We present new measures of the rotation curves of disc galaxies from z~0.2 to z~1.7, using deep exposures from both DEIMOS and LRIS spectrographs on the Keck telescopes in combination with multi-band imaging from the Hubble Space Telescope. We do this with a new modelling code, curvation, which has been optimised to extract the rotation velocity measurements from galaxies at intermediate and high redshift. To this end, we conduct a bulge-to-disc de-composition to allow us to de-project observed velocities to extract a model of the intrinsic rotation curve. We demonstrate the improved accuracy and precision of these measurements via a number of tests, but primarily in recovering an intrinsic scatter of the high redshift Tully-Fisher relation which is similar to that found locally. We show for the first time that the stellar mass Tully-Fisher relation is tightly in place at z~1, the normalisation of which has evolved less than 0.02±0.02 dex in stellar mass from z~1.7 to z~0.2. We do however see evidence for evolution in classic B-band Tully-Fisher relation, which is brighter at z~1 by 0.85±0.28 magnitudes than that at z~0.3. This trend is consistent with what was previously known about the evolving star-formation rates of disc galaxies. We then explore the potential drivers of these trends in the Tully-Fisher relation by estimating the baryonic and dark matter content of our galaxies. We also discover a surprising trend in the bulgeless disc galaxies at high redshift, which may be evolving differently from other rotationally supported galaxies. In the context of work which has been conducted at z~2, we discuss our results of a stellar mass Tully-Fisher relation which is strikingly similar over two-thirds of the age of the Universe.

The focus of this dissertation is to utilize chemical functionalization as a probe to investigate the reactivity of N-doped multiwalled carbon nanotubes (N-MWCNTs). The surface of N-MWCNTs, being a set of potentially reactive graphene edges, provides a large number of reactive sites for chemical modification, so considerable changes in chemical and physical properties can be envisaged. We observed that both reduction (dissolving metal reduction/alkylation) and oxidation (H2SO4/HNO3 and H2SO4/KMnO4 mixtures) of N-MWCNTs lead to formation of interesting spiral channels and spiraled carbon nanoribbons. A variety of techniques, including TGA, SEM, TEM, XRD and surface area measurements were used to analyze these new textural changes. We have developed methods to demonstrate that specific chemistry has occurred on these new structures. To this end, we introduced metal-binding ligands that could be used as probes in imaging and spectroscopic techniques including TEM, STEM, EDX, and EELS. A proposal for the underlying structure of N-MWCNTs responsible for the formation of the new textures is presented. We have investigated the performance of our materials as potential negative electrodes for rechargeable lithium ion batteries.

Star formation in the Milky Way is confined to star-forming regions (OB association, HII regions, and open clusters) in the Galactic plane. It is usually assumed that these regions are found preferably along spiral arms, as is observed in other spiral galaxies. However, young early-type stars are often found at high Galactic latitudes, far away from their birthplaces in the Galactic disc. These stars are called runaway stars, and it is believed that they were ejected from their birth- places early in their lifetimes by one of two mechanisms: ejection from a binary system following the destruction of the massive companion in a supernova type II event (the binary ejection mechanism), or ejection from a dense cluster following a close gravitational encounter between two close binaries (the dynamical ejection mechanism). The aims of our study were: to improve the current understanding of the nature of high Galactic latitude runaway stars, in particular by investigating whether the theoretical ejection mechanisms could explain the more extreme cases; to show the feasibility of using high Galactic latitude stars as tracers of the spiral arms. The main technique used in this investigation was the tracing of stellar orbits back in time, given their present positions and velocities in 3D space. This technique allowed the determination of the ejection velocities, flight times and birthplaces of a sample of runaway stars. In order to obtain reasonable velocity estimates several recent catalogues of proper