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Showing 1 to 20 of 54 for “"Reflectance Spectra"”.
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Reflectance spectra of the Galilean satellites of Jupiter
Thesis: B.S., Massachusetts Institute of Technology, Department of Physics, 1994
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Optical reflectance spectra of chromium (III) in MgO-ss
… sites in the MgO lattice by the use of optical reflectance spectroscopy. The effect of the concentration of the chromium ion on the crystal field splitting energy, 10 Dq, permitted analysis over a range of Dq/B values. In conjunction, MgO-ss lattice parameters examined as a function of chromium …
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Application of chemometric analysis to UV-visible and diffuse near-infrared reflectance spectra.
… well as classification studies were conducted on spectral data obtained with chili peppers and fabrics samples. Multivariate regression models known as partial least squares (PLS-1) were developed from the spectral data of alcoholic extracts of Habanero peppers. The developed regression models …
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Seasonal trends in separability of leaf reflectance spectra for Ailanthus altissima and four other tree species
This project investigated the spectral separability of the invasive species Ailanthus altissima, commonly called tree of heaven, and four other native species. Leaves were collected from Ailanthus and four native tree species from May 13 through August 24, 2008, and spectral reflectance factor …
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USING AIRBORNE HYPERSPECTRAL IMAGERY TO ESTIMATE CHLOROPHYLL A AND PHYCOCYANIN IN THREE CENTRAL INDIANA MESOTROPHIC TO EUTROPHIC RESERVOIRS
… phycocyanin) from remotely sensed imagery. Hyperspectral airborne and hand-held reflectance spectra were acquired on three reservoirs (Geist, Morse and Eagle Creek) in Central Indiana, USA. Concurrent with the reflectance acquisition, in situ samples were collected and analyzed in laboratories to …
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Active hyperspectral imaging of chemicals on surfaces
Active hyperspectral imaging (HSI) is a promising technique for the detection of chemicals at standoff distances. In active HSI, a target is illuminated by a laser source at many different wavelengths and a camera obtains an image of the illuminated scene at each wavelength. In this research, the …
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Assessment of anthropocentric representations of color patterns for biological relevance
… visual system properties (number of cone cells, spectral sensitivities of cone cells, filtering properties of ocular media, etc.) and thus may perceive and respond to stimuli differently than we do. These observations have led some to propose that human vision and the anthropocentric expressions …
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Revealing Refractory Materials on Trans-Neptunian Objects and Centaurs via Reflectance Spectroscopy
… runs at the ESOVery Large Telescope. The reflectance spectra of these minor planets were investigated to determine whether silicates and refractory organics, which are predicted to be present on their surfaces, could be directly detected via the presence of their characteristic absorption …
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The role of fruit colour in avian fruit selection: an objective approach
… the following hypotheses were addressed, using reflectance spectra of fruits as colour assessment: 1. Birds prefer red and black fruits, or these hues are cues for food recognition in migrants or fledglings. 2. Fruit colours correlate with chemical compounds. 3. Fruit colours serve as …
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Observational constraints on the number, albedos, size, and impact hazards of the near-Earth asteroids
… (NEAs) in terms of number, orbital parameters, reflectance spectra, albedos, diameters, and terrestrial and lunar collision rates. I estimate the size and shape of the NEA population using survey data from the Lincoln Near-Earth Asteroid Research project including more than 1300 NEA detections. …
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Chemical and Physical Characterization of Pre- and Post-Fire Soils for Wildfires in the Western US and Laboratory Burns
… connections between Soil Water Repellency (SWR), reflectance spectra, and chemistry. During this study, ash and soil samples were collected after three megafires including Dixie, Beckwourth Complex, and Caldor. In addition, several field- and laboratory-based experiments were conducted on common …
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HYPERSPECTRAL REMOTE SENSING FOR ADVANCED DETECTION OF EARLY BLIGHT (ALTERNARIA SOLANI) DISEASE IN POTATO (SOLANUM TUBEROSUM) PLANTS
… in potato (Solanum tuberosum) plants using hyperspectral remote sensing data captured with a handheld spectroradiometer. Hyperspectral reflectance spectra were captured 10 times over five weeks from plants grown to the vegetative and tuber bulking growth stages. The spectra were analyzed using …
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Bio-Optical Properties of the Arctic Waters: Empirical and Theoretical Observations
… and attenuation all show strong first-order spectral relationships. Two semianalytical remote sensing reflectance models were evaluated and validated using bio-optical data collected in this region. Both models were proficient at retrieving chlorophyll concentration, phytoplankton absorption …
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Using satellite hyperspectral imagery to map soil organic matter, total nitrogen and total phosphorus
… study aimed at examining the capacity of hyperspectral reflectance data for mapping soil organic matter (SOM), total nitrogen (N) and total phosphorus (P). Soil samples collected from Eagle Creek Watershed, Cicero Creek Watershed, and Fall Creek Watershed were analyzed for organic matter …
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Effects of Earth encounters on the physical properties of near-earth objects
… have examined the effects of these encounters on reflectance spectra based on observational measurements, and effects such as spin state and shape changes have been studied for specific asteroids and through simulation. In this project, an automated light-curve fitting routine was developed to …
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Diffuse reflectance spectroscopy of human colon tissue
Diffuse reflectance spectroscopy can provide quantitative biochemical and morphological information for the analysis of biological tissue epithelium and the detection of precancerous lesions. To investigate this, diffuse reflectance spectra were collected from adenomatous colon polyps (cancer …
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Multispectral classification and reflectance of glaciers: in situ data collection, satellite data algorithm development, and application in Iceland & Svalbard
… water resources and local biodiversity. Multispectral (visible and near-infrared) remote sensing has been used for studying GIC and their changing characteristics for several decades. Glacier surfaces can be classified into a range of facies, or zones, which can be used as proxies for annual …
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On-line cure characteristics of organic strip steel coatings by infrared spectroscopy
Specular reflectance infrared spectroscopy is investigated as a potential on-line technique to measure the cure state of an organic polymer on steel strip. White internal polyester, deep red external polyester and pale brown plastisol coatings are studied.<br/><br/>The Fourier transform infrared …
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NATURAL ANALOGUES OF PLANET MERCURY’S SURFACE: MINERALOGICAL AND SPECTROSCOPIC ASPECTS
… However, the interpretation of Mercury’s spectral properties remains complex due to the effects of space weathering (SpWe) and extreme temperature variations affecting the surface. Since it is not possible to have direct information on the surface, from meteorites from Mercury nor from …
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Complexos luminescentes de íons lantanídeos trivalentes ligados covalentemente à superfície da sílica gel.
… of the silica gel functionalization process. IR spectra showed the main characteristic bands of the functional groups of aminosilane 3N and the ligand DTPA. After the adsorption of the lanthanide and the diketonate ligands, the new hybrid materials exhibited characteristic luminescence emission …
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