Browsing by Issue Date, starting with "2005-05-07"

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Reforma autotérmica do metano: estudo do Processo e de catalisadores
(Universidade Federal de São Carlos, 2005-05-07)
Dias, Joelmir Augusto Costa
;
Assaf, José Mansur
;
https://lattes.cnpq.br/9563312407691130
;
https://lattes.cnpq.br/8994385933947902
;
https://orcid.org/0009-0000-5458-7765
The study of the autothermal reforming of methane over Ni/γ-Al2O3 catalyst, promoted with noble metals was the objective of this work. In the first part, the stability to coke deposition of the autothermal reforming was studied, through air addition to the feed of steam reforming, at 600oC over Ni/γ-Al2O3, at favourable conditions to coke deposition (CH4/H2O=4). It has been observed that the amount of coke decreased with the increase in air addition. This leads to the conclusion that the autothermal reforming of methane is a stable process to coke deposition. The second part of the work concentrated in the understanding of the effect of small amount (0,3% w/w) of the noble metals platinum, iridium and palladium for the steam reforming, partial oxidation and autothermal reforming of methane. The preparation of the platinum- and iridium-promoted catalysts was made via chloride. For the palladium, chloride and nitrate was used. It has been observed that the addition of noble metals allowed the reduction of the catalyst at lower temperature, increasing the reduction degree and, consequently, the metallic surface area of the catalyst. The small amount of noble metals did not cause any important electronic influence to nickel. Partial oxidation of methane also did not suffer any effect of noble metals, given that the non-promoted catalyst took this reaction to thermodynamic equilibrium. The steam reforming hat its conversion increased, and this increase was proportional to the metallic surface area. The same happened with autothermal reforming. This leads to the suggestion that the steam reforming is the limiting step for the autothermal reforming. Thus, it has been concluded that the unique important effect of the addition of platinum, iridium and palladium to the Ni/γ-Al2O3 catalyst, for autothermal reforming, is the increase in metallic surface area of the catalysts. The same catalysts were submitted to start tests of autothermal reforming of methane, without previous reduction with hydrogen. These tests were made through intermittent starts at 600oC, alternated with air flow at high temperature. The platinum- and iridium- promoted catalysts were active in all starts. For the catalysts promoted with palladium, only the ones prepared via nitrate was active. The palladium-promoted catalysts, via chloride, did not showed activity in autothermal reforming without previous reduction with hydrogen, being active only for combustion of methane, due to the non-reduction, due to the formation of palladium oxochloride, which has a strong interaction with alumina. In the third part of the work, the behavior of the steam and autothermal reforming and partial oxidation of methane in extended bed reactor was studied. The temperature profiles of the reactions were measured with the catalysts promoted with platinum and palladium. It has been verified that the partial oxidation and autothermal reforming occurs via combustion, parallel with steam and CO2-reforming. The promoted catalysts showed a flatter temperature profile than non-promoted catalyst, due to the difference of activity among them.
Mar de cana, deserto verde? Dilemas do desenvolvimento sustentável na produção canavieira paulista.
(Universidade Federal de São Carlos, 2005-05-10)
Gonçalves, Daniel Bertoli
;
Alves, Francisco José da Costa
;
https://lattes.cnpq.br/9183120186518337
The role of the sugar-cane production in the regional sustainable development has been lifting a lot of controversy on those last years. While the Brazilian sugar-cane sector is prominence in the international market, offering products of great value in terms of environmental sustainability, the workers and the local communities that live together with the sugar-cane production system alleges another reality, marked by the unemployment, bad field work conditions, environmental pollution, and bad distribution of income. This work makes an analysis about the social and environmental situation of the sugar-cane production in the sugar-cane area of the Hydrographic Basin of the river Mogi-Guaçú, main sugar-cane area of the State of Sao Paulo, identifying the main obstacles that this activity presents for the sustainable development, and the proposals and alternatives that exist for the improvement of the environmental and social conditions of this activity in the area. The analysis shows that the situation of environmental and social unsustainability in that meets the regional sugar-cane production system it will only be able to be solved through the consolidation of a regulatory endowment built by the group of the local society.
O sentimento do mundo: o corpo na poesia de Carlos Drummond de Andrade.
