Dissertations / Theses on the topic 'Spectrophotometric data'
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Burnett, Benedict. "Stellar parameter estimation from spectrophotometric data." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526545.
Full textRío, Sánchez Vanessa del. "Fast analytical methodologies based on molecular spectrophotometric techniques and multivariate data analysis." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9056.
Full textUno de ellos es la evaluación de las posibilidades que ofrecen los aceites vegetales como precursores de pre-polímeros. Se ha demostrado que la espectroscopía de infrarrojo combinada con tratamiento de datos de segundo orden es una herramienta útil para llevar a cabo el análisis cuantitativo de reacciones poliméricas modelo en las cuales intervienen aceites vegetales como reactivos iniciales.
El segundo es el control de calidad del biodiesel. Se han desarrollado dos métodos basados en análisis por inyección secuencial con detección UV-visible y tratamiento de datos de segundo orden para llevar a cabo la determinación de parámetros de interés para la caracterización del fuel.
L'objectiu principal d'aquesta tesi és el desenvolupament de metodologies analítiques ràpides basades en tècniques espectrofotomètriques moleculars i anàlisi de dades multivariants. Aquestes metodologies s'han aplicat a la resolució de dos problemes analítics relacionats amb els olis vegetals com a matèries primes.
Un d'ells és l'avaluació de les possibilitats que ofereixen aquests olis com a precursors de pre-polímers. S'ha demostrat que la espectroscopia d'infraroig combinada amb el tractament de dades de segon ordre és una eina útil per dur a terme l'anàlisi quantitatiu de reaccions polimèriques model en les quals intervenen olis vegetals com a reactius inicials.
El segon és el control de qualitat del biodiesel. S'han desenvolupat dos mètodes basats en l'anàlisi per injecció seqüencial amb detecció UV-visible i tractament de dades de segon ordre per dur a terme la determinació de paràmetres d'interès per a la caracterització del fuel.
The main objective of this thesis is the development of fast analytical methodologies based on molecular spectrophotometric techniques and multivariate data analysis. These methodologies have been applied to the resolution of two analytical problems related to the vegetable oils as raw materials.
One of them is the evaluation of the possibilities that modified vegetable oils offer as precursors of pre-polymers. It has been demonstrated that infrared spectroscopy combined with second-order data treatment is a powerful tool to carry out the quantitative analysis of model polymer reactions of interest to obtain vegetable oil-thermosetting materials.
The other one is the quality control of biodiesel. Two methods based on sequential injection analysis with UV-visible detection and second-order data treatment have been developed to determine the specific parameters of interest for the characterization of the fuel.
Da, Silva Pereira Rui. "Nearby Supernovae Factory : Calibration of SNIFS data and spectrophotometric Type la supernovae light curves." Paris 7, 2008. http://www.theses.fr/2008PA077167.
Full textType la supernovae (SNe la) are one of the pillars of modem observational cosmology, since they are good standard candies for distance measurements in the universe. The cosmological analysis using SNe la requires the observation of both high and low-redshift objects, and the smaller statistic of events on the latter case represents a major source of uncertainties. This thesis takes place within the SNfactory project, which aims to study nearby (0. 03 < z < 0. 08) SNe la using an integral field spectrograph, SNIFS. The presented work is divided into: a technical part, dealing with the acquisition, calibration and extraction of data from the SNIFS photometric camera; and an analysis where spectrophotometric light curves issued frc-m SNIFS spectra were obtained, and used to create the first spectrophotometric nearby Hubble diagram. An extraction pipeline of the differential photometric ratios between nights, needed for the flux calibration of the spectra, was built. The systematic errors affecting these ratios are estimated to be below 2%, and spectrophotometric light curves of standard stars show a 5% photometric precision of the full flux calibration on non-photometric conditions. The obtained nearby Hubble diagram presents a smaller residual scatter than the one made using currently available data. A K-correction free cosmological fit shows an additional reduction of 5% on the scatter, until now undistinguishable from the SNe la "intrinsic dispersion"
Narayan, G., T. Axelrod, J. B. Holberg, T. Matheson, A. Saha, E. Olszewski, J. Claver, et al. "TOWARD A NETWORK OF FAINT DA WHITE DWARFS AS HIGH-PRECISION SPECTROPHOTOMETRIC STANDARDS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621236.
