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1
Till, Přemysl. "Nástroje pro počítání a monitorování osob." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442531.
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The paper details the usage of mmWave radars to track people and monitor their movement through predefined zones of interest. The theoretical part describes the physical nature of the technology and then describes algorithms which can be used to monitor using it to monitor the movement of people. In the practical part, I have developed a concrete algorithm which can be used to monitor customer queues and cash registers in shops and inform the cashiers when their presence is needed, as well as gather impersonal GDPR-compliant data about the customer's habits. Afterwards, I have developed a visualization for the Windows platform, which can be used to communicate with the radar, manage its configuration, visualize the events in real time and perform further analysis of the measured data.
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Watkins, Laura Louise. "Tracer populations in the local group." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/240582.
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So often in astronomy, an object is not considered for its individual merits, but for what we may learn from its properties regarding some larger population. The existence of dark matter is a prime example of this; we cannot see it directly but we can infer its presence by noting its effects on the stars orbiting within its potential. This thesis describes how various sets of tracer populations can be used to probe the properties of a variety of galaxies in the Local Group. I begin by describing the extraction of a variable catalogue from the Sloan Digital Sky Survey Stripe 82 dataset and then use the catalogue to select a high-quality set of RR Lyrae stars. Analysing the distribution of the RR Lyraes reveals three significant substructures in the Milky Way halo: the Hercules-Aquila Cloud and the Sagittarius Stream, which were already known to exist, and the Pisces Overdensity, which was previously undetected. It is a faint, extended structure found at ~80 kpc and is of unknown origin. Altogether, I find that nearly 80% of the RR Lyraes are associated with substructures, consistent with the theory that galaxy halos are predominantly, or even entirely, made up from disrupted satellites. I also investigate the density distribution of RR Lyraes in the halo, finding that it is best fit by a broken-power-law model, in good agreement with previous work. I go on to develop a set of tracer mass estimators that build on previous work which make use of actual (and not projected) distance and proper motion data, reflecting the amount and quality of data now available to us. I show that proper motion data is, in theory, very useful and can greatly increase the accuracy of the mass estimates; in practice, however, current analysis is hampered by the large errors inherent in the proper motion data. The results are also subject to mass-anisotropy degeneracy, which current data is not yet able to break. Nevertheless, I am able to estimate the mass of the Milky Way to be M = 2.7 ± 0.5 x 10¹² Msun and the mass of M31 to be M = 1.5 ± 0.4 x 10¹² Msun. Andromeda XII and Andromeda XIV are two M31 satellites that have been dubbed 'extreme' and are thought to be on first infall into the M31 system. I modify the classical Timing Argument so that it can be applied to two external galaxies and then apply it to M31 and each of And XII and And XIV in turn to investigate the properties of their orbits. I then run a series of Monte Carlo simulations to investigate how likely such satellites are to exist and conclude that they are not as unusual as previously believed. Finally, I discuss three upcoming wide-field, all-sky surveys and their implications for the future of the study of the Local Group.
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Boinet, Pauline. "Adolescence scarifiée : traces et mouvements symboliques d'un groupe à médiation écriture." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE2004.
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La spécificité de l’adolescence est la venue au premier plan de la génitalité. Cela entraîne à la fois une métamorphose du corps et un remaniement psychique. À l’adolescence, le corps est aussi un lieu de contradiction que tantôt il attaque, tantôt il embellit dans un érotisme effréné. En effet, la contradiction peut se traduire sous forme symptomatique et manifester l’encombrement que l’adolescent ressent devant son corps qui lui échappe. Il ne sait pas repérer ce qu’il ressent, il ne sait pas le nommer et même il ne sait pas qu’il ne sait pas. Parfois le rapport qu’il entretient avec son corps est suffisamment paradoxal pour qu’il ne puisse pas se l’approprier. C’est cette étrangeté qui va provoquer un clivage chez l’adolescent. Les deux perspectives qui émanent de ces positions sont assez différentes quant à l’avenir du sujet. Ce travail s’inscrit dans la continuité de divers travaux de recherche sur la problématique adolescente. Il vient rendre compte de la mise en place dans un service de Pédiatrie générale d’un groupe thérapeutique à médiation écriture avec des adolescentes qui se scarifient. C’est en considérant ces scarifications comme un langage du corps au coeur de la problématique adolescente et pubertaire, et au regard des difficultés que ces adolescentes ont à mettre des mots sur l’indicible de leur douleur, que le groupe a été créé. La mise en place de celui-ci correspond plus globalement à une réflexion sur le processus d’adolescence, de subjectivation, et le rapport au corps, notamment à travers le travail de symbolisation à l’adolescence. Nous interrogeons également à l’endroit de notre réflexion, la médiation écriture en tant que dépôt d’une trace sur un support, qui au même titre que la rencontre de la lame sur la peau, viendrait comme une butée (Le Breton, 2002) ; la rencontre avec la feuille par analogie au corps viendrait recréer et offrir un contenant à la souffrance psychique. Le groupe quant à lui pourrait être vécu comme espace transitionnel au sens où l'entend Winnicott, au fondement de l’expérience créatrice et rassurante pour l’adolescente. Le corps aurait alors une fonction semblable dans ce qu'il incarnerait une frontière entre un dedans et un dehors. Une des fonctions de la pratique scarificatoire serait alors de restaurer les limites du Soi dans une lutte contre un possible effondrementThe specificity of adolescence is the coming to the fore of genitality. This involves both a metamorphosis of the body and a psychic reworking. The body is also a place of contradiction that sometimes attacks, sometimes it embellishes in a frenzied eroticism. Indeed, the contradiction can be translated in symptomatic form and manifest the clutter that the adolescent feels in front of his body that escapes him. He does not know how to identify what he feels, he does not know how to name it and he does not even know he does not know. Sometimes the relationship he has with his body is sufficiently paradoxical that he can't appropriate it. It is this strangeness that will cause a cleavage in the adolescent. The two perspectives that emanate from these positions are quite different as to the future of the subject. This work is a continuation of various research works on the adolescent problem. He reports on the establishment of a therapeutic group in writing in a Pediatric General Service, writing with teenagers who are scarifying themselves. It is by considering these scarifications as a body language at the heart of the adolescent and pubertal problem, and in view of the difficulties that these teenagers have to put words on the indescribable of their pain, that the group was created. The setting up of this one corresponds more generally to a reflection on the process of adolescence, of subjectivation, and the relation with the body, in particular through the work of symbolization in adolescence. We also question the place of our reflection, the mediation writing as a deposit of a trace on a support, which as well as the meeting of the blade on the skin, would come as a stop (Le Breton, 2002); the encounter with the sheet by analogy with the body would come to recreate and offer a container for psychic suffering. The group could be seen as a transitional space in Winnicott's sense, at the root of the creative and reassuring experience for the teenager. The body would then have a similar function in what it would incarnate a border between an inside and an outside. One of the functions of the scarificatory practice would then be to restore the limits of the Self in a fight against a possible collapse
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Steiner, Beat A. "Cyclic homology and Hattori-Stallings traces for group-graded algebras /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17164.
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Sköldvall, Henning. "Able pupils in different groups : A comparative study of interaction in tracked and mixed-ability groups." Thesis, Stockholms universitet, Institutionen för språkdidaktik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88143.
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Ability grouping has become increasingly common in the teaching of English in Swedish secondary schools. This study was concerned with the effects of different group constellations on the more able pupils. The research questions involved the able pupils’ performance, their roles in mixed-ability groups and whether the learning environment is better for them when they work with other able pupils. The study used discourse analysis of group interaction in the target language between pupils in year eight. It was found that able pupils perform according to their pre-defined skill, regardless of what groups they were put in. They also supported and lifted the interaction to higher levels in mixed-ability groups. Finally, the results suggested that able pupils might have a greater chance to develop their English in tracked groups. It is argued that this has implications for the implementation of ability grouping in the teaching of second languages in Sweden.
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Felisberto, Valente Gustavo. "The Eulerian Bratteli Diagram and Traces on Its Associated Dimension Group." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40608.
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In this thesis we present two important closely related examples of Bratteli diagrams: the Pascal triangle and the Eulerian Bratteli diagram. The former is well-known and related to binomial coefficients. The latter, which is the main object of the thesis, is related to the Eulerian numbers.
Bratteli diagrams were introduced in 1972 by Ola Bratteli in his study of
approximately finite dimensional (AF) C*-algebras. In 1976, George Arthur Elliott associated to an AF C*-algebra or to a corresponding Bratteli diagram an ordered group, he called dimension group.
In the first part of the thesis we study the space of infinite paths of the Eulerian diagram, and we realize it as a projective limit of finite permutation groups.
In the second part, we study the state space of the dimension group associated to the Eulerian Bratteli diagram. It is a compact convex set and we describe its extremal points. Finally, we use this description to give a necessary and sufficient condition for an element of this dimension group to be positive.
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Sondecker, Victoria L. "Kernel-trace approach to congruences on regular and inverse semigroups." Instructions for remote access. Click here to access this electronic resource. Access available to Kutztown University faculty, staff, and students only, 1994. http://www.kutztown.edu/library/services/remote_access.asp.
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Thesis (M.A.)--Kutztown University of Pennsylvania, 1994.Source: Masters Abstracts International, Volume: 45-06, page: 3173. Abstract precedes thesis as [2] preliminary leaves. Typescript. Includes bibliographical references (leaves 52-53).
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Kenley, Stefania. "Du pastiche à l'original : traces et trajectoires de l'Independent Group (1952-1956)." Paris 8, 2005. http://www.theses.fr/2005PA082512.
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Entre 1952 et 1956, l'Independent Group (IG) a réuni à L'Institute of Contemporary Arts (ICA) de Londres, des figures majeures de l'architecture, parmi lesquelles Alison et Peter Smithson et Colin St John Wilson, de l'art, celles de Richard Hamilton, Eduardo Paolozzi, Nigel Henderson et William Turnbull, de l'histoire et de la critique de l'art et de l'architecture, celles de Reyner Banham et Lawrence Alloway. La composition changeante et controversée du groupe, aussi bien que l'absence d'une publication, d'un manifeste fondateur ou d'un programme commun, ont imposé d'éclaircir en quelle mesure l'IG a été véritablement un groupe et quelle importance a eu le choix du nom "Indépendant". Le titre "Du pastiche à l'original" indique une méthode d'analyse par laquelle l'histoire du groupe est examinée à rebours, en partant des traces historiques. Entre 2002 et 2005, des entretiens et des correspondances ont permis de préciser le sens donné par certains ex-membres du groupe aux notions opératoires du pop art : le collage, le pastiche, l'original multiple, la répétition, etc. . . à travers lesquelles, paradoxalement, a été amenée la problématique de l'original au centre de la rechercheBetween 1952 and 1956, the Independent Group gathered at the Institute of Contemporary Arts (ICA), London, the leading figures of architecture such as Alison and Peter Smithson, Colin St John Wilson, of art, such as Richard Hamilton, Eduardo Paolozzi, William Turnbull, Nigel Henderson, or of history and criticism of art and architecture, such as Reyner Banham, Lawrence Alloway. The shifting and uncertain composition of the group and the absence of any joint publication, manifesto or programme, brings up the question of the IG as a genuine group, as well as the importance of the choice of the name Independent. The title From pastiche to Masterpiece indicates a method where the history of the group is examined through flash-backs, constructed from the available historical traces. Between 2002 and 2005, interviews and correspondence helped to clarify the meaning given by certain ex-members of the IG to the key notions of Pop art, such as collage, pastiche, "multiples", repetition, that made the question of the Original central to the research
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Farrell, Amy Carissa. "Study skills of high school mathematics students compared by achievement within tracked groups /." Abstract, 2008. http://eprints.ccsu.edu/archive/00000522/01/1971ABSTR.htm.
