In skill-biased (de-skilling) technological revolutions learning investments required by new machines are greater (smaller) than those required by preexisting machines. Skill-biased (de-skilling) revolutions trigger reallocations of capital from slow(fast-) to fast(slow-) learning workers, thereby reducing the relative and absolute wages of the former. The model of skill-biased (de-skilling) re...

revolutionary movements which began in tunis in 2010 immediately impressed all arab countries. these movements have led to many essential changes in the middle east. so far, four presidents have been ousted from power. revolutionary forces in the arab world to achieve their goals used media. so the media played a large role in the revolutionary changes in the arab countries. given the media&apo...

Military Revolutions Murray and Knox equated military revolutions to ‘‘earthquakes.’’ These earthquakes forced a fundamental change in society and a state, and the state consequently altered the way it created and projected military power. Murray and Knox recognize five major military revolutions that have had that impact on Western history: the 17th century creation of the modern state and mod...

Knowledge domain visualization is a visual exploratory approach to the study of the development of a knowledge domain. In this study, we focus on the practical issues concerning modeling and visualizing scientific revolutions. We study the growth patterns of specialties derived from citation and cocitation data on string theory in physics. Special attention is given to the two superstring revol...