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 32 for “"diffuse reflectance spectroscopy"”.
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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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Intra-operative Assessment of Breast Tumor Margins Using Diffuse Reflectance Spectroscopy
… both the surgeon and pathologist. Quantitative diffuse reflectance (DR) spectral imaging has been shown to be a promising tool for interrogating tumor margins but patient and surgical factors have to be accounted for in order to fully exploit the discriminatory capability of the technology. The …
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Exploiting Optical Contrasts for Cervical Precancer Diagnosis via Diffuse Reflectance Spectroscopy
… sensor capable of collecting reliable diffuse reflectance data to extract quantitative optical contrasts for cervical cancer screening and diagnosis. </p><p> A scalable Monte Carlo based optical toolbox can be used to extract absorption and scattering contrasts from diffuse reflectance …
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Rapid identification of oil contaminated soils using visible near infrared diffuse reflectance spectroscopy
… and scanned using visible near-infrared diffuse reflectance spectroscopy (VisNIR DRS) at three combinations of moisture content and pretreatment. The VisNIR spectra of soil samples were used to predict total petroleum hydrocarbon (TPH) content using partial least squares (PLS) regression …
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Raman spectroscopy and diffuse reflectance spectroscopy for diagnosis of human cancer and acanthosis nigricans
… there has been much interest in using Raman spectroscopy and diffuse reflectance spectroscopy as analytical optical spectroscopic methods for early diagnosis of diseases. Raman spectroscopy can be used to measure changes in the bio-molecular composition of a tissue specimen, and diffuse …
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Sensitivity of Diffuse Reflectance Spectroscopy to Dose- and Depth-dependent Changes in Tumor Oxygenation after Radiation Therapy
… for radiotherapy efficiency. We hypothesize that diffuse reflectance spectroscopy (DRS) enabling repeated non-invasive measurements of tumor vascular oxygen saturation can provide surrogate measures of tumor oxygenation to predict tumor response to therapy. The goal of this study is to determine …
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The Effects of Metronomic and Maximum-Tolerated Dose Chemotherapy in Colorectal Cancer Angiogenesis: A Combined Approach Using Endoscopic Diffuse Reflectance Spectroscopy and mRNA Expression
… optics and molecular biology approach (using diffuse reflectance spectroscopy and mRNA expression) to study the changes in angiogenesis and metabolism in primary colorectal tumors receiving MTD and MET. In Chapter 2, we first developed and validated a miniaturized spectroscopy probe that …
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ΜΕΛΕΤΗ ΤΗΣ ΔΙΑΣΠΑΣΕΩΣ ΤΗΣ ΠΡΟΠΑΝΟΛΗΣ-2 ΣΕ ΑΠΛΟΥΣ ΚΑΙ ΜΕΙΚΤΟΥΣ ΚΑΤΑΛΥΤΕΣ ΕΠΙ ΦΟΡΕΟΣ SILICA
… OF THE SPECIMENS INVOLVED DIFFUSE REFLECTANCE SPECTROSCOPY MEASUREMENTS, X-RAY POWDER ANALYSIS AND CLASSICAL ANALYSIS. THE DECOMPOSITION OF PROPANOL-2 WAS USED AS PROBE REACTION AND THE FRACTIONAL CONVERSION AND RELATIVE YIELD WERE DETERMINED AT VARIOUS TEMPERATURES IN A …
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Element substituted aluminophosphates
… its unit cell volume relative to AlPO₄-5, and by diffuse reflectance spectroscopy. CoAPO-5 also contains an appreciable quantity of extra-framework cobalt occluded in the pores, and/or as balancing cations. Evidence for this was obtained from ion exchange, and from oxygen and argon adsorption. …
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Development of Multi-Modality Imaging Cart for Barrett’s Esophagus
… imaging system combining autofluorescence spectroscopy, optical coherence tomography, and diffuse reflectance spectroscopy to perform label-free optical biopsies on ex-vivo tissue. These images will be co-registered and validated with histological biomarkers for BE. The ultimate goal is to …
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Synthesis and properties of nanoparticulate titanium dioxide compounds
… by elemental analysis, X-ray photoelectron spectroscopy (XPS) and Rutherford back scattering (RBS). The effect of nonmetal doping on the band gap of the TiO2 nanotubes was investigated by diffuse reflectance spectroscopy (DRS).
