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Dissertations / Theses on the topic 'Spectral Properties of Na2SeO4'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Adraou, Annette. "Spectral properties of blazars." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968797911.

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2

Baker, Steven Jeffrey. "Spectral properties of displacement models." Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2007p/baker.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2007.<br>Additional advisors: Richard Brown, Ioulia Karpechina, Ryoichi Kawai, Boris Kunin. Description based on contents viewed Feb. 5, 2008; title from title screen. Includes bibliographical references (p. 73-75).

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3

Martinez-Adame-Isais, Carmen. "Spectral properties of tridiagonal operators." Thesis, King's College London (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413716.

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4

Wang, Zuoqin Ph D. Massachusetts Institute of Technology. "Spectral properties of Kähler quotients." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43733.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2008.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 117-121).<br>The asymptotic behavior for the spectral measure of a Kähler manifold has been studied by many authors in the context of Kähler quantization. It is well known that the spectral measure has an asymptotic expansion, while the coefficients of this expansion are not known even for very simple examples. In this th

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5

Bradford, Henry. "Spectral properties of finite groups." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:10babab2-8d11-4d53-aea8-7479b868a57d.

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This thesis concerns the diameter and spectral gap of finite groups. Our focus shall be on the asymptotic behaviour of these quantities for sequences of finite groups arising as quotients of a fixed infinite group. In Chapter 3 we give new upper bounds for the diameters of finite groups which do not depend on a choice of generating set. Our method exploits the commutator structure of certain profinite groups, in a fashion analogous to the Solovay-Kitaev procedure from quantum computation. We obtain polylogarithmic upper bounds for the diameters of finite quotients of: groups with an analytic s

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6

Yee, Wai Mun. "Spectral properties of semiconductor lasers." Thesis, University of Bath, 1994. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240689.

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7

Hornberger, Klaus. "Spectral Properties of Magnetic Edge States." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-3242.

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8

Berg, Lothar &amp Plonka Gerlind. "Spectral properties of two-slanted matrices." Gerhard-Mercator-Universitaet Duisburg, 2002. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-05272002-100704/.

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For two-slanted matrices, there is shown the close connection between their spectral properties and the zeros of their corresponding symbols. The results are applied to two-scale difference equations.

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9

Chapman, Jacob W. "Spectral properties of random block operators." Thesis, The University of Alabama at Birmingham, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3561259.

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<p> Ever since the introduction of the Anderson model in 1958, physicists and mathematicians alike have been interested in the effects of disorder on quantum mechanical systems. For example, it is known that transport is suppressed for an electron moving about in a random environment, which follows from localization results proven for the Anderson model. </p><p> Quantum spin systems provide a relatively simple starting point when one is interested in studying many-body systems. Here we investigate a random block operator arising from the anisotropic <i>xy</i>-spin chain model. Allowing for

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10

Watson, Greg. "Spectral properties of periodically modulated systems." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302889.

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11

Scott, Amy Elizabeth. "Spectral properties of AGN in 2XMMi." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/27658.

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Studying the emission of Active Galactic Nuclei (AGN), particularly in the X-ray band can offer considerable insights into the accretion process. This is important as AGN activity has a strong effect on the evolution of their host galaxies. This thesis reports studies of a large sample of type 1 AGN, created by cross-correlating the optical SDSS DR5 quasar catalogue and the catalogue of serendipitous X-ray source detections, 2XMMi. A sample of 761 sources with X-ray spectra of sufficient quality for spectral modelling was obtained. The typical spectral shape of the sources is a power law of ‹Γ

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12

Yin, Mei. "Spectral Properties of the Renormalization Group." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195253.

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The renormalization group (RG) approach is largely responsible for the considerable success which has been achieved in developing a quantitative theory of phase transitions. This work investigates various spectral properties of the RG map for Ising-type classical lattice systems. It consists of four parts. The first part carries out some explicit calculations of the spectrum of the linearization of the RG at infinite temperature, and discovers that it is of an unusual kind: dense point spectrum for which the adjoint operators have no point spectrum at all, but only residual spectrum. The secon

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13

Smith, Dallas C. "Network Specializations, Symmetries, and Spectral Properties." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6998.

