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Sugiyama, Takemi. "Two times two." Thesis, Virginia Polytechnic Institute and State University, 1992. http://hdl.handle.net/10919/52124.
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Paiva, Rafael Rothganger de. "Two-photon two-atom processes." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-24102013-080238/.
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In the atomic, molecular, optical physics field, processes involving two photons are very well understood and used in applications ranging from spectroscopy to laser cooling technics. In this thesis is presented the study and experimental realization of two two-photon processes. Using sodium atoms trapped in a magnetic optical trap we could demonstrate two-photon cooperative absorption, and that the creation of a molecular bound state using only light fields, or photonic bound state, is possible. Two-photon cooperative absorption, very common in solid-state physics, is a process where a pair of atoms initially in the ground state is excited to the double excited state, via absorption of two photons with frequecy that is not ressonant with any excited state. Its experimental realization with cold atoms may open new and exciting possibilities to better understand nonlinear effects, and it is a new way to create correlated atoms and photons in cold atomic physics. This absorption was observed by ionization of the pair after the excitation. A simple model that considers only dipole-dipole interactions between the atoms allows us to understand the basic features observed in the experimental data. A photonic bound state uses two photons to create the two basic features of a molecular bound state: a repulsive part and an attractive part. A blue photon, blue detuned from the atomic transition, connects the ground state of the pair to the repulsive part of the first excited molecular state 1, and a red photon, red detuned from the atomic transition, connects the connects the ground state of the pair to the attractive part of the first excited molecular state. In the dressed state picture, when the light fields are strong, this three-states-two-photon system creates adiabatic bound potentials that are strongly dependent of the photon properties. Using a theoretical model we could study how this bound energies changes when we change the photon properties, and the experimental data shows that this photos are indeed dressing the potentials with a efficiency that would enable the creation of photonic molecules.<br>No campo da física atômica, molecular e ótica processos envolvendo dois fótons são bem compreendidos e usados em diversas aplicações. Nesta tese apresentamos o estudo e a realização experimental de dois processos de dois-fótons. Usando átomos de sódio aprisionados em uma armadilha magneto ótica, demonstramos a absorção cooperativa de dois fótons e que a criação de um estado ligado molecular usando somente campos de luz, ou estado ligado fotônico, é possível. Absorção cooperativa de dois fótons, um processo bem comum em física de estado sólido, acontece quando um par de átomos inicialmente no estado fundamental é excitado para o estado duplamente excitado, via absorção de dois fótons de frequência não ressonante com a dos estados excitado. A realização experimental deste processo em um sistema de átomos frios pode abrir novas, e excitantes possibilidades para entender melhor processos não lineares, e é um novo método de criar átomos e fótons correlacionados. Essa absorção foi observada através da ionização do par depois da absorção, e um modelo simples que considera somente interação dipolo-dipolo entre os dois átomos nós ajuda entender as características básicas dos dados obtidos. Um estado ligado fotônico usa dois fótons para criar as duas características básicas dos estados ligados moleculares: a parte repulsiva e a parte atrativa. Um fóton azul, deslocado para o azul da transição atômica, conecta o estado fundamental do par a parte repulsiva do primeiro estado excitado molecular 1, e um fóton vermelho, deslocado para o vermelho da transição atômica, conecta o estado fundamental a parte atrativa do deslocado para o azul da transição atômica. No contexto de estados vestidos, quando os campos de luz são intensos, esse sistema de três estados e dois fótons cria potenciais ligantes adiabáticos que são fortemente dependentes das propriedades desses fótons. Usando um modelo teórico para esses potenciais pudemos estudar como é essa dependência, com as características do fótons, e os dados experimentais mostram que esses fótons estão de fato vestindo os estados com uma eficiência que viabiliza a criação de moléculas fotônicas.
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Choi, Ho-Kyung. "Two for One, One for Two." Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc278117/.
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The film is about three young Korean-American adults who have adapted to American society while retaining certain aspects of Korean culture in their lives. To expose their intermingled behaviors and concepts, the film combines the observational format of a documentary with an information style employing family photos, home movie recordings, and interviews with the three subjects and their families. An accompanying production report describes the research process, pre-production, production, and post-production.
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Kunda, Wilkinson. "Two phase problems and two phase flow." Thesis, University of Hull, 1986. http://hydra.hull.ac.uk/resources/hull:5902.
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In section 1 of this thesis a two-dimensional mathematical model is used to investigate the circulation in a gas-bubble agitation system of a cylindrical vessel for the case of an orifice located at the centre of the base. The two-phase (liquid/gas) region is assumed to be confined to a cone-shaped region and is investigated using Wallis' Drift Flux Model. In the single-phase (liquid) region the turbulent Navier-Stokes equations, written in terms of the stream function, are used for the mathematical model. The analysis in the two-phase region yields the boundary conditions on the two-phase/single-phase boundary. The velocity field in the two-phase region is solved analytically giving results in closed form. A numerical algorithm is developed for calculating liquid flow in the single phase region, and numerical results are presented graphically in terms of the stream function. In section 2 two moving interface problems are investigated. Small time analytic solutions are found for three-dimensional inward solidification of a half space initially at fusion temperature in the first problem. In the second problem, perturbation solutions for melting of a cylindrical annulus with constant heat flux on inner surface are given. In both problems the interface immobilization technique is used. Interface locations at various times are calculated for the inward solidification problem and the results shown in three-dimensional graphs. First and second perturbation terms for the interface location are given for the second problem and graphs of each are presented for a particular case.
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Buchweitz, Augusto. "Two languages, two input modalities, one brain." Florianópolis, SC, 2006. http://repositorio.ufsc.br/xmlui/handle/123456789/89262.