motion data were used. We found that the evolutionary ages of the vast majority of runaway stars is consistent with the disc ejection scenario. However, we identified three outliers which would need flight times much larger then their estimated ages in order to reach their present positions in the sky. Moreover, the ejection velocity distribution appears to be bimodal, showing evidence for two populations of runaway stars: a “low” velocity population (89 per cent of the sample), with a maximum ejection velocity of about 300 kms−1, and a “high” velocity population, with ejection velo- cities of 400 – 500 kms−1. We argue that the observed bimodality and maximum ejection velocity of 500 kms−1 can be interpreted as a natural consequence of a variation of the binary ejection mechanism. A possible connection between the “high” velocity population and the so-called hypervelocity stars is also explored, resulting in the conclusion that some stars previously identified as hypervelocity may be in fact runaway stars. The feasibility of using stars as tracers of the spiral arms was tested on a local sample, in order to obtain better quality data and larger numbers. We found that the spiral arms pattern speeds estimated from this sample (24.9±5.2 kms−1 kpc−1) and from a selected sample of runaways (22.8 ± 7.8 kms−1 kpc−1) are consistent within the errors and also consistent with other published estimates. We concluded that our estimates combined with the ones obtained in other studies suggest a value in the range 20 − 25 kms−1 kpc−1 for the pattern speed. Moreover, we concluded that an adequate representation of the spiral arms is obtained given the former pattern speed estimate, even when applied to the sample of runaway stars.

Ce mémoire de maîtrise a été accompli simultanément à des études à temps plein en droit. / Le Québec est confronté à un vieillissement de sa population et une pénurie de main-d’œuvre spécialisée. Pour faire face à ces difficultés tout en restant compétitives à l’échelle internationale, les entreprises québécoises doivent adopter des méthodes de gestion novatrices qui génèrent une performance élevée chez leurs travailleurs peu nombreux. Il est donc essentiel de se servir – et de repenser – le mieux possible des déterminants reconnus de la performance au travail, au premier chef : la motivation. Or, les recherches adoptent habituellement une perspective linéaire en un temps entre ces variables, alors que différentes études soulèvent la possibilité que les relations soient différentes lorsque ces variables sont analysées dans une perspective autre que linéaire. La présente étude teste si une dynamique cyclique se produit. Les résultats de médiation multiples ne révèlent pas d’effet significatif de la motivation entre les performances de deux temps de mesure consécutifs. Cela conforte la nécessité d’élargir la recherche sur de nouvelles variables de manière à vérifier le potentiel lien cyclique entre deux performances. Également, cette recherche relève une zone d’ombre dans la relation dynamique entre la motivation et la performance : ce lien n’est pas aussi lisse qu’il ne le semble. Il arrive parfois que les motivations et performances initiales aient un impact plus déterminant sur les comportements futurs. / Québec has to deal with an aging population and a shortage of highly-skilled labor. In order to face these difficulties while remaining competitive internationally, Quebec’s businesses must adopt new management methods that generate a higher performance from their fewer workers. It is therefore essential to better utilize – and rethink – the predictors of work performance with motivation at the forefront of this endeavor. However, studies usually adopt a one-time only linear perspective between these variables, while other studies suggest that the relations between them would differ when analyzed more dynamically. The present study tests if a cyclic relation performance-motivation- performance occurs. Multiple mediation results do not show a significant effect of various forms of motivation on the performance of two consecutive time measures; hence supporting the need for future studies to test new variables in order to verify the potential cyclical link between two performances. Moreover, the present study identifies a grey zone in the dynamic relation between motivation and performance. Indeed, the link isn’t as smooth as it seems since initial motivations and performances appear to have the greatest impact on future behaviors.

