Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-26T19:01:21Z No. of bitstreams: 1 JussierDeOliveiraVitoriano_DISSERT.pdf: 29322891 bytes, checksum: 0c0254774bc22cc8cdd1189f3829e271 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-28T21:34:07Z (GMT) No. of bitstreams: 1 JussierDeOliveiraVitoriano_DISSERT.pdf: 29322891 bytes, checksum: 0c0254774bc22cc8cdd1189f3829e271 (MD5) / Made available in DSpace on 2016-01-28T21:34:07Z (GMT). No. of bitstreams: 1 JussierDeOliveiraVitoriano_DISSERT.pdf: 29322891 bytes, checksum: 0c0254774bc22cc8cdd1189f3829e271 (MD5) Previous issue date: 2015-01-09 / O presente trabalho teve como objetivo analisar a resposta biol?gica em superf?cies de tit?nio modificadas por plasma de Ar+N2+H2. Discos de tit?nio grau II receberam diferentes tratamentos de superf?cie com plasma de Ar+N2+H2, constituindo sete grupos experimentais incluindo amostras apenas polidas utilizadas como padr?o. Antes e ap?s o tratamento as amostras foram caracterizadas quanto ? topografia, estrutura cristalina e molhabilidade, usando microscopia de for?a at?mica, difra??o de raios-X, espectroscopia Raman e ensaio da gota s?ssil, respectivamente. Plasma sangu?neo rico em plaquetas (PRP) foi aplicado sobre as superf?cies modificadas em placas de cultivo. Imagens obtidas por microscopia eletr?nica das plaquetas aderidas foram analisadas a fim de verificar o comportamento das plaquetas nas diferentes condi??es experimentais. Verificou-se que a adi??o de H2 na atmosfera do plasma resultou em superf?cies mais rugosas, com picos arredondados. Essas superf?cies, ao contr?rio daquelas tratadas com atmosfera de alta concentra??o de N2, s?o menos propensas ? agrega??o plaquet?ria e, consequentemente, ? forma??o de trombos quando aplicadas em dispositivos biom?dicos. / This study aimed to analyze the biological response of titanium surfaces modified by plasma Ar + N2 + H2. Titanium disks grade II received different surface treatments Ar + N2 + H2 plasma, constituting seven groups including only polished samples used as standard. Before and after treatment the samples were evaluated in terms of topography, crystal structure and wettability, using atomic force microscopy, X-ray diffraction, Raman spectroscopy and testing of the sessile drop, respectively. Rich plasma (PRP) was applied to the surfaces modified in culture plates. Images obtained by scanning electron microscopy of the adhered platelets were analyzed to verify the behavior of platelets in the different experimental conditions. We verified that the adition of H2 on plasma atmosphere resulted in more rough surfaces, with round tops. These surfaces, in contrast to that surfaces treated with high concentration of N2, are less propense to platelet aggregation and, consequently, to the formation of thrombus when applied in biomedical devices.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-26T19:42:20Z No. of bitstreams: 1 CamilaPacellyBrandaoDeAraujo_DISSERT.pdf: 4969845 bytes, checksum: f1f2fb0b021589a796762546c844670e (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-29T17:12:23Z (GMT) No. of bitstreams: 1 CamilaPacellyBrandaoDeAraujo_DISSERT.pdf: 4969845 bytes, checksum: f1f2fb0b021589a796762546c844670e (MD5) / Made available in DSpace on 2016-01-29T17:12:23Z (GMT). No. of bitstreams: 1 CamilaPacellyBrandaoDeAraujo_DISSERT.pdf: 4969845 bytes, checksum: f1f2fb0b021589a796762546c844670e (MD5) Previous issue date: 2015-01-30 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / As emiss?es de compostos sulfurados pela ind?stria do refino de petr?leo v?m sendo sujeitas a legisla??es cada vez mais restritivas devido aos impactos ambientais e na sa?de humana. A remo??o de compostos de enxofre pode ocorrer atrav?s de rea??es de hidrotratamento (HDT) as quais s?o catalisadas por s?lidos, geralmente ?xidos ou sulfetos met?licos normalmente suportados em alumina. Para a remo??o de enxofre (HDS) catalisadores de Co(Ni)-Mo(W)/Al2O3 s?o os mais utilizados, por?m novos materiais vem sendo desenvolvidos para esse fim. Carbetos de metais refrat?rios foram identificados como potenciais candidatos para essa aplica??o, a dopagem destes pode ser uma alternativa para a cat?lise dessa rea??o. Os precursores para obten??o de Mo2C foram heptamolibdato de molibd?nio [(NH4)6[Mo7O24].4H2O] e nitrato de cobalto [Co(NO3)2.6H2O] e foram cominu?dos manualmente em propor??es estequiom?tricas anteriormente ? rea??o. Os precursores foram caracterizados por TG/DTA, MEV, FRX e DRX. Os carbetos de molibd?nio com adi??o de cobalto foram obtidos atrav?s de rea??o g?s-s?lido com atmosfera de metano (CH4) e hidrog?nio (H2) utilizando reator de leito fixo. Foi utilizada vaz?o total da mistura gasosa de 15L/h com 5% de CH4 e taxa de aquecimento de 5?C/min at? a temperatura de rea??o (700 ou 750?C). Dois percentuais de cobalto foram empregados: 2,5 e 5%. Foi notada a presen?a de fase CoMoO4 e MoO3 nos percursores calcinados, o que indica o ?ntimo contato entre os metais. Para os produtos da rea??o de carboneta??o a 700?C, independentemente do teor de cobalto adicionado, foi formado Mo2C-ortorr?mbica e MoO2- monocl?nica. A 750?C somente Mo2C foi detectada por DRX. N?o foi poss?vel a identifica??o de fase contendo Co pelos difratogramas em nenhuma das condi??es. Nessa temperatura, a an?lise de TOC indicou a completa convers?o dos ?xidos a carbeto, com forma??o de 8,9% de carbono livre para a amostra com 2,5% de Co, para a amostra com 5% a convers?o foi incompleta (86%). Os produtos de rea??o foram caracterizados por FRX, DRX, MEV, TOC, BET e granulometria a laser / Sulfur compounds emissions have been, on the late years, subject to more severe environmental