Made available in DSpace on 2014-12-17T14:54:51Z (GMT). No. of bitstreams: 1 MarciaMCC.pdf: 1219134 bytes, checksum: ac1b2a477dbba14862bddf74f1be2d43 (MD5) Previous issue date: 2008-09-05 / This work present a interval approach to deal with images with that contain uncertainties, as well, as treating these uncertainties through morphologic operations. Had been presented two intervals models. For the first, is introduced an algebraic space with three values, that was constructed based in the tri-valorada logic of Lukasiewiecz. With this algebraic structure, the theory of the interval binary images, that extends the classic binary model with the inclusion of the uncertainty information, was introduced. The same one can be applied to represent certain binary images with uncertainty in pixels, that it was originated, for example, during the process of the acquisition of the image. The lattice structure of these images, allow the definition of the morphologic operators, where the uncertainties are treated locally. The second model, extend the classic model to the images in gray levels, where the functions that represent these images are mapping in a finite set of interval values. The algebraic structure belong the complete lattices class, what also it allow the definition of the elementary operators of the mathematical morphology, dilation and erosion for this images. Thus, it is established a interval theory applied to the mathematical morphology to deal with problems of uncertainties in images / Este trabalho apresenta uma abordagem intervalar para lidar com imagens que cont?m incertezas, bem como tratar essas incertezas atrav?s de opera??es morfol?gicas. Foram apresentados dois modelos intervalares. Para o primeiro, ? introduzido um espa?o alg?brico com tr?s valores que foi constru?do com base na l?gica tri-valorada de Lukasiewiecz. Com essa estrutura alg?brica, introduz-se a teoria das imagens bin?rias intervalares, que estende o modelo cl?ssico bin?rio, com a inclus?o da informa??o de incerteza. A mesma pode ser aplicada para representar imagens bin?rias com incerteza em certos pixels, que foi originada, por exemplo, durante o processo da aquisi??o da imagem. A estrutura reticular dessas imagens permite a defini??o de operadores morfol?gicos, onde as incertezas s?o tratadas localmente. O segundo modelo, estende o modelo cl?ssico para imagens em n?veis de cinza, onde as fun??es que representam essas imagens s?o mapeadas em um conjunto finito de valores intervalares. A estrutura alg?brica desse conjunto pertence a classe dos reticulados completos, o que permite a defini??o dos operadores elementares da morfologia matem?tica, dilata??o e eros?o para essas imagens. Dessa forma, fica estabelecida uma teoria intervalar aplicada ? morfologia matem?tica para tratar problemas de incertezas em imagens

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-06-02T22:45:04Z No. of bitstreams: 1 RafaelVictorDeMeloSilva_DISSERT.pdf: 11731929 bytes, checksum: 434869a7e58a0837ddd3098a90a82d0f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-06-09T19:52:30Z (GMT) No. of bitstreams: 1 RafaelVictorDeMeloSilva_DISSERT.pdf: 11731929 bytes, checksum: 434869a7e58a0837ddd3098a90a82d0f (MD5) / Made available in DSpace on 2017-06-09T19:52:30Z (GMT). No. of bitstreams: 1 RafaelVictorDeMeloSilva_DISSERT.pdf: 11731929 bytes, checksum: 434869a7e58a0837ddd3098a90a82d0f (MD5) Previous issue date: 2017-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O homem sempre buscou instalar sua infraestrutura de ocupa??o, defesa e sobreviv?ncia pr?xima das Zonas Costeiras. A Praia de Ponta Negra, localizada ao Sul da cidade de Natal/RN, ilustra bem o processo praticado pelo homem de ocupa??o das terras por meio da explora??o de recursos naturais, muitas vezes causando altera??es na paisagem mediante o desmatamento, a pr?tica de cortes e aterros para urbaniza??o, especula??o do pre?o da terra e da instala??o de numerosas atividades econ?micas ao longo da praia. A din?mica da ocupa??o de Ponta Negra causou condi??es favor?veis ao crescente processo erosivo que gerou danos f?sicos ao cal?ad?o desta praia. Esta pesquisa tem como objetivo construir uma an?lise integrada da zona costeira da praia de Ponta Negra em Natal/RN. Nesse sentido, o presente estudo ? composto por dois artigos distintos, em que o primeiro se dedica a identificar as modifica??es morfol?gicas da praia de Ponta Negra, no per?odo de 1969 a 2016. Os valores de volume sedimentar do perfil morfol?gico utilizados foram coletados in loco no per?odo de 12 meses (2012/2013). Na identifica??o das fei??es pret?ritas foram consideradas fotografias a?reas obtidas pelo Servi?o A?reo Cruzeiro do Sul, em 1969 e