A fibrilação, atrial ou ventricular, é caracterizada por uma desorganização da atividade elétrica do músculo. O coração, que normalmente contrai-se globalmente, em uníssono e uniforme, durante a fibrilação contrai-se localmente em várias regiões, de modo descoordenado. Para estudar qualitativamente este fenômeno, é aqui proposto um novo modelo matemático, mais simples do que os demais existentes e que, principalmente, admite uma representação singela na forma de circuito elétrico equivalente. O modelo foi desenvolvido empiricamente, após estudo crítico dos modelos conhecidos, e após uma série de sucessivas tentativas, ajustes e correções. O modelo mostra-se eficaz na simulação dos fenômenos, que se traduzem em padrões espaciais e temporais das ondas de excitação normais e patológicas, propagando-se em uma grade de pontos que representa o tecido muscular. O trabalho aqui desenvolvido é a parte básica e essencial de um projeto em andamento no Departamento de Engenharia Elétrica da EESC-USP, que é a elaboração de uma rede elétrica ativa, tal que possa ser estudada utilizando recursos computacionais de simuladores usualmente aplicados em projetos de circuitos integrados / Atrial and ventricular fibrillation are characterized by a disorganized electrical activity of the cardiac muscle. While normal heart contracts uniformly as a whole, during fibrillation several small regions of the muscle contracts locally and uncoordinatedly. The present work introduces a new mathematical model for the qualitative study of fibrillation. The proposed model is simpler than other known models and, more importantly, it leads to a very simple electrical equivalent circuit of the excitable cell membrane. The final form of the model equations was established after a long process of trial runs and modifications. Simulation results using the new model are in accordance with those obtained using other (more complex) models found in the related literature. As usual, simulations are performed on a two-dimensional grid of points (representing a piece of heart tissue) where normal or pathological spatial and temporal wave patterns are produced. As a future work, the proposed model will be used as the building block of a large active electrical network representing the muscle tissue, in an integrated circuit simulator

Introdução: A hipoxemia é uma complicação frequente no pós-operatório de cirurgia de revascularização miocárdica (RM) com circulação extracorpórea (CEC), normalmente decorrente da formação de atelectasia pulmonar. O presente estudo visa investigar o papel do coração na perda de aeração dos lobos pulmonares inferiores. Métodos: Dezessete pacientes sem disfunção cardíaca foram submetidos a tomografia computadorizada (TC) pré e pósoperatória em apnéia após expiração normal. A massa cardíaca, a pressão exercida pelas protrusões cardíacas direita e esquerda sobre os segmentos pulmonares subjacentes a elas e a fração de tecido pulmonar atelectasiado dos mesmos segmentos e dos segmentos não subjacentes foram avaliados nos cortes tomográficos 1 cm acima do diafragma. Resultados: A massa cardíaca sofreu um aumento de 32% (117 ± 31g vs. 155 ± 35g; p < 0,001) no pós-operatório, levando a um aumento nas pressões exercidas pelas protrusões cardíacas direita (2,2 ± 0,6 g.cm-2 vs 3,2 ± 1,2 g.cm-2; p < 0,05) e esquerda (2,4 ± 0,7 g.cm-2 vs. 4,2 ± 1,8 g.cm-2; p < 0,001) sobre os segmentos pulmonares subjacentes. A fração média de tecido atelectasiado direita e esquerda abaixo das protrusões aumentou substancialmente no pós-operatório (6,7% para 32,9% e 6,2% para 29%, respectivamente; p < 0,001). Este aumento foi menos pronunciado nas áreas não subjacentes (direito: 0,7% para 10,8%, esquerdo 1,5% para 12,6%; p < 0,001). Conclusão: A pressão exercida pelo coração sobre os pulmões aumentou no período pós-operatório, contribuindo de forma importante para a formação de atelectasias nos segmentos pulmonares subjacentes / Introduction: Atelectasis is a major cause of hypoxemia after onpump coronary artery bypass grafting (CABG). General anesthesia, use of high inspiratory oxygen concentration and cardiopulmonary bypass (CPB) are