Modelagem estocástica do índice de radiação ultravioleta na costa leste do nordeste do Brasil

The increase in ultraviolet radiation (UV) at surface, the high incidence of non-melanoma skin cancer (NMSC) in coast of Northeast of Brazil (NEB) and reduction of total ozone were the motivation for the present study. The overall objective was to identify and understand the variability of UV or Index Ultraviolet Radiation (UV Index) in the capitals of the east coast of the NEB and adjust stochastic models to time series of UV index aiming make predictions (interpolations) and forecasts / projections (extrapolations) followed by trend analysis. The methodology consisted of applying multivariate analysis (principal component analysis and cluster analysis), Predictive Mean Matching method for filling gaps in the data, autoregressive distributed lag (ADL) and Mann-Kendal. The modeling via the ADL consisted of parameter estimation, diagnostics, residuals analysis and evaluation of the quality of the predictions and forecasts via mean squared error and Pearson correlation coefficient. The research results indicated that the annual variability of UV in the capital of Rio Grande do Norte (Natal) has a feature in the months of September and October that consisting of a stabilization / reduction of UV index because of the greater annual concentration total ozone. The increased amount of aerosol during this period contributes in lesser intensity for this event. The increased amount of aerosol during this period contributes in lesser intensity for this event. The application of cluster analysis on the east coast of the NEB showed that this event also occurs in the capitals of Paraiba (João Pessoa) and Pernambuco (Recife). Extreme events of UV in NEB were analyzed from the city of Natal and were associated with absence of cloud cover and levels below the annual average of total ozone and did not occurring in the entire region because of the uneven spatial distribution of these variables. The ADL (4, 1) model, adjusted with data of the UV index and total ozone to period 2001-2012 made a the projection / extrapolation for the next 30 years (2013-2043) indicating in end of that period an increase to the UV index of one unit (approximately), case total ozone maintain the downward trend observed in study period

Caracterização de superfícies de titânio modificado por oxidação à plasma

Recent years have seen a significant growth in surface modifications in titanium implants, resulting in shorter healing times in regions with low bone density. Among the different techniques, subtraction by chemical agents to increase oxidation has been applied for surface treatment of dental implants. However, this technique is generally unable to remove undesirable oxides, formed spontaneously during machining of titanium parts, raising costs due to additional decontamination stages. In order to solve this problem, the present study used plasma as an energy source to both remove these oxides and oxidize the titanium surface. In this respect, Ti disks were treated by hollow cathode discharge, using a variable DC power supply and vacuum system. Samples were previously submitted to a cleaning process using an atmosphere of Ar, H2 and a mixture of both, for 20 and 60 min. The most efficient cleaning condition was used for oxidation in a mixture of argon (60%) and oxygen (40%) until reaching a pressure of 2.2 mbar for 60 min at 500°C. Surfaces were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM), adhesion and cell proliferation. SEM showed less cell spreading and a larger number of projections orfilopodia in the treated samples compared to the control sample. AFM revealed surface defects in the treated samples, with varied geometry between peaks and valleys. Biological assays showed no significant difference in cell adhesion between treated surfaces and the control. With respect to cell proliferation, the treated surface exhibited improved performance when compared to the control sample. We concluded that the process was efficient in removing primary oxides as well as in oxidizing titanium surfaces