imagens recentes do Google Earth Pro. No processamento das imagens empregou-se t?cnicas de processamento digital de imagens e Sistemas de Informa??es Geogr?fica (SIG). O segundo artigo busca tra?ar um perfil sobre a ocupa??o humana e eventos costeiros na praia de Ponta Negra, tomando como base as not?cias veiculadas no acervo jornal?stico da Tribuna do Norte, no per?odo de 1950 a 2016. Considera-se que o acervo de um jornal pode ser uma fonte informacional que retrata, ainda que parcialmente, um panorama dos importantes eventos ocorridos ao longo do tempo. Isto numa regi?o de uma cidade onde informa??es s?o, muitas vezes, inexistentes. Na constru??o do perfil utilizou-se a t?cnica da an?lise de conte?do, classificando em cinco grandes categorias a an?lise costeira integrada: ocupa??o humana, eventos meteorol?gicos, usos, pol?ticas p?blicas e press?es socioecon?micas. Tamb?m realizou-se a an?lise de correspond?ncia com intuito de associar os anos considerados no estudo das categorias de classifica??o. Adicionalmente, as not?cias classificadas como ?eventos meteorol?gicos? noticiados pelo Jornal foram relacionados qualitativamente ao acumulado de precipita??o conforme os registros da Esta??o Meteorol?gica do Instituto Nacional de Meteorologia, localizada na Universidade Federal do Rio Grande do Norte. O resultado do monitoramento da eros?o no perfil praial e a precipita??o mensal acumulada traz uma correla??o negativa. Quanto aos principais resultados do primeiro artigo, ressalta-se que o processo de avalia??o das fei??es costeiras resultou que em 1969 a mancha urbana representava 16,4% da ?rea de e mais de 60% em 2016. Esse dado corrobora com a hip?tese de que a destrui??o das fei??es de prote??o do ambiente potencializou o processo erosivo. As demais classes apresentaram diminui??o de ?rea, ao contr?rio da mancha urbana. Na classe vegeta??o ocorre diminui??o de 37,2% para 13,6% de cobertura vegetal e esse quadro seria respons?vel pela n?o fixa??o de sedimentos inconsolidados. Os resultados do segundo artigo demonstraram que durante todo o per?odo analisado, houve um aumento no n?mero de not?cias veiculados pelo Jornal. Esse acr?scimo de not?cias sobre a Praia de Ponta Negra ?, inicialmente, notado a partir dos anos 70, momento a partir do qual a praia em tela passa a despontar no notici?rio da m?dia impressa. Percebe-se tamb?m diferen?as nos temas das publica??es ao se compara o primeiro momento do estudo (Anos 50 e 60) e o final do estudo (Anos 2000). no primeiro momento o foco da m?dia era primordialmente quanto ao ?uso e forma de ocupa??o?. Nos anos mais recentes (Anos 2000) o foco passou a evidenciar os ?eventos meteorol?gicos?. Essa mudan?a de foco deve, possivelmente, ter rela??o com o crescimento das discuss?es em torno da mudan?as clim?ticas no mundo, que, com o passar dos anos, tem influenciado fortemente o conte?do jornal?stico. Finalmente, ainda verificou-se eventos erosivos que vieram a destruir partes extensas do cal?ad?o da praia de Ponta Negra. / Man has always sought to install his infrastructure of occupation, defense and survival near the Coastal Zones. Ponta Negra Beach, located in the south of the city of Natal, Rio Grande do Norte, illustrates well the process practiced by the man of land occupation, through the exploitation of natural resources, often causing changes in the landscape with deforestation, the practice of cuts and landfills for urbanization, speculation of the price of land and the installation of numerous economic activities along the beach. The dynamics of the occupation of Ponta Negra caused favorable conditions to the growing erosive process that generated physical damages to the boardwalk of this beach. This research aims to build an integrated analysis of the coastal zone of the beach of Ponta Negra, Natal. In this sense, the present study is composed of two distinct articles, in which the first one is dedicated to identify the morphological changes of the beach of Ponta Negra from 1969 to 2016. The values of sedimentary volume of the morphological profile used were collected locally in the period of 12 months (2012/2013). In the identification of the previous features were considered aerial photographs by the Cruzeiro do Sul Air Service in 1969. In addition, the most recent features were exported from the software Google Earth PRO. We used the technique of remote sensing, digital image processing in Geographic Information System (GIS). The second article seeks to draw a profile on human occupation and coastal events on the beach of Ponta Negra, based on the reports published in the journalistic collection of the Tribuna do Norte from 1950 to 2016. It is considered that the collection from the