Buscar
Mostrando ítems 21-30 de 1371
Power flow optimization for grid connected inverter using evolutionary algorithm and additional control loop
(2011-12-28)
In this work it is proposed to validate an evolutionary tuning algorithm in plants composed by a grid connected inverter. The optimization aims the tuning of the slopes of P-Ω and Q-V curves so that the system is stable, ...
Integer and fractional microwave induced resistance oscillations in a 2D system with moderate mobility
(ELSEVIER SCIENCE BV, 2010)
We report on integer and fractional microwave-induced resistance oscillations in a 2D electron system with high density and moderate mobility, and present results of measurements at high microwave intensity and temperature. ...
Multiperiodic magnetic structures in Hubbard superlattices
(2002-08-01)
We consider fermions in one-dimensional superlattices (SL's), modeled by site-dependent Hubbard-U couplings arranged in a repeated pattern of repulsive (i.e., U>0) and free (U=0) sites. Density matrix renormalization group ...
Multiperiodic magnetic structures in Hubbard superlattices
(2002-08-01)
We consider fermions in one-dimensional superlattices (SL's), modeled by site-dependent Hubbard-U couplings arranged in a repeated pattern of repulsive (i.e., U>0) and free (U=0) sites. Density matrix renormalization group ...
Magnetoresistance oscillations in multilayer systems: Triple quantum wells
(AMER PHYSICAL SOC, 2009)
Magnetoresistance of two-dimensional electron systems with several occupied subbands oscillates owing to periodic modulation of the probability of intersubband transitions by the quantizing magnetic field. In addition to ...
Effects of solar neutrinos scale on atmospheric neutrino flux
(Sociedade Brasileira de Física, 2007)
Contadores eletrônicos no laboratório didático. Parte I. Montagem e aplicações
(2008-11-06)
We show how to set up a 4-digit electronic counter, using inexpensive and easy-to-find components. We show, also, how a counter in conjunction with a crystal oscillator of 1 MHz can be used to measure time intervals ...
Shubnikov de Haas oscillations in double wells with opposite signs of the electronic g-factor
(ELSEVIER SCIENCE BV, 2008)
We report on the measurements of the Shubnikov de Haas oscillations (SdH) in symmetrically doped AlxGa1-xAs double wells with different Al compositions in wells, which lead to the opposite signs of the electronic g-factor ...