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In this dissertation, we introduce three techniques for network sciences. The first of these techniques is a series of new models for describing network growth. These models, called network specialization models, are built with the idea that networks grow by specializing the function of subnetworks. Using these models we create theoretical networks which exhibit well-known properties of real networks. We also demonstrate how the spectral properties are preserved as the models grow. The second technique we describe is a method for decomposing networks that contain automorphisms in a way that pr

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14

Streblyanska, Alina. "Spectral properties of X-ray background sources." Diss., [S.l.] : [s.n.], 2006. http://edoc.ub.uni-muenchen.de/archive/00004925.

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15

Murphy, Tara. "Spectral properties of stars and stellar populations." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/27086.

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One of the purposes of stellar spectral classification is to identify stars suitable for synthesising stellar populations. One of the limitations in the classification of stellar spectra is the lack of good training data at high resolution. With this and also the application of population synthesis in mind, I present a high resolution library of 6410 synthetic stellar spectra which I have generated from the Kurucz model and atmospheres. The library covers the wavelength range 3000 - 10 000 Å with 54 values of effective temperature in the range 5250 - 50 000 K, 11 values of log surface gravity

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16

Kim, In-Jae. "Spectral properties of combinatorial classes of matrices." Laramie, Wyo. : University of Wyoming, 2005. http://proquest.umi.com/pqdweb?did=990281431&sid=2&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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17

Moss, Derek. "Radio spectral properties of faint source populations." Thesis, University of Southampton, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485010.

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In this thesis, the radio spectral properties of the faint sources in two deep extragalactic radio survey areas are investigated to aid in the discrimination between AGN and starbursts. . The detailed 4-point radio spectra of two X-ray bright, optically quiescent sources in the 13H XMM/Newton/ Chandra survey area are measured, and found to be flat in one case, and steep (0: rv -0.6) in another. Deep imaging of both the 13H and 1H XMM/Newton/ Chandra survey fields at 610 MHz with the GMRT are presented. To detection limits of rv320 and 300t.tJy beam-I, 206 and 223 sources are discovered in the

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18

Pchelintseva, I. "Spectral properties of periodic pseudo-differential operators." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1357491/.

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We study elliptic diff erential and pseudo-differential operators with periodic coefficients. For a wide class of such operators we prove the Bethe-Sommerfeld conjecture, i.e. that the spectrum can have only finitely many gaps. We also study the integrated density of states of periodic Schroedinger operators and prove a lower bound for its variance in the high energy regime. This results in the lower bound for the non-integrated density of states of such operators.

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19

Russell, George Edward. "Spectral properties of graphs derived from groups." Thesis, London School of Economics and Political Science (University of London), 1995. http://etheses.lse.ac.uk/2081/.

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This thesis is primarily about spectral measures and walk-generating functions of lattices. Formally a lattice is obtained from a finitely-generated abelian group G, a finite set Y, and a finite subset L of Gxx. Informally a lattice is likely to be some structure in n-dimensional space such as a hexagonal or cubic lattice. Spectral measures and walk-generating functions determine each other, and are relevant to Markov Chains and networks of resistances. Formulae for spectral measures and walk generating functions of lattices are found, and generalised to sum-difference graphs and graphs obtain

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20

Pennington, R. C. "Spectral properties and modes of surface microcavities." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/66438/.

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This thesis describes the experimental investigations into the transverse mode structure of nearly hemispherical microcavities. The nearly hemispherical niicrocavity structures are fabricated electrocemically through a template of self assembled latex spheres. Controlling the electrochemical parameters, such as the electrochemical solution and electrode potential. allows a wide range of uearly henuspherical rnicrocavities to be realised. The spatial intensity profiles arid resonant frequeucies of the transverse modes of nearly hemispherical nucrocavities are measured experimentally for a wide

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21

Zoalroshd, Seyed. "On Spectral Properties of Single Layer Potentials." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6445.