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Thesis (M.S.) -- Central Connecticut State University, 2008.Thesis advisor: Robin S. Kalder. "... in partial fulfillment of the requirements for the degree of Master of Science in Mathematics." Includes bibliographical references (leaves 23-25). Also available via the World Wide Web.
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Lange, Torsten. "Tracing flow and salinization processes at selected locations of Israel and the West Bank - the Judea Group Aquifer and the Shallow Aquifer of Jericho." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-100679.
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Due to the low amount or unfavorable annual distribution of precipitation the exploration, allocation, sustainable exploitation, and protection of replenishable as well as fossile water resources are challanging tasks in semiarid and arid regions. Beside a few natural or artifcial surface water reservoirs the porous underground at the same time is the largest storage and transport medium for water and provides protection against evaporation and to a certain degree against surcficial introduction of contaminants. This situation is characteristic for the Near East and thus for the selected investigation areas, that are located in Israel and the West Bank, and that are subject of the conducted partail studies that are presented. The work focuses on three main subjects. On the one hand, it deals with the characterization of the young groundwater components of the discharge of four major springs of Wadi Qilt and Jericho, as well as of sampled deep wells of three important well fields. All of these objects discharge or abstract water from the Upper and Lower Judea Group Aquifer. With a thickness of about 750 m it is one of the most important groundwater reservoirs of the region and comprises mainly to varying degrees karstified and fractured limestones and dolomites. These formations underwent uplift during Senonian to Eocenian times forming a pair of double-plunging anticlinal structures (Hebron and Ramallah or Judea and Samaria Mountains, respectively) that are again subdivided into minor anticlines and synclines. The groundwater replenishment is restricted to the winter season between October and April, and to the crestal area of the mountains, where the otherwise covered aquifer rocks crop out. A strategy was developed to interpret the applied tracers for all locations in a similar way using a lumped parameter approach, which enables a direct comparison. On the other hand, the work investigates salinization processes in the Shallow Aquifer of Jericho and their discrimination. Potential sources for salinization are remnant brines that are activated to flow into the range of well extraction due to groundwater overexploitation, dissolution of salts, or formation waters from the Lisan formation. These layers represent the sediments of Lake Lisan, the Pleistocene precursor of the Dead Sea. A discrimination of the salinization mechanisms is important to develope reasonable measures to limit or lower the salt concentration in the affected wells. Consequently, the relevant measured but also potential main hydrochemical indicators and isotope tracers are identified. The large uncertainties with respect to the establishment of a well-founded water balance and to the insuffcient knowledge about the geology of the small-scale area of Jericho are discussed. Because the interpretation of the measured helium samples from the fractured and karstified aquifer of the Cretaceous Judea Group is limited, the dependencies of the He-4 accumulation in groundwater in an idealized dual-continuum aquifer are investigated with respect to the relation of the He-4 mass fluxes and the system response time to the varied parameters (groundwater head gradient, hydraulic conductivities, dispersivities, porosities) by means of a sensitivity analysis. Although the system response time is not a system variable as such it clearly turned out that knowledge about it may be an important information for the interpretation of He concentrations in groundwaters of non-stationary systems. To enhance the visual post-processing of the parameter sensitivity analysis an easily interpretable way of data presentation is introducedSemiaride und aride Gebiete stellen aufgrund des niedrigen oder ungünstig verteilten Niederschlagsdargebots eine besondere Herausforderung bezüglich Erkundung, Bereitstellung, nachhaltiger Nutzung und Schutz sich neu bildender, aber auch fossiler Wasserresourcen dar. Abgesehen von wenigen natürlichen oder künstlich angelegten Oberflächenreservoiren ist der poröse Untergrund dabei gleichzeitig Hauptspeicher und Transportmedium für Wasser und bietet einen Schutz gegen Verdunstung und bis zu einem gewissen Grade gegen oberflächig einwirkende Verunreinigungen. Diese Situation ist charakteristisch für den Nahen Osten und damit für die im Rahmen der vorliegenden Arbeit beschriebenen Teiluntersuchungsgebiete, die sich in Israel und der West Bank befinden. Die Arbeit behandelt drei Hauptthemen. Einerseits geht sie auf die Charakterisierung der Jungwasseranteile im Abfluß vier bedeutender Quellen des Wadi Qilts und Jerichos sowie in beprobten tiefen Brunnen dreier wichtiger Brunnenfelder ein. Alle diese Objekte entwässern bzw. entnehmen Wasser aus dem Oberen oder Unteren Judea Group Aquifer. Mit ca. 750 m Mächtigkeit stellt dieser eines der bedeutensten Grundwasserreservoire der Region dar und besteht hauptsächlich aus unterschiedlich stark verkarsteten und gestörten Kalkstein- und Dolomitformationen, welche zwischen dem Senon und Eozän in Form einer in sich weiter gegliederten, beid-seitig abtauchenden Doppelantiklinalstruktur herausgehoben wurde (Hebron und Ramallah bzw. Judea und Samaria Mountains). Die Grundwasserneubildung ist beschränkt auf die Zeit zwischen Oktober und April sowie auf die Kammlagen des Gebirges, wo die sonst bedeckten Schichten des Aquifers ausstreichen. Es wurde eine Strategie entwickelt, die eingesetzten Tracer auf ähnliche Weise mit Hilfe von Lumped Parameter-Modellen für alle Lokationen zu interpretieren und somit eine Vergleichbarkeit zu gewährleisten. Andererseits untersucht die Arbeit Versalzungsprozesse im Shallow Aquifer von Jericho und deren Abgrenzung untereinander. Mögliche Hauptquellen der Versalzung sind durch überhöhte Grundwasserentnahme verstärke Zuflüsse von Solen, die Lösung von Salzen aus der Lisan-Formation oder Formationswässer der Lisan-Formation, welche die Ablagerungen des Lisan-Sees, des Pleistozänen Vorgängers des heutigen Toten Meeres, repräsentieren. Eine Unterscheidung der Mechanismen hat dabei durchaus Bedeutung für die Festlegung geeigneter Gegenmaßnahmen. Demzufolge werden die ermittelten, aber auch weitere, potentielle hydrochemische Hauptindikatoren und Tracer benannt. Unsicherheiten sowohl hinsichtlich der Aufstellung einer Wasserbilanz, als auch einer unzureichend bekannten Geologie für das sehr kleinräumige Gebiet von Jericho werden diskutiert
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Li, Wen-Wei. "Vers une formule des traces stable pour le groupe métaplectique." Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00606273.
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Cette thèse se compose de deux parties, quatre chapitres. Dans le Chapitre I, on établit un formalisme d'endoscopie du groupe métaplectique Mp(2n). On prouve le transfert d'intégrales orbitales et le lemme fondamental. Dans le Chapitre II on énonce et prouve le lemme fondamental pondéré à la Arthur pour le groupe métaplectique sous l'hypothèse du lemme fondamental pondéré non standard. Dans le Chapitre III, on se propose d'étudier la formule des traces d'Arthur-Selberg pour une classe assez générale de revêtements des groupes réductifs connexes, y compris Mp(2n). On établit la formule des traces grossière et le développement fin géométrique pour ces revêtements. Dans le Chapitre IV, on aborde le côté spectral de la formule des traces en étudiant des résultats de l'analyse harmonique locale. En particulier, on établit la formule des traces locale invariante pour les revêtements.
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McNeilly, David Andrew. "The trace spectrum of Fuchsian groups of signature (0;4;0)." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/252179.
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Martins, Áudrea da Costa. "Linhas, vozes e tracks : a textura na composição musical de crianças." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/36016.
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Esta pesquisa aborda a composição musical coletiva, acústica e eletrônica, de estudantes de música com idades entre 10 e 12 anos. Tem como objetivo analisar as diversas manifestações envolvendo a textura musical, destacando o modo como se vinculam à noção de tempo e aos processos de inferência que subsidiam a atividade da criação musical. Os sujeitos são 16 alunos regulares de duas escolas públicas, que frequentaram oficinas de composição ministradas pela pesquisadora. A concepção do estudo situa a pesquisa na área da Epistemologia Genética de Jean Piaget, cujo corpo teórico dá sustentação à investigação na área da Educação Musical. Os dados foram coletados no período de novembro de 2010 a abril de 2011, mediante a inserção da pesquisadora no ambiente de trabalho, onde observou e realizou entrevistas com base no referencial teórico adotado. A tomada de decisões durante o processo composicional encontra apoio nas inferências e nas noções de sucessão, duração e simultaneidade, inerentes à noção de tempo. Apesar das diferenças no que diz respeito à abordagem composicional e nos resultados sonoros dos produtos musicais, as manifestações texturais presentes nas peças acústicas e eletrônicas apresentam similaridades em muitos aspectos. A textura musical, importante dimensão estrutural da música, é parâmetro fundamental no exercício da composição musical, oferecendo ampla margem para experimentação e expressão criativa de seus autores. Sendo assim, este trabalho poderá suscitar novas abordagens frente à prática composicional em grupo na sala aula, contribuindo para uma melhor compreensão da produção musical dos estudantes.The present research is an approach to acoustic and electronic collective musical composition by music students aged between 10 and 12. It aims to analyze the several demonstrations which involve musical texture, pointing out the way those are attached to the conception of time and the processes of inference which grant musical creation activity. The subject-matter is composed by 16 regular students from public schools who attended workshop on composition guided by the researcher. The conception of such study places the research in the area of Jean Piaget´s Genetic Epistemology whose theoretical body gives support to investigation in Musical Education area. The data have been collected during the period of November 2010 to April 2011 in the researcher´s work environment in which she performed interviews based on the adopted theoretical reference. The decision-making during the compositional process meets support in the inferences and in the concepts of sequence, length and simultaneousness which are inherent in time concept. In spite of the differences as to the compositional approach and the sound results of the musical products, the textural manifestation in the acoustic and electronic pieces proved to be similar in many aspects. The musical texture, important structural dimension in music, is a fundamental parameter in the exercise of composition. It offers a wide rank for the experimenting and creating expression of its authors. So, this work can bring new approaches in the compositional practice in group in the classroom which will provide a better comprehension in the student’s musical production.
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Green, Damon Antony. "Determination and behaviour of platinum group and associated trace-elements in ocean sediments." Thesis, Kingston University, 1996. http://eprints.kingston.ac.uk/20595/.
