Submitted by Helmut Patrocinio (hell.kenn@gmail.com) on 2017-12-01T23:43:39Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Heloisa_Onias_Dissertacao_2012.pdf: 9805428 bytes, checksum: 00e0f3bac6584320107351966c70da69 (MD5) / Approved for entry into archive by Ismael Pereira (ismael@neuro.ufrn.br) on 2017-12-04T12:33:01Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Heloisa_Onias_Dissertacao_2012.pdf: 9805428 bytes, checksum: 00e0f3bac6584320107351966c70da69 (MD5) / Made available in DSpace on 2017-12-04T12:33:37Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Heloisa_Onias_Dissertacao_2012.pdf: 9805428 bytes, checksum: 00e0f3bac6584320107351966c70da69 (MD5) Previous issue date: 2012-08 / O circuito RLD, formado por um resistor, um indutor e um diodo em s?rie, apresenta uma din?mica muito rica quando for?ado por uma tens?o externa harm?nica e vem sendo estudado h? d?cadas. Contudo, ainda existem t?picos em din?mica n?o-linear sendo estudados com variantes deste circuito. Varreduras nos par?metros de controle podem fazer com que esse sistema oscile eletronicamente entre regi?es peri?dicas e regi?es ca?ticas. O diodo ? o elemento n?o linear respons?vel pelo surgimento do caos. Utilizando um modelo de capacit?ncia n?o linear para descrever o comportamento do diodo, podemos escrever as equa??es para esse sistema e estudar a sua din?mica numericamente. Nosso principal objetivo foi o estudo de expoentes cr?ticos complexos em bifurca??es din?micas. Para isso, realizamos um estudo num?rico do circuito RLD for?ado senoidalmente utilizando como par?metros de controle a frequ?ncia e a amplitude da tens?o de entrada. Constru?mos, a partir das s?ries temporais da corrente total e da tens?o no diodo, diagramas de bifurca??o com diferentes cortes estrobosc?picos, que apresentam cascata de dobramento de per?odo, janelas peri?dicas e transi??o intermitente. Tamb?m realizamos estudos num?ricos do comportamento da m?dia na regi?o de transi??o caos-peri?dico na busca de encontrar um expoente cr?tico caracter?stico e oscilas??es na m?dia, elementos que j? foram observados no mapa log?stico. N?o foram poss?veis observar numericamente as oscila??es, mas observamos um decaimento exponencial com expoente cr?tico de aproximadamente 0,5. Montamos um sistema de controle, aquisi??o e tratamento de dados experimentais no qual ? poss?vel a realiza??o remota de experimentos simult?neos com dois circuitos diferentes. Obtivemos diagramas de bifurca??es experimentais nos quais observamos que o sistema apresentahisterese e alta sensibilidade ?s condi??es do experimento como, por exemplo, o passo de varredura do par?metro de controle. / The RLD circuit, formed by a resistor, an inductor and a diode in series, displays a very rich dynamics when forced by an external harmonic voltage, and it has being studied for decades. However, there are some topics in nonlinear dynamics that are still studied with variants of this circuit nowadays. Changes in the control parameters may cause electronic oscillations between regular and chaotic regions.The diode is the nonlinear element responsible for the appearance of chaos. Using a nonlinear capacitance model to describe the behavior of the diode, we can write the equations for this system and study its dynamics numerically. Our main objective was the study of critical exponents in complex dynamic bifurcations. For that, we did a numerical study of the RLD circuit forced sinusoidally using as control parameters the amplitude of the input voltage and the frequency. We made, from the time series obtained, bifurcation diagrams with different stroboscopic cuts, which have cascade of period-doubling, periodic windows and intermittent transition. We also did numerical studies of the average behavior in the periodic-chaos transition region searching for characteristic critical exponent and oscilas??es on average, elements that have been observed in the logistic map. It was not possible to observe the oscillations numerically, but we observed an exponential decay with critical exponent of approximately 0.5. We set up a system able to control, acquire and process experimental data making it possible to perform remote simultaneous experiments with two different circuits. We have obtained experimental diagrams bifurcations in which we observe that the system has hysteresis and high sensitivity to the conditions of the experiment such as the step of scanning the control parameter.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-01-23T13:48:58Z No. of bitstreams: 1 AlessandraAgnaAraujoDosSantos_TESE.pdf: 10998370 bytes, checksum: 203c8ccdd2621cf59c7c9d2ff97b9c73 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-01-24T13:58:55Z (GMT) No. of bitstreams: 1 AlessandraAgnaAraujoDosSantos_TESE.pdf: 10998370 bytes, checksum: 203c8ccdd2621cf59c7c9d2ff97b9c73 (MD5) / Made available in DSpace on 2018-01-24T13:58:56Z (GMT). No. of bitstreams: 1 AlessandraAgnaAraujoDosSantos_TESE.pdf: 10998370 bytes, checksum: 203c8ccdd2621cf59c7c9d2ff97b9c73 (MD5) Previous issue date: 2017-10-11 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Metal duro do tipo WC-Co ? utilizado na usinagem, perfura??o e ou fabrica??o de ferramentas de corte. Atualmente, 70% das ferramentas de corte s?o carbetos do tipo WCligante. Em n?meros de produ??o, aproximadamente 40,000 MT de ferramentas ? base de WC foram produzidas mundialmente desde 2011. Hoje, mais de 90% da produ??o de todo o metal duro, do tipo WC-ligante, utiliza o cobalto como ligante principal. A superioridade do cobalto em rela??o a outros ligantes est? ligada a v?rios fatores, sendo o principal a largura da janela de carbono no diagrama de fase. As pesquisas por ligantes alternativos que possam vir a substituir ao menos de forma parcial o cobalto s?o de extrema import?ncia, devido: ? escassez e pre?o do cobalto e principalmente pelo sistema WC-Co ser carcinog?nico. O objetivo da referida tese de doutorado foi analisar a viabilidade do uso dos ligantes alternativos 316L e FeNi com adi??o de cromo no WC. Ambos os sistemas WC-316L (teores de ligante de 5, 7 e 20%) e WC-20%FeNi com adi??o de cromo (em 5, 10 e 20%) foram processados pela rota de metalurgia do p?, seguindo as etapas: prepara??o das misturas, moagem (1h, 24h), compacta??o uniaxial (200 MPa) e sinteriza??o a v?cuo (1400oC/1h). As caracteriza??es realizadas em todas as amostras sinterizadas foram: microsc?pia ?tica e eletr?nica, difra??o de raios x, satura??o magn?tica e coercitividade, dureza, ataque qu?mico eletrol?tico. Foi