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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão. Programa de Pós-Graduação em Letras/Inglês e Literatura Correspondente.<br>Made available in DSpace on 2012-10-22T18:45:53Z (GMT). No. of bitstreams: 0<br>O bilíngüe altamente proficiente é aquele que consegue processar duas línguas com sucesso e habilidade comparáveis. As línguas, por sua vez, têm na fala e na escrita duas modalidades de expressão diferentes em sua natureza. Nesse sentido, foram desenvolvidos dois experimentos com ressonância magnética funcional com os objetivos de investigar, primeiro, a compreensão por parte de bilíngües altamente proficientes falantes de português (L1) e inglês (L2) e, segundo, os efeitos da compreensão pela audição e pela leitura, em português, na ativação cerebral. Os resultados do primeiro experimento mostram ativação cerebral semelhante em português e em inglês. Entretanto, a comparação entre a ativação cerebral na segunda e na primeira língua também mostra que houve ativação de áreas pré-motoras e motoras do cérebro na L2 em comparação com L1. Por sua vez, os resultados do segundo experimento mostram que na compreensão pela audição, em comparação com a leitura, houve ativação bilateral do córtex temporal. Na leitura, em comparação com a compreensão pela audição, houve ativação do córtex occipital inferior esquerdo. Esses resultados indicam que, primeiro, há um esforço adicional na articulação e recuperação de informação na compreensão de L2 e, segundo, que as diferenças neuro-anatômicas entre a compreensão pela audição e pela leitura em português estão associadas aos efeitos do processamento da fala e da escrita per se, e não a efeitos associados a possíveis diferenças entre processos cognitivos. Os resultados destes experimentos contribuem para a investigação da cognição e da ativação cerebral em situações de compreensão bilíngüe e de compreensão pela audição e pela leitura.
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Boone, A. W. "Theory of two-photon and two-mode lasers." Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336042.
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Wang, Haiyan. "Two-stage logistics scheduling with two-mode transportation /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202003%20WANG.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.<br>Includes bibliographical references (leaves 59-61). Also available in electronic version. Access restricted to campus users.
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Park, Rohjoon. "Two-phase closed thermosyphon with two-fluid mixtures." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/7685.
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An experimental study was conducted to investigate the performance of stationary two-phase closed thermosyphons with two-fluid mixtures. Three mixtures were used as the working fluids: (1) water-ethanol, (2) water-ethyleneglycol and (3) water-glycerol. The results are presented to show the effects of ratio of two fluid component, mean operating temperature, different fluid mixtures, heat flux and inclination of the thermosyphon with respect to the direction of the gravitational force. An analytical model is presented to predict the variation of the overall heat transfer coefficients with mole fraction for the thermosyphon with binary mixtures. A good agreement between the prediction by the model and the experimental results was obtained.
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Jamieson, Mitton Judith. "Two voices." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65202.pdf.
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Sherman, Donald Brad Sherman Donald Brad. "Two compositions /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/15507.
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Ulman, Erik Ulman Erik Heinowitz R. Cole. "Two compositions /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9989254.
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Thesis (Ph. D.--Music)--University of California, San Diego.<br>Vita. Music for solo piano, and a chamber opera scored for soprano and baritone soloists, flute, trombone, piano, electric organ, and percussion (1 performer). Includes commentary by the composer on the 2 compositions. Includes bibliographical references.
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Prosser, Christopher Skinner 1978. "Two Trees." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/11048.
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1 score (viii, 79 p.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>The Two Trees is a fifteen-minute musical composition for orchestra. Inspired by
William Butler Yeats' poem of the same name, the piece depicts the images described by
Yeats' poetic narrative through a double theme and variations form consisting of two
contrasting themes that are related, one ascending and one descending. Each theme
represents one of the two contrasting sections of the poem and is followed by a set of five
variations for a total of ten. Since the rhyme scheme of each section of the poem is divided
into five phrases of four lines, each musical variation corresponds to four lines of text.<br>Committee in Charge:
David Crumb, Chair;
Robert Kyr;
Jack Boss
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Maher, Kimberly A. "Two lives." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/1358.
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Dominick, Richard L. "Two libraries." Thesis, Virginia Polytechnic Institute and State University, 1993. http://hdl.handle.net/10919/53346.
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The two libraries and studies that follow are the products of an exploration into the problematic relation of man to nature. The work specifically examines the fact that while we are unquestionably a part of nature we are, at the same time, separated from it by our self-awareness. We exist as both symbolic and physical beings. As Christian Norberg-Schulz notes, we are precariously situated between the earth and the sky. Focusing on the fundamental elements of light and shadow, the projects explore the issues of separation and inclusion. It is hoped that a glimpse of the innate terror, wonder and beauty of our daily existence may be revealed.
The work deals specifically with the making of layers and edges while accentuating spatial flow and continuity. The desire is to bring the library patron into close contact with nature while simultaneously emphasizing a profound separation. Complementary to this is an interest in highlighting a perception of leaving and returning. Reading involves leaving one's present awareness in order to pursue another that is revealed through the pages of a book. One may gain a new perspective on the world through one's literary ventures. Regardless, however, of the distance one may symbolically travel one must always return to the immediacy of one's present situation. Seemingly endless possibility is balanced by the confinement imposed by one's own mortality.
In each project the visitor moves through layers of light and space, crossing a small, enclosed courtyard before reaching the main body of the library. Once inside, he regains a view of the courtyard as he sits down by the window to read. By emphasizing distance through layering, the visitor is withdrawn from the hectic cityscape and focused on the subtle interplay of light and shadow on simple concrete walls and on the fluttering leaves and branches of a tree. It is hoped that by withdrawing the visitor from the city and reminding him of his peculiar relation to nature he may renew his awareness of the human condition.<br>Master of Architecture
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Mingin, Wendy E. "Two projects." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/46410.
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The purpose of this thesis is not to begin with a premise and follow it through, but to discover through two different projects to what extent architecture can be understood, and to examine those "tools" of architecture that turned inspiration and conception into projects with architectural qualities.<br>Master of Architecture
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Buick, Lorne G. "Two recitals." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27371.
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Malta, Rosa. "The Reading Room, Jacob Two-Two meets the Gap." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0003/MQ42330.pdf.
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Hart, John Walker. "SIMPLE TWO-SIDED RATIONAL VECTOR SPACES OF RANK TWO." The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-03102010-094108/.
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<p>The purpose of this thesis is to find sufficient conditions under which a non-commutative version of the polynomial ring in two variables exists. The non-commutative rings we construct are non-commutative symmetric algebras over a two-sided vector space. After reviewing the definition of a two-sided vector space and giving some examples, we briefly recall the theory of simple two-sided vector spaces. We then assume k is a field of characteristic zero and t is transcendental over k and we find sufficient conditions under which a simple k-central two-sided vector space V over k(t) has left and right dimension two. Given such a V, and letting <sup>*</sup>V and V<sup>*</sup> denote the left and right duals we find conditions under which (V<sup>i*</sup>,V<sup>(i+1)*</sup>,V<sup>(i+2)*</sup> ) has a simultaneous for all i, i an integer. This condition implies the non-commutative symmetric algebra over V can be constructed. We conclude by exhibiting a five-dimensional family of simple k-central two-sided vector spaces over k(t) of left and right dimension two who non-commutative symmetric algebras exist.</p>
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Traverso, Koroleff Pierina. "Two adolescent mothers, two bondings: What makes the difference?" Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/101618.
