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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 29 for “"Spectral signature"”.
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Spectral Signature Modification By Application Of Infrared Frequency-selective Surfaces
It is desirable to modify the spectral signature of a surface, particularly in the infrared (IR) region of the electromagnetic spectrum. To alter the surface signature in the IR, two methods are investigated: thin film application and antenna array application. The former approach is a common and …
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A Hyperspectral Imager for a Cubesat to Identify Ocean Ship Parameters
A Hyperspectral imager aboard a cubesat would be able to provide images which could be used to identify ships and determine the ship's length and breadth and heading. Depending on the size of the ship, the speed the ship is traveling can be determined as well; however the speed and size …
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Synoptic variability of a CIR-driven open-closed boundary during solar minimum
… permitted researchers to clearly distinguish the spectral signature of a corotating interaction region's (CIR) impact on the open-closed boundary (OCB) of the magnetosphere in the southern hemisphere's auroral zone. By using the PENGUIn AGOs network of ground-based magnetometers on the Antarctic …
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The oat-crown rust pathosystem: an interaction of a plant, a pathogen, and time
… adult plant, matures, and dies. The visual and spectral signature of plant stress and disease also changes as the plant grows and the disease develops. Finally, plant breeders attempt to limit the damage diseases cause by quickly improving plant populations and deploying disease resistant plant …
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Optical Spectroscopy to Determine Intermediate Combustion Product Radicals in a Hydrocarbon Fueled Rocket Engine Exhaust Plume
… and the effects of their band systems on the spectral region from 300 nm to 850 nm determined. This work shows the effect of different engine operating parameters, oxidizer-to-fuel ratio and chamber pressure, and different optical alignments, different lines-of-sight and fields-ofview, on the …
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Tailoring the angular and spectral reflectance characteristics of color-dynamic films by modifying their photonic texture and topcoat roughness
… Texture of the photonic structure affects the spectral signature and angular distribution of reflected light. Surface roughness of the topcoat affects the angular distribution of incident and reflected light. Fourier optics concepts are harnessed for modeling and predicting the optical …
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Design Rules for the Nucleation, Growth, and Encapsulation of Gold Nanoparticles with Applications to Cancer Imaging
… cancer imaging due to their highly specific spectral signature (Raman “fingerprint”) and propensity for passive targeting of cancerous tissues. However, the signal intensity of currently available SERS nanoparticles is insufficient for cancer imaging via passive targeting in most solid …
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Surface detection of alkaline ultramafic rocks in semi-arid and arid terrains using spectral geological techniques
Studies have been completed into the spectral response of alkaline and other ultramafic rocks from arid and semi-arid regions. To date these rocks have not been investigated spectrally in a systematic fashion using the latest field and airborne imaging spectrometers. The objective was to determine …
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Understanding Soil Carbon Signatures from Hyperspectral Reflectance Data using Spectral Unmixing
… Moreover, the recent advancement of hyperspectral imagers has significantly increased spectral resolution, allowing more granular information to be captured. These devices offer a potentially more accurate methodology to quantify and monitor soil properties globally. Nevertheless, there is …
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Hyper-Spectral Sensor Calibration Extrapolated from Multi-Spectral Measurements
Hyper-spectral (HS) sensors are the instruments of choice for remote sensing applications involving environmental monitoring, littoral survey, and military assessment. Accurate band-to-band sensor radiometric calibration is critical for successful data mining of such HS spectral sets. Current …
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Étude de l'adsorption du HF à la surface de la glace
… infrared spectroscopy (FTIR), we identified the spectral signature of HF upon its adsorption and its dissolution in ice. The IR spectra obtained in these experiments were compared with spectra from neat ASW films having the same thickness. A strong continuous absorbance in the 1000-3275 cm-1 …
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DIGITAL IMAGE PROCESSING OF LANDSAT IMAGERY
… in detail. Based on the characteristics of spectral signature, a Band Differential micthod is proposed and implemented as a means to complement the Band Ratio method. Coputer software has been developed as as aid to the analysis of pixel clustering and distribution for Band Ratio and Band …
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ENHANCEMENT OF A CANOPY REFLECTANCE MODEL FOR UNDERSTANDING THE SPECULAR AND SPECTRAL EFFECTS OF AN AQUATIC BACKGROUND IN AN INUNDATED TIDAL MARSH
… presence of water produces unique specular and spectral characteristics in an inundated tidal marsh canopy. The aquatic substrate can affect conventional attempts to retrieve canopy characteristics, such as structure information (e.g., canopy height, leaf area index, etc.) or plant species …
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Photoinduced Dynamics Studied using Single-Shot Optical and Terahertz Spectroscopy
… of caged-contact pairs. We identify a clear spectral signature of this caged species and assign a binding energy to this species. Lastly, we observe the real-time formation of a persistent hidden quantum (H) phase in the charge density wave material 1T-TaS2. We demonstrate that the formation …
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Bias Reduction in Machine Learning Classifiers for Spatiotemporal Analysis of Coral Reefs using Remote Sensing Images
… the generalized conditions and how unique the spectral signature of coral is as environmental conditions vary across observation sites. A methodology for validating the generalization performance of a classifier to unseen locations is proposed and implemented (Controlled Parameter …
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The Co-Volcanic Ionospheric Disturbances at Mt.Etna, Italy
… (CVIDs) and they represent a key observational signature of the coupling processes between lithosphere, atmosphere and ionosphere. Based on the GNSS-TEC application, the coupling processes between lithosphere and ionosphere have been studied into regional scale at Mt. Etna (Italy). Leveraging a …
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Investigation of an integrated regional environmental watershed methodology
… transformed by the Fourier operator and a unique spectral signature of the stream obtained. It is further asserted that the national network of stream gages can be a useful source of data for this construct. Included in the research is an investigation of the framework needed to package the …
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Using Leaf Spectra to Elucidate the Taxonomy and Ecology of Living and Dried Plants
… and management of nature. The shortwave spectral reflectance of leaves is a promising tool for rapidly identifying species at different taxonomic ranks and predicting important plant functional traits. However, the spectral reflectance of leaves changes in response to biotic and abiotic …
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Advanced Methods for Change Detection in LiDAR Data and Hyperspectral Images
… capable of acquiring data with high spatial and spectral resolution have been developed. Light Detection And Ranging (LiDAR) and Hyperspectral (HS) sensors acquire data that accurately characterize the 3-D structure and the spectral signature of the area of interest, respectively. With the …
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