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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Engineering Behavior Artificial Benthic Habitats And Analysis and Design Anchoring Design Devices for Farming Cages

Ou, Rong-Chang 23 March 2002 (has links)
The purpose of this investigation was to integrate the knowledge and techniques of marine geotechnical engineering, underwater acoustic and optical observation into studying the engineering problems of artificial reefs off south-western coast of Taiwan (Fang-Liau ,Lin-Yang, Yung-An artificial reefs etc.) and the destruction of mooring system on farming cages caused by the interaction of wave-current system. The ultimate goal of this investigation was to understand the scouring activities of loosely and closely spaced artificial reefs; as well as, to evaluate the feasibility of using artificial reefs as deadweight anchoring devices for farming cages at Fang-Liau reef site. The results of this research were as follows: Fang-Liau artificial reef site: The maximum scouring depth can reach as deep as 2.2m around closely distributed reefs at this site. Only a few loosely deployed reefs were buried there, and the scouring depressions around these buried reefs had been filled up completely. To sum up, the behavior of scouring produced by the action of wave, current and typhoon around this site, merely limited to loosely distributed reefs, and the rim of closely distributed reefs. With the scouring time increasing, there were no obvious evidences for the burial of artificial reefs at this site. Lin-Yang artificial reef site: The scouring depressions around part of loosely deployed reefs expand as typhoons attacking at this site. The horizontal range of the scouring depressions can reach 92.3m in length, and parts of the reefs were buried during the process of scouring. Besides, as time went on, part of closely distributed reefs illustrated periodic variations of being buried by sediments with ripple marks, then shown up with evident height, and then buried again. To sum up, the behavior of scouring produced by the action of wave, current and typhoon around this site could cause the complete burial of the reefs. The possible procedures for the burial of reefs in the scouring depression were the actions of backfill of sandy sediments at this site. Yung-An artificial reef site: During summer time, especially with typhoons passed by, surficial sediments at this site were evident with mega ripple marks. The effects of scouring at this site were prominent than those at Fang-Liau reef site. The textures of surficial sediments were the major factor which induced this difference. Based on the considerations of safety of sliding, bearing capacity and overturning, the usage of artificial reefs as anchoring devices for farming cages could not satisfy the basic engineering requirements under the action of extreme wave and current. This research suggested the usage of cubical concrete block with shear keys for anchoring devices on farming cages. The minimum buoyant weight of this block should reach 28.8 to 38.7ton. The problem regarding construction and deployment techniques of this block need further considerations.
42

Förankra utan att kasta ankar : En uppsats om organiserandets betydelse i projektorganisationer

Lundin, Jenny, Persson, Sara January 2015 (has links)
I denna fallstudie skapas förståelse för projektorganisationers organisering. Detta har gjorts genom att inledningsvis beskriva den organisatoriska utvecklingen, där byråkrati och postbyråkrati präglar introduktionen. Problemdiskussionen förstärks genom användning av dikotomi, där grekiska mytologins gudar gestaltar organiserandets utveckling. Syftet med studien är att bidra till en nyanserad bild av hur projektorganisationer organiserar sig och anmanar system. För att möjliggöra syftet angrips fallstudien med en abduktiv forskningsansats. Fallstudien utgörs av tre projektgrupper som arbetar på uppdrag av samma huvudorganisation. Respondenternas upplevelser är av betydelse för studien och görs därmed med en kvalitativ metod. Observation och intervjuer utgör största delen av datainsamlingen. Den empiriska datainsamlingen har tolkats för att sedan kunna appliceras till en viss grad på andra projektorganisationers organisering. Det teoretiska kapitlet har tack vare valet av forskningsansats anpassats till den empiriska datainsamlingen under forskningsprocessen gång. Kapitlet redogör för grundläggande och relevant teori för att förstå projektorganisationers organisering. Empiri och analys kombineras för att kunna klargöra resonemang och förtydliga kopplingen till det teoretiska materialet. Studien har nått slutsatsen att projektorganisationer anammar omedvetet system till en högre grad än vad som förutsetts. Anledningen grundar sig att legitimitet ligger i projektorganisationers finansieringsmöjlighet, snarare än det bästa sättet att organisera sig. I samband med studien har ett nytt begrepp uppmärksammats, förankring. Konstaterandet av studien är att projektorganisationers dilemma är deras behov av att kunna förankra ett projekt hos samtliga involverade samtidigt som projektet inte begränsar förmågan att anpassa sig. / Purpose The purpose of this case study is to contribute to the theory development of ‘project organisations’.   Methodology/approach The case study advances the theory of the project organisation by applying an abductive research approach. Enabling this with a qualitative approach where focus of the primary empirical is central.   Findings This research conceptualises that ‘the project organisation’ constantly unconsciously seeks bureaucratic structure whilst organising. Two empirically driven modes ‘financing’ and ‘anchoring’ has been highlighted.   Practical implications Based on the empirical findings in this case study, further research is encouraged to find empirical support of and to develop its claims and develop theoretical knowledge.   Originality/value Despite this case study is based on an earlier theoretical observation, there is still need for theory development in the area of ‘project organisations’. By introducing ‘system’ as a concept into the studies of ‘project organisations’, this case study enables empirical data, which builds a theoretical framework, where other studies may be commence.
43