realizado c?lculos das sec??es verticais dos diagramas de fase para o sistema WC-FeNi com adi??o de cromo. Os resultados obtidos e discutidos demonstram que o ligante 316L n?o ? uma alternativa viav?l em metal duro devido conter elevado teor de cromo. O ligante alternativo 316L quando sinterizado com carbeto de tungst?nio sempre precipitar? fase eta, fato que inviabiliza sua aplica??o como ligante alternativo em WC. Para o ligante FeNi com adi??o de cromo, os resultados demonstram que o m?ximo teor de cromo que pode estar contido em solu??o em WC, de forma que n?o haja precipita??o de carbeto de cromo ? de aproximadamente 4%. A adi??o de cromo acima de 4% em solu??o, leva ? precipita??o de carbetos complexos de cromo, e ainda reduz drasticamente a janela de carbono do comp?sito. / Hard metal WC-Co is used in the machining, drilling and or manufacturing of cutting tools. Currently, 70% of the cutting tools are WC-binder carbides. In production numbers, approximately 40,000 MT of WC-binder tools have been produced worldwide since 2011. Today, more than 90% of all WC-binder production uses cobalt as the main binder. The superiority of cobalt over other binders is linked to several factors, the main being the width of the carbon window in the phase diagram. The search for alternative binders that may at least partially replace cobalt is of extreme importance due to the scarcity and price of cobalt and especially the WC-Co system being carcinogenic. The goal of this doctoral thesis was to analyze the feasibility of using alternatives binders 316L stainless steel and FeNiCr alloy, in tungsten carbide. Both system WC-316L (5, 7 and 20% of binder contents) and WC-20%FeNi with addition of chromium (in 5, 10 and 20% in solution) were processed by powder metallurgy route following the steps: preparation of the mixtures, milling (1h, 24h), compaction uniaxial (200MPa) and vacuum sintering (1400oC/1h). The all samples were characterized by optical and electron microscopy, xray diffraction, magnetic saturation and coercivity, hardness and electrolytic etching. The calculation of vertical sections of the phase diagrams for the system WC-FeNiCr was made. The results obtained and discussed demonstrate that the binder 316L, is not a viable alternative in hard metal because it contains high chromium content. The binder 316L when sintered with tungsten carbide will always precipitate eta phase, which makes its application as an alternative binder in WC impossible. For the binder FeNiCr, the results demonstrate that the maximum content of chromium that may be contained in solution in tungsten carbide that there is no precipitation of chromium carbide is approximately 4%. The addition of chromium above 4% in solution leads to the precipitation of chromium complex carbides, and further drastically reduces the carbon window of the composite.

Made available in DSpace on 2014-12-17T14:06:57Z (GMT). No. of bitstreams: 1 SamuelNC_DISSERT.pdf: 3182728 bytes, checksum: 8bfe4bb2137c514846453d3aeb267c09 (MD5) Previous issue date: 2012-05-11 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / It seeks to find an alternative to the current tantalum electrolytic capacitors in the market due to its high cost. Niobium is a potential substitute, since both belong to the same group of the periodic table and because of this have many similar physical and chemical properties. Niobium has several technologically important applications, and Brazil has the largest reserves, around 96%. There are including niobium in reserves of tantalite and columbite in Rio Grande do Norte. These electrolytic capacitors have high capacitance specifies, ie they can store high energy in small volumes compared to other types of capacitors. This is the main attraction of this type of capacitor because is growing demand in the production of capacitors with capacitance specifies increasingly high, this because of the miniaturization of various devices such as GPS devices, televisions, computers, phones and many others. The production route of the capacitor was made by powder metallurgy. The initial niobium powder supplied by EEL-USP was first characterized by XRD, SEM, XRF and laser particle size, to then be sieved into three particle size, 200, 400 e 635mesh. The powders were then compacted and sintered at 1350, 1450 and 1550?C using two sintering time 30 and 60min. Sintering is one of the most important parts of the process as it affects properties as porosity and surface cleaning of the samples, which greatly affected the quality of the capacitor. The sintered samples then underwent a process of anodic oxidation, which created a thin film of niobium pent?xido over the whole porous surface of the sample, this film is the dielectric capacitor. The oxidation process variables influence the performance of the film and therefore the capacitor. The samples were characterized by electrical measurements of capacitance, loss factor, ESR, relative density, porosity and surface area. After the characterizations was made an annealing in air ate 260?C for 60min. After this treatment were made again the electrical measurements. The particle size of powders and sintering affected the porosity and in turn the specific area of the samples. The larger de area of the capacitor, greater is the capacitance. The powder showed the highest capacitance was with the smallest particle size. Higher temperatures and times of sintering caused samples with smaller surface area, but on the other hand the cleaning surface impurities was higher for this cases. So a balance must be made between the gain that is achieved with the cleaning of impurities and the loss with the decreased in specific area. The best results were obtained for the temperature of 1450?C/60min. The influence of annealing on the loss factor and ESR did not follow a well-defined pattern, because their values increased in some cases and decreased in others. The most interesting results due to heat treatment were with respect to capacitance, which showed an increase for all samples after treatment / Procura-se encontrar uma alternativa para os atuais capacitores eletrol?ticos de t?ntalo existentes no mercado, devido ao seu alto custo. O ni?bio ? um substituto em potencial, pois ambos pertencem ao mesmo grupo da tabela peri?dica e devido a isso t?m v?rias propriedades f?sicas e qu?micas semelhantes. O ni?bio apresenta diversas aplica??es tecnologicamente importantes e o Brasil possui as maiores reservas mundiais, em torno de 96%. Existe inclusive ni?bio