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Dissertations / Theses on the topic 'Fractional moments'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Wollny, Alexander. "Fractional Moments and Singular Field Response." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-219916.

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In this PhD thesis, the physics of vacancies in two-dimensional ordered Heisenberg antiferromagnets is investigated. We use semi-classical methods to study the influence of a single vacancy in long-range ordered states, with a focus on non-collinear order. Here, on a classical level, a magnetic distortion is created as the spins readjust in response to the vacancy. We use the non-collinear $120^\\circ$ state on the frustrated triangular lattice as an example, where we determine the impurity contributions to the magnetization and susceptibility. An important discovery is the vacancy moment not
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2

Wollny, Alexander [Verfasser], Matthias [Akademischer Betreuer] Vojta, and Sebastian [Gutachter] Eggert. "Fractional Moments and Singular Field Response : Vacancies in Two-Dimensional Ordered Antiferromagnets / Alexander Wollny ; Gutachter: Sebastian Eggert ; Betreuer: Matthias Vojta." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://d-nb.info/1128036673/34.

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3

Poisat, Julien. "Modèle d’accrochage de polymères en environnement aléatoire faiblement corrélé." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10056/document.

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Cette thèse est consacrée à l’étude du modèle d’accrochage en environnementfaiblement corrélé. Le modèle d’accrochage s’applique à de multiples situationstelles que la localisation d’un polymère au voisinage d’une interface unidimensionnelle,la transition de mouillage ou encore la dénaturation de l’ADN, le pointcommun étant la présence d’une transition entre une phase localisée et une phasedélocalisée.Nous commençons par donner un aperçu des résultats disponibles sur lescourbes et exposants critiques pour le modèle homogène puis pour le modèledésordonné lorsque le désordre est une suite de var
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4

Srzic, Veljko. "Significance of transport dynamics on concentration statistics and expected mass fraction based risk assessment in the subsurface." Doctoral thesis, KTH, Mark- och vattenteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133455.

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This thesis relies on a Langrangian framework used for conservative tracer transport simulations through 2-D heterogeneous porous media. Conducted numerical simulations enable large sets of concentration values in both spatial and temporal domains. In addition to the advection, which acts on all scales, an additional mechanism considered is local scale dispersion (LSD), accounting for both mechanical dispersion and molecular diffusion. The ratio between these two mechanisms is quantified by the Peclet (Pe) number. In its base, the thesis gives answers to contaminant concentration features when
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5

Gotte, Jorge Bernhard. "Integral and fractional orbital angular momentum of light." Thesis, University of Strathclyde, 2006. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26372.

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Orbital angular momentum of light is a new field of research which is concerned with the mechanical and optical effects of light with a helical phase structure. In this thesis we ask fundamental questions on the properties of light carrying orbital angular momentum. We discuss the uncertainty relation for angle and angular momentum on the example of orbital angular momentum of light. The lower bound in the angular uncertainty relation is state dependent, which requires a distinction between states satisfying the equality in the uncertainty relation and states giving a minimum in the uncertaint
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6

Mokni, Hichem. "Prolongement d'applications linéaires, espaces des fractions et problème des moments." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10101/document.

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Nous nous intéressons dans ce travail au prolongement d'applications linéaires, que ce soit des fonctions à valeurs scalaires ou des applications à valeurs opérateurs, sur des limites inductives d'espaces vectoriels topologiques en général et en particulier sur des algèbres d'opérateurs. Dans un premier lieu, nous regardons le problème dans le cadre le plus général c'est à dire celui de prolonger des formes linéaires sur une limite inductive d'espaces localement convexes. Nous donnons une condition nécessaire sur ces formes pour que le prolongement soit possible. Nous nous intéressons aussi au
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7

Park, YeJe. "Guiding-center hall viscosity and intrinsic dipole moment of fractional quantum Hall states." Thesis, Princeton University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3665335.