Full textD'Antonio, Tracy A. "Esthetic blending: visual vs. spectrophotometric data analysis for different bevels in class IV dental composite direct restorations." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5450.
Full textDowds, Eileen. "Automated Data Acquisition for Analysis of Fly Ash by Graphite Furnace Atomic Absorption Spectrophotometry." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539625520.
Full textBurger, James. "Hyperspectral NIR image analysis : data exploration, correction, and regression /." Umeå : Unit of Biomass Technology and Chemistry, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200660.pdf.
Full textAnsell, Seth. "A study of ellipsoidal variance as a function of mean CIELAB values in a textile data set /." Online version of thesis, 1995. http://hdl.handle.net/1850/12232.
Full textAzevedo, Luiz Otavio Roffee. "Infra-Red Spectrophotometry and X-Ray Diffractometry as Tools in the Study of Nickel Laterites." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/231213.
Full textWetterlind, Johanna. "Improved farm soil mapping using near infrared reflection spectroscopy." Uppsala : Dept. of Soil and Environment, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/200968.pdf.
Full textQUEIROZ, CARLOS A. da S. "Terras raras: fracionamento, purificação e controle analítico." reponame:Repositório Institucional do IPEN, 1988. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11634.
Full textMade available in DSpace on 2014-10-09T14:09:15Z (GMT). No. of bitstreams: 1 12442.pdf: 17943869 bytes, checksum: d8ae26da3e514d980c366a9cafa81e22 (MD5)
Dissertacao (Mestrado)
IEA/D
Instituto de Quimica, Universidade de Sao Paulo - IQ/USP
Dyson, Raylene M. "Second order globalisation of spectrophotometric data analysis: theory, instrumentation, and application to solution equilibria." Thesis, 1997. http://hdl.handle.net/1959.13/1312473.
Full textThis work presents a new development in the analysis of equilibrium investigations using spectrophotometric titrations to now allow the analysis of a number of titrations simultaneously. We describe this as the 'second order globalisation of the analysis'. The background of equilibrium analysis, particularly spectrophotometric analysis, leading up to second order global analysis is traced in Chapter 1. Spectrophotometric analysis was first used for very simple systems measured at one wavelength; this we have termed 'zeroth order analysis'. 'First order global analysis', the analysis of single titrations measured at many wavelengths, is the present standard of spectrophotometric analysis, proving more robust and useful for complex systems. Second order global analysis is shown here to allow the analysis of even more complicated equilibria and to overcome many of the difficulties found in first order global analysis. A computer program, EQUISPEC, was written to perform second order globalisation. The theory behind and characteristics of this program are described in Chapter 2 and its success on real equilibria is demonstrated in Chapter 3. It is shown to overcome the linear dependence of individual titrations (Zn2+-phen), to allow improved definition of minor species (Eu3+-phen, Eu3+-FNAC, and Eu3+-PDA), and to result in reduced uncertainties in the refined equilibrium constants (Cu2+-dien, Cu2+-N₃phenol, and nitr). Further 2nd order global analysis proved invaluable in the investigation of the interaction of DTPA with In3+. This equilibrium was quantified in a series of competition experiments using HBED as an auxiliary coloured ligand. EQUISPEC can also perform first order global analysis in the usual way and this is done in Chapter 4 to examine the equilibria of SM3+ and DTPA versus a bifunctional DTPA analogue of relevance to nuclear medicine. It was also adapted and applied to the investigation of the high spin - low spin equilibrium for an Fe(III) complex. The instrumentation used for acquisition of the spectrophotometric data is described in Chapter 5. This Chapter also contains the description of some synthetic work, as well as the crystal structure of [Eu(FNAC)₂(TOPO)₂(NO₃)]. Fluroescence titrations are described and discussed in the context of seeking a greater understanding of the complexation of Eu3+ by ligands of relevance to fluroimmunoassay procedures.
