Submitted by Benjamin Rosenthal (benjamin.rosenthal@fgv.br) on 2014-04-07T12:41:16Z No. of bitstreams: 1 tese para depósito.pdf: 2068891 bytes, checksum: ba0ae7bd915046b5ba93e4f351e94da4 (MD5) / Approved for entry into archive by Vera Lúcia Mourão (vera.mourao@fgv.br) on 2014-04-07T16:08:50Z (GMT) No. of bitstreams: 1 tese para depósito.pdf: 2068891 bytes, checksum: ba0ae7bd915046b5ba93e4f351e94da4 (MD5) / Made available in DSpace on 2014-04-07T16:09:39Z (GMT). No. of bitstreams: 1 tese para depósito.pdf: 2068891 bytes, checksum: ba0ae7bd915046b5ba93e4f351e94da4 (MD5) Previous issue date: 2014-03-14 / In this thesis I investigate the extent to which companies can build a more communal environment out of their fan pages while also evaluating the corresponding brand value that may come from having such a communal environment. My research is comprised in three articles: in the first article, I describe how the brand image is created or augmented in the fan page environment, therefore providing demonstrable evidence of value creation. In the second article, I describe how individuals use fan page semiotic elements to communicate their identities. Finally, in the third article, I describe the possible communal characteristics of a fan page and the conditions that enable it to evolve to the virtual brand community concept. As a result, I will contribute to the marketing literature on the use of Facebook for communicating brand identity, on the co-creation of the brand image in social media context, and on the conceptual definition of fan pages as a communal environment.

Made available in DSpace on 2010-04-20T20:51:50Z (GMT). No. of bitstreams: 3 100838.PDF.jpg: 11511 bytes, checksum: 2bd1fc4444196b04bae8ef079eeef97b (MD5) 100838.PDF: 13256567 bytes, checksum: 03b8b6ddc6c5f11298940128cd32f385 (MD5) 100838.PDF.txt: 322570 bytes, checksum: 032780f75c07f1c57a838014d4fc8d67 (MD5) Previous issue date: 2004-12-09T00:00:00Z / Dados os altos níveis de competitividade que caracterizam a maioria dos mercados contemporâneos, muito tem sido estudado a respeito da lealdade, comprometimento e retenção de consumidores na literatura de marketing. As estratégias propostas focam a conquista de consumidores comprometidos afetivamente com as marcas, que entre outros benefícios seriam responsáveis por espontaneamente defendê-la e divulgá-la. Observando o fenômeno pós-industrial do agrupamento de pessoas em torno de padrões de consumo próximos, e em alguns casos mais extremos, em torno de uma marca em específico, alguns estrategistas propuseram a criação de comunidades de marca como forma de retenção de seus clientes atuais e mesmo de atração de novos. No setor do entretenimento estas comunidades são muito características e apresentam-se de forma evidenciada através dos inúmeros fã-clubes que podem ser encontrados. Além desta característica, observa-se também que no setor do entretenimento há uma maior evidência e concentração dos consumidores comprometidos, os fãs devotos. Assim, com o objetivo de ajudar na compreensão da relação das comunidades de marca com a lealdade de clientes, buscou-se compreender o papel do fã-clube para um consumidor que individualmente já apresenta um comportamento comprometido, o fã devoto. Entre as diversas possibilidades de fã-clubes dentro do setor, optou-se por estudar o caso de uma celebridade, pela importância cultural e econômica que a fama tem na sociedade pós-industrial. Assim sendo, como objetivo secundário, o trabalho chama a atenção para as relações de consumo deste tipo específico de produto, a celebridade. O estudo de caso foi realizado com o cantor Daniel e seus fã-clubes. De fato, o estudo levantou que o comprometimento afetivo do fã devoto se dá pelo processo de sacralização da marca que ocorre em âmbito individual. Assim, neste trabalho não se evidenciou o fã-clube como gerador do comprometimento afetivo com a marca. Este é um evento que se mostrou ocorrer anterior e independentemente da agremiação. Porém, nos limites do caso estudado, o fã-clube demonstrou ser fundamental para a manutenção e intensificação deste tipo de comprometimento. Ao representar o locus privilegiado para a realização de procedimentos de sustentação da sacralização da marca, através dos rituais, peregrinações e sacrifícios coletivos, o fã-clube mantém operante o antecedente que gerou o comprometimento afetivo deste fã. A intensificação do comprometimento através do fã-clube acontece porque ele proporciona para o fã um senso de comunidade, nutrido tanto pelos rituais como pelos sensos de pertencimento e responsabilidade moral que se estabelecem entre os membros. Fica claro, então, que apesar das vantagens estratégicas de um fã-clube, quando criado pela empresa ele perde a característica de comunidade de marca e passa a