abstract: Tesla turbo-machinery offers a robust, easily manufactured, extremely versatile prime mover with inherent capabilities making it perhaps the best, if not the only, solution for certain niche applications. The goal of this thesis is not to optimize the performance of the Tesla turbine, but to compare its performance with various working fluids. Theoretical and experimental analyses of a turbine-generator assembly utilizing compressed air, saturated steam and water as the working fluids were performed and are presented in this work. A brief background and explanation of the technology is provided along with potential applications. A theoretical thermodynamic analysis is outlined, resulting in turbine and rotor efficiencies, power outputs and Reynolds numbers calculated for the turbine for various combinations of working fluids and inlet nozzles. The results indicate the turbine is capable of achieving a turbine efficiency of 31.17 ± 3.61% and an estimated rotor efficiency 95 ± 9.32%. These efficiencies are promising considering the numerous losses still present in the current design. Calculation of the Reynolds number provided some capability to determine the flow behavior and how that behavior impacts the performance and efficiency of the Tesla turbine. It was determined that turbulence in the flow is essential to achieving high power outputs and high efficiency. Although the efficiency, after peaking, begins to slightly taper off as the flow becomes increasingly turbulent, the power output maintains a steady linear increase. / Dissertation/Thesis / M.S. Mechanical Engineering 2012

Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-08-12T13:31:38Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertação final Tulio.pdf: 2889761 bytes, checksum: 052b78ab493e64aa19addbe0117d79a0 (MD5) / Made available in DSpace on 2016-08-12T13:31:38Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertação final Tulio.pdf: 2889761 bytes, checksum: 052b78ab493e64aa19addbe0117d79a0 (MD5) Previous issue date: 2015-08-31 / CNPq / Em lajes de concreto armado sem vigas, apoiadas em pilares, a resistência à punção torna-se um ponto crítico para seu dimensionamento. Até recentemente, os modelos mecânicos para se calcular a resistência à punção das lajes de concreto armado, eram muito complexos, sem praticidade para se aplicar em projetos. O dimensionameto à punção na maioria das normas são baseados em resultados experimentais sem uma modelação física. Uma das formas de se aumentar a resistência à punção é a utilização de capitéis. Para esse trabalho foi definido a utilização de capitéis curtos. As poucas informações sobre a utilização de capitéis curtos deixam os engenheiros receosos quanto a sua utilização. O objetivo desse trabalho é elucidar mais um pouco sobre esse tipo de solução para combate à punção. É apresentado como a litetura aborda a utilização dos capitéis curtos e como a sua utilização e suas dimensões são orientadas. Também é apresentado como os métodos normativos, ACI- 318/2014, NBR 6118/2014 e FIB MODEL CODE 2010 abordam a sua utilização e dimensionamento. É selecionado um caso de uma laje submetida à punção e feito o seu dimensionamento segundo os três métodos já mencionados. Também é feita uma comparação com os resultados experimentais obtidos na literatura, os quais são poucos, com os três métodos já citados. / In flat plates without beams, supported directly on columns, punching shear strength becomes critical in design. Until recently mechanically based models for punching shear computation in reinforced concrete slabs were too complex for routine design work. Punching shear strength checks are basically empirical for most design codes, without a mechanical model basis. A possible alternative to enhance punching shear capacity is to locally increase slab thickness through shear caps or drop panels. In this work, the shear cap option is studied in detail. Due to lack of information, designers are generally wary of the usage of shear caps. This work aims at gaining a better understanding of this type of solution for punching shear strengthening. A literature review is presented on shear cap usage as well as guidance with respect to its geometry. Also presented are design check procedures according to ACI-318/2014, NBR 6118/2014 and FIB MODEL CODE 2010. A case study of a slab subjected to punching shear is selected and its design reviewed according to the three abovementioned codes. Punching shear capacity of shear caps of the very few experimental results are compared with the presented verification procedures.

Orientador: Jose Martins Filho / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas / Made available in DSpace on 2018-08-12T22:51:41Z (GMT). No. of bitstreams: 1 Filoni_Eduardo_M.pdf: 1810645 bytes, checksum: 81dd711bdd1ec2f217195d685ad014ea (MD5) Previous issue date: 2009 / Resumo: O arco longitudinal medial (ALM) desempenha funções na biomecânica do pé. O estudo teve como objetivo comparar os resultados da avaliação do ALM do complexo articular do tornozelo entre índice do arco plantar (IAP) e índice de Staheli, classificação de Viladot e linha de Feiss. Métodos que mais compatibilizaram foram o IAP e a classificação de Viladot, porém sem significância estatística, considerando o coeficiente de Kappa de 0,32 e 0,30 para os pés direito e esquerdo. Na comparação do IAP, linha de Feiss e índice de Staheli, o coeficiente de Kappa foi de baixa concordância, pois, não pode ser calculado pela ausência de pé plano nos dois últimos testes. Conclui-se que ocorreu incompatibilidade entre os métodos de avaliação / Abstract: The longitudinal plantar arch (LPA) perform biomechanics functions in the foot. The aim of this study was to compare the relationship between different index to measure the LPA of the foot. The arc in dex, Staheli index, Viladot classification and Feiss line were compared. Although non significant the higher agreement was reached between the arch index and Staheli index. This comparison presented a Cohen's Kappa coefficient of 0,32 and 0,30 for right and left foot respectively. The comparison between arch index either with Feiss line or Staheli index presented low agreement. In conclusion this study showed low agreement between methods to measure the LPA. / Mestrado / Saude da Criança e do Adolescente / Mestre em Saude da Criança e do Adolescente

