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.
Results
Showing 1 to 20 of 92 for “"Diffuse reflectance"”.
-
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 …
-
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 …
-
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 …
-
MONTE CARLO MODELING OF DIFFUSE REFLECTANCE AND RAMAN SPECTROSCOPY IN BIOMEDICAL DIAGNOSTICS
… develops the MC model as a tool for designing diffuse detection systems and expands the ability to use the MC model in Raman scattering in biological tissues.
-
Analysis of drug polymorphism by diffuse reflectance visible spectroscopy- a novel approach
… development. This was achieved here, using diffuse reflectance visible spectroscopy (DRVS) and the colour change which occurs when pH indicator dyes are deposited on the surface. The pH indicators used were phenol red (PR), thymol blue (TB) and methyl red (MR). Two polymorphs each of …
-
Investigation of the effects of colloidal suspension properties on spatially resolved diffuse reflectance
… from a novel spatially and angularly resolved diffuse reflectance measurement (SAR-DRM) is proposed. This approach incorporates Mie theory and particle size distribution function, followed by Farrell's diffuse approximation to model specified reflectance signal. The developed methodology does …
-
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 …
-
Raman spectroscopy and diffuse reflectance spectroscopy for diagnosis of human cancer and acanthosis nigricans
… 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 reflectance …
-
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 …
-
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 …
-
Non-destructive analysis of popular cigarette brands utilizing attenuated total reflectance (ATR) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) and chemometrics
… of unknown samples. Popular techniques include Diffuse Reflectance Infrared Fourier Transform Infrared Spectroscopy (DRIFTS) and transmission FTIR. When combined with chemometrics, a mathematical approach to finding similarities and differences among samples, infrared analysis can be used to …
-
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 …
-
Oblique-incidence fiber-optic reflectometry for measuring absorption and scattering in turbid media
… light produces a spatial distribution of diffuse reflectance that is not centered about the point of light entry. The shift in the center of diffuse reflectance is related to the medium's diffusion coefficient, D. We developed a fiber-optic probe to deliver light obliquely and sample the …
-
Differential light scattering spectroscopy measurements for detecting and imaging cancer
… the single backscattering signal from a reflectance spectrum dominated by multiple scattering and diffuse reflectance. SD/LSS exploits the penetration abilities of diffuse reflectance while /LSS exploits the angular asymmetry of single backscattering from large particles. O/LSS has the …
-
Compuestos de coordinación de iones de metales de transición con ligandos heterocíclicos dadores de S,N
… through elemental analysis, IR, UV-Vis-NIR diffuse reflectance, EPR, magnetic susceptibility, mass spectroscopy, X-ray single-crystal and powder diffractometry. Besides, we studied the antimicrobial activity and phagocytic functíon in humans neutrophils treated with complexs and ligands …
-
Development of novel photocatalysts for solar hydrogen production
… FeVO4, although traces of hematite were found. Diffuse-reflectance UV spectroscopy and subsequent Tauc plots revealed a band gap of ca. 2.00 eV corresponding to an indirect transition. Photocurrent-voltage characteristics recorded under simulated solar illumination indicate that photocurrents …
-
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 …
-
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. …
-
Development of Multi-Modality Imaging Cart for Barrett’s Esophagus
… 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 develop a non-invasive endoscopic capsule and …
Page 1 of 5