A magia do cinema na praça:apropriação do espaço e sociabilidade em Salvador-BA

It s in the city spaces, molded from the uses and daily appropriations, that life is woven, as a product of the social relationships from the accumulation of history along with the present day fabric. Within this relationship, the old and the new are elements which make up this tapestry, as a result of the contribution of successive generations. The public square is seen as an example of this relationship, since it consists of a fertile space for opportunities of urban life coexistence. It is within the trace of these considerations that the present study emerges regarding the appropriation and sociability of the Tomé de Sousa Square, located in the city of Salvador, BA, having as its main focus the special relation between the cinema and the public square, as it relates to the space of the exhibition of cinematographic art. The showing of films in public squares makes possible a distinctive means of appropriation which has occurred ever since the beginning of the cinema. Today in Brazil, projects of this nature abound, which aim at presenting the seventh art to a great portion of the population which doesn t have access to conventional movie theater projection rooms. This particular Projeto Cinema na Praça Cinema in the Square Project carried out in Salvador, has become the empirical reference point for such work. This journey reveals the fascination that this great art has woven through time, attracting and charming multitudes. The cinema touches people in a special way, stirring up affectionate feelings, which are reflected in multiple social practices. Regarding this work, what stands out above all are the projections in the squares, initiatives which make it possible for the films to be watched collectively. What was taken into account in order to carry out this work were the reports of those who came regularly to watch the cinema in the Square sessions, those involved with the cinema projects team, and the film makers. To do the work, besides a bibliographical revision, observations were made of participants in the Tomé de Sousa Square, taken from semi-structured interviews with people involved with the film projection projects and those who came regularly to the cinema in the Square sessions. Also investigations were made in newspapers, printed magazines and the internet, from document and iconographic sources. The photographic documentation proved to be an important contribution to the field work. The research therefore develops from the understanding that the social practices are what make possible the uses of and the appropriation of the spaces. Within this perspective the public square emerges as a privileged locus where possibilities flourish for multiple manifestations that social practices can generate

Os filhos evangélicos do novo caldeirão do diabo: a conversão religiosa na penitenciária de alcaçuz

The theme of the research is inserted at a field of intersection between the Sociology of Religion and Sociology of Violence, having as the general objective study the sociological meaning of the conversion of prisoners that lives at the biggest prison (Prison of Alcaçuz) of Rio Grande do Norte to the evangelical churches. The research is justified, because Brazil shelter the fourth greater arrested population arrested of the world, with projections indicating that it can turn the greatest in 2034. Besides, this study about religious conversion of prisoners to the Social Sciences is too important, because is a theme little developed in Brazil and deserves attention, one time that as the arrested people as the evangelicals are in expansion in our country. Starting from the precedent observations, we guide ourselves by the following problematic of research: the religious practice in Alcaçuz presents a mere instrumental perspective, where the actions of prisoners converted was on purpose oriented to conquest material or symbolic privileges; or purely religious, where seek a moral renovation? To develop the work, the scientific methodology adopted was exploratory and explanatory, using the Goffman´s theory about total institutions and presentation of self, and Blumer´s doctrine relating to Symbolic Interacionism and the Story life method, besides considerations about evangelical religion. Having this theoretical basis, was accomplished the Field research, when were made interviews and applied questionnaires to 11 Jailer Agents, 31 prisoners, Director and Vice-Dictor (in November, 2011), the coordinator of social projects of the prison and the coordinator of evangelization at the prisons in Rio Grande do Norte. As results, it was seeing in Alcaçuz that the prisoners can be separated in two groups: the one of Pavilions and other one of the Medical Section. The Pavilions are branded for managerial and structural problems, where are found idle prisoners in collective cells and with a historical of escaping attempts, mutinies and murders. The Medical Section has some individual cells or destined for two people, besides few collective also, and the prisoners work and have a more disciplined behavior, there isn t escapes or rebellions and that, for these reasons end for have more confidence from the Administration. About the presence of evangelical prisoners, most are at Medical Section, where exist a specific place to the cults (what doesn t at Pavilions). At the end, the conclusion is that the prisoner that says himself evangelical in Alcaçuz, although can be seeing with distrust about your real conversion, he gets win a trust vote and until the opposite being demonstrated in other words, that he is not hiding himself behind the bible to divert the vigilance of Direction and practice disciplinary faults without make any suspicions, is treated with more respect and has more opportunities live at Medical Section; have work, that most of times is paid and guarantee the homologation of your payment of penalty with work, besides other benefits, diminishing his time in jail

Avaliação radiográfica da cobertura acetabular à cabeça femoral, após osteotomia tripla e aplicação de cunha sacroilíaca, em pelve de cadáveres de cães