Made available in DSpace on 2014-07-29T16:02:22Z (GMT). No. of bitstreams: 1 dissertacao karoline fernandes.pdf: 700169 bytes, checksum: bbcf93fe91f369b6605215c70576e124 (MD5) Previous issue date: 2010-02-26 / We will study the Finsler metric, on a manifold M, defined as the sum of a Riemannian metric and a 1-form, they are known as Randers metric. We will classify those that are locally dually flat, that is, for all point exists a coordinate system in which the equation of the geodesic has a special form, the coefficients of spray is given in terms of the metric one and a local scalar function, we will also characterize the Randers metric that is locally dually flat with almost isotropic flag curvature / Estudaremos as métricas de Finsler, em uma variedade M, definidas como soma de uma métrica Riemanniana e de uma 1-forma, elas são conhecidas como métricas de Randers. Classificaremos aquelas que são localmente dualmente flat, isto é, para todo ponto existe um sistema de coordenadas no qual a equação das geodésicas tem uma forma especial pois os coeficientes do spray são dados em termos da métrica e de uma função escalar, caracterizaremos também as métricas de Randers que são localmente dualmente flat com curvatura flag quase-isotrópica

The Andean Cordilleran orogenic system stretches over 7,000 km along the western margin of South America and serves as a useful laboratory to evaluate the causes of spatial and temporal variations in orogenic processes. Although the geology of the Andean margin is fundamentally controlled by the subduction of the Nazca plate beneath the South American plate, the style of deformation, basin morphology, exhumation history, and volcanic activity along this margin are remarkably heterogeneous in both time and space. My Ph.D. work presents new data from the Miocene – Pliocene along-strike depocenters bounding the basement block uplifts of the Sierras Pampeanas and the fold and thrust belt of the Andean Precordilleran in the south Central Andes between ca. 27.5°S and 30.5°S. I use new observations from sedimentology, detrital zircon U-Pb data, and low-temperature thermochronology to evaluate the mechanisms driving basin organization, sedimentation, and exhumation. Geohistory analysis supports flexurally controlled basins between ca. 18 and 6 Ma with detritus derived exclusively from the active Precodillera to the west. Accelerated deformation in the Precordillera produced accelerated sedimentation from ca. 10 – 8.5 Ma. A deceleration of sedimentation from ca. 6 – 5 Ma was most likely controlled by heightened aridity. Around the same time, low-temperature thermochronometers record the widespread exhumation of the foreland basin system for over 300 km along strike, this may be driven by dynamically controlled uplift related to Miocene flat-slab subduction. Low-temperature thermochronometers suggest that the geothermal gradient throughout the late Miocene was ca. 35°C/km – 25°C/km and had not been significantly depressed as previously proposed. Granite-cored ranges in the Sierras Pampeanas were sampled for low-temperature thermochronology to constrain the exhumation history of the region. Modeling of both apatite fission track and apatite (U-Th-Sm)/He thermochronometers demonstrates that these rocks have been close to the surface since the late Paleozoic. Reheating during the Cretaceous is attributed to elevated geothermal gradients due to back-arc rifting. Final exhumation (1- 2 km) occurred in the mid to late Miocene and may have been controlled by the onset of flat-slab subduction. These results suggest that the Sierras Pampeanas may have had inherited positive topography that has controlled basin organization and sediment distribution patterns since the Paleozoic.

A tear in the subducting Nazca slab is located between the end of the Pampean flat slab and normally subducting oceanic lithosphere. Tomographic studies suggest mantle material flows through this opening. The best way to probe this hypothesis is through observations of seismic anisotropy, such as shear wave splitting. We examine patterns of shear wave splitting using data from two seismic deployments in Argentina that lay updip of the slab tear. We observe a simple pattern of plate-motion-parallel fast splitting directions, indicative of plate-motion-parallel mantle flow, beneath the majority of the stations. Our observed splitting contrasts previous observations to the north and south of the flat slab region. Since plate-motion-parallel splitting occurs only coincidentally with the slab tear, we propose mantle material flows through the opening resulting in Nazca plate-motion-parallel flow in both the subslab mantle and mantle wedge.

Thesis discusses a current topic of decision making on most effective strategy of utilization of real estates. The aim of this diploma thesis is to compare the economic advantage of model-based strategies for the utilization of real estates, to identify variants of acquisition, lease, alternatively their combinations, to evaluate these variants through income, expenditures and equity, to analyze and subsequently to find the most financially effective variant of housing. In the theoretical part, there is analyzed the conceptual apparatus, but also the relevant theoretical and legislative framework. Further, the methodology of the analysis is stated, where is chosen equity as the decisive criterion. Using this criterion, the best option of real estate utilization is detected from four variants of real estate utilization from the financial point of view, while the cash flow development is monitored in the practical part of the diploma thesis. At the end of the thesis the advantages, disadvantages and risks of strategies are formulated and recommendations are made.