representar mais um programa de relacionamento e fidelidade, assumindo um inerente interesse comercial. Este “clube de fãs” não demonstra funcionar plenamente como uma comunidade de marca porque uma vez que os significados são atribuídos pelos consumidores, a empresa não domina o processo de sacralização. O fã-clube, enquanto comunidade de marca, não pode ser criado nem gerenciado pela empresa. A empresa pode, porém, dar suporte e incentivo para que o ciclo de vida desta comunidade se prolongue. / Given the high level of competition that is typical in most contemporary markets, much has been studied in marketing literature regarding loyalty, commitment and retention of consumers. The focus of strategies that have been proposed is the conquering of consumers emotionally committed to the brands, who, amongst other benefits, would be responsible for spontaneously defending and divulging them. By observing the postindustrial phenomenon of grouping of people around similar consumption patterns and, in some extreme cases, around a specific brand, some strategists have proposed the creation of brand communities as a way to retain their current clients and even attract new ones. In the entertainment sector, these communities are quite typical and appear in a very evident way thorugh numerous fan clubs. Besides such characteristic, it is also possible to observe that in this sector there is much more evidence and concentration of committed consumers, the so-called devoted fans. Thus, in order to aid the comprehension of the relationship between brand communities and consumers loyalty, we have pursued to understand the role played by a fan club towards a consumer that individually already shows a behavior of commitment, i.e. a devoted fan. Amongst the various possible forms of fan clubs in this sector, we have chosen to study the case of a celebrity, taking into consideration the cultural and economic importance that fame has in post-industrial society. Therefore, as a secondary objective, this work focuses on the consumption relationships of this specific kind of product, the celebrity. The study case has been done based on the singer Daniel and his fan clubs. In fact, this study has concluded that the emotional commitment of a devoted fan takes place through the process of sacralization of the brand on the individual level. Thus, in the present study, a fan club has not proven to be a generator of affective commitment to the brand. Such is an event that takes place prior to and independently from the grouping process. However, within the boundaries of this study case, fan clubs have shown to be essential to maintain as well to intensify such kind of commitment. By representing the ideal locus to perform proactive sustaining behaviors through rituals, pilgrimage and collective sacrifices, fan clubs keep alive the antecedent that generated fans affective commitment. The intensification of fans commitment through fan clubs occurs due to the fact fan clubs offer sense of community, nurtured both by rituals and by the senses of belonging and of moral responsibility that takes places amongst the members. As a result, it becomes clear that despite of the strategic advantages of a fan club, when created by the marketer, it looses its characteristics of brand community and turns to be a representation of just another relationship and loyalty program, assuming an intrinsic commercial interest. Such fan club does not prove to fully operate as a brand community in view of the fact that, once meanings are attributed by consumers, the marketer does not lead the sacralization process. The fan club, as a brand community, cannot be created or managed by the marketer. However, it may provide support and incentive so that the life cycle of such community is prolonged.

The thesis thematizes the antihero phenomenon in current television series, whereas the phenomenon mentioned is attempted to be explained by a qualitative reception research regarding the television series called Breaking Bad. Therefore, the aim of this research is to understand the motivations of viewers for selecting and watching series featuring a main protagonist that might be described as an antihero. It is thus a type of audience research that is attempting to identify the aspects that are the most attractive for audience of these kinds of narratives. Furthermore this thesis is trying to clarify viewer's attitudes towards antihero as a type of serial character, as it becomes apparent that these characters are becoming more popular than ever before. The results of this research offer an evaluation of viewer's motivations for watching the series featuring antiheroes and identification of aspects that are the most attractive for audience of these kinds of narratives.