Knowledge Dynamics in Indonesian Cultural Industries : The case of Kasongan pottery cluster and Kotagede silver craft cluster in Yogyakarta Region / Dinamika pengetahuan di klaster industri budaya Indonesia : Studi kasus klaster gerabah Kasongan dan klaster kerajinan perak Kotagede di Daerah Istimewa Yogyakarta

Sekaringtyas, Pembayun January 2015 (has links)
This paper explored the knowledge dynamics of cultural industries in Yogyakarta Region. The aims of this paper are to explain how local knowledge is circulated and how new elements are added, as well as to find out how different kinds of knowledge are anchored. This thesis contributes to fill the gap of the lack of research conducted to explain knowledge dynamics in the context of Indonesian cultural industries. Cultural industries have been increasingly considered important towards economic development, whereas territorial knowledge dynamics (TKD) is considered as an update of the traditional territorial innovation models (TIM). The empirical part of this paper contains data collected from interviews with the representatives of sixteen firms, five government institutions, three local trade associations, one local youth organisation and one non-governmental organisation. The finding reveals that direct observation, face-to-face contact, and local buzz are important towards the circulation of local knowledge within the clusters. Different kinds of innovations were also found, involving multidimensional aspects at micro-levels. In a few cases, innovation was influenced by the presence of global pipelines. Knowledge anchoring happened in a complex process and involved a number of actors in multiple locations and scales. This thesis argues that policy makers should increasingly incorporate the concept of territorial knowledge dynamics (TKD) in the development of Indonesian cultural industries.
44

"In general, how do you feel today?" Self-rated health in the context of aging in India.