contido em reservas de tantalita e columbita no Rio Grande do Norte. Esses capacitores eletrol?ticos possuem alta capacit?ncia especifica, ou seja, podem armazenar altas energias em volumes pequenos comparados a outros tipos de capacitores. Esse ? o principal atrativo desse tipo de capacitores, pois existe uma crescente demanda na produ??o de capacitores com capacit?ncia especifica cada vez mais alta, isso devido ? miniaturiza??o de diversos aparelhos como GPSs, televisores, computadores, celulares e muitos outros. A rota de produ??o do capacitor foi feita atrav?s da metalurgia do p?. O p? de ni?bio inicial fornecido pela EEL-USP foi primeiramente caracterizado atrav?s de DRX, MEV, granulometria a laser e FRX, para ent?o ser peneirado em tr?s granulometrias, 200, 400 e 635mesh. Os p?s foram ent?o compactados e sinterizados em 1350, 1450 e 1550?C usando dois patamares, 30 e 60min. A sinteriza??o ? uma das partes mais importantes do processo, pois afeta propriedades como porosidade e limpeza superficial das amostras, que afetaram grandemente a qualidade do capacitor. As amostras sinterizadas sofreram ent?o um processo de oxida??o an?dica, que criou um filme fino de pent?xido de ni?bio sobre toda a superf?cie porosa da amostra, este filme ? o diel?trico do capacitor. As vari?veis do processo de oxida??o influenciaram no desempenho do filme e conseq?entemente do capacitor. As amostras foram caracterizadas atrav?s de medidas el?tricas de capacit?ncia, fator de perdas, ESR, densidade relativa, porosidade e ?rea superficial. Ap?s as caracteriza??es foi feito um tratamento t?rmico de recozimento em atmosfera de ar a 260?C por 60min. Ap?s esse tratamento foram feitas novamente as medidas el?tricas. A granulometria do p? e a sinteriza??o afetaram a porosidade e por sua vez a ?rea especifica das amostras. Quanto maior a ?rea do capacitor, maior sua capacit?ncia. O p? que apresentou capacit?ncia mais alta foi o com menor granulometria. Temperaturas e tempos de sinteriza??o maiores causaram amostras com ?rea superficial menores, por?m, por outro lado a limpeza superficial de impurezas foi maior para esses casos, de maneira que deve ser feito um balanceamento entre o ganho que se obt?m com a limpeza das impurezas e a perda com a diminui??o da ?rea especifica. Os melhores resultados foram obtidos para a temperatura de 1450?C/60min. A influ?ncia do tratamento t?rmico de recozimento no fator de perdas e na ESR n?o seguiu um padr?o bem definido, pois seus valores aumentaram em alguns casos e diminu?ram em outros. Os resultados mais interessantes devido ao tratamento t?rmico foram com rela??o ? capacit?ncia, que apresentou um aumento para todas as amostras ap?s o tratamento

Made available in DSpace on 2014-12-17T14:46:47Z (GMT). No. of bitstreams: 1 RamonEAP_DISSERT.pdf: 1410551 bytes, checksum: dfe074204e595b296e1933aa794efa40 (MD5) Previous issue date: 2010-09-24 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The objective of this work - which is characterized analyze the search for symptomatic tuberculosis in practice and perspective of the Community Health Agent (ACS) in the districts of Natal. Methods: This is a cross-sectional study. The study population was 646 professionals, and conducted a probabilistic random sampling, stratified by districts. The data were collected from one instrument to collect data based on Primary Care Assesment Toll (PCAT) and analyzed by descriptive statistics. The sample consisted of ACS was 87% female. Among the study participants 58% completed high school and 120 months of exercise training (95% CI 111.9 to 129.5) on average. 90% were USF. The average follow-up of cases found were 2 cases of TB since the beginning of the career of the ACS and the last three years the average is presented in a case accompanied. The ACS received satisfactory ratings on the bond of trust with the user, so as access to homes in the community. The ACS reported for denying the fear of being positive result was the biggest reason for not performing the sputum. All units have a professional that responds to the Tuberculosis Control Program. Regarding the structural capacity of primary care settings for the diagnosis of TB, we observed satisfactory levels in different districts of pots for sputum collection, however, a point that deserves attention from managers is lack of materials for packaging sputum. Fear of positive result was one of the reasons for the refusal of sputum collection, followed by alcoholism. With regard to TB suspects, all responded that ACS always suspect when the user has TB coughs, but in all districts were noticed at low delivery of requests for applications for smear. BSR in TB control, is characterized in practice as a complex action goes beyond technical expertise and contact with the family that breaks with the Cartesian. The BSR is part of the ACS can perform them from the daily visits. We conclude that the ACS is difficult to achieve. This practice should not be the privilege of this actor, but the entire team of primary care. We must rethink the practices of TB care, seeing the health surveillance while aegis of the working process of primary care teams for early diagnosis and thereby reduce TB in communities / Uma das prioridades nas pol?ticas de controle da TB refere-se ao diagn?stico precoce da doen?a, nas visitas domiciliares dos Agentes Comunit?rios de Sa?de (ACS), em que se espera oportunamente a identifica??o dos Sintom?ticos Respirat?rios na comunidade. Assim, prop?s-se analisar a busca de sintom?ticos respirat?rios de tuberculose na pr?tica e perspectiva do Agente Comunit?rio de Sa?de nos distritos de Natal. Trata-se de um estudo de corte transversal, sendo realizado inqu?rito com os ACS do munic?pio de Natal/RN. A popula??o do estudo foi constitu?da por ACS inseridos nas Unidades B?sicas de Sa?de e Unidades Sa?de da Fam?lia totalizando 646 profissionais, sendo realizado amostragem de forma probabil?stica aleat?ria, estratificada por distritos, Utilizou-se instrumento de coleta de dados baseado no Primary care Assesment Toll, (PCAT), adaptado para aten??o ? TB por Ruffino-Netto e Villa (2009). O question?rio tem como marco te?rico os atributos da aten??o prim?ria, uma vez que os sistemas de sa?de que se baseiam nesses atributos apresentam-se com melhor desempenho. RESULTADOS: a amostra de ACS foi composta de 87% do sexo feminino. Quanto ao grau de forma??o, 58% conclu?ram o ensino m?dio, em que os ACS apresentaram em m?dia de 120 meses de exerc?cio profissional (IC 95% 111,9 129,5. 