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 38 for “"imaging spectroscopy"”.
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Molecular Electronic Structure via Photoelectron Imaging Spectroscopy
… dissertation explores the use of photoelectron imaging spectrometry to probe the molecular electronic structure of various chemical systems, with an emphasis on photoelectron angular distributions. Experimental ion generation, mass selection, laser photodetachment, and photoelectron ion imaging …
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Methodological developments for mapping soil constituents using imaging spectroscopy
… Optical remote sensing and in particular Imaging Spectroscopy has shown the potential to quantify land surface parameters over large areas, which is accomplished by taking advantage of the characteristic interactions of incident radiation and the physico-chemical properties of a material. …
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Applications of Imaging Spectroscopy in Forest Ecosystems at Multiple Scales
… land use. Thus, this work evaluates the use of imaging spectroscopy to monitor forest nutrient status, species diversity, and plant invasions in the Mid-Atlantic region. The research is divided into four separate studies, each of which evaluated a unique application for imaging spectroscopy data …
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Photodetachment Studies of Atomic Negative Ions Through Velocity-Map Imaging Spectroscopy
The technique of velocity-map imaging (VMI) spectroscopy as been adapted to a keV-level negative ion beamline for studies of photon-negative ion collisions. The design and operation of the VMI spectrometer takes into consideration the use of continuous, fast-moving (5 keV to 10 keV) ion beams, as …
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Exploring the Chemistry of Methoxide with Oxygen through Photoelectron Imaging Spectroscopy
In this dissertation, photoelectron imaging spectroscopy is employed to probe the gas-phase chemistry between methoxide (CH3O) and oxygen, including evidence of previously unexplored reaction paths and providing further insight into the fundamentals of chemical bonding. First, the known reaction …
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Imaging spectroscopy and combinatorial mutagenesis of light harvesting II antenna from Rhodobacter capsulatus
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
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Experimental study of plasma transport using X-ray imaging spectroscopy in Alcator C-Mod
The high resolution X-ray spectrometer with spatial resolution (HiReX-Sr) is intensively used in the studies of impurity, momentum and energy transport in Alcator C-Mod. This thesis investigates three phenomena using HiReX-Sr: (1) Non-local heat transport (the breakdown of a local expression for …
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Prediction of Foliar Biochemistry in a Boreal Forest Canopy Using Imaging Spectroscopy and LiDAR Data
… trembling aspen was investigated. Specifically, imaging spectroscopy (IS) and light detection and ranging (LiDAR) are used to model the foliar N:P ratio, macronutrients (N, P, K, Ca, Mg) and chlorophyll. Measurement of both foliar macronutrients and foliar chlorophyll provide critical information …
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Multi-Scale Mapping of Diagenetic Processes in Sandstones Using Imaging Spectroscopy: A Case Study of the Frontier Formation (Wyoming, U.S.A.) and the Utrillas Formation (Burgos, Spain)
Imaging spectroscopy is applied to two sandstone formations to study diagenetic processes in sedimentary deposits. Spectral data from hand specimens and cores were acquired and compared with close-range hyperspectral imaging to analyze lateral and vertical geochemical variations and quantify facies …
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Combustion Studies of Laminate Propellants of AP and HTPB With UV/IR Imaging and Spectroscopic Diagnostics
A non-intrusive diagnostic technique of imaging spectroscopy has been developed and used to study vibrational-rotational transitions of HCl in order to measure associated temperatures at different locations in the gas phase and to test for thermal equilibrium. Experimental spectra have been …
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Data driven estimation of soil and vegetation attributes using airborne remote sensing
Airborne remote sensing using imaging spectroscopy and LiDAR (Light Detection and Ranging) measurements enable us to quantify ecosystem and land surface attributes. In this study we use high resolution airborne remote sensing to characterize soil attributes and the structure of vegetation canopy. …
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White mica: spectrometer design, district-scale mapping, and integration of imaging spectrometer and lidar data
Imaging spectroscopy, which applies the principles of reflectance spectroscopy to an image on a pixel-by-pixel basis, has been utilized for decades in a wide variety of fields, providing information regarding the chemical composition of materials measured. This information has allowed researchers …
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Nano-Silicon/graphene Composite Anodes For Enhanced Performance Lithium Ion Batteries
… conversion active material in the form of SiNx. Imaging, spectroscopy and electrochemical characterizations are highlighted. These strategies contribute to the elucidation of the underlying electrochemical mechanisms pertaining to the N-doping effect, Si alloying and conversion reactions. With …
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THz imaging and microscopy, a multiplexed near-field TeraHertz microscope
None of the THz imaging techniques developed to date, permits high spatial resolution spectroscopic imaging at fast acquisition rates. In the classical THz sub-wavelength imaging with a single aperture, the image is composed by mechanically scanning the sample against a single sub-wavelength …
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Quantum interference with undetected photons for sensing and imaging
… of applications, particularly in fields such as imaging, spectroscopy, and optical coherence tomography, among others. This thesis describes experiments for imaging and sensing based on undetected photons, both in a free-space optical setup and in an integrated photonic circuit. The free-space …
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Theory of terahertz intervalence band polaritons and antipolaritons.
… great importance in applications such as THz imaging, spectroscopy as well as in security control for detection of biological and hazardous materials and medical diagnosis. The coupling of THz radiation with intersubband transitions in semiconductor microcavities can lead to further tunability …
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Weak lensing flexion as a probe of galaxy cluster substructure
… in two ways. With a combination of optical imaging, spectroscopy, and X-ray observations I determine that the cluster RCS043938-2904.7, while apparently anomalous initially due to its high optical richness and low X-ray surface brightness, is in fact an association of structures along the …
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