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A case study of two adolescent mothers of the same age is presented (17 years old) withwhich it is intended to explore the maternal representations and mother-baby interactions, that is, the different ways of “being with” a baby. The study pretends to discuss that it is not adolescent motherhood in itself a risk factor, but other mediating variables such as support network and the reflective function with which each young mother counts. Maternal repre- sentations were assessed through a semi-structured interview about maternal representations (Traverso, 2006) and the mother-infant interactions were measured and filmed through the Mother-Infant Global Ratings for two and four months (Murray, Fiori-Cowley & Cooper,1996).<br>Se presenta un estudio de caso de dos madres adolescentes de la misma edad (17 años), con el cual se intenta explorar las representaciones maternas y las interacciones madre-bebe, es decir, las distintas maneras de “estar con” el bebe. El estudio pretende discutir que la maternidad adolescente en sí misma no es un factor de riesgo, sino que otras variables moderadoras como la calidad de las redes de sostenimiento y la función reflexiva con que cada joven madre cuenta. Las representaciones maternas fueron evaluadas a través de una entrevista semi-estructurada sobre representaciones maternas (Traverso, 2006) y las interacciones madre-bebe fueron medidas y filmadas a través del Mother-Infant Global-Ratings para dos y cuatro meses (Murray, Fiori-Cowley & Cooper, 1996).
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Al, Rustamani Hind Abdul Wahed Hassen. "Characterisation of two constitutively expressed proteins in two trypanosomatid species." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321901.
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Masud, Bilal. "A model for systems of two quarks and two antiquarks." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316994.
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Zheng, Zhan. "Two-photon--two-atom excitation with quantum multimode light states." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066589/document.
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Deux photons - deux atomes (2P2A) excitation s’avère être un banc de test importantde propriétés optiques quantiques. Depuis 1980, on sait que la probabilité de transition2P2A peut être grandement améliorée en utilisant la source monochromatique cohérenteavec la présence d’interactions atomiques qui induisent un pic de résonance de 2P2A. En2004 , Muthukrishnan et al. sont trouvés une grande amélioration de la transition ainsique d’une résonance de 2P2A, quand une source de deux photons intriqués, provenant dela radiation d’un atome cascade à trois niveaux, interagit avec les deux atomes différentsde l’ interaction. Leur conclusion est que : dans certaines situations, l’intrication peutremplacer un vrai hamiltonien d’interaction, qui est une déclaration de grande portée etune propriété importante liée à l’intrication. Ce phénomène mérite plus d’attention et defavoriser la compréhension<br>Two-photonÐtwo-atom (2P2A) excitation turns out to be an important test bench of quantum optical properties. In 2004, Muthukrishnan et al. announced a great enhancement of the transition at 2P2A resonance, when an entangled two-photon state, coming from a three-level cascade, interacts with two non-interacting atoms. Their conclusion: in some situations, entanglement can replace a real interaction Hamiltonian, reveals an important property related to entanglement. In this thesis, We study in detail the efficiency of various multimode two-photon states of light to induce the simultaneous excitation of two atoms of different kinds under 2P2A resonance condition. We find that several separable, correlated states, produced either by an atomic cascade or parametric down-conversion, or even appropriate combinations of coherent states, have comparable efficiencies as the photon state produced by an atomic cascade. We conclude that the true physical origin of the enhancement is the frequency anti-correlations, neither the temporal correlations, time ordering, nor entanglement. To present, we are not sure whether or not the enhancement is a quantum effect. We also studied: 1. the optimized 2P2A transition probability for a given photon spectrum; 2. the influence coming from finite lifetimes of the excited detecting atoms; 3. the 2P2A transition probability in the presence of atomic interaction
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Lilly, Stephen Frank. "Two for orchestra." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/246.
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Thesis (D.M.A.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Music. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Hanafford, John, and res cand@acu edu au. "Two Australian Pilgrimages." Australian Catholic University. School of Arts and Sciences, 2001. http://dlibrary.acu.edu.au/digitaltheses/public/adt-acuvp5.19072005.
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In a time of rapid social change pilgrimages are resurfacing as significant and visible social phenomena. Australia has historically been noted as a very secular society but in recent years there has been some scholarly attention to forms of spirituality outside of the orthodox, Church religion. In matters of national identity and commitment to place it is argued that there could be an upsurge in spirituality, in contrast to the decline of those practising formal religion. In this dissertation it is argued that two journeys undertaken by contemporary Australians can be considered true pilgrimages with spiritual dimensions and are therefore part of a growing spirituality apart from formal Church. A survey of the theological and anthropological literature about pilgrimages allowed the development of an eight-point frame of criteria that could be used as a standard against which an assessment of contemporary journeys could be made. Pilgrimage is a non-local physical journey to a historically and or mythically significant site or shrine that embodies the centre of a persons most valued ideals. These ideals may or may not be theistic but must be portrayed within the limits of the culture. The shrine casts an image of the culture and has an expert shrine custodian, but has the capacity to absorb a multiplicity of discourses. Pilgrims go to a shrine to experience the place of past events, take home spiritual traces and to model a changed or improved future. In order to apply this frame to two Australian journeys, field trips were made to the plaster image of Mary at Our Lady of Yankalilla Church in South Australia and to Gallipoli in Turkey around the Anzac Day commemorations in 2000. Participant observations and interviews with six key informants, when considered in association with the historical context and media reports, provided thick description of the behaviour at the journey destinations and insight into participants experiences, motives and understandings. Both journeys, the sacred and ostensibly secular, satisfied the frame of criteria for a pilgrimage. Furthermore they may also exemplify some features that are distinctively Australian, in that in these pilgrimages spontaneity and egalitarianism jostled against bureaucratic structures and national hierarchies.
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Tillman, Stephanie. "Between Two Worlds." TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1506.
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“Original Sin”—evocative and powerful words, but what if they were applied to one of the world’s most popular fairy tales? This thesis explores Snow White in the context of the Seven Deadly Sins and the grand fall of Adam and Eve. The forbidden fruit manifests itself in different ways, pulling the prim and proper princess into places she never could have imagined. But what of the Wicked Queen, here known as Lilith? She too feels the bite of the world’s sick sense of humor, exacting revenge on those who have wronged her. Are these poems about them? Or are they about the author? Perhaps they are both: the innocent children learn quickly of life’s cruelty, handling it with equal parts grace and selfishness. Dive into the minds of Lilith and Snow White as they explore what it means to be themselves in a world that doesn’t care if they end up happy.
