Global ETD Search
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 15 of 15 for “"periodic system"”.
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Flexible Learning in the Periodic System With Multiple Representations: The Design of a Hypertext for Learning Complex Concepts in Chemistry
This dissertation argues that the design of technological artifacts such as educational software is a complex process involving a continuous dialogue between theory and practice; between constraints and tradeoffs; between designers and their materials; between designers and the users/learners. It …
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Control of Periodic Systems Governed by Partial Differential Equations Using Averaging
… a mathematical tool for dynamic analysis of time-periodic and space-periodic dynamical systems, including those governed by partial differential equations. The control design procedure presented in this work uses averaging techniques, the well-developed linear control strategies, and finite …
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Analytic representation of quantum systems
Finite quantum systems with d-dimension Hilbert space, where position x and momentum p take values in Zd(the integers modulo d) are studied. An analytic representation of finite quantum systems, using Theta function is considered. The analytic function has exactly d zeros. The d paths of these …
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Application of the Filtered-X LMS Algorithm for Disturbance Rejection in Time-Periodic Systems
… methods have been established for time-invariant systems. However, the development of these techniques has not focused on application to time-periodic systems in particular until recently. The filtered-X LMS algorithm is regarded as the best disturbance rejection technique for aperiodic systems by …
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A Study of Quantum Interference and Entanglement with Negative Optics
… concept with measurements on a one-dimensionally periodic system (grating) where the relation α = cos-1[Z(β, κ)] holds; Z is shown to be a function of the diffractive index parameter (κ) and the two angles α and β. Excellent agreement is found between experimental data and theory. Future …
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Flapping Wing Flight Dynamic Modeling
… reconnaissance and surveillance vehicles. These systems involve highly complicated physics surrounding the flapping wing motion and unusual characteristics due to a hover requirement not normally associated with conventional aircraft. To that end this study focuses on examining the various models …
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Electromechanical Coupling of Distributed Piezoelectric Transducers for Passive Damping of Structural Vibrations: Comparison of Network Configurations
… Both refined and homogenized models of those periodic systems are derived by an energetic approach based on the principle of virtual powers. Weak and strong formulation of the dynamical problem are presented having in mind future studies involving the determination of numerical solutions. In …
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The Equilibria, Stability and Nonlinear Dynamics of Magnetically Sheared Atmospheres With Applications to the Solar Environment
… magnetic layer while the other is composed of a periodic system of magnetic arcades. Two aspects of these magnetostatic atmospheres are addresses. First, linear stability analyses demonstrates that certain members of both families of equilibria are stable. Next, it is shown that planar …
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Values in Action: Simplicity, Completeness, and Carefulness in the Development of the Systematisations of Chemical Elements
… different values when developing their systematisations of the chemical elements in 1863-1875. While no chemist emphasised just one value in the course of establishing of their systematisations, I argue that Newlands elevated simplicity (“simple relation”), Mendeleev completeness …
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Density relaxation of granular matter through Monte Carlo and granular dynamics simulations
… by the application of discrete taps to a periodic system of monodisperse spheres. Both stochastic ( Monte Carlo) and deterministic (granular dynamics) simulations are employed in this work. The granular microstructure of the system particles was analyzed via radial distribution function, …
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Avalanching on dunes and its effects: Size statistics, stratification, & seismic surveys
… that several authors have predicted for such a system with the hysteretic behaviour that others have observed, the system exhibits quasi-periodic, system-spanning avalanches in one regime, while in the other avalanches pass at irregular intervals and have a power-law size distribution. Secondly, …
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Scale selection in hydromagnetic dynamos
… incompressible MHD equations in elongated triply-periodic domains. To commence the investigation, a linear stability analysis of the coarsening instability in a one-dimensional periodic system is performed to study the stability threshold in the mean-field limit that assumes large scale separation …
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Maßgeschneidertes und Analytik-Ersatz : über die quantenchemischen Untersuchungen einiger ternärer intermetallischer Verbindungen
… structured compounds. An ad hoc constructed periodic system of Heusler phases made it possible to visualise periodicities of magnetic moments of all these compounds. The most promising magnetic properties were looked at in detail for the compounds Rh2YZ (Y~=~Fe, Mn, Cr; Z~=~Al, In, Bi). With …
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Some nonlinear problems in plankton ecology
… environment at a similar frequency. In nonlinear systems, however, different scales of variability interact and forcing at one frequency can produce variability at a different frequency. The general theme of this dissertation regards the interplay of scales in nonlinear ecological systems, with an …
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Phases and non-equilibrium dynamics of ultracold bosons in an optical quasicrystal
… optical quasicrystal. Quasicrystalline and quasiperiodic systems, thanks to their long-range order and lack of periodicity, exhibit a wealth of interesting properties such as a dense and self-similar momentum space, and a localization transition to Anderson insulator or Bose glass states (in …