Les énergies fossiles sont largement utilisées depuis les années 1900 pour satisfaire l’augmentation mondiale de la demande d’énergie. Cependant, la combustion est un procédé qui libère des polluants comme le CO2 et les NOx. Un des principaux challenges du 21ème siècle est de réduire ces émissions et les constructeurs automobiles sont impliqués dans cette course. Pour augmenter le rendement des moteurs à pistons, des solutions techniques, tels que le "downsizing", sont développées. Cette technique consiste à réduire la cylindrée des moteurs tout en maintenant leurs performances grâce à un turbocompresseur qui permet d’augmenter la masse enfermée dans la chambre de combustion. Malheureusement, l’augmentation de la pression dans les cylindres induite par le turbocompresseur est à l’origine de combustions anormales : des variations cycles à cycles importantes apparaissent, les gaz frais peuvent s’auto-allumer (allumage avant le claquage de la bougie) entrainant des phénomènes de cliquetis ou de rumble. La Simulation aux Grandes Echelles (SGE) a déjà prouvé qu’elle était un outil fiable pour prédire ces combustions anormales. Cependant ces calculs reposent sur des modèles pour prédire la propagation de la flamme dans la chambre de combustion. Ces modèles sont généralement issus de corrélations réalisées dans des cas où la turbulence est supposée homogène et isotrope. Définir théoriquement ou numériquement une telle turbulence est relativement simple mais expérimentalement la tâche est plus délicate. Cette thèse s’intéresse à un dispositif classiquement utilisé: une enceinte fermée dans laquelle la turbulence est générée par des ventilateurs. L’objectif de ce travail est donc double: 1. caractériser la turbulence générée dans ce type d’enceinte pour vérifier si elle est homogène et isotrope. 2. caractériser finement la combustion, laminaire et turbulente, afin d’enrichir les connaissances dans ce domaine et ainsi améliorer les modèles utilisés. Une première étude sur la propagation des flammes laminaires a été menée. Elle présente les effets de l’étirement et du confinement sur la vitesse de flamme laminaire. La principale difficulté pour la simulation de l’enceinte complète consiste à trouver une méthode numérique permettant de reproduire précisément l’écoulement généré par un ventilateur mais aussi d’en gérer plusieurs simultanément. Deux méthodes ont alors été testées. Premièrement, une méthode type Frontières Immergées a été implémentée dans le code de calcul AVBP. Malgré les bons résultats obtenus sur des cas tests simples, cette méthode ne s’est pas montrée adaptée pour reproduire précisément l’écoulement généré par un seul ventilateur. Une autre approche, provenant du monde du calcul des turbomachines, et basée sur le couplage de codes (appelée MISCOG), a quant à elle démontré ses capacités à le faire et est donc utilisée pour calculer l’écoulement généré par les six ventilateurs à l’intérieur de l’enceinte. L’écoulement non réactif est d’abord analysé: les résultats montrent qu’il existe une zone d’environ 6 cm de diamètre au centre de l’enceinte dans laquelle la vitesse moyenne de l’écoulement est proche de zéro et dans laquelle la turbulence est quasiment homogène et isotrope. Enfin, le pré-mélange de gaz frais est allumé en déposant un noyau de gaz chauds au centre de l’enceinte et la phase de propagation turbulente est analysée. En particulier, il est montré que la température des gaz brulés déposés au moment de l’allumage est un paramètre critique. / Fossil energy is widely used since the 1900s to satisfy the global increasing energy demand. However, combustion is a process releasing pollutants such as CO2 and NOx. One of the major challenges of the 21th century is to reduce these emissions and car manufacturers are involved in this race. To increase fuel efficiency of piston engines, some technical solutions are developed such as ‘downsizing’. It consists in reducing the engine size while maintaining its performances using a turbocharger to increase the trapped mass in the combustion chamber. Unfortunately, downsizing can lead to abnormal combustions: intense cycle to cycle variations can appear, the fresh mixture can auto-ignite (ignition before spark-plug ignition) leading to knock or rumble. Large Eddy Simulation has proven to be a reliable tool to predict these abnormal combustions in real engines. However, such computations are performed using models to predict the flame propagation in