90% eram USF. A m?dia encontrada de acompanhamento de casos foi de 2 casos de TB desde o in?cio da carreira profissional do ACS e nos ?ltimos tr?s anos essa m?dia se apresenta de 1 caso acompanhado.Os ACS obtiveram ?ndices satisfat?rios quanto ao elo de confian?a com o usu?rio, assim como o acesso aos domic?lios na comunidade. Os ACS relataram para a recusa o medo do resultado ser positivo foi o maior motivo da n?o realiza??o da baciloscopia de escarro. A maioria dos ACS referiu que se sente preparado para orientar quanto ? coleta de escarro na comunidade. No que se refere ao acesso do usu?rio aos servi?os de sa?de, verificou-se proximidade dos domic?lios aos servi?os de sa?de, entretanto o tempo de espera para o atendimento ? longo. Todas as unidades possuem um profissional que responde pelo Programa de Controle da Tuberculose. Em rela??o a capacidade estrutural das unidades de aten??o prim?ria para o diagn?stico de TB, observou-se nos diferentes distritos n?veis satisfat?rios de potes para a coleta de escarro, no entanto, um ponto que merece aten??o por parte dos gestores ? falta de insumos para o acondicionamento do escarro. O medo do resultado positivo foi um dos motivos para a recusa da coleta do escarro, seguido do Alcoolismo. No que tange ? suspeita de TB, todos os ACS responderam que sempre suspeitam de TB quando o usu?rio apresenta tosse, por?m em todos os distritos foram verificados a baixa entrega de solicita??es de pedidos de baciloscopia. A BSR no controle da TB, caracteriza-se na pr?tica como uma a??o complexa vai al?m das habilidades t?cnicas e o contato com a fam?lia que rompe com o cartesianismo. A BSR ? papel do ACS, podendo realiz?-las a partir das visitas di?rias. Conclui-se que o ACS encontra dificuldades para a consecu??o. Essa pr?tica n?o deve ser privil?gio desse ator, mas de toda a equipe da aten??o b?sica. ? preciso repensar as pr?ticas de aten??o ? TB, vislumbrando a vigil?ncia em sa?de enquanto ?gide do processo de trabalho das equipes da aten??o b?sica, para o diagn?stico precoce e a redu??o da TB nas comunidades

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-26T23:58:51Z No. of bitstreams: 1 BeneditaCleideDeSouzaCampos_DISSERT.pdf: 4403566 bytes, checksum: c3c751a75b003cb890a6499c81c7642f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-31T22:03:44Z (GMT) No. of bitstreams: 1 BeneditaCleideDeSouzaCampos_DISSERT.pdf: 4403566 bytes, checksum: c3c751a75b003cb890a6499c81c7642f (MD5) / Made available in DSpace on 2016-08-31T22:03:44Z (GMT). No. of bitstreams: 1 BeneditaCleideDeSouzaCampos_DISSERT.pdf: 4403566 bytes, checksum: c3c751a75b003cb890a6499c81c7642f (MD5) Previous issue date: 2016-02-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A qu?mica mineral de granitos, juntamente com revis?o de dados qu?micos de rocha total e petrografia foram utilizados para determinar as condi??es de cristaliza??o e as implica??es na g?nese de granitos C?lcio-alcalinos de alto K Porfir?ticos. Seis corpos gran?ticos foram analisados: Monte das Gameleiras, Barcelona, Acari, Cara?bas, Tour?o e Catol? do Rocha, localizados nos dom?nios Rio Piranhas-Serid? e S?o Jos? de Campestre, NE do Brasil. Os pl?tons s?o representados por monzogranitos, texturalmente possuem f?cies porfir?tica compreendendo fenocristais de K-feldspato com tamanhos entre 5 a 15 cm. K-feldspato, plagiocl?sio e quartzo constituem a parag?nese f?lsica e dominante; enquanto biotita e anfib?lio representam os minerais m?ficos principais; titanita, minerais opacos, allanita, ep?doto, apatita e zirc?o s?o os principais acess?rios. Em rela??o ao ?ndice de Shand o granito Monte das Gameleiras mostra-se mais metaluminoso, enquanto os outros seguem a transi??o metaluminoso a peraluminoso. Em diagramas discriminantes qu?micos estes se apresentam com car?ter transicional (subalcalino). As an?lises de petrografia e qu?mica n?o exp?e as diferen?as dos granitos, por?m os resultados de qu?mica mineral revelam as diferen?as dos mesmos e podem ser divididos em dois grupos: a leste (Monte das Gameleiras, Barcelona e Acari) e a oeste (Cara?bas, Tour?o e Catol? do Rocha). As raz?es Fe/(Fe+Mg) da biotita mostra um aumentam do grupo leste para oeste com valores de 0,48 a 0,64 e 0,66 a 0,92 respectivamente. As raz?es Mg/(Mg+Fe2) do anfib?lio diminui nesse sentido com valores de 0,40 a 0,57 e 0,06 a 0,31. As condi??es de cristaliza??es para os granitos a leste (Monte das Gameleiras, Barcelona e Acari) mostram press?o entre 4.2 kbar a 5.8 kbar, com profundidades que variam de 15,9 km a 20,5 km a uma temperatura entre 710 ?C a 734?C e a oeste (Cara?bas, Tour?o e Catol? do Rocha) com press?es de 5,4 kbar a 7,1 kbar e profundidades que variam de 20 km a 23 km a uma temperatura entre 729 ?C - 753 ?C. Ambas as ?reas, tanto leste como oeste foram gerados a partir de magmas oxidados. As profundidades das intrus?es gran?ticas podem estar relacionadas aos deslocamentos de falhas e ao alto conte?do de ?gua e vol?teis que permitem que o magma de alguns plutons atinja n?veis mais rasos em rela??o aos outros. Os resultados mostram um aumento sistem?tico de temperatura e press?o de cristaliza??o dos pl?tons de leste para oeste sugerindo um espessamento crustal nessa dire??o nos dois dom?nios geol?gicos pesquisados. / The mineral chemistry from granites, chemical of whole rock and review of petrography were used to determine the crystallization conditions and the implications in the genesis of high-K calc-akaline granites that are porphyritics, localizated in the Rio Piranhas-Serid? (RPSD) and S?o Jos? de Campestre Domains (SJCD). Six granitic bodies were analyzed and that for the intrusive granites within the SJCD were named East granites: Monte das Gameleiras, Barcelona. The Acari granite intrudes the area RPSD, however, was called as granite east due to the characteristics of mineral chemistry is similar to east granites. Granites Cara?bas, Tour?o and Catol? do Rocha are intrusive in the RPSD and called west granites. The six bodies are located in the northeast of the Borborema Province, NE Brazil. The plutons are represented by monzogranites wich have porphyritic facies with phenocrysts of K-feldspar with sizes between 5 and 15 cm. The K-feldspar, plagioclase and quartz are the dominant paragenesis; while the biotite and amphibole are the main mafic minerals; and titanite, opaque minerals, allanite, epidote, apatite and zircon are the accessories minerals. The Monte das Gameleiras granite shows metaluminous aluminium saturation index, whereas the others plutons metaluminous