(Universidade Federal de São Carlos, 2005-05-10)
Perius, Cristiano
;
Ferraz Neto, Bento Prado de Almeida
;
https://lattes.cnpq.br/0084436724293824
Ce travail constitue une tentative de lecture du mouvement « phénoménologique » de la poésie de Carlos Drummond de Andrade. Ce mouvement sous-entend le temps historique, tout d´abord, mais surtout l´opération que transforme les choses en mots, en tension. En suite, le génitif de l´expression privilégié, « le sentiment du monde », c´est le jeu que se donne entre la subjectivité et l´objectivité, le « moi » et le « monde », instituant une intentionnalité ambiguë et incomplète entre les termes. Cette intentionnalité forme une distance intentionnel, i.e., la composition d´images qui naît tantôt d´un, tantôt d´autre, pour miroitement ou réversion.
Bioensaios de decomposição anaeróbia de macrófitas aquáticas da lagoa do Óleo (Estação Ecológica de Jataí, Luiz Antônio - SP)
(Universidade Federal de São Carlos, 2005-05-11)
Romeiro, Francisco
;
Bianchini Júnior, Irineu
;
https://lattes.cnpq.br/0659731944736389
This study aimed at investigating: i) the influence of temperature on decomposition of macrophyte detritus; ii) the importance of leaching in the dynamics of the decomposition; iii) the decomposition of different structures of aquatic plants and iv) the enzyme activity of xylanase during the decomposition. The samples of water and aquatic macrophytes were collected in the Óleo lagoon (Ecological Station of Jataí; 21º 36 S and 47º 49 W). Bioassays were performance (during 140 to 200 days) with macrophytes fragments and water samples incubated under controlled conditions. Periodically the productions of carbon dioxide (CO2) and methane (CH4) were determinate by gas chromatography and the enzymatic activities were measured from reaction mixtures (aliquots of the incubations and xylan solution) followed by reducing sugars dosage (colorimetric method). It was observed a positive correlation with temperature and detritus decomposition; once were verified greater consumption at higher temperatures. Temperature was important in the detritus fibrous fraction consumption (Q10 = 1.61) and in methanogenesis (Q10 = 3.17). The fractionating of dissolved (DOM) and particulate organic matter (POM), due to the leaching process, conduced to a increase in the consumption efficiencies of these fraction. The xylanase activity was only registered when the dissolved sugars leached from the detritus decreased. The roots were the most easily degraded structure of Scirpus cubensis; this specie was the most easily degraded, followed by Cabomba furcata; the Ludwigia inclinata was the most refractory. Overall, this study suggests that S. cubensis is one of the most important aquatic plant to the carbon cycling in the Óleo lagoon, once this specie present higher productivity and intense mineralization.
O uso da teoria de conjuntos aproximados na modelagem de bases de dados relacionais e na extração de conhecimento
(Universidade Federal de São Carlos, 2005-05-13)
Vieira, João Marcos
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Nicoletti, Maria do Carmo
;
https://lattes.cnpq.br/6454154048263145
This work investigates two relational database models that extend the standard relational database model. Both models extend the standard relational model by allowing ways to represent uncertainty. The rough relational database model borrows the basic concepts form the rough set theory and deals with uncertainty by approaching relations using their lower and upper approximations. The fuzzy rough relational database model generalizes the rough relational model by introducing a degree of membership associated to elements, in a rough relation. The operators that are an intrinsic part of each of the models are formally defined and their pseudocodes are presented and discussed in details. A prototype system ROUGH-ID3, which implements a hybrid knowledge extraction approach by integrating a set of rough database operators with the symbolic system ID3 is proposed.