laws due to its impact on the environment (causing the acid rain phenomena) and on human health. It has also been object of much attention from the refiners worldwide due to its relationship with equipment?s life, which is decreased by corrosion, and also with products? quality, as the later may have its color, smell and stability altered by the presence of such compounds. Sulfur removal can be carried out by hydrotreating (HDT) which is a catalytic process. Catalysts for HDS are traditionally based on Co(Ni)-Mo(W)/Al2O3. However, in face of the increased contaminants? content on crude oil, and stricter legislation on emissions, the development of new, more active and efficient catalysts is pressing. Carbides of refractory material have been identified as potential materials for this use. The addition of a second metal to carbides may enhance catalytic activities by increasing the density of active sites. In the present thesis Mo2C with Co addition was produced in a fixed bed reactor via gas-solid reaction of CH4 (5%) and H2(95%) with a precursor made of a mix of ammonium heptamolybdate [(NH4)6[Mo7O24].4H2O] and cobalt nitrate[Co(NO3)2.6H2O] at stoichiometric amounts. Precursors? where analyzed by XRF, XRD, SEM and TG/DTA. Carboreduction reactions were carried out at 700 and 750?C with two cobalt compositions (2,5 and 5%). Reaction?s products were characterized by XRF, XRD, SEM, TOC, BET and laser granulometry. It was possible to obtain Mo2C with 2,5 and 5% cobalt addition as a single phase at 750?C with nanoscale crystallite sizes. At 700?C, however, both MoO2 and Mo2C phases were found by XRD. No Co containing phases were found by XRD. XRF, however, confirmed the intended Co content added. SEM images confirmed XRD data. The increase on Co content promoted a more severe agglomeration of the produced powder. The same effect was noted when the reaction temperature was increased. The powder synthesized at 750?C with 2,5% Co addition TOC analysis indicated the complete conversion from oxide material to carbide, with a 8,9% free carbon production. The powder produced at this temperature with 5% Co addition was only partially converted (86%)

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-03T20:53:53Z No. of bitstreams: 1 AlanPauloOliveiraDaSilva_TESE.pdf: 1827762 bytes, checksum: f478a28631ce88521aefb0bb1971ecff (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-04T00:09:56Z (GMT) No. of bitstreams: 1 AlanPauloOliveiraDaSilva_TESE.pdf: 1827762 bytes, checksum: f478a28631ce88521aefb0bb1971ecff (MD5) / Made available in DSpace on 2016-02-04T00:09:56Z (GMT). No. of bitstreams: 1 AlanPauloOliveiraDaSilva_TESE.pdf: 1827762 bytes, checksum: f478a28631ce88521aefb0bb1971ecff (MD5) Previous issue date: 2015-01-30 / Este trabalho prop?e a utiliza??o do modelo comportamental do ciclo de histerese do capacitor ferroel?trico como uma nova alternativa ?s t?cnicas normalmente custosas no c?lculo de fun??es n?o-lineares em neur?nios artificiais implementados em plataforma de hardware reconfigur?vel, no caso, um dispositivo FPGA. Inicialmente a proposta foi validada por meio da implementa??o da l?gica booleana atrav?s dos modelos digitais de dois neur?nios artificiais: o Perceptron e uma varia??o do modelo Spiking Neuron Integrate and Fire, ambos utilizando o modelo tamb?m digital do ciclo de histerese do capacitor ferroel?trico como unidade b?sica n?o-linear no c?lculo das sa?das dos neur?nios. Finalmente, foi utilizado um modelo anal?gico do capacitor ferroel?trico com o objetivo de verificar a sua efic?cia e uma poss?vel redu??o no n?mero de elementos l?gicos necess?- rios no caso da implementa??o dos neur?nios em circuito integrado. As implementa??es foram realizadas por meio de modelos em Simulink e a sintetiza??o dos mesmos foi feita com o aux?lio do software DSP Builder, da Altera Corporation. / This work proposes the use of the behavioral model of the hysteresis loop of the ferroelectrics capacitor as a new alternative to the usually costly techniques in the computation of nonlinear functions in artificial neurons implemented on reconfigurable hardware platform, in this case, a FPGA device. Initially the proposal has been validated by the implementation of the boolean logic through the digital models of two artificial neurons: the Perceptron and a variation of the model Integrate and Fire Spiking Neuron, both using the model also digital of the hysteresis loop of the ferroelectric capacitor as it?s basic nonlinear unit for the calculations of the neurons outputs. Finally, it has been used the analog model of the ferroelectric capacitor with the goal of verifying it?s effectiveness and possibly the reduction of the number of necessary logic elements in the case of implementing the artificial neurons on integrated circuit. The implementations has been carried out by Simulink models and the synthesizing has been done through the DSP Builder software from Altera Corporation.