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The occurrence and chemistries of the platinum group elements (PGE's; Ru, Rh, Pd, Os, Ir, Pt) and gold (Au) are assessed. Current understanding of their geochemical cycling is discussed with relevance to oxidation-reduction processes in ocean sediments, and their general mobility around redox fronts. Samples of representative ocean sediment were selected, and a range of instrumentation used to constrain their inorganic geochemistry. A combination of ICP-AES and ICP-MS techniques enable the use of a single digestion procedure for the determination of a wide range of major- and trace-elements. A recently developed hydride generator AFS system was selected for the semi-automated determination of arsenic (As), selenium (Se) and antimony (Sb), and a Coulometric method was chosen to determine organic carbon (Corg) and calcium carbonate (CaC03). Available dissolution techniques are discussed, and a microwave dissolution / cation-exchange procedure refined to enable the determination of low (parts per billion; ng/g) concentrations of PGE's in sediments. A diagenetic case study was undertaken to confirm PGE enrichments above background concentrations in an active redox-controlled sedimentary environment. Samples of a qeochemically well-constrained Mediterranean core (MC07s; ...,7 ka) were digested by microwave dissolution, and analysed by ICP-MS. Clear enrichments were found all PGE's from the redox front. An Early Pliocene (3.5 Ma) turbidite (DOP Section 952A-14H-04), buried at 128 mbsf (metres below sea floor), was selected from.the Madeira Abyssal Plain (MAP) to study the longer-term stability of such PGE enrichments. The colouration suggested the unit was organic-rich and contained a fossil redox front. Pore-water data demonstrates that this unit is now experiencing a second phase of sulphate-reducing conditions. A total geochemical analysis of the core, including PGE determinations, confirmed the presence of a relic redox front, and allowed an assessment of the behaviour of platinum group and trace-elements within this system. Comparisons of PGE data from this unit with more recent « 7 ka) enrichments of the Mediterranean core suggest that post-depositional mobility of the PGE's can occur at redox boundaries within fine-grained ocean sediments of any age. Great care is needed when using PGE spikes in ancient sediments to argue for a purely extra-terrestrial source, as has recently been the case with KIT boundary mass-extinction theorists.
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Campbell, Leslie Ann. "Palaeoecology of the middle to late Cambrian Rogersville Shale, Conasauga Group, eastern Tennessee." Thesis, Boston College, 2008. http://hdl.handle.net/2345/351.
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Thesis advisor: Paul StrotherThe Rogersville Shale of the Middle to Late Cambrian Conasauga Group was deposited on the margins of Laurentia, in what is now eastern Tennessee. Based on 21 thin section samples from the ORNL-Joy2, core five distinct microlithofacies are described, trace fossils characterized, and palynological data interpreted. This investigation concluded that the Rogersville Shale was deposited in a shallow, restricted marine or possibly estuarine environment that would have been exposed to terrestrial runoff. Previous work on the Conasauga Group placed deposition of the Rogersville Shale within an intercratonic basin in approximately 250m of water, perhaps significantly deeper. This investigation found that the Rogersville Shale was likely deposited in a lagoonal setting or restricted estuarine environment that had freshwater input
Thesis (MS) — Boston College, 2008
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics
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Fedosov, Boris, Bert-Wolfgang Schulze, and Nikolai Tarkhanov. "On index theorem for symplectic orbifolds." Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2008/2655/.
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Lazareva, Olesya. "Detailed geochemical and mineralogical analyses of naturally occurring arsenic in the Hawthorn Group." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000521.
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Al, Harbat Sadek. "Groupe de tresses affine, algèbre de Temperley-Lieb affine et trace de Markov." Paris 7, 2013. http://www.theses.fr/2013PA077204.
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Dans cette thèse, on définit une tour d'algèbres de Temperley-Lieb affines de type à sur laquelle on définit une trace de Markov et on montre qu'il y a une unique telle trace. Pour y parvenir, on travaille sur quatre niveaux de type  : groupes de tresses affines, groupes de Coxeter affines, algèbres de Hecke affines et algèbres de Temperley-Lieb affines. Au niveau des tresses, on montre que le groupe de tresses affine de type À à n+1 générateurs se surjecte sur le groupe de tresses affine de type A à n générateurs, on montre que cette surjection provient d'un quotient sur un certain sous groupe et on définit une fermeture d'un élément de ce groupe que l'on appelle un lien affine. Au niveau Coxeter, on étudie le groupe de Coxeter affine de type à à n+1 générateurs, on donne un système complet de représentants des classes à gauche et des double-classes du groupe de Coxeter affine de type À à n générateurs, puis on classifie les éléments pleinement commutatifs et on en donne une forme normale. Au niveau Hecke, on définit une tour d'algèbres de Hecke affines de type À, on montre que cette tour est une tour d'inclusions, et on montre que cette tour "se surjecte" sur la tour d'algèbres de Hecke de type Ã. Au niveau Temperley-Lieb, on définit une tour d'algèbres de Temperley-Lieb affines de type À, on définit une trace de Markov comme une collection de traces sur cette tour dans sa forme la plus générale (compatibilité avec les liens affines). On obtient l'existence d'une telle trace en montrant que la tour mentionnée "se surjecte" sur la tour d'algèbres de Temperley-Lieb de type À et finalement on montre que cette trace est unique en utilisant la forme normale des éléments pleinement commutatifsIn this thesis we define a tower of affine Temperley-Lieb algebras of Type  on which we define a Markov trace and we show that there is a unique such trace. In order to do so, we work on four levels of type À : affine braid groups, affine Coxeter groups, affine Hecke algebras and affine Temperley-Lieb algebras On the braid level, we show that À-type affine braid group with n+1 generators surjects onto A-type affine braid group with n generators, we prove that this surjection cornes from a quotient on a certain subgroup and we define a closure of an element of this group which is to be called an affine link. On the Coxeter level, we study the À-type affine Coxeter group with n+1 generators, we give a full set of representatives of left cosets and double cosets of the À-type affine Coxeter group with n generators, then we classify fully commutative elements and we give a normal form for such elements. On the Hecke level, we define a tower of A-type affine Hecke algebras, we show that this tower is a tower of inclusions, and we show that this tower surjects onto the tower of A-type Hecke algebras. On the Temperley-Lieb level, we define a tower of Â-type affine Temperley-Lieb, we define a Markov trace as a collection of traces on this tower in its most general form (compatibrirty with affine links). We get the existence of such trace by showing that the mentioned tower surjects onto the tower of A-type Temperley-Lieb algebras and finally we show that this trace is unique by making use of the normal form of the fully commutative elements
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Qi, Liang, and 漆亮. "Determination of trace platinum group elements in geological samples: application to Emeishan flood basalts in SWChina." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38791079.
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Chan, Ping-Shun. "Invariant representations of GSp(2)." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1132765381.
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Qi, Liang. "Determination of trace platinum group elements in geological samples application to Emeishan flood basalts in SW China /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38791079.
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Rossin, David Alan Peter. "The development of a process trace methodology that effectively identifies the information needs of a management group." Thesis, University of Salford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245034.
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Kunsevi-Kilola, Carine. "The effect of Rooibos on trace elements absorption and biochemical parameters-Amurine model." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1463.
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Thesis submitted in fulfillment of the requirements for the degree
Master Technologiae: Biomedical Technology
In the
Faculty of Health and Wellness Sciences
At the
CAPE PENINSULA UNIVERSITY OF TECHNOLOGY
2014Over the past few decades, it has been shown that various critical diseases including heart disease, cancer, and diabetes associated with free radical generation and low endogenous antioxidant capacity, lead to oxidative stress and cell injury. In recent years, numerous studies have also reported that antioxidants, present in various beverages, vegetables and some foods have attracted a significant research interest due to their potential benefits to human health. However, epidemiological evidence shows a correlation between the intake of food rich in antioxidants and the reduced incidence of some mortality of chronic diseases, certain cancers and coronary heart disease. The aims of this study were to determine the effects of rooibos teas (fermented and unfermented) and green tea as a comparison on the biochemical parameters and the trace element absorption in a rat model. In this study 4 groups of experimental animals were used. All groups had ad libitum access to standard rat chow. Group A, the controls (11 animals), were fed with tap water; group B (11 animals) were fed with the liquid extract of fermented rooibos tea; group C (9 animals) were fed with the liquid extracts of unfermented rooibos and group D (9 animals) were fed with the liquid extract of green tea. All groups were fed for a period of 10 weeks. After the feeding period, the animals were sacrificed by euthanization with intraperitoneal injections of pentobarbital. Blood was sampled by cardiac puncture and centrifuged to obtain the serum. Some elemental analyses were performed with X-ray emission and backscattering. ICP-OES was used to determine the magnesium content. For X-ray emission, backscattering and ICP-OES analyses, 100 μL of each serum sample in a group were added to 2 mL freeze-drying tube. Of the combined specimen, 100 μL was used for the magnesium determination by ICP-OES. The remainder of the combined serum specimens for each group were freeze-dried at -80 ºC and then pressed into a pellet. The pellet was coated with carbon and analyzed using X-ray emission and backscattering. The elemental X-rays of P, S, Ca, Mn, Fe, Cu, Co, Zn, Mo, Ca and Se emitted were quantified to obtain the respective concentrations. Biochemical chemistry analyses were performed on each serum sample of each animal. The biochemical parameters tested for were total protein, albumin, globulin, total bilirubin, lactate dehydrogenase, blood urea nitrogen, uric acid, total cholesterol, aspartate aminotransferase, alanine aminotransferase, creatine phosphokinase and creatinine. The P concentration increased (p=0.028) when fed with the fermented rooibos tea liquid extract and S content increased when fed with the - the unfermented tea liquid extract (p=0.041). The concentrations of Cl and Cr were not affected (p>0.05) by any of tea liquid extracts. The unfermented rooibos tea liquid extract and the green tea indicated a decrease in the concentrations of Fe (p=0.031 and p=0.032, respectively) and Mn (p=0.041 and p=0.034, respectively). The concentrations of Fe, Zn and Cu in the serum increased when feeding with fermented rooibos tea liquid extract (p=0.024; p=0.030 and p=0.015, respectively) while Se, Mo and Mg concentrations were decreased by the liquid extracts of the fermented, unfermented and green teas (p=0.014, p=0.017 and p=0.011; p=0.024, p=0.026 and p=0.019; p=0.031, p=0.034 and p=0.025, respectively). Concerning the biochemical parameters, the total protein, globulin and the uric acid contents in the serum sample were slightly affected with the green tea extract (p=0.041, p=0.039 and p=0.047 respectively). The albumin, lactate dehydrogenase, blood urea nitrogen, the total cholesterol, the alanine aminotransferase and the aspartate aminotransferase concentrations were not affected (p>0) by any of the tea liquid extracts. However, the total bilirubin content was decreased (p=0.012) when feeding with the fermented rooibos group while the creatine phosphokinase and the creatinine contents were decreased (p=0.042 and p=0.033, respectively) when feeding with the unfermented rooibos tea liquid extract.