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Sinclair, Alex. "Two-directional synthesis." Thesis, University of East Anglia, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429824.
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Asplund, Christian T. "Two chamber operas /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/15513.
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Xu, Ting. "Two-dimensional City." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491317866390447.
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Chad, Ben. "Two-point sets." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589611.
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This thesis concerns two-point sets, which are subsets of the real plane which intersect every line in exactly two points. The existence of two-point sets was first shown in 1914 by Mazukiewicz, and since this time, the properties of these objects have been of great intrigue to mathematicians working in both topology and set theory. Arguably, the most famous problem about two-point sets is concerned with their so-called "descriptive complexity"; it remains open, and it appears to be deep. An informal interpretation of the problem, which traces back at least to Erdos, is: The term "two-point" set can be defined in a way that it is easily understood by someone with only a limited amount of mathemat- ical training. Even so, how hard is it to construct a two-point set? Can one give an effective algorithm which describes precisely how to do so? More formally, Erdos wanted to know if there exists a two-point set which is a Borel subset of the plane. An essential tool in showing the existence of a two-point set is the Axiom of Choice, an axiom which is taken to be one of the basic truths of mathematics.
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Wiebe, Victor. "The development of two computerized study units, demonstrating two instruction theories." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0008/MQ52492.pdf.
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Hellmann, Isabell [Verfasser]. "The Mukai system of rank two and genus two / Isabell Hellmann." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1224270665/34.
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Hamilton, Lorna C. "Constructions of higher ability in two maintained and two independent schools." Thesis, University of Stirling, 2001. http://hdl.handle.net/1893/2610.
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This research is an exploration of constructions of ability, especially 'greater ability' within four Maintained and Independent case study schools in Scotland, from a variety of group perspectives. It seeks to illuminate the commonalties and differences between and within schools in individuals' implicit theories of ability and explores the possible implications of such constructs. An analysis of policy and political debate provided the starting point for this research. This led into the empirical work in four case study schools. Data were gathered from semi structured interviews with headteachers, principal teachers of English, Maths, Art and music, class teachers, parents and pupils. In addition, non-participant observation took place for each subject area and class. Multiple perspectives helped to create meaningful layers of perceptions of ability while also making it possible to analyse the complexity of values and beliefs within each class and school. The research found that there were distinctions to be made between schools in both sectors which reflected contrasting viewpoints, echoing 'communitarian concerns' and the 'culture of self interest' (Ball, 1997). However, the experiences, judgements and choices of individuals presented a more complex pattern in which contradictory beliefs could lead to experiences of dissonance in maintained schools and highlighted the importance of the negotiated ability constructs being brought to bear by individuals within institutions.
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Bardhan, Neelkanth Manoj. "Two-dimensional exploration of two-dimensional carbon : imaging and sensing applications." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103848.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>With the emerging need for advanced sensing and imaging capabilities in personalized healthcare, there has been motivation to develop new classes of nanomaterials; with performance vastly superior to existing technologies. In this work, we explore the one- and two-dimensional forms of carbon nanomaterials, namely, single-walled carbon nanotubes (SWNTs), and graphene derivatives (graphene oxide, or GO), for their remarkable potential in biomedical imaging and sensing. This thesis presents three functional applications, along with the necessary processing at the interface of nanotechnology and biomaterials required to achieve the desired set of properties enabling these applications. First, we attempt to address the rise in antibiotic-resistant bacterial infections by developing a nano-probe for targeted sensing, with potential for early, non-invasive diagnosis of infectious diseases through optical imaging. Using genetically engineered M13 bacteriophage, we synthesize biologically-functionalized, aqueous-dispersed SWNTs, for actively-targeted, modularly-tunable, high-contrast, highly-specific detection of deep-tissue pathogenic infections, at an order-of-magnitude lower dosage compared to other probes reported in literature. Second, we investigate the role of guided surgery in enhancing the survival lifespan of patients with gynecological cancers. We deploy a combination of targeted SWNT probes, along with a custom-designed real-time intraoperative imaging system, which offers sub-millimeter resolution at a sensitivity over 93%. Using image-guided surgery in a mouse model of ovarian cancer, compared to the control group receiving non-guided surgery we report improvement in the median survival by 40%, with large societal benefit expected upon clinical translation. Third, we develop a scalable, one-step mild thermal annealing treatment for enhancing the properties of graphene derivatives, with no chemical treatments involved, while preserving the rich oxygen framework in GO unlike current protocols used in literature. This treatment provides a handle to control the spatial distribution of oxygen functional groups on the graphene basal plane. Using nano-bodies decorated on our treated GO substrate, we report 38% increase in the efficiency of cell capture from whole blood, compared to conventional sensors using as-synthesized GO. Finally, we discuss challenges in moving the field forward, and provide a brief glimpse into the next-generation imaging technologies currently under development, which are generally applicable to a much broader class of materials.<br>by Neelkanth Manoj Bardhan.<br>Ph. D.
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Harvey, Joshua Thomas. "Stoichiometric Homeostasis in Two Native and Two Invasive South Dakotan Grasses." Thesis, South Dakota State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13807215.
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<p> Increased nutrient availability has been widely linked to the success of invasive plants, however a general mechanism explaining these observations is lacking. Stoichiometric homeostasis (<i>H</i>), which is the regulation of internal nutrient concentrations, has been used to explain changes in plant community diversity under alterations in nutrient availability. One hypothesis holds that plants with high regulation (larger <i>H</i>) decrease in abundance in nutrient enriched conditions but are stable in nutrient deficient and drought conditions, likely due to extensive root systems. Additionally, plants with low regulation (lower <i>H</i>) increase in abundance under nutrient enriched conditions but are sensitive to drought conditions. I tested the hypotheses that <i>H</i> would be higher in native grasses than in invasive grasses, that <i>H</i> would be modulated by environmental conditions, and that differences in <i>H</i> would be associated with differences in growth and biomass allocation. I calculated <i> H</i> and measured plant growth and growth traits in two native (<i> Pascopyrum smithii</i> and <i>Elymus canadensis</i>) and two invasive (<i>Bromus inermis</i> and <i>Agropyron cristatum </i>) grasses grown in two experiments. Both experiments contained a range of N:P fertilizer supply concentrations and the first experiment contained a two-level drought treatment while the second experiment contained a two-level mycorrhizal inoculation treatment. </p><p> In the first experiment, I found support for the hypothesis that <i> H</i> is higher in native than invasive plants, that environmental conditions (i.e. water availability) affect the value of <i>H</i>, and that differences in <i>H</i> were associated with differences in growth. In the second experiment, there was no successful mycorrhizal inoculation, resulting in no differences in <i>H</i> between mycorrhizal treatment groups. There were significant differences in total growth between the second experiment native and invasive grasses, despite there being no significant differences in <i>H</i>. Differences in <i>H</i> values between control-treated grasses in the two experiments may be due to differences in greenhouse temperature and light conditions. These results show first, significant differences exist in <i>H</i> between invasive and native grasses, with invasive grasses expressing lower values of <i> H</i>, second, environmental conditions effect the expression of <i> H</i>, and third, that differences in the expression of <i>H</i> are matched by differences in growth.</p><p>
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De, Moura Vicente Luís. "Two sisters, two cases of C.G. Jung : the story of two patients and their relation to Jung's evolving practice." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10040119/.