Hirve, Siddhivinayak January 2013 (has links)
Background Most aging research comes from the developed world. Aging research in India is focused on disease states and risk factors. Evidence on elderly health, physical performance and disability to understand the psycho-social or socio-behavioral risk is limited in India. Self-rated health (SRH) is used often in survey settings to quickly assess health status and is known to predict morbidity and mortality. The first wave of the Study on global AGEing and adult health (SAGE) survey provides an opportunity to explore the complex construct of SRH in the context of the aging process in its various key life domains of health, disability, cognition, activities of daily life, work, family, security and well-being in low and middle income settings. Objectives This research aims to (a) understand pathways through which the social environment, functional disability, health behaviour and chronic disease experience influence SRH, (b) examine the role of SRH in predicting mortality, (c) validate SRH to improve its interpersonal comparability, and (d) assess how well estimates of SRH derived directly from a ‘small area’ survey compare with ‘small area’ estimates derived indirectly from a ‘large area’ survey. Methods The Vadu Health and Demographic Surveillance System (HDSS) monitor health and demographic trends in a rural population of more than 100 000 in 22 villages in India since 2002. The full and short version of the SAGE survey was implemented in Vadu in 2007-09 among 321 and 5432 individuals aged 50 years and above, respectively. A structural equation model tested pathways through which social and biological factors influenced SRH. A Cox proportional hazard model examined the role of SRH as a predictor for mortality. Anchoring vignettes were used to evaluate SRH for reporting heterogeneity. The Hierarchical Ordered Probit model adjusted SRH for reporting heterogeneity. The SRH prevalence estimates for Vadu derived indirectly (indirect synthetic estimate, empirical Bayes estimate, Hierarchical Bayes estimate) from the national SAGE survey were compared with estimates derived directly from the Vadu SAGE survey, using different design and model-based techniques. Results Older individuals reported poor SRH compared to those younger. Women rated their quality of life and SRH poorer than men. The effect of age on SRH was mediated through functional disability. Higher socioeconomic status and higher quality of life was in turn associated with better SRH but this relationship lacked statistical significance. Smoking or consumption of tobacco was associated with at least one chronic illness which in turn was associated with poor SRH and quality of life. However the association between chronic illness and SRH and quality of life was not statistically significant. Mortality risk was higher among individuals who reported bad/very bad SRH, disability and lack of spousal support independent of age and sex. There was strong evidence of reporting heterogeneity in SRH that was influenced by age, sex, education and socioeconomic status. The prevalence of ‘good / very good’ SRH was estimated to be 50%. This direct survey estimate compared well with the prevalence estimate of about 45% derived indirectly from model-based small area estimation methods. The indirect synthetic estimate for Vadu (23.2%) was a poor approximation to the direct survey or modelbased estimate. Conclusion This research establishes the value and utility of SRH as a simple measure of health and predictor of mortality in an aging context. It provides evidence to formulate programs and policies towards an enabling social environment and an ability to function in key life domains of health and well-being. It highlights the need to identify and adjust self-rated responses for interpersonal incomparability prior to making comparisons across individuals or groups of individuals. It highlights the potential of using information from large national surveys by district level managers for planning and evaluation of policies and programs at the district or sub-district level. Finally, this research provides the basis for integrating SRH and related questions into routine HDSS.
45

PKA Signaling in ABCA1 Function: A Role in Modulation of Cholesterol Efflux and Macrophage Inflammation

Ma, Loretta T. K. 28 October 2013 (has links)
Formation of lipid-laden macrophage foam cells and inflammation are the central components in the initiation and progression of atherosclerosis. ABCA1 is well established as an anti-atherogenic factor that facilitates cellular cholesterol and phospholipid efflux, promotes reverse cholesterol transport, and suppresses pro-inflammatory cytokine secretion. Through these functions, ABCA1 is capable of reducing the lipid burden in atherosclerotic plaque. PKA signaling is an integral factor in promoting many anti-atherogenic functions of ABCA1; however, mechanistic aspects of PKA signaling associated with ABCA1 remain poorly defined. Thus, the first part of this study investigates the involvement of spatially regulated PKA signaling in ABCA1 activities through the use of st-Ht31, a PKA de-anchoring peptide. It appears that de-anchoring PKA robustly increases ABCA1-mediated microparticle release, one of the cholesterol efflux pathways of ABCA1, and reverses macrophage foam cell formation. These results highlight the significance of subcellular compartmentalization of PKA signaling in ABCA1 functions and present PKA de-anchoring as a potential therapeutic strategy for atherosclerotic lesion regression. The second part of this study provides evidence that ABCA1 activates PKA and promotes the secretion of anti-inflammatory IL-10, a cytokine crucial for inflammation resolution. Furthermore, we provide evidence that this elevated PKA activity is the underlying mechanism in which macrophage ABCA1 promotes M2-like inflammatory response. Our results also suggest that ABCA1 activates PKA by regulating cholesterol, which poises macrophages towards an anti-inflammatory or M2-activated phenotype. Collectively, we demonstrate that PKA signaling plays a crucial multifactorial role in anti-atherogenic functions of ABCA1.
46

