Um sistema para estimação da vazão de gás de poços produzindo por Plunger Lift para vaso separador de teste em plataformas de petróleo

This work intends to analyze the behavior of the gas flow of plunger lift wells producing to well testing separators in offshore production platforms to aim a technical procedure to estimate the gas flow during the slug production period. The motivation for this work appeared from the expectation of some wells equipped with plunger lift method by PETROBRAS in Ubarana sea field located at Rio Grande do Norte State coast where the produced fluids measurement is made in well testing separators at the platform. The oil artificial lift method called plunger lift is used when the available energy of the reservoir is not high enough to overcome all the necessary load losses to lift the oil from the bottom of the well to the surface continuously. This method consists, basically, in one free piston acting as a mechanical interface between the formation gas and the produced liquids, greatly increasing the well s lifting efficiency. A pneumatic control valve is mounted at the flow line to control the cycles. When this valve opens, the plunger starts to move from the bottom to the surface of the well lifting all the oil and gas that are above it until to reach the well test separator where the fluids are measured. The well test separator is used to measure all the volumes produced by the well during a certain period of time called production test. In most cases, the separators are designed to measure stabilized flow, in other words, reasonably constant flow by the use of level and pressure electronic controllers (PLC) and by assumption of a steady pressure inside the separator. With plunger lift wells the liquid and gas flow at the surface are cyclical and unstable what causes the appearance of slugs inside the separator, mainly in the gas phase, because introduce significant errors in the measurement system (e.g.: overrange error). The flow gas analysis proposed in this work is based on two mathematical models used together: i) a plunger lift well model proposed by Baruzzi [1] with later modifications made by Bolonhini [2] to built a plunger lift simulator; ii) a two-phase separator model (gas + liquid) based from a three-phase separator model (gas + oil + water) proposed by Nunes [3]. Based on the models above and with field data collected from the well test separator of PUB-02 platform (Ubarana sea field) it was possible to demonstrate that the output gas flow of the separator can be estimate, with a reasonable precision, from the control signal of the Pressure Control Valve (PCV). Several models of the System Identification Toolbox from MATLAB® were analyzed to evaluate which one better fit to the data collected from the field. For validation of the models, it was used the AIC criterion, as well as a variant of the cross validation criterion. The ARX model performance was the best one to fit to the data and, this way, we decided to evaluate a recursive algorithm (RARX) also with real time data. The results were quite promising that indicating the viability to estimate the output gas flow rate from a plunger lift well producing to a well test separator, with the built-in information of the control signal to the PCV

Controle inteligente de pressão para uma rede sem reservatório de abastecimento urbano de água

The sanitation companies from Brazil has a great challenge for the XXI century: seek to mitigate the rate of physical waste (water, chemicals and electricity) and financial waste caused by inefficient operating systems drinking water supply, considering that currently we already face, in some cases, the scarcity of water resources. The supply systems are increasingly complex as they seek to minimize waste and at the same time better serve the growing number of users. However, this technological change is to reduce the complexity of the challenges posed by the need to include users with higher quality and efficiency in services. A major challenge for companies of water supplies is to provide a good quality service contemplating reducing expenditure on electricity. In this situation we developed a research by a method that seeks to control the pressure of the distribution systems that do not have the tank in your setup and the water comes out of the well directly to the distribution system. The method of pressure control (intelligent control) uses fuzzy logic to eliminate the waste of electricity and the leaks from the production of pumps that inject directly into the distribution system, which causes waste of energy when the consumption of households is reduced causing the saturation of the distribution system. This study was conducted at Green Club II condominium, located in the city of Parnamirim, state of Rio Grande do Norte, in order to study the pressure behavior of the output of the pump that injects water directly into the distribution system. The study was only possible because of the need we had to find a solution to some leaks in the existing distribution system and the extensions of the respective condominium residences, which sparked interest in developing a job in order to carry out the experiments contained in this research

Análise de antenas de microfita com patches circulares sobre substratos anisotrópicos usando o método dos potenciais de Hertz

