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 31 for “"oscillator-model"”.
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Learning Emergent Gaits with Decentralized Phase Oscillators: on the role of Observations, Rewards, and Feedback
We present a minimal phase oscillator model for learning quadrupedal locomotion. Each of the four oscillators is coupled only to itself and its corresponding leg through local feedback of the ground reaction force, which we interpret as an observer feedback gain. The oscillator itself is …
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Numerical and Analytical Analysis of Vortex Induced Vibrations of a Pipeline Close to Seabed
… dissertation numerically. Firstly, a novel wake oscillator model is extended from the classic Van der Pol equation by introducing an additional nonlinear term and two empirical coefficients to account explicitly for the effects of the gap ratio and mass ratio. Then, the model parameters are …
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Assessment of high-fidelity collision models in the direct simulation Monte Carlo method
… has allowed for more complex physics to be modeled in the DSMC method. Beginning with the first paper on DSMC in 1963, 30,000 collision events per hour were simulated using a simple hard sphere model. Today, more than 10 billion collision events can be simulated per hour for the same …
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Interaction cross sections needed for simulation of secondary electron emission spectra from thin metal foils after fast proton impact
… the double cross section into the generalized oscillator strength and kinematic factors. The generalized oscillator strength or Bethe surface of the medium is obtained by using a semi-empirical optical oscillator strength distribution published in the literature and an extension algorithm based …
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Design and analysis of high performance low noise oscillators and phase lock loops
… this challenge, this thesis considers the modeling and design of two fundamental clock generation circuits – the VCO and PLL.<br/><br/>An improved ring oscillator topology is proposed which has the advantage of an ultra wide tuning range. A novel noise aware ring oscillator model is also …
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A trajectory-based approach to modeling nonlinear infrared spectra : interrogating strong hydrogen bonds and proton transfer
… work describes a phenomenological approach for modeling linear and nonlinear infrared spectroscopy of condensed phase chemical systems, focusing on applications to strongly hydrogen bonded complexes. To overcome the limitations inherent in common analytical models, I construct full time …
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Mathematical modelling of the light input signalling pathways to the Arabidopsis circadian oscillators
… regulate the dynamics of Arabidopsis circadian oscillators. Mechanistically, light regulation of the circadian oscillator occurs through multiple synergistic and/or independent molecular signalling pathways. Physiologically, it manifests as entrainment under periodic environments and as …
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Enhancing Nonlinear Ultrasonic Methods for Laboratory and Clinical Applications
… left ventricle described using a damped harmonic oscillator model as an approach for identifying the underlying causes of the observed variation.
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Effects of diet composition and length of feeding restriction on the locomotor rhythms of Mus musculus
… results of this study are consistent with a Two-Oscillator Model for control of activity rhythms.
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Parametric Soil-Structure Modeling for Rapid Climatic Disaster Response
… analyze coastal structures that take a system modeling approach. Such a system approach should consider structuresthat are subjected to a combination of extreme forces and changes of boundary conditions, which may include hydrodynamic wave effects, hydraulic buoyancy, debris impact, and …
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Statistical Inference for Stochastic Differential Equations using Splitting Schemes
… theory is illustrated by applying the Kramers oscillator model to model paleoclimate data. The thesis further extends to developing multivariate Pearson diffusion models, which generalize existing univariate Pearson diffusion frameworks by incorporating linear drift and a quadratic function in …
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Generation and application of squeezed light
… been investigated: squeezing the reservoir which models the incoherent pumping process and the spontaneous emission or, alternatively, squeezing the other heatbath, modelling the vacuum modes entering the laser cavity. The analysis includes a detailed discussion of the semiclassical theory, the …
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Theoretical modeling of pilot-wave hydrodynamics
… we develop and apply a number of theoretical models describing the dynamics of a droplet walking on a vibrating liquid bath. We first review the hierarchy of theoretical models developed to describe this system. We begin with the stroboscopic model of Oza et al. (2013), and elucidate the role …
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Development of a force field with condensed phase consistent charges for N,N' - dialkylimidazolium room temperature ionic liquids
Most force field models for Room temperature ionic liquids cannot properly elucidate statics and dynamics. It is in this context that we set to assess the most efficient way to model RTILs while maintaining the integrity of the liquids statics and dynamics. The development approach begins with the …
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A computational approach to spectroscopy of molecular systems : modeling, prediction, and design
This thesis describes a series of approaches for modeling spectroscopy of molecular systems in aqueous environments, focusing on proton transfer, water dynamics, and hydrogen bonding interactions. The spectroscopy motivating this work ranges from nuclear to vibrational to electronic, spanning from …
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Dynamics of F0 planning and production: contextual and rate effects on Thai tone gestures
… with a split-gesture competitive coupling model of tone. Third, tonal contexts produce effects on inter- and intragestural tonal timing that offer a partial basis for the dissimilatory effects, albeit not a complete one. Fourth, asymmetric effects of rate on consonantal closures, releases, …
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Near infrared absorption by SH<sup>-</sup> in alkali halides
… <p>It has been found that the Devonshire Model does not agree with the measured spectra. Somewhat better agreement is found with localized oscillator models, but it is impossible to decide unambiguously between <111>, <110>, or <100> potential minima directions because the individual …
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Breaking the Cycle: the Rise and Fall of Conversion Cycle Limited Three-Wave Mixing
… space and time. We develop a damped Duffing oscillator model that unifies the description of conventional OPA with OPAs that use linear absorption \cite{Ma:15, El-Ganainy:15, Zhong:16, Li:17, Ma:17} or SHG \cite{Flemens:21} to remove idler photons and enhance efficiency. An experimental …
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Stable locomotion control of bipedal walking robots : synchronization with neural oscillators and switching control
… to stable legged locomotion control (neural-oscillator based control and switching control) are studied for achieving bipedal locomotion stability. Postural stability is realized by structural dynamics shaping, and gait stability is achieved by synchronization with neural oscillators and …
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Correlation Force Spectroscopy for Single Molecule Measurements
… connects the gap between the two cantilevers. Modeling of the correlations yields the effective stiffness and damping of the molecule. The resolution in stiffness is limited by the stiffness of the cantilever and the frequency by the natural frequency of the cantilevers, but, importantly, the …
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