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This research conducts an investigation of Maggy Reichstein and Mischa Epper, two unknown cases of C.G. Jung, around the 1920s. The sisters belonged to an aristocratic family and Reichstein, born in Indonesia in 1894, brought her sister Epper, born in Holland in 1901, to Zürich to be treated in 1917. Epper’s story sheds light on an important period of the development in Jung’s practice. Her story adds information to the manner in which Jung applied and taught the techniques he developed in his self-experiment. Epper’s case also sheds light on the work of Maria Moltzer, one of Jung’s early close collaborators. Jung mentioned, anonymously, Reichstein's case as an example in different passages in his presentations and writings, relating it to the process of transference and countertransference, to the concept of synchronicity, and to his studies on Eastern psychology. He published some of her mandalas, and considered her able to understand his ideas in depth. Reichstein’s case challenged and triggered his interests in different subjects. The material presented can be compared to Jung’s treatments of Kristine Mann, Tina Keller-Jenny and Christiana Morgan, which took place in a similar period of time. The research also provides insights into how Jung shaped case material as examples for his concepts.
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Gudmundsson, Reynir Levi. "A numerical study of two-fluid models for dispersed two-phase flow." Doctoral thesis, KTH, Numerisk Analys och Datalogi, NADA, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132.
Full textAbstract:
In this thesis the two-fluid (Eulerian/Eulerian) formulation for dispersed two-phase flow is considered. Closure laws are needed for this type of models. We investigate both empirically based relations, which we refer to as a nongranular model, and relations obtained from kinetic theory of dense gases, which we refer to as a granular model. For the granular model, a granular temperature is introduced, similar to thermodynamic temperature. It is often assumed that the granular energy is in a steady state, such that an algebraic granular model is obtained. The inviscid non-granular model in one space dimension is known to be conditionally well-posed. On the other hand, the viscous formulation is locally in time well-posed for smooth initial data, but with a medium to high wave number instability. Linearizing the algebraic granular model around constant data gives similar results. In this study we consider a couple of issues. First, we study the long time behavior of the viscous model in one space dimension, where we rely on numerical experiments, both for the non-granular and the algebraic granular model. We try to regularize the problem by adding second order artificial dissipation to the problem. The simulations suggest that it is not possible to obtain point-wise convergence using this regularization. Introducing a new measure, a concept of 1-D bubbles, gives hope for other convergence than point-wise. Secondly, we analyse the non-granular formulation in two space dimensions. Similar results concerning well-posedness and instability is obtained as for the non-granular formulation in one space dimension. Investigation of the time scales of the formulation in two space dimension suggests a sever restriction on the time step, such that explicit schemes are impractical. Finally, our simulation in one space dimension show that peaks or spikes form in finite time and that the solution is highly oscillatory. We introduce a model problem to study the formation and smoothness of these peaks.<br>QC 20101018
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Guðmundsson, Reynir Leví. "A numerical study of two-fluid models for dispersed two-phase flow." Doctoral thesis, KTH, Numerical Analysis and Computer Science, NADA, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132.
Full textAbstract:
<p>In this thesis the two-fluid (Eulerian/Eulerian) formulation for dispersed two-phase flow is considered. Closure laws are needed for this type of models. We investigate both empirically based relations, which we refer to as a nongranular model, and relations obtained from kinetic theory of dense gases, which we refer to as a granular model. For the granular model, a granular temperature is introduced, similar to thermodynamic temperature. It is often assumed that the granular energy is in a steady state, such that an algebraic granular model is obtained. </p><p>The inviscid non-granular model in one space dimension is known to be conditionally well-posed. On the other hand, the viscous formulation is locally in time well-posed for smooth initial data, but with a medium to high wave number instability. Linearizing the algebraic granular model around constant data gives similar results. In this study we consider a couple of issues. </p><p>First, we study the long time behavior of the viscous model in one space dimension, where we rely on numerical experiments, both for the non-granular and the algebraic granular model. We try to regularize the problem by adding second order artificial dissipation to the problem. The simulations suggest that it is not possible to obtain point-wise convergence using this regularization. Introducing a new measure, a concept of 1-D bubbles, gives hope for other convergence than point-wise. </p><p>Secondly, we analyse the non-granular formulation in two space dimensions. Similar results concerning well-posedness and instability is obtained as for the non-granular formulation in one space dimension. Investigation of the time scales of the formulation in two space dimension suggests a sever restriction on the time step, such that explicit schemes are impractical. </p><p>Finally, our simulation in one space dimension show that peaks or spikes form in finite time and that the solution is highly oscillatory. We introduce a model problem to study the formation and smoothness of these peaks.</p>
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Michalchuk, Gloria Joan. "High school students' perceptions of reading two languages with two different orthographies." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60399.pdf.
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Lorenz, Sabrina [Verfasser]. "Non-invasive brain stimulation: comparing two methods in two systems / Sabrina Lorenz." Ulm : Universität Ulm, 2017. http://d-nb.info/1131710525/34.
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Jurgens, Eric. "The Silence: Overture and Two Scenes from an Opera in Two Acts." UKnowledge, 2013. http://uknowledge.uky.edu/music_etds/21.
Full textAbstract:
The Silence is the story of William Rose, a man who, while searching the world for his missing wife and daughter, is kidnapped and held in a secret Iranian prison. After many years of torture, abuse and a slow descent into insanity, secrets about his family manifest as mysterious and magical occurrences, creating a dangerous tension between the prisoners and guards. Questions begin to arise: Who is actually in charge of this prison? Why haven’t the guards ever met the warden? Why is the prison haunted by mysterious voices? And what exactly would it take to crumble the walls of this corrupt institution?
