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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Approximation numérique par chaos de Wiener de quelques EDPS / Numerical approximation by chaos Wiener few EDPS

Nicod, Johann 10 December 2015 (has links)
Dans cette thèse nous nous intéresserons aux équations aux dérivées partielles stochastiques (EDPS) d'un point de vue aussi bien théorique que numérique. Ces équations peuvent être vues comme une généralisation du concept d'équations aux dérivées partielles (EDP) déterministes, équations donnant des modèles dans de nombreux domaines tel que la physique, la biologie ou encore l'économie. L'aspect stochastique apparaît avec la volonté de prendre en compte des données que l'on ne connaît pas de façon déterministe et dont nous avons uniquement des informations statistiques. Ces données peuvent être aussi bien un coefficient de l'équation qu'un terme de force, on qualifie alors ces données de "bruits". De par leurs complexités, il est courant de ne pas avoir de solution formelle pour certaines EDPS, la résolution numérique est alors l'unique moyen d'obtenir certaines statistiques de la solution inconnues formellement. La discrétisation de cette source d'information représentée par les termes de bruit pose le problème de leur troncature. L'information contenue dans ces termes de bruits est infini, ainsi tout comme il est impossible de représenter numériquement, sauf cas particulier, de façon exacte une fonction sur l'intervalle $[0,1]$, il est impossible de stocker de façon exacte ces termes de bruits, se pose alors la question du traitement numérique de ces termes de bruits. Une des méthodes consiste à simuler le bruit afin d'obtenir une famille de trajectoires du bruit et résoudre pour chacune de ces trajectoires l'équation associée afin de pouvoir faire des statistiques sur l'ensemble des solutions obtenues, cette méthode correspond à la méthode de Monte-Carlo. Elle offre l'avantage d'être relativement simple à mettre en œuvre mais se pose alors des problèmes de lenteur de convergence dûs au coût unitaire des intégrations numériques de chaque trajectoire qui dépendent en général de la méthode déterministe utilisée, de la dimension du problème et de la variance des moments que l'on souhaite estimer. Une deuxième philosophie est la décomposition du bruit sur une base polynomiale adaptée à une mesure de référence (ici la mesure de Wiener). C'est la méthode principalement étudiée dans cette thèse. Nous décrirons comment à l'aide d'une décomposition dite en chaos il est possible d'obtenir des statistiques de solutions d'EDPS, mais également comment on peut se servir d'une telle décomposition afin de réduire la variance dans une méthode de Monte Carlo / In this thesis, we will be interested by the numerical approximation of SPDEs. Such equations can be seen as generalization of deterministic PDEs whose coefficients have been perturbed in order to take into account incertainties. Usually those incertainties are only known through their statistical properties. This kind of data could be included into the coefficients of the PDE or can be modelized through an infinite dimensional diffusion term in the second member. The main purpose of the numerical investigations concerning SPDEs is the estimation of the joint probability distribution of its solution, and practically the estimation of some moments or some event's probabilities. The discretization of the noise's information in the small scales implies a large number of additionnal parameters and yields, in general, problems. The first and most popular method used usually is the Monte Carlo method. It relies upon the simulation of a large number of trajectories of the noise followed by the numerical integration of the associated SPDE's solution. Its main advantage is its simplicity and its capacity to be parallelized. Nevertheless, its main drawback is the rather slow convergence due to the unit cost of numerical integration of each trajectory which depend on the deterministic method used, the problem's dimension. Also the convergence can be slowed down because of the large variance of the statistical moments we want to estimate. A second approach consists in the chaos expansion of the coefficients based on a reference measure (Wiener's mesure e.g.). It will be the main purpose of this thesis. We will describe how such an expansion can be made possible in the SPDEs' framework, through the examples of the KdV and Burgers stochastic equations, in order to obtain statistical moments of the solutions but also in order to reduce wariance within a Monte Carlo method
12

The Epiphytic Macrolichens of the Greater Cincinnati, Ohio, Metropolitan Area

Washburn, Stephen Jackson 03 April 2006 (has links)
No description available.
13

Op writing : text ornamenting vision

Speight, Amanda Gaye January 2008 (has links)
The decorative and the textual have a complex and uneasy entanglement within the history and practice of modernist art. Sometimes celebrated as critical modernist strategies, sometimes denigrated or repressed as the opposite of Art, the decorative and the textual were understood as "foreign" forms that variously endangered, or, in turn, invigorated the power of art. My creative practice, which includes installation, painting, photography, text and an exhibition catalogue, exploits and explores this decorative and textual instability within modernist art practice. In my work, (visual) codes conventionally associated with the fields of writing and pattern, are re-examined and problematised by placing them within the context of visual art. When writing and pattern become the subject of painting there is an intriguing oscillation, complication and dialogue between the spaces and codes of reading and seeing, writing and pattern, the decorative and the abstract. The thesis also explores the decorative and textual instability within modernism by analysing some key contradictory moments in aesthetic thought and arts practice. In the writings of Clement Greenberg, a "decorative" painting is deemed the highest achievement of modernist abstract painting but to arrive at this goal, the decorative must be used against itself. In Frank Stella's early abstract paintings, decorative patterns structure the work, and yet the artist and his commentators only see the work as a kind of pure, abstract painting. In Lawrence Weiner's statement-sculptures, the terse, laconic text, that nominates materials and processes, is thought to be a "direct" form of art information that would remain unchanged even in reproduction. But as Weiner's work is reproduced in journals and magazines, this "direct" form of art is complicated through a variety of reproductive forms - documentary photographs, transcription errors and differences in the visual format and typography of the text. In these key moments of contradiction, concepts such as the decorative and the textual, that have often been regarded as peripheral to visual art, will be shown to have central significance in analysing its specific qualities.
14