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We show that the singular numbers of single layer potentials on smooth curves asymptotically behave like O(1/n). For the curves with singularities, as long as they contain a smooth sub-arc, the resulting single layer potentials are never trace-class. We provide upper bounds for the operator and the Hilbert-Schmidt norms of single layer potentials on smooth and chord-arc curves. Regarding the injectivity of single layer potentials on planar curves, we prove that among single layer potentials on dilations of a given curve, only one yields a non-injective single layer potential. A criterion for i

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22

Lang, Robert J. Yariv Amnon. "Semiconductor lasers : new geometries and spectral properties /." Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-11142007-081143.

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23

Madronero, Pabón Guillermo Javier. "Spectral properties of planar helium under periodic driving." Diss., lmu, 2004. http://nbn-resolving.de/urn:nbn:de:bvb:19-21879.

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24

Board, John Arnold. "Computer simulation of spectral properties of ionic systems." Thesis, University of Oxford, 1986. https://ora.ox.ac.uk/objects/uuid:948decd0-2dc0-42cd-982f-c5d9a3bad1b2.

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The technique of Molecular Dynamics (MD) computer simulation is coupled with the interrelated theories of light scattering and atomic polarisability to develop and test models for the Raman scattering from alkali halide systems. The primary interest is in the spectrum and intensity of the scattering from melts, but scattering from crystals is also considered. Two computationally tractable models for the Raman scattering are developed. One, a qualitative model capable of reproducing light scattering lineshapes in Nal, is based on approximations to the quantum-mechanical transition rates for the

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25

Liptay, Thomas J. (Thomas John). "Spectral properties of semiconductor nanocrystals and their applications." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40502.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (p. 174-177).<br>The ability to engineer the optical properties of the semiconductor nanocrystals by controlling their growth - size, shape, materials, coatings, etc - makes them appealing for many optical applications. Despite the impressive development of nanocrystal manufacturing capabilities, there are still many basic questions about how to model nanocrystals that have yet to be adequately answered. This thesis investigates three import

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26

Rittenhouse, Michelle L. "Properties and Recent Applications in Spectral Graph Theory." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/1126.

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There are numerous applications of mathematics, specifically spectral graph theory, within the sciences and many other fields. This paper is an exploration of recent applications of spectral graph theory, including the fields of chemistry, biology, and graph coloring. Topics such as the isomers of alkanes, the importance of eigenvalues in protein structures, and the aid that the spectra of a graph provides when coloring a graph are covered, as well as others.The key definitions and properties of graph theory are introduced. Important aspects of graphs, such as the walks and the adjacency ma

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27

Carleo, Giuseppe. "Spectral and dynamical properties of strongly correlated systems." Doctoral thesis, SISSA, 2011. http://hdl.handle.net/20.500.11767/4289.

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In the first part of the Thesis we mostly concentrate on spectral properties of strongly correlated systems and on their equilibrium properties. This is accomplished by the general concept of imaginary-time dynamics which we apply to a number of different problems in which different strengths of this approach emerge. In Chapter 1 we introduce the formalism that allows for a connection between the quantum and the classical worlds. The connection is established by means of the imaginary-time quantum evolution which, under certain circumstances, is shown to be equivalent to a classical stochast

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28

Zreik, Mahdi. "Spectral properties of Dirac operators on certain domains." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0085.

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Cette thèse se focalise sur l'étude spectrale des modèles de perturbations de l'opérateur de Dirac libre en dimensions 2 et 3.Le premier chapitre de cette thèse étudie la perturbation de l'opérateur de Dirac par une grande masse M, supportée sur un domaine. Notre objectif principal est d'établir, sous la condition d'une masse M suffisamment grande, la convergence de l'opérateur perturbé vers l'opérateur de Dirac avec la condition au bord MIT bag, au sens de la norme de la résolvante. Pour se faire, nous introduisons ce que nous appelons les opérateurs Poincaré-Steklov (PS) (comme un analogue d

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29

Garrett, Kevin James. "Study of ice cloud properties using infrared spectral data." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1420.

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30

Glaser, Danney R. Lee Jejung. "Estimation of alluvium properties from spectral induced polarization measurements." Diss., UMK access, 2007.

