86 citations · 497 across the 75 of their papers we have counts for
7 papers · 1 filter
Non-commutative time-frequency tomography
V. I. Man'ko, R. Vilela Mendes
The characterization of non-stationary signals requires joint time and frequency information. However, time (t) and frequency (omega) being non-commuting variables there cannot be…
On the computation of quantum characteristic exponents
R. Vilela Mendes, Ricardo Coutinho
A quantum characteristic exponent may be defined, with the same operational meaning as the classical Lyapunov exponent when the latter is expressed as a functional of densities. Ex…
Saddle scars: Existence and applications
R. Vilela Mendes
A quantum scar is a wave function which displays an high intensity in the region of a classical unstable periodic orbit. Saddle scars are states related to the unstable harmonic mo…
Collision states and scar effects in charged three-body problems
R. Vilela Mendes
Semiclassical methods form a bridge between classical systems and their quantum counterparts. An interesting phenomenon discovered in this connection is the scar effect, whereby en…
Active control of ionized boundary layers
R. Vilela Mendes
The challenging problems, in the field of control of chaos or of transition to chaos, lie in the domain of infinite-dimensional systems. Access to all variables being impossible in…
Boundary-layer control by electric fields: A feasibility study
R. Vilela Mendes, J. A. Dente
A problem of great concern in aviation and submarine propulsion is the control of the boundary layer and, in particular, the methods to extend the laminar region as a means to decr…