the combustion chamber. Theses models are generally based on correlations derived in cases where turbulence is assumed to be homogeneous and isotropic. Defining theoretically or numerically such a turbulence is a simple task but experimentally it is more challenging. This thesis focuses on a apparatus used in most experimental systems: fans stirred vessel. The objective of this work is twofold: 1. characterize the turbulence generated inside the vessel to check wether it is homogeneous and isotropic or not, 2. finely characterize laminar and turbulent combustion in this setup in order to increase the knowledge in this field, and thereby improve models used. First, a laminar flame propagation study has been conducted to address both confinement and curvature effects on the laminar flame speed in a spherical configuration. The main difficulty to perform the simulation of the whole configuration consists in finding a numerical method able to compute accurately the flow generated by one fan and able to handle six fans simultaneously too. Two numerical methodologies have been tested. First an Immersed Boundaries method was implemented. Despite good results obtained on academic test cases, this method was shown to be unadapted to compute accurately the flow generated by one fan. On the other hand, a numerical approach, coming from turbomachinery calculations and based on code coupling (called MISCOG), demonstrates its ability to do it and it is used to compute the flow generated by the six fans inside the closed vessel. Non-reacting flow is first analyzed and reveals a zone at the vessel center of around 6 cm of diameter where mean velocity is near zero and turbulence is almost homogeneous and isotropic. After that, the premixed fresh mixture is ignited depositing a hot gases kernel at the vessel center and the turbulent propagation phase is analyzed. In particular, it is shown that the amount of energy deposited at ignition is a critical parameter.

La conception des nacelles doit répondre à des contraintes géométriques d’encombrement mais aussi à des spécifications motoristes qui précisent les niveaux de performance exigés. Au sol, l’une des principales contraintes imposées par le motoriste concerne le niveau de distorsion de pression totale dans le plan fan quand la nacelle est soumise à un vent de travers. Dans le cas le plus limitant, c’est-à-dire lorsque la direction du vent est perpendiculaire à l’axe de la nacelle, il se produit un décollement au niveau de l’entrée d’air côté vent. L’hétérogénéité de l’écoulement crée des efforts instationnaires sur les aubes du fan. Ces efforts peuvent amener à un régime de pompage endommageant ainsi le moteur. De plus, la tendance actuelle est de réaliser des nacelles courtes, réduisant la distance qu’à l’écoulement pour s’homogénéiser avant d’impacter le fan, conduisant à un couplage entre le décollement et le fan. Le but de cette étude est de simuler numériquement l’écoulement intervenant dans une nacelle courte soumise à un vent de travers et d’étudier l’impact de la présence du fan. Tout d’abord, la définition de la distorsion est basée sur les grandeurs totales. Ainsi, la compréhension du comportement des grandeurs totales au voisinage d’une paroi et l’influence des paramètres numériques sur leur évolution est nécessaire. Une approche analytique et numérique sur plaque plane a permis d’évaluer le comportement des grandeurs totales à la frontière externe de la couche limite et l’influence des paramètres numériques RANS sur leur évolution. Cette étude a permis de choisir les paramètres numériques utilisés pour la simulation de la nacelle. Pour faire ressortir l’influence du fan sur la distorsion, deux types de simulations ont été menés : une simulation de nacelle isolée et une simulation de l’ensemble complet nacelle/fan respectivement comparées à un essai en soufflerie sur une maquette de nacelle isolée et à un essai de moteur complet à échelle 1 :1 réalisé en « soufflerie » à veine ouverte. La description correcte de la distorsion nécessite de prendre en compte les phénomènes de transition. Une méthode innovante de prise en compte de la transition par équations de transport est utilisée. Comme le coût de calcul de l’ensemble complet est prohibitif, la question du découplage du calcul en injectant une distorsion, issue d’une simulation de nacelle isolée, dans un calcul de fan isolé est discutée. La distorsion par vent de travers intervient lorsque l’avion est au