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-29T21:50:23Z No. of bitstreams: 1 JoseAntonioBarrosLealReisAlves_TESE.pdf: 5550413 bytes, checksum: 4c1d98761f0c020539c60eca7d324bf6 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-01T21:55:58Z (GMT) No. of bitstreams: 1 JoseAntonioBarrosLealReisAlves_TESE.pdf: 5550413 bytes, checksum: 4c1d98761f0c020539c60eca7d324bf6 (MD5) / Made available in DSpace on 2016-03-01T21:55:58Z (GMT). No. of bitstreams: 1 JoseAntonioBarrosLealReisAlves_TESE.pdf: 5550413 bytes, checksum: 4c1d98761f0c020539c60eca7d324bf6 (MD5) Previous issue date: 2014-06-09 / O aumento da demanda energ?tica est? sendo atendida em grande parte por reservas de combust?veis f?sseis, que emitem CO2, SOx e v?rios outros gases poluentes. Cresce tamb?m a busca por combust?veis que emitam menos poluentes e que possuam a mesma efici?ncia energ?tica. Neste contexto, o hidrog?nio (H2) vem sendo cada vez mais reconhecido como um potencial carreador de energia para um futuro pr?ximo. Isso ocorre porque o H2 pode ser obtido por diversas rotas e tem uma vasta ?rea de aplica??o, al?m de possuir queima limpa, gerando apenas H2O como produto da queima, e a maior densidade de energia por unidade de massa. O processo de reforma com recircula??o qu?mica (RRQ) vem sendo bastante investigado nos ?ltimos anos, pois ? poss?vel regenerar o carreador de oxig?nio por meio da aplica??o de ciclos de redu??o e oxida??o. Este trabalho tem como objetivo geral desenvolver carreadores de oxig?nio a base de n?quel e cobalto para estudar a reatividade em processo de reforma com recircula??o qu?mica. Os carreadores de oxig?nio foram preparados por tr?s m?todos diferentes: combust?o assistida por microondas, impregna??o por via ?mida e coprecipita??o. Todos os materiais sintetizados possuem a mesma quantidade em massa das fases ativas (60%m/m). Os 40%m/m restantes s?o de La2O3 (8%m/m), Al2O3 (30%m/m) e MgO (2%). Os carreadores de oxig?nio foram nomeados da seguinte forma: N ou C, n?quel ou cobalto, seguido do n?mero 3 ou 6, que significa 30 ou 60% de fase ativa na forma de ?xido e C, CI ou CP, que significa combust?o assistida por micro-ondas, combust?o assistida por micro-ondas seguida de impregna??o por via ?mida e co-precipita??o. Os carreadores de oxig?nio foram ent?o caracterizados atrav?s das t?cnicas de difra??o de raios X (DRX), ?rea espec?fica (BET), redu??o ? temperatura programada (RTP) e microscopia eletr?nica de varredura (MEV). Os resultados de caracteriza??o mostraram que os diferentes m?todos de s?ntese levaram ? obten??o de diferentes estruturas e morfologias. Os testes de redu??o/oxida??o utilizando CH4 como redutor e ar sint?tico como oxidante foram realizados com os carreadores de oxig?nio N6C e C6C, N6CI e C6CI e N6CP e C6CP. Os testes revelaram diferentes comportamentos e que estes dependem do tipo de fase ativa bem como do tipo de s?ntese. O carreador de oxig?nio N6C foi o que produziu mais H2, ao passo que o carreador de oxig?nio C6CI foi o que produziu mais CO2 e H2O, sem ocorr?ncia da forma??o de coque. / Increasing energy demand is being met largely by fossil fuel reserves, which emit CO2, SOx gases and various other pollutants. So does the search for fuels that emit fewer pollutants and have the same energy efficiency. In this context, hydrogen (H2) has been increasingly recognized as a potential carrier of energy for the near future. This is because the H2 can be obtained by different routes and has a wide application area , in addition to having clean burning, generating only H2O as a product of combustion , and higher energy density per unit mass . The Chemical Looping Reforming process (CLR) has been extensively investigated in recent years, it is possible to regenerate the catalyst by applying cycles of reduction and oxidation. This work has as main objective to develop catalysts based on nickel and cobalt to study the reactivity of reform with chemical recycling process. The catalysts were prepared by three different methods: combustion assisted by microwave, wet impregnation and co-precipitation. All catalysts synthesized have the same amount by weight of the active phases (60% w / w). The other 40 % m/m consists in La2O3 (8% w / w), Al2O3 (30% w / w) and MgO (2%). Oxygen carriers have been named as follows: N or C, nickel or cobalt, followed by the number 3 or 6, meaning 30 to 60% of active phase in the oxide form and C, CI or CP, which means self-combustion assisted by microwave, self-combustion assisted by microwave followed by wet impregnation and co-precipitation. The oxygen carriers were then characterized by the techniques of X-ray diffraction (XRD), surface area (BET), temperature programmed reduction (TPR) and scanning electron microscopy (SEM). The characterization results showed that the different synthesis methods have led to obtaining different morphologies and structures. Redox tests using CH4 as reducing agent and sintetic air as oxidant agent was done with N6C and C6C, N6CI and C6CI and N6CP and C6CP oxygen carriers. The tests revealed different behaviors, depending on active phase and on synthesis procedure. N6C oxygen carrier produced high levels of H2. The C6CI oxygen carrier produced CO2 and H2O without carbon deposits.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-09T23:16:21Z No. of bitstreams: 1 GersicaVasconcelosGoes_DISSERT.pdf: 29278662 bytes, checksum: 8879d44446303fafe0835927d79be406 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-11T20:28:31Z (GMT) No. of bitstreams: 1 GersicaVasconcelosGoes_DISSERT.pdf: 29278662 bytes, checksum: 8879d44446303fafe0835927d79be406 (MD5) / Made available in DSpace on 2016-03-11T20:28:31Z (GMT). No. of bitstreams: 1 GersicaVasconcelosGoes_DISSERT.pdf: 29278662 bytes, checksum: 8879d44446303fafe0835927d79be406 (MD5) Previous issue date: 2015-04-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / A incurs?o sobre a ?rea hist?rica do central de Fortaleza apresenta reminisc?ncias de um acervo patrimonial pass?vel de reconhecimento como patrim?nio edificado da cidade, tanto em aspectos arquitet?nicos quanto urban?sticos. O bairro tem em seu tecido urbano uma s?ntese das diversas fases da arquitetura brasileira materializada em seu tra?ado e nos bens edificados. Essa composi??o abrange principalmente a produ??o ecl?tica, perpassando pelo momento do art d?co e inclui o per?odo da produ??o