A presente reflexão tem como objetivo analisar a mútua construção entre religião e cidade. Mais especificamente, procura-se investigar como atividades, casas e crenças católicas concebem e se relacionam com espaços e atores urbanos, articulando circuitos, manchas e pedaços na cidade de São Paulo. Por outro lado, esta abordagem também visa analisar como a cidade, enquanto realidade social e historicamente construída, formatou a criação, bem como reflete-se nas atividades, casas e crenças católicas pesquisadas. O objeto empírico desta pesquisa consiste em uma organização religiosa geralmente classificada como comunidade de vida e aliança no Espírito Santo, cujo nome é Aliança de Misericórdia, analisada antropologicamente por meio do recurso teórico-metodológico etnográfico. A Aliança de Misericórdia constitui-se como ator religioso, constrói suas casas e atividades e, desse modo, se relaciona com a cidade, por meio de uma noção alargada de pobreza. Tal concepção cristã da pobreza é responsável pela formação de várias alianças, pelas quais a comunidade observada legitima e sustenta a sua atuação em diferentes domínios urbanos. Por fim, a noção de pobreza desenvolvida pela Aliança de Misericórdia implica na demonização de certos espaços e atores urbanos definidos como pobres em um sentido material, o que articula uma definição da cidade como um verdadeiro inferno, o qual procura-se evangelizar por diversos e novos métodos. / This dissertation examines the mutual construction of religion and the city. More specifically, the analysis is focused in how catholic activities, houses and beliefs conceive and are related to urban spaces and actors, articulating circuits, patches and turfs in São Paulo. On the other hand, this approach also analyses how the city, as a social reality historically constructed, framed formatted the establishment, as well as how it reflects on the catholic activities, houses and beliefs observed. The empirical object of this research consists of a religious organization usually classified as a life and alliance within the Holy Ghost community, called Mercy alliance, anthropologically analyzed by means of the ethnographic theoretical and methodological resource (method). The Mercy Alliance is constituted as a religious actor, which establishes its houses and activities, therefore relating itself to the city, by means of a broad notion of poverty. This Christian notion of poverty is responsible for the making of several alliances, on which the observed community legitimates and supports its actions in different urban domains. Finally, the notion of poverty developed by the Mercy Alliance engenders the demonization of certain urban spaces and actors, classified as poor in a material sense, thus articulating a definition of the city as hell that shall be evangelized by new and different methods.

Submitted by Maicon Juliano Schmidt (maicons) on 2015-05-29T14:12:56Z No. of bitstreams: 1 Michael Abrantes Kerr.pdf: 4793092 bytes, checksum: 4f190ddbdd6b2d5762a7a8400dddd6f4 (MD5) / Made available in DSpace on 2015-05-29T14:12:56Z (GMT). No. of bitstreams: 1 Michael Abrantes Kerr.pdf: 4793092 bytes, checksum: 4f190ddbdd6b2d5762a7a8400dddd6f4 (MD5) Previous issue date: 2015-02-26 / Nenhuma / Esta tese tem por objetivo refletir acerca de uma tendência espectral existente no audiovisual neobarroco contemporâneo, em específico naquele que circula no YouTube. A afirmação da existência de tal tendência é decorrente da percepção de que neste cenário há uma mistura de diferentes tipos de imagens em vídeos montados com imagens de arquivo e em vídeos tecnicamente originais (gravados com câmera) que buscam referências claras em materiais feitos anteriormente. Além disso, por contágio, observa-se um recorrente retorno de imagens, diretas ou indiretas, por repetição ou por diferença, que vêm criando um “estado-fantasma” imagético, no qual vivem, morrem e se movimentam as imagens. Os fantasmas são (ou não) reconhecidos na memória por conta de imagens-lembrança do que vemos naquilo que nos olha. Esses vídeos se encontram, lado a lado e anacronicamente, na mesma interface (a do YouTube), e disputam igualitariamente o interesse de espectadores-usuários. As montagens praticadas foram aqui analisadas e consteladas, pelo viés