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

O atendimento educacional especializado no processo de inclusão escolar, na rede municipal de ensino de Mossoró/RN

This dissertation aims to analyze the specialized educational services(AEE, Portuguese) implemented in four municipal schools of Mossoró/RN, with attention to the process of collaboration between regular classroom teachers and multifunctional resource classroom teachers. We use as theoretical reference the works of Vygotsky and others authors that write about education and collaboration. To accomplish the research we chose a qualitative approach, using as a methodological resources: study of cases, bibliographical, documental and field research. For the field research we make observations in regular and multifunctional classrooms. We produce group intervieus with regular and multifunctional teachers. From the analysis performed we identify that the concepts and the practices of teachers in regular classrooms changes, with integrationist predominance. The AEE s teachers had more inclusive conceptions and greater investment in continuing education than the regular classroom teachers. The practices of regular classroom teachers are more traditional, what makes the learning process more difficult for the students, even more for the students with disabilities and pervasive developmental disorders. Teachers of AEE was more interactive and creative, however, the attention to the students was more individual. In three of the four schools surveyed stand out the efforts of the teachers of specialist classroom to collaborate with regular school teachers, by notes, e-mails, phone calls and resource sharing. In one of the four was noted a good collaborative interactive between the AEE teachers and the regular school teachers. The school with the worst improvement was that in which the actions of the teachers of the AEE were limited to actions in multifunctional resource classroom. The resistance to these professionals was identified in the statements of the regular classroom teachers. Another issue raised was the lack of time for teachers to conduct AEE actions that contribute to the process of school students, because their working hours is restricted to the opposite turn in school. Transport difficulties for the students to attend the resource classroom multifunctional and the lack of dialogue with the health sector was challenges for the four schools. The families were with a practically constant interest to interact with the AEE teachers in the four schools. Thus, we believe that the presence of AEE school can make contributions to the educational process, however, it is necessary more attention to the collaborative process between teachers and the school community

A aplicação dos temas transversais nas aulas de educação física - ensino médio integrado

A escola tem se guiado por ações pedagógicas do professor consideravelmente limitadas, as quais têm dificultado configurar com nitidez intenções educativas que contemplam a sua organização curricular. Nesse sentido, esta dissertação tem por objetivo apresentar uma experiência pedagógica da educação física a partir da operacionalização de temas transversais com os conteúdos curriculares no ensino médio integrado no IFRN, campus SGA. Os fundamentos teórico-metodológicos seguiram a linha qualitativa da pesquisa-ação. Participaram desta pesquisa estudantes dos cursos de Edificações e Informática do 1º ano do ensino médio integrado e a professora-pesquisadora, que é servidora efetiva do instituto. Optando pela pesquisa-ação, estruturamos uma intervenção pedagógica com intenção de promover a construção de conhecimento dos conteúdos da educação física com os temas transversais, tanto em amplitude como em profundidade, alicerçada no aporte teórico da teoria da ação dialógica (FREIRE, 2011) e da concepção aberta no ensino da educação física (HILDEBRANDT, 1986). A pesquisa teve como procedimentos a observação participante e a filmagem das aulas de educação física. As observações e os discursos dos estudantes foram organizados em categorias de questões, a saber: 1. Percepção dos estudantes sobre a educação física; 2. Sentidos e significados dos conteúdos da educação física na interfase com os temas transversais nas aulas; 3. Diálogos sobre a interação do conhecimento na relação professor-estudante. As observações e a análise dos depoimentos dos estudantes apontaram, em alguns momentos, que as aulas de educação física ainda são estruturadas no modelo rola bola , sem planejamento, configurando-se mera atividade, e não como prática pedagógica que trata dos saberes do campo da cultura de movimento. Por não constituir-se prática pedagógica que aborda os conteúdos de forma sistematizada, não se tem de forma precisa a ordenação e sequenciação dos aprendizados de práticas corporais, tampouco a introdução de temas transversais, os quais não poderiam ser aprendidos sem uma ação pedagógica concreta do professor. A interação professor-estudante afetiva e dialógica favoreceu que os estudantes se permitissem participar das experiências corporais de um jeito diferente, aceitando aprender os conteúdos curriculares em conjunto com os temas transversais, passando a perceber as aulas de educação física como espaços de experiências de movimento que lhes permitiram atribuir sentido/significado, além do conhecimento sobre o universo da cultura de movimento. A nosso ver, acrescentamos também que a escola não valorizou o trabalho com os temas transversais, pois a recente discussão sobre a inserção desses temas como temáticas relevantes, que devem ser tratadas pedagogicamente em conjunto nos componentes curriculares, ainda não é contemplada expressivamente no projeto curricular da escola

