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 17 of 17 for “"Linear coupling"”.
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Linear and non linear coupling effects in sequence of microresonators
… till dealing with novel configurations. The coupling between a Mach-Zehnder interferometer and such configuration of microresonators is also investigated. Since the used material platform is the silicon on insulator (SOI), an in depth study of the microresonators behaviour has demanded an …
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RF- Front-End Non-Linear coupling cancellation = Cancelación de acoplo no lineal en frontales de RF
… as multiantenna radio-frequency (RF) front-end coupling is analyzed throughout the thesis, and as a result three coupling cancellation procedures are developped and later tested in simulated coupling environments. The coupling phenomena depends on many variables, starting with the selection of …
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Cosmological magnetogenesis
… a selfconsistent framework in which the non-linear coupling between inflationary gravitational waves and a large-scale magnetic field is investigated, as means of amplifying the field to within the strength limits required to support the galactic dynamo. For the purpose of performing an …
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New aspects of black hole scalarization in alternative theories of gravity
… subject to both a tachyonic (instability-driven) coupling and a non-linear self-interaction, leading to \emph{mixed scalarization}. We show that the tachyonic coupling dominates the scalarization, while the non-linear coupling slightly extends the range of hairy solutions and influences their …
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Nonlinear Dynamics of Electrostatically and Magnetically Actuated MEMS
… for MEMS a challenging area. Besides, the non-linear coupling between the different physical domains in MEMS can give rise to interesting non-linear dynamic properties. These non-linear dynamic/chaotic properties of MEMS can be exploited for various applications like chaotic micro-fluidic …
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Reduced-order modeling of MEMS using modal basis functions
… of MEMS devices that can capture the complex non-linear coupling between multiple physical domains, yet be sufficiently fast and compact in form to insert into a system dynamics simulator. In this thesis I explore techniques of automatically constructing such models from meshed representations of …
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Hydromagnetic Oscillations and Instabilities in Astrophysical Discs
… in a variety of astrophysical contexts. Through linear theory and semi-analytical calculations, I first consider the physical properties of magnetically altered inertial waves. ‘Trapped inertial waves’ provide an attractive explanation of the fast variability observed in the emission from …
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Induced Phase Transition in Magnetoelectric BiFeO3 Crystals, Thin-layers and Ceramics
… solutions have been found to have a large linear magneto-electric coefficient, ∝p. The value of ∝p (2.5x10⁻⁹ s/m or C/m²-Oe) is ∼10x greater than that of any other material (cg., Cr₂O₃ ∼2.5x10⁻¹⁰ s/m), and many order(s) of magnitude higher than unmodified BiFeO₃ crystals. The data also …
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Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures
Linear vibration absorbers are a valuable tool used to suppress vibrations due to harmonic excitation in structural systems. Limited evaluation of the performance of nonlinear vibration absorbers for nonlinear structures exists in the current literature. The state of the art is extended in this …
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Many-body cavity QED: The Dicke model, phase transitions, and engineering of multipartite entangled atomic states
… of a generalised Dicke model with an added non-linear coupling, we discovered the presence of strong entanglement for atoms in steady state and proposed how to access such entanglement. A key concept of the thesis is the introduction of spinor atoms - i.e. atoms with integer spin - to many-body …
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Hierarchical Decentralized Control for Enhanced Stability of Large-Scale Power Systems
… in the future, may also account for the non-linear coupling that exist between machine rotor angles and bus voltages in power system models. As a future work, we propose the use of statistical techniques like random-effects regression and saddlepoint approximation method to reliably estimate …
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Theoretical and numerical study of nanostructures
… involve localized (on-site) and extended phonons linearly$\sp\dagger$ coupled to the electron. The coupling is localized to the ""cavity"" region only. Due to the resonant nature of electron scattering, the greatest influence of dissipation on the scattering of electron is presumably inside the …
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Theoretical and numerical study of nanostructures
… involve localized (onsite) and extended phonons linearlyt coupled to the electron. The coupling is localized to the ""cavity"" region only. Due to the resonant nature of electron scattering, the greatest influence of dissipation on the scattering of electron is presumably inside the cavity …
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Variability of black-hole accretion discs: a theoretical study
… discs. The excitation mechanism involves a non-linear coupling between the global deformation, an intermediate wave and the inertial mode and results, under a variety of conditions, in growth of the latter. Excitation is only effective when global deformations are capable of reaching the inner …
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Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple
… doubly salient pole structure and the highly non-linear coupling between torque, rotor position and phase current. As a result of the torque ripple on the shaft, unwilling large acoustic noises are generated. The large current ripple at the DC bus input requires large electrolytic capacitors for …
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Synchronization in Coupled Opto-thermal Silicon MEMS Limit Cycle Oscillators
Micro- and nano-scale oscillators exhibit nonlinear phenomena such as limit cycle oscillations, self-synchronization, and frequency entrainment to an external drive. In this work, we chart the behavior of silicon MEMS oscillators that are nominally 40 µm long and 205 nm thick, mechanically coupled, …
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Distributed Optimization Algorithms for Networked Systems
… subject to convex local constraints and</p><p>linear coupling constraints. We establish the convergence of ADAL and also show</p><p>that it has a worst-case O(1/k) convergence rate, where k denotes the number of</p><p>iterations.</p><p>Moreover, we show that ADAL converges to a local minimum of …