An investigation of forecasting behaviour

Ryan, Anthony Michael January 2002 (has links) (PDF)
To manage an uncertain future relevant societal groups, such as government and corporate sectors, utilise economic forecasts to help plan future strategies. Many vital decisions are based on economic forecasts. Economists have traditionally been the professionals employed as economic forecasting experts. The dominant paradigm for present day forecasting is the "rational expectations theory", which assumes that a forecaster is capable of making optimal use all of the available information. The field of psychology offers a different, yet complementary, approach to the topic of economic forecasting. The aim of the current study was to research mental processes and behaviours of individuals participating in a forecasting task. The role of the following psychological variables within economic prediction behaviour was assessed: (1) task complexity, (2) decision making style, (3) the anchoring and adjustment heuristic, (4) the framing effect, and (5) personal feelings about the task content. All of these variables were hypothesised to have a direct influence on prediction behaviour. In addition, task complexity and decision making style were assumed to moderate the influence of the other psychological variables. A conceptual framework was designed to depict the assumed relationships. (For complete abstract open document)
47

Avaliação da vida em fadiga de um novo modelo de terminal conector para dutos flexíveis

Xavier, Flávio Galdino January 2009 (has links)
Este trabalho foca a avaliação da vida em fadiga de um novo modelo de terminal conector para dutos flexíveis (risers) de camadas não aderentes (unbonded). Os ensaios foram feitos levando em consideração apenas a parte estrutural desses dutos, de forma a ensaiar uma nova configuração de ancoragem da armadura de tração encontrada nesse equipamento conhecido como terminal conector (end fitting). É dentro deste componente que os arames da armadura de tração são fixados por resina epóxi em conjunto com uma configuração específica permitindo dessa maneira a sustentação do duto flexível quando fixado a plataformas offshore. Para a escolha do novo modelo de ancoragem aqui proposto, além de se tomar como referência, fez-se também uma analogia aos modelos utilizados nas ancoragens das barras metálicas utilizadas em concreto protendido. Isto foi feito por entender que algumas características mecânicas da resina epóxi aproximam-se das do concreto. Para a definição do novo modelo de ancoragem, uma análise simplificada, utilizando o Método dos Elementos Finitos (MEF), foi feita em dois modelos de ancoragens recomendados na API RP 17B (2002) e utilizado por alguns fabricantes, no intuito de verificar as distribuições das tensões ao longo desses arames dentro do terminal conector quando envolto pela resina epóxi. Esta análise destacou as regiões ao longo dos arames onde havia concentrações das tensões. Utilizando-se dessas informações, foi desenvolvida uma nova configuração para o arame dentro da resina de maneira a minimizar esses concentradores de tensão, permitindo assim que o modelo de ancoragem proposto tenha um melhor desempenho em fadiga. Para tanto, as verificações desses modelos feitas através do MEF e validadas através de ensaios experimentais em escala reduzida, mostraram que o modelo proposto apresentou reduções do KT da ordem de 16,5% e das tensões na resina de 60% quando comparados aos outros dois modelos comerciais. Após essas avaliações protótipos do novo terminal conector foram confeccionados em escala real e montado a dois pedaços de duto flexível de 2,5" de diâmetro, compondo assim dois corpos de prova: o CP1 e o CP2, os quais foram submetidos a ensaios de tração estáticos e carregamentos dinâmicos. Nos ensaios o CP1 foi submetido a uma carga máxima em tração de 844 kN e após esse carregamento, a não evidência de ruptura nos arames da armadura de tração o levou para o ensaio de fadiga com cargas em tração variando entre 130 e 304 kN a uma freqüência de 1Hz para uma vida de 1.000.000 de ciclos de carga. O resultado desse ensaio mostrou a viabilidade do conceito, uma vez que se atingiu a 1.000.000 de ciclos de carga sem a ruptura de qualquer arame dentro do terminal conector, evidenciado através da dissecação. Para finalizar os trabalhos, um segundo corpo de prova (CP2) foi confeccionado, obedecendo as recomendações estipuladas na API RP 17B (2002). Ensaiado com os mesmos parâmetros do CP1, se conseguiu levá-lo a fase de Dano igual a 1. Ao final desse ensaio observaram-se a ruptura de alguns arames na região mediana sobre o duto flexível que unia os dois conectores. Já as dissecações não mostraram evidências de arames rompidos internamente aos conectores. / This work focuses on the evaluation of the fatigue of life in a new model of end fitting for unbounded flexible pipe (risers). The tests had been made taking in consideration only the structural part of these risers, in order to test a new configuration of anchorage of the tensile armor found in equipment known as an end fitting. It is inside of this component that the tensile armor wires are fixed by epoxy resin in the set with specific configuration in this way allowing the sustentation these flexible pipes when the fixed offshore platforms. For the choice of the new model of anchorage considered here, beyond the reference if taking an analogy to the models used in the anchorage dues ones of the metallic bars used in prestressed concrete. This was made by understanding that some mechanical characteristics of the epoxy resin are come close to the concrete. For the definition of the new model of anchorage, the simplified analysis, using the Finite Element Method (FEM), was made in two models of anchorage dues recommended in API RP 17B (2002) and used by some manufacturers, in intention to verify the distributions tensions along the wires within of the end fitting when wrapped for the epoxy resin. This analysis highlighted the wires throughout the regions where it had concentrations of the tensions. Using these information of itself, a new configuration for the wire inside of the way resin was developed to minimize these concentrators of tension as soon as, allowing anchorage of the considered model one has better performance in fatigue. For in such a way, the verifications of these models made through the FEM and validated through experimental tests in reduced scale, had shown that the considered model presented reductions of the KT of the order of 16.5% and stress in the resin of 60% when compared with the others two commercial models. After these evaluations archetypes of connecting the new end fitting had been confectioned in real scale and mounted two pieces of flexible pipe of 2.5" of diameter, thus composing test of two bodies: the CP1 and the CP2, which had been submitted the static tension tests and dynamic loads tests. In the tests the CP1 was submitted to tension in the maximum load of 844 kN and after this shipment, the evidence of rupture in the wires of armor did not take the tension it for the tests of fatigue in traction with loads varying between 130 and 304 kN to the frequency of 1Hz for a life of 1,000,000 cycles of load. The result of this test showed the viability of the concept, that if the team reached the inside of 1,000,000 load cycles without the rupture of any wire of the end fitting, evidenced through the dissection. To finish the works, the body of the test (CP2) it was confectioned, obeying to the recommendations stipulated in API RP 17B (2002). Tested with the same parameters of CP1, were taken to the stage Damage equal to 1. To the end of this test they had observed it rupture of some wires in the region on the medium flexible pipe that joined the two end fittings. Already the dissections had not shown evidence of broken internally wires to the end fittings.
48