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Reth, Margot. "New approaches for the mass spectrometric determination of trace concentrations and congener group patterns of chlorinated paraffins in biota /." Basel : [s.n.], 2006. http://edoc.unibas.ch/diss/DissB_7617.
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Haubold, Niko. "Compressed Decision Problems in Groups." Doctoral thesis, Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-85413.
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Wir beschäftigen uns mit Problemen der algorithmischen Gruppentheorie und untersuchen dabei die Komplexität von komprimierten Versionen des Wortproblems und des Konjugationsproblems für endlich erzeugte Gruppen.
Das Wortproblem fragt für eine feste, endlich erzeugte Gruppe ob ein gegebenes Wort über der Erzeugermenge das neutrale Element der Gruppe repräsentiert. Wir betrachten das gegebene Wort jedoch in einer komprimierten Form, als Straight-line Program (SLP) und untersuchen die Komplexität dieses Problems, das wir \'komprimiertes Wortproblem\' nennen. SLPs sind kontextfreie Grammatiken, die genau einen String erzeugen. Die Eingabegröße ist dabei stets die Größe des gegebenen SLPs. Eine Hauptmotivation ist dabei, dass für eine feste endlich erzeugte Gruppe das Wortproblem ihrer Automorphismengruppe durch eine Turingmaschine in Polynomialzeit auf das komprimierte Wortproblem der Gruppe selbst reduzierbar ist.
Wir untersuchen das komprimierte Wortproblem für die verbreiteten Gruppenerweiterungen HNN-Erweiterungen (amalgamierte Produkte und Graphprodukte) und können zeigen, dass sich Instanzen des komprimierten Wortproblems von einer Turingmaschine in Polynomialzeit auf Instanzen des komprimierten Wortproblems der Basisgruppe (respektive Basisgruppen und Knotengruppen) reduzieren lassen. Weiterhin zeigen wir, dass das komprimierte Wortproblem für endlich erzeugte nilpotente Gruppen von einer Turingmaschine in Polynomialzeit entscheidbar ist.
Wir betrachten außerdem eine komprimierte Variante des Konjugationsproblems. Das unkomprimierte Konjugationsproblem fragt für zwei gegebene Wörter über den Erzeugern einer festen endlich erzeugten Gruppe, ob sie in dieser Gruppe konjugiert sind. Beim komprimierten Konjugationsproblem besteht die Eingabe aus zwei SLPs und es wird gefragt, ob die beiden Wörter die von den SLPs erzeugt werden in der Gruppe konjugierte Elemente präsentieren. Wir konnten zeigen, dass sich das komprimierte Konjugationsproblem für Graphgruppen in Polynomialzeit entscheiden lässt.
Weiterhin haben wir das Wortproblem der äußeren Automorphismengruppen von Graphprodukten endlich erzeugter Gruppen untersucht. Durch den engen Zusammenhang des komprimierten Konjugationsproblems einer Gruppe mit dem Wortproblem der äußeren Automorphismengruppe konnten wir zeigen, dass sich das Wortproblem der äußeren Automorphismengruppe eines Graphprodukts von endlich erzeugten Gruppen durch eine Turingmaschine in Polynomialzeit auf Instanzen von simultanen komprimierten Konjugationsproblemen der Knotengruppen und Instanzen von komprimierten Wortproblemen der Knotengruppen reduzieren lässt.
Als Anwendung gelten obige Resultate auch für right-angled Coxetergruppen und Graphgruppen, da beide spezielle Graphprodukte sind. So folgt beispielsweise, dass das komprimierte Wortproblem einer right-angled Coxetergruppe in Polynomialzeit entscheidbar ist.
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Horak, Tracey Anne. "An analysis of the caesarean section rate at Mowbray Maternity Hospital using Robson's Ten group Classification System by Tracey Anne Horak." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/3046.
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Suzuki, Miyu. "Quaternion distinguished representations and unstable base change for unitary groups." Kyoto University, 2020. http://hdl.handle.net/2433/253065.
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Shin, Hyunshik. "Algebraic degrees of stretch factors in mapping class groups." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51910.
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Given a closed surface Sg of genus g, a mapping class f in \MCG(Sg) is said to be pseudo-Anosov if it preserves a pair of transverse measured foliations such that one is expanding and the other one is contracting by a number \lambda(f). The number \lambda(f) is called a stretch factor (or dilatation) of f. Thurston showed that a stretch factor is an algebraic integer with degree bounded above by 6g-6. However, little is known about which degrees occur.
Using train tracks on surfaces, we explicitly construct pseudo-Anosov maps on Sg with orientable foliations whose stretch factor \lambda has algebraic degree 2g. Moreover, the stretch factor \lambda is a special algebraic number, called Salem number. Using this result, we show that there is a pseudo-Anosov map whose stretch factor has algebraic degree d, for each positive even integer d such that d≤g. Our examples also give a new approach to a conjecture of Penner.
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Naing, Thann. "Palaeoenvironmental studies of the Middle Triassic uppermost Narrabeen Group, Sydney Basin palaeoecological constraints with particular emphasis on trace fossil assemblages /." Phd thesis, Australia : Macquarie University, 1991. http://hdl.handle.net/1959.14/71228.
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"1990".Thesis (PhD)--Macquarie University, School of Earth Sciences, 1991.
Bibliography: p. 596-630.
PART 1. INTRODUCTION AND METHODOLOGY -- General introduction -- Methodology -- Classification of ichnofacies and lithofacies as used in the present study -- Definition of trace fossil zones (intervals, subintervals and levels) -- General classification of the palaeoenvironments and summary overview of the stratigraphic and geographic distribution of palaeoenvironments in the study area -- PART 2. SYSTEMATIC ICHNOTAXONOMY -- Large dwelling-burrows -- U-shaped burrows -- Vertical cylindrical burrows -- Thalassinoides, Ophiomorpha, Spongeliomorpha and turn-arounds -- Pellets and ovoid-shaped structures -- Bedding-parallel feeding and/or dwelling structures -- Dendritic feeding-burrows -- Rosette-shaped structures -- Escape-structures -- Tracks, trails and resting-traces -- Body fossils and root-penetration structures -- Miscellaneous traces -- PART 3. SYNTHESIS AND CONCLUSIONS -- Trace fossil assemblages (suites) in intervals IC to IF and their distribution in the study area -- Interpretation of the palaeoenvironmental affinities of the trace fossil zones and depositional setting of the study area -- Palaeogeographic synthesis and conclusions.
The coastal exposures of the Triassic System in the Sydney Northshore area aggregate about 180 m in thickness and comprise the uppermost part of the Narrabeen Group (namely, in ascending stratigraphic order: the Bald Hill Claystone, the Garie Formation, and the Newport Formation, the latter divisible into Lower, Middle and Upper Members) and the overlying Hawkesbury Sandstone. With the exception of mainly allochthonous plant macrofossils and palynomorphs which occur sporadically and with varying abundance in the mudrock facies of these formations, environmentally-diagnostic body fossils are rare, and, where they occur, are nowhere unequivocally indicative of marine affinities. For this reasons, and because of the predominantly fluvial lithofacies characteristics exhibited by these formations throughout much of their stratigraphic extent and especially by their channel-form/channel-like sandstones lithosomes, most previous workers have interpreted these formations to be of fluvial or fluvio-lacustrine origin except possibly for several thin planar-and thinly-bedded fine-grained intervals encompassing the Garie and Newport Formations for which several lines of evidence, including lithofacies, equivocal palaeontological, and ichnological evidence, have prompted several workers to speculate a shallow- marine, possibility coastal lagoonal or estuarine origin. -- Although trace fossils occur in reasonable abundance at various stratigraphic levels within these uppermost Narrabeen Group rocks and particularly within the Newport Formation, they have hitherto received very little systematic study. A comprehensive study of this ichnofauna shows that it is relatively diverse, comprising almost 100 different ichnotaxa (including varietal categories) of predominantly invertebrate origin, and includes several new ichnogenera and ichnospecies among the more notable of which are: two large bioglyph-bearing dwelling-burrows of probable crustacean origin (Turimettichnus conaghani and T. webbyi) and one (Pytiniichnus trifurcatum) made either by a small reptile or an amphibian; a multi-stage spiral star-shaped feeding-trace (Helikospirichnus veeversi), probably made by a worm or worm-like deposit-feeder; several new species and varieties of Rhizocorallium (the first record of this ichnogenus in the Triassic of Australia); a new species and new variety of the saltatorial running vertebrate trackway Moodieichnus (an ichnogenus previously known only from the Late Permian of North America); and a new ichnogenus of vertical/steeply-inclined cylindrical branching dwelling-burrow (Barrenjoeichnus mitchelli). -- An alternating stratigraphic pattern of trace fossil abundance and diversity characterizes the upper Narrabeen Group strata in the Sydney Northshore area, and involves four relatively thin separate assemblage zones of relatively diverse ichnofauna and thicker intervening assemblage zones which lack ichnotaxo-nomic diversity. The assemblage zones of diverse trace fossils contain some elements in common to two or more zones, notably: Thalassinoides, Skolithos, Ophiomorpha, Chondrites, Rhizocorallium Palaeophycus, and Planolites, all of which are known to have unequivocal brackish- to shallow-marine palaeoecological affinities and which globally are characteristic of the Skolithos ichnofacies. Additionally, each of these four diverse assemblage zones is characterized by one or more particular index ichnogen-era which for convenience lend their name(s) to the zones as follows, in ascending stratigraphic order: Turimettichnus-Ophio-morpha assemblage zone; Skolithos-Diplocraterion assemblage zone; Helikospirichnus assemblage zone; and Rhizocorallium-Thalass inoides assemblage zone. The intervening ichnotaxonomically less-diverse and relatively impoverished assemblage zones are not similarly and separately named but are characterized by Barrenjoeichnus mitchelli and some species of Palaeophycus, Planolites and Skolithos as well as various plant-root petrification structures, all of which are here argued to have predominantly non-marine palaeoecological affinities. These latter assemblage zones can be referred to the Scoyenia-Teredolites ichnofacies. This stratigraphic pattern of alternating ichnologi-cally diverse and impoverished assemblage zones confirms the suggestions of previous workers (notably Bunny and Herbert, and Retallack) regarding the presence of brackish-/shallow-marine palaeoenvironmental influence in these Lower and Middle Triassic strata and allow for the first time the stratigraphic resolution of the marine strata into four marine tongues which are here named after their respective type localities. These are, in ascending order: The Turimetta Head Tongue (2 m to 3 m thick; extending from at least the middle part of the Bald Hill Clay-stone almost to the top of this formation); the St. Michaels Cave Tongue (4 m to 5 m thick; encompassing the Garie Formation and the lower part of the lower Member of the Newport Formation); the Bangalley Head Tongue (3 m to 5 m thick; extending from the uppermost part of the Lower Member into the lower part of the Middle Member of the Newport Formation); and the Palm Beach Tongue (3 m to 4 m thick; comprising the uppermost part of the Middle Member of the Newport Formation). The trace fossil assemblages in each of these marine tongues are indicative of a complex of brackish- to very shallow-marine low-energy palaeoenvi-ronments typical of modern coastal lagoons or estuaries and imply the presence of a protecting coeval topographic barrier of some kind to the east or southeast. This lagoon is herein called the Newport (Coastal) Lagoon and its development in the central-eastern part of the Sydney Basin coincides approximately with the geographic and depocentral axis of the basin which trends NW-SE and intersects the present coastline in the Sydney metropolitan area. The non-marine affinities of the impoverished and less-diverse trace fossil assemblages in the intervening and overlying strata are consistent with the fluvial/fluvio-lacustrine environmental interpretations of these thicker and predominantly sandstone-dominant intervals made by many other workers. Palaeocur-rent and petrographic data from these fluvial sediments show that the streams in which they formed debouched episodically into the Newport Lagoon variously from the northwest, west and southwest and were sourced variously from both the craton (Lachlan Fold Belt) to the southwest and the New England Orogen to the northeast.