fantasmagórico, nas seguintes imagens dialéticas: imagem-de-arquivo, imagem-fantasma direta, imagem-fantasma indireta e imagem-fantasma indefinida. A metodologia utilizada implicou a articulação de procedimentos intuitivos (Bergson), cartográficos (Benjamin), desconstrutivos (Derrida) e dissecatórios (Kilpp). / This thesis aims to reflect about an existing spectral trend in contemporary neo-baroque audiovisual, in particular the one circulating on YouTube. The affirmation of the existence of such a trend is due to the perception that in this setting there is a mixture of different types of video footage mounted with archival footage and technically original videos (recorded with camera) seeking clear references in previously made material. In addition, by contagion, there is a recurring return of images, directly or indirectly, by repetition or by difference, that are creating an imagistic "ghost-state", in which the images live, die and move around. The ghosts are (or not) recognized in memory for remembrance images of what we see in what looks at us. These videos are, side by side and anachronistically, in the same interface (YouTube), and compete equally for the interest of viewers-users. The montages were analyzed and organized into a constellation, through a ghostly bias, in the following dialectical images: file-image, direct ghost-image, indirect ghost-image and undefined ghost-image. The methodology employed involved the articulation of intuitive (Bergson), cartographic (Benjamin), deconstructive (Derrida) and dissecative (Kilpp) procedures.

O modo de produção capitalista, através de seus mecanismos de expansão, traz como expediente mais latente a acumulação de infindáveis bens e a exacerbação do uso dos recursos naturais, fator desencadeado pelo consumo. As festas populares, uma das categorias e formas de expressão das culturas subalternas calcadas na historicidade, estão submetidas à avalanche das ideologias propagadas pela comunicação midiática. Isto fragiliza sobremaneira os atributos culturais destas manifestações, colocando em risco práticas libertárias que operam à revelia do grande capital e que estão centradas no cotidiano. O estudo das festas populares em questão, a Festa do Divino Espírito Santo e a Festa do Pinhão da Estância Climática de Cunha, visa enaltecer o elo entre identidade cultural e culturas subalternas. Esta relação se revela como prodigioso instrumento de comunicação que, através de meios materiais e simbólicos, transmitem ao longo do tempo um diverso legado fundamentado nas relações entre as comunidades e a natureza. As práticas festivas demonstram, doravante, um potencial pleno para a realização da consciência dos sujeitos receptores. Como objetos cognoscíveis do conhecimento as festas populares são expressas e reveladas no contexto acadêmico com o fito altaneiro de contribuir para as teorias da cultura e da comunicação. / The way of capitalist production, through its mechanisms of expansion, brings as expeditious more latent the accumulation of endless goods and the exacerbation of the use of the natural resources, factor unchained for the consumption. The popular feasts, one of the categories and forms of expression of the subordinate cultures sidewalk in the history, are submitted to the avalanche of the ideologies propagated for the media communication. This frail excessively the cultural attributes of these manifestations, placing at risk practical libertarians who operate to the default of the great capital and they are centered in the daily one. The study of the popular feasts in question, the Feast of the Holy Ghost Saint and the Feast of the Nut of the Climatic Station of Cunha, it aims at to exalt the link between cultural identity and popular feasts. This relation if discloses as prodigious instrument of communication that, through half as symbolic materials and, transmits throughout the time a diverse cultural legacy based on the relations between the social groups and the nature. Practical the festive ones demonstrate, following, a full potential for the usage of the conscience of the receiving citizens. As objects of the knowledge they show in the academic context a look with in the high spirits to contribute for the theories of the culture and the communication.