Comportamento do psicólogo em Instituição de atendimento a deficientes mentais: contribuições da análise do comportamento para construção de uma prática crítica e relevante
(Universidade Federal de São Carlos, 2005-05-13)
Queiroz, Heloísa Lopes
;
Cortegoso, Ana Lúcia
Current conceptions of mental disabilities and the types of services needed by the mentally disabled point to the need to increase their autonomy and inclusion to the greatest extent possible, in relation to the living conditions of the non-disabled population. In the realm of psychology, despite the existence of knowledge relevant for producing actions compatible with this guideline, what is often observed among psychology professionals are actions related to establishing classifications and remedial interventions for problems that have established themselves, rather than actions that contribute to the effective understanding of the special needs of the mentally disabled, and interventions to promote behaviors that favor inclusion. In order for these changes to occur, relative to the actions of psychologists when attending to the mentally disabled, it is important to identify, describe and analyze behaviors that guarantee a new repertoire of actions for psychologists that work in institutions serving this population, promoting prevention of mental disabilities and maintenance of significant behaviors in psychologists treatment of the mentally disabled. This seems possible, considering existing knowledge regarding human behavior and how to deal with it. Thus, the proposal of this study was to identify and characterize, as environment-action relationships of the organism, behaviors of the psychology professional when acting to treat individuals who are mentally disabled, considering current practice and the available knowledge regarding the needs and challenges of serving this population. Information was gathered on the existing behavior, and desirable behavior, of psychologists in institutions serving the mentally disabled, in order to produce descriptions of the behavioral relationships that define the of professionals in this context. The information was obtained through interviews conducted with the psychologists and other high-level professionals that form part of the teams in two institutions serving the mentally disabled in the interior of the state of São Paulo. Based on this information, descriptions of the behavior of the psychologists were produced as a starting point for a more adequate understanding of their current repertoire and occasional gaps in this repertoire. Information was also obtained from the available literature related to behaviors, or aspects of behaviors, of these professionals that were considered relevant to the treatment of the mentally disabled, in institutional contexts, and compared to the descriptions produced, from the perspective of the interviewees, which then lead to complementation, revision, or even substitution of behaviors previously identified. It is hoped that the knowledge produced as a result of this study may contribute to improved education and training of these professionals, whether in their undergraduate or graduate studies, or the continuing education of professionals in the institutions themselves.
Transferência de tecnologia através de spin-offs: os desafios enfrentados pela UFSCar
(Universidade Federal de São Carlos, 2005-05-13)
Azevedo, Gustavo Carrer Ignácio
;
Torkomian, Ana Lúcia Vitale
With the appearance of a new world scenery, the markets are dominated by companies with high capacity of innovation. The university, one of the most important sources of knowledge, which fundamental role consists in the formation of human resources and in the performance of academic research, starts to be forced in a way that the results of its researches should bring more relevant economic and social impacts to the society in order to enrich and enlarge its role. As a consequence, the relationships of cooperation between universities and companies and the process of technology transfer from the university to the market gain importance. Among the known process of technology transfer, the creation of companies from the knowledge generated in the university (academic spin-offs), emerges as an alternative way to complement the traditional mechanisms. This study aims to characterize the process of technology transfer through the academic spin-offs, focusing the Federal University of São Carlos, and to identify its importance in the process of innovation, the employment creation, the relationships of cooperation between the university and companies and the local economic development. The methodology used was the qualitative research and case study, with field interviews and analysis of the contents. The results also show the received incentives and the main barriers faced by the academic spin-offs.
Estratégias cognitivas para o aumento da qualidade do hiperdocumento para educação a distância
(Universidade Federal de São Carlos, 2005-05-17)
Almeida, Vânia Paula de
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Silva, Junia Coutinho Anacleto
;
https://lattes.cnpq.br/6200743168568684
Actually, the concern with the quality of the products is present in all areas. In Distance Learning (DL), this concern should be even higher. The inherent difficulties of the physical distance between teachers and students enhance the necessity of teachers prepared to the edition of well planed courses, computer environments with adjusted resources and easy to be used, and students motivated to learn in distance. To have an effective process of teaching and learning in DL, it is necessary to support teachers during the instructional material development, helping them to establish the material structure, navigation, organization and layout, considering pedagogical aspects to facilitate the student knowledge construction. In this context, the objective of this work was to validate the use of some cognitive operators in DL context, verifying if the content organization resulted from the use of the cognitive operators enhance the hyper document usability and so its quality. To evaluate the use of the cognitive strategies in DL context, comparative studies were done in which usability evaluations were applied in hyper documents with and without operators.
Formação de agregados gelatinosos em culturas de microalgas de um reservatório eutrofizado (rio Tietê/SP)
(Universidade Federal de São Carlos, 2005-05-18)
Ortolano, Pedro Ivo Coelho
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Vieira, Armando Augusto Henriques
;
https://lattes.cnpq.br/4428377384377272
This work presents original data about aggregate formation by two diatoms, Aulacoseira granulata and Thalassiosira cf. duostra, isolated from Barra Bonita reservoir (Tietê river/ SP). Experiments were performed using a Couette floculator, a machine that promotes laminar fluid shear rates (G, s-1), in which particles in movement with several velocities will shock. Depending on their stickiness, the particles may or may not form aggregates. It was determined that different fluid shear rates can affect distinctly aggregate formation by the two algal species. At shear rates of 10 s-1, T. cf. duostra formed aggregates more intensively than A. granulata. However, aggregate formation by A. granulata was greater at a lower shear rate (3 s-1). The role of exopolysaccharides (EPS) produced by these species in aggregate formation by their cells/chains was also studied. The results showed that these compounds enhanced aggregation by both species. The addition of A. granulata EPS in Barra Bonita water, leaded to the formation of aggregates with larger relative surfaces (µm2) when compared to aggregates formed in Barra Bonita water in the absence of these compounds. This effect could be related to the hydrofobic characteristics of A. granulata EPS, which is composed of large amounts of terminal deoxy-sugars (fucose and rhamnose). When A. granulata chains were added to Barra Bonita water, the formed aggregates presented also larger relative surfaces. This increment leads to greater sinking rates and can promote important consequences for the cycling of matter in Barra Bonita reservoir.