This work consists on the theoretical and numerical analysis of some properties of circular microstrip patch antennas on isotropic and uniaxial anisotropic substrates. For this purpose, a full wave analysis is performed, using Hertz Vector Potentials method in the Hankel Transform domain. In the numerical analysis, the moment method is also used in order to determine some characteristics of the antenna, such as: resonant frequency and radiation pattern. The definition of Hertz potentials in the Hankel domain is used in association with Maxwell´s equations and the boundary conditions of the structures to obtain the Green´s functions, relating the components of the current density on the patch and the tangential electric field components. Then, the Galerkin method is used to generate a matrix equation whose nontrivial solution is the complex resonant frequency of the structure. In the analysis, a microstrip antenna with only one isotropic dielectric layer is initially considered. For this structure, the effect of using superconductor patches is also analyzed. An analysis of a circular microstrip antenna on an uniaxial anisotropic dielectric layer is performed, using the Hertz vector potentials oriented along the optical axis of the material, that is perpendicular to the microstrip ground plane. Afterwards, the circular microstrip antenna using two uniaxial anisotropic dielectric layers is investigated, considering the particular case in which the inferior layer is filled by air. In this study, numerical results for resonant frequency and radiation pattern for circular microstrip antennas on isotropic and uniaxial anisotropic substrates are presented and compared with measured and calculated results found in the literature

Desenvolvimento de software para simulação de motores com dispositivos de partida baseada na integração do atp com o toprede

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Produção de grês porcelanato a partir de matérias-primas do estado da Bahia

The State Bahia, Brazil, presents different geological sites it with a very expressive variety minerals. It is situated among the very important States which produces minerals for industries, such as pointed aggregate, ornamentals stones and ceramics raw materials. Nowadays only four companies producting ceramics tiles. Porcelainized stoneware tiles is one of the noblest ceramics, depicting low water absorption (typically below of 0,5%), in addition to excellent staining resistance and mechanical strength. The present work aims at investigating the potential of local raw materials for the production of porcelainized stoneware tiles. For this purpose, these materials were characterized by X-ray fluorescence, X-ray diffraction, particle size analysis, thermal gravimetric analysis, thermal differential analysis and dilatometric analysis. Admixtures containing different compositions were prepared and fired at four temperatures, 1100 ºC, 1150 ºC, 1200 ºC and 1250 ºC with isotherm for 60 minute and heathing rate of 5 oC/min. After firing the samples, they were characterized by water absorption tests, linear retraction, analysis, apparent porosity, apparent specific mass, flexural strength, and microstructural analysis by X-ray diffraction and scanning electron microscopy . The results revealed three ceramics with porcelainized stoneware tiles characteristics and porcelain tile will be produce from raw materials originated in the State of Bahia

Caracterização e análise das propriedades da fibra de Macambira (Bromelia Laciniosa)

Concern for the environment and the exploitation of natural resources has motivated the development of research in lignocellulosic materials, mainly from plant fibers. The major attraction of these materials include the fact that the fibers are biodegradable, they are a renewable natural resource, low cost and they usually produce less wear on equipment manufacturing when compared with synthetic fibers. Its applications are focused on the areas of technology, including automotive, aerospace, marine, civil, among others, due to the advantageous use in economic and ecological terms. Therefore, this study aims to characterize and analyze the properties of plant fiber macambira (bromelia laciniosa), which were obtained in the municipality of Ielmo Marino, in the state of Rio Grande do Norte, located in the region of the Wasteland Potiguar. The characterization of the fiber is given by SEM analysis, tensile test, TG, FTIR, chemical analysis, in addition to obtaining his title and density. The results showed that the extraction of the fibers, only 0.5% of the material is converted into fibers. The results for title and density were satisfactory when compared with other fibers of the same nature. Its structure is composed of microfibrils and its surface is roughened. The cross section has a non-uniform geometry, therefore, it is understood that its diameter is variable along the entire fiber. Values for tensile strength were lower than those of sisal fibers and curauá. The degradation temperature remained equivalent to the degradation temperatures of other vegetable fibers. In FTIR analysis showed that the heat treatment may be an alternative to making the fiber hydrophobic, since, at high temperature can remove the hemicellulose layer, responsible for moisture absorption. Its chemical constitution is endowed with elements of polar nature, so their moisture is around 8.5% which is equivalent to the percentage of moisture content of hydrophilic fibers. It can be concluded that the fiber macambira stands as an alternative materials from renewable sources and depending on the actual application and purpose, it may achieve satisfactory results