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<p> The fractional quantum Hall effect (FQHE) is the archetype of the strongly correlated systems and the topologically ordered phases. Unlike the integer quantum Hall effect (IQHE) which can be explained by single-particle physics, FQHE exhibits many emergent properties that are due to the strong correlation among many electrons. In this Thesis, among those emergent properties of FQHE, we focus on the guiding-center metric, the guiding-center Hall viscosity, the guiding-center spin, the intrinsic electric dipole moment and the orbital entanglement spectrum. </p><p> Specifically, we show tha
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8

Fong, Che Ping. "Jet fragmentation at small momentum fractions in quantum chromodynamics." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239209.

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9

Scipioni, Angel. "Contribution à la théorie des ondelettes : application à la turbulence des plasmas de bord de Tokamak et à la mesure dimensionnelle de cibles." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10125.

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La nécessaire représentation en échelle du monde nous amène à expliquer pourquoi la théorie des ondelettes en constitue le formalisme le mieux adapté. Ses performances sont comparées à d'autres outils : la méthode des étendues normalisées (R/S) et la méthode par décomposition empirique modale (EMD).La grande diversité des bases analysantes de la théorie des ondelettes nous conduit à proposer une approche à caractère morphologique de l'analyse. L'exposé est organisé en trois parties.Le premier chapitre est dédié aux éléments constitutifs de la théorie des ondelettes. Un lien surprenant est étab
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10

Farah, Mohamed. "Estimation paramétrique de systèmes gouvernés par des équations aux dérivées partielles." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2311.

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Dans ce manuscrit, une attention particulière est accordée à l’identification des systèmes dynamiques dont le comportement est régi par des équations aux dérivées partielles (EDP). Afin d’atteindre cet objectif, deux algorithmes d’identification sont proposés. Le premier est un algorithme à erreur d’équation basé sur les moments partiels réinitialisés qui permettent de faire disparaitre les termes de dérivées partielles. Les paramètres du modèle obtenu peuvent alors être estimés par des approches de type moindres carrés. Cette méthode nécessite le choix d’un paramètre de synthèse ainsi qu’un n
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11

Tautenhahn, Martin, and Ivan Veselic'. "A note on correlated and non-monotone Anderson models." Universitätsbibliothek Chemnitz, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200800063.

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12

Tautenhahn, Martin. "Lokalisierung für korrelierte Anderson Modelle." Master's thesis, Universitätsbibliothek Chemnitz, 2007. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200701584.

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Im Fokus dieser Diplomarbeit steht ein korreliertes Anderson Modell. Unser Modell beschreibt kurzreichweitige Einzelplatzpotentiale, wobei negative Korrelationen zugelassen werden. Für dieses korrelierte Modell wird mittels der fraktionalen Momentenmethode im Falle genügend großer Unordnung exponentieller Abfall der Greenschen Funktion bewiesen. Anschließend wird daraus für den nicht korrelierten Spezialfall Anderson Lokalisierung bewiesen<br>This thesis (diploma) is devoted to a correlated Anderson model. Our model describes short range single site potentials, whereby negative correlations be
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13

Wollny, Alexander. "Fractional Moments and Singular Field Response: Vacancies in Two-Dimensional Ordered Antiferromagnets." Doctoral thesis, 2016. https://tud.qucosa.de/id/qucosa%3A30192.

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In this PhD thesis, the physics of vacancies in two-dimensional ordered Heisenberg antiferromagnets is investigated. We use semi-classical methods to study the influence of a single vacancy in long-range ordered states, with a focus on non-collinear order. Here, on a classical level, a magnetic distortion is created as the spins readjust in response to the vacancy. We use the non-collinear $120^\\circ$ state on the frustrated triangular lattice as an example, where we determine the impurity contributions to the magnetization and susceptibility. An important discovery is the vacancy moment not
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14

Lin, Yen-Ting, and 林彥廷. "Theoretical Analysis of Measuring the Fractional Orbital Angular Momentum of Vortex Beam." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/64153812837174495791.

