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 27 for “"density variation"”.
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Electron density variation with incident power in a steady state microwave discharge.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1968. B.S.
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Influence of lightning on electron density variation in the ionosphere using WWLLN lightning data and GPS data
… is caused by irregularities in electron density which act as wave scatterers, it is feasible that lightning-induced TIDs may provide the mechanism for causing the concomitant and co-located changes in ionospheric total electron con-tent that was observed. Both the lightning and the …
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Imperfection-Aware Design of CNFET Digital VLSI Circuits
… today from achieving such ideal benefits. CNT density variation and metallic CNTs are the dominant type of CNT variations/imperfections that cause performance variation, large static power consumption, and yield degradation. We present an imperfection-aware design technique for CNFET digital …
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Development of algorithms for asphalt pavement compaction monitoring utilizing ground penetrating radar
The density of asphalt mixture plays an important role in the performance of asphalt pavement. Compaction is critical for achieving the desired density during the construction of asphalt pavement. To ensure successful compaction, the density of asphalt pavement should be monitored in a timely …
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Study of the role of differential diffusion and equation of state on the features of stably stratified turbulent channel flow using direct numerical simulations
… applications to environmental flows. The density variation in such flows, particularly that observed in water bodies depends on temperature and salinity (salt content) through an equation of state (EoS). The molecular diffusion of the temperature and salinity in such flows differ …
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Image-Based Morphological Modeling of Soft and Bony Tissue with Applications in Prognostics and Medical Device Design
… resonance 1 images is used to quantify shape and density variation of structures and to associate these variations with existing abnormalities and dysfunctions for disease prognosis and prediction of injury risk. Analyzing soft tissue structures is particularly challenging due to the lack of …
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Textural and Harmonic Density in Selected Choral Works (1992--2003) by Eric Whitacre
… The author created a system for mapping textural density variation on linear graphs. These graphs, combined with the author's explanation of Whitacre's voice-leading process, provide a clear understanding of Whitacre's compositional process. The author has concluded that in the works studied, …
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Thermal-hydraulic analysis of a spectral shift reactor core
… temperature, the mass flow rates, and the power density. The cladding temperature and the coolant pressure and temperature are calculated throughout the fuel assembly. Three test cases were performed using a conceptual reactor core design. The fuel to water ratio of this design can be varied from …
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Lattice Boltzmann simulations of multiphase flows
… can accurately capture flow physics provided the density ratio among fluid phases is not large. Because ACRC equipment often harbor high density ratio flows, the standard LBM procedures require modification to accommodate higher density ratio problems. We investigate one such modification to the …
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Turbulent convection in the anelastic rotating sphere : a model for the circulation on the giant planets
… than a spherical shell (including the strong variations in gravity and the equation of state). Different from most previous 3D convection models, this model is anelastic rather than Boussinesq and thereby incorporates the full density variation of the planet. We show that the density gradients …
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Dendroclimatology of Pinus sylvestris L. in the British Isles
A study of the properties of tree-ring density and ring-width chronologies from five sites in the British Isles, two in Sweden and two sub-fossil sites in Northern Ireland is described. The technique of x-ray densitometry is used to measure density. It is shown that it is possible to use x-ray …
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Cell State Identication by Mass, Density, and volume
… tools, we developed four methods to measure cell density, the ratio of mass to volume. We first measure the average density of cell populations using the SMR and a Coulter counter. We observe that cell density increases prior to bud formation at the G1/S transition of budding yeast, which is …
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Fabrication of engineered ceramic components by the slurry-based three dimensional printing process
… casting kinetics lead to two phenomena: density variation and slurry migration. The packing density of powder beds was higher in regions printed with binder, indicating that the density was higher in regions with lower casting rates. Slurry migration occurred due to the difference in …
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Transport and Anisotropy inside Ionic Polymer Membranes
… level. These structures correspond to a density variation of SO₃⁻ groups, which define a distribution of local electrical potentials that fluctuate with temperature and nature of ionic media.
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Exact reconstruction of ocean bottom velocity profiles from monochromatic scattering data
… reconstruct velocity profiles in the presence of density variation when the experiment is conducted at two frequencies. Our results provide a good understanding of the issues involved in conducting a monochromatic deep ocean bottom experiment and constitute a promising technique for processing the …
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Developing a Design Procedure for Pavement Millings for New and Rehabilitated Unpaved Gravel Roads
… on specimens with 15% and 22% air voids. The density variation significantly affected dynamic modulus value. Structural pavement designs were carried out based on both RAP milling layer coefficients separately using the PaveXpress software. Douglas County uses two traffic design levels for low …
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Investigation of Particle Velocity and Drag with Spherical and Non-Spherical Particles Through a Backward Facing Step
… or decelerating gaseous flow. The large density variation between phases creates the potential for significant differences in velocity known as velocity slip. Flow over a backward facing step provides a well characterized, turbulent, decelerating flow useful for measuring the relative …
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Digital Test of Composite Material Using X-Ray Tomography and Finite Element Simulation
… processing. The voids distribution as well as density variation was quantified to verify the model microscopic characteristics. FORTRAN programs were developed to automatically achieve data transfer and model generation, e.g. boundary identification and ABAQUS simulation model generation. …
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Turbulent convection in an anelastic rotating sphere : a model for the circulation on the giant planets
… than a spherical shell (including the strong variations in gravity and the equation of state). Different from most previous 3D convection models, this model is anelastic rather than Boussinesq and thereby incorporates the full density variation of the planet. We show that the density gradients …
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Hydrodynamic stability of a premixed flame subjected to transverse shear
… on the amplitude of flame deformation and the density variation, the solver is used to conduct a series of numerical experiments to explore the fully nonlinear behaviors of premixed flames in a shearing flow.
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