Investigação dos processos hidrossedimentológicos em parcela experimental no semi-árido potiguar

In northeastern semiarid, seasonality on precipitation temporal distribution, high intensity storm events and inadequate management of native vegetation can promote soil erosion. Vegetation removal causes soil surface exposure, reduces soil water storage capacity and can be the source degradation processes. In this context, this approach aims to analyze water and soil erosion processes on a 250 m2 undisturbed experimental plot with native vegetation, slope 2.5% by using 2006 and 2007 monitoring data. The site was instrumented to monitor rainfall, overland flow runoff and erosion by using a 5 m³ tank downstream the plot. Soil erosion monitoring was made by transported sediment and organic matter collection after each event. Field infiltration experiments were made at 16 points randomly distributed within the plot area by using a constant head infiltrometer during drought and rainy seasons, respectively. Infiltration data revealed high spatial and temporal variability. It was observed that during the beginning of the rainy period, 77% of the events showed runoff coefficient less than 0.05. As the rainy season began, soil water increase produced annual species germination. High intensity storms resulted in runoff coefficients varying between 0.33 and 0.42. Once the annual species was established, it was observed that approximately 39% of the events produced no runoff, which reflects an increase on soil water retention capacity caused by the vegetation. A gradual runoff reduction during the rainy season emphasizes the effect of vegetative density increase. Soil erosion observed data allowed to fit an empirical relationship involving soil loss and precipitation height, which was used to analyze the plot installation impact on soil erosion. Observed soil loss in 2006 and 2007 was 230 Kg/ha and 54 Kg/ha, respectively

Determinação do coeficiente de decaimento bacteriano em wetland - alagado construído

Wetlands systems are considered nowadays as a treatment method that uses simple, easy operation and low cost technology, which has been used in various parts of the world and also in Brazil. Used alone or as a complement to other types of treatment systems, once it effectively removes nutrients, pathogens and other pollutants in the water. Due to the high complexity found in wetlands, making it difficult to predict the response of the system to treat wastewater, one should consider as ideal to base the sizing of the wetland system over the necessary removal of this parameter instead of scaling it from empiricism. The study was conducted to determine the coefficient of bacterial decrease in the Wetland unit located at Ponta Negra Station Sewage Treatment, located in Natal, the coastal region of Rio Grande do Norte. The most representative model to determine the bacterial decrease in this system was the one from Chick for hydraulic piston system. Kb of 0.37 d-1 were found for the flow rate of 15m³/d, while for the system operating at maximum design flow, 30m³/d, the Kb of 0.98 d-1 was found

Estimativa da evapotranspiração espacial em uma região semiárida utilizando sensoriamento remoto

With the need to deploy management and monitoring systems of natural resources in areas susceptible to environmental degradation, as is the case of semiarid regions, several works have been developed in order to find effective models and technically and economically viable. Therefore, this study aimed to estimate the daily actual evapotranspiration (ETr) through the application of the Surface Energy Balance Algorithm for Land (SEBAL), from remote sensing products, in a semiarid region, Seridó of the Rio Grande do Norte, and do the validation of these estimates using ETr values obtained by the Penman-Monteith (standard method of the Food and Agriculture Organization-FAO). The SEBAL is based on energy balance method, which allows obtaining the vertical latent heat flux (LE) with orbital images and, consequently, of the evapotranspiration through the difference of flows, also vertical, of heat in the soil (G), sensitive heat (H) and radiation balance (Rn). The study area includes the surrounding areas of the Dourado reservoir, located in the Currais Novos/RN city. For the implementation of the algorithm were used five images TM/Landsat-5. The work was divided in three chapters in order to facilitate a better discussion of each part of the SEBAL processing, distributed as follows: first chapter addressing the spatio-temporal variability of the biophysical variables; second chapter dealing with spatio-temporal distribution of instant and daily radiation balance; and the third chapter discussing the heart of the work, the daily actual evapotranspiration estimation and the validation than to the study area

