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 21 for “"Source characterization"”.
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Source characterization using linear transformations of multichannel biomagnetic recordings
… straightforward and effective extraction and characterization of the biomagnetic signal components, and the elimination of the interference. The independent component analysis has been proven as an efficient signal separation and filtering technique for fetal biomagnetic recordings. ICA has …
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Developing a disturbance source characterization technique for small satellite applications
… a framework with which to characterize candidate sources of disturbance for small satellite applications. By characterize we mean estimate disturbance source vibrational frequencies, and by candidate sources we mean sources previously determined with the ability to induce micro-vibrations. This …
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Source characterization of the October 30, 1983 Narman-Horasan earthquake
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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NAPL (Non Aqueous Phase Liquid) source characterization based on dissolved contaminant concentrations
… frequently originates from spatially distributed sources of Non-Aqueous Phase Liquids (NAPLs). Such chemicals are typically persistent sources of groundwater contamination that are difficult to characterize. This work addresses the feasibility of using dissolved concentration measurements to …
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Microseismic mapping and source characterization for hydrofracture monitoring : a full-waveform approach
… fracturing mechanisms via microsesimic source mechanism inversion. First, we develop an array-based correlation approach to improve the detection of small magnitude events with mechanisms and locations similar to a nearby template event. Second, we extend the correlation detector to the …
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Surface Acoustic Wave Nebulization as a Mass Spectrometry Ionization Source, Characterization and Application
… its low internal energy distribution. After the characterization and improvement, we combined SAWN with digital microfluidics (DMF) for sample preparation before MS detection. DMF-SAWN platform was applied to the analysis of phosphorylated protein mixture. Peptides from all three proteins of the …
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Physics-guided inference from gas emission data for source characterization and air pollution mapping
… make inferences about the state of the pollutant sources, and 3) The evolution of pollutant concentration profiles. This dissertation is divided into three parts. The first part focuses on a theoretical analysis of the uncertainties involved in leak quantification via gas imaging techniques. These …
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Substrate Specificity and Molecular Characterization of PAH-Degrading Anaerobic Enrichment Cultures Under Methanogenic Conditions
… naphthalene or phenanthrene, as a sole carbon source. Characterization of the enrichment cultures by 16S rDNA analysis revealed two unique populations, though they were initiated from the same sediment source. This study set out to determine the ability of these highly enriched communities to …
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Metallurgical characterization of self catalytic structural materials for sulfuric acid decomposition
… to their microstructural features. The goals of characterization were to determine metallurgical stability for service as self-catalytic structural materials. The results presented herein will be useful to the development of a material for the construction of a heat exchanger designed for …
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Non-destructive evaluation of laboratory scale hydraulic fracturing using acoustic emission
… fracturing experiments. Individual microcrack AE source characterization is performed to understand the failure mechanisms associated with small failures along pre-existing discontinuities and grain boundaries. Individual microcrack analysis methods include moment tensor inversion techniques to …
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Visualizing Interior And Exterior Jet Aircraft Noise
… propulsive jet engines produce exterior noise sources with a high amplitude noise field and complicated characteristics, which makes them very difficult to characterize. In particular, there are turbulent eddies that are moving through the jet at high speeds along the jet boundary. These …
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System-on-chip-based radiation imaging system with pulse shape discrimination capability
… radiation imaging systems, capable of source characterization and localization of radioactive materials for nuclear security, safeguards, and non-proliferation applications, remain an unexplored technology as several technological challenges have prevented their adoption. These systems …
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Examining the Influence of Wildlife Population and Fecal Coliform Density Variability on Virginia Bacterial TMDL Development
… using a modeling approach. These models require characterization of all residential, agricultural, and wildlife sources of bacteria. Wildlife bacteria source characterization is typically conducted with estimates of population and fecal coliform production. A sensitivity analysis was performed on …
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Mass, Composition, Source Identification and Impact Assessment for Fine and Coarse Atmospheric Particles in the Desert Southwest
… laboratory, and analyzed to provide a chemical source profile for each soil type yielding insights into unique source signatures. Observations within the chemical speciation data and subsequent modeling analysis show a strong impact from local sources at the Cowtown site where mass …
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Unraveling the fingerprints of NOx using stable isotopes: Implications for NOx source partitioning and oxidation chemistry
… be a useful tool for constraining NOx emission sources as well as for understanding the atmospheric oxidation pathways responsible for its removal if various NOx sources and sink processes exhibit characteristic isotopic compositions (“fingerprints”). However, this requires (1) an accurate and …
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Characterizing microearthquakes and shallow structure with dense array and optical fibers
Source properties of small earthquakes, such as source dimension and stress drop, help us to constrain source physics and assess seismic hazards. Small events carry information about the stress state in the subsurface. They also help us predict the behavior of larger earthquakes. However, the …
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All-semiconductor High Power Mode-locked Laser System
… application of all-optical synchronization, the characterization of advanced modulation formats using a linear optical sampling technique was studied. The full characterization of 10-Gb/s RZ-BPSK (return-to-zero binary PSK) data has been demonstrated. Fast lockup and walk-off of the all-optical …
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Energy Harvesting Networked Nodes: Measurements, Algorithms, and Prototyping
… energy harvesting networked nodes: energy source characterization, algorithm design, and node design and prototyping. Additionally, the thesis contributes to engineering education, specifically to project-based learning. We summarize our contributions to light and kinetic (motion) energy …
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Machine Learning Driven Source Identification, State Estimation and Sensor Optimization in Water Systems
… driven frameworks to tackle three problems: i) Source Identification (SI) of contaminants in sewer systems, ii) State Estimation (SE) of water quality parameters in water distribution systems, and iii) Sensor Placement Optimization (SPO) in both systems. Traditional methods proposed to address …
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