moderna. O presente trabalho visa identificar no acervo patrimonial existente, as temporalidades e espacialidades que possibilitam remontar a hist?ria da forma urbana do bairro. Utilizando-se do aporte te?ricometodol?gico da morfologia urbana de autores como Aldo Rossi (1966), Gordon Cullen (1971), Jos? Lamas (1990), Kevin Lynch (1960), e Philippe Panerai (1999) foi permitido, em um percurso predefinido, tecer parte da mem?ria urbana fortalezense. O estudo hist?ricomorfol?gico percorre atrav?s da an?lise sequenciada os subconjuntos articulados formados pela rede de pra?as do bairro: Pra?a Jos? de Alencar, Pra?a Capistrano de Abreu (Lagoinha), Pra?a Cl?vis Bevil?quia, Pra?a do Carmo, Pra?a Murilo Borges (BNB), Pra?a Cora??o de Jesus, Parque das Crian?as, Pra?a do Riacho Paje?, Pra?a dos Volunt?rios (Pol?cia), Pra?a do Ferreira, Pra?a Waldemar Falc?o (Correios), Pra?a General Tib?rcio (Le?es), Pra?a Figueira de Melo, Bosque Dom Delgado (Paje?), Pra?a Cristo Redentor, Pra?a Caio Prado (S?), Pra?a dos M?rtires (Passeio P?blico), e Pra?a Castro Carreira (Esta??o). Setorizou-se o bairro com base nesse sistema de pra?as, pois se percebe que h? nesses espa?os p?blicos um trajeto que contempla uma parcela da hist?ria urbana fortalezense. Al?m de que em seu entorno, h? uma maior concentra??o de bens patrimoniais em rela??o aos demais setores do bairro em que a descaracteriza??o ? uma imperativa do conjunto urbano. Visando apreender essa rede de espa?os p?blicos contidas na ?rea estudada foram propostos dois percursos baseados nos limites da cidade de 1875 delineados por Adolfo Herbster (Planta da cidade da Fortaleza). O trajeto se inicia pelas conhecidas boulevards (avenidas do Imperador, Duque de Caxias e Dom Manuel) e pela orla mar?tima. O estudo ? pautado na an?lise bibliogr?fica, documental e emp?rica, sendo composto por uma sobreposi??o de mapas, acervo fotogr?fico e desenhos que ratificam esse acervo patrimonial tanto arquitet?nico quanto urban?stico na contemporaneidade. Dentre os resultados obtidos, observou-se que diante de um quadro atual da perda do locus da no??o de aglomerado hist?rico-cultural, as pra?as expressam os redutos da ambi?ncia patrimonial que por ventura resistem na morfologia urbana da Capital cearense. / The incursion into the historical area from Fortaleza?s downtown presents reminiscences of a heritage collection that can be recognized as city built heritage, in architectural and urban aspects. The neighborhood has in its urban tracing a synthesis of the various phases from the Brazilian architecture materialized in its tracing and built goods. This composition mainly covers the eclectic production, passing the time of art d?co, including the period of modern production. This paper aims to identify the existing heritage collection. This study aims to identify the existing net assets, the temporality and spatiality that allow to recreate the neighborhood?s form urbain history. Based on the theoretical and methodological support of the urban morphology urban of authors such as Aldo Rossi (1966), Gordon Cullen (1971), Jos? Lamas (1990), Kevin Lynch (1960), and Philippe Panerai (1999) was allowed on a predefined route, to build part of urban memory of Fortaleza. The historical and morphological study runs through a sequenced analysis developed on the articulated subsets, formed by the network neighborhood squares: Pra?a Jos? de Alencar, Pra?a Capistrano de Abreu (Lagoinha), Pra?a Cl?vis Bevil?quia, Pra?a do Carmo, Pra?a Murilo Borges (BNB), Pra?a Cora??o de Jesus, Parque das Crian?as, Pra?a do Riacho Paje?, Pra?a dos Volunt?rios (Pol?cia), Pra?a do Ferreira, Pra?a Waldemar Falc?o (Correios), Pra?a General Tib?rcio (Le?es), Pra?a Figueira de Melo, Bosque Dom Delgado (Paje?), Pra?a Cristo Redentor, Pra?a Caio Prado (S?), Pra?a dos M?rtires (Passeio P?blico), e Pra?a Castro Carreira (Esta??o). Separated the neighborhood based on this square system because it is perceived that there is in these public spaces a path which includes a portion of the urban history of Fortaleza. In addition to this there is a higher concentration of goods in its area in relation to others sectors of the neighborhood, where the loss of the characterization is an imperative of the urban set. In order to find this network of public spaces contained in the study area were proposed two routes based on the city limits of 1875 established by Adolfo Herbster (Fortaleza?s city plan).The path starts by known boulevards (Imperador, Duque de Caxias and Dom Manuel avenues) and the seafront. The study is grounded in the literature review, document and empirical theme, consisting of an overlay of maps, drawings and photographic collection that ratify this net assets as both architectural urban nowadays. Among the results, it was observed that before a current context of loss of locus of the concept of historical-cultural agglomerated, the squares express the strongholds of equity ambience that perhaps stand in urban morphology of the capital from Cear?.