Propaganda e discurso ideológico: um estudo dos slogans das campanhas de incentivo à leitura

Considérant que le Brésil est un pays considéré comme «non- lecteurs», nous avons essayé de trouver des solutions pour inverser cette situation d'exclusion sociale à travers des campagnes et des projets. Le slogan était le moyen de la propagande a proposé à cet effet. En étant un peu éclairante, il a été considéré qu'ils étaient peut-être inséré dans un contexte idéologique, en passant, qui faisait alors partie de l'objet d'études en question et, en conséquence, l'objectif était d'étudier comment, dans niveau discursif, les relations sociales de l'idéologie et du pouvoir dans ces dessins slogans verbaux et des campagnes publicitaires pour encourager la lecture. Nous avons utilisé comme instrument de collecte de données en 2007 slogans projets (sept) et l'intensification des campagnes de publicité dans les années 1995 à 2006, peu après la création de la descendance en 1992, où son fonctionnement a été analysé et discours idéologique, en cherchant à identifier les états effets de sens proposé. Nous avons utilisé pour soutenir la perspective de recherche d'analyse du discours de l'école française, affiliée à Pêcheux. Afin de sens les effets sens des tests a été fait une semi-ouverte aux enseignants qui traitent directement avec l'enseignement de la lecture de l'Institut de l'Enseignement Supérieur du Président-Kennedy, situé à Natal / RN. On été appliqués 100 questionnaires, parmi lesquels 60 d‟entre eux utilisés pour l‟analyse. La recherche a démontré par l'analyse, que la façon d'encourager les gens à lire se déplace à travers le modèle principal de la compréhension de la lecture à laquelle les slogans ont été utilisés, en les intégrant dans un discours dominant, qui ne contribue pas de manière significative à l'augmentation le nombre de lecteurs dans le pays. Grâce à l'analyse des slogans et la réception des sujets de recherche, nous nous rendons compte de la diversité et l'idéologie sont présents en elles, révélant tout le temps, la compréhension de la lecture comme une surface pratique, ne mettre en lumière certaines de ses fonctions Importantes au sein d‟um contexte éducatif plus large

Do dizer teórico às transposições didáticas: por um exercício da contrapalavra no ensino de língua escrita no PROJOVEM

This present work is going to show some results developed in the Master Degree research and the Post Graduation project in Language studies (PPgEL) at UFRN, under the orientation of Professor Maria da Penha Casado Alves. This research has questions showed by the Programa Nacional de Inclusão de Jovens PROJOVEM. Concerned to methodology, the research is based on Applied Linguistics and it is qualitative and documental. The corpus of the research are the Manual de Orientações Gerais and the Guias de Estudo. The documents that were used for the research were Guide for general orientation and the Study Guides.The Manual de Orientações Gerais was chosen because is focused on the teacher and the Guias de Estudo was chosen because are focused on the students. The discussions and analysis were based on Bakhtin (1997; 2003), for his studies about the language in a dialogical point of view, Faraco (2001 and 2008) and Suassuna (2006) for their discussions about the Portuguese Language and Geraldi (1997; 2005 and 2006) and Antunes (2003) for their orientation and discussions about the teaching process of the written language. The analysis made in the Reference Topics point that however the program proposes a kind of rupture with the traditional way of teaching, it could not take this change to the Study Guides (Guias de Estudo). The result is a didactic material that reproduces activities based on a conception of a descriptive and prescriptive teaching. What is concerned about the proposals for the textual production, it is shown that it is given in an artificial way, without any expression and with no link to any communicative context and sometimes, with no relation to the topic it was supposed to be related to

A (não) assunção da responsabilidade enunciativa no gênero acadêmico artigo científico produzido por alunos do curso de Letras

