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 383 for “"Oscillators"”.
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Coupled oscillators near resonance
… study the dynamics of two conservative librating oscillators with perturbations from a linear displacement coupling and non-Hamiltonian forces such as damping. We examine the dynamics of these systems when they are near a resonance using secular perturbation theory. We show that near resonance a …
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Q-OSCILLATORS AND THEIR APPLICATIONS
… In this thesis, we begin with a study of q-oscillators which have gained prominence in the literature. Primarily introduced as objects providing realizations to some of the quantum algebras, they have assumed an identity of their own in the general framework. Indeed, it has been shown that …
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Graphene NanoElectroMechanical Resonators and Oscillators
… I will present the study of graphene NEMS oscillators with positive feedback loop. The demonstrated oscillators are self-sustained (without external radio frequency, RF, stimulus), and the oscillation frequencies can be controlled by tension{i.e.}, (applied gate voltage). I also carefully …
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Synchronization in ensembles of nonisochronous oscillators
Diese Arbeit analysiert Synchronisationsphaenomene, die in grossen Ensembles von interagierenden Oszillatoren auftauchen. Im speziellen werden die Effekte von Nicht-Isochronizitaet (die Abhaengigkeit der Frequenz von der Amplitude des Oszillators) auf den makroskopischen Uebergang zur …
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Interaction of modes in magnetron oscillators
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1950.
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Optimal Control of Weakly Forced Nonlinear Oscillators
… to synthesize optimal controls for nonlinear oscillators described by reduced order dynamical systems. Control of neural oscillations by external stimuli has a broad range of applications, ranging from oscillatory neurocomputers to deep brain stimulation for Parkinson's disease. In this …
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Coherence and synchronization of noisy-driven oscillators
… ability to synchronize identical self-sustained oscillators. First, we demonstrate that the coherence of a noisy or chaotic self-sustained oscillator can be efficiently controlled by the delayed feedback. We develop the analytical theory of this effect, considering noisy systems in the Gaussian …
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Analysis and Design of Low-Jitter Oscillators
This thesis presents an examination of the jitter performance of different oscillator types in the presence of flicker noise, white noise and power supply noise. Key results are achieved using time domain simulations to determine cycle jitter of several different oscillator architectures, …
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Analysis of inductance-capacitance voltage-controlled oscillators
… of inductance-capacitance voltage-controlled oscillators (LC VCOs), specifically, double switch cross-coupled oscillators. Fundamentals on LC VCOs, like oscillation conditions, classical LC VCO architectures, inductor and capacitor choices, and phase noise calculations are described. A …
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A study of contraction theory and oscillators
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Femtosecond optical parametric oscillators for the mid-infrared
… spectral regions. The three optical parametric oscillators which were constructed were synchronously- pumped by a self-modelocked femtosecond Ti:sapphire laser. Noncollinear critical birefringent phasematching was used in an oscillator based on KTiOAsO4, which was tunable from 1.03 to 1.2 mum …
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Characterization Of Critical Network Components Of Coupled Oscillators
… of the network structure of loosely coupled oscillators based on observing the behavior of the network, specifically, node synchronization. The determination of the requisite characteristics and underlying behaviors necessary for the application of a theoretical mechanism for determining the …
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Parity-Time Symmetry in Lasers and Optoelectronic Oscillators
… selection in lasers and optoelectronic oscillators (OEOs). This thesis focuses on the use of PT symmetry for mode selection in fiber ring lasers and OEOs. Five PT-symmetric architectures are proposed and experimentally demonstrated in this work to address challenges such as structural …
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Multi-Physical Study of MEMS Resonators and Oscillators
… resonators (TPR) and self-sustained oscillators (TPO) to different gases and pressures. It is demonstrated that the resonant frequency of such devices follows particular trends in response to the changes in the surrounding gas and its pressure. A mathematical model has been derived to …
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Nanoscale magnetic resonance imaging using silicon nanowire oscillators
… for displacement detection of silicon nanowire oscillators using a polarized fiber-optic interferometer. Even though the nanowires have widths much smaller than optical wavelengths, interferometry enables sensitive displacement detection because the nanowires exhibit enhanced optical scattering …
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Frequency-tunable second-harmonic submillimeter-wave gyrotron oscillators
This thesis reports the design and experimental demonstration of frequency-tunable submillimeter-wave gyrotrons operating in continuous wave (CW) at the second harmonic of the electron cyclotron frequency. An unprecedented continuous frequency tuning range of more than 1 GHz has been achieved in …
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