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-10T00:20:49Z No. of bitstreams: 1 AngelaMariaBezerra_DISSERT.pdf: 6461619 bytes, checksum: 343f1af7920071b236c0c8a7d9f827a3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-16T22:36:28Z (GMT) No. of bitstreams: 1 AngelaMariaBezerra_DISSERT.pdf: 6461619 bytes, checksum: 343f1af7920071b236c0c8a7d9f827a3 (MD5) / Made available in DSpace on 2016-03-16T22:36:28Z (GMT). No. of bitstreams: 1 AngelaMariaBezerra_DISSERT.pdf: 6461619 bytes, checksum: 343f1af7920071b236c0c8a7d9f827a3 (MD5) Previous issue date: 2014-06-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / A Mina Breju?, situada no munic?pio de Currais Novos (RN), foi respons?vel pelo crescimento da economia local entre os anos de 1943 de 1990, atraindo uma m?o de obra de mineradores para o n?cleo urbano. Ap?s o fim da extra??o da scheelita, a mina foi transformada em um ?Parque Tem?tico?, em 2004. A empresa imprimiu sua marca na cidade com a constru??o de monumentos que fazem referencia ? atividade mineira e ao seu fundador Tomaz Salustino. No entanto, n?o existem registros escritos sobre os primeiros garimpeiros nem sobre o sistema de explora??o do min?rio em seu in?cio. Conv?m ent?o coletar as mem?rias dos mineradores e perguntar se, ao longo das mais de cinco d?cadas em que durou o auge da minera??o, se construiu uma identidade ligada ? profiss?o; em que medida os trabalhadores fazem referencia a esta hist?ria como integrantes e quais s?o os s?mbolos que est?o sendo acionados na elabora??o de uma identidade oper?ria. Investigo ainda que mem?ria se constituiu em torno dos pioneiros, em sua maioria agricultores atra?dos pelo chamado da bateia. Para isso, recorro aos recursos audiovisuais de arquivo e aos registros orais dos interlocutores que foram filmados para a elabora??o do document?rio ?Lembran?as de velhos garimpeiros?. Notamos que, no script da hist?ria oficial da Mina Breju?, a figura do ?patr?o? se sobrep?e ? dos trabalhadores e que as formas de patronagem, oriundas do mundo rural, seguiram pontuando as rela??es sociais na mina. Hoje, com a retomada da atividade, ? poss?vel que renas?a o desejo de fortalecimento da classe oper?ria e da identidade mineira no sert?o do Serid?. / The Breju? Mine, situated in the municipality of Currais Novos (RN), was responsible for the local economy growth between the years of 1943 and 1990, causing the interest of miner's working class to its urban center. After the end of scheelita extraction, the mine became a "theme park", in 2004. The company left its mark on the city by building several monuments in reference to the mining activity and the company's founder, Tomaz Salustino. However, there are no written records that describe such activities on its early years, nor their pioneers in the mining subject. Therefore, it is important to investigate the miner?s memories and ask if, along the more than five decades that lasted the heyday of mining, an identity linked to the profession was built; the extent to which workers make reference to this history as membersand what are the symbols that are being triggered in the development of a working class identity. Further, I investigate what memory was mad concerning the pioneers, mostly farmers attracted by miner work. To do so, I make use of audiovisual archival resources and oral records of the interlocutors that were filmed in the preparations of the documentary ?Lembran?as de velhos garimpeiros". We have noticed that, in the script of the official history of the Breju? Mine, the "boss" figure overlaps the workers and that the forms patronage, originated from the rural world, followed punctuating the social relations in the mine. Today, with the resumption of the mining activity, it is possible that the strengthening of the working class and the Serid? miner identity desire reborn.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-08T22:38:21Z No. of bitstreams: 1 RobsonGuimaraesSanabio_TESE.pdf: 5116561 bytes, checksum: 312e2468286ab5c95fe5eb204d4a9168 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-11T21:47:26Z (GMT) No. of bitstreams: 1 RobsonGuimaraesSanabio_TESE.pdf: 5116561 bytes, checksum: 312e2468286ab5c95fe5eb204d4a9168 (MD5) / Made available in DSpace on 2016-04-11T21:47:26Z (GMT). No. of bitstreams: 1 RobsonGuimaraesSanabio_TESE.pdf: 5116561 bytes, checksum: 312e2468286ab5c95fe5eb204d4a9168 (MD5) Previous issue date: 2015-05-22 / A adi??o de hidrog?nio gasoso como fonte alternativa de combust?vel vem sendo largamente utilizada. Hoje em dia, v?rias experi?ncias est?o em andamento para a utiliza??o de geradores de hidrog?nio (eletrolisadores) por demanda em ve?culos automotores. Em todos os an?ncios desses produtos seus fabricantes afirmam que este procedimento fornece uma redu??o de consumo de combust?vel, reduz os n?veis de emiss?o de gases t?xicos pela descarga e melhora a vida ?til do motor. A presente pesquisa faz uma an?lise da estrutura f?sica de pe?as de motores que utilizam eletrolisadores por demanda. Para isto, foi montado um sistema estacion?rio com um motogerador de energia el?trica, monocil?ndrico, e adaptados dois eletrolisadores um de c?lula seca e outro de c?lula molhada. Nas etapas de observa??o, foram feitas an?lises de consumo em quatro faixas de carga de trabalhos e observado o pist?o do motor, que foi cortado e analisado por microscopia ?tica (MO), Microscopia Eletr?nica de Varredura e de Energia Dispersiva (MEV-EDS), Microscopia Confocal e Difra??o de Raios - X (DRX), no sistema estacion?rio, em cada etapa. Os resultados mostraram uma redu??o consider?vel no consumo de combust?vel e uma corros?o acentuada no pist?o original de f?brica, feito de liga alum?nio-sil?cio. Como barreira ? corros?o foi feita uma nitreta??o por plasma na cabe?a do pist?o, que se mostrou resistente ao ataque pelo hidrog?nio, embora tenha apresentado evid?ncias de tamb?m ter sido atacada. Concluiu-se que os eletrolisadores automotivos podem ser uma boa op??o em termos de consumo e redu??o de emiss?es de gases t?xicos, por?m o material das c?maras de combust?o dos ve?culos devem ser preparados para este fim. / The addition of hydrogen gas as an alternative fuel source has been widely used, as well reported in scientific literature. Today, several experiments are underway for the use of hydrogen generators (electrolysers) demand for motor vehicles. In all these products their ads manufacturers claim that this provides a reduction of fuel consumption, reduces the emission levels of toxic gas by the discharge and improves engine life. This research analyzes the physical structure of engine components using electrolysis on demand. To this end, a stationary system was fitted with a power generator of electricity, drum roller and adapted two electrolyzers: a dry cell and wet cell other. In steps observation were consumption analyzes in four work load ranges and observing the piston engine, which has been cut and analyzed by Optical Microscopy (OM), Scanning Electron Microscopy and Dispersive Energy (SEM-EDS), X ? Ray Diffraction (XRD) and Confocal Microscopy, the stationary system in each step. The results showed a considerable reduction in fuel consumption and a high corrosion in the original factory piston constituted of aluminum-silicon alloy. As corrosion barrier was made a plasma nitriding in the piston head, which proved resistant to attack by hydrogen, although it has presented evidence also, of having been attacked. It is concluded that the automotive electrolysers can be a good choice in terms of consumption and reducing toxic gas emissions, but the material of the combustion chambers of vehicles must be prepared for this purpose.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-07T00:01:05Z No. of bitstreams: 1 PedroHenriqueSalesDaCosta_DISSERT.pdf: 3167327 bytes, checksum: e3758236165e8d3906f6f8f92e8a236b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-05-09T20:11:14Z (GMT) No. of bitstreams: 1 PedroHenriqueSalesDaCosta_DISSERT.pdf: 3167327 bytes, checksum: e3758236165e8d3906f6f8f92e8a236b (MD5) / Made available in DSpace on 2016-05-09T20:11:14Z (GMT). No. of bitstreams: 1 PedroHenriqueSalesDaCosta_DISSERT.pdf: 3167327 bytes, checksum: e3758236165e8d3906f6f8f92e8a236b (MD5) Previous issue date: 2015-08-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Em muitos casos o passe de raiz ? uma etapa cr?tica da soldagem, uma vez que sua execu??o ? afetada por diversos fatores, tais como varia??o da abertura da junta, ?ngulo do chanfro, dimens?es da face (nariz) da raiz, inclina??o da tocha, velocidade de soldagem e velocidade de alimenta??o. Al?m disso, a escolha do processo de soldagem ? um fator primordial para garantir a execu??o de um passe de raiz com adequadas propriedades mec?nicas e metal?rgicas. Nesse contexto, este trabalho teve como objetivo estudar a viabilidade dos processos de soldagem MIG-P CC+ e TIG-A aplicado ao passe de raiz em chapas de 200 x 200 x 12,75 mm da liga de alum?nio AA 5052. Para tal, foram analisadas configura??es diferentes de soldagem: o tipo de chanfro (em V e em gola com L=2,00 e 3,00 mm) e dois tipos de metais de adi??o (ER 4043 e 5356). Como metodologia de compara??o, foi determinada a mesma corrente de 150 A e taxa de deposi??o do metal de adi??o Va/Vs = 14, foram realizadas 8 combina??es de par?metros, cada uma com 3 repeti??es, totalizando 24 testes, salientando que foi usada apenas a configura??o de chanfro mais adequada para o TIG-A. S?o apresentados resultados da micrografia e microdureza das zonas fundida e termicamente afetada e n?veis de dilui??o para as juntas soldadas com os distintos metais de adi??o, al?m da radiografia. Nas condi??es estabelecidas neste trabalho, pode-se afirmar que o processo TIG-A apresentou melhores resultados em rela??o ao MIG-P CC+. Em rela??o ? configura??o do chanfro, o que se mostrou mais adequado foi o chanfro em V, para ambos os metais de adi??o e processos. N?o ocorreram defeitos como falta de fus?o, mordeduras e rugosidades. Em rela??o aos n?veis de dilui??o, foram constatados maiores valores quando utilizado o processo MIG-P CC+ para o ER 4043, assim como o processo TIG-A na configura??o de chanfro em V. O metal de adi??o ER 4043 apresentou uma quantidade de poros maior em rela??o ao ER 5356, em ambos os processos. Foi observada ? presen?a de um refino de gr?o, al?m de maiores n?veis de dureza em todas as soldas realizadas com o metal de adi??o ER 5356. / In many cases the root pass is a critical step of welding, since its execution is affected by several factors, such as variation of joint opening, chamfer angle, dimensions of the face (nose) root, torch inclination, welding speed and feed speed. Moreover, the choice of the welding process is a key factor to ensure the execution of a root pass with adequate mechanical and metallurgical properties. In this context, this work aimed to study the feasibility of MIG-P CC+ and TIG-A welding processes applied to the root pass in plates of 200 x 200 x 12,75 mm of the AA 5052 aluminum alloy. For this, different configurations of welding were analyzed: chamfer type(V and collar with L=1,0 and 3,00 mm) and two types of addition metals (ER 4043 and 5356). As compared methodology, It was determined the same current 150 A and the deposition rate of addition metal Va/Vs = 14, they were proposed 12combinations of parameters, each with 3repetitions, totaling 36 tests, stressing that It was used only the most appropriate chamfer setting for TIG-A. Results of micrograph and microhardness of fusion and heat affected zones and dilution levels for welded joints with diferente addition metals, beyond radiography. At the established conditions in this work, it can be said that the TIG-A process showed better results in relation to MIG-P CC+. About the chamfer configuration, which was more appropriate was V chamfer, for both addition metals and process. There were no defects such as lack of fusion, bites and roughness. Relative to dilution levels, higher values were observed when used the MIG-P CC+ process for the ER 4043, as well as TIG-A in the V chamfer configuration. ER 4043 addition metal showed a larger amount of pores in relation to the ER 5356, in both process. It was observed the presence of a grain refining, beyond higher hardness levels in all welds made with the ER 5356 addition metal.