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碩士<br>國立臺灣大學<br>物理研究所<br>99<br>Photons can have both spin angular momentum (SAM) and orbital angular momentum (OAM). The former is associated with the polarization of light beams, and the latter is associated with the transverse phase distribution of light beams. Because the polarization states of light beams can be described by a two-dimensional Hilbert space, the SAM states can be used to realize the qubit in the quantum information theory. On the other hand, the spatial transverse basis is infinite-dimensional and therefore can constitute the qunit system. In experiment, the vortex beams ca
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15

Deng, Jian. "Fractional Stochastic Dynamics in Structural Stability Analysis." Thesis, 2013. http://hdl.handle.net/10012/7816.

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The objective of this thesis is to develop a novel methodology of fractional stochastic dynamics to study stochastic stability of viscoelastic systems under stochastic loadings. Numerous structures in civil engineering are driven by dynamic forces, such as seismic and wind loads, which can be described satisfactorily only by using probabilistic models, such as white noise processes, real noise processes, or bounded noise processes. Viscoelastic materials exhibit time-dependent stress relaxation and creep; it has been shown that fractional calculus provide a unique and powerful mathem
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16

Huang, Hsiao-Chih, and 黃孝智. "Characterizing the Angular Quantity of an Optical Beam:Ghost Imaging Involving Berry Phase and Optical Beams Carrying Fractional Orbital Angular Momentum." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41173687637955827710.

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博士<br>國立臺灣大學<br>物理研究所<br>100<br>In the field of optics, the experimental development of quantum entanglement started prospering since the utilization of the spontaneous parametric down conversion (SPDC) as the entangled photon source. Utilizing entanglement in photon linear momentum, quantum ghost imaging (QGI) [1, 2] can obtain the image of an object, which is not on the path of the signal light beam to the “scanning” detector (camera) but on the path of its entangled idler counterpart detected by a “bucket” detector without any spatial resolution. This detection is essentially the second-ord
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17

Till, Alexander. "Long range dependence v časových řadách." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-341256.

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Title: Long range dependence in time series Author: Alexander Till Department: Department of Probability and Mathematical Statistics Supervisor: RNDr. Michaela Prokešová, Ph.D. Abstract: The diploma thesis demonstrates the necessity of a study of long range dependence, introduces fractional Gaussian noise and discusses possible definitions of long memory. It is done by notions of ergodic theory and by second moment characteristics and spectral density. These definitions are confronted with the model of fractional Gaussian noise and with intuitive understanding of long range memory. Relations a
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18

Till, Alexander. "Long range dependence v časových řadách." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-348013.

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Title: Long range dependence in time series Author: Alexander Till Department: Department of Probability and Mathematical Statistics Supervisor: RNDr. Michaela Prokešová, Ph.D. Abstract: The diploma thesis demonstrates the necessity of a study of long range dependence, introduces fractional Gaussian noise and discusses possi- ble definitions of long memory. It is done by notions of ergodic theory and by second moment characteristics and spectral density. These definitions are confronted with the model of fractional Gaussian noise and with intuitive un- derstanding of long range memory. Relatio
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19

Κολοβός, Κυριάκος. "Συνεχή κλάσματα και ορθογώνια πολυώνυμα". 2006. http://nemertes.lis.upatras.gr/jspui/handle/10889/179.

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Συνδέουμε τα Συνεχή Κλάσματα με τα Ορθογώνια Πολυώνυμα. Ξεκινώντας από τον Stieltjes και το ομώνυμο "Πρόβλημα Ροπών", φτάνουμε μέχρι τις μέρες μας μελετώντας αυτή τη σχέση με μεθόδους Συναρτησιακής Ανάλυσης.<br>We study the connection between Continued Fractions and Orthogonal Polynomials. We start from Stieltjes and his "Moment Problem". Then we present Chain sequences, methods of Functional Analysis and the Birth-Death processes.
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