Snap-through is a striking instability in which an elastic object rapidly jumps from one state to another. It is seen in the leaves of the Venus flytrap plant and umbrellas flipping on a windy day among many other examples. Similar structures that snap-through are used to generate fast motions in soft robotics, switches in micro-scale electronics and artificial heart valves. Despite the ubiquity of snap-through in nature and engineering, its dynamics is usually only understood qualitatively. In this thesis we develop analytical understanding of this dynamics, focussing on how the mathematical structure underlying the snap-through transition controls the timescale of instability. We begin by considering the dynamics of 'pull-in' instabilities in microelectromechanical systems (MEMS) - a type of snap-through caused by electrostatic forces in which the motions are dominated by fluid damping. Using a lumped-parameter model, we show that the observed time delay near the pull-in transition is a type of critical slowing down - a so-called 'bottleneck' due to the 'ghost' of a saddle-node bifurcation. We obtain a scaling law describing this slowing down, and, in the process, unify a large range of experiments and simulations that exhibit delay phenomena during pull-in. We also investigate the pull-in dynamics of MEMS microbeams, extending the lumped-parameter approach to incorporate the details of the beam geometry. This provides a model system in which to understand snap-through of a continuous elastic structure due to external loading. We develop a perturbation method that systematically exploits the proximity to pull-in to reduce the governing equations to a simpler evolution equation, with a structure that highlights the saddle-node bifurcation. This allows us to analyse the bottleneck dynamics in detail, which we compare with previous experimental and numerical data. The remainder of the thesis is concerned with the dynamics of snap-through in macroscopic systems. In particular, we explore the extent to which dissipation is required to explain anomalously slow snap-through. Considering an elastic arch as an archetype of a snapping system, we use the perturbation method developed earlier to show that two bottleneck regimes are possible, depending delicately on the relative importance of external damping. In particular, we show that critical slowing down occurs even in the absence of damping, leading to a new scaling law for the snap-through time that is confirmed by elastica simulations and experiments. In many real systems material viscoelasticity is present to some degree. Finally, we examine how this influences the snap-through dynamics of a simple truss-like structure. We present a regime diagram that characterises when the timescale of snap-through is controlled by viscous, elastic or viscoelastic effects.

<p>This thesis deals with different aspects of string and /p/-brane theories. One of the motivations for string theory is to unify the forces in nature and produce a quantum theory of gravity. /p/-branes and related objects arise in string theory and are related to a non-perturbative definition of the theory. The results of this thesis might help in understanding string theory better. The first part of the thesis introduces and discusses relevant topics for the second part of the thesis which consists of five papers.</p><p>In the three first papers we develop and treat a perturbative approach to relativistic /p/-branes around stretched geometries. The unperturbed theory is described by a string- or particle-like theory. The theory is solved, within perturbation theory, by constructing successive canonical transformations which map the theory to the unperturbed one order by order. The result is used to define a quantum theory which requires for consistency d = 25 + p dimensions for the bosonic /p/-branes and d = 11 for the supermembrane. This is one of the first quantum results for extended objects beyond string theory and is a confirmation of the expectation of an eleven-dimensional quantum membrane.</p><p>The two last papers deal with a gauged WZNW-approach to strings moving on non-trivial space-times. The groups used in the formulation of these models are connected to Hermitian symmetric spaces of non-compact type. We have found that the GKO-construction does not yield a unitary spectrum. We will show that there exists, however, a different approach, the BRST approach, which gives unitarity under certain conditions. This is the first example of a difference between the GKO- and BRST construction. This is one of the first proofs of unitarity of a string theory in a non-trivial non-compact space-time. Furthermore, new critical string theories in dimensions less then 26 or 10 is found for the bosonic and supersymmetric string, respectively.</p>

Real-world radiance values can range over eight orders of magnitude from starlight to direct sunlight but few digital cameras capture more than three orders in a single Low Dynamic Range (LDR) image. We approach this problem using established High Dynamic Range (HDR) techniques in which multiple images are captured with different exposure times so that all portions of the scene are correctly exposed at least once. These images are then combined to create an HDR image capturing the full range of the scene. HDR capture introduces new challenges; movement in the scene creates faded copies of moving objects, referred to as ghosts. Many techniques have been introduced to handle ghosting, but typically they either address specific types of ghosting, or are computationally very expensive. We address ghosting by first detecting moving objects, then reducing their contribution to the final composite on a frame-by-frame basis. The detection of motion is addressed by performing change detection on exposure-normalized images. Additional special cases are developed based on a priori knowledge of the changing exposures; for example, if exposure is increasing every shot, then any decrease in intensity in the LDR images is a strong indicator of motion. Recent Superpixel over-segmentation techniques are used to refine the detection. We also propose a novel solution for areas that see motion throughout the capture, such as foliage blowing in the wind. Such areas are detected as always moving, and are replaced with information from a single input image, and the replacement of corrupted regions can be tailored to the scenario. We present our approach in the context of a panoramic tele-presence system. Tele-presence systems allow a user to experience a remote environment, aiming to create a realistic sense of "being there" and such a system should therefore provide a high quality visual rendition of the environment. Furthermore, panoramas, by virtue of capturing a greater proportion of a real-world scene, are often exposed to a greater dynamic range than standard photographs. Both facets of this system therefore stand to benefit from HDR imaging techniques. We demonstrate the success of our approach on multiple challenging ghosting scenarios, and compare our results with state-of-the-art methods previously proposed. We also demonstrate computational savings over these methods.