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-10T23:09:22Z No. of bitstreams: 1 ElayneGouveiaDaSilva_DISSERT.pdf: 5834888 bytes, checksum: fc060e22cc4c6184b70bce45b8d19c31 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-05-17T23:17:47Z (GMT) No. of bitstreams: 1 ElayneGouveiaDaSilva_DISSERT.pdf: 5834888 bytes, checksum: fc060e22cc4c6184b70bce45b8d19c31 (MD5) / Made available in DSpace on 2016-05-17T23:17:47Z (GMT). No. of bitstreams: 1 ElayneGouveiaDaSilva_DISSERT.pdf: 5834888 bytes, checksum: fc060e22cc4c6184b70bce45b8d19c31 (MD5) Previous issue date: 2015-05-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / ? por meio de uma vis?o hol?stica dos componentes ambientais que se alcan?a o meio mais eficaz para que se ocorra um planejamento h?bil do turismo o que proporcionar? o m?nimo de impacto poss?vel ao ambiente. Considerando o fato de que a geodiversidade ? bastante visada pelo turismo, o geoturismo evidencia os aspectos do meio f?sico, muitas vezes negligenciados em detrimento a biodiversidade, e promove a divulga??o da informa??o do contexto geol?gico em uma linguagem acess?vel para o p?blico leigo ao interpretar o patrim?nio geol?gico que se revela atrativo tur?stico potencial e incita a conserva??o desses locais. Diante da potencialidade do geopatrim?nio que o munic?pio de Gurj?o/PB apresenta, ? necess?rio que se estabele?am medidas de planejamento para utiliza??o sustent?vel desses bens. Nessa perspectiva, o presente estudo tem como objetivo geral analisar os elementos da geodiversidade e seu papel com a viabilidade do turismo no munic?pio de Gurj?o/PB. Como objetivos espec?ficos: descrever os atrativos tur?sticos associados aos elementos da geodiversidade; apresentar a valora??o qualitativa e quantitativa dos geoss?tios; e identificar a percep??o da popula??o local (professores e moradores) quanto aos aspectos relacionados ao geoturismo, ?s poss?veis utiliza??es dos geoss?tios e os poss?veis efeitos socioecon?micos da atividade geotur?stica no munic?pio. Os procedimentos metodol?gicos tratados envolvem levantamento de dados em campo, aplica??o de formul?rios no invent?rio, elabora??o de planilhas e aplica??o de question?rios. Para a inventaria??o tur?stica, foram adotados formul?rios do ?Invent?rio da Oferta Tur?stica? (2011) do Minist?rio do Turismo. Os geoss?tios foram valorados qualitativamente atrav?s dos crit?rios propostos por Gray (2004). O m?todo desenvolvido por Pereira (2010) foi utilizado a fim de obter o valor em termos quantitativos dos geoss?tios com foco exclusivo nos valores tur?stico e de uso/gest?o. Para identificar a percep??o da popula??o local quanto aos poss?veis efeitos socioecon?micos do geoturismo foram realizadas duas abordagens para dois grupos; de professores e de moradores. A t?cnica utilizada para atingir o ?ltimo objetivo espec?fico do estudo foi a de entrevista com abordagem direta com a aplica??o de question?rios previamente elaborados. O invent?rio, valora??o e quantifica??o dos atrativos naturais evidenciaram que o geoturismo pode ser potencialmente desenvolvido em Gurj?o/PB, embora se tenha identificado v?rias lacunas em rela??o ? infraestrutura dos locais e a falta de interesse/conhecimento p?blico na prote??o e valoriza??o desses locais. Constata-se que a percep??o da popula??o local em rela??o aos poss?veis efeitos socioecon?micos do geoturismo no munic?pio de Gurj?o ? predominantemente positiva conjeturando os benef?cios que a atividade possa gerar, estando associado principalmente ? gera??o de novos empregos, aumento no n?mero de vagas, melhoria na infraestrutura da cidade, da qualidade de vida e da valoriza??o do patrim?nio local natural. Dessa forma, espera-se que a pesquisa contribua para ?o despertar? de moradores, gestores p?blicos e institui??es conscientes do valor da geodiversidade local e dos benef?cios que o geoturismo pode trazer. / It is through a holistic view of the environmental components that it can be achieved the most effective way so it can occur a skillful planning of tourism which will provide the minimum possible impact on the environment. Considering the fact that geodiversity is quite targeted by tourism, geotourism highlights aspects of the physical environment, often neglected to the detriment of biodiversity, and promotes the disclosure of the information of the geological context in an accessible language to the lay public in interpreting geological patrimony that reveals itself as a potential touristic attraction and encourages the conservation of these sites. Given the geopatrimony capability that the municipality of Gurj?o / PB shows, it is necessary to establish planning measures for sustainable use of the property. In that perspective, this study has as its general objective to analyze the elements of geodiversity and its role in the viability of tourism in the municipality of Gurj?o / PB. As specific objectives: describe the touristic attractions associated to the geodiversity elements; present the qualitative and quantitative valuation of geosites; and identify the perception of the local population (teachers and residents) regarding the aspects related to geotourism, the ppossible uses of the geosites and the possible socio-economic effects of the geoturistic activity in the municipality. The methodological procedures that were used