Violência ocupacional contra profissionais de saúde em um hospital de urgência. natal/rn, 2009

Descriptive exploratory study, with quantitative approach, with data collected from April to May 2009, aiming to identify the types of occupational violence affecting professionals on the nursing and medical staff in an emergency hospital service in Natal/RN, over the last 12 months; to identify emergency sectors where occupational violence episodes took place; to characterize aggressors on each type of occupational violence; to know the procedures adopted after each violent act targeting nursing and medical staff professionals; and to know the consequences of violence suffered by the nursing and medical staff professionals. The sample consisted of 26 nurses, 95 nursing assistants/technicians and 124 physicians, for a total of 245 professionals. The results showed that 50.61% of the professionals were women, aged 41 to 45 (22.45%), with post-graduate studies (51.43%), married (60.82%); 21.22% had 16 to 20 years of experience in the profession and in emergency practice; working 40 weekly hours (86.12%); and working both the day shift and the night shift (70.21%); 27.35% consider violence to be a part of their profession and the patient s companions as an important risk factor (86.53%); couldn t inform whether there was a specific established procedure for reporting occupational violence (45.71%); 73.06% suffered occupational violence in the 12 months; 70.20% verbal assault, 24.08% moral harassment, 6.12% physical assault, and 3.67% sexual harassment; 66.67% of the patients took part in the physical assault; the companions, in verbal assault (58.14%); and the health staff in moral harassment (69.49%); facing episodes violence, 37.65% of the professionals reported the fact to their co-workers; 57.25% uffered from stress as a consequence; on 4.71% of the episodes the professionals had to be bsent from work, resulting in 75 days of occupational violence-related absence. We conclude here was a high rate of occupational violence in the researched population, with verbal ssault and moral harassment as the most frequent violence types. Because factors related to ccupational violence were very diverse, actions seeking to confront this problem shouldn t be limited to the work environment itself. Education ought to be one of the most effective ctions for avoiding or minimizing these events occurrence

Aconselhamento em HIV/AIDS: ações e reflexões dos profissionais do Centro de Testagem e Aconselhamento (CTA)