The aim of orthodontic treatment is to provide the patient with a good static and functional occlusion. During research that was conducted to complete a seminar on the static and functional aspects of occlusion, the author discovered that there might be a discrepancy between the goals of an ideal static occlusion, and the goals of an ideal functional occlusion. An ideal static occlusion seemed to require a flat mandibular plane and a minimal amount of overbite after active orthodontic treatment, whereas an ideal functional occlusion required a curved mandibular plane and an overbite of 4 mm to prevent cusp interferences during functional mandibular movements. The rationale behind the excessively flat mandibular plane and minimal overbite after orthodontic treatment is to compensate for the tendency of the bite to deepen during the period following orthodontic treatment. This tendency to relapse causes uncertainty about the stability of orthodontic treatment. Little research has been dedicated to examining the long-term stability of the leveled curve of Spee. In addition, there seems to be a considerable amount of controversy surrounding the long-term stability of overbite correction after orthodontic treatment. The aim of this study was to evaluate the stability of the curve of Spee and the overbite following orthodontic treatment. In addition, the relationship between the curve of Spee and the presence of anterior guidance after a period of orthodontic retention, was examined. The relationship between the overbite and the presence of anterior guidance was also examined, and the results were used to predict an ideal value for the overbite to avoid possible dental cusp interferences. Standardized digital photographs of the dental casts of 40 subjects were taken at three different stages: before treatment (T1), after orthodontic treatment (T2), and three years (mean) post-treatment. Accurate electronic measurement of the curve of Spee, using computer software, was completed for all three stages. The overbite was measured with a dial caliper. Clinical evaluation of the functional occlusion, with special reference to anterior guidance, was performed on all the subjects. Statistical analysis was carried out in search of statistical significant changes between the various stages, and possible correlations between the different variables. The results indicated that the leveling of the curve of Spee is a stable treatment procedure. The overbite was less stable than the curve of Spee, and nearly half the amount of overbite correction obtained during treatment, relapsed in the three years (mean) post-treatment. No relationship was found between the curve of Spee and the presence of anterior guidance at T3. A highly significant relationship was found between the overbite and the presence of anterior guidance. Subjects with a small overbite seemed to be predisposed to posterior interferences during mandibular protrusion. An overbite of not less than 3mm was found to be a desirable feature after orthodontic retention in order to reduce potentially interfering contacts. More research is necessary to clarify the relationship between dental interferences and temporomandibular disorders (TMD). / Dissertation (MChD (Orthodontics))--University of Pretoria, 2004. / Orthodontics / unrestricted

Premièrement, nous avons caractérisé les systèmes multi-entrées, affines par rapport aux contrôles, linéarisables dynamiquement via une pré-intégration d'un contrôle bien choisi. Ils forment une classe particulière de systèmes plats : ils ont un poids différentiel de n+m+1, où m est le nombre de contrôles et n est la dimension de l'état. Nous avons présenté des formes normales compatibles avec les sorties plates minimales et décrit toutes les sorties plates minimales. Nous avons appliqué nos résultats à plusieurs exemples. Deuxièmement, nous avons décrit les systèmes multi-entrées statiquement équivalents à une forme triangulaire compatible avec la forme multi-chaînée. Ensuite, la platitude de ces systèmes a été analysée et résolue. Nous avons discuté les singularités dans l'espace de contrôle et déterminé toutes les sorties plates. Nous avons appliqué ces résultats au système mécanique d'une pièce roulant sans glissement sur une table en mouvement. / Firstly, we study flatness of multi-input control-affine systems. We give a complete geometric characterization of systems that become static feedback linearizable after a one-fold prolongation of a suitably chosen control. They form a particular class of flat systems, that is of differential weight equal to n+m+l, where n is the dimension of the state-space and m is the number of controls. We illustrate our results by several examples. Secondly, we give a complete geometric characterization of systems locally static feedback equivalent to a triangular form compatible with the m-chained form. We analyze and solve their flatness. We discuss singularities and provide a system of first order PDE's to be solved in order to find all x-flat outputs. We illustrate our results by an application to a mechanical system: the coin rolling without slipping on a moving table.

The thesis is focused on the possibilities of housing financing in the Czech Republic. The greatest attention is paid to financing of buying of own flat emphatically small flats. In the first part, the living in own flat and renting of a flat are compared. In this part I also chracterize housing stock of the Czech Republic and the factors influencing the way of housing financing and housing demand. Second part is theoretical and it describes the possibilities of housing financing in detail. Above all there is described the building saving and the mortgage, that are the most frequent possibilities. Third part anlyses particular financial products of the various banks and monitors current bank supply. The final part contains the case study in which the problem with buying a flat is solved.