implicated in the genesis of atelectasis. However, the contribution of pressure exerted by the heart to collapse the underlying lung is unknown. The objective of this study was to evaluate the role of heart-induced pulmonary compression after on-pump CABG. Methods: Seventeen patients without cardiac dysfunction underwent pre and postoperative thoracic computed tomography (CT) in apnea conditions after a normal expiration. The cardiac mass, the pressure exerted on the lungs by the right and left heart segments and the collapsed lung fraction of lower lobe segments below and outside of the heart limits were evaluated in a CT section 1 cm above the diaphragm. Results: Cardiac mass increased by 32% (117 ± 31g vs. 155 ± 35g; p <0.001) postoperatively, leading to an increase in the pressures exerted by right (2.2 ± 0.6 g.cm-2 vs. 3.2 ± 1.2 g.cm-2; p <0.05) and left heart segments (2.4 ± 0.7 g.cm-2 vs. 4.2 ± 1.8 g.cm-2; p <0.001) on the lungs. The median fraction of collapsed right (6.7% to 32.9%; p <0.001) and left (6.2% to 29%; p <0.001) lung parenchyma segments beneath the heart greatly increased postoperatively, while it was less important outside of the heart limits, (right: 0.7% to 10.8; p<0,001 and left: 1.5% to 12.6%; p<0,001). Conclusion: The pressure exerted by the heart on the lungs increased postoperatively, importantly contributing to collapse the subjacent pulmonary segments

O presente trabalho é um estudo comparativo entre a modelagem de motores de indução bifásicos simétricos com o uso da transformação dq0, que é uma modelagem matemática clássica na análise dos motores de indução bifásicos e a modelagem através da teoria do vetor espiral, proposta na década de 80 para os motores de indução trifásicos. A modelagem clássica é apresentada detalhadamente, bem como a modelagem por vetores espirais. Foram realizadas simulações para comparar os resultados entre as diferentes abordagens. / This work is a comparative study between the classic modeling using dq0 transformation and the spiral vector theory applied to study symmetrical two-phase induction machine. The spiral vector theory was proposed by Dr. Sakae Yamamura to study electrical machines in the middle of 1980s. To compare both types of modeling, simulations were performed to solve differential equations.

As galáxias espirais continuam desafiando as teorias que buscam explicar como o universo se tornou o que observamos hoje. Em especial, no contexto hierárquico de formação de estruturas, é difícil entender como as galáxias podem ser tão parecidas entre si, obedecendo a relações de escala tão estritas, apesar de suas diferentes histórias evolutivas. A fim de esclarecer algumas dessas perguntas, o projeto GHASP observou 203 galáxias na linha H-alfa, através de interferometria Fabry-Perot, construindo uma base de dados homogênea e de alta qualidade para estudos cinemáticos do universo local. Neste trabalho, buscamos complementar os resultados consolidados do GHASP, apresentando um estudo fotométrico para 173 destas galáxias na banda Rc. Os dados, provenientes de observações no telescópio de 1,2m do Observatório de Haute-Provence ou do projeto SDSS, foram cuidadosamente tratados com ferramentas de redução IRAF adaptados para a automação dos processos. Através do ajuste de elipses sobre as galáxias, foram obtidos perfis de brilho calibrados e magnitudes totais para as galáxias da amostra. A decomposição da luz destes perfis foi estudada através de um modelo exponencial para o disco e uma função de Sérsic para o bojo. Os resultados da decomposição bojo-disco foram utilizados para o estudo de relações de escala e correlações entre os diversos parâmetros medidos. Algumas das mais significativas correlações são detalhadas, como a relação entre os parâmetros de escala de bojo e disco, que reforçam o cenário de evolução secular das galáxias disco. Finalmente, com o auxílio dos resultados cinemáticos da literatura, apresentamos, pela primeira vez, a relação Tully-Fisher para a amostra do GHASP, na banda Rc. / The spiral galaxies still challenge the theories that try to explain how the universe has turned into what we see today. In