The counseling on HIV/Aids consists in a prevention strategy that contributes to increase the diagnosis of HIV and start earlier the treatment. The counseling has as pillars the emotional and educational support, risks evaluation that aim at the adoption of safe practices and the individual s responsibility for his own health. To accomplish these results, it is necessary that health workers understand counseling as a unique educational moment that stimulates the user s critical-reflection when it comes to his role as an active subject in this process. This study aimed to analyze the counseling on HIV/Aids conducted by the professionals of the Testing and Counseling Center (CTA), based on the educational perspective of Paulo Freire . This is a descriptive qualitative study with a critical reflexive design based on the principles of Action-Science. All the professionals acting as counselors in the Joao Pessoa, PB CTA, eight in total, took part in the study. Data were collected during the month of March, 2011, through non participative observation and semi-structured interviews with a critical-reflexive focus, analyzed according to the tenets of the critical-reflexive methodology, and discussed taking into consideration the Paulo Freire s pedagogy and pertinent literature. It was observed that most of the professionals expressed the work philosophy of CTA as the diagnosis and prevention of the disease, associated with the utilization and demonstration of condoms. However, upon observation of their counseling sessions, these ideas were not converted in actions. Educational themes were not covered and the condom wasn t offered at any time. The counseling actions focused on the provision of information and filling out the paper forms which are necessary for attendance. The sessions were conducted with brief dialogues and little opportunity for the users to expose or complement their thoughts and needs. The professionals mentioned as facilitating conditions for counseling, the team interaction and physical structure. The difficulties focused on the users low cognition, the large demand for attendance, aspects related to the service organization, and the counselors absences and delays. After reflecting about the actions observed in the counseling, the majority of professionals admitted the need to modify their practice in the incorporation of educational principles for the achievement of a broader prevention, and seemed to be willing to work in this perspective. In conclusion, although the counselors show ideas consistent with the purposes of CTA, these ideas are limited when it comes to the understanding of the meaning of prevention in HIV/Aids. Taking into consideration that they express a certain comprehension and act differently during the counseling, they demonstrate a lack of bond between the theories in use and the proposed ones, in accordance with the contribution of the action-science theory. The counseling, as an educative practice, doesn t materialize in the counseling itself and the orientation for reflection is not given during the attendance. These findings suggest the need to include the process of reflection in the execution of the actions of counseling, so that these practices are guided by reflexive practice, aiming at transforming the way of thinking and acting into a more educational perspective toward a more democratic and holistic assistance.

Modelagem e controle de um microveículo aéreo: uma aplicação de estabilidade robusta com a técnica backstepping em uma estrutura hexarrotor

In this Thesis, the development of the dynamic model of multirotor unmanned aerial vehicle with vertical takeoff and landing characteristics, considering input nonlinearities and a full state robust backstepping controller are presented. The dynamic model is expressed using the Newton-Euler laws, aiming to obtain a better mathematical representation of the mechanical system for system analysis and control design, not only when it is hovering, but also when it is taking-off, or landing, or flying to perform a task. The input nonlinearities are the deadzone and saturation, where the gravitational effect and the inherent physical constrains of the rotors are related and addressed. The experimental multirotor aerial vehicle is equipped with an inertial measurement unit and a sonar sensor, which appropriately provides measurements of attitude and altitude. A real-time attitude estimation scheme based on the extended Kalman filter using quaternions was developed. Then, for robustness analysis, sensors were modeled as the ideal value with addition of an unknown bias and unknown white noise. The bounded robust attitude/altitude controller were derived based on globally uniformly practically asymptotically stable for real systems, that remains globally uniformly asymptotically stable if and only if their solutions are globally uniformly bounded, dealing with convergence and stability into a ball of the state space with non-null radius, under some assumptions. The Lyapunov analysis technique was used to prove the stability of the closed-loop system, compute bounds on control gains and guaranteeing desired bounds on attitude dynamics tracking errors in the presence of measurement disturbances. The controller laws were tested in numerical simulations and in an experimental hexarotor, developed at the UFRN Robotics Laboratory

Um ambiente integrado para manipulação de tráfego multicast

In the two last decades of the past century, following the consolidation of the Internet as the world-wide computer network, applications generating more robust data flows started to appear. The increasing use of videoconferencing stimulated the creation of a new form of point-to-multipoint transmission called IP Multicast. All companies working in the area of software and the hardware development for network videoconferencing have adjusted their products as well as developed new solutionsfor the use of multicast. However the configuration of such different solutions is not easy done, moreover when changes in the operational system are also requirede. Besides, the existing free tools have limited functions, and the current comercial solutions are heavily dependent on specific platforms. Along with the maturity of IP Multicast technology and with its inclusion in all the current operational systems, the object-oriented programming languages had developed classes able to handle multicast traflic. So, with the help of Java APIs for network, data bases and hipertext, it became possible to the develop an Integrated Environment able to handle multicast traffic, which is the major objective of this work. This document describes the implementation of the above mentioned environment, which provides many functions to use and manage multicast traffic, functions which existed only in a limited way and just in few tools, normally the comercial ones. This environment is useful to different kinds of users, so that it can be used by common users, who want to join multimedia Internet sessions, as well as more advenced users such engineers and network administrators who may need to monitor and handle multicast traffic

