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 53 for “"Density distributions"”.
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Model calculations of current and density distributions in dissipative Hall bars
… via the self-consistently calculated density profile. The existence of "incompressible strips" with integer Landau level filling factor is investigated within a Hartree-type approximation, and nonlocal effects on the conductivity along those strips are simulated by a suitable averaging …
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Simulation of density distributions from gravitational data with application to mapping a glacier
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1960.
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A Gauss-Seidel scheme for determining atmospheric temperature profiles in atmospheres with fixed water density distributions
The details of an algorithm which models the earth's atmosphere are presented. Specifically, it is an algorithm which produces the atmospheric temperature profile for this model atmosphere. The densities of the infrared active gases are left as free input parameters to facilitate the algorithm's …
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A study of the crystal chemistry, electron density distributions, and hydrogen incorporation in the Al₂SiO₅ polymorphs
… of the localized electron probability density. Six distinct types of ELF isosurfaces were observed in the Al₂SiO₅ polymorphs resulting from differences in the geometry, coordination, and coordinated cation atomic number surrounding the oxygens within the crystal structures. The ELF was …
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Stability and Change in Goal Orientation and Their Relationship with Performance: Testing Density Distributions Using Latent Trait-State Models
… the two theoretical perspectives called the density distribution approach. By incorporating Fleeson's approach with Latent Trait-State (LTS) covariance matrix models (Steyer, Ferring, & Schmitt, 1992) this study tested the hypothesis that goal orientation, whether measured as a general trait, …
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Masses of globular clusters
… in the star - cluster line strengths. Surface density distributions have been derived from photoelectric surface photometry (using centered apertures and small aperture drifts across the cluster) and from star counts. These surface density distributions were then compared with the theoretical …
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Masses of globular clusters
… in the star - cluster line strengths. Surface density distributions have been derived from photoelectric surface photometry (using centered apertures and small aperture drifts across the cluster) and from star counts. These surface density distributions were then compared with the theoretical …
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Ab Initio Nuclear Structure Calculations for Light Nuclei
… 20%.</p> <p>We then introduce the One-Body Density Matrix. We present a method to remove the</p> <p>spurious center-of-mass component from the space-fixed density distribution. We present space-</p> <p>fixed and translationally-invariant density distributions for various states of 6 Li, 7 …
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Bonding properties of coordinated polyhedra in molecules and crystals
Force constants and electron density distributions in coordination polyhedra in molecules and crystals are modeled using Hartree-Fock molecular orbital methods. Model bond-stretching force constants calculated for coordination polyhedra in a series of nitride, oxide and sulfide molecules are ~ …
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Nested Well Plasma Traps
… calculation of potential and plasma density distributions are developed. Analyses are presented of the use of nested well Penning traps for several applications. The analyses include: calculations of timescales relevant to the applications, e.g. reaction, confinement and relaxation …
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Deep Learning for Space Object Density Distribution Prediction
… the long-term evolution of space object density. A large dataset is generated, using the MIT Orbital Capacity Assessment Tool – Monte Carlo (MOCAT-MC), simulating thousands of scenarios across varying launch, disposal, and maneuver parameters. A Convolutional Gated Recurrent Unit …
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An acoustic bubble density measurement technique for surface ship waters
… well suited for determining ship wake bubble density distributions. The theory, considerations, experimental results, and recommendations of this thesis support the application of the dual frequency acoustic techniques to the ship wake problem. Keywords: Theses; Acoustic bubble density …
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Atomic processes in nova shells
… is also described. The effects of non-uniform density distributions in nova shells have been investigated and the observational consequences discussed. A model of the CP Pup shell is described and the evolution of this plasma during the nova's constant luminosity phase traced. The properties of …
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Distribution of matter in clusters of galaxies
… of a multi-wavelength analysis of cluster mass density distributions and the properties of the intra-cluster medium were demonstrated through the examples of MS2137-23 and Abell 2218. Both clusters possess a giant arc that constrains the cluster central mass. In the case of Abell 2218 where …
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Distribution of matter in clusters of galaxies
… of a multi-wavelength analysis of cluster mass density distributions and the properties of the intra-cluster medium were demonstrated through the examples of MS2137-23 and Abell 2218. Both clusters possess a giant arc that constrains the cluster central mass. In the case of Abell 2218 where …
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A numerical study of shock-induced hot spot generation in energetic material
… reaction, such as temperature, mass fraction and density distributions, can be obtained from the results. The governing equations, together with the initial and interface conditions, are solved numerically for a series of test cases for RDX (C3H6N6O6) and HMX (C4H8N8O8). The results shows that …
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Assessing the mechanical microstructure of shale by nanoindentation : the link between mineral composition and mechanical properties
… clay composite scale with the clay packing density in the material, but otherwise do not depend on mineral composition. These scaling relationships are representative of a granular composite of spherical particles, and lead to identification of intrinsically anisotropic material invariant …
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Recovering the hydrocarbon distributions in Saturn's upper atmosphere through mathematical inversion.
… This results in, for the first time, the number density distributions of the 5 major hydrocarbons over an altitude range from 1030 km to 630 km. The synthetic transmission curves based on these inverted distributions exhibit excellent agreement with the observed transmission curves in all usable …
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Computational phase imaging based on intensity transport
… used for visualization of biological samples, density distributions and surface profiles. This thesis develops new methods for imaging phase and amplitude from multi-dimensional intensity measurements. Tomographic phase imaging of diffusion distributions is described for the application of …
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Velocity fluctuations in slow flow through porous media
… long-tailed, non-Gaussian velocity probability density distributions. A main result of our simulations is that the statistics of the flow through a single channel captures the entire flow, insofar as the patterns and probability distributions are concerned. I have constructed a simplified, …
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