Proposta e análise de novos sistemas de ancoragem para End Fittings de Risers flexíveis

Lorio, Diego Andrés January 2016 (has links)
O trabalho apresentado tem como finalidade analisar os sistemas de ancoragem utilizados na fabricação de End Fittings (EF), através de ensaios de dois sistemas de ancoragem alternativos aos utilizados atualmente na indústria. Além disso, é apresentado o desenvolvimento de um modelo de elementos finitos (MEF) que permite a reprodução do comportamento durante o processo de pullout da ancoragem com melhor desempenho. A caracterização dos materiais envolvidos no sistema de ancoragem foi necessária para o desenvolvimento do modelo numérico. Desta forma, o modelo numérico conta com as propriedades elásticas e plásticas dos materiais, fator que influencia o comportamento do sistema assim como os valores de carga necessários para o arrancamento. A comparação das ancoragens propostas foi realizada a partir dos valores de força obtidos por meio de um teste de arrancamento, chamado de pullout. Para isto, arames da armadura de tração de uma linha flowline de 2,5 polegadas foram conformados de acordo à geometria das ancoragens propostas e embebidas em resina epóxi tentando, desta forma, representar de forma simplificada parte do sistema de ancoragem utilizado nos EF. O desempenho das ancoragens foi analisado a partir das curvas de força em função do deslocamento, nas quais se analisou a força máxima de pullout (força máxima de arrancamento), o deslocamento para força máxima de pullout e o valor de rigidez do sistema. Finalmente depois de selecionada a ancoragem com melhor desempenho, os valores experimentais foram comparados com os valores obtidos do modelo numérico, mostrando uma boa aproximação com valores de erro relativo para a força máxima de pullout e rigidez de -1% e 8%, respectivamente. Por fim, propõe-se como trabalho futuro a continuação nos estudos experimentais de pullout com o objetivo de aprofundar o conhecimento sobre os parâmetros que mais influenciam nestes sistemas, através da utilização de novas geometrias e materiais, assim como a normalização do processo de preparação e ensaio das amostras. / The work aims to analyze the anchoring systems used in manufacturing of flexible pipe End Fittings (EF) through the tests of two alternative anchoring systems different of the currently used in the industry. In addition, it is presented the development of a finite element model (MEF) that allows to reproduce the behavior during the pullout process of the anchoring system with the better performance. The characterization of the materials involved in the anchoring system was necessary for the development of the numerical model. In this way, the numerical model include the elastic and plastic properties of materials, factor that influence the behavior of the system as well as the force values needed for the pullout. The comparison of the proposed anchoring systems was performed from the force values obtained through a pullout test. For this, the armor wires of a flowline flexible pipe with a bore of 2.5-inch were conformed according the geometry of the anchoring systems proposed and then were fixed in epoxy resin, trying in this way to represent a simplified form of the anchoring system used in EF. The performance of the anchoring systems was analyzed from the force-displacement curves. The maximum pullout force, the offset for maximum strength of pullout and the stiffness value of the system were used for the analysis. Finally, after selected the anchoring system with better performance, the experimental values were compared with the values obtained from the numerical model. The results showed a good approximation, with a relative error for the maximum pullout force and stiffness of -1% and 8% respectively. As proposal for future works, the author proposes to continue with the experimental studies of pullout in order to enhance the knowledge about the influential parameters in these systems, through the use of new geometries and materials, as well as the standardization of the test samples preparation.
49