journal can be an informational source that portray, albeit partially, an overview of the important events that have occurred over time in a region of a city where information is often non-existent. Furthermore, to construct this profile, the content analysis technique was used to classify five categories of integrated coastal analysis: human occupation, meteorological events, uses, public policies and socioeconomic pressures. The correspondence analysis was also performed in order to associate the categories considered in the study. Additionally, the news classified as "meteorological events" reported by the Journal were qualitatively related to the rainfall accumulation observed according to the Meteorological Station records of the National Meteorological Institute located at the Federal University of Rio Grande do Norte. The result of erosion monitoring in the beach profile and the accumulated monthly rainfall has a negative correlation. As for the main results of the first article, it is pointed out that the process of evaluation of the coastal features showedthat in 1969 the urban spot represented 16.4% of the total space cut and in 2016 more than 60%. This asserts the hypothesis that the destruction of environmental protection features has potentiated the erosive process. The other classes showed a decrease of area as opposed to the urban spot. In the vegetation class, there is a decrease from 37.2% to 13.6% and this composition is responsible for the fixation of the unconsolidated sediments. The results of the second article showed that throughout the analyzed period, there was an increase in the number of news stories published by the Journal. This increase in news about Ponta Negra Beach is initially noticed from the 70s, when the beach is always included in the media considered in the study. Differences in the subject of publications are also seen when comparing the first moment of the study (Years 50 and 60) and the end of the study (Years 2000). The initial focus of the media was primarily on "use and form of occupation". In contrast, the focus of the news in the most recent years (Years 2000) have come to highlight the so-called "meteorological events". This change in the focus of the news is possibly related to the increasing importance of discussion on climate change in the world and that over the years has strongly influenced journalistic content.Finally, in addition, there have been erosive events that have destroyed vast parts of the boardwalk from the beach of Ponta Negra.

Made available in DSpace on 2015-03-13T17:10:44Z (GMT). No. of bitstreams: 1 LidianeSN_DISSERT.pdf: 4629879 bytes, checksum: d28e312771a5a0b81c006b055f5b7eb1 (MD5) Previous issue date: 2011-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The coastal zone has been studied worldwide with a focus on the coastal erosion. In the present days, much of the world's coastlines are being affected by erosion, which causes great damage to the economy. This work had as study case the beaches of Areia Preta, Artistas, Meio and Forte located in Natal in Rio Grande do Norte. It shows as result the monitoring of the beach strip that makes possible to obtain quantitative and qualitative data, allows the study of the coastal dynamics of the beaches and the Recovery Project of the Areia Preta beach interference on adjacent beaches. This research was guided by the integrated analysis method on the systemic perspective. The pratical procedures adopted were: bibliographic research; fieldwork during eleven months (environmental characterization, collection of hydrodynamic data, topographic leveling, collection of sediments) and; sedimentological analysis of samples collected. By monitoring of the points A, B, C, D and E we were able to find the occurrence of the coastal erosion on their biggest part except by the C and D profiles. It was noted the need for the government to complete the hydraulic fill, as it made only 60% of the landfill planed. It was found that the spikes built on the beach of Areia Preta are preventing the natural transport of sediments that the longshore performs towards South-North. This interference is causing the lack of sediment on the beaches of Forte and Meio and their coastal erosion in consequence / A zona costeira tem sido estudada em escala mundial com o enfoque na eros?o costeira. Atualmente, grande parte das linhas de costa mundial est? sendo afetada pela eros?o, o que gera grande preju?zo para a economia. O trabalho teve como ?rea de estudo as praias de Areia Preta, dos Artistas, do Meio e do Forte, localizadas em Natal/RN. Apresenta como resultado o monitoramento da faixa de praia, que possibilita a obten??o de dados