to peraluminous. In geochemical diagrams, the granites present with transitional character (subalcalino). The petrographic and geochemical analysis didn't show the differences between the plutons, but according to the mineral chemistry they can be divided into two groups: Monte das Gameleiras, Barcelona and Acari (east) and Cara?bas, Tour?o e Catol? do Rocha (west). The Fe/(Fe + Mg) ratio of biotite shows an increase from east to west group with values from 0.45 to 0.64 and 0.66 to 0.92 respectively, and the Mg / (Mg + Fe2) of amphibole decreases with values from 0.40 to 0.57 and from 0.07 to 0.31. The crystallization parameters of east granites, The crystallization conditions for granites east (Monte das Gameleiras, Barcelona and Acari) show pressure between 3.8 kbar to 5.5 kbar, with depths ranging from 14 km to 21 km at a temperature between 701 ? C to 742?C and west (Cara?bas, Tour?o and Catol? Rock) with pressures to 4.8 kbar to 6.2 kbar and depths ranging from 18 km to 23 km at a temperature between 723 ? C - 776 ? C. Both areas, east and west were generated from magmas oxidized with ?FQM values (-1 a +2.0). The depths of granite intrusion failures may be related to offsets and high water content and volatile that allow the magma some plutons reaches shallower levels in relation to the other. The results show a systematic increase in temperature and crystallization pressure east of plutons west suggesting crustal thickening in that direction. The results show a systematic increase in temperature and crystallization pressure east to west plutons, suggesting crustal thickening in that direction in the two domains studied.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-27T00:10:08Z No. of bitstreams: 1 CarlaCamposAmico_DISSERT.pdf: 1356161 bytes, checksum: 101c435b8ddc8eeaadfbb5baac16b899 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-09-01T00:27:05Z (GMT) No. of bitstreams: 1 CarlaCamposAmico_DISSERT.pdf: 1356161 bytes, checksum: 101c435b8ddc8eeaadfbb5baac16b899 (MD5) / Made available in DSpace on 2016-09-01T00:27:05Z (GMT). No. of bitstreams: 1 CarlaCamposAmico_DISSERT.pdf: 1356161 bytes, checksum: 101c435b8ddc8eeaadfbb5baac16b899 (MD5) Previous issue date: 2016-05-13 / Esta pesquisa objetiva analisar, a partir da legisla??o, da doutrina e da jurisprud?ncia, o controle de constitucionalidade concentrado das leis e da execu??o or?ament?ria, diante da morosidade e debilidade do Poder p?blico em promover a gradual efetiva??o de direitos fundamentais sociais. Destaca que a implementa??o dos direitos fundamentais sociais elencados na Constitui??o Federal constitui imperativo para a Administra??o P?blica e que o Poder Judici?rio deve garantir sua efetiva??o, rebatendo cr?ticas que aludem ? neutralidade pol?tica da jurisdi??o, ? separa??o dos poderes e ? legitima??o constitucional. Ressalta a import?ncia do aprofundamento do conhecimento do or?amento p?blico que deve ser elaborado e executado de forma respons?vel, voltado para o atendimento das necessidades sociais da popula??o. Analisa o controle do or?amento p?blico nos ?mbitos interno, externo, popular e judicial. Real?a o controle de constitucionalidade difuso em a??es individuais e coletivas que buscam obter a imposi??o de obriga??es prestacionais ao Estado para a consecu??o do m?nimo existencial; e o controle de constitucionalidade das escolhas pol?tico-administrativas, como o mais vantajoso para minorar os transtornos causados ao planejamento or?ament?rio no decorrer do exerc?cio financeiro. Apresenta hip?teses em que a a??o direta de inconstitucionalidade e a argui??o de descumprimento de preceito fundamental podem ser utilizadas para impugnar atos normativos e administrativos ou omiss?es legislativas e administrativas atinentes ao or?amento p?blico, antes e durante o exerc?cio financeiro. Conclui, com embasamento nos estudos realizados, que h? a necessidade de abertura procedimental no controle de constitucionalidade concentrado do or?amento p?blico, nas fases de postula??o, instru??o, decis?o e execu??o, com o fortalecimento de mecanismos de democracia participativa e de di?logo institucional permanente entre os Poderes e destes com a sociedade para garantir a gradual concretiza??o de direitos fundamentais sociais integrantes do m?nimo existencial. / This research aims to analyze, from the point of view of legislation, doctrine and jurisprudence, the concentrated constitutionality control of laws and budget execution, given the slowness and weakness of the public power in promoting the progressive implementation of fundamental social rights. The methodology of this wok comprises a literature survey based on national and international doctrine and court decisions, especially the Brazilian Supreme Court, as well as the legislation related to the subject and other sources of investigative interest. It is pointed out that the implementation of fundamental social rights listed in the Constitution is mandatory for the public administration and the judiciary must ensure its execution, rebutting criticisms that allude to the political neutrality of jurisdiction, the separation of powers and the constitutional legitimacy. It is emphasized the importance of deepening the knowledge that the public budget should be defined and executed in a responsible manner, aimed at meeting the social needs of the population. It is analyzed the control of the public budget from internal, external, popular and judicial levels. It is emphasized the diffuse constitutional control in individual and collective actions that seek to impose obligations regarding social services on the State to achieve the existential minimum; and the control of constitutionality of political and administrative choices as the most advantageous way to minimize inconvenience to the budget during the financial year. It presents hypotheses in which the direct action of unconstitutionality and the claim of breach of fundamental precept can be used to contest normative and administrative acts or legislative and administrative omissions related to the public budget, before and throughout the financial year. Based on the studies carried out, it is concluded that there is the need for procedural opening in concentrated control of constitutionality of the public budget at the postulation, instructions, decision and execution stages, strengthening the participative democracy mechanisms and permanent institutional dialogue between the Powers and also between them and the society to ensure the progressive realization of fundamental social rights that comprise the existential minimum.