With the exception of evidence of short-lived brackish-marine conditions at the base of the Narrabeen Group in the northeastern Sydney Basin and in the top of the Ashfield Shale in the Wianamatta Group (above the Hawkesbury Sandstone) in the central part of the basin, the Triassic System of the basin is dominated by fluvial/fluvio-lacustrine sediments and the presently described marine tongues of the Newport Lagoon in the uppermost Narrabeen Group are the only other presently known record of marine conditions during the Triassic history of the basin. The development of the Newport Lagoon in the geographic and depocentral axis of the basin attests to the presence of a mild short-lived marine transgression in the latest Early and early Middle Triassic at the end of a period of declining piedmont clastic alluviation from the coeval New England Orogen to the northeast and immediately prior to the onset of a new phase of fluvial sedimentation sourced from the craton to the southwest and manifested by the deposition of the Middle Triassic Hawkesbury Sandstone.
Mode of access: World Wide Web.
xxxv, 630 p. ill., maps
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Clarke, Nerida, and n/a. "A study of the information needs and information-seeking behaviour of Australian accredited coaches in the sports of swimming and track and field." University of Canberra. Information, Language & Culture, 1995. http://erl.canberra.edu.au./public/adt-AUC20060628.150854.
Full textAbstract:
The purpose of the present study was to examine the information needs and
information seeking behaviour of coaches in the sports of swimming and track and
field who had completed level 2 accreditation of the Australian Coaching Council.
The study aimed to identify information needs, the sources from which
information is currently obtained and to gauge the level of satisfaction with current
information provision in terms of the quantity, content and timeliness of
information received. The study also aimed to examine the influence of the
independent variables of sport, geographic location and education level on
information needs and information seeking behaviour.
In line with current theoretical thinking in the examination of information needs
described in the literature, the researcher took a 'user-centred' approach in the
identification of information needs utilising the structured group discussion
process, Nominal Group Technique (NGT) as the first stage of the research. This
process established the broad parameters of coaches' information needs and
provided the basis for the design of a subsequent survey which was distributed to
all swimming and track and field coaches who had completed level 2 accrediation.
The survey resulted in a response rate of 69 percent from a total population of
568.
The study revealed that coaches have a wide range of information needs many of
which would not generally be associated with libraries, that there are few
differences between coaches from different sports, those of differing education
levels and between those of different geographic locations, although access to
information is made more difficult through geographic isolation. The study
revealed that coaches use multiple sources to obtain information and that libraries
and formal sport information providers are not key sources for most types of
information. Low levels of satisfaction were found to exist with the quantity and
content of information with the highest level of dissatisfaction being expressed
with the timeliness of information received.
The study concludes by identifying issues, recommending possible actions in
relation to these issues and identifies areas for future research.
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Ha, Ngoc-Phu. "Théorie quantique des champs topologiques pour la superalgèbre de Lie sl(2/1)." Thesis, Lorient, 2018. http://www.theses.fr/2018LORIS505/document.
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Ce texte étudie le groupe quantique Uξ sl(2|1) associé à la superalgèbre de Lie sl(2|1) et une catégorie de ses représentations de dimension finie. L'objectif est de construire des invariants topologiques de 3-variétés en utilisant la notion de trace modifiée. D'abord nous prouvons que la H catégorie CH des modules de poids nilpotents sur Uξ sl(2|1) est enrubannée et qu'il existe une trace modifiée sur son idéal des modules projectifs. De plus CH possède une structure relativement G-prémodulaire ce qui est une condition suffisante pour construire un invariant de 3-variétés à la Costantino-Geer-Patureau. Cet invariant est le cœur d'une 1+1+1-TQFT (Topological Quantum Field Theory). D'autre part Hennings a proposé à partir d'une algèbre de Hopf de dimension finie une construction d’invariants qui dispense de considérer la catégorie de H l l ses représentations. Nous montrons que le groupe quantique déroulé Uξ sl(2|1)/(e1 , f1 ) possède une complétion qui est une algèbre de Hopf enrubannée topologique. Nous construisons un invariant de 3-variétés à la Hennings en utilisant cette structure algébrique, une transformation de Fourier discrète et la notion de G-intégrales. L'intégrale dans une algèbre de Hopf est centrale dans la construction de Hennings. La notion de trace modifiée dans une catégorie s'est récemment révélée être une généralisation des intégrales dans les algèbres de Hopf de dimension finie. Dans un contexte plus général d'algèbre de Hopf de dimension infinie nous prouvons la relation formulée entre la trace modifiée et la G -intégraleThis text studies the quantum group Uξ sl(2|1) associated with the Lie superalgebra sl(2|1) and a category of finite dimensional representations. The aim is to construct the topological invariants of 3-manifolds using the notion of modified trace. We first prove that the category CH of the nilpotent weight modules over Uξ sl(2|1) is ribbon and that there exists a modified trace on its ideal of projective modules. Furthermore, CH possesses a relative G-premodular structure which is a sufficient condition to construct an invariant of 3-manifolds of Costantino-Geer-Patureau type. This invariant is the heart of a 1+1+1-TQFT (Topological Quantum Field Theory). Next Hennings proposed from a finite dimensional Hopf algebra, a construction of invariants which does not require to consider the category of its representations. We show that the unrolled H l l quantum group Uξ sl(2|1)/(e1 , f1 ) has a completion which is a topological ribbon Hopf algebra. We construct an invariant of 3-manifolds of Hennings type using this algebraic structure, a discrete Fourier transform, and the notion of G-integrals. The integral in a Hopf algebra is central in the construction of Hennings. The notion of modified trace in a category has recently been revealed to be a generalization of the integrals in a finite dimensional Hopf algebra. In a more general context of infinite dimensional Hopf algebras we prove the relation formulated between the modified trace and the G-integral
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Pilourdault, Julien. "Scalable algorithms for monitoring activity traces." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM040/document.
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Dans cette thèse, nous étudions des algorithmes pour le monitoring des traces d’activité à grande échelle. Le monitoring est une aptitude clé dans plusieurs domaines, permettant d’extraire de la valeur des données ou d’améliorer les performances d’un système. Nous explorons d’abord le monitoring de données temporelles. Nous présentons un nouveau type de jointure sur des intervalles, qui inclut des fonctions de score caractérisant le degré de satisfaction de prédicats temporels. Nous étudions ces jointures dans le contexte du batch processing (traitement par lots). Nous formalisons la Ranked Temporal Join (RTJ), une jointure qui combine des collections d’intervalles et retourne les k meilleurs résultats. Nous montrons comment exploiter les propriétés des prédicats temporels et de la sémantique de score associée afin de concevoir TKIJ , une méthode d’évaluation de requête distribuée basée sur Map-Reduce. Nos expériences sur des données synthétiques et réelles montrent que TKIJ est plus performant que les techniques de l’état de l’art et démontre de bonnes performances sur des requêtes RTJ n-aires sur des données temporelles. Nous proposons également une étude préliminaire afin d’étendre nos travaux sur TKIJ au domaine du stream processing (traitement de flots). Nous explorons ensuite le monitoring dans le crowdsourcing (production participative). Nous soutenons la nécessité d’intégrer la motivation des travailleurs dans le processus d’affectation des tâches. Nous proposons d’étudier une approche adaptative, qui évalue la motivation des travailleurs lors de l’exécution des tâches et l’exploite afin d’améliorer l’affectation de tâches qui est réalisée de manière itérative. Nous explorons une première variante nommée Individual Task Assignment (Ita), dans laquelle les tâches sont affectées individuellement, un travailleur à la fois. Nous modélisons Ita et montrons que ce problème est NP-Difficile. Nous proposons trois méthodes d’affectation de tâches qui poursuivent différents objectifs. Nos expériences en ligne étudient l’impact de chaque méthode sur la performance globale dans l’exécution de tâches. Nous observons que différentes stratégies sont dominantes sur les différentes dimensions de performance. En particulier, la méthode affectant des tâches aléatoires et correspondant aux intérêts d’un travailleur donne le meilleur flux d’exécution de tâches. La méthode affectant des tâches correspondant au compromis d’un travailleur entre diversité et niveau de rémunération des tâches donne le meilleur niveau de qualité. Nos expériences confirment l’utilité d’une affectation de tâches adaptative et tenant compte de la motivation. Nous étudions une deuxième variante nommée Holistic Task Assignment (Hta), où les tâches sont affectées à tous les travailleurs disponibles, de manière holistique. Nous modélisons Hta et montrons que ce problème est NP-Difficile et MaxSNP-Difficile. Nous développons des algorithmes d’approximation pour Hta. Nous menons des expériences sur des données synthétiques pour évaluer l’efficacité de nos algorithmes. Nous conduisons également des expériences en ligne et comparons notre approche avec d’autres stratégies non adaptatives. Nous observons que notre approche présente le meilleur compromis sur les différentes dimensions de performanceIn this thesis, we study scalable algorithms for monitoring activity traces. In several domains, monitoring is a key ability to extract value from data and improve a system. This thesis aims to design algorithms for monitoring two kinds of activity traces. First, we investigate temporal data monitoring. We introduce a new kind of interval join, that features scoring functions reflecting the degree of satisfaction of temporal predicates. We study these joins in the context of batch processing: we formalize Ranked Temporal Join (RTJ), that combine collections of intervals and return the k best results. We show how to exploit the nature of temporal predicates and the properties of their associated scored semantics to design TKIJ , an efficient query evaluation approach on a distributed Map-Reduce architecture. Our extensive experiments on synthetic and real datasets show that TKIJ outperforms state-of-the-art competitors and provides very good performance for n-ary RTJ queries on temporal data. We also propose a preliminary study to extend our work on TKIJ to stream processing. Second, we investigate monitoring in crowdsourcing. We advocate the need to incorporate motivation in task assignment. We propose to study an adaptive approach, that captures workers’ motivation during task completion and use it to revise task assignment accordingly across iterations. We study two variants of motivation-aware task assignment: Individual Task Assignment (Ita) and Holistic Task Assignment (Hta). First, we investigate Ita, where we assign tasks to workers individually, one worker at a time. We model Ita and show it is NP-Hard. We design three task assignment strategies that exploit various objectives. Our live experiments study the impact of each strategy on overall performance. We find that different strategies prevail for different performance dimensions. In particular, the strategy that assigns random and relevant tasks offers the best task throughput and the strategy that assigns tasks that best match a worker’s compromise between task diversity and task payment has the best outcome quality. Our experiments confirm the need for adaptive motivation-aware task assignment. Then, we study Hta, where we assign tasks to all available workers, holistically. We model Hta and show it is both NP-Hard and MaxSNP-Hard. We develop efficient approximation algorithms with provable guarantees. We conduct offline experiments to verify the efficiency of our algorithms. We also conduct online experiments with real workers and compare our approach with various non-adaptive assignment strategies. We find that our approach offers the best compromise between performance dimensions thereby assessing the need for adaptability
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Black, Samson 1979. "Representations of Hecke algebras and the Alexander polynomial." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10847.
