Mines ParisTech

About: Mines ParisTech is a education organization based out in Paris, France. It is known for research contribution in the topics: Finite element method & Microstructure. The organization has 6564 authors who have published 11676 publications receiving 359898 citations. The organization is also known as: École nationale supérieure des mines de Paris & École des mines de Paris.

The role of propeller aerodynamics in the model of a quadrotor UAV

Abstract: We study models of a quadrotor UAV. These models include various aerodynamic effects of the propellers and their interactions with the motion of the rigid body of the UAV. Two main assumptions are formulated: the twisting of the propellers is such that the local angle of attack is constant along the blades in stationary flight, and, secondly, that the local induced velocity is also constant along the blades. Under these assumptions (which correspond to an optimal hovering rotor), we conclude that the flexibility of the propellers plays an important role in the dynamics of the UAV (including the effects of the vertical location of the center of gravity), and that it is interesting to account for it when designing a closed loop controller.

Convergence or path dependency in policies to foster the creation of university spin-off firms? A comparison of France and the United Kingdom

Abstract: This paper examines attempts by French and UK governments to fill the gap between the US and Europe with respect to the creation of academic spin-offs. Analysis of the contrasting cases of the UK and France, shows that there is no convergence of national policies to foster the creation of firms by academics. Rather, the two countries demonstrate different rationales and approaches to policy in this area. In UK, the rationale for spin-off policy is mainly to develop a third stream of financing. Spin-offs are a part of a policy to commercialize technology and knowledge created by universities. Policy is at the university level, leading to the creation of diverse structures. Public schemes bring public money directly to universities. In France, the rationale for policy towards the creation of new ventures by academics is the development of high technology new ventures as part of a technological entrepreneurship policy. The notion of a third stream of financing for universities is an argument that is never advanced. The UK has placed the universities at the heart of policies aimed at the creation of spin-offs, this is not the case in France.