Avaliação da vida em fadiga de um novo modelo de terminal conector para dutos flexíveis

Xavier, Flávio Galdino January 2009 (has links)
Este trabalho foca a avaliação da vida em fadiga de um novo modelo de terminal conector para dutos flexíveis (risers) de camadas não aderentes (unbonded). Os ensaios foram feitos levando em consideração apenas a parte estrutural desses dutos, de forma a ensaiar uma nova configuração de ancoragem da armadura de tração encontrada nesse equipamento conhecido como terminal conector (end fitting). É dentro deste componente que os arames da armadura de tração são fixados por resina epóxi em conjunto com uma configuração específica permitindo dessa maneira a sustentação do duto flexível quando fixado a plataformas offshore. Para a escolha do novo modelo de ancoragem aqui proposto, além de se tomar como referência, fez-se também uma analogia aos modelos utilizados nas ancoragens das barras metálicas utilizadas em concreto protendido. Isto foi feito por entender que algumas características mecânicas da resina epóxi aproximam-se das do concreto. Para a definição do novo modelo de ancoragem, uma análise simplificada, utilizando o Método dos Elementos Finitos (MEF), foi feita em dois modelos de ancoragens recomendados na API RP 17B (2002) e utilizado por alguns fabricantes, no intuito de verificar as distribuições das tensões ao longo desses arames dentro do terminal conector quando envolto pela resina epóxi. Esta análise destacou as regiões ao longo dos arames onde havia concentrações das tensões. Utilizando-se dessas informações, foi desenvolvida uma nova configuração para o arame dentro da resina de maneira a minimizar esses concentradores de tensão, permitindo assim que o modelo de ancoragem proposto tenha um melhor desempenho em fadiga. Para tanto, as verificações desses modelos feitas através do MEF e validadas através de ensaios experimentais em escala reduzida, mostraram que o modelo proposto apresentou reduções do KT da ordem de 16,5% e das tensões na resina de 60% quando comparados aos outros dois modelos comerciais. Após essas avaliações protótipos do novo terminal conector foram confeccionados em escala real e montado a dois pedaços de duto flexível de 2,5" de diâmetro, compondo assim dois corpos de prova: o CP1 e o CP2, os quais foram submetidos a ensaios de tração estáticos e carregamentos dinâmicos. Nos ensaios o CP1 foi submetido a uma carga máxima em tração de 844 kN e após esse carregamento, a não evidência de ruptura nos arames da armadura de tração o levou para o ensaio de fadiga com cargas em tração variando entre 130 e 304 kN a uma freqüência de 1Hz para uma vida de 1.000.000 de ciclos de carga. O resultado desse ensaio mostrou a viabilidade do conceito, uma vez que se atingiu a 1.000.000 de ciclos de carga sem a ruptura de qualquer arame dentro do terminal conector, evidenciado através da dissecação. Para finalizar os trabalhos, um segundo corpo de prova (CP2) foi confeccionado, obedecendo as recomendações estipuladas na API RP 17B (2002). Ensaiado com os mesmos parâmetros do CP1, se conseguiu levá-lo a fase de Dano igual a 1. Ao final desse ensaio observaram-se a ruptura de alguns arames na região mediana sobre o duto flexível que unia os dois conectores. Já as dissecações não mostraram evidências de arames rompidos internamente aos conectores. / This work focuses on the evaluation of the fatigue of life in a new model of end fitting for unbounded flexible pipe (risers). The tests had been made taking in consideration only the structural part of these risers, in order to test a new configuration of anchorage of the tensile armor found in equipment known as an end fitting. It is inside of this component that the tensile armor wires are fixed by epoxy resin in the set with specific configuration in this way allowing the sustentation these flexible pipes when the fixed offshore platforms. For the choice of the new model of anchorage considered here, beyond the reference if taking an analogy to the models used in the anchorage dues ones of the metallic bars