involve data collection in the field, application of forms in the inventory, preparation of spreadsheets and application of questionnaires. For the touristic inventorying, forms were adopted from the "Inventory of Touristic Offer" (2011) of the Tourism Ministry. The geosites were valued qualitatively using the criteria proposed by Gray (2004). The method developed by Pereira (2010) was used to obtain the value in quantitative terms of the geosites with exclusive focus on the touristic and use/management values. To identify the perception of the local population about the possible socio-economic effects of geotourism it was performed two approaches to two groups; teachers and residents. The technique utilized to achieve the last specific objective was the interview with a direct approach with the application of previously elaborated questionnaires. The inventory, valuation and quantification of the natural attractions evidenced that the geotourism can be potentially developed in Gurj?o / PB, although it has been identified several gaps regarding the infrastructure of the locations and the lack of public interest /knowledge in the protection and appreciation of such sites. It is verified that the perception of the local population about the possible socio-economic effects of geotourism in the municipality of Gurj?o is predominantly positive conjecturing the benefits that the activity can generate, being primarily associated to the generation of new jobs, increase in the number of vacancies, improvement of the city infrastructure, quality of life and appreciation of the natural local heritage. Therefore, it is expected that the research contribute to "the awakening" of residents, public managers and institutions aware of the value of the local geodiversity and the benefits that the geoturism can bring.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-11T20:02:58Z No. of bitstreams: 1 LeonardoNunesMaiaPimentel_DISSERT.pdf: 1254095 bytes, checksum: a9efb1c54d07df68ac2b799a5135cc7e (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-05-19T00:29:08Z (GMT) No. of bitstreams: 1 LeonardoNunesMaiaPimentel_DISSERT.pdf: 1254095 bytes, checksum: a9efb1c54d07df68ac2b799a5135cc7e (MD5) / Made available in DSpace on 2016-05-19T00:29:08Z (GMT). No. of bitstreams: 1 LeonardoNunesMaiaPimentel_DISSERT.pdf: 1254095 bytes, checksum: a9efb1c54d07df68ac2b799a5135cc7e (MD5) Previous issue date: 2015-07-27 / O objetivo desse estudo foi avaliar a influ?ncia de agentes remineralizantessobre a susceptibilidade do esmalte clareado ? pigmenta??o por caf? durante o clareamento de consult?rio. Noventa incisivos bovinos foram selecionados e divididos aleatoriamente em 5 grupos (n=10) em fun??o dos agentes remineralizantes: G1 sem pigmenta??o e sem agente remineralizante; G2, fl?or neutro; G3, Nano-P, G4, CPP-ACP e; G5 sem remineralizante. A solu??o pigmentante foi confeccionada com caf? sol?vel (Nescaf?) de acordo com as orienta??es do fabricante. As amostras foram imersas no caf?, em temperatura de 55?C, por 1 minuto/4x ao dia. Todos os grupos foram clareados com Per?xido de Hidrog?nio a 35%. As medidas de cor foram realizadas pelo espectrofot?metro Easyshade (VITA), pelo m?todo CIE Lab, antes e depois das 3 sess?es de clareamento. Os dados foram submetidos ? An?lise de Vari?ncia ANOVA a dois crit?rios para medidas pareadas e ao p?s-teste de Tukey para m?ltiplas compara??es (p<0,05). Os resultados mostraram haver diferen?as estatisticamente significantes entre as subst?ncias remineralizantes para os par?metros *L, *a, *b e ?E (p<0,0001). Os valores de L*, para o grupo G5, e os de *b, para os grupos G2 e G5, diferiram do grupo controle. Ap?s a 3? sess?o de clareamento, os grupos do Fluor (G2) e aquele sem agente remineralizante (G5) apresentaram valores de ?E inferiores ao grupo controle, n?o pigmentado. Concluiu-se que a apenas os agentes remineralizantes CPP-ACP e Nano-P foram capazes de reduzir a interfer?ncia do caf? na efic?cia clareadora do per?xido de hidrog?nio. / The aim of this study was to evaluate the influence of remineralizing agents on the susceptibility of enamel cleared by the coffee pigmentation during office bleaching. Fifty bovine incisors were selected and randomly assigned into 5 groups (n = 10) on the basis of remineralizing agents: G1 gel hydrogen peroxide to 35% (control group); G2, hydrogen peroxide gel and a 35% gel 2% neutral fluorine; G3, hydrogen peroxide gel and a 35% nanostructured calcium phosphate gel, G4, hydrogen peroxide gel and a 35% casein fosfopt?dia-phosphate and amorphous calcium folder; G5 hydrogen peroxide gel to 35% without mineralizing agent. All groups exception G1 (control group) were subjected to pigmentation soluble coffee according to the manufacturer's guidelines. The samples were immersed in coffee at temperature of 55? C, 1 time a day for 4 minutes. Color changes were performed by Easyshade spectrophotometer at CIE Lab method before and after 3 whitening sessions. Data were analyzed by analysis of variance ANOVA. The results showed statistically significant differences between the remineralizing substances for the parameters L *, a *, b * ?E (p <0.0001). The L * values for the group G5, and the b * for G2 and G5 groups differed from the control group. After the 3rd whitening session, Fluor's group (G2) and that without mineralizing agent (G5) showed ?E values less than the control group that did not undergo pigmentation. It was concluded that only the nanoclusters remineralizing agents Phosphopeptides Casein-Amorphous Calcium Phosphate and Calcium Amorphous phosphate were able to reduce the coffee interference whitening efficacy of hydrogen peroxide.