This research is inserted in Textual Analysis of Discourses (from now on, TAD), elaborated by linguist J-M Adam and developed nowadays by scholars from Brazilian textual linguistic. ATD consists of a theoretical and descriptive perspective from Textual Linguistics that is concerned about a theoretical and methodological position which sets Textual Linguistics in the most extensive Discourse Analysis panorama. In this work, on the enunciative level of text we investigate: the enunciative responsibility (ADAM, 2008) in 14 examples of the academic genre paper published in the journal Ao Pé da Letra and written by university students from degree in Language. The research is oriented by the studies about enunciative responsibility by Adam (2008, 2010), Rabatel (2010), Guentchéva (1994), the perspective of discursive heterogeneity by Authier-Revuz (2004). We established as general objective: (1) Analyzing the occurrence of the (not) assumption of enunciative responsibility in the academic genre paper . The analysis followed the qualitative paradigm on an interpretative basis. The conclusions show, therefore, the excerpts of the discursive genre used to present the analysis reveal a particular nature of using the recourse to the discourse of several knowledge sources that many times can (not) be assumed by the enunciator.

A aula de português no ensino médio: o ensino que se deseja, o ensino que se faz

Settled within the realm of a problematization towards teaching and learning the Portuguese language, this study aims to investigate the way how the Portuguese Language discipline is dealt with in Secondary School. We propose specifically to analyze the orientations of the official documents concerning the educator practice, examining the way the PCNEM proposal is approached in the didactic book, identifying the treatment given to language questions, analyzing the way the teacher uses the didactic book and verifying the relations between the official approach and the pedagogical practice. The analysis takes into account the several discourses concerning school literacy, considering the various political-educational instances which institutionalize the teaching of the mother tongue - where we locate the teaching that is wanted . In what teachers and students say in their activities and concerning them - the realm of the teaching that is performed - we presuppose that there are signs of the principles - or conceptions - that orientate what they understand by language, teaching and learning. Such evidences are considered within the interrelation of the enunciative places where this literacy is promoted: the public policies concerning education - focusing the language questions - the academic researches about those questions, the educator formation and capacitation and the very school practices in the complexity of their discoursive inter-subjectivity. The principles - or conceptions - are pursued in what is said (or not) about what is done (or not) in the classroom when dealing with the Portuguese Language. The corpus is made up of oral and written texts produced in Portuguese classes in the Secondary School at a public school in the city of Natal, Rio Grande do Norte, Brazil. Situated in the realm of Applied Linguistics, the research is conducted in a qualitative and interpretative perspective, following the ethnography of communication procedures and the contributions of the Functional Linguistics. In the observations, language conceptions were discerned, among others, besides beliefs and representations where the theoretical and practical aspects, professional roles, expectations and uncertainties were diluted.

Eensino de língua portuguesa: da formação do professor à sala de aula

La reflexión crítica sobre la escuela y los quehaceres docentes ha favorecido la producción y la sistematización de nuevos saberes basados en fundamentos científicos, principalmente sobre las prácticas pedagógicas. En la enseñanza de Lengua Portuguesa, las investigaciones buscan comprender lo qué y cómo se enseña y se aprende durante la escolarización. En esa perspectiva, realizamos un estudio sobre la formación del profesor de Lengua Portuguesa y sus implicaciones en la clase, buscando observar la actuación de los alumnos-maestros en el contexto escolar, durante la realización de las Prácticas. Para tanto, elegimos como objetivo general, investigar cómo la carrera de Filología de la UFRN/CERES/Campus de Currais Novos promovía la formación de futuros profesores para atender a las expectativas de las políticas públicas para la enseñanza de Lengua Materna. Como referencial teórico, estudiamos los PCN, el proyecto político pedagógico de la carrera y autores del área de enseñanza de Lengua Portuguesa y de Educación, entre ellos, Geraldi (1996), Travaglia (1996, 2003), Antunes (2003, 2007, 2009 y 2010), Lomas (2003), Figueiredo (2005), Marcuschi (2001, 2008), Oliveira (2010), Riolfi et al. (2008), Possenti (2003), Alarcão (1996, 2001) Imbernón (2011), Pimenta y Lima (2010) y Schön (1993). El estudio está situado en el ámbito de la Lingüística Aplicada y se caracteriza como investigación cualitativa de naturaleza interpretativista, a partir de un abordaje de inspiración etnográfica del ambiente de las Prácticas. En los resultados constatamos que los alumnos-maestros privilegian la enseñanza prescriptiva, fundamentado en una concepción de lengua como sistema, direccionando la enseñanza de la lengua para la dirección contraria al abordaje funcionalista (lengua / uso), distanciándose considerablemente de la propuesta de formar un alumno crítico y agente de transformación. Respecto a la visión de los alumnos-maestros sobre la carrera, fueron listadas algunas cuestiones relevantes, entre ellas, los contenidos que hacen parte de la carrera, la distribución de la carga horaria de los componentes curriculares, la revisión de las ementas, la oferta de asignaturas de inclusión social, la reorganización de las actividades de la práctica en relación al acompañamiento y orientación a los alumnos-maestros y, especialmente, la desarticulación teoría / práctica que fue considerada como responsable por muchas de las dificultades encontradas por los referidos alumnos en la fase de regencia de clase en la enseñanza de Lengua Portuguesa en los niveles de enseñanza fundamental y media. De ese modo, a partir del análisis de estos significados construidos por los alumnos-maestros sobre el proceso de formación en esa carrera de Letras, constatamos la necesidad de una revisión del proyecto de la carrera, pues éste presenta esas fragilidades que necesitan ser analizadas en función de la mejoría de la calidad de la enseñanza de la graduación