Act II scene iii, The Hour of Angels – William sits alone in his cell, carving the images of his wife and daughter into the wall. As he begs his family to come back to him, the image of his wife slowly comes to life.
Intermezzo and Act II scene i, Danger in the Meadow – Flashback. The prison guards spy on Christina and Madelyn Rose as they play in a meadow not far from the secret prison. Christina sees them hiding and in a panic sends her daughter to a distant building to hide and look for help.
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Campbell, Fiona. "Imitative and nonimitative social learning using a two object/two action procedure." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327045.
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Mosley, David W. "Two-dimensional polymer synthesis : towards a two-dimensional replicating system for nanostructures." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33652.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2005.<br>Vita.<br>Includes bibliographical references<br>The general concept of a replicating monolayer system is introduced as a new method of nanostructure synthesis. One possible implementation of a 2-D replicating system is pursued which uses a diacetylene moiety for cross-linking and amide hydrogen bonding for molecular recognition between replicates and templates. The synthesis of several monomers for amide hydrogen-bonded adlayer formation is described. The assembly and crosslinking of diacetylene monomers on an underlying amide-capped self- assembled monolayer (SAM) was studied on unpatterned thermally evaporated gold films. Raman and Fourier-transform infrared spectroscopies, as well as ellipsometry and contact angle data, indicate that amide hydrogen bonding interactions are sufficient to organize an adlayer of diacetylene-containing molecules on the underlying SAM which can be polymerized with ultraviolet light. In order to obtain gold substrates suitable for cross-linking of bis(diacetylene) monomers, new methods of producing ultraflat gold surfaces were developed.<br>(cont.) A solid- state bonding technique using only gold was developed, yielding ultraflat gold surfaces, with root-mean-square roughnesses of -0.5 nm, on glass slides which are free of impurities from epoxies or other bonding agents. The patterning and cross-linking of poly(diacetylene) adlayers on ultraflat gold surfaces was investigated by atomic force microscopy (AFM). Soft lithography was suitable for adlayer structures down to about 500 nm. Electron beam lithography for patterning of polymerizable adlayers was demonstrated for the first time. The polymerized adlayer patterns were significantly more difficult to remove from the gold surface than unpolymerized adlayer patterns, indicating cross-linking. Studies to remove adlayer patterns as intact 2-D polymers failed, due either to poor cross-linking or robustness of the resulting 2-D polymers. In another approach to nanostructure synthesis, the synthesis of monofunctionalized gold nanoparticles by a solid phase synthetic route was described. This represents a versatile method of producing monofunctionalized nanoparticles, which can be used to produce and study more elaborate nanoparticle structures.<br>by David W. Mosley.<br>Ph.D.
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Walker, Gregory James. "Numerical studies of two phase flow and melt extraction in two dimensions." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624305.
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Junior, Josà Mairton Barros da Silva. "Radio resource management for single-and two-hop device-two-device communications." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13524.
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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>Ericsson Brasil<br>O aumento da demanda por serviÃos ricos em multimÃdia e a escassez do espectro eletromagnÃtico tÃm motivado a pesquisa de tecnologias capazes de aumentar a capacidade
de sistemas sem fio sem requerer espectro adicional.
Nesse contexto, comunicaÃÃes Dispositivo-a-Dispositivo (D2D, do inglÃs Device-to-Device) representam uma tecnologia promissora. Ao permitir comunicaÃÃo direta e de baixa potÃncia entre os dispositivos, comunicaÃÃes D2D levam a um maior e mais inteligente reuso dos recursos de rÃdio, permitindo um descongestionamento da rede de transporte de dados. Como resultado, a capacidade total do sistema e especialmente a eficiÃncia espectral sÃo aumentadas; e a proximidade entre os dispositivos permitem transferÃncias de dados com baixo atraso e altas taxas de dados, sem requerer potÃncia extra da bateria dos dispositivos.
Entretanto, com o objetivo de tornar real os potenciais ganhos de comunicaÃÃes D2D como uma rede secundÃria da celular (primÃria), algumas questÃes chave precisam ser controladas. Assumindo que os dispositivos se comunicando estÃo cientes um do outro, a condiÃÃo do enlace (canal) deve ser avaliada. Caso seja benÃfica, tÃcnicas de GestÃo de recursos de rÃdio (RRM, do inglÃs Radio Resource Management) sÃo empregadas para que a interferÃncia co-canal causada nos dispositivos celulares seja mitigada. Tais tÃcnicas podem ser resumidas como: agrupamento, seleÃÃo de modo e controle de potÃncia.
Nessa dissertaÃÃo, eu foco a minha atenÃÃo para RRM em comunicaÃÃes D2D subjacentes a redes LTE, e para as principais tÃcnicas de RRM para mitigar a interferÃncia co-canal. Objetivando a reduÃÃo da interferÃncia intra-celular e na melhoria da eficiÃncia espectral, eu formulo um problema conjunto de agrupamento e controle de potÃncia. Entretanto,
devido à sua complexidade eu proponho mÃtodos sub-Ãtimos para agrupar usuÃrios celulares e D2D com o objetivo de minimizar a interferÃncia intra-celular, levando em conta a
ortogonalidade espacial entre os usuÃrios que compartilham o recurso. AlÃm disso, eu analiso mÃtodos para decidir se um candidato D2D deveria se comunicar diretamente ou de modo
convencional atravÃs da estaÃÃo rÃdio-base (eNB, do inglÃs Evolved Node B). Os resultados mostram que comunicaÃÃes D2D conseguem melhorar a eficiÃncia espectral do sistema e
que a maioria dos ganhos pode ser alcanÃada agrupando de forma adequada os usuÃrios para compartilhar recursos baseando-se em projeÃÃes sucessivas e ortogonais, assim como combinando diferentes mÃtricas de compatibilidade espacial.
AlÃm disso, nessa dissertaÃÃo eu argumento que tecnologias D2D podem ser usadas para aumentar ainda mais a eficiÃncia espectral e energÃtica se os parÃmetros chave dos algoritmos
de RRM forem adequadamente estendidos para comunicaÃÃes D2D em mÃltiplos saltos. Especificamente, eu proponho um novo algoritmo distribuÃdo de controle de potÃncia baseado
em maximizaÃÃo da utilidade que à capaz de equilibrar eficiÃncia espectral e energÃtica, enquanto leva em consideraÃÃo a seleÃÃo de modo e restriÃÃes na alocaÃÃo de recursos inerentes à integraÃÃo do ambiente celular-D2D. Os resultados numÃricos mostram que comunicaÃÃes D2D em mÃltiplos saltos combinadas com o algoritmo de controle de potÃncia proposto sÃo Ãteis nÃo apenas para colher os potenciais ganhos identificados na literatura, mas tambÃm para estender a cobertura de redes celulares.<br>The increasing demand for fast multimedia services and the scarcity of electromagnetic spectrum has motivated the research of technologies able to increase the capacity of wireless systems without requiring additional spectrum.