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-29T22:36:35Z No. of bitstreams: 1 DelsonAlvesDaCosta_DISSERT.pdf: 5285232 bytes, checksum: 07851f6bf3e3cb62a1879006d58b7756 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-09-06T22:15:19Z (GMT) No. of bitstreams: 1 DelsonAlvesDaCosta_DISSERT.pdf: 5285232 bytes, checksum: 07851f6bf3e3cb62a1879006d58b7756 (MD5) / Made available in DSpace on 2016-09-06T22:15:19Z (GMT). No. of bitstreams: 1 DelsonAlvesDaCosta_DISSERT.pdf: 5285232 bytes, checksum: 07851f6bf3e3cb62a1879006d58b7756 (MD5) Previous issue date: 2016-04-28 / O presente projeto foi pensado em fun??o da utiliza??o do potencial dos recursos naturais, mais especificamente sol e vento, existentes no Rio Grande do Norte, para a gera??o de energia el?trica atrav?s de um Sistema H?brido de Gera??o de Eletricidade - SHGE conectado ? rede COSERN, composto por um arranjo de pain?is fotovoltaicos e uma turbina e?lica incluindo o Regulador Eletromagn?tico de Frequ?ncia-REF. Para tanto, foi escolhido o Campus da Cidade de Macau, em fun??o do espa?o f?sico dispon?vel na unidade acad?mica da Universidade Federal do RN e das caracter?sticas favor?veis de sol e de vento do munic?pio. A partir dos dados de irradia??o solar, velocidade de vento, curva de carga, e de especifica??es de turbinas e?licas, de pain?is fotovoltaicos e de baterias, com a utiliza??o do software Scilab, vers?o 5.5.2, chegou-se a uma combina??o de equipamentos para atender a demanda do Campus. Literatura t?cnica espec?fica, normas e trabalhos acad?micos foram consultados na busca por uma solu??o satisfat?ria para o projeto, valendo salientar que a ideia foi priorizar as fontes renov?veis, e que, apesar de ser um sistema conectado ? rede, a alimenta??o da unidade consumidora pela COSERN e pelo gerador diesel s?o consideradas situa??es de exce??o. O projeto ? constitu?do por cinco plantas, memorial descritivo e rela??o de material, a ser registrado no Conselho Regional de Engenharia e Agronomia do RN - CREA-RN como trabalho acad?mico. / This project was designed for the use of the potential of natural sources, more specifically sun and wind, in the Rio Grande do Norte to generation electricity through an Hybrid Power Generation System - HPGS connected to COSERN network, composed of an array of photovoltaic panels and a wind turbine with the use of an Electromagnetic Frequency Regulator-EFR. Thus, the Campus Macau was chosen depending on the physical space available in academic unit of UFRN and the favorable characteristics of sun and wind in the city of Macau-RN. Using data of solar radiation, wind speed, load curve, and turbine specifications, photovoltaic panels specifications and battery specifications, and by a selection with use the Scilab software, version 5.5.2, academic papers and specific technical literature was founded a satisfactory solution so that the project meets the demand of the campus, primarily with the HPGS, and the generation options only for the network COSERN and the possible diesel generator, but considered situations of exception. The project consists of five plants, descriptive memorial and relationship material, and will recorded in the Regional Council of Engineering and Agronomy of RN State ? CREA-RN, as academic work.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T13:40:49Z No. of bitstreams: 5 ana.pdf: 1542449 bytes, checksum: 6abec3dbd7b8c5cd7aec1cd8cc44d636 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T18:10:12Z (GMT) No. of bitstreams: 5 ana.pdf: 1542449 bytes, checksum: 6abec3dbd7b8c5cd7aec1cd8cc44d636 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Made available in DSpace on 2015-02-27T18:10:13Z (GMT). No. of bitstreams: 5 ana.pdf: 1542449 bytes, checksum: 6abec3dbd7b8c5cd7aec1cd8cc44d636 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) Previous issue date: 2013-02-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / O presente trabalho descreve o desenvolvimento de um sensor voltam?trico altamente seletivo e sens?vel para dopamina (DA), ?cido asc?rbico (AA) e ?cido ?rico (AU) utilizando um eletrodo de grafite pirol?tico de plano basal modificado com 1,4-naftoquinona adsorvida sobre nanotubos de carbono de paredes m?ltiplas (EGPPB/NTCPM/NQ). Imagens de Microscopia Eletr?nica de Varredura foram utilizadas para caracterizar os materiais. Os processos de oxida??o de DA, AA e AU foram investigados por Voltametria C?clica (VC) e Voltametria de Pulso Diferencial (VPD). O eletrodo modificado apresentou excelente atividade catal?tica para oxida??o de DA, AA e AU, fornecendo tr?s picos voltam?tricos bem definidos em aproximadamente ? 0,050, 0,145 e 0,270 V vs. Ag/AgCl, respectivamente, por VPD. Ap?s a otimiza??o dos par?metros experimentais (solu??o 0,1 mol L-1 de tamp?o fosfato pH 7,5), obteve-se as curvas anal?ticas para DA, AA e AU, cujas faixas de linearidade foram 10,0-70,0 nmol L-1, 40,0-280,0 ?mol L-1 e 2,0-14,0 ?mol L-1, respectivamente. Os limites de detec??o e sensibilidade foram, respectivamente, 0,126 nmol L-1 e 0,653 ?A/ nmol L-1 para DA, 2,136 ?mol L-1 e 0,076 ?A/ ?mol L-1 para AA e 0,018 ?mol L-1 e 9,888 ?A/ ?mol L-1 para AU. O sensor foi aplicado com sucesso em amostras de urina humana e os resultados mostraram que o mesmo n?o sofre interfer?ncia da matriz biol?gica. Estudos de adi??o e recupera??o dos analitos foram realizados para avaliar a exatid?o do m?todo e obteve-se uma porcentagem de recupera??o entre 95,14% e 101,49% para DA, 96,10% e 103,47% para AA e 97,90% e 102,32% para AU. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / The present work describes the development of a highly selective and sensitive voltammetric sensor for dopamine (DA), ascorbic acid (AA) and uric acid (AU) using a basal plane pyrolytic graphite electrode modified with 1,4-naphthoquinone adsorbed on multi-walled carbon nanotubes (EGPPB/NTCPM/NQ). Images of Scanning Electron Microscopy were used to characterize the materials. Oxidation process of DA, AA and AU were investigated by Cyclic Voltammetry (VC) and Differential Pulse Voltammetry (VPD). The modified electrode showed an excellent catalytic activity towards the oxidations of DA, AA and AU, providing three well-defined voltammetric peaks at ? 0.050, 0.145 e 0.270 V vs. Ag/AgCl, respectively, by VPD. After optimization of experimental parameters (0.1 mol L-1 phosphate buffer solution pH 7.5), the calibration plots were obtained for DA, AA and AU, in the range from 10.0 up to 70.0 nmol L-1, 40.0 up to 280.0 ?mol L-1 and 2.0 up to 14.0 ?mol L-1, respectively. The detection limit and sensitivity were, respectively, 0.126 nmol L-1 and 0.653 ?A/ nmol L-1 for DA, 2.136 ?mol L-1 and 0.076 ?A/ ?mol L-1 for AA and 0.018 ?mol L-1 and 9.888 ?A/ ?mol L-1 for AU. The sensor developed has been successfully applied in human urine samples and the results showed that the matrix biological does not affect the response of the sensor. Studies of addition and recovery for DA, AA and AU were carried out to evaluate the error of the method and was verified a recovery percentage between 95.14% and 101.49% for DA, 96.10% and 103.47% for AA and 97.90% and 102.32% for AU.

