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 27 for “"model parameterization"”.
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Systematic Tire Testing and Model Parameterization for Tire Traction on Soft Soil
… the development of terramechanics and tire model parameterization method through experimental tests. The experimental tests consisted of static tire deflection tests, static tire-soil tests, soil properties tests, and dynamic tire-soil tests. The series of tests (test program) presented …
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Applications of a fast helmholtz solver in exploration seismology
Seismic imaging techniques rely on a velocity model inverted from noisy data via a non-linear inverse problem. This inferred velocity model may be inaccurate and lead to incorrect interpretations of the subsurface. In this thesis, I combine a fast Helmholtz solver, the field expansion method, with …
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Tomographic velocity model building in high-fidelity seismic depth imaging of near surface and VSP settings
… between the raypath distribution and the model parameterization scheme. A reasonable model parametrization is the key to successful tomography applications, especially when the ray coverage is poor and uneven. Motivated by a geologically plausible model parameterization, the multiscale …
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Geomorphic modeling and routing improvements for GIS-based watershed assessment in arid regions.
Watershed models have two significant shortcomings that limit their application to management problems in arid and semi-arid regions. The first is that the performance of event-based hydrologic models for ephemeral stream networks declines significantly as watershed size increases. The second is …
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On the economic optimality of marine reserves when fishing damages habitat
… expand a spatially-explicit bioeconomic fishery model to include the negative effects of fishing effort on habitat quality. I consider two forms of effort driven habitat damage: First, fishing effort may directly increase individual mortality rates. Second, fishing effort may increase competition …
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Detection and localization of aerosol releases from sparse sensor measurements
… is possible. Additionally, while dynamic models can be formulated in many environmental conditions, the underlying model parameters may not be precisely known. The combination of these two issues impacts the effectiveness of inference approaches. We restrict ourselves to propagation models …
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On the economic optimality of marine reserves when fishing damages habitat
… expand a spatially-explicit bioeconomic fishery model to include the negative effects of fishing effort on habitat quality. I consider two forms of effort driven habitat damage: First, fishing effort may directly increase individual mortality rates. Second, fishing effort may increase competition …
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Prognostic modelling for residual useful life prediction
… thesis studies new approaches for prognostic modelling of residualuseful life prediction using condition monitoring information.First, stochastic filtering models are applied for residual useful life prediction, andboth failure and censored data are utilized for model parameterization. Then, …
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Spatial inconsistencies influence global estimates of soil respiration: how can we improve global predictions?
… Rs as predicted by a quantile regression forest model. A model parameterized using SRDBv3 yielded a global Rs sum of 88.6 Pg C yr-1, and associated uncertainty of 29.9 (mean absolute error) and 57.9 (standard deviation) Pg C yr-1, whereas parameterization using SRDBv5 yielded 96.5 Pg C yr-1 and …
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Novel approach towards 1D resistivity inversion using the systematically-determined optimum number of layers
… inversion is important for constructing a model that represents the subsurface accurately. Current common methods to select the number of layers are performed in one of three ways: by trial-and-error and choosing the best model data-fit, by using the modified F-test, or through …
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Spatial modeling and visualization of habitat response to hydrologic restoration in New England salt marshes
… marsh plants and invasive species. An ecosystem model was developed to better predict salt marsh habitat response to hydrologic modification as a synthesis of existing models for biomass production, marsh elevation, tidal hydrology, and plant succession. A field experiment was conducted to …
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Structural RNA Homology Search and Alignment Using Covariance Models
… homologous RNAs and comparing them. Covariance models: CMs) are powerful computational tools for homology search and alignment that score both the conserved sequence and secondary structure of an RNA family. However, due to the high computational complexity of their search and alignment …
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Evaluation of climate change impacts on the hydrologic response of a sparsely-monitored basin in Sardinia, Italy, through distributed hydrologic simulations and hydrometeorological downscaling
… are heavily influenced by climate variability. Modeling these watersheds is difficult due to the complex nature of the hydrologic response as well as the sparseness of hydrometeorological observations. In this work, we first present a strategy to calibrate a distributed hydrologic model, known …
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Understanding community changes in ecological systems: a probabilistic and geometric perspective
… rooted in the generalized Lotka-Volterra model, adopts a probabilistic and geometric perspective to understand these dynamics. In particular, my thesis comprises three core projects. The first project develops probabilistic system-level measures to quantify the effects of third-party …
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The tectonics and three-dimensional structure of spreading centers--microearthquake studies and tomographic inversions
… that the theoretical results are independent of model parameterization. An important aspect of this review is the demonstration that travel time anomalies due to path and source effects are nearly independent. The discussion of the simultaneous inverse technique examines theoretically the …
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Characterizing uncertainty for regional carbon cycle modeling
… global inversions) and bottom-up (eg. process modeling, inventories) approaches. The research presented in this dissertation addresses some of the key aspects of model-data fusion that will be important within the framework of continental scaling efforts such as the North American Carbon …
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Productivity, physiology, community dynamics, and ecological impacts of a grassland agro-ecosystem: integrating field studies and ecosystem modeling
… ecosystems by combining field studies and modeling techniques. In an agriculture context, primary productivity is especially important. Therefore, the first part of my research addresses the optimal harvesting time of prairie biomass to achieve the maximum yield within one production cycle. …
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Modeling the Dissolution of Immiscible Contaminants in Groundwater for Decision Support
… remediation strategies, but quantitative modeling efforts are inherently subject to multiple uncertainties. These include unknown residual amounts of non-aqueous phase liquids (NAPL) and source zone dimensions, inconsistent historical monitoring of contaminant mass discharge, and the …
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Multiresolution spherical wavelet analysis in global seismic tomography
… structure of deep Earth's interiors. Tomographic models obtained at the global and regional scales are an underlying tool for determination of geodynamical state of the Earth, showing evident correlation with other geophysical and geological characteristics. The global tomographic images of the …
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