Real-world radiance values can range over eight orders of magnitude from starlight to direct sunlight but few digital cameras capture more than three orders in a single Low Dynamic Range (LDR) image. We approach this problem using established High Dynamic Range (HDR) techniques in which multiple images are captured with different exposure times so that all portions of the scene are correctly exposed at least once. These images are then combined to create an HDR image capturing the full range of the scene. HDR capture introduces new challenges; movement in the scene creates faded copies of moving objects, referred to as ghosts. Many techniques have been introduced to handle ghosting, but typically they either address specific types of ghosting, or are computationally very expensive. We address ghosting by first detecting moving objects, then reducing their contribution to the final composite on a frame-by-frame basis. The detection of motion is addressed by performing change detection on exposure-normalized images. Additional special cases are developed based on a priori knowledge of the changing exposures; for example, if exposure is increasing every shot, then any decrease in intensity in the LDR images is a strong indicator of motion. Recent Superpixel over-segmentation techniques are used to refine the detection. We also propose a novel solution for areas that see motion throughout the capture, such as foliage blowing in the wind. Such areas are detected as always moving, and are replaced with information from a single input image, and the replacement of corrupted regions can be tailored to the scenario. We present our approach in the context of a panoramic tele-presence system. Tele-presence systems allow a user to experience a remote environment, aiming to create a realistic sense of "being there" and such a system should therefore provide a high quality visual rendition of the environment. Furthermore, panoramas, by virtue of capturing a greater proportion of a real-world scene, are often exposed to a greater dynamic range than standard photographs. Both facets of this system therefore stand to benefit from HDR imaging techniques. We demonstrate the success of our approach on multiple challenging ghosting scenarios, and compare our results with state-of-the-art methods previously proposed. We also demonstrate computational savings over these methods.

Despite the high cost of memory and CPU time required to resolve the boundary layer, a viscous unstructured grid solver has many advantages over a structured grid solver such as the convenience in automated grid generation and shock or vortex capturing by solution adaption. Since the geometry and flow phenomenon of a helicopter are very complex, unstructured grid-based methods are well-suited to model properly the rotor-fuselage interaction than the structured grid solver. In present study, an unstructured Cartesian grid solver is developed on the basis of the existing solver, NASCART-GT. Instead of cut-cell approach, immersed boundary approach is applied with ghost cell boundary condition, which increases the accuracy and minimizes unphysical fluctuations of the flow properties. The standard k-epsilon model by Launder and Spalding is employed for the turbulence modeling, and a new wall function approach is devised for the unstructured Cartesian grid solver. It is quite challenging and has never done before to apply wall function approach to immersed Cartesian grid. The difficulty lies in the inability to acquire smooth variation of y+ in the desired range due to the non-body-fitted cells near the solid wall. The wall function boundary condition developed in this work yields stable and reasonable solution within the accuracy of the turbulence model. The grid efficiency is also improved with respect to the conventional method. The turbulence modeling is validated and the efficiency of the developed boundary condition is tested in 2-D flow field around a flat plate, NACA0012 airfoil, axisymmetric hemispheroid, and rotorcraft applications. For rotor modeling, an actuator disk model is chosen, since it is efficient and is widely verified in the study of the rotor-fuselage interaction. This model considers the rotor as an infinitely thin disk, which carries pressure jump across the disk and allows flow to pass through it. The full three dimensional calculations of Euler and RANS equations are performed for the GT rotor model and ROBIN configuration to test implemented actuator disk model along with the developed turbulence modeling. Finally, the characteristics of the rotor-fuselage interaction are investigated by comparing the numerical solutions with the experiments.

