of social activity proposed in recent realist social theory by importing into it a theory of technological objects and technological change. The paper begins with an account of the transformational model, focusing particularly on the relationship between...

The sun tracking system of a solar dish based on computer image processing of a bar shadow is investigated. This is done by using a camera to obtain the optimized picture of a bar shadow on a screen by solar dish displacements. This system is independent respect to geographical location of the...