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Thesis (M.S.)--Dept. of Geosciences. University of Missouri--Kansas City, 2007.<br>"A thesis in urban environment geology." Typescript. Advisor: Jejung Lee. Vita. Title from "catalog record" of the print edition Description based on contents viewed Dec. 18, 2007. Includes bibliographical references (leaves 105-112). Online version of the print edition.

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31

Dumais, Guy. "Killing spinors and spectral properties of the Dirac operator." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55442.

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A survey of the spectral properties of the classical Dirac operator on a Riemannian spin manifold is made. Killing spinors, which are special eigenfunctions of the Dirac operator, are studied and necessary conditions for their existence are given. Killing spinors on $ IR sp{n}$, $S sp{n}$ and $H sp{n}$ are also computed explicitly. Finally the transformation law for Dirac operator under conformal change of the metric is computed and a lower bound for the eigenvalues is given.

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32

Gemmell, F. "Effects of SO2Ì² on the spectral properties of leaves." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233665.

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33

Qi, Jiaguo 1959. "Spectral properties of paddy rice with variable water depth." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277119.

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An experiment was conducted to determine whether the water depth (above soil) and soil type would have any influence on the multispectral reflectances of paddy rice, and their calculated vegetation index values. The results showed that, when vegetation cover was low (below 600 grams of dry biomass per square meter), the near infrared (NIR) reflectances decreased very little with water depth. The same was true for red reflectances, but to a lesser degree. Overall the changes were not significant at 0.05 level of significance when the water depth was increased from 2.5 centimeters to 10 centimet

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34

Haese-Hill, William. "Spectral properties of integrable Schrodinger operators with singular potentials." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19929.

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The integrable Schrödinger operators often have a singularity on the real line, which creates problems for their spectral analysis. In several particular cases we show that all closed gaps lie on the infinite spectral arc. In the second part we develop a theory of complex exceptional orthogonal polynomials corresponding to integrable rational and trigonometric Schrödinger operators, which may have a singularity on the real line. In particular, we study the properties of the corresponding complex exceptional Hermite polynomials related to Darboux transformations of the harmonic oscillator, an

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35

McGhie, Devin Burnell. "Some Spectral Properties of a Quantum Field Theoretic Hamiltonian." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6586.

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We derive the ground-state eigenvalues and eigenvectors for a simplified version of the 1-D QED single electron-photon model that Glasgow et al recently developed [2]. This model still allows for meaningful interaction between electrons and photons while keeping only the minimum needed to do so. We investigate the interesting spectral properties of this model. We determine that the eigenvectors are orthogonal as one would expect and normalize them.

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36

Catanzaro, Alessio. "Spectral properties of stochastic matrices: an application to random walks." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14519/.

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In questa tesi si affronta il problema di determinare il tempo di rilassamento di una random walk a partire dalle proprietá strutturali del network sottostante. In particolare nel primo capitolo si affrontano alcuni teoremi di teoria delle matrici random per determinare come si distribuiscano gli autovalori di matrici stocastiche i cui elementi opposti abbiano una correlazione o meno. Nel secondo capitolo si ripercorre la teoria generale delle catene di Markov e si collegano i risultati teorici alla determinazione del tempo di rilassamento di una random walk su un network. Infine si presentano

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37

Nordin, Jakob. "Spectral Properties of Type Ia Supernovae and Implications for Cosmology." Doctoral thesis, Stockholms universitet, Fysikum, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-56785.

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Type Ia supernovae can, for a short period of time, reach the same brightness as an entire galaxy. They are responsible for the creation of a large fraction of all heavy elements and can be used, as standard candles, to prove that the expansion of the universe is accelerating. Yet, we do not fully understand them. A basic picture where Type Ia supernovae are caused by thermonuclear explosions of white dwarfs is generally accepted, but the details are still debated. These unknowns propagate into systematic uncertainties in the estimates of cosmological parameters. A Monte Carlo framework, SMOCK

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38

Barra, De La Guarda Felipe. "Spectral, scattering and transport properties of quantum systems and graphs." Doctoral thesis, Universite Libre de Bruxelles, 2000. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211763.