Disponibiliza??o do trabalho em conte?do parcial, conforme Termo de Autoriza??o. / Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2017-03-27T19:34:05Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) fernanda_souza_paula_parcial.pdf: 515579 bytes, checksum: f72e2289acf5068c063e2bd00f0fefc3 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-04-24T16:35:34Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) fernanda_souza_paula_parcial.pdf: 515579 bytes, checksum: f72e2289acf5068c063e2bd00f0fefc3 (MD5) / Made available in DSpace on 2017-04-24T16:35:34Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) fernanda_souza_paula_parcial.pdf: 515579 bytes, checksum: f72e2289acf5068c063e2bd00f0fefc3 (MD5) Previous issue date: 2017 / O trabalho investiga a utiliza??o de plataformas eletroqu?micas contendo filmes polim?ricos derivados do ?cido 4-aminosalicico (4-AMS) para imobiliza??o da enzima Urato oxidase (UOx) visando aplica??o na quantifica??o de ?cido ?rico (AU) em amostras de urina. Investigou-se a eletrodeposi??o do 4-AMS pelas t?cnicas de voltametria c?clica (VC) e cronoamperometria (CA) sobre eletrodos de grafite (EG). Por VC foram realizados 100 ciclos de potencial na faixa de -0,25 a 1,25 V ? 50 mV/s em solu??o 2,50 mM do mon?mero preparado em H2SO4 0,50 M. Utilizando a CA, a eletropolimeriza??o foi realizada a potencial constante de +0,928 V durante 5600s no mesmo meio reacional utilizado na VC. O poli(4-AMS) obtido por VC e CA mostrou dois pares redox, os quais est?o relacionados a eletroatividade do filme polim?rico, na regi?o de potencial de +0,50/+0,40 V. Contudo, maiores valores de Ipa e Ipc foram obtidos para os eletrodos modificados por VC, sugerindo que estes filmes s?o mais eletroativos. A deposi??o do azul da Pr?ssia (AP), mediador da rea??o de per?xido, foi investigada sobre os EG, com posterior modifica??o com poli(4-AMS). Notou-se que a presen?a do AP n?o altera o perfil voltam?trico da eletropolimeriza??o do 4-AMS. Contudo, quando comparada com a eletropolimeriza??o somente nos EG, obteve-se filmes mais resistivos e com menor eletroatividade. Analisando as propriedades eletroqu?micas e morfol?gicas, por VC conseguiuse filmes mais uniformes, com maior quantidade de material depositado e maior eletroatividade. A eletropolimeriza??o foi realizada tamb?m sobre eletrodos impressos de grafite contendo azul da Pr?ssia (EI/AP), onde posteriormente imobilizou-se 5 U da UOx, e o biossensor foi acoplado a uma c?lula de fluxo num sistema de an?lise por inje??o em fluxo (FIA) de linha ?nica. A vaz?o e o volume da al?a de amostragem foram otimizados em 2,10 mL/min e 200 ?L, repectivamente. O valor de pH da solu??o do analito foi otimizado em 8,27. Medidas de reprodutibilidade mostraram desvio padr?o de 2,15% (n=10). O biossensor respondeu linearmente para AU na faixa de 1,0 x 10-5 a 2,0 x 10-4 M, com limite de detec??o de 3,0 ?M. Amostras de urina foram dilu?das (1:10) e injetadas diretamente no biossensor. A reposta foi reprodut?vel mostrando baixo desvio padr?o para as medidas, e valores encontrados dentro da faixa esperada para o analito em amostras de urina. Testes de adi??o e recupera??o mostraram valores de 97,35% (?2,43). O biossensor mostrou-se bastante promissor para a proposta do trabalho, apresentando resultados muito satisfat?rios para as an?lises e par?metros investigados. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. / This work investigates the use of electrochemical platforms containing polymeric films derived from 4-aminosalicylic acid (4-ASA) modified with the enzyme Urate oxidase (UOx) for quantification of uric acid (UA) in urine samples. The electrodeposition of 4-ASA was investigated through Cyclic Voltammetry (CV) and Chronoamperometry (CA) on graphite electrodes (GE). 100 cycles were performed in the range of -0.25 to 1.25 V at 50 mV/s in 2.50 mM monomer solution prepared in 0.50 M H2SO4. Using CA, the deposition was performed at a potential of +0.928 V for 5600 s in the same CV reaction medium. The poly(4-ASA) showed two redox pairs related to the electroactivity of the polymeric film in the potential range of + 0.50 /+ 0.40 V. However, higher values of Ipa and Ipc were obtained for the electrodes modified through CV, suggesting that these films are more electroactive. The deposition of Prussian blue (PB), mediator of the peroxide reaction, was investigated on the GE with subsequent modification with poly (4-ASA). It was observed that the presence of PB does not alter the voltammetric profile of 4-ASA electropolymerization. However, when compared with the electropolymerization in bare GE, more resistive films were obtained with lower electroactivity. Analyzing the electrochemical and morphological properties through CV, more uniform films were obtained, with more material deposited and greater electroactivity. The electropolymerization of poly(4-ASA) was also conducted on screen printed electrodes containing Prussian Blue (SPE/PB), with subsequent immobilization of 5U of Uox. This biosensor was coupled to a flow cell in a Flow Injection Analysis (FIA) system of single line. The flow rate and the sampling loop volume were optimized at 2.10 mL/min and 200 ?L, respectively. The pH value of the analyte solution was optimized at 8.27. Reproducibility measures showed a standard deviation of 2.15% (n = 10). The biosensor responded linearly to UA in the range of 1.0 x 10-5 to 2.0 x 10-4 M, with a detection limit of 3.0 ?M. Urine samples were diluted (1:10) and directly injected over the biosensor. The response was reproducible with low standard deviation and values found within the range expected for the analyte in urine samples. Addition and recovery tests showed values of 97.35% (?2.43). The biosensor is very promising for the work proposal, presenting very satisfactory results for the analyzes and investigated parameters.

