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 54 for “"density variations"”.
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Density variations in the lower thermosphere.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1974.
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Density Model Corrections Derived from Orbit Data to Characterize Upper Atmospheric Density Variations
One goal of this research is to estimate density model corrections using readily available Satellite Laser Ranging (SLR) data, and to demonstrate this approach's validity for additional satellites with similar data sets in the future. The research also aims to utilize previously unused or little …
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Hydrologic significance of stand density variations in Alberta lodgepole pine (Pinus contorta Dougl. (Moench) Voss. var. latifolia Engelm.) forests
… the hydrologic significance (if any) of variations in stand density, studies of snow accumulation, canopy interception of rainfall, and soil moisture, were undertaken in natural and previously thinned stands of lodgepole pine in west central Alberta. Secondary objectives dealt with …
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Link State Relationships under Incident Conditions: Using a CTM-based Dynamic Traffic Assignment Model
… the link states, reflected by flows and density over time, is essential to incident management. This thesis presents a user equilibrium Dynamic Traffic Assignment (DTA) model that incorporates the Cell Transmission Model (CTM) to evaluate the temporal variation of flow and density over …
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Holocene environmental change in the Scottish Highlands: multi-proxy evidence from blanket peats
… reference to the evidence for pine woodland density variations and tree-line dynamics. The evidence is derived from the biostratigraphy of of peat profiles sampled along altitudinal transects in the two upland areas of Gleann Einich in the Cairngorms (between c.500m OD and 930m OD) and Beinn …
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Osteoarthritis Induced Glenoid Morphology and Bone Quality: An Evaluation of Augmented Glenoid Components
… of the glenoid results in regional bone density variations and bone loss that may compromise early component fixation and support. The two common morphologies, symmetric and asymmetric erosion, were characterized by bone density and morphology, and assessed on the basis of bone removal …
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Medical image enhancement
… of the corresponding details. The stronger image density variations make a major contribution to the overall dynamic range, and have large coefficient values. These values can be reduced without much information loss.
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Fastener withdrawal resistance of wood-based composite panel products
… accomplish this, investigation of the in-plane density variations of currently available panel products was performed, as was an investigation of the relationship between panel density and the fastener holding capacity of different panel materials. In addition, a comparison of the fastener …
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A multiplier phototube thickness indicator
… moving web of paper. The absolute effect of the density variations of any of the particular types of tissue tested on those measurements has not been fully determined as yet, but it is believed that if a given type of tissue is used the density of variations of the paper can be neglected or …
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Density structures in the Jovian magnetosphere
… et al. (1992) by identifying and examining density structures in Jupiter's magnetosphere. The 110 hours of data used are from a 4-second temporal resolution density data set derived from plasma wave instruments on board both Voyager 1 and Voyager 2. One hundred five structures are …
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A 3-D Model of the Auroral Ionosphere
… waves in generating local dynamo currents and density variations. Results of this model also shed some light on the interplay of perpendicular and parallel transports of plasma in producing structures in density and drift velocity profiles.</p>
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The role of background flow variations in stratified flows over topography
As the atmosphere and oceans feature density variations with depth, the flow of a density-stratified fluid over topography is central to various geophysical and meteorological applications and has been studied extensively. For reasons of convenience and mathematical tractability, the majority of …
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Thermal and mechanical development of the East African Rift System
… East African plateau can be explained by density variations within the upper mantle that are dynamically maintained.
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Thermal and mechanical development of the East African Rift System
… East African plateau can be explained by density variations within the upper mantle that are dynamically maintained.
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A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows
… adopted herein can readily accommodate large density variations and thermo-acoustic phenomena. A preconditioned multigrid algorithm is used to obtain the solution on highly stretched meshes in a more efficient manner. A flexible block-based hierarchical data structure is used to maintain the …
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Identification of Data Structure with Machine Learning: From Fisher to Bayesian networks
… structure of a dataset in terms of a) metric, b) density and c) feature associations. To look into the first aspect, Fisher's metric learning algorithms are the foundations of a novel manifold based on the information and complexity of a classification model. When looking at the density aspect, …
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Modeling engine oil vaporization and transport of the oil vapor in the piston ring pack on internal combustion engines
… a set of equations governing the oil vapor density variations were derived by applying the mass conservation law to the amount of oil vaporized from the piston and the amount of oil vapor transported within the piston ring pack. The model was applied to a heavy-duty diesel engine. First, the …
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Studying the southerly eclipsing millisecond pulsar J1748-2446A using MeerKAT
… magnetised plasma, with electron densities and density variations much higher than the typical interstellar medium. Furthermore, we investigated the effects of strong lensing induced by this material and discovered ten magnified single pulses with a “signal-to-noise"ratio, SNR > 10.
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Proterozoic structures in north-central North Dakota: a gravity study
… The contribution of the Phanerozoic overburden (density assumed to be 2 . 48 g cm- 3 ) to the gravity signal, was removed, leaving residual gravity anomalies due to density variations in the Precambrian basement. Four east-west gravity profiles were constructed and modeled with a two dimensional …
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