quantitativos e qualitativos, permite o estudo da din?mica costeira das praias e da interfer?ncia do projeto de recupera??o da praia de Areia Preta nas praias adjacentes. Esta pesquisa foi norteada pelo m?todo da an?lise integrada, na perspectiva sist?mica. Os procedimentos pr?ticos adotados foram: pesquisa bibliogr?fica; trabalho de campo durante onze meses (caracteriza??o ambiental, coleta de dados hidrodin?micos, nivelamento topogr?fico e coleta de sedimentos) e; an?lise sedimentol?gica das amostras coletadas. Atrav?s do monitoramento dos pontos A, B, C, D e E, foi poss?vel constatar a ocorr?ncia de eros?o costeira em todos os perfis. Notou-se a necessidade do poder p?blico completar o aterro hidr?ulico, j? que este efetuou apenas 60% do aterro previsto. Constatou-se que os espig?es constru?dos na praia de Areia Preta est?o impedindo o transporte natural de sedimentos, que a deriva litor?nea realiza no sentido Sul-Norte. Essa interfer?ncia est? acarretando na falta de sedimentos nas praias do Meio e do Forte e, conseq?entemente, na eros?o costeira das referidas praias

Made available in DSpace on 2014-12-17T14:58:19Z (GMT). No. of bitstreams: 1 FernandoNS_DISSERT.pdf: 5044327 bytes, checksum: 66e88407297dda873c6a6d882b6de312 (MD5) Previous issue date: 2012-08-27 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / A batch of eighty-four coupons of low carbon steel were investigated at laboratory conditions under a corrosive, cavitative-corrosive (CO2) and corrosive-erosive (SiO2 + CO2) in an aqueous salt solution and two levels of temperature. The following measurements were made on Vickers (HV0,05, HV0,10, HV0,20) Microhardness tests at three levels of subsurface layer. A turbulent flow collided on the cylindrical sample, with and without mechanical stirring and gas bubbling, with and without fluid contamination by solid particles of SiO2, at two temperatures. Surface Roughness and Waviness, under two conditions "as received, after machining" and "after worn out", as well as gravimetric and electrochemical parameter were measured on the two opposite generatrices of each cylindrical sample, on the flow upstream (0?) and downstream (180?) by Profilometry, Mass Variation and Linear Polarization Resistance (LPR). The results of the Microhardness and Surface Texture of all coupons were subjected to statistical comparison, using the software Statgraphics? Centurion XVI, 95% statistical certainty, and significant differences were observed in some arrays of measurements. The corrosive wear rate measured by LPR and mass variation shown to be sensitive to the presence of bubbles and hydrodynamic fluctuations inside the cell, considering the temperature and contamination of corrosive fluid by solid particles. The main results of visual inspection relative to some topologies of the surface damages involving different mechanisms that were seen to give explanation for some fluctuations in wear rates of the steel experimentally investigated / Um lote de oitenta e quatro corpos-de-prova (CP) de a?o AISI 1018 foi investigado em laborat?rio sob solicita??es corrosivas, cavitativo-corrosivas (CO2) e erosivocorrosivas (SiO2+CO2) em meio aquoso salino e a duas temperaturas. Foram realizados ensaios de microdureza Vickers a tr?s n?veis de subsuperf?cie (HV0,05, HV0,10, HV0,20). Um fluxo agitado colidiu contra os CPs, em todas as condi??es de ensaio, sem e com agita??o mec?nica e borbulhamento de g?s, sem e com contamina??o do fluido por part?culas s?lidas de SiO2, nas duas temperaturas estudadas. A rugosidade e ondula??o superficial, nas condi??es como recebidos, ap?s usinagem e ap?s desgastados , bem como medi??es gravim?tricas e eletroqu?micas foram realizadas em duas geratrizes opostas de cada corpo-deprova, a montante (0?) e a jusante (180?), atrav?s das t?cnicas de perfilometria, varia??o m?ssica e resist?ncia de polariza??o linear (RPL). Os resultados da microdureza e da textura superficial em todos CPs foram submetidos ? compara??o estat?stica, utilizando-se o software Statgraphics? Centurion XVI e, com 95% de certeza estat?stica, diferen?as significativas foram observadas em alguns grupos de medidas. As medidas das taxas de desgaste corrosivo, por RPL e por varia??o m?ssica, demonstraram serem sens?veis ? presen?a de bolhas e ?s flutua??es hidrodin?micas no interior da c?lula, consideradas a temperatura e a contamina??o do fluido corrosivo por part?culas s?lidas. Apresentam-se, tamb?m, os principais resultados da inspe??o visual em que se evidenciam algumas topologias do dano superficial nas geratrizes a 0? e a 180?, involvendo diferentes mecanismos que foram presenciados, para justificar algumas flutua??es nas taxas de desgaste do a?o em estudo