sol. Par conséquent, l’impact de la présence du sol est étudié dans le cas de la nacelle isolée. Enfin, le critère de distorsion utilisé présente plusieurs défauts importants et peut être remis en cause. Une nouvelle méthode de mesure et de calcul estétudiée. / Inlet design must fulfill geometrical constraints and engine requirements. One of these requirementsis the homogeneity of the flow impacting the fan which is quantified by the distortionlevels of stagnation pressure. When the airplane is on the ground and ready to take-off, crosswindconditions are critical for the distorsion level. The most critical case is when the wind directionis normal to the engine axis. Subsonic and supersonic separations occur near the inlet lip. Theso-created heterogeneity produces an unsteady stress on the fan blades which can lead to surge.Furthermore, short inlets are designed nowadays reducing the distance available for the flow tohomogenize before the fan leading to a coupling between the fan and the separated flow region.The aim of this study is to numerically predict the flow in a short inlet under crosswind conditionsand to investigate the fan influence on the distortion. First of all, the distortion definition isbased on stagnation quantities. Therefore, the stagnation quantities behavior and the numericalparameters influence must be investigated. The behavior of the stagnation quantities near theboundary layer edge is studied with analytical and numerical approaches. The numerical parameterschosen for the inlet simulation come from the so-obtained results obtained. In order tohighlight the fan influence on the distortion, two kinds of simulations were proceeded and comparedto experimental results : an isolated inlet simulation and a inlet/fan simulation. To correctlypredict the distortion, transition has to be be taken into account. Therefore an innovative solutionusing transport equations is used. As the computation cost for the inlet/fan computation isprohibitive, the decoupling which consists in injecting on a isolated fan the distortion obtainedduring a isolated inlet computation, is discussed. In fact, crosswind conditions occur when theairplane is on the ground, thus, the ground influence over the inlet distortion is studied for anisolated inlet. Finally, the distortion criterion used in this study has evidenced some strong defectsand can be questioned. Another approach of measurement with another criterion definitionis investigated.

Esta pesquisa trata das maneiras pelas quais a imagem pública do artista popular gaúcho Vitor Mateus Teixeira, conhecido como Teixeirinha – que morreu em 1985, depois de uma longa carreira de sucesso no Brasil e no exterior na música e no cinema – é construída, percebida e colocada em circulação. Através de uma etnografia das manifestações de seus fãs no cemitério da Santa Casa, das correspondências dos fãs, dos discursos da imprensa escrita e televisiva sobre o artista, e dos projetos de vários agentes dedicados à gestão de sua imagem pública, especialmente aqueles conduzidos por sua família, representada pela Fundação Vítor Mateus Teixeira, eu tento mostrar como a imagem de um ídolo popular pode se tornar um objeto de disputas. Além disso, argumento que a trajetória de um “herói” do povo pode, através de um viés antropológico, ser tomada como uma espécie de lente através da qual se pode colocar em evidência muitas dimensões do imaginário e da memória coletiva da sociedade brasileira. / This research is about the ways through which the public image of gaucho popular artist Vitor Mateus Teixeira, known as Teixeirinha – who passed away in 1985, after a long successful career in Brazil and abroad in the music and cinema business – is built, acknowledged and placed into circulation nowadays. Through an ethnography of his fans’ manifestations at the Santa Casa cemetery, of fan mail, of the discourse from the press about the artist, and the projects of the various agents dedicated to the management of his current image, especially the ones conducted by his family, represented by the Vitor Mateus Teixeira Foundation, and the press from Rio Grande do Sul, I try to show how this image of a popular idol can become a disputed object. Besides that, I argument that the trajectory of a popular "hero" can, through an anthropological bias, be taken as a type of lens, which is able to place in evidence many dimensions of the imaginary and of the collective memory of the Brazilian society.