particular, in the context of the hierarchical structure formation, it is difficult to understand how galaxies can be so similar, obeying such strict scaling relations, in spite of their distinct evolutionary histories. In order to clarify some of these questions, the GHASP project has observed 203 galaxies in the H-alpha line, through Fabry-Perot interferometry, and has built a homogeneous and high quality database for kinematical studies in the local universe. In the present work, we seek to supplement the GHASP project results, presenting a photometric study for 173 of those galaxies in the Rc band. The data, taken with the 1.2m telescope at Haute-Provence Observatory or extracted from the SDSS database, was carefully treated with customized IRAF routines for the automation of most of the jobs. By fitting ellipses over the galaxies, calibrated surface brightness profiles and total magnitudes were obtained for galaxies in the sample. Then, galaxy light decomposition techniques were employed using an exponential model for the disk and a Sérsic function for the bulge. The results of the bulge-disk decomposition were used for the study of scaling relations and correlations among the several measured parameters. A few of the most significant correlations were described, such as the relation between bulge and disc scale lengths, reinforcing the galaxy-disk secular evolutionary scenario. Finally, with the aid of kinematic results from the literature, we present, for the first time, the Tully-Fisher relation for the GHASP sample, in the Rc-band.

Submitted by admin tede (tede@pucgoias.edu.br) on 2017-04-27T12:29:11Z No. of bitstreams: 1 RAFAEL SOUZA BONIFÁCIO.pdf: 1138929 bytes, checksum: 39a4b1bda2dfd94d3eea7bbd3c234fc3 (MD5) / Made available in DSpace on 2017-04-27T12:29:11Z (GMT). No. of bitstreams: 1 RAFAEL SOUZA BONIFÁCIO.pdf: 1138929 bytes, checksum: 39a4b1bda2dfd94d3eea7bbd3c234fc3 (MD5) Previous issue date: 2017-03-22 / The object of this dissertation is the writing in Avalovara (2005), of Osman Lins. The characteristics of the work reflect the new way of making art, becoming a kind of enigma. The general objective is to draw perceptions of the construction of the work. The specific objectives are developed around uniform and unequifled readings of the palindromes, perceiving the effects of the narrative that circulate times in the textual artistic atemporality. Criticism of the literary text in Avalovara (2005) propounds supposed divergences from the recognition of the work as a single genre, for it mixes words and symbols in the same field. The supposed need to show something different makes this literary art a reflection of solitary life in society. The stories depart from the imaginary, being revealed in the signs, in the spaces of plural senses, such as Abel's love . The sign form is contained within the palindrome within the spiral. Its coverage is of elements made up of words, numbers, symbols. All used to highlight the signs of a glowing image of literary genre. The authors worked include Ana Luiza Andrade (2014); Hannah Arendt (2000); Gaston Bachelard (2000); Mikhail Bakhtin (1997); João Alexandre Barbosa (1974); Roland Barthes (1992; 1987); Walter Benjamin (1996); Henri Bergson (2006); Antonio Candido (2005); Gilles Deleuze (1999; 2005); Benedito Nunes (1995), among others. In this sense, the theoretical analysis of writing focuses on the configuration of discourse. Thus, the structures of composition of the narrative permeate the Greek theater, with the palindrome, characteristic of the third century BC. Completeness goes on towards the infinite, establishing the imaginary by the fragments, causing variation of focuses, spaces, temporalities and languages. / O objeto desta dissertação é a escritura em Avalovara (2005), de Osman Lins. As características da obra repercutem a maneira nova de fazer arte, configurando-se numa espécie de enigma. O objetivo geral é traçar percepções da construção da obra. Os objetivos específicos são desenvolvidos em torno de leituras uniformes e desuniformes dos palíndromos, percebendo os efeitos da narrativa que circulam tempos na atemporalidade