In this context, Device-to-Device (D2D) communication represents a promising technology. By enabling direct and low-power communication among devices, D2D communication leads to an increased and intelligent spatial reuse of radio resources allowing to offload the data transport network. As a result, the overall system capacity and specially the spectral efficiency is increased; and the proximity between devices allows data transfer with low delays and high rates without requiring extra
power from devicesâ batteries.
However, in order to realize the potential gains of D2D communications as a secondary network of the cellular (primary) one, some key issues must be tackled. Assuming that the communicating devices are aware of each other, the actual link (channel) conditions must be evaluated. If beneficial, Radio Resource Management (RRM) techniques would be employed so that the co-channel interference caused in cellular devices would be mitigated. Such
techniques may be summarized as: grouping, mode selection, and power control.
In this thesis, I focus my attention on the RRM for D2D communications underlaying a Long Term Evolution (LTE)-like network, and the main RRM techniques to mitigate the co-channel interference. Aiming at the reduction of the intra-cell interference and at the improvement of spectral efficiency, I formulate a joint grouping and power allocation problem. However, due to its complexity I propose suboptimal methods to group cellular and D2D User
Equipments (UEs) with the goal of minimizing intra-cell interference, taking into account spatial orthogonality between the UEs that share the same resources. In addition, I analyze methods to decide if D2D-capable UEs should communicate directly to one another or in the conventional way via the Evolved Node B (eNB). The results show that D2D communications can improve the spectral efficiency of the system and that most of this improvement can be achieved by suitably grouping the UEs for sharing resources based on successive orthogonal projections and matching different spatial compatibility metrics.
Moreover, in this thesis I argue that D2D technology can be used to further increase the spectral and energy efficiency if the key D2D RRM algorithms are suitably extended to support network assisted multi-hop D2D communications. Specifically I propose a novel, distributed utility maximizing power control (PC) scheme that is able to balance spectral and energy efficiency while taking into account mode selection and resource allocation constraints that are important in the integrated cellular-D2D environment. The analysis and numerical results indicate that multi-hop D2D communications combined with the proposed PC scheme can be useful not only for harvesting the potential gains previously identified in the literature, but also for extending the coverage of cellular networks.
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MacGabhann, Donncha. "The making of the Book of Kells : two Masters and two Campaigns." Thesis, School of Advanced Study, University of London, 2016. http://sas-space.sas.ac.uk/6920/.
Full textAbstract:
This thesis investigates the number of individuals involved in the making of the Book of Kells. It demonstrates that only two individuals, identified as the Scribe-Artist and the Master-Artist, were involved in its creation. It also demonstrates that the script is the work of a single individual - the Scribe-Artist. More specific questions are answered regarding the working relationships between the book’s creators and the sequence of production. This thesis also demonstrates that the manuscript was created over two separate campaigns of work. The comprehensive nature of this study focuses on all aspects of the manuscript including, script, initials, display-lettering, decoration and illumination.
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Silva, Junior José Mairton Barros da. "Radio resource management for single and two-hop device-two-device communications." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/11072.
Full textAbstract:
SILVA JUNIOR, J. M. B. Radio resource management for single and two-hop device-two-device communications. 2014. 77 f. Dissertação (Mestrado em Engenharia de Teleinformática) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2014.<br>Submitted by Marlene Sousa (mmarlene@ufc.br) on 2015-03-24T14:24:35Z
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Previous issue date: 2014-10-30<br>The increasing demand for fast multimedia services and the scarcity of electromagnetic spectrum has motivated the research of technologies able to increase the capacity of wireless systems without requiring additional spectrum. In this context, Device-to-Device (D2D) communication represents a promising technology. By enabling direct and low-power communication among devices, D2D communication leads to an increased and intelligent spatial reuse of radio resources allowing to offload the data transport network. As a result, the overall system capacity and specially the spectral efficiency is increased; and the proximity between devices allows data transfer with low delays and high rates without requiring extra power from devices’ batteries. However, in order to realize the potential gains of D2D communications as a secondary network of the cellular (primary) one, some key issues must be tackled. Assuming that the communicating devices are aware of each other, the actual link (channel) conditions must be evaluated. If beneficial, Radio Resource Management (RRM) techniques would be employed so that the co-channel interference caused in cellular devices would be mitigated. Such techniques may be summarized as: grouping, mode selection, and power control. In this thesis, I focus my attention on the RRM for D2D communications underlaying a Long Term Evolution (LTE)-like network, and the main RRM techniques to mitigate the co-channel interference. Aiming at the reduction of the intra-cell interference and at the improvement of spectral efficiency, I formulate a joint grouping and power allocation problem. However, due to its complexity I propose suboptimal methods to group cellular and D2D User Equipments (UEs) with the goal of minimizing intra-cell interference, taking into account spatial orthogonality between the UEs that share the same resources. In addition, I analyze methods to decide if D2D-capable UEs should communicate directly to one another or in the conventional way via the Evolved Node B (eNB). The results show that D2D communications can improve the spectral efficiency of the system and that most of this improvement can be achieved by suitably grouping the UEs for sharing resources based on successive orthogonal projections and matching different spatial compatibility metrics. Moreover, in this thesis I argue that D2D technology can be used to further increase the spectral and energy efficiency if the key D2D RRM algorithms are suitably extended to support network assisted multi-hop D2D communications. Specifically I propose a novel, distributed utility maximizing power control (PC) scheme that is able to balance spectral and energy efficiency while taking into account mode selection and resource allocation constraints that are important in the integrated cellular-D2D environment. The analysis and numerical results indicate that multi-hop D2D communications combined with the proposed PC scheme can be useful not only for harvesting the potential gains previously identified in the literature, but also for extending the coverage of cellular networks<br>O aumento da demanda por serviços ricos em multimídia e a escassez do espectro eletromagnético têm motivado a pesquisa de tecnologias capazes de aumentar a capacidade de sistemas sem fio sem requerer espectro adicional. Nesse contexto, comunicações Dispositivo-a-Dispositivo (D2D, do inglês Device-to-Device) representam uma tecnologia promissora. Ao permitir