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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

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Showing 1 to 20 of 92 for “"Quasi-Periodic"”.

  1. On quasi-periodic Baroclinic variability in the extratropical circulation

    Crow, Brian, author, Thompson, David W. J., advisor, Barnes, Elizabeth A., committee member, Aster, Richard C., committee memberColorado State University. Libraries2016

    … extratropical wave activity is characterized by quasi-periodic behavior on timescales of 20-30 days, particularly in the Southern Hemisphere. This phenomenon has been termed the Baroclinic Annular Mode (BAM), and is responsible for the modulation of eddy heat fluxes, eddy kinetic energy, and …

    colostate Repository record

  2. Never breaking quasi-periodic solutions of weakly nonlinear gas dynamics

    Shefter, Michael G., 1970-Massachusetts Institute of Technology1997

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1997.

    mit Repository record

  3. Phase Transitions in driven 1D and Quasi-Periodic 2D Optical Lattices

    Bhave, ShauryaUniversity of Cambridge2022

    … a two dimensional Bose glass state in an optical quasicrystal. Quasicrystalline patterns posses long-range order but lack periodicity. This places them in the spectrum of materials between clean, ordered crystals and disordered, amorphous solids. They share properties of both disordered structures …

    cambridge Repository record

  4. Wave transport in parity-time symmetric, time-varying, and quasi-periodic systems

    Xiao, Zhicheng, 1987-The University of Texas at Austin2021

    … symmetric systems, time-varying systems and quasi-periodic systems. These newly developed material platforms have been enabling many exotic wave-matter interaction phenomena unavailable in nature. In this context, I investigated a series of wave transport and scattering phenomena in …

    texas Repository record

  5. Mapping of the Quasi-periodic Oscillations at the Flank Magnetopause into the Ionosphere

    Dougal, Emily R.

    … ionospheric location, area, and travel time of quasi-periodic oscillations originating from the magnetospheric flanks. This was accomplished by utilizing global and local MHD models and Tsyganenko semi-empirical magnetic field model on multiple published and four new cases believed to be caused …

    embry-riddle Repository record

  6. Quasi-periodic oscillations in observed and simulated temperatures, and implications for the future

    Lindner, DanielaUniversity of Illinois at Urbana-Champaign2013

    … (SSA) approach that enables the study of non-periodic – so-called “quasi-periodic” oscillations (QPOs). SSA can resolve QPOs that have periods up to half the length of the record, something which is impossible using traditional Fourier analysis. All four long-term atmosphere-ocean near-surface …

    uiuc Repository record

  7. An investigation of fixed separation in quasi-periodic and aperiodic, unsteady, two-dimensional flows

    Helu, Moneer MohammadMassachusetts Institute of Technology2007

    … flow to drive low Reynolds number quasi-periodic and aperiodic flows. Flow separation was observed using flow visualization techniques that employed fluorescent dye. These experimental investigations show the existence of fixed separation in both quasi-periodic and aperiodic flows. …

    mit Repository record

  8. Station-keeping and orbital transfers in the vicinity of the Moon exploiting quasi-periodic orbit dynamics

    Duering, MarcelUniversity of Strathclyde2020

    … greatly varying parameters.;The utilisation of quasi-periodic orbits increase the flexibility in planning future missions, reduces the complexity of long-term space missions by enabling larger windows for manoeuvre execution for orbital transfers. Furthermore, properties of operational orbits …

    strathclyde Repository record

  9. Low-Thrust Optimal Escape Trajectories from Lagrangian Points and Quasi-Periodic Orbits in a High-Fidelity Model

    MASCOLO, LUIGIPolitecnico di Torino2023

    L'abstract è presente nell'allegato / the abstract is in the attachment

    poli-torino Repository record

  10. Integrated Framework for Design Exploration and Analysis of Periodic, Non-Periodic, and Quasi-Periodic Cellular Structures Based Components

    Wang, JunState University of New York at Buffalo2019

    Ph.D.