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Síntese e caracterização de nanoestruturas de óxido de zinco por via úmida
… 77K, X-ray diffraction (XRD), X-ray fluorescence spectroscopy (FRX) and UV-visible diffuse reflectance spectroscopy (DRS). The synthesis conditions allowed to obtain different morphologies, such as nanorods, nanoflowers, nanoplates. The XRD results of ZnO samples indicated that the synthesized ZnO …
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Understanding Radiation Resistance in Head and Neck Tumor Xenografts Using Diffuse Reflectance and Raman Spectroscopy
… linked to poor treatment outcome, we employed diffuse reflectance spectroscopy to measure vascular oxygen saturation. In chapter 2, we first investigated the sensitivity of diffuse reflectance spectroscopy to tumor hypoxia and determined that optical measurement of tumor vascular oxygen …
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Characterization of polyethylene terephthalate, cellulose acetate and their blends
… are completed through Fourior Transform Infrared-Diffuse Reflectance Spectroscopy (FTIR-DRIFT), Differential Scanning Calorimeter (DSC) and Dynamic Mechanical Analyzer (DMA). Scanning Electron Microscopy (SEM) micrographs of these blends are taken to examine their morphologies. From IGC, it is …
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Optical diagnostics for oral and gastrointestinal tract pathologies
… incorporates customized modalities of Raman and diffuse reflectance spectroscopy and proposes a multi-tiered diagnostic approach to enhance clinical decision-making. The clinical study involved the collection and analysis of saliva and in vivo tissue analysis from OPMD patients and healthy …
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Growth dynamics, charge density, and structure of polyamide thin-film composite membranes
… composite reverse osmosis membranes using diffuse reflectance spectroscopy, Rutherford backscattering spectrometry (RBS), and atomic force microscopy (AFM); (2) quantifying the effects of trimesoyl choride (TMC) and m-phenylenediamine (MPD) monomer concentrations on the polyamide charge …
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Síntese e caracterização de nanopartículas de óxidos de ferro e sua mistura com resíduos da cana-de-açúcar (bagaço e palha) para emprego nos processos de adsorção e fotocatálise heterogênea
… to the results of X-ray Diffraction and Infrared Spectroscopy with Fourier Transform. The morphological properties were determined by Scanning Electron Microscopy and Transmission Electron Microscopy, verifying the obtaining of nanoparticles with average sizes predominantly around 50 nm. The …
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Solvothermal synthesis and characterisation of novel Gallium-sulphide compounds
… properties have been studied using UV-Vis Diffuse Reflectance Spectroscopy. Ion-exchange experiments and BET surface area/pore size distribution analysis have been carried out to determine the ion-exchange capacity for the three-dimensional structure.
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Applying Mechanistic Understanding of Optical Absorption and Scattering Phenomena to Enhance the Spectroscopic Analyses of Pharmaceutical Materials
The dissertation uses spatially-resolved spectroscopy to separate absorption and scattering behaviors when NIR light interacts with pharmaceutical materials. The separated absorption and scattering were utilized to enhance mechanistic understanding of NIR diffuse reflectance spectroscopy and …
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Human skin optical properties and autofluorescence decay dynamics
… were completed in terms of macroscopic, in vivo diffuse reflectance spectroscopy, autofluorescence spectroscopy, and temporal behavior of the autofluorescence signal during continuous laser exposure, as well as microscopic in vitro fluorophore distribution and spectral differences. Several …
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