Made available in DSpace on 2014-06-11T19:25:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-11-06Bitstream added on 2014-06-13T18:26:31Z : No. of bitstreams: 1 fogal_mlf_me_bauru.pdf: 1973940 bytes, checksum: 7fa4d89826d2cfb9214807f1ec353036 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Neste trabalho apresenta-se uma análise teórica e experimental dos resultados comparativos entre as curvas características de um ventilador axial utilizado em um sistema de pulverização agrícola para um ângulo de ataque da pá em 32 graus nas rotações de 1500, 1750, 2600 e 3000 rpm e resultados numéricos da influência da variação do ângulo de ataque da pá em 28, 32 e 36 graus e da otimização do sistema de pulverização ambos para uma rotaç]ao de 2600 rpm. O campo médio turbulento foi obtido com a aplicação da média temporal sendo que o modelo de turbulência exigido para o fechamento do conjunto de equações foi o modelo k-ε de duas equações. A resolução de todos os fenômenos acoplados foi alcançada com o auxílio do código de fluidodinâmica computacional CFX que utiliza a técnica dos volumes finitos como método numérico. Para validação da análise teórica, realizaram-se experimentos em um túnel de vento horizontal de seção circular com diâmetro de 622 mm, usando um tubo de Pitot para as tomadas de pressão de acordo com a norma para ensaios em laboratório. Apresentam-se resultados qualitativos na forma de vetores e mapas de gradiente de velocidade e, quantitativos na forma de tabelas e gráficos para as curvas características. / This paper presents a theoretical and experimental analysis of comparative results the characteristic curves of an axial fan used in an agricultural spraying system for a blade attack angle of 32 degrees at rotations of 1500, 1750, 2600 and 3000 rpm and numerical results for the influence of blade attack angle variation at 28, 32 and 36 degrees and optimization of the spraying system, both for a rotation of 2600 rpm. The average turbulent field was obtained from the application of time average where the turbulence model required for closing the set of equations was the k-ε model for two equations. Resolution of all connected phenomena was achieved with the help of the fluid dynamics computacional, CFX, which uses the finite volumes technique as a numerical method. In order to validate the theoretical analysis, an experiment was conducted in a circular section of a horizontal wind tunnel, 622 mm in diameter and 6220 mm in length, using a Pitot tube for pressure readings according to the norm for laboratory assays. Qualitative results are shown as vectors and gradient maps for speed and quantitative results are shown in tables and graphics for characteristic curves.

Esta pesquisa trata das maneiras pelas quais a imagem pública do artista popular gaúcho Vitor Mateus Teixeira, conhecido como Teixeirinha – que morreu em 1985, depois de uma longa carreira de sucesso no Brasil e no exterior na música e no cinema – é construída, percebida e colocada em circulação. Através de uma etnografia das manifestações de seus fãs no cemitério da Santa Casa, das correspondências dos fãs, dos discursos da imprensa escrita e televisiva sobre o artista, e dos projetos de vários agentes dedicados à gestão de sua imagem pública, especialmente aqueles conduzidos por sua família, representada pela Fundação Vítor Mateus Teixeira, eu tento mostrar como a imagem de um ídolo popular pode se tornar um objeto de disputas. Além disso, argumento que a trajetória de um “herói” do povo pode, através de um viés antropológico, ser tomada como uma espécie de lente através da qual se pode colocar em evidência muitas dimensões do imaginário e da memória coletiva da sociedade brasileira. / This research is about the ways through which the public image of gaucho popular artist Vitor Mateus Teixeira, known as Teixeirinha – who passed away in 1985, after a long successful career in Brazil and abroad in the music and cinema business – is built, acknowledged and placed into circulation nowadays. Through an ethnography of his fans’ manifestations at the Santa Casa cemetery, of fan mail, of the discourse from the press about the artist, and the projects of the various agents dedicated to the management of his current image, especially the ones conducted by his family, represented by the Vitor Mateus Teixeira Foundation, and the press from Rio Grande do Sul, I try to show how this image of a popular idol can become a disputed object. Besides that, I argument that the trajectory of a popular "hero" can, through an anthropological bias, be taken as a type of lens, which is able to place in evidence many dimensions of the imaginary and of the collective memory of the Brazilian society.

