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Valley degeneracy in (110) Si quantum wells (QWs) is studied. Band structures are computed using the nearest neighbor sp d s tight-binding model and strain relaxation is performed by a valence force field. Two degeneracy breaking mechanisms are identified: different confinement effective mass and valley-valley interaction. Strain and electric field are both found to enhance valley splitting. Surface...
This paper addresses actuator outages, or any actuator fault under the reconfiguration strategy. Based on the lattice structure of the set of system configurations, a frame that guarantees stability by mixing both the passive and active fault tolerance strategies is proposed. The proposed PACT designs a bank of controllers, with minimal number of control laws, and minimal instability during switching.
A new multichannel lattice filter is used to identify a multichannel ARMA model for a large flexible truss from experimental data. The numerical results demonstrate the fast convergence of the adaptive lattice filter, and illustrate the importance of using multiple measurement channels simultaneously in identifying flexible structures with repeated or nearly repeated frequencies.
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