Reestruturação agroindustrial e mudanças institucionais na rede láctea paulista.
(Universidade Federal de São Carlos, 2005-05-19)
Cunha, Juliano Cavalheiro da
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Paulillo, Luiz Fernando de Oriani e
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https://lattes.cnpq.br/9919942357089937
In a very complex sector like the milk it is important to discuss the Govern action. This issue has been discussed very hard in all international meetings about trading. In the Brazilian case its possible to visualize two different periods of Government action, the regulation and the self-regulation. So, the processes between these periods has caused different kind of impacts to the actors. Among all the problems created are the exclusion of milk producers, workers and cooperatives. The main issue of this work are the changes happened in the beginning of ninety years, when the Government stopped regulating the milk sector. Another objective is to describe and analyze the formation of the milk policy network in the São Paulo state considering the institutional environment and the governance structure. The object of analyze is the milk policy network, the unit of analyze is the negotiation among the actors and the variable of analyzes are the power resources (constitutional, policy, financial, organizational, technological and juridical).
Operadores pseudo-diferenciais e espaços de Hardy
(Universidade Federal de São Carlos, 2005-05-20)
Kapp, Rafael Augusto dos Santos
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Hounie, Jorge Guillermo
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https://lattes.cnpq.br/7302904386484949
Obs.:Devido a restrições dos caracteres especias, verifcar abstract em texto completo para download.
Um sistema para recuperação de imagens com base em características geométricas, conjuntos nebulosos e indexação métrica
(Universidade Federal de São Carlos, 2005-05-20)
Gavioli, Alan
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Biajiz, Mauro
;
https://lattes.cnpq.br/8331600770992494
In this work, the MIGFIR (Metric Indexing and Geometric Features-based Image Retrieval) system is presented. This system was developed mainly to make possible to index and retrieve certain image classes (like human face images, for example) with efficiency and accuracy using geometric measures, two new similarity functions and the metric access method called Slim-tree. This system also allows configuring important parameters during the definition of queries and makes possible to apply fuzzy sets and related concepts so that the language used in search expressions of one of the query classes that are supported be considerably close of the language usually applied by human beings. Efficiency and accuracy of the system at the execution of queries on several real and synthetic human face image sets are also presented. About efficiency, the obtained results show that MIGFIR can promote a quite considerable reduction of the execution time of queries in comparison with a similar approach that applies sequential scanning of the data. About accuracy, the results show that performance is satisfactory during the retrieval of human faces similar to certain example-images.