used in prestressed concrete. This was made by understanding that some mechanical characteristics of the epoxy resin are come close to the concrete. For the definition of the new model of anchorage, the simplified analysis, using the Finite Element Method (FEM), was made in two models of anchorage dues recommended in API RP 17B (2002) and used by some manufacturers, in intention to verify the distributions tensions along the wires within of the end fitting when wrapped for the epoxy resin. This analysis highlighted the wires throughout the regions where it had concentrations of the tensions. Using these information of itself, a new configuration for the wire inside of the way resin was developed to minimize these concentrators of tension as soon as, allowing anchorage of the considered model one has better performance in fatigue. For in such a way, the verifications of these models made through the FEM and validated through experimental tests in reduced scale, had shown that the considered model presented reductions of the KT of the order of 16.5% and stress in the resin of 60% when compared with the others two commercial models. After these evaluations archetypes of connecting the new end fitting had been confectioned in real scale and mounted two pieces of flexible pipe of 2.5" of diameter, thus composing test of two bodies: the CP1 and the CP2, which had been submitted the static tension tests and dynamic loads tests. In the tests the CP1 was submitted to tension in the maximum load of 844 kN and after this shipment, the evidence of rupture in the wires of armor did not take the tension it for the tests of fatigue in traction with loads varying between 130 and 304 kN to the frequency of 1Hz for a life of 1,000,000 cycles of load. The result of this test showed the viability of the concept, that if the team reached the inside of 1,000,000 load cycles without the rupture of any wire of the end fitting, evidenced through the dissection. To finish the works, the body of the test (CP2) it was confectioned, obeying to the recommendations stipulated in API RP 17B (2002). Tested with the same parameters of CP1, were taken to the stage Damage equal to 1. To the end of this test they had observed it rupture of some wires in the region on the medium flexible pipe that joined the two end fittings. Already the dissections had not shown evidence of broken internally wires to the end fittings.
50

Anchoring and Motivated Reasoning in Managers' Review of Accounting Estimates

January 2016 (has links)
abstract: Accounting estimates are developed in a bottom-up fashion; subordinates generate estimates that are reviewed by managers. The anchoring heuristic suggests managers may be highly influenced by subordinates’ initial estimates. However, motivated reasoning theory predicts that reporting incentives will bias managers’ review in favor of estimates that are incentive consistent, and managers will selectively attend to information that supports their preferred conclusion, including their perceptions of the subordinate. Using experimental methods I manipulate the consistency of the subordinate estimate with management reporting incentives, and the narcissistic description of the subordinate. Consistent with motivated reasoning theory, I find that managers anchor on incentive consistent subordinate estimates, regardless of subordinate narcissism, but anchor less on incentive inconsistent subordinate estimates, especially when the estimate comes from a narcissistic subordinate. I also find evidence that managers believe narcissistic subordinates act strategically in their own self-interest, and selectively attend to this belief to adjust away from incentive inconsistent subordinate estimates, but not incentive consistent subordinate estimate. My results reveal two potential weaknesses in the management review process: susceptibility to subordinate anchors, and bias created by reporting incentives. / Dissertation/Thesis / Doctoral Dissertation Accountancy 2016

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