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 92 for “"one-dimensional model"”.
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A one dimensional model of convection in iron core collapse supernovae
… of convection in these supernovae are multi-dimensional codes. While these codes provide insight into the role of convection in supernova, their computationally intensive nature makes it impractical to run these codes repeatedly under different physical assumptions and to explore the physics …
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One-dimensional model of fecal coliform in Nahr Ibrahim River (Lebanon)
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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A one-dimensional model for odd nitrogen in the stratosphere, mesosphere, and thermosphere.
Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Meteorology.
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A High Order Correction of the Energy of a One Dimensional Model of an H2+ Molecule
The ground state electron wavefunction of some molecules has a non-zero angular momentum about the internuclear axis. Molecular rotational momentum can couple with this angular momentum, splitting the energy degeneracy of the two directions of motion about the internuclear axis. Performing a …
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The Extended Hubbard Model: Theory, Simulations, and Applications
The Hubbard model is one of the most widely studied many-body models for interacting electrons in solids. Here we present a study of the Extended Hubbard model, which provides a more realistic description of real materials by including some longer-range Coulomb interactions. We discuss the …
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Low coherence speckle interferometry (LCSI) for the characterisation of adhesive bonded joints
… out. To quantify the measurement results an one-dimensional model is developed.
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Dynamic compensators for a nonlinear conservation law
… by Burgers’ equation. This equation provide a one dimensional model for certain convection—diffusion phenomena. A linearized model is used to compute a robust controller (MinMax), a LQG controller and a fixed-order-finite-dimensional control law (Optimal Projection) by minimizing various energy …
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Earthquake location using a 3D velocity model : an example in Sichuan Province, China
We investigate the benefits of applying three-dimensional velocity models to seismic event location. We develop a technique for three-dimensional seismic event location, utilizing a finite difference method for travel time calculation and a grid search method for location. We apply this technique …
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One-Dimensional, Finite-Rate Model for Gas-Turbine Combustors
An unsteady, finite-rate, one-dimensional model has been developed for the analysis for gas-turbine combustors. The basis of the model is the one-dimensional, integral form of the conservation equations for multi-species, non-equilibrium, reacting mixtures. Special procedures were devised for the …
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Delamination buckling, postbuckling, and growth in axially loaded beam-plates
The purpose of this study is to develop a simple one-dimensional model to analyze axially loaded beam-plates containing cracks which extend through the thickness of the beam-plates. Although the material analyzed is isotropic, these cracks will be referred to as delaminations. Buckling, …
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Mathematical modelling of the plunger pump operation with numerical methods for simulating the flow across the valve
… pump starts to generate a clicking noise. A one-dimensional model was built for studying the ow of a typical plunger pump operation. The velocities and pressures are calculated at certain interesting locations. Pressure jumps have been found while opening or closing the valves. The valve …
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Torsional and flexural control of sandwich composite beams with piezoelectric actuators
A mathematically one-dimensional model was developed to predict the static response of composite sandwich beams subjected to loads induced by piezoelectric (PZT) actuators. The model was derived using Reddy's (1984) displacement field for a laminated plate which consists of cubic variation of the …
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Modeling and Analysis of Photonic Crystal Waveguides
… aspects of photonic crystal waveguides through modeling and simulation. We introduce a one-dimensional model for two-dimensional photonic crystal fibers (PCFs), analyze tapered PCFs, analyze planar photonic crystal waveguides and one-dimensional PCFs with infinite periodic cladding, and …
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Face recognition using Hidden Markov Models
… using a novel technique based on Hidden Markov Models (HMMs). Through the integration of a priori structural knowledge with statistical information, HMMs can be used successfully to encode face features. The results reported are obtained using a database of images of 40 subjects, with 5 training …
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Ultrasonic wave propagation in thick, layered composites containing degraded interfaces
… degraded bonds is investigated. A theoretical one-dimensional model of three attenuative viscoelastic layers containing two imperfect interfaces is introduced. Elastic material properties and measured 'values of ultrasonic phase velocity and attenuation are used to represent E-glass and vinyl …
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One Dimensional, Transient Model of Heat, Mass, and Charge Transfer in a Proton Exchange Membrane
A transient, one-dimensional, model of the membrane of a proton exchange membrane fuel cell is presented. The role of the membrane is to transport protons from the anode to cathode of the fuel cell while preventing the transport of other reactants. The membrane is modeled assuming mono-phase, …
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The constitutive modeling of shape memory alloys
This dissertation presents a one-dimensional thermomechanical constitutive model for shape memory alloys based on basic concepts of thermodynamics and phase transformation kinetics. Compared with other developed constitutive relations, this thermomechanical constitutive relation not only reflects …
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The Influence of Cellular Structure on the Dynamics of Detonations with Constant Mass Divergence
… combustion waves that have a complex three-dimensional cellular structure. There is growing experimental evidence that the cellular structure of detonations promotes their propagation in the presence of losses. In spite of that, the conventional model for the detonation structure, known as …
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Study of particulate matter formation and evolution in near-field aircraft plumes using a one-dimensional microphysical model
… from aircraft engines. This thesis presents a one-dimensional microphysics and chemical kinetics model that is used to study the formation and evolution of particulate matter in near field aircraft plumes at ground level. The initial exhaust properties were obtained from engine data and plume …
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