    buffalo Repository record

  11. High frequency quasi-periodic oscillations in the X-ray radiation of the black hole binary GRS 1915+105

    Gazak, Jonathan ZacharyMassachusetts Institute of Technology2006

    … cycle, which is selected for its high frequency quasi-periodic oscillations (HFQPOs) and recurring double-peak flare in the light curve. We investigate the primary properties of the 82 p-type observations collected by RXTE. The range in flare recurrence time () is 33.73 s < T < 122.49 s, with <> …

    mit Repository record

  12. Spectral changes during the 0.1-4 Hz quasi-periodic oscillations in the black hole X-ray binary XTE J1550-564

    Cho, Steven N. (Steven Nicholas)Massachusetts Institute of Technology2005

    … thesis, we describe the analysis of 0.1-4 Hz quasi-periodic oscillations (QPOs) of the black hole X-ray binary XTE J1550-564 using data obtained with the Rossi X-ray Timing Explorer (RXTE) satellite. Data from 13 consecutive observations spanning eight days were included in this analysis. By …

    mit Repository record

  13. LONG TIME BEHAVIOR OF LINEAR AND NONLINEAR WAVES:LARGE LARGE AMPLITUDE TRAVELING QUASI-PERIODIC SOLUTIONS IN FLUID MECHANICS AND DYNAMICS OF LINEAR WAVE EQUATIONS

    TERRACINA, SHULAMITUniversità degli Studi di Milano2025

    In this thesis we study quasilinear PDEs on tori and we prove existence results of quasi-periodic large amplitude solutions for fluid-dynamic models in more than one space-dimension and a stability result for the linear Klein-Gordon Equation with a small quasi-periodic perturbation. In the first …

    milano Repository record

  14. Nonlinear thermoacoustic oscillations of a ducted laminar premixed flame

    Kashinath, KarthikUniversity of Cambridge2013

    … a nonlinear system. Nonlinear systems can have quasi-periodic and chaotic oscillations. This thesis examines the different types of oscillation in a numerical model of a ducted premixed flame, the bifurcations that lead to these oscillations and the influence of external forcing on these …

    cambridge Repository record

  15. Exploring the super-orbital periodic behaviour of X-Ray binaries

    Kotze, Marissa MimiDepartment of Astronomy2012

    Quasi-periodic super-orbital modulations are an established feature of several luminous X-ray binaries. The mechanisms that have been proposed to be responsible for such modulations include irradiation-driven warping/tilting and tidally-induced precession of the accretion disc, jet precession and …

    cape-town Repository record

  16. Dynamic Imaging by Motion Estimation

    Jiang, HongUniversity of Illinois at Urbana-Champaign2015

    … resolution from a time-varying object with periodic or quasi-periodic motion. Specifically, it has been shown that the proposed method can handle complex signal variations with localized motion, nonrigid-body motion, and motion in arbitrary directions. An important application of the …

    uiuc Repository record

  17. Alfven-Rossby Waves in Rotating Magnetized Stars

    Chen, YunUniversity of Illinois at Urbana-Champaign2015

    … and explained the existence of very long-period quasi-periodic oscillations.

    uiuc Repository record

  18. VHF Radar Studies of the Mid-Latitude E-Region Ionosphere From Camp Santiago, Puerto Rico

    Urbina, Julio VictorUniversity of Illinois at Urbana-Champaign2015

    Regarding quasi-periodic layers detected above 100 km in Puerto Rico, our observations show that descending signatures can be explained as the consequence of descending plasma layers that are being dumped at lower E-region altitudes due to the action of gravity waves. Overall, a striking result is …

    uiuc Repository record

  19. A global and tropical quasi-decadal oscillation of the atmosphere and Ocean

    Agard, John VincentMassachusetts Institute of Technology2011

    An oscillatory, quasi-periodic signal with a period of around 10 years was found in radiosonde- and satellite-measured datasets of lower stratospheric temperature. Power spectrum analysis and Fourier decomposition were used to characterize the temporal and vertical manifestations of the signal, …

    mit Repository record

  20. Rapid oscillations in cataclysmic variable stars

    Pretorius, Magaretha LDepartment of Astronomy2004

    Rapid quasi-coherent oscillations were detected in the optical light curves of 24 cataclysmic variable stars (CVS). In 12 of these systems (TU Men, WW Cet, HX Peg, BP CrA, BR Lup, HP Nor, AG Hya, TW Vir, PU CMa, V426 Ooph, V1193 Ori, and CR Boo) for the first time. The results contribute to the …

    cape-town Repository record

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