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viii, 50 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.We study a certain quotient of the Iwahori-Hecke algebra of the symmetric group Sd , called the super Temperley-Lieb algebra STLd. The Alexander polynomial of a braid can be computed via a certain specialization of the Markov trace which descends to STLd. Combining this point of view with Ocneanu's formula for the Markov trace and Young's seminormal form, we deduce a new state-sum formula for the Alexander polynomial. We also give a direct combinatorial proof of this result.
Committee in charge: Arkady Vaintrob, Co-Chairperson, Mathematics Jonathan Brundan, Co-Chairperson, Mathematics; Victor Ostrik, Member, Mathematics; Dev Sinha, Member, Mathematics; Paul van Donkelaar, Outside Member, Human Physiology
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Fürst, Oliver [Verfasser]. "Trace-class properties of semi-groups associated with operator valued differential operators and their Witten index / Oliver Fürst." Bonn : Universitäts- und Landesbibliothek Bonn, 2021. http://d-nb.info/1239729677/34.
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CARBONARO, DANIELLE P. "Designing a Database and Pilot Testing to Properly Track Food Group Consumption in Overweight/Obese Postpartum Women Enrolled in a Dietary Intervention Study." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1218058036.
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Frau, Simona. "Fluoro-deoxy-carbohydrates as prosthetic groups for PET imaging : studies towards novel PET tracers for the cannabinoid system and angiogenesis-related receptors." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=225655.
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A novel class of potential positron emission tomography (PET) radiotracers for imaging aminopeptidase N (also known as APN or CD13) and cannabinoid type 1 (CB1) receptors were designed and synthesised with an efficient chemical strategy. Both targets have remarkable diagnostic and therapeutic potential, in fact the CD13 receptors are over-expressed during tumour angiogenesis and the CB1 receptors are highly expressed in the brain playing important functions in several pathophysiological processes. The target compounds were obtained by means of oxime-bio-conjugation between fluoro-deoxy-carbohydrates, used as prosthetic groups, and hydroxylamine-functionalised cyclic NGR (asparagine-glycine-arginine) motif sequences for CD13 receptor and rimonabant-type pyrazoles for the CB1 receptor. In particular, aminooxy-cyclic NGR peptides were conjugated with the novel prosthetic group 5-FDR (5-fluoro-5-deoxy-D-ribose) and the aminooxy- pyrazole-type cannabinoid molecules were conjugated with both 5-FDR and with FDG (2-fluoro-2-deoxy-D-glucose). 5-FDR proved to be superior to FDG, as the bioconjugation reaction occurred in milder conditions (room temperature vs 100 °C) and at faster rate. Furthermore, we observed that the rate of the oxime bond formation depends on the solubility of the aminooxy-functionalized core used. In fact, the bioconjugation with hydrophilic cyclic aminooxy-NGR peptides was faster than in the case of lipophilic aminooxy-pyrazoles (10 min vs 20-30 min). The receptor affinity is decreased in the case of the CB1 receptors after conjugation with the fluoro-carbohydrates. This is not observed with the conjugated NGR peptides, which maintain similar affinity for the CD13 receptor compared with the unconjugated NGR. In conclusion, we have developed an efficient strategy for the synthesis of a novel class of CD13 ligands, which may be also produced in radiofluorinated form, and explored a novel bioconjugation strategy for CB1 receptor ligands. Both may have important applications in the development of PET tracers.
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Burgun, Christophe. "Caractérisation et modélisation des besoins énergétiques d'un tracteur agricole : application à l'étude des performances en lien avec les lubrifiants du groupe motopropulseur." Paris 6, 2013. http://www.theses.fr/2013PA066824.
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Lermen, Raquel Elisa. "Assinaturas icnológicas em depósitos glacigênicos do Grupo Itararé no RS." Universidade do Vale do Rio dos Sinos, 2006. http://www.repositorio.jesuita.org.br/handle/UNISINOS/4247.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
A revisão icnotaxonômica da paleoicnofauna Grupo Itararé no RS revelou a presença de uma icnofauna dominada por trilhas de artrópodes, com impressões de repouso e pistas de deslocamento intraestratal de artrópodes e escavações rasas de organismos vermiformes subordinadas, além de icnofábricas de Chondrites-Planolites-Palaeophycus. Duas novas icnoespécies, Cruziana intermittens n. isp. e Tonganoxichnus itararensis n. isp. foram diagnosticadas. A análise das assembléias icnofossilíferas evidenciou a presença duas paleoicnocenoses distintas: (i) Paleoicnocenose A, contendo trilhas de deslocamento de artrópodes e escavações rasas de artrópodes e de organismos vermiformes, vinculada à fácies de ritmitos; e (ii) Paleoicnocenose B, reunindo exclusivamente escavações mais profundas, vinculada à fácies de depósitos heterolíticos. Quatro suítes distintas são observadas na Paleoicnocenose A: (i) suíte MP, contendo Maculichna varia, Protichnites isp., Diplichnites gouldi e Diplopodichnus biformis, com Kouphichnium isp. subordinado, vinculada aos ritmitos do tipo A; (ii) suíte HT, composta por Helmithoidichnites tenuis e Treptichnus pollardi, com Nereites isp. e Tonganoxichnus itararensis n. isp. subordinados, vinculada com os ritmitos do tipo B; (iii) suíte CR, contendo Cruziana problematica, C. intermittens n. isp., Rusophycus carbonarius e Gluckstadtella cooperi, com H. tenuis subordinado, vinculada aos ritmitos do tipo C; e (iv) suíte Dg, monoespecífica para Diplichnites gouldi, preservada em palimpsesto sobre a suíte CR. A Paleoicnocenose B é formada por icnofábrica composta de Chondrites/Planolites, produzida em níveis intermediários do substrato, e Palaeophycus, em níveis mais superficiais. As assinaturas icnológicas registradas sugerem um sistema deposicional estuarino do tipo fiorde, com a zona mais proximal do estuário situada a ENE (região de Cachoeira do Sul) e a mais distal, a SSW (região ao sul de São Gabriel-sudoeste de Lavras do Sul). Os ritmitos do tipo B se concentrariam na região mais proximal, os ritmitos dos tipos A e C se desenvolveriam nas planícies laterais ao corpo d?água e os depósitos heterolíticos, próximos à desembocadura deste, junto ao mar, em águas salobras. O contexto das paleoicnocenoses A e B e seus vínculos faciológicos sugerem representar, respectivamente, uma Icnofácies Scoyenia atípica e uma Icnofácies Cruziana empobrecida. De acordo com o registro global, a presença de G. cooperi, M. varia, T. pollardi e T. itararensis n. isp. nos ritmitos permitem supor uma idade Carbonífero Superior para esses depósitos.
The ichnotaxonomic review of the trace fossils from Itararé Group (Paraná Basin, south of Brazil) in the Rio Grande do Sul State (southernmost Brazil) showed the presence of an ichnofauna dominated by arthropod trackways. Resting traces and intrastratal trails also made by arthropods and shallow burrows produced by soft-bodied organisms are subordinated, as well as a Chondrites-Planolites-Palaeophycus composite ichnofabic. Two new ichnospecies were diagnosed, Cruziana intermittens n. isp. e Tonganoxichnus itararensis n. isp. Two ichnocoenoses were differenciated: (i) Paleoichnocoenosis A, bearing arthropod trackways, resting traces, intrastratal trails and shallow burrows, related to the rhythmite facies; and (ii) Paleoichnocoenosis B, joining exclusively deeper burrows, related to the heterolithic deposit facies. Four distinct suites were observed in Paleoichnocoenosis A: (i) MP suite, having Maculichna varia, Protichnites isp., Diplichnites gouldi and Diplopodichnus biformis, with Kouphichnium isp. subordinated, and related to the rhythmites type A; (ii) HT suite, composed of Helmithoidichnites tenuis and Treptichnus pollardi, with Nereites isp. and Tonganoxichnus itararensis n. isp. subordinated, related to the rhythmites type B; (iii) CR suite, bearing Cruziana problematica, C. intermittens n. isp., Rusophycus carbonarius and Gluckstadtella cooperi, with H. tenuis subordinated, related to the rhythmites type C; and (iv) Dg suite, monospecific to Diplichnites gouldi, superimposed to the CR suite, in palimpsest preservation. The Paleoichnocoenosis B is formed by a composite ichnofabric of Chondrites and Planolites (deeper tier), and Palaeophycus (shallow tier). The recorded ichnological signatures suggest an estuarine, fjord-like depositional setting, the proximal zone extending to ENE (Cachoeira do Sul region) and the distal zone reaching the SSW (south of São Gabriel-southwest of Lavras do Sul). The rhythmites type B are concentrated in the proximal zone, the rhythmites type A and C, in the marginal plains, lateral to the main body water, and the heterolithic deposits characterize the estuary mouth, opening to the sea, under brackish water conditions. The ichnological and faciological characteristics of the paleoichnocoenoses A and B reveal the existence of an atypical Scoyenia Ichnofaceis and an impoverished Cruziana Ichnofacies, respectively, in the studied deposits. According to the global record, the presence of G. cooperi, M. varia, T. pollardi and T. itararensis n. isp. in the rhythmites allows to infer an Upper Carboniferous (Pennsylvanian) age to these rocks.