Made available in DSpace on 2014-12-17T13:56:55Z (GMT). No. of bitstreams: 1 AdrianaCAB_TESE.pdf: 8514186 bytes, checksum: 87744fa5d0871ca3e2bc3a015c729753 (MD5) Previous issue date: 2014-04-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The purpose of this research is to apprehend the perception that the ruling elite, especially the Presidents of the province of Rio Grande do Norte/Brazil, had about the potiguar city, that is, the urban localities existing in the province along the 19th century. By interweaving political, administrative, socioeconomic and spatial aspects, the study of this perception involves two distinct moments, which are also linked: a moment of apprehension of the city, that is, how the elite seizes, describes and criticizes the city; and, a second moment, which occurs simultaneously or after the first moment, of intervention in the city, in which the elite exposes its vision and projects for the city and for the territory. Rather than describing the potiguar city in itself, the research is an attempt to reveal how it was perceived along this process from a particular standpoint or discourse, official and elitist, which did not correspond necessarily or completely to what it was in reality. We tried to understand, always through the lens of the discourse, how the ruling elite perceived the potiguar city based on what their members thought about other urban realities, particularly of the advanced countries; how, within an integrated vision, this city was characterized in political, administrative, socioeconomic and spatial terms and how it consolidated itself along the period established for the research. Qualitative and historical in nature, this study was also methodologically developed based upon bibliographical and documental research. Given the fact that this research works with descriptions, comparisons and interpretations, it was necessary to make use of tools such as the discourse analysis in order to apprehend, as much as possible, what lay behind the words of the elite. The primary sources used were essentially the official documents produced by the Presidents of the province, as well as other documents written by top government officials and other members of the administration staff, all of them composing the so-called ruling elite of Rio Grande do Norte. Secondary sources were books and other publications, theses and dissertations, among others. The research made possible the identification of a certain perception of the potiguar city in the 19th century, which is certainly limited because it is grounded on a specific discourse - that of the political and administrative elite, but which, in spite of such a limitation, is still useful to understand the city and its evolution along the period established, among other noteworthy remarks / Esta pesquisa tem como objetivo apreender qual era a percep??o que a elite pol?tico-administrativa, em especial os Presidentes da prov?ncia do Rio Grande do Norte, tinha sobre a cidade potiguar ao longo do s?culo XIX. Entrela?ando aspectos pol?tico-administrativos, socioecon?micos, e f?sico-espaciais, o estudo desta percep??o envolve dois momentos distintos, que se articulam: um momento de apreens?o da cidade, isto ?, como a elite percebe, descreve e critica a cidade; e um segundo momento, concomitante ou posterior ao primeiro, de interven??o na cidade, no qual a elite exp?e sua vis?o e projetos para a cidade e para o territ?rio. Mais do que descrever a cidade potiguar em si, a pesquisa tentou desvendar como ela era ao longo desse processo a partir de um determinado olhar ou discurso, oficial e elitista, que podia n?o corresponder necessariamente e integralmente ao que ela era de fato. Tentamos entender, sempre pelas lentes do discurso, como a elite pol?tico-administrativa percebia a cidade potiguar ? luz do que seus membros pensavam sobre outras realidades urbanas, mormente dos pa?ses mais avan?ados; como, numa vis?o integrada, essa cidade se caracterizava em termos pol?tico-administrativos, socioecon?micos e f?sico-espaciais e como ela se consolidou ao longo do per?odo estudado. De natureza qualitativa e hist?rica, a investiga??o se fundamentou metodologicamente em pesquisas bibliogr?fica e documental. Por trabalhar essencialmente com descri??es, compara??es e interpreta??es, foi necess?rio fazer uso de instrumentais como a an?lise do discurso, para apreender, tanto quanto poss?vel, o que estava realmente por tr?s das palavras dessa elite. As fontes prim?rias s?o essencialmente os documentos oficiais produzidos pelos Presidentes de Prov?ncia, assim como outras fontes produzidas por t?cnicos de alto escal?o, e outros membros da classe pol?tica, todos compondo a chamada elite pol?tico-administrativa do RN. As fontes secund?rias foram livros, publica??es, teses e disserta??es pertinentes ao tema, entre outros. A pesquisa permitiu identificar uma determinada percep??o sobre a cidade potiguar no s?culo XIX, certamente limitada porque baseada num discurso espec?fico - o de membros da elite pol?tico-administrativa , mas que, mesmo assim, possibilitou entender essa cidade e sua evolu??o ao longo do per?odo estudado, entre outras observa??es dignas de nota