To balance the performance and complexity for frequency estimation of sinusoid wave using DFT-based methods, an efficient algorithm based on improved Quinn is proposed. The amplitude phase information are used to interpolate which ensures accuracy shift direction. A method piecewise performed, it has characteristics higher precision lower computational costs. Simulation results show that judgme...

Landscapes are now being altered at unprecedented rates (Forman and Alexander 1998), resulting in the loss and fragmentation of critical habitats (Gardner et al. 1993), declines in species diversity (Quinn and Harrison 1988, Gu et al. 2002), shifts in disturbance regimes (He et al. 2002, Timoney 2003), and threats to the sustainability of many ecosystems (Grime 1998, Simberloff 1999). Because t...

Glenn Haugeberg, Michael J Green, Philip G Conaghan, Mark Quinn, Richard Wakefield, Susanna M Proudman, Sheena Stewart, Elizabeth Hensor, Paul Emery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Global-symmetry violating higher-dimension operators, expected to be induced by Planck-scale physics, in general drastically alter the properties of the axion field associated with the Peccei-Quinn solution to the strong-CP problem, and render this solution unnatural. The particle physics and cosmology associated with other global symmetries can also be significantly changed. ⋆ Research support...

RÉSUMÉ. Sous les hypothèses requises, on étudie une version discontinue des lois de contrôle dites “amortissantes” ou encore “de Jurdjevic-Quinn”. On présente un résultat de stabilisation pratique lorsque la borne sur les contrôles est suffisamment petite. La motivation est d’estimer sa croissance du temps qu’il faut pour atteindre un voisinage donné de la cible quand la susdites borne tend ver...