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 20 for “"Simple Harmonic"”.
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Use of simple-harmonic forces in the non-relativistic quark model
… is similar to that predicted by a paraquark harmonic-oscillator shell model. ""Exact three-body Schroedinger wave functions are used to compute the N~partial decay widths, assuming the pion emission takes place via a one-quark de-excitat~on, . The agreement with experiment is sufficiently …
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Investigation into compactifed dimensions : Casimir energies and phenomenological aspects.
… each mode of a fixed wavelength behaves like a simple harmonic oscillator. A quantum mechanical property of a simple harmonic oscillator is that the ground state exhibits zero-point fluctuations as a consequence of the Heisenberg Uncertainty Principle. These fluctuations give rise to a number of …
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Mathematical Analysis of Upscaling Well Log Data from Sonic to Seismic Resolution
… have been published and discussed, such as the Simple Averaging method, the Backus Averaging method, the Pair Correlation Function “PCF” method, the General Singular Approximation “GSA” method, and the Markov Chain Monte Carlo “MCMC” method. These methods are evaluated in this thesis, and new …
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Theory of nucleation of water properties of some clathrate like cluster structures
… discussed. The hydrogen bonds were treated as simple harmonic oscillators for the purpose of calculating normal mode frequencies. The Helmholtz free energy of formation of the cluster is calculated from the appropriate partition functions. For these clathrate-like structures the free energy of …
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The aerodynamic and structural study of flapping wing vehicles
… aerodynamic forces acting on flapping wings in simple harmonic oscillations is undertaken in order to help conduct and optimize the aerodynamic and structural design of flapping wing vehicles. The research is focused on the large scale ornithopter design of similar size and configuration to a …
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The fluid-coupled motion of micro and nanoscale cantilevers
… is passive. This system is modeled as two simple harmonic oscillators in an array whose motion is coupled through the fluid. Using simplified geometries and the unsteady Stokes equations, an analytical expression is developed that describes the dynamics of the passive cantilever. Full …
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The Dynamic characterisation of ESR prosthetic running feet: an investigation of the key parameters affecting their performance.
… foot can be considered to act in accordance with Simple Harmonic Motion, but this does not appear to be reflected by the prescription processes currently employed by manufacturers. The research question is asked: ‘Is the current method of prescribing prosthetic ESR running feet appropriate and are …
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Dicke enhanced energy transfer via off resonant coupling y Christopher Black.
… The entire system is placed into a low-frequency simple-harmonic-oscillator (SHO) which indirectly couples the two collections of systems. Therefore, if the SHO is removed there is no energy exchange. The frequencies of the oscillator and two-level systems are different (offresonant); therefore, …
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Analysis of Buckled and Pre-bent Columns Used as Vibration Isolators
… and stiffness. The columns will be subjected to simple harmonic motion applied at the base or to a multi-frequency base excitation. The response of each model is measured by the deflection transmissibility of the supported load over a large range of frequencies. Effective models reduce the motion …
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Linear and nonlinear resonance of water waves near periodic structures
… in an infinite sea, trapping is imperfect. Simple harmonic incident waves can excite a nearly trapped wave at one of the eigen-frequencies through a linear mechanism. However the maximum amplification ratio increases monotonically with the number of the cylinders, hence the solution is …
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Application of classical non-linear Liouville dynamic approximations
… operator is formulated and applied to several simple one-dimensional physical problems, whose solution is obtainable in terms of known analytic functions. The scheme is shown to be extendable relative to cross products and powers of the variables involved. The approximation scheme is applied to …
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Electromagnetic stirring using a travelling magnetic field
… in the opposite direction of the applied field. Simple harmonic motion of the field is also effective, and becomes more so as the frequency increases (at fixed wavelength) but at the expense of overall fluid velocity.
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Interplay of Geometry and Mechanics: Disordered Spring Networks and Shape-changing Cerebella
… the effect of such a non-linear force for a simple harmonic oscillator like system and see that there too we obtain cusped `folds'. We also discuss steric confinements on the growing cerebellum and a paradigmatic demonstration of hierarchical folds in the cerebellum.</p>
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Forced, nonlinear, planar and nonplanar oscillations of a cantilvered beam including static deflection
… of a slender, elastic, cantilevered beam to a simple harmonic excitation is investigated. The effects of nonlinear curvature, nonlinear inertia, viscous damping and static load are included. The nonlinear equations governing the motion of the beam are derived by the Lagrangian approach. The …
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Numerical simulations of wings in unsteady flows
… the mean aerodynamic loads on a wing executing a simple-harmonic heaving motion are higher than the corresponding loads on the same wing in steady flight at the mean height and the same angle of attack. The increases are about the same for all heights. Hence, these preliminary results suggest that …
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Population-specific predictions for the finite Kuramoto model and collective synchronization in a system with resonant coupling
Synchronization of coupled simple harmonic oscillators is a well-studied problem in advanced undergraduate mechanics courses and the solution amounts to solving an eigenvalue problem. Synchronization of populations of auto-oscillators is a comparatively new field of study. The first scientists to …
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Correlation Force Spectroscopy for Single Molecule Measurements
… the data can also be accurately fitted using a simple harmonic oscillator model, which can be used for rapid rheometric measurements, after calibration. The mechanical properties of biomolecules such as dextran and single stranded DNA (ssDNA) are also described. CFS measurements of single …
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Aero-servo-viscoelasticity theory: lifting surfaces, plates, velocity transients, flutter, and instability
… is that flutter is the first occurrence of simple harmonic motion of a structure, and the flight velocity at which this motion occurs is taken as the flutter speed. The expanded definition indicates that the flutter condition should be taken when simple harmonic motion occurs and certain …
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Microbubble streaming flows for non-invasive particle manipulation and liquid mixing
… patterns. In contrast to steady streaming due to simple harmonic oscillations of a solid object, microbubbles exhibit frequency dependent and more complex shape modes. As the streaming flow patterns are caused by oscillations of microbubbles in contact with walls of the set-up, an understanding of …
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FUNDAMENTAL TECHNOLOGIES FOR THE OPTO MECHANICAL GYROSCOPE
… of the quantum mechanical ground state of a simple harmonic oscillator, opto-mechanics spans a very wide range of the physical world. Optical systems with their capability of high sensitivity have been evaluated for applications as sensors like heart rate monitors, gas sensors and LIDARs. …