An exploration of ego impairment in Bipolar Mood Disorder using the Ego Impairment Index-2

Simpson, Jenny Lee 16 August 2011 (has links)
The study was exploratory in nature, with 62 adult participants participating in this research. The aim of the study was to determine the level of ego impairment, if any, among a group of patients diagnosed with Bipolar Disorder. The data obtained from this sample was subjected to the Rorschach-based Ego Impairment Index-2 (EII-2). An in-depth analysis of the composite variables of this index was performed, allowing a comprehensive grasp of the implications of ego impairment in everyday functioning. The study was conducted in order to ascertain the nature of the psychological dynamics at play amongst this population group. The value of using the EII-2 is seen in its ability to establish various strengths and weaknesses in areas of ego functioning that are a core component of the personality, rather than behavioural manifestations that are sporadic and subject to change. Thus the results will reflect traits that are enduring and fundamental when considering the personality. In addition, the areas of psychological functioning that were determined were linked to the current conceptualisation of Bipolar Disorder, which, at present, is primarily conceived of as a biological disorder. The results of the EII-2 yielded from this sample indicated an overall moderate ego impairment falling within the moderate range, indicating that for this population, an impairment of ego was evident. Particularly, the domains of reality testing, cognitive functioning and object relatedness seemed to be most impaired. / Dissertation (MA)--University of Pretoria, 2010. / Psychology / Unrestricted
15

山地泰雅族國中學生自我概念、成就動機、學業成敗歸因與其學業成就之關係研究

關復勇, GUAN, FU-YONG Unknown Date (has links)
本研究的目的在於由非智力性的心理因素觀點來探討影響山地泰雅族國中學生學業成 就表現的原因,非智力性的心理因素係指自我概念,成就動機、學業成敗歸因等三變 項而言。研究樣本是取自台中以上地區四所山地國中內具山地泰雅族籍的學生共五二 五名,實施本研究之「國中學生自我認識與學習態度問卷」,以測量其自我概念,成 就動機及學業成敗歸因等三變項,並以學生在校的段考平均成績做為依變項,分別探 討此三變項與依變項之間的關係。另外,本研究亦根據Weiner的「成就動機歸因理論 」模式,視自我概念與成就動機為影響成敗歸因的前置決變項,從理論性的觀點探討 非智力性心理因素對學業成就之影響。研究結果顯示:ぇ社會自我、家庭自我、心理 自我、能力自我與學業成就間有顯著相關。え成就動機與學業成就間有顯著相關。ぉ 就成功組而言,內在歸因,穩定性歸因與學業成就間有顯著相關;就失敗組而言,內 在歸因與學業成就間有顯著相關。お成就動機對學業成就有最大的預測力,其次則為 內在不穩定歸因,生理自我,能力自我。四變項共可解釋學業成就分數總變異量的42 %。本研究即針對結果,提出討論與建議。
16

"The Strong, Silent Type": Tony Soprano, Don Draper, and the Construction of the White Male Antihero in Contemporary Television Drama

Beale, James 31 March 2014 (has links)
No description available.
17

Psychic Fax on Vibrate, Received on Phantom Limbo

Borndal, Jake 07 May 2014 (has links)
I offer a cloud of observations about language and art. I will prioritize my questions about how language operates in art, the way it functions within my own studio practice, and locate aesthetic interstices throughout. There will be insights gleaned from the various orderers of order (Lacan, Saussure) and orderers of disorder (Derrida, Agamben), walks in terra-incognita, and even some poetry on my part. I will take this chance to orient myself among different structures and deconstructions that have piledup around language, aesthetics and art.
18

Analysis of Herpetofauna Diversity and Trends in Upland Northern Mississippi Hardwood Forest and Retired Farmland

Muia, Claire 03 August 2023 (has links)
No description available.
19

Réitération en art conceptuel : une analyse du processus de consécration et de l’attribution des valeurs à travers cinq analyses thématiques, de Sol LeWitt à Louise Lawler