abstract: ABSTRACT The purpose of this study is to explore how LDS (Mormon) fans of Stephenie Meyer's Twilight saga make meanings from the text in the blogging community known as the Bloggernacle. It investigates how fans recognize, reflect, reinterpret, and resist meanings surrounding multiple Big "D" Discourses (Gee, 1999/2010; 2011) in and around the text. It examines the ways in which LDS fans (Church of Jesus Christ of Latter-day Saints) of the Twilight saga use language in order to signify membership in a particular Discourse. In addition, it seeks to understand how LDS fans use language to perform various identities and position themselves and others within the digital space. This dissertation study analyzes the threads of five blogs and three discussion forums using the combined methods of critical ethnography (Carspecken, 1996) and Gee's (1999, 2010;2011) discourse analysis. It concludes, that, while multiple Discourses are present within the conversational threads, mainstream Mormon Discourse remains dominant and normalized within the space, which both informs and limits the interpretations available to Mormon fans. In addition, identity performance is negotiated in the blogs, and members form specific sub-communities within the Bloggernacle so as to create a space for those with distinct ways of believing, valuing, knowing, and identifying. / Dissertation/Thesis / Doctoral Dissertation Curriculum and Instruction 2015

Submitted by ALCIDES MARANGONI JUNIOR (amarangoni@ifma.edu.br) on 2018-05-04T22:44:01Z No. of bitstreams: 1 Dissertacao_Alcides_Marangoni_Junior_2018.pdf: 930282 bytes, checksum: 1c8e75840d460aee6513b5562a9d1de8 (MD5) / Approved for entry into archive by Alexandra Maria Donadon Lusser Segali null (alexmar@fcav.unesp.br) on 2018-05-07T11:11:47Z (GMT) No. of bitstreams: 1 marangonijunior_a_me_jabo.pdf: 930282 bytes, checksum: 1c8e75840d460aee6513b5562a9d1de8 (MD5) / Made available in DSpace on 2018-05-07T11:11:48Z (GMT). No. of bitstreams: 1 marangonijunior_a_me_jabo.pdf: 930282 bytes, checksum: 1c8e75840d460aee6513b5562a9d1de8 (MD5) Previous issue date: 2018-04-27 / Outra / O uso de pulverizadores costais manuais no Brasil é frequente em todas as propriedades rurais. Entretanto, são escassos os trabalhos de pesquisa que avaliem as suas características de trabalho, sobretudo com o modelo de ponta de pulverização que equipa os pulverizadores de fábrica e nas condições de pressão de trabalho predominantes na utilização. Desta forma, o objetivo deste trabalho foi avaliar quanto os modelos de pontas e a pressão de trabalho influenciam na qualidade da distribuição de caldas fitossanitárias com pulverizadores costais manuais. Foram avaliadas em mesa de deposição quatro modelos de pontas de pulverização (jato plano convencional - Magnojet TP 110015; jato plano defletor - Teejet TT 110015; jatos cônicos vazios - TeeJet TXA 80015 e “chapinha” original), a 1, 2, 3 e 4 bar de pressão. As análises do perfil de distribuição dos jatos foram realizadas por simetria e o coeficiente de variação analisado pelo teste de Tukey (p<0,05). Os modelos de pontas de pulverização e pressão de trabalho influenciaram em mais de 100% os valores de uniformidade de distribuição da calda, e cerca de 50% na largura da faixa útil de tratamento fitossanitário. Dentre os modelos avaliados neste trabalho, o de jato defletor é o que apresenta o melhor conjunto de características para ser indicado a equipar os pulverizadores costais manuais para os tratamentos fitossanitários a campo. / Manual backpack sprayers are widely used in rural properties in Brazil. However, studies that assess their working characteristics, especially spray tip models and working pressure conditions, are scarce. Thus, the aim of this study was to assess how much the working pressure and spray tips influence the distribution quality of phytosanitary spray solutions in manual backpack sprayers. Four spray nozzles (standard flat-fan Magnojet TP110015, turbo flat-fan TeeJet TT110015, hollow-cone TeeJet TXA80015, and disc-core) were assessed in a patternator table at 1, 2, 3, and 4 bar. Distribution profile analyses of sprays were performed by symmetry and the coefficient of variation analyzed by the Tukey’s test (p<0.05). Spray tip models and working pressure influenced in more than 100% the distribution uniformity values of spray solution and in about 50% the useful bandwidth of the phytosanitary treatment. Among the models assessed in this study, the turbo flat-fan spray nozzle presents the best set of characteristics to be indicated for manual backpack sprayers aiming at field phytosanitary treatments.