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 446 for “"absorbance"”.
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Absorbance modulation optical lithography
In this thesis, the concept of absorbance-modulation optical lithography (AMOL) is described, and the feasibility experimentally verified. AMOL is an implementation of nodal lithography, which is not bounded by the diffraction limit of incident lights. Experimental results showed promising …
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Overcoming the far-field diffraction limit via absorbance modulation
… optical techniques. The proposed technique with absorbance modulation aims to get around the diffraction limit by using wavelength-selective chemistry to confine light to nanoscale dimension. Absorbance modulation lithography and imaging is a near-field technique that does not require scanning of …
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Spectral processing algorithms for predicting glucose concentration of various solutions from NIR absorbance spectroscopy
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Determination of thiamine in solution by UV-visible spectrophotometry: The effect of interactions with gold nanoparticles
… in the formation of a secondary peak in the absorbance spectrum of the mixture. This peak can be used as an indicator of thiamine, which is useful for the qualitative analysis of solutions, and may provide an alternative to other methods for evaluating thiamine in blood and other biological …
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Development of New Computational Approaches to Predict the UV-Vis Behavior of Charge Transfer Organic Dyes and Application to Novel Silole Containing Dyes
… theory (TD-DFT) predictions regarding the UV-Vis absorbance of organic dyes. This work also presents the study of three new dyes that incorporate a novel functionality into their structure using the new computational methods. The first improved method was to use orbital overlap to incorporate …
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The Effects of Irradiation and Antioxidants on Myoglobin Derived From Beef Hearts
… reactive substances (TBARS), pH, Hunter color, absorbance and reflectance over the visible range (400--700 nm) and absorbance at 280 nm. Protein denaturation, protein concentration, and met- (MMb), deoxy- (DMb) and oxy- (OMb) myoglobin percentages were calculated from reflectance and absorbance …
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Identification and quantification of natural organic matter in the Windhoek operating company water treatment plant in Windhoek, Namibia
… Temperature, pH, organic content, nitrates, UV absorbance at 254 nm (UV254) and specific UV absorbance (SUVA) measurements were performed on the day of sampling. The molecular weight distribution of the organic fractions was determined using high pressure size exclusion chromatography (HPSEC) …
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EFFECT OF GENOTYPES, TANNIN LEVEL AND PROCESSING METHODS ON THE PHYSICOCHEMICAL, NUTRITIONAL AND STRUCTURAL CHARACTERISTICS OF FABA BEAN GROWN IN WESTERN CANADA
… Steam Pressure treatment. In Study 3, a higher absorbance in normal tannin genotypes for amide I and amide II peak height and area, structural CHO (STCHO), total CHO (TCHO) area and peaks (H_1015, H_1076, H_1145) and cellulosic compounds (CEC) to total CHO (TCHO) ratio. Amide I area and α-helix …
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Terahertz driven intraband dynamics of excitons in nanorods
… nanorod. The linear Terahertz transmittance and absorbance is found for nanorods that are approximately 70 nm in length and 7 nm in diameter and are compared with experimental results that have shown the first observation of intra-excitonic transitions in nanorods. We find absorbance peaks at 8.5 …
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Effects of Cinnamon Water Extract as a Cariostatic Agent on Nicotine-Induced Streptococcus Mutans Biofilm
… was used to determine total growth absorbance and planktonic growth. The microtiter plate wells were washed, fixed and stained with crystal violet dye and the absorbance measured to determine biofilm formation. Results: The results indicated that cinnamon water extract was able to …
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Design and characterization of colorimetric plasmonic nanostructures for imaging and sensing
… studied in order to amplify weak fluorescence, absorbance, and Raman signals from a small number of target molecules. Strong scattering field and large scattering cross-section at the plasmon resonance wavelength are the main factors for amplifying fluorescence, absorbance, and Raman scattering. …
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Evaluation of a planar optic waveguide as a platform for evanescent field chemical sensor development
… to bulk refractive index (glycerol), bulk absorbance (bromocresol green), and to simultaneous variations in bulk refractive index and absorbance. Cationic molecular systems were chosen to test the waveguide response to analytes which partition into or adsorb to the waveguide surface giving …
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Developing methods for measuring mitochondrial redox status and membrane potential in the isolated perfused heart
… or scintillation counter. Transmural absorbance spectroscopy can be used to measure the absorbance of intrinsic chromophores in the isolated perfused heart. The absorbance of mitochondrial cytochromes provides information about reducing equivalent delivery, respiratory flux, tissue …
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Point-based Ionizing Radiation Dosimetry Using Radiochromic Materials and a Fibreoptic Readout System
… This was accompanied by a shift in the peak absorbance wavelength. It was illustrated that some of this decrease can be corrected for by tracking the peak position and then multiplying the optical density by a correction factor based on the predicted temperature. Overall, the radiochromic …
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Characterization of Enzymes Involved in Bilin Attachment to Allophycocyanin in the Cyanobacterium Synechococcus sp. PCC 7002
… and that HT-ApcAB is present as a monomer (áâ). Absorbance and fluorescence spectroscopy illustrated that both CpcS and HT-CpcU were required to get holo-allophycocyanin with phycocyanobilin attached to the cysteine-81 residue. Absorbance of the product at 615 nm was consistent with …
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Gas chromatography/Fourier transform infrared spectroscopy/mass spectrometry for environmental analysis: A quick turnaround method for the analysis of polycyclic aromatic hydrocarbons
… methods were: the Gram-Schmidt method, maximum absorbance method and the integrated absorbance method. The results were compared to those obtained from the mass spectrometer operating in the single and total ion mode. The effect that injection volume has on quantitation was also investigated. …
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THE DETERMINATION OF TRACE METALS IN CONCENTRATED BRINES FOR PROCESS CONTROL
… complexed with the calmagite. The decrease in absorbance, at the absorbance maxima of the dye was monitored.
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Computation tools for the Fourier transform infrared (FT-IR) spectroscopic imaging
… This thesis focuses on denoising and deblurring absorbance images of the Fourier transform infrared spectroscopy for improved spatial resolution while maintaining spectral quality. In addition, it aims to speed up data-acquisition by deploying state-of-the-art computational tools such as …
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Impact of operating conditions on thermal hydrolysis pre-treated digestion return liquor
… THP on dissolved organic nitrogen (DON) and UV absorbance in return liquor was investigated. Operating conditions studied were (1) operating temperature (2) solids retention time (SRT) in the anaerobic digester (3) THP flash pressure (4) the effect of co-digestion of sewage sludge with food …
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Development of dense scintillating hard fluoride glasses for the electromagnetic caorimeter of the proposed compact muon solenoid
… of the glasses. Radiation induced optical absorbance was predominantly located in the UV with tails extending into the visible region. These glasses show partial recovery of optical absorbance at room temperature. Compositional optimisation has shown that Indium and Cerium enhance radiation …
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