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Fumes, Regiane Andrade [UNESP]. "Modelagem metamórfica e geotermobarometria de elementos traço em metapelitos e quartzitos: exemplo de Nappe de Luminárias-MG." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/148605.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A Nappe Luminárias corresponde a uma estrutura alongada de orientação NNE-SSW com cerca de 40 km de extensão, situada na porção sul do Orógeno Brasília (idade neoproterozoica), bordejando o Cráton do São Francisco. Tal estrutura é composta majoritariamente por metapelitos e quartzitos do Grupo Carrancas. O presente trabalho foca na caracterização metamórfica de metapelitos e quartzitos do Grupo Carrancas na Nappe Luminárias. Para tal, utiliza-se modelagem metamórfica através de pseudosseções (THERMOCALC), química mineral e os geotermômetros Zr em rutilo e Ti em quartzo. Com base na mineralogia e nas relações texturais e estruturais observadas em lâmina, foram identificadas paragêneses distintas nas porções norte, centro-norte e sul da Nappe Luminárias. Na porção norte, a paragênese é Cld+Chl+Ky+Rt+Qtz+Ms. Na porção centro-norte, ocorre a paragênese St+Grt+Rt+Qtz+Ms, com biotita, clorita e ilmenita retrometamórfica. A assembleia de pico metamórfico registrada nas rochas da porção sul é Grt+Ky+St+Rt+Qtz+Ms com biotita, clorita e ilmenita retrometamórfica. Os resultados indicam a presença de um gradiente metamórfico com condições variando de fácies xisto-verde na porção norte (560˚C e 10kbar) e centro-norte (610˚C e 12,5kbar) a fácies anfibolito / eclogito na porção sul (630˚C e 15kbar). As rochas metapelíticas da Nappe de Luminárias evoluíram através de trajetórias P-T-t horárias, que indicam aquecimento seguido de uma forte descompressão. Análises de elementos traço em grãos de rutilo derivados de quartzito indicam que os mesmos podem ser utilizados para cálculo de temperatura utilizando-se o geotermômetro Zr no rutilo. Todavia, os dados indicam que a homogeneização, ou reequilíbrio, da concentração de Zr em rutilos detríticos em quartzitos ocorre em temperaturas mais elevadas que nos metapelitos, em torno de 580˚C. Não foi observada sillimanita nas rochas estudadas. Estes dados colocam em dúvida a extensão da Zona de Interferência entre as Faixas Brasília e Ribeira até a região de Luminárias. Além disso, os dados de modelagem do presente trabalho mostram que seria necessária descompressão isotérmica de aproximadamente 8 kbar para a cristalização de sillimanita, o que é incompatível com a superposição da Faixa Ribeira sobre a Faixa Brasília, que levaria a um soterramento ainda maior das unidades.
The Luminárias Nappe is a 40 km long, NNE-SSW elongated structure, located in the southern portion of the Neoproterozoic Brasília Orogen, which borders the São Francisco Craton (Minas Gerais, Brazil). It is composed of high aluminium metapelites and quartzites from the Carrancas Group. The present work focuses on the metamorphic characterization of the metapelites and the quartzites of the Luminárias Nappe by means of pseudosection modelling, mineral chemistry and the Zr-in-rutile thermometer. In the northern portion, the paragenesis is Cld + Chl + Ky + Rt + Qtz + Ms. In the center-north portion, the paragenesis is St + Grt + Rt + Qtz + Ms, with retro-metamorphic biotite, chlorite and ilmenite. The metamorphic peak assembly recorded in rocks from the southern portion is Grt + Ky + St + Rt + Qtz + Ms with retro-metamorphic biotite, chlorite and ilmenite. Results indicate the presence of a metamorphic gradient with conditions increasing from green-schist facies in the northern portion (560˚C and 10kbar) and center-north (610˚C and 12,5kbar) to amphibolite / eclogite facies in the southern portion (630˚C and 15kbar). Metapelitic rocks of the Luminárias Nappe followed a clockwise P-T-t path, characterised by an initial heating stage that is followed by strong decompression. Analyses of trace elements in rutile grains derived from quartzite indicate that they can be used for temperature calculation using the geothermometer Zr in rutile. However, the data shows that the homogenisation, or reequilibration, of the Zr content detrital rutile in quartzites occurs at higher temperatures than in the metapelites, at about 580˚C. No sillimanite has not been described in the studied rocks. Therefore, it suggests that the Interference Zone between the Brasília and Ribeira belts does not extent to the Luminárias Nappe region. In addition, our modelling shows that it would be require an isothermal decompression of approximately 8 kbar for the crystallization of sillimanite, which is incompatible with the overlapping of the Ribeira Belt over the Brasilia Belt, which would lead to an even greater burial of the units.
FAPESP: 2015/05230-0
FAPESP: 2015/07750-0
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Tokushige, Yuki. "Random Walks on random trees and hyperbolic groups: trace processes on boundaries at infinity and the speed of biased random walks." Kyoto University, 2019. http://hdl.handle.net/2433/242580.
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Pratscher, Jennifer [Verfasser], and Ralf [Akademischer Betreuer] Conrad. "Investigation of microbial groups involved in the uptake of atmospheric trace gases in upland soils / Jennifer Pratscher. Betreuer: Ralf Conrad." Marburg : Philipps-Universität Marburg, 2011. http://d-nb.info/1013255461/34.
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Schwarzenberger, Fabian. "The Integrated Density of States for Operators on Groups." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-123241.
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This thesis is devoted to the study of operators on discrete structures. The operators are supposed to be self-adjoint and obey a certain translation invariance property. The discrete structures are given as Cayley graphs via finitely generated groups. Here, sofic groups and amenable groups are in the center of our considerations. Note that every finitely generated amenable group is sofic. We investigate the spectrum of a discrete self-adjoint operator by studying a sequence of finite dimensional analogues of these operators. In the setting of amenable groups we obtain these approximating operators by restricting the operator in question to finite subsets Qn , n ∈ N. These finite dimensional operators are self-adjoint and therefore admit a well-defined normalized eigenvalue counting function. The limit of the normalized eigenvalue counting functions when |Qn | → ∞ (if it exists) is called the integrated density of states (IDS). It is a distribution function of a probability measure encoding the distribution of the spectrum of the operator in question on the real axis.
In this thesis, we prove the existence of the IDS in various geometric settings and for different types of operators. The models we consider include deterministic as well as random situations. Depending on the specific setting, we prove existence of the IDS as a weak limit of distribution functions or even as a uniform limit. Moreover, in certain situations we are able to express the IDS via a semi-explicit formula using the trace of the spectral projection of the original operator. This is sometimes referred to as the validity of the Pastur-Shubin trace formula.
In the most general geometric setting we study, the operators are defined on Cayley graphs of sofic groups. Here we prove weak convergence of the eigenvalue counting functions and verify the validity of the Pastur-Shubin trace formula for random and non-random operators . These results apply to operators which not necessarily bounded or of finite hopping range. The methods are based on resolvent techniques.
This theory is established without having an ergodic theorem for sofic groups at hand. Note that ergodic theory is the usual tool used in the proof of convergence results of this type.
Specifying to operators on amenable groups we are able to prove stronger results. In the discrete case, we show that the IDS exists uniformly for a certain class of finite hopping range operators. This is obtained by using a Banach space-valued ergodic theorem. We show that this applies to eigenvalue counting functions, which implies their convergence with respect to the Banach space norm, in this case the supremum norm. Thus, the heart of this theory is the verification of the Banach space-valued ergodic theorem. Proceeding in two steps we first prove this result for so-called ST-amenable groups. Then, using results from the theory of ε-quasi tilings, we prove a version of the Banach space-valued ergodic theorem which is valid for all amenable groups.
Focusing on random operators on amenable groups, we prove uniform existence of the IDS without the assumption that the operator needs to be of finite hopping range or bounded. Moreover, we verify the Pastur-Shubin trace formula. Here we present different techniques. First we show uniform convergence of the normalized eigenvalue counting functions adapting the technique of the Banach space-valued ergodic theorem from the deterministic setting.
In a second approach we use weak convergence of the eigenvalue counting functions and additionally obtain control over the convergence at the jumps of the IDS. These ingredients are applied to verify uniform existence of the IDS.
In both situations we employ results from the theory of large deviations, in order to deal with long-range interactions.
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Fischer, Wolfgang. "Approche expérimentale du fractionnement magmatique et exemples de redistributions hydrothermales des éléments du groupe du platine (EGP)." Phd thesis, Grenoble 1, 1988. http://tel.archives-ouvertes.fr/tel-00691647.
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L'étude des processus de différenciation des EGP entreprise dans ce travail, nécessite leur dosage à des teneurs d'ultra-traces. Une méthode analytique de dosage a été développée. Elle met en oeuvre une extraction et une préconcentration basée sur une coprécipitation des EGP avec le sélénium et le tellure. L'analyse est effectuée par absorption atomique au four graphite. Les taux d'extraction, varient de 90 à 100 % pour Pt, Pd, Ru, Rh, et Au, et les limites de détection sont de l'ordre de 0,5 ppb . Les distributions des EGP observées dans les roches magmatiques, ont conduit à la distinction de deux groupes, l'un nommé IEGP ( Ir, Ru, Os) et un autre PEGP (Pt, Pd, Rh et Au). Les éléments du premier groupe sont exprimés sous forme de minéraux et se trouvent quasi exclusivement en inclusions au sein des cristaux de chromite . Par contre ceux du second se concentrent dans les sulfures de métaux de base (pentlandite, chalcopyrite). Ces associations suggèrent un rôle important de la fS2. et de la f02. dans le fractionnement des EGP. L' approche expérimentale de l'influence de ces deux paramètres, sur la solubilité d'un élément de chaque groupe, Ir et Pt, dans un bain silicaté à composition basaltique .( T= 1430° C), met en évidence, une diminution importante de la solublité de Ir avec une augmentation de la f02, ainsi qu'une forte augmentation de la solubilité du Pt pour une augmentation de la fs2. (fs2. > 1 0-2 at . ). Les résultats obtenus sont en parfait accord avec les observations microscopiques . De plus, ils nous ont conduit à rechercher l'origine des spectres en EGP très différents pour les chromitites de type stratiforme et podiforme, dans les conditions de formation de ces corps minéralisés . Nous proposons que ces conditions peuvent être comparées à un "système ouvert" pour les chromitites de type podiforme et à un '*système clos" , c' est-à-dire beaucoup plus confiné, pour les chromitites stratiformes. Dans ce modèle , nous confirmons l'importance de l'apparition de la saturation en soufre, sur le fractionnement des EGP, et montrons que ce dernier est à relier à l'évolution de la capacité en soufre du magma. De même, l 'étude de la distribution des EGP dans des roches ou phases minérales formées lors de la serpentinisation et la listwaenitisation des roches ultrabasiques mantelliques du complexe ophiolitique de Bou-Azzer (Maroc) a permis de mettre en évidence des phénomènes de fractionnement des EGP. Ce fractionnement se traduit par de nouveaux spectres en EGP attribués à des mobilités variables des EGP au cours des deux processus d'alteration postmagmatique. De Plus, les résultats obtenus montrent la faible solubilité de Pt ,Pd et Rh, par rapport à Au, dans les fluides hydrothermaux riches en. CO, As, Bl, ... , pour des T° de 150 à 300°C, ayant conduit , à la formatlon des concentrations en Au et Co dans les listwaenltes. Enfin, l 'étude des fractions de minéraux lourds , recueillis dans les alluvions de la Basse-Durance (France , a permis de mettre en évidence une paragenese complexe en MGP, avec comme minéral prédominant l' isoferroplatlne (Pt3Fe) . Une origine industrielle ou météoritique de ces paillettes est à rejeter . Les caractéristiques morphoscopiques observées suggèrent un long transport de ces paillettes. Le bassin versant de la haute Durance apparait comme une zone à fort potentiel pour contenir les roches sources de ces paillettes .
