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 45 for “"spectral signatures"”.
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Using spectral signatures as a toolbox for determining crop health status
Spectral based techniques allow for rapid, non-invasive probing of plant and crop performance, and have potential to overcome current phenotyping bottlenecks for breeders and researchers while enabling farmers to optimise the inputs of fertilizer, irrigation and pesticides on their crops to …
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A review of optical diagnostic techniques used to identify uranium spectral signatures
Spectroscopic detection of signatures produced by Nuclear Weapons of Mass Destruction (NWMD) is essential for maintaining national security and countering nuclear proliferation. Through non-invasive measurement techniques it is possible to remotely monitor an area and confirm or deny the use of …
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Spectral signatures of Alzheimer’s disease: Transformer-based analysis of speech patterns toward explainable detection and monitoring
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Identification of Molecules by Spectral Imaging
<p>Spectral imaging is a powerful technique which uses the wavelength to identify/quantify the exact location and amount of the molecules. It facilitates the identification of materials and studying their properties through analyzing the way they interact with light. The study of light interaction …
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DETERMINING THE QUALITY OF PASTEURISED AND HOMOGENISED COW MILK USING MICROWAVE SENSORS
… property tests were conducted to produce unique spectral signatures for three mainly consumed categories of fresh milk; whole milk, semi-skimmed milk and skimmed milk bought from a supermarket over a period of a week, which served to build a reference database. Based on these spectral signatures …
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Assessing The Biophysical Naturalness Of Grassland In Eastern North Dakota With Hyperspectral Imagery
… areas dominated by introduced grasses using hyperspectral imagery.</p> <p>Hyperspectral imageries from the Hyperion sensor on EO-1 were acquired in late spring and late summer on 2009 and 2010. Field spectra for widely distributed species as well as smooth brome grass and Kentucky blue grass were …
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Evaluating the suitability of UAV data for mapping dominant plant species in a heterogenous fynbos seep wetland
… has not been explored. This study used multispectral UAV photography from Parrot Sequoia and Micasense RedEdge- M multispectral cameras to discriminate eleven wetland Fynbos plant species in a seep wetland located in the Steenbras Nature Reserve in the Western Cape province of South Africa. …
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Application of Machine Learning and Hyperspectral Imaging in Plant Phenomics Research
… architecture traits and better yield. We used spectral signatures of different edamame at several harvesting time along with machine learning methods to identify the optimal harvest time of edamame. Hyperspectral imaging (a technique that analyzes a wide spectrum of light instead of just …
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Exoplanet Atmospheric Characterization using High-Precision Photometry
… The main focus of my thesis is the study of spectral signatures in Photometric observations of exoplanets both in optical and near-IR. This thesis includes a number of investigations on the capability of present and future space-based telescopes in studying and characterizing exoplanet …
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Spectral characterization of desert surfaces in Kuwait by satellite data
… a study was necessary to characterize their spectral signatures as detected by Landsat Thematic Mapper (TM) data. A sophisticated image analysis was applied to the Landsat TM scene. An unsupervised classification technique produced a thematic map of the area. Data was collected on the ground …
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Coherence characterization with a superconducting flux qubit through NMR approaches
… scheme and data processing result in an improved spectral range and signal visibility over conventional methods. The observed power law dependence below kilohertz agrees with separate measurements at higher frequencies. Also, the noise is found to be temperature independent. Finally, a robust …
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Using Spectral Analysis to Evaluate Flute Tone Quality
… digital signal processing techniques to produce "spectral signatures". The signatures consist of the harmonic content, pitch, and amplitude of a sample. In the future, with further development, HAT may be a useful tool for musicians for tone development in the practice room.</p> <p>The outcome of …
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Terahertz imaging and quantum cascade laser based devices
… These features, combined with the unique THz spectral signatures of chemicals have lead to the development of terahertz imaging systems for non-destructive test. However, the weak radiation sources in these existing systems result in single pixel scanning architectures requiring minutes to …
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Tissue spectroscopic characterization based on fluorescence, second harmonic generation, and reflected light
… tissue structure and function: two-photon spectral resolved imaging, tri-modal imaging, and interferometric second harmonic imaging. First, two-photon spectral resolved microscopy utilizes the 3D localization ability of two-photon excitation to extract spectroscopic information from a …
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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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Biodiversity and dynamics of direction finding accuracy in bat biosonar
… the direction of incoming sounds based on spectral signatures. The present study in its first part has investigated how well bat biosonar beampatterns are suited for direction finding using a measure of the smallest estimator variance that is possible for a given direction (Cram{'e}r-Rao …
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Tunable Linear and Nonlinear Metasurfaces Based on Hybrid Gold-Graphene Plasmons
… the polarization state, beam steering, lensing, spectral filtering, and holography, to name a few. Metasurfaces can also facilitate nonlinear optical effects, such as the mixing of beams at different frequencies to generate a beam at a new frequency.</p> <p>The ability to alter the behavior of a …
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Breast cancer diagnosis using Fourier transform infrared imaging and statistical learning
… metrics both for epithelial and stromal disease signatures. In my dissertation work, I focused on building combinatorial approaches using chemical imaging, histopathology images, machine learning and deep learning. An emerging area of investigation is using spectrometry to perform tissue analysis …
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Chip-based photonic sensors for metrology and applications
… membrane-in-the-middle work. In addition, the spectral signatures of the system allow more detailed study of the losses than is possible in a simple cavity, and we quantify the reflection, transmission, absorption and scattering losses in the context of a simple model. We use the …
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Spectral analysis of total suspended solids mixtures for solids composition determination
… filter. The captured mixtures of solids were spectrally scanned using a digital spectrophotometer for determination of reflectance intensities at numerous wavelengths within the visible light range. Significant differences between the visible spectral reflectance data in three-constituent and …
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