Search results for "Unitary state"
showing 3 items of 133 documents
Unitary transformations depending on a small parameter
2011
We formulate a unitary perturbation theory for quantum mechanics inspired by the LieDeprit formulation of canonical transformations. The original Hamiltonian is converted into a solvable one by a transformation obtained through a Magnus expansion. This ensures unitarity at every order in a small parameter. A comparison with the standard perturbation theory is provided. We work out the scheme up to order ten with some simple examples.
Construction engineering and natural philosophy: the work by Gabriel Lamé
1995
We find Lame again, an other pupill of the “Ecole polytechnique” who considers again the analogy between the catenary and the thin vault stable under its own weight He improve the famous work of Coulomb who applies the theory of maximis and minimis to Architecture. Le scientific biography that follows shows a scientist who has been interrested in cristallography, elastic mediums, optics and heat, electricity and was convinced of the existence of a unitary theory in which an elastic ether would play a central role.
Public Opinion, National Integration and National Identity in Spain: The Case of the Barcelona Olympic Games
1997
. This article analyses the impact of the Barcelona 1992 Olympic Games on national integration and national identity in Spain with respect to the conflict of interests that developed around the Games between the centre and Catalonia. We argue that polarisation along nationalist lines was limited in large part because national identity in Spain today is not predominantly a unitary and exclusive entity. Dual identity, loyalty to both Spain, on the one hand, and to one's region, or nation as in the case of Catalonia, on the other, and inclusive nationalism that does not aim at complete national independence, increasingly have tended to predominate in the last decade and a half. The Olympics, t…