comunicação direta e de baixa potência entre os dispositivos, comunicações D2D levam a um maior e mais inteligente reuso dos recursos de rádio, permitindo um descongestionamento da rede de transporte de dados. Como resultado, a capacidade total do sistema e especialmente a eficiência espectral são aumentadas; e a proximidade entre os dispositivos permitem transferências de dados com baixo atraso e altas taxas de dados, sem requerer potência extra da bateria dos dispositivos. Entretanto, com o objetivo de tornar real os potenciais ganhos de comunicações D2D como uma rede secundária da celular (primária), algumas questões chave precisam ser controladas. Assumindo que os dispositivos se comunicando estão cientes um do outro, a condição do enlace (canal) deve ser avaliada. Caso seja benéfica, técnicas de Gestão de recursos de rádio (RRM, do inglês Radio Resource Management) são empregadas para que a interferência co-canal causada nos dispositivos celulares seja mitigada. Tais técnicas podem ser resumidas como: agrupamento, seleção de modo e controle de potência. Nessa dissertação, eu foco a minha atenção para RRM em comunicações D2D subjacentes a redes LTE, e para as principais técnicas de RRM para mitigar a interferência co-canal. Objetivando a redução da interferência intra-celular e na melhoria da eficiência espectral, eu formulo um problema conjunto de agrupamento e controle de potência. Entretanto, devido à sua complexidade eu proponho métodos sub-ótimos para agrupar usuários celulares e D2D com o objetivo de minimizar a interferência intra-celular, levando em conta a ortogonalidade espacial entre os usuários que compartilham o recurso. Além disso, eu analiso métodos para decidir se um candidato D2D deveria se comunicar diretamente ou de modo convencional através da estação rádio-base (eNB, do inglês Evolved Node B). Os resultados mostram que comunicações D2D conseguem melhorar a eficiência espectral do sistema e que a maioria dos ganhos pode ser alcançada agrupando de forma adequada os usuários para compartilhar recursos baseando-se em projeções sucessivas e ortogonais, assim como combinando diferentes métricas de compatibilidade espacial. Além disso, nessa dissertação eu argumento que tecnologias D2D podem ser usadas para aumentar ainda mais a eficiência espectral e energética se os parâmetros chave dos algoritmos de RRM forem adequadamente estendidos para comunicações D2D em múltiplos saltos. Especificamente, eu proponho um novo algoritmo distribuído de controle de potência baseado em maximização da utilidade que é capaz de equilibrar eficiência espectral e energética, enquanto leva em consideração a seleção de modo e restrições na alocação de recursos inerentes à integração do ambiente celular-D2D. Os resultados numéricos mostram que comunicações D2D em múltiplos saltos combinadas com o algoritmo de controle de potência proposto são úteis não apenas para colher os potenciais ganhos identificados na literatura, mas também para estender a cobertura de redes celulares
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Lavoie, Philippe. "Three-dimensional object reconstruction using structured light and two two-dimensional images." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/10255.
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For machine vision and for graphical representation of real objects in a computer environment, the three-dimensional (3D) reconstruction of the image of a real object has become a key technique. A few methods such as range finding, which use laser scanners, computer tomography, based on CTR or MRI machines, computational stereo, etc. were developed. Computational stereo is broadly defined as the recovery of 3D characteristics of a scene from a series of images obtained from different points in the three dimensional (Euclidean) space. In this thesis, a new algorithm and system is introduced and developed for the 3D reconstruction of the images of real objects from two 2D images required with two cameras. The algorithm is based on a new matching method, a new procedure for the determination of the fundamental matrix used in stereo vision, and a new technique for stereo fusion. The novelty of the matching procedure, and of the determination of the camera alignment, consists of the projection of a structured light pattern on the real object, the pattern being created using a pseudo-random encoded mesh (PRBA) (34). The novelty of the stereo fusion algorithm consists of the application of the dynamic programming principle (DP) (5) (27) using a cost function which contains the information obtained from the list of matched points. It is also proposed to use an autoregressive (AR) modeling technique for calculating the stereo disparity of each pixel of the two images. The autoregressive filter helps the DP part of the algorithm to calculate the disparity of the pixels when the above pixels are occluded. The above proposed methods offer three distinctive advantages over a conventional stereo system: (1) It easily generates a list of matching points. (2) It adds structure to an object without textures. (3) It is less computational intensive.
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Kafeel, Khurram. "Modelling and simulation of two-phase closed thermosyphones using two-fluid method." Thesis, University of Manchester, 2014. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:239221.
Full textAbstract:
Computational Fluid Dynamics (CFD) has become one of the main instruments for the prediction of many commercial and research oriented fluid flow and heat transfer problems. While single phase flow analysis through CFD has gained grounds within the commercial industry, multiphase flow analysis is still the subject of further research and development. Heat Pipes and thermosyphones are no exception to this. However, the involvement of more than one fluid phase within these devices has made their analysis through CFD more challenging and computationally more demanding to perform. In this thesis, computational fluid dynamics is used as a modelling tool in order to predict the thermal hydraulic behaviour of multiphase environment within thermosyphones and heat pipes. Eulerian two-fluid method is used to solve the conservation equations for mass, momentum and energy, for each phase along with the inclusion of interfacial heat and mass transfer terms. Numerical predictions are obtained for the steady-state and transient operation of stationary thermosyphon, while rotating heat pipes operation is also simulated using axially and radially rotating heat pipe models. Apart from using the commercially available CFD code for the analysis of thermosyphones related simulation, numerical work is performed regarding the coupling of momentum equations based on Eulerian two-fluid modelling scheme. OPENFOAM open source code is used and modified to include the Partial Elimination Algorithm (PEA) for the coupling of interfacial exchange terms, including interfacial mass transfer term, in the momentum equations of both phases. Results obtained from above discussed studies provide good agreement with corresponding experimental and analytical observations.
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Sobescukaitè, Neringa. "Two regimes, two university cities." Master's thesis, 2013. http://hdl.handle.net/10316/24414.
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Wang, I.-Yi, and 王以愔. "Trigonometry of Two-by-Two Matrices." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/20476491819862176409.
Full textAbstract:
碩士<br>國立成功大學<br>數學系應用數學碩博士班<br>95<br>In this thesis, we study the trigonometry of linear operators on 2-dimensional Hilbert spaces. If A is a normal matrix, then we have |cos|^{2}A+|sin|^{2}A=1
and cos^{2}A+sin^{2}A=1. If A is a nonnormal matrix,
then we get some conclusions and we conjecture that
the equality |cos|^{2}A+|sin|^{2}A=1 is hold for every
two-by-two matrices.