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.
Results
Showing 1 to 20 of 29 for “"Dynamic Phenomena"”.
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Magnetoconductance and Dynamic Phenomena in Single-Electron Transistors
<p>The quantum mechanical nature of electrons at very low temperatures has posed interesting results in the resistivity of metals over the last century. When the temperature nears absolute zero, the resistivity due to electron-electron interactions and electron-phonon interactions become very small …
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Self-Diffusion and Temperature Mapping of Food Materials Using MRI
… (MRI) techniques is useful for understanding dynamic phenomena which occur during food processing. The overall objective of this study was to measure the self-diffusion coefficient using magnetic resonance imaging (MRI) techniques and convert the self-diffusion images to temperature images.
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Role of tip clearance flow on axial compressor stability
An examination of the fluid dynamic phenomena that link tip clearance flow to the formation of short length-scale (spike) rotating stall disturbances has been carried out. It is found that the onset of growth in tip clearance blockage characterizes the lowest flow coefficient for which a steady …
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A finite element analysis of high kappa, high field Ginzburg-Landau type model of superconductivity
… Finally, some well known steady-state and dynamic phenomena valid for type II superconductors are illustrated numerically.
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Análise dos fenômenos transitórios em câmaras de eclusas através do método das características bi-dimensional
… during filling or emptying procedures. The hydrodynamic phenomena are caused by unsteady filling and were studied considering the chamber’s two horizontal directions. The solution was obtained using the Method of Characteristics. Two theorical examples of filling were developed and their exact …
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Impact Mechanics Of A Lap Joint: A Theoretical-Based Parametric Study
… reveals impulse frequency responses with unique dynamic phenomena. Using steady state response, six influential parameters are studied: damping ratio, contact stiffness, position of intermediate springs, gaps, excitation amplitude and beam height. For all parameters, the system response was …
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Renewable electric power systems energy yield and performance estimation
… attributes that are largely static-the only dynamics are due to changes in system configuration due to failures and repairs in constituent elements. On the other hand, SHS can model a wide variety of dynamic phenomena, and provide significant flexibility over Markov models. From an …
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Segurança de sistemas de potência em regime transitório considerando incertezas
… Thesis presents a new methodology for transient dynamic analysis of power systems, submitted to different types of uncertainties represented probabilistically. The dynamic phenomena of electromechanical nature, involving advanced models of generators and automatic voltage regulators, are dealt …
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Dynamic travel time models for pricing and route guidance : a fluid dynamics approach
This thesis investigates dynamic phenomena that arise in a variety of systems that share similar characteristics. A common characteristic of particular interest in this work is travel time. We wish to address questions of the type: How long does it take a driver to traverse a route in a …
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Processing random signals in neuroscience, electrical engineering and operations research
… that describe, explain, predict and control dynamic phenomena. Noise is modeled through Brownian Motion and the research problems are mathematically addressed by different versions of a generalized Langevin equation. Our mathematical models utilize stochastic differential equations (SDEs) and …
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The Dynamics of Rigid Bodies on Moving Deformable Support Media
… a solid block on a moving deformable base is a dynamic problem, that despite its apparent simplicity, involves a number of complex dynamic phenomena such as impacts, sliding, geometric and material nonlinearities and, under some circumstances, chaotic behavior. For that reason, since the first …
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Langmuir Probe Instrument Suite for Mesosphere Turbulence Experiment Mission
… mesosphere region (80-120 km) is a host of many dynamic phenomena such as the noctilucent clouds, breaking gravity waves, inversion layers, settlement of mesospheric smoke particles, etc. As such it is critical to have a comprehensive suite of plasma diagnostics that can unambiguously measure …
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Studies of transient phenomena in heterogeneous catalysis
… step ·model (ESM) is proposed to account for the dynamic features of transient experiments. The modification consists of a dependence of the activation energy for alkene desorption from the catalyst on the surface coverage of the alkene. Simulations with unmodified versions of tife ESM and rate …
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Towards realistic interactive sand : a GPU-based framework
… arrangement of particles. Our model shows highly dynamic phenomena, such as splashing and avalanching, as well as static dune formation. Moreover, by utilising standard metrics taken from granular material science, we show that the simulated sand behaves in accordance with previous numerical and …
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Transmission Line Dynamics Modeling For Power Electronics-Enabled Control in the Electric Power Systems
… power systems, understanding the rates at which dynamic phenomena evolve is critical. Classically, power systems operate on multiple time scales, with slower mechanical dynamics from synchronous machines, faster electromechanical controls and protection, and very fast electrical dynamics from …
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Nonlinear Vibrations of Cantilever Beams and Plates
… excitations is also conducted. Various nonlinear dynamic phenomena, like two-to-one and three-to-one internal resonances, external combination resonance, energy transfer between widely spaced modes via modulation, period-doubled motions, and chaos, are demonstrated using a single plate. It is …
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Simulating Bluff-body Flameholders: On the Use of Proper Orthogonal Decomposition for Combustion Dynamics Validation
… new opportunities for engineering insight into dynamic phenomena. In the work presented here, a novel use of proper orthogonal decomposition (POD) is described to validate the structure of dominant heat release and flow features in the flame, shear-layer, and wake of a bluff-body-stabilized …
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Reachability analysis and deterministic global optimization of differential-algebraic systems
… are used to model an incredible variety of dynamic phenomena. In the chemical process industry in particular, the numerical simulation of detailed DAE models has become a cornerstone of many core activities including, process development, economic optimization, control system design and …
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On the observations of autowaves and avalanches in an aluminum magnesium alloy
… local deformation characteristics look like in a dynamically strain aging material before the onset of macroscopic instability. A solution strengthened aluminum magnesium alloy was tested in a work hardened condition in uniaxial tension under a constant applied displacement rate. In situ digital …
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Infrasound Propagation in Terrestrial Planetary Atmospheres
… of waves, and therefore it is likely that these dynamic phenomena are present (and may be detected) on other terrestrial planets with similar atmospheric structures.</p> <p>Using a one-dimensional, nonlinear, compressible atmospheric acoustics model, this thesis seeks to investigate the …
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