Liquid sloshing with unrestrained free surface in a moving container is associated with various engineering problems, such as tankers on highways, liquid oscillations in large storage tanks caused by earthquakes, sloshing of liquid cargo in ocean-going vessels, and the motion of liquid fuel in aircraft and spacecraft. The purpose of this study is to develop a three-dimensional (3D) numerical wave tank with or without internal structures to investigate the mechanism of liquid sloshing and the interaction between the fluid and internal structures. The developed 3D time-independent finite difference method is applied on solving liquid sloshing in tanks with or without the influence of baffles under the ground motion of six-degrees of freedom. The 3D Navier-Stokes equations were solved and transformed to a tank-fixed coordinate system, and the fully nonlinear kinematic and dynamic free surface boundary conditions for fluid sloshing in a rectangular tank with a square base were considered. The fluid is assumed incompressible in this study. The complicated interaction in the vicinity of the fluid-structure interface was solved by implementing one dimensional ghost cell approach and the stretching grid technique near the fluid-structure boundaries were used to catch the detailed evolution of local flow field. A PC-cluster was established by linking several single computers to reduce the computational times due to the implementation of the 3D numerical model. The Message Passing Interface (MPI) parallel language and MPICH2 software were utilized to code the computer codes and to carry out the circumstance of parallel computation, respectively. The developed numerical scheme was verified by rigorous benchmark tests. Not only the reported analytical, numerical and experimental studies were compared with the present numerical results, the experimental investigation was also involved in the present work to further validate the accuracy of the numerical scheme. All the benchmark tests of this study showed excellent accuracy of the developed numerical scheme. For a tank without internal structures, the coupled motions of surge and sway are simulated with various excitation angles, excitation frequencies and water depths. The characteristics of sloshing waves are dissected in terms of the classification of sloshing wave types, sloshing amplitude, beating phenomenon, sloshing-induced forces and energy transfer of sloshing waves. Six types of sloshing waves, named single-directional, diagonal, square-like, swirling-like, swirling and irregular waves, were found and classified in the present study and the occurrence of these waves are tightly in connection with the excitation frequency of the tank. The effect of excitation angle on the characteristics of sloshing waves is explored and discussed, especially for swirling waves. The spectral analyses of sloshing displacement of various sloshing waves are examined and a clear evidence of the correlation between sloshing wave patterns and resonant modes of sloshing waves are demonstrated. The mechanism of switching direction of swirling waves is discussed by investigating the situation of circulatory flow, the instantaneous free surface, the gravitational effect and the instantaneous direction of external forcing. The coupling effects of heave, surge and sway motions were also included in this study and the result showed an unstable influence of heave motion on the kinematic and dynamic characteristics of sloshing waves when the vertical excitation frequency of the tank is twice as large as the fundamental natural frequency. Except irregular waves, the other types of sloshing waves are converted into swirling waves due to the effect of heave motion. The study related to tuned liquid damper (TLD) in 2D and 3D tanks were considered. A comprehensive investigation for a 2D tank with vertically tank bottom-mounted baffles (baffled tank) are demonstrated and discussed with respect to the influence of baffle height on the natural mode of the tank, the evolution of vortices and vortex shedding phenomenon, the relationship between the vortex shedding frequency and the excitation frequency of the tank, the vortex size generated in the vicinity of the baffle tip, the interaction of vortices inside the tank. The baffle height shows a significant influence on the shift of the first natural frequency of the baffled tank and the