Norman, Sarah Elizabeth. "Chemical process analysis: chemometrics; instrument control; applications in equilibrium and kinetic investigations." Thesis, 2008. http://hdl.handle.net/1959.13/802346.
Full textThis work presents the development and application of modern data acquisition and analysis techniques for the investigations of equilibrium and kinetic reactions. The analytical technique is known as second order global analysis and a background of this relatively novel approach has been given. The theory behind and characteristics of the computer programs developed analysis as part of this research are described in Chapter Two along with descriptions of the instrumentation and programs developed for the acquisition of both potentiometric and spectrophotometric data. Applications of the developed programs include a potentiometric and spectrophotometric study of the protonation and stability equilibria of a series of polydentate N-donor ligands, as detailed in Chapter Three. The combination of potentiometric and spectrophotometric analysis has been shown to be a powerful analytical tool. Spectrophotometric titrations were also combined with fast stop-flow experiments in order to elucidate the complex reaction mechanisms associated with helicating ligands. The helication of the ligand ‘PepdaH₂’ with copper(II) and nickel(II) is examined in Chapter Four, along with discussions concerning the ability to induce chirality in the helicates from the addition of a chiral counter ion. Investigations into chirality were further continued in Chapter Five where the stereoselectivity of a benzimidazole-based ligand was investigated with circular dichroism titrations. The synthesis and characterisation of the benzimidazole-based ligands are provided, including a study of the ability of the ligands to form higher order complexes as investigated using electrospray mass spectroscopy. Chapter Six provides an in-depth discussion concerning the use of combined glass hydrogen selective electrodes for the determination of equilibrium constants, as this was a major focus of this research. Different calibration techniques are discussed and a description of the internal calibration technique developed is provided along with examples of the advantages of performing internal calibration of the electrode.
Norman, Sarah Elizabeth. "Chemical process analysis: chemometrics; instrument control; applications in equilibrium and kinetic investigations." 2008. http://hdl.handle.net/1959.13/802346.
Full textThis work presents the development and application of modern data acquisition and analysis techniques for the investigations of equilibrium and kinetic reactions. The analytical technique is known as second order global analysis and a background of this relatively novel approach has been given. The theory behind and characteristics of the computer programs developed analysis as part of this research are described in Chapter Two along with descriptions of the instrumentation and programs developed for the acquisition of both potentiometric and spectrophotometric data. Applications of the developed programs include a potentiometric and spectrophotometric study of the protonation and stability equilibria of a series of polydentate N-donor ligands, as detailed in Chapter Three. The combination of potentiometric and spectrophotometric analysis has been shown to be a powerful analytical tool. Spectrophotometric titrations were also combined with fast stop-flow experiments in order to elucidate the complex reaction mechanisms associated with helicating ligands. The helication of the ligand ‘PepdaH₂’ with copper(II) and nickel(II) is examined in Chapter Four, along with discussions concerning the ability to induce chirality in the helicates from the addition of a chiral counter ion. Investigations into chirality were further continued in Chapter Five where the stereoselectivity of a benzimidazole-based ligand was investigated with circular dichroism titrations. The synthesis and characterisation of the benzimidazole-based ligands are provided, including a study of the ability of the ligands to form higher order complexes as investigated using electrospray mass spectroscopy. Chapter Six provides an in-depth discussion concerning the use of combined glass hydrogen selective electrodes for the determination of equilibrium constants, as this was a major focus of this research. Different calibration techniques are discussed and a description of the internal calibration technique developed is provided along with examples of the advantages of performing internal calibration of the electrode.
Shi, Zhining. "Enhancing UV-Vis Spectrophotometry Technology with Data Analytics for Real-time Water Quality Monitoring and Treatment Process Operation." Thesis, 2022. https://hdl.handle.net/2440/136017.
Full textThesis (Ph.D.) -- University of Adelaide, School of Chemical Engineering and Advanced Materials, 2022
Oio, Gabriel Andrés. "Propiedades espectroscópicas de galaxias Narrow Line Seyfert 1." Doctoral thesis, 2018. http://hdl.handle.net/11086/19315.