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Murisa, Tendai. "An analysis of emerging forms of social organisation and agency in the aftermath of 'fast track' land reform in Zimbabwe." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1003081.
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The fast track land reform programme resulted in a fundamental reorganisation of rural relations in Zimbabwe, changing the landscape in an irreversible way with people from diverse backgrounds converging on former white-owned farms. This thesis tells the story of how the newly resettled land beneficiaries are organising themselves socially in response to various economic challenges. It makes a contribution towards understanding how redistributive land reforms and local government restructuring influence rural social organisation and agency. Furthermore the study examines local perceptions on the meanings of the „farm‟ and „land redistribution‟. An utterance by one war veteran “what used to be your farm is now our land and you are free to take your farm but leave our land” provides an alternative rendition to contestations of restitution versus a purely farm productionist discourse. The study, through an analysis of primary and secondary data, provides a fresh understanding of the social outcomes of fast track. It traces the evolution of land and agrarian reforms in post-independence Zimbabwe and the political and social economic context that led to „fast track‟. Through an analysis of field findings the thesis is able to define the dominant social groups that were resettled during fast track and the challenges they face in utilising the land. The findings show that the majority of the land beneficiaries were from the customary areas, with limited agricultural experiences. Local cooperation within informal networks and local farmer groups has been identified as one of the ways in which social reproduction is being organised. These groups are responsible for enhancing production capacity but they face a number of constraints. The study derives its theoretical foundation from the post 1980s debates on rural society dominated by Mafeje (1993, 2003), Rahmato (1991) and Mamdani (1996). The debates centred on how institutions of inclusion, authority and cooperation such as the lineage groups, local farmer groups and traditional authority remain relevant in the organisation of post-independent rural African society especially in a context of increased commoditisation of rural relations of production. Using theoretical insights derived from analysing the role of the lineage groups in the allocation of critical resources such as land and the influence of traditional authority (indirect rule) as a form of local government, the study examines how social organisation is emerging in areas where neither lineage nor traditional authority are not dominant. The thesis of rural cooperation through local groups as advanced by Rahmato (1991) and Moyo (2002) provides partial insights into the response mechanisms that land beneficiaries invoke in this instance. It is not necessarily an autonomous space of organisation but rather the state is actively involved through various functionaries including extension officers who invariably advance a very productionist approach. The state‟s monopoly through its local functionaries hides its political cooptation effect by emphasising organisation for production without questioning the manner in which that production is externally controlled through limited rights over land, the state‟s monopoly over inputs supply and markets for commodities. Whilst land reform has been driven by local participation through land occupations, local government reform has been technocratically determined through Ministerial directives. There is however little innovation in the form of local government that is being introduced. It expands the fusion of authority between elected Rural District Councils and unelected traditional authority functionaries. The forms of social organisation and agency that have emerged remain subordinated to the state with no links to other networks of rural producers‟ associations and urban civil society organisations. These developments form part of a longheld tradition within the Zimbabwean state where the legitimacy of local organisation and authority is usurped to service the interests of the state. Thus whilst land reform has to a certain extent accommodated the majority poor, the ensuing local government and agrarian reforms are more focused on limiting their participation in broader processes of political engagement around distribution and accumulation and their own governance.
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Ghasabyan, Levon. "Use of Serpent Monte-Carlo code for development of 3D full-core models of Gen-IV fast-spectrum reactors and preparation of group constants for transiet analyses with PARCS/TRACE coupled system." Thesis, KTH, Fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118072.
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Smilek, Krista R. "Using Ichnology and Sedimentology to Determine Paleoenvironmental and Paleoecological Conditions of a Shallow-Water, Marine Depositional Environment: Case Studies from the Pennsylvanian Ames Limestone and Modern Holothurians." Ohio : Ohio University, 2009. http://www.ohiolink.edu/etd/view.cgi?ohiou1250003072.
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Do, Viet Cuong. "Le lemme fondamental métaplectique de Jacquet et Mao." Phd thesis, Université de Lorraine, 2012. http://tel.archives-ouvertes.fr/tel-00821520.
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On démontre dans le cas de caractéristique positive un lemme fondamental conjecturé par Jacquet et Mao pour le groupe métaplectique. On utilise les arguments de B.C. Ngo pour le lemme fondamental de Jacquet-Ye (B.C. Ngo, 1999) [[6]] et une étude géométrique de lʼextension métaplectique.
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Gangloff, Sophie. "Evaluation of the mechanisms of trace elements transport (Pb, Rare Earth Elements,... ) and the elemental and isotopic fractionation (Ca and Sr) at the interface water-soil-plant." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAH002/document.
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Ce travail est axé sur l’étude d’un profil de sol et des solutions de sol prélevés sur une parcelle expérimentale couvertes d’épicéas. Tous ces échantillons proviennent du Bassin Versant du Strengbach (Observatoire HydroGéochimique de l’Environnement – OHGE), ont été échantillonnés à différentes profondeurs (5, 10, 30 et 60 cm) et durant la période comprise entre 2009 et 2013.Les caractérisations des extraits des sols par spectroscopie Infra-Rouge ont permis de mettre en évidence les modifications des groupements fonctionnels organiques avec la profondeur et que ces modifications ont une forte incidence sur le comportement des cations (majeurs et traces) dans le sol. Des expérimentations d’ultra-filtration ont permis d’identifier les flux colloïdaux et dissous du carbone organique ainsi que ceux des éléments majeurs et traces présents dans les solutions de sol. L’utilisation conjointe des traceurs isotopiques (87Sr/86Sr et δ44/40Ca) et chimiques (Terres Rares) ont mis en évidence des processus ayant lieu aux interfaces eau-sol-plante, comme le prélèvement racinaire ou l’altération des solsThis work is focused on the study of a profile of soil and soil solutions collected on an experimental plot covered with spruce. All these samples come from the watershed of the Strengbach (environment - OHGE Hydrogeochimique Observatory), were sampled at different depths (5, 10, 30 and 60 cm) and during the period between 2009 and 2013. Characterizations of soil extracts by infrared spectroscopy allowed to highlight changes in the organic functional groups with depth and that these changes have a significant impact on the behaviour of the cations (major and trace) in the soil. Ultrafiltration experiments helped to identify flows of colloidal and dissolved organic carbon as well as those of the major and trace-element present in soil solutions. The joint use of isotope tracers (87Sr / 86Sr and δ44 / 40 Ca) and chemical (Rare Earth Elements) have highlighted processes taking place at the water-soil-plant interface, as the uptake by root or soil alteration
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Trommetter, Guillaume. "Développements analytiques et d’échantillonneurs passifs appliqués aux terres rares et platinoïdes : application aux systèmes aquatiques anthropisés." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R051.
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Les écosystèmes aquatiques sont des systèmes fragiles, vitaux pour la biosphère et cependant soumis à de nombreuses pressions anthropiques, parfois importantes. Actuellement, des méthodes fiables permettent la quantification et l’étude du devenir des éléments traces métalliques (Pb, Zn, Cd, etc.) et bon nombre de micropolluants organiques dans les eaux et les sédiments. Pour d’autres éléments comme les terres rares ou les platinoïdes, de plus en plus utilisés par l’industrie, leur quantification demeure en revanche plus complexe, voire encore incertaine du fait de leurs très faibles concentrations. Leur quantification est pratiquement impossible sans l’utilisation de techniques de préconcentration ou le développement de méthodes analytiques spécifiques pour réduire les interférences spectrales liés à des interférents présents en forte concentration dans l’environnement. Ce travail de recherche a permis (i) de quantifier précisément ces éléments par spectrométrie de masse à plasma par couplage inductif combiné à l’utilisation d’une cellule de collision/réaction en choisissant judicieusement le gaz et son flux appliqué dans la cellule ; (ii) de préconcentrer in situ puis de déterminer des concentrations variant du pg L-1 au ng L-1 pour les éléments du groupe du platine, dans des zones impactées par les activités humaines (lessivages des routes, rejets de médicaments à base de Pt), en développant des techniques d’échantillonnage passif dites « Diffusive Gradients in thin films (DGTs) » basées sur l’utilisation de deux résines différentes, et (iii) de mieux comprendre comment certains de ces éléments peuvent servir de traceurs de rejets urbains notamment liés aux stations de traitement des eaux usées contenant des rejets domestiques et hospitaliers, en complément des traceurs habituellement utilisés. Pour ce faire, la Marque Rivière a servi de site pilote pour cette étude prospective au cours d’une période d’étiage. Ces études ont permis de déterminer les concentrations actuelles des terres rares et platinoïdes dans des milieux fortement impactés par les activités humaines rendant possible le suivi de leur évolution et l’évaluation de leur potentiel impact dans le futurAquatic ecosystems are fragile systems, vital for the biosphere and yet subject to numerous, sometimes significant, anthropogenic pressures. Currently, reliable methods allow the quantification and study of the fate of metallic trace elements (Pb, Zn, Cd, etc.) and many organic micropollutants in water and sediments. For other elements such as rare earths or platinum group elements, which are increasingly used by industry, their quantification remains more complex and even uncertain due to their very low concentrations. Their quantification is practically impossible without the use of preconcentration techniques or the development of specific analytical methods to reduce the spectral interferences linked to interferents present in high concentrations in the environment. This research work has allowed (i) to quantify precisely these elements by inductively coupled plasma mass spectrometry combined with the use of a collision/reaction cell by judiciously choosing the gas and its flow applied in the cell ; (ii) to preconcentrate in situ and then determine concentrations ranging from pg L-1 to ng L-1 for platinum group elements, in areas impacted by human activities (road leaching, Pt-based drug releases), by developing passive sampling techniques called "Diffusive Gradients in thin films (DGTs)" based on the use of two different resins, and (iii) to better understand how some of these elements can be used as tracers of urban discharges, particularly in connection with wastewater treatment plants containing domestic and hospital discharges, in addition to the tracers usually used. To this end, the Marque River served as a pilot site for this prospective study during a period of low water levels. These studies made it possible to determine the current concentrations of rare earths and platinum in environments heavily impacted by human activities, making it possible to monitor their evolution and evaluate their potential impact in the future
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Vigneron, Francois. "Localisation et décroissance des champs de la mécanique des fluides et des plasmas. Espaces fonctionnels associés à une famille de champs de vecteurs." Phd thesis, Ecole Polytechnique X, 2006. http://tel.archives-ouvertes.fr/tel-00136144.
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La première partie est consacrée à l'étude du comportement asymptotique des solutions de Navier-Stokes incompressible à l'infini de la variable d'espace. On obtient des résultats optimaux de propagation de la décroissance en terme d'espaces à poids, ainsi qu'un developpement asymptotique de la vitesse et de la pression analogue à la loi de Bernoulli. La théorie s'étend à un modèle de la MHD.La seconde partie est consacrée à l'étude des espaces de Sobolev associés à une famille de champs de vecteurs, de type sous-elliptique. Les principaux résultats sont la description des régularités fractionnaires avec la distance de Carnot, la démonstration d'inégalités de Hardy et, dans le cas du groupe de Heisenberg, la théorie des traces sur une hypersurface caractéristique générique.