Théorêt, Alexandrine 09 1900 (has links)
Cette thèse a été réalisée en cotutelle entre l'Université de Montréal (Histoire de l'art) et l'Université Paris 8 (Sociologie). / En 1967, l'artiste Sol LeWitt écrit dans son texte fondateur Paragraphs on Conceptual Art que l'art conceptuel nait essentiellement d'une idée, qui constitue par ailleurs l'élément principal de l'œuvre, et que lorsque toute la planification et les décisions sont arrêtées, l'exécution matérielle de l'œuvre d’art reste superficielle. Cette conception de l'art conceptuel a été reprise et développée par de nombreux artistes qui ont remis en question et défié le statut matériel de l'œuvre d'art. Certains artistes conceptuels ont même poussé le raisonnement plus loin en créant des œuvres réitérables, c'est-à-dire des œuvres qui sont constituées d’une idée initiale et primordiale, mais qui peuvent être physiquement (re)produites, non seulement par l'artiste, mais aussi par des tiers. Ainsi, Sol LeWitt a conçu une série de wall drawings, Lawrence Weiner ses célèbres Statements, Charlotte Posenenske une suite de modules désignés sous le nom de Reliefs, Félix Gonzàlez-Torres un ensemble d’amoncellements, ou stacks et Louise Lawler une séquence d'œuvres intitulée Tracings. Ces productions, qui ont rejoint les institutions artistiques, qu'il s'agisse de salles de vente, d'expositions ou encore de collections muséales, composent le corpus à l’étude. Cette thèse alliant histoire de l’art et sociologie s'attache à retracer et à étudier les facteurs qui influent sur la valeur symbolique et pécuniaire de ces œuvres atypiques, en accordant une attention particulière aux documents produits par les artistes et par les institutions. Notre étude s’ouvre ainsi sur les définitions, la reconnaissance et la valorisation des œuvres multiples au fil du temps, sur les récits autorisés et sur les constitutions des valeurs des œuvres, en faisant ressortir les notions à partir desquelles se constituent ces valeurs, soit l’authenticité, l’originalité, l’unicité et la matérialité. À partir des notions abordées dans cette première partie, nous proposons dans la suite de cette thèse une analyse spécifique du corpus dans les différentes sphères du monde de l'art, du musée à la maison de ventes, en passant par la galerie, et complétons par un examen des discours institutionnels. Cette étude nous permet d’analyser la manière dont les œuvres d'art reproductibles et réitérables ont été appréhendées par les artistes et les institutions artistiques au fil du temps, ainsi que les moyens utilisés par ces institutions pour les exclure ou les introduire dans le canon. Notre recherche vise ainsi à mieux saisir comment les mécanismes de formation des valeurs des œuvres dites traditionnelles sont transférés aux diverses manifestations d'une forme d'art non conventionnelle : l'art conceptuel réitérable. / In 1967, artist Sol LeWitt wrote in his seminal text Paragraphs on Conceptual Art that conceptual art is essentially born of an idea, which is also the main element of the work, and that when all the planning and decisions have been made, the material execution of the artwork remains superficial. This conception of conceptual art has been adopted and developed by many artists who have questioned and challenged the material status of the work of art. Some conceptual artists have even carried this line of reasoning a step further by creating reiterable works, in other words, works that are made up of an initial, primordial idea, but which can be physically (re)produced, not only by the artist, but also by others. Sol LeWitt conceived a series of wall drawings, Lawrence Weiner his famous Statements, Charlotte Posenenske a series of modules known as Reliefs, Félix Gonzàlez-Torres a series of stacks and Louise Lawler a sequence of works entitled Tracings. These works, which have found their way into art institutions such as auction houses, exhibitions and museum collections, constitute the corpus under study. This thesis combines art history and sociology to identify and study the factors that influence the symbolic and pecuniary value of these atypical works, paying particular attention to the documents produced by artists and institutions. This study thus opens onto the definition, recognition and valorization of multiple works over time, on authorized narratives and on the determination of value, highlighting the basis upon which these values are constituted: authenticity, originality, uniqueness and materiality. Based on the notions discussed in this first section, the remainder of this thesis closely analyzes the corpus within various spheres of the art world, from the museum to the auction house, via the gallery; and it is completed by an examination of institutional discourses. This study enables us to analyze the ways in which reproducible and repeatable artworks have been understood by artists and art institutions over time, as well as the means by which these institutions have excluded them from or introduced them into the canon. This project thus aims to better grasp how the value-forming mechanisms of so-called traditional works are transferred to the various manifestations of an unconventional art form: reiterable conceptual art.
20

Analysis of the effects of phase noise and frequency offset in orthogonal frequency division multiplexing (OFDM) systems

Erdogan, Ahmet Yasin 03 1900 (has links)
Approved for public release, distribution is unlimited / Orthogonal frequency division multiplexing (OFDM) is being successfully used in numerous applications. It was chosen for IEEE 802.11a wireless local area network (WLAN) standard, and it is being considered for the fourthgeneration mobile communication systems. Along with its many attractive features, OFDM has some principal drawbacks. Sensitivity to frequency errors is the most dominant of these drawbacks. In this thesis, the frequency offset and phase noise effects on OFDM based communication systems are investigated under a variety of channel conditions covering both indoor and outdoor environments. The simulation performance results of the OFDM system for these channels are presented. / Lieutenant Junior Grade, Turkish Navy

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