Full textLos núcleos activos de galaxias (AGN) se diferencian de las galaxias "normales" por el hecho de emitir una fracción significativa de energía que no puede ser explicada como resultado de procesos estelares. Esta fracción, proveniente de una región central muy compacta de la galaxia, es muy difícil de cuantificar. Los AGN del tipo "Narrow Line Seyfert 1" (NLS1) son una subclase de AGN con características de Seyfert 1 pero sin líneas anchas evidentes, lo cual implica grandes interrogantes sobre su estructura, dinámica y fuente central de excitación. A este tipo de galaxias se las define con el criterio de que el ancho a mitad de altura (FWHM) de la componente ancha de Hβ sea menor que 2000 km s-1 y que el cociente [OIII]λ5007/Hβ sea menor que 3. El estudio de los NLS1 puede brindarnos importante información sobre la evolución de los AGN y los mecanismos de ionización dominantes en las regiones más internas de estos objetos. Para estudiar estos objetos, seleccionamos una muestra de espectros a z < 0,1 obtenidos a partir del Sloan Digital Sky Survey. Utilizando la técnica de la síntesis espectral, separamos las diferentes componentes que contribuyen al espectro observado, a saber la componente estelar y no-estelar, y también la emisión del gas ionizado. En este trabajo se pretende cuantificar la contribución del núcleo activo al total del flujo observado y determinar el índice espectral más representativo en la región óptica del espectro en las galaxias NLS1. A partir de la técnica de síntesis espectral, también obtuvimos información sobre las diferentes poblaciones estelares presentes en estas galaxias. Por medio del espectro de emisión del gas, se determinó la dinámica y luminosidad de diferentes líneas de emisión, con las cuales estimamos masas de agujeros negros y tasas de acreción. Por último, se presenta un estudio detallado de la dinámica del gas y en particular de los vientos en la región central de la galaxia SDSS J093643.13+505249.6. Para ello se realizaron observaciones utilizando el Gemini Multi-Object Spectrographs con el Integral Field Unit (GMOS – IFU) en la región de Hβ + [OIII]λ5007 del espectro. De esta manera, obtuvimos mapas de flujo y de velocidades de estas líneas de emisión, con los cuales estimamos la extensión de los vientos en la región central de esta galaxia.
Active galactic nuclei (AGN) differ from "normal" galaxies in that they emit a significant fraction of energy that cannot be explained as the result of stellar processes. This fraction, coming from a very compact central region of the galaxy, is very difficult to quantify. Narrow Line Seyfert 1 (NLS1) AGNs are a subclass of AGNs with Seyfert 1 characteristics but without obvious broad lines, which implies big questions about their structure, dynamics and central source of excitation. These types of galaxies are defined by the criterion that the width at half maximum (FWHM) of the broad Hβ component is less than 2000 km s-1 and that the [OIII]λ5007/Hβ ratio is less than 3. The study of NLS1s can provide us with important information about the evolution of AGNs and the dominant ionization mechanisms in the innermost regions of these objects. To study these objects, we selected a sample of spectra at z < 0.1 obtained from the Sloan Digital Sky Survey. Using the spectral synthesis technique, we separate the different components contributing to the observed spectrum, namely the stellar and non-stellar component, and also the emission from ionized gas. In this work we aim to quantify the contribution of the active nucleus to the total observed flux and to determine the most representative spectral index in the optical region of the spectrum in NLS1 galaxies. From the spectral synthesis technique, we also obtained information about the different stellar populations present in these galaxies. By means of the gas emission spectra, we determined the dynamics and luminosity of different emission lines, with which we estimate black hole masses and accretion rates. Finally, a detailed study of the gas dynamics and in particular of the winds in the central region of the galaxy SDSS J093643.13+505249.6 is presented. For this purpose, observations were made using the Gemini Multi-Object Spectrographs with the Integral Field Unit (GMOS - IFU) in the Hβ + [OIII]λ5007 region of the spectrum. In this way, we obtained flux and velocity maps of these emission lines, with which we estimated the extent of the winds in the central region of this galaxy.
publishedVersion
Fil: Oio, Gabriel Andrés. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.