Systematic Design of Adaptive Controllers for Feedback Linearizable Systems

Coordinated Science Laboratory was formerly known as Control Systems LaboratoryNational Science Foundation / ECS-87-15811 and ECS-88-05611Air Force Office of Scientific Research / AFOSR 90-001

On the Stability and Robustness of an Adaptive Nonlinear Control Scheme

Coordinated Science Laboratory was formerly known as Control Systems LaboratoryNational Science Foundation / NSF ECS-87-15811Air Force Office of Scientific Research / AFOSR 90-001

Adaptive Output-Feedback Control of a Class of Nonlinear Systems

Coordinated Science Laboratory was formerly known as Control Systems LaboratoryNational Science Foundation / NSF ECS-87-15811, ECS-88-05611, and ECS-90-12551Air Force Office of Scientific Research / AFOSR 90-001

Adaptive Output-Feedback Control of Systems with Output Nonlinearities

Coordinated Science Laboratory was formerly known as Control Systems LaboratoryNational Science Foundation / ECS-87-15811, ECS-88-05611, and ECS-90-12551Air Force Office of Scientific Research / AFOSR 90-0011Ministero della Università e della Ricerca Scientifica e Tecnologic

Global stabilization of the oscillating eccentric rotor

The oscillating eccentric rotor has been widely studied to model resonance capture phenomena occurring in dual-spin spacecraft and rotating machinery. This phenomenon arises during spin-up as a resonance condition is encountered. We consider the related problem of rotor despin. Specifically, we determine nonlinear feedback control laws that not only despin the rotor but also bring its translational motion to rest. These globally asymptotically stabilizing control laws are derived using partial feedback linearization and integrator backstepping schemes. For the case in which the oscillating eccentric rotor is excited by a translational sinusoidal forcing function, the control law is shown to attenuate the amplitude of the translational oscillation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43319/1/11071_2004_Article_BF00114798.pd

Nuclear charge radius of 26m^{26m}Al and its implication for Vud_{ud} in the quark-mixing matrix

Collinear laser spectroscopy was performed on the isomer of the aluminium isotope $^{26m}$Al. The measured isotope shift to $^{27}$Al in the 3s^{2}3p\;^{2}\!P^\circ_{3/2} \rightarrow 3s^{2}4s\;^{2}\!S_{1/2} atomic transition enabled the first experimental determination of the nuclear charge radius of $^{26m}$Al, resulting in $R_c$=\qty{3.130\pm.015}{\femto\meter}. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed $\beta$ decay of $^{26m}$Al. Its corrected $\mathcal{F}t$ value, important for the estimation of $V_{ud}$ in the CKM matrix, is thus shifted by one standard deviation to \qty{3071.4\pm1.0}{\second}.Comment: 5 pages, 2 figures, submitted to Phys. Rev. Let