liquid depth also plays an important part in determining this influence. In other words, the shift of the first natural mode due to various baffle height is varied with water depths. The design of two baffles separated by 0.2 times the tank breadth is an efficient tool to not only reduce the sloshing amplitude but switch the first natural frequency of the tank. The sloshing displacement is affected distinctly by different numbers of baffles mounted vertically on the tank bottom. The more baffles mounted onto the tank bottom, the smaller the sloshing displacement is presented in both the transient and steady-state periods. The processes of the evolution of vortices near the baffle tip are categorized into four phases: the formation of separated shear layer and generation of vortices, the formation of a vertical jet and shedding of vortices, the interaction between shedding vortices and sloshing flow (the generation of snaky flow) and the interaction between snaky flow and sloshing waves. Vortex shedding phenomenon due to stronger vertical jets occurs when the excitation frequency is close to the first natural mode of the baffled tank. The size of the vortex generated near the baffle tip is discussed and the vortex size is closely correlated with the baffle height. Two types of 3D tuned liquid dampers, a vertically tank bottom-mounted baffle and a vertical plate, are discussed for a tank under coupled surge-sway motions. The wave types of diagonal and single-directional waves switch to the swirling type due to the influence of the baffle. The phenomenon of square-like waves or irregular waves coexisting with swirling waves is found in the baffled tank under diagonal excitation. The baffle and the vertical plate mounted parallel to the east (west) wall of the tank can effectively reduce the sloshing amplitude when the excitation angle is between 0 degree and 10 degree and the corresponding sloshing displacement in the sway (z) direction becomes more dominant with the increase of the excitation angle. The shift of the first natural mode of the baffled tank due to various baffle heights in the x direction is dominated in this design of baffled tank. The length of the plate can cause a significant influence on not only the variation of the natural frequencies but the type of the sloshing waves. The influence of the vertical plate on the irregular waves is insignificant and several peaks appear in the spectral analysis of the sloshing displacement for the irregular waves and the numbers of peaks are more than that of the baffled tank.

L'objet de cette thèse a été de développer un code de calcul pour la simulation d'écoulements diphasiques de fluides non miscibles, incompressibles et isothermes afin de l'appliquer au phénomène de fragmentation d'un jet liquide, et plus particulièrement à la désintégration assistée d'une nappe de liquide par deux écoulements d'air portés à haute vitesse.<br /><br />Les choix des hypothèses physiques et des schémas numériques associés ont été fait afin de respecter au mieux la physique complexe de brisure d'un jet liquide. La résolution des équations de Navier-Stokes incompressibles est faite de façon directe par le biais d'une méthode de projection. La méthode naissante et prometteuse Level-Set assure quant à elle le suivi numérique de la surface de séparation entre deux fluides non miscibles. Enfin, la méthode Ghost Fluid permet un traitement correct des discontinuités à la traversée de l'interface en préservant au niveau discret les conditions de saut entre équilibre des forces de capillarité, de pression et de viscosité. Les bonnes aptitudes de tels schémas numériques sont montrées à travers une batterie de cas tests académiques.<br /><br />Les mécanismes physiques mis en jeu lors de l'atomisation primaire d'un jet liquide ont fait l'objet de nombreuses études théoriques et expérimentales. Les instabilités se développant à la surface du liquide sont multiples et clairement tridimensionnelles. Actuellement et malgré beaucoup d'efforts de recherche, aucune théorie ou modèle ne rend compte rigoureusement de ce phénomène. Or, il est montré que l'outil numérique peut apporter une lumière nouvelle. Par exemple, l'impact de la couche limite gazeuse sur la fréquence d'oscillation est étudié. Nous avons également pu retrouver par la simulation la dynamique ligamentaire intrinsèque à la désintégration assistée d'un jet liquide.