Manual do professor, muito prazer em (re)conhecê-lo! Uma análise sociorretorica do gênero

Esta pesquisa de natureza documental e etnográfica se insere no campo da Linguística Aplicada, tendo por objeto de estudo o Manual do Professor, que acompanha o livro didático de Língua Portuguesa, e por objetivo geral (re)conhecer os aspectos sociorretóricos do gênero Manual do Professor. O interesse desta tese está concentrado no uso situado desse gênero, a partir do qual se observam seus aspectos sociorretóricos, a saber: o que está posto no produto, o ambiente de interação onde é encontrado e como é visto por seus usuários em potencial. Em um primeiro momento, produzimos um quadro epistemológico que nos permitiu, dentre outros reparos, (i) compreender gênero textual como ação retórica tipificada baseada numa situação retórica recorrente e (ii) obter um panorama dos programas de governo voltados para a avaliação de coletâneas didáticas, nos quais encontramos aspectos indispensáveis a um Manual do Professor. Os aportes teóricos adotados neste estudo referem-se à concepção sociorretórica dos estudos de gênero textual à luz, sobretudo, de Johns et al. (2006), Bazerman (2011) e Miller (2011). Em um segundo momento, sob o viés da abordagem sociorretórica, procuramos definir o Manual do Professor como gênero textual e apresentamos os aspectos retóricos encontrados nas amostras que analisamos, considerando a organização constitutiva, o contexto de uso desse gênero e as percepções de seus usuários autores e professores. A geração de dados deu-se inicialmente a partir da seleção de três exemplares de Manuais de coletâneas didáticas adotadas no IFRN; em seguida, no sentido de reconhecer as percepções dos usuários desse gênero, realizamos grupo focal com professores e entrevistamos o coautor de uma das coletâneas. Para análise dos dados, elegemos o método etnográfico de análise de gêneros postulado por Reiff (apud JOHNS et al, 2006), que nos permitiu analisar o objeto de estudo em contextos autênticos de uso do gênero. Nossos resultados mostram que o Manual do Professor está inserido num sistema de gêneros e no sistema de atividades profissionais de domínio do professor e não se limita apenas a explicar como está organizado o livro didático do aluno. Outros sete propósitos foram observados, dentre os quais se encontram: possibilitar ao docente uma reflexão sobre a sua prática de ensino e sugerir caminhos para a melhoria do processo de ensino-aprendizagem. Acreditamos que esta pesquisa poderá estimular professores, em relação à importância (e não obrigatoriedade) de consultas periódicas aos Manuais; autores, no que se refere a estabelecer uma interlocução mais pessoalizada com seus leitores em potencial e no sentido de esclarecer ainda mais as facetas do livro didático; e editoras, sobretudo no que tange a recursos de editoração, para que o Manual do Professor se torne mais atrativo