Uma arquitetura baseada em componentes para adaptação de conteúdo na Internet
(Universidade Federal de São Carlos, 2005-05-20)
Claudino, Renato André Takayama
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Souza, Wanderley Lopes de
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https://lattes.cnpq.br/3742302894743620
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https://lattes.cnpq.br/4530488988781991
Transientes, monoestabilidade e biestabilidade em processos de oxidação de eletrodos metálicos com formação de filmes : alguns casos simples
(Universidade Federal de São Carlos, 2005-05-23)
Brito, Gilberto Augusto de Oliveira
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D'Alkaine, Carlos Ventura
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https://lattes.cnpq.br/8699821828310072
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https://lattes.cnpq.br/8769820118747855
The simulation of simple models studied in this thesis showed that experimental current density/potential curves from processes of metal electrode oxidation with film formation can present peaks or discontinuities besides these curves can present the polarographic wave shape (sigmoidal shape). The experimental current density/potential curves wouldn t present hysteresis on quasi-stationary conditions. The peaks can be the result of measures made in non stationary conditions (transient conditions with measure times smaller than the relaxation time of the physical system under study) or conditions which looks like stationary conditions (transient conditons with measurement times bigger than the relaxation time of the physical system under study which could seem as stationary conditions) and the descontinuities would be the result of measures made in conditions which looks like stationary conditions. The experimental current density/potential curves presenting a peak or polarographic wave shape under conditions which looks like stationary conditions would point out that the physical system is in a monostability zone while those curves presenting discontinuities under conditions which looks like stationary conditions would point out that the physical system is in a bistability zone. Another important conclusion (obtained from the simulations) is that peaks and discontinuities in experimental current density/potential curves which are associated to the active/passive transition phenomenon can be the result of others phenomena. The stationary current density/potential curves simulated with the one adsorbed specie and constant dissolution model and the two adsorbed species and constant dissolution model, present the polarographic wave shape (this one due to these models are in a monostability zone) while the transient current density/potential curves present a peak. The stationary current density/potential curves simulated with the one adsorbed specie and oxide dissolution depending on coverage degree model and the two adsorbed species and oxide dissolution depending on coverage degree model can present the polarographic wave shape or a peak or hysteresis (hysteresis is due to these models are in a bistability zone) while the transient /E curves can present a peak or discontinuities (discontinuities are due to these models are in a bistability zone). Besides, the two adsorbed species and oxide dissolution depending on coverage degree model can present a kind of irreversibility when it is in a bistability zone.
Linguagem de padrões para apoiar o projeto de material instrucional para EAD
(Universidade Federal de São Carlos, 2005-05-23)
Talarico Neto, Américo
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Silva, Junia Coutinho Anacleto
;
https://lattes.cnpq.br/6200743168568684
Aplicabilidade de padrões de interação humano-computador e de engenharia de software no processo de desenvolvimento de sistemas interativos
(Universidade Federal de São Carlos, 2005-05-23)
Silva, André Constantino da
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Silva, Junia Coutinho Anacleto
;
https://lattes.cnpq.br/6200743168568684
Both Software Engineering (SE) and Human-Computer Interaction (HCI), two areas within Computer Science, propose process models, methods, techniques and tools for interactive systems development. However, those areas differ in their view of the task: while the SE main focus is the software product and its process, HCI focuses the interaction aspects between men and machine. However those areas are complementary, and there is a need of integrating the two views in the interactive systems development in a way to approach and treat, in a clear and defined way, interaction and implementation jointly. Motivated by that need, and the idea of increasing the developed systems quality, this work explores the concept of computational patterns in the support to the interactive systems development so that these are to a process model. Relationships between SE and HCI patterns are identified, thus promoting the integration of SE and HCI views.
Ação afirmativa e cotas: um percurso pela imprensa brasileira (de 1995 a 2002)
(Universidade Federal de São Carlos, 2005-05-23)
Santos, Ana Elisa de Carli dos
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Silvério, Valter Roberto
The racial question acquired centrality in the Brazilian context lately, due to mobilization arond the offer about especific public politics towards to black people, or affirmative action . This theme is fundamental because propose one reorientation in the sense of the socials relations with basis the race and colour. In this context, the press mass media has been one important sphere of boarding about the topic of the affirmative action. The captivation of the perceptions and representations furnished by national writting printing press constitute fountain of investigation of this search. The techniques of the content analysis and framing analysis has been used to capture the types of orientation that structure the news. The theme is bras in the mass media and this space of discussion supply one ample possibility of negotiation and political and social legitimacy of the interests of black people in Brazil.
Análise comparativa dos mecanismos de governança das redes agroindustriais avícolas da macrorregião de Ribeirão Preto SP e de Santa Catarina.
(Universidade Federal de São Carlos, 2005-05-24)
Pinotti, Raquel Nakazato
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Paulillo, Luiz Fernando de Oriani e
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https://lattes.cnpq.br/9919942357089937
This text has as objective main to carry through a comparative analysis it enters the power network of being poltry of the macroregion of Ribeirão Preto of the state of São Paulo and of the state of Santa Catarina, taking for base the individual and collective action of the actors and its main dynamic resources of power (constitutional, technological, financial, legal politicians and organizacionais ). From the studies of the characteristics of the actors of each network (number of participants; function, types of relation, structure and distribution of being able), were possible to verify that the catarinense poltry network presents more dynamic resources of power, greater coordination and harmony between its actors. The catarinense network has presence of formal relations of production, significant presence of dynamic resources of power and the legitimacy of the great industrial firms in the coordination of the system of integration and the network, while that the São Paulo network presents sufficiently distinct configuration: more types of actors (the independent agricultural producers, the intermediate and the corrector of chicken), low representation of its actors, informal relations of production and minor presence of dynamic resources power. In this context, it was possible to conclude that the networks possess trajectories of dependence (path dependence) well distinct, that lead to the structure of the distribution of dynamic resources of power presented.
