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 20 of 95 for “"aperiodic"”.
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Aperiodic Order and Singular Spectra
This work focuses on several models of aperiodic order and their applications in different areas of mathematics and mathematical physics. After a short introduction to the theory of dynamicals systems, we present random substitutions as a stochastic variant of substitutions which create symbolic …
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Studies on Aperiodic and Quasiperiodic Crystals
… extended and applied to one- and two-component aperiodic and quasiperiodic crystals. First the free energy as a function of density is calculated using an average environment approximation. Then this approximation is lifted and all particles are allowed to move and search out their local free …
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Fractal and Statistical Phenomena in Aperiodic Order
… diffraction patterns of the recently discovered aperiodic monotile tilings, whose windows possess fractal boundaries and the usual techniques fail in their cases. To do so, we provide an explicit formula for the diffraction exact intensities of deformed model sets using the undeformed case.
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Aperiodic Job Handling in Cache-Based Real-Time Systems
… tasks, event-driven behavior is modeled using aperiodic jobs with soft or no deadlines. To provide good Quality-of- Service for aperiodic jobs in the presence of sporadic tasks, aperiodic servers were introduced. Aperiodic servers act as a sporadic task and reserve a quota periodically to serve …
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Entrainment of Bacterial Synthetic Oscillators using Proteolytic Queueing and Aperiodic Signaling
… for degradation, and entrainment by a noisy (aperiodic) stimulus. Both of these modes of entrainment can be shown to strongly synchronize ensembles of synthetic gene oscillators, and thus, these modes of entrainment may be important to understand the appearance of synchrony in natural systems. …
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Utilizing slack time for aperiodic and sporadic requests scheduling in real-time systems
… system typically has a mixture of periodic and aperiodic workload. Requests in each periodic task have regular arrival times and hard deadlines. Aperiodic requests, on the other hand, have random arrival times and may have hard or soft deadlines. We called these aperiodic requests with hard …
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An investigation of fixed separation in quasi-periodic and aperiodic, unsteady, two-dimensional flows
… 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. The experimental …
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Self-Consistent Phonon Theory of Aperiodic Solids and Density Functional Theories of Freezing and Vitrification
We extend Fixman's self-consistent phonon theory of the thermodynamic properties and fluctuations of the hard sphere crystal to an amorphous lattice. In doing so, we develop a theory of lattice vibrations in amorphous materials via a perturbation theory around the Einstein oscillator approximation. …
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Electrophysiological systems underlying human domain-general cognition and selective attention
… systems—including oscillatory, aperiodic, and evoked responses—to these processes, using a combination of cutting-edge techniques such as MEG/EEG, MEG-fMRI fusion, and concurrent TMS-EEG. The research aims to examine how these electrophysiological responses encode task demands …
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Optimization of Aperiodically Spaced Antenna Arrays for Wideband Applications
… ability has led to research in the area of aperiodically spaced antenna arrays. Aperiodic arrays use variable spacing between antenna elements and generally require fewer elements than periodically spaced arrays to achieve similar far field pattern performance. This reduction in elements …
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The aperiodically dampened loudspeaker system
The theory of the aperiodically damped loudspeaker system is derived and investigated in both the time and frequency domains. The advantages of the aperiodic configuration over sealed box loudspeaker systems are discussed. The aperiodically damped loudspeaker system is described by the parameters …
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Unsteady Turbulence Interaction in a Tip Leakage Flow Downstream of a Simulated Axial Compressor Rotor
… at the mid span are presented. The periodic and aperiodic behavior of the tip leakage flow downstream of the cascade, produced by this vortical disturbance, is also presented using phase and time averaged 3-component turbulence and pressure fluctuation measurements. These measurements are made …
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Breaking Symmetry: A Study of Novel Phenomena in Asymmetric Nanoplasmonic Systems
… chiral, weakly disordered, deterministic aperiodic, quasiperiodic and random structures make up a new wave of asymmetric optical systems demonstrating unprecedented control of light compared to their periodic counterparts in areas such as random lasing, imaging, and bio-sensing. The …
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Characterization of wave transport in non-conservative media with random and correlated disorder
… In contrast to random structures, deterministic aperiodic structures (DAS) offer predictable and reproducible transport behaviors while exhibiting a variety of unusual transport properties not found in either ordered or random media. By manipulating structural correlations one may design and …
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Phase Transitions and the Effect of External Fields in Thermotropic Main Chain Liquid Crystal Systems
… two constitutional isomers with periodic and aperiodic chemical sequences. The experimental techniques employed were x-ray diffraction, optical microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermally stimulated discharge (TSD). It was discovered …
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Quasicrystalline optical lattices for ultracold atoms
… structure on all scales. The concept of aperiodic order has been extensively studied in mathematics and geometry, exemplified by the celebrated Penrose tiling. However, the understanding of physical quasicrystals (the vast majority of them are intermetallic compounds) is still incomplete …
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A characterization of the tail _-field for certain Markov chains
If C(v,P) is a countable state, recurrent, aperiodic and irreducible Markov Chain with stationary probabilities, the measure of any set of the tail a-field is equal to either zero or one. Although recurrent Markov chains have trivial tail a-fields this is not in general true for transient chains. …
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Stress Wave Scattering in Concrete: An Investigation Through Simple Finite Element Models
… spatial distributions include both periodic and aperiodic arrangements of inclusions.
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Algorithms and concepts for robust optimization
… programs from the Netlib benchmark set, and the aperiodic timetabling problem on the continuous side; intermodal load planning, Steiner trees, periodic timetabling, and timetable information on the discrete side. Finally, we present the software library ROPI as a framework for robust optimization …
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