artística textual. A crítica do texto literário em Avalovara (2005) propala supostas divergências do reconhecimento da obra como gênero único, pois mistura palavras e símbolos num mesmo campo. A suposta necessidade de transparecer algo diferente faz dessa arte literária reflexo da vida solitária em sociedade. As histórias partem do imaginário, sendo reveladas nos signos, nos espaços de sentidos plurais, como o amor de Abel . A forma sígnica está contida no palíndromo, dentro da espiral. Sua cobertura é de elementos feitos de palavras, números, símbolos. Tudo usado para destacar os signos de uma imagem fulgurante de gênero literário. Os autores trabalhados incluem Ana Luiza Andrade (2014); Hannah Arendt (2000); Gaston Bachelard (2000); Mikhail Bakhtin (1997); João Alexandre Barbosa (1974); Roland Barthes (1992; 1987); Walter Benjamin (1996); Henri Bergson (2006); Antonio Candido (2005); Gilles Deleuze (1999; 2005); Benedito Nunes (1995), entre outros. Nesse sentido, a análise teórica da escritura incide na configuração do discurso. Assim, as estruturas de composição da narrativa perpassam pelo teatro grego, com o palíndromo, característico do século III a.C. A completude segue rumo ao infinito, estabelecendo o imaginário pelos fragmentos, causando variação de focos, espaços, temporalidades e linguagens.

Durante a gravidez o sistema respiratório sofre modificações. Além da elevação do diafragma, provavelmente secundária ao aumento do volume uterino, estudos indicaram que, com a progressão da gestação algumas mudanças em volumes e capacidades pulmonares ocorrem como redução na capacidade residual funcional, volume de reserva expiratório, volume corrente e da capacidade inspiratória. Uma das hipóteses para explicar esses achados é que a elevação do diafragma pode causar colapso pulmonar, que pode ser pior em mulheres que realizaram parto cesariana (PC), quando comparadas as que tiveram parto vaginal (PV). Este estudo avaliou 20 mulheres, 2 a 5 horas após o parto em um Hospital Universitário. Após a obtenção do consentimento livre e esclarecido, 20 mulheres saudáveis, não-fumantes, onde 10 mulheres haviam realizado PV e 10 haviam realizado PC, após o parto foram submetidos à tomografia computadorizada torácica. A imagem foi analisada por um sistema de software (Osíris). A média de atenuação de cada fatia foi expresso em unidades Hounsfield (UH) e medido o percentual da área de colapso pulmonar (em g%). No grupo PV a média foi de -841,90 UH e 3,95 g%, enquanto que no grupo PC a média foi de -765,95 UH e 14,1g%. Estes resultados sugerem que as mulheres submetidas ao PC têm maior área de colapso pulmonar comparado com mulheres submetidas ao PV / During pregnancy the respiratory system undergoes several modifications. Besides the elevation of diaphragm, probably secondary to the increase in uterine volume, studies indicated that with the progression of the gestation some changes in pulmonary volumes and capacities occur, as a reduction in Functional Residual Capacity, Expiratory Reserve Volume, Tidal Volume and Inspiratory Capacity. One of the hypotheses to explain these findings is that the elevation of diaphragm may cause pulmonary collapse, which may be worse in women who underwent a cesarean section when compared to those who had vaginal delivery. This paper evaluates 20 women, 2 to 5 hours after delivery in a University Hospital. After getting informed consent, 20 healthy non-smoking women, 10 who underwent vaginal delivery (VD) and 10 who underwent a cesarean section (CS), were submitted to a chest computed tomography. The images of two different basal lung levels were analyzed by means of a software system (Osiris). The mean attenuation value of each slice in Hounsfield Units (UH) were measured and the percentage area of collapsed lung (in g%) was calculated. In the VD group the mean attenuation was - 841.90 UH and the collapsed area was 3.95 g%, while in the CS group the mean attenuation was -765.95 UH and the collapsed area was 14.1 g%. These results suggested that women who underwent a cesarean section have more collapse at basal lung levels than women who had a vaginal delivery