C-CORE : uma Ferramenta de programação para construção e reuso de componentes
(Universidade Federal de São Carlos, 2005-05-24)
Souza Neto, Raphael Marcilio de
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Prado, Antonio Francisco do
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https://lattes.cnpq.br/2668568143800755
;
https://lattes.cnpq.br/5956634284343253
The Software Development contains several activities that are not always supported by tools that aid the Software Engineer and automate great part of his activities. Different researches have been accomplished and many resources have been spent aiming to construct tools that support the Software Development Process. Among these tools, stand out those that support project and implementation activities, and that are integrated with tools that support other activities of the software construction process. With those tools, it can be obtained a larger consistence of the results that are produced along the whole software development cycle. Another important point of the development process is related to obtain a software with better quality and less cost. One of the areas that is highlighted in the software production with quality and less cost, is those that researches the software components reuse. Thus, the Software Component Oriented Programming Tools integrated with modeling tools that aim mainly to improve the software productivity based on reuse is standing out. Motivated by these ideas, this work presents a tool denominated C-CORE, that supports the project and implementation of components and their applications integrated with other modeling tool, denominated MVCASE.
Estudo do desempenho de um precipitador eletrostático operando na captura de partículas submicrométricas e nanométricas
(Universidade Federal de São Carlos, 2005-05-24)
Falaguasta, Maria Carolina Ribeiro
;
Coury, José Renato
The removal of submicron particles from gaseous streams is becoming an increasingly important operation, both in industrial (nanotechnology) as well as in occupational (inhalation of particula te matter) applications. Among the equipments commonly employed for the removal of particula tes of the gaseous stream, the electrostatic precipitator, ESP, is the one capable of removing particles of such size with high efficiency. Furthermore, it has other advantages as the low pressure drop and the flexibility of working at higher temperatures. Therefore, the objective of this research was to evaluate the influence of operational and design parameters in the efficiency of particle removal of a plate-wire ESP operating in the removal of submicron particles. The precipitator was built in acrylic, with copper plates as collecting electrodes and stainless steel wires as discharge electrodes. The study was divided in two stages: the first studied the collection of PM2.5 (high risk particle matter), using alumina, with median diameter of 0.6 mm and maximum diameter of 2.5 mm as test powder, while the stage 2 focused the nanometric range, utilizing particles of sodium chloride, with diameters between 8 and 100 nm. In stage 1, the project parameters analyzed were duct length (L), diameter of the discharge electrodes (2r) and spacing between them (2c); the operational variables were the electric field (E) and the air velocity (v). Each variable was evaluated in two levels, whose values were Lne = 15 and 30 cm; 2r = 0.045 and 0.025 cm; 2c = 4 and 2 cm; E = 5 and 8 kV/cm and, finally, v = 0.5 and 1.0 m/s. The process performance was evaluated through the analysis of the global efficiency of removal of the particula te matter, obtained through isokinetic sampling. In stage 2, the project parameter analyzed were the duct length (Lne), the ratio s/2c and the distance between the collection plates (2s) and the operational variables were the air velocity (v) and current density (j). Each operation variable was evaluated in three levels, whose values were v = 0.125, 0.25 and 0.50 m/s and j = 1.8, 2.8 and 3.8 mA/m2. The project parameters were studied in two leve ls, Lne = 15 and 30 cm and 2s = 0.04 and 0.06 m. The process performance was evaluated through the analysis of the removal efficiency of the particulates obtained by particle counting, with the use of the Condensation Particle Counter 3007, from TSI. It was observed that the precipitator possesses high collection efficiency, even in the nanometric size range, were efficiencies larger than 99% were obtained, depending on the used configuration. As expected, the increase in air velocity, as well as the decrease of the collecting plate length and of the generated current caused a decrease in the efficiency. Conversely, larger spacing between plates resulted in an increment in the efficiency, phenomenon also observed by some other researchers for larger particles. The ratio s/2c did not show a clear tendency in particle removal. When compared to models from the literature, the one that offered the better adjustment to the experimental data was the classic Deutsch model when used with a drag coefficient given by a modified version of the Li and Wang (2003a e b) equation.