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39

Schmidt, Eric Otto. "Cloud properties as inferred from HIRS/2 multi-spectral data." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/26817.

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40

Arrieta, Jose M. "Spectral properties of schrodinger operators under perturbations of the domain." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/29459.

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41

Goolamali, Zia. "The design, synthesis, and spectral properties fluorescent probes for potassium." Thesis, Brunel University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357110.

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42

Batt, Gary Michael. "Investigation of the spectral properties of disordered alloys and superconductors." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495921.

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43

Barton, Nicholas. "Transport and spectral properties of the one dimensional sine map." Thesis, University of Warwick, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269050.

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44

Romero, Colmenero Encarnacion. "Spectral properties of X-ray selected narrow emission line galaxies." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300403.

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45

Malcom, Lindsey Ellen S. B. Massachusetts Institute of Technology. "Relating size and spectral reflectance properties of S-type asteroids." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/114100.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2001.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 47-48).<br>The spectral slopes of 701 S-type asteroids have been statistically shown to depend on asteroid size. The spectral reflectance data were taken during the second phase of the Small Main-belt Asteroid Spectroscopic Survey. It was concluded that larger S-type asteroids have a higher spectral slope than smaller S-type asteroids, implying that S-type asteroids are likely to be undergoing

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46

Hemery, Adrian D. "The spectral properties and singularities of monodromy-free Schrödinger operators." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10200.

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The main object of study is the theory of Schrödinger operators with meromorphic potentials, having trivial monodromy in the complex domain. In the first part we study the spectral properties of a class of such operators related to the classical Whittaker-Hill equation (-d^2/dx^2+Acos2x+Bcos4x)Ψ=λΨ. The equation, for special choices of A and B, is known to have the remarkable property that half of the gaps eventually become closed (semifinite-gap operator). Using the Darboux transformation we construct new trigonometric examples of semifinite-gap operators with real, smooth potentials. A simi

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Albano, Alessandra. "Spectral and timing properties of transient anomalous x-ray pulsars." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3427009.

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In the last years, thanks to new generation satellites (mostly Chandra and XMM-Newton), an increasing number of high resolution spectral and timing observations of X-ray emitting isolated neutron stars (INS)has become available. Several new classes of X-ray emitting INSs have been discovered, all of them radio silent or with radio properties much at variance with those of Pulsar Radio (PSRs): X-ray Dim Isolated Neutron Stars (XDINSs), Anomalous X-ray Pulsars (AXPs) and Soft Gamma-ray Repeaters (SGRs), Central Compact Objects (CCOs), Rotating Radio Transient (RRATs, in one case). AXPs and SG

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48

Pintore, Fabio. "X-ray spectral states and metallicity of Ultra Luminous X-ray sources: a deeper insight into their spectral properties." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423019.

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Ultraluminous X-ray sources (ULXs) are a class of extragalactic, off nuclear and point-like sources with isotropic X-ray luminosities higher than 1e39 erg/s. They are supposed to be accreting Black Hole binaries systems but the accretion mechanisms at the basis of their extremely high X-ray luminosity are still matter of debate. We carried out a detailed spectral analysis of all the available XMM-Newton observations of two ULXs in NGC 1313, adopting a common model based on a multicolor disc plus a comptonizing component. We were able to describe the spectral evolution of the two sources withi

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49

Martinazzo, Michele. "Cloud optical properties parameterizations for infrared high spectral resolution fast codes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21747/.

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Lo scopo principale di questo lavoro di tesi è quello di produrre un set di parametrizzazioni analitiche per le proprietà ottiche delle nubi e degli aerosoli, utili per essere implementate in un codice veloce di trasferimento radiativo. Il codice veloce da noi preso in considerazione è sigma-IASI-as. Allo stato attuale, questo modello incorpora delle routines di Mie, le quali vengono sfruttate per il calcolo dello spessore ottico in presenza di nubi o aerosoli. Inoltre il codice sfrutta l'approssimazione di Chou allo scopo di tener conto dello scattering della radiazione infrarossa da parte d

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50

Knetter, Christian. "Perturbative continuous unitary transformations: spectral properties of low dimensional spin systems." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968587712.

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