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 66 for “"inverse modeling"”.
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Combustion Physics and Inverse Modeling of Energetic Materials
… not been fully resolved. This lack of breath in modeling techniques and experimental characterization has prevented quantitative analysis of combustion wave dynamics for energetic materials. This thesis aims to establish theories for combustion waves in energetic materials by correlating their …
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Forward and Inverse Modeling of Tsunami Sediment Transport
… both tsunami frequency and magnitude. Numerical modeling of sediment transport during a tsunami is important interdisciplinary research to estimate the frequency and magnitude of past events and quantitative prediction of future events. The goal of this dissertation is to develop robust, …
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An Interactive Multi-Objective Framework for Groundwater Inverse Modeling
These approaches are developed and tested on a hypothetical groundwater aquifer as well as a field-scale application based on the waste isolation pilot plant (WIPP) site.
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Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling
… new data, an extensive data compilation, and inverse modeling. First, based on a sediment core that is absolutely dated from wooden remains, I argue that the deglacial 14C reservoir age of the upper East Equatorial Pacific was not very different from today. Combined with stable carbon isotope …
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Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling
… new data, an extensive data compilation, and inverse modeling. First, based on a sediment core that is absolutely dated from wooden remains, I argue that the deglacial ¹⁴C reservoir age of the upper East Equatorial Pacific was not very different from today. Combined with stable carbon isotope …
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An inverse modeling approach to investigate deep ocean ventilation from radiocarbon records
The goal of this project is to investigate the relationship between paleoceanographic radiocarbon records and the ventilation history of deep oceanic basins during the last 40 kyrs. Deep ocean ventilation changes, especially changes in Atlantic meridional overturning circulation (AMOC), are often …
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Adjoint Methods and Inverse Modeling for Process Variation Analysis in Silicon Photonics
… but are still limited. A general problem in both modeling the impact of variations and extraction from measurement is the cost of time, either the computational cost from simulation, or the cycle length of fabrication process. Therefore, here we explore some of the powerful tools that can shorten …
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A new inverse-modeling-based technique for sub-100-nm MOSFET characterization
… a solution to this problem by developing an inverse modeling- based 20 doping profile characterization technique using subthreshold 1-V characteristics that (1) does not require special test structures, (2) is able to extract 20 doping profiles of devices with very short channel-lengths, (3) …
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Crustal deformation source monitoring using advanced InSAR time series and time dependent inverse modeling
… at Hawaii, which allows time dependent source modeling. Conventional source modeling methods usually deal with static deformation field, while retrieving the dynamics of the source requires more sophisticated time dependent optimization approaches. This problem I address by combining Monte …
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Comprehensive inverse modeling for the study of carrier transport models in sub-50nm MOSFETs
… This research develops a comprehensive indirect inverse modeling technique for extracting 2-D device topology using combined log(I)-V and C-V data. An optimization loop minimizes the error between a broad range of simulated and measured electrical characteristics by adjusting parameterized …
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Deep Learning and Phase Retrieval for Chemical Holographic Imaging: System Inverse Modeling and Sample Property Prediction
… on the DFIR imaging technique. Different forward modeling strategies are discussed, such as forward models for layered homogeneous samples and spherical heterogeneous samples. Potential inverse models for CHIS are also explored using iterative optimization methods to solve for the inverse …
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Quantifying high-resolution hydrologic parameters at the basin scale using InSAR and inverse modeling, Las Vegas Valley, NV
… to determine and develop optimal strategies for inversely calibrating transmissivities (T), elastic and inelastic skeletal storage coefficients (Ske and Skv) of the developed-zone aquifer and conductance (CR) of the basin-fill faults for the entire Las Vegas basin, and to investigate future …
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Landslide kinematics and interactions studied in central Georgia by using synthetic aperture radar interferometry, optical imagery and inverse modeling
… depth and position of potential sliding planes, inverse models were developed. Inverse modeling searches for parameters of source which can create observed displacement distribution. I also empirically estimate the volume of the investigated landslide using displacement distributions as derived …
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Quantifying emissions of carbon dioxide and methane in central and eastern Africa through high frequency measurements and inverse modeling
Carbon dioxide (CO2) and methane (CH 4) are the main greenhouse gases, contributing about 81% of the total human induced radiative forcing. Sufficient observations exist to quantify the global budget of carbon dioxide and methane which is necessary for calculating the resulting radiative forcing. …
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Development of a 3-dimensional chemical transport model based on observed winds and use in inverse modeling of the sources of CCl₃F
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Estimating regional nitrous oxide emissions using isotopic ratio observations and a Bayesian inverse framework
… atmospheric N₂O measured at Mace Head. Bayesian inverse modeling methods that compare N₂O mole fraction and isotopic ratio observations at Mace Head and at Diibendorf, Switzerland to simulated conditions produced using NAME and MOZART-4 lead to an optimized set of source-specific N₂O emissions …
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LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems
The longitudinal solute transport modeling is critical in river and stream water quality management, control, and the mitigation of hazardous riverine spills. One of the widely used "deadzone" model is the transient storage model (TSM). TSM is a significant improvement over the advection-dispersion …
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Low-Frequency Subsurface Electromagnetic Modeling
… numerical methods for subsurface electromagnetic modeling. The dissertation includes: (1) fast one-dimensional forward and inverse modeling, which are commonly used in the oil industry, (2) a fast volume integral equation method, which is used to study the electromagnetic wave propagation in …
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