Odometria visual baseada em técnicas de structure from motion

Visual Odometry is the process that estimates camera position and orientation based solely on images and in features (projections of visual landmarks present in the scene) extraced from them. With the increasing advance of Computer Vision algorithms and computer processing power, the subarea known as Structure from Motion (SFM) started to supply mathematical tools composing localization systems for robotics and Augmented Reality applications, in contrast with its initial purpose of being used in inherently offline solutions aiming 3D reconstruction and image based modelling. In that way, this work proposes a pipeline to obtain relative position featuring a previously calibrated camera as positional sensor and based entirely on models and algorithms from SFM. Techniques usually applied in camera localization systems such as Kalman filters and particle filters are not used, making unnecessary additional information like probabilistic models for camera state transition. Experiments assessing both 3D reconstruction quality and camera position estimated by the system were performed, in which image sequences captured in reallistic scenarios were processed and compared to localization data gathered from a mobile robotic platform

Período de interferência de plantas daninhas em mandioca (Manihot esculenta) no noroeste do Paraná

A mandioca é uma exploração agrícola importante no Estado do Paraná. No entanto, há limitadas informações relacionadas à interferência das plantas daninhas nessa cultura. Objetivou-se com este trabalho estimar o período crítico de prevenção à interferência (PCPI) na cultura da mandioca (variedade Fécula Branca), nas condições edafoclimáticas do noroeste do Paraná. O experimento foi dividido em dois grupos de tratamentos: com períodos crescentes na presença de plantas daninhas (PAI); e com períodos crescentes na ausência de plantas daninhas (PTPI). Foram identificadas as espécies de plantas daninhas e densidades de infestação na área e calculada a importância relativa (IR), avaliando-se também o estande da cultura e a produtividade de raízes comerciais. As principais plantas daninhas presentes na área e que apresentaram os maiores valores de IR foram Cenchrus echinatus e Brachiaria decumbens. Aceitando-se uma tolerância de redução de produtividade de 5%, o PAI ajustado foi de 18 dias após o plantio da cultura, e o PTPI, de 100 dias. Concluiu-se que o PCPI da cultura para as condições edafoclimáticas do noroeste do Paraná situa-se entre 18 e 100 dias após o plantio.

Desenvolvimento e caracterização de nanocompósito de resina epóxi com nanopartículas de sílica para revestimento de dutos para transporte de petróleo

The use of polymer based coatings is a promising approach to reduce the corrosion problem in carbon steel pipes used for the transport of oil and gas in the oil industry. However, conventional polymer coatings offer limited properties, which often cannot meet design requirements for this type of application, particularly in regard to use temperature and wear resistance. Polymer nanocomposites are known to exhibit superior properties and, therefore, offer great potential for this type of application. Nevertheless, the degree of enhancement of a particular property is greatly dependent upon the matrix/nanoparticle material system used, the matrix/nanoparticle interfacial bonding and also the state of dispersion of the nanoparticle in the polymer matrix. The objective of the present research is to develop and characterize polymer based nanocomposites to be used as coatings in metallic pipelines for the transportation of oil and natural gas. Epoxy/SiO2 nanocomposites with nanoparticle contents of 2, 4, and 8 wt % were processed using a high-energy mill. Modifications of the SiO2 nanoparticles‟ surfaces with two different silane agents were carried out and their effect on the material properties were investigated. The state of dispersion of the materials processed was studied using Scanning and Transmission Electron Microscopy (SEM and TEM) micrographs. Thermogravimetric analysis (TG) were also conducted to determine the thermal stability of the nanocomposites. In addition, the processed nanocomposites were characterized by dynamic mechanical analysis (DMA) to investigate the effect of nanoparticles content and silane treatment on the viscoelastic properties and on the glass transition temperature. Finally, wear tests of the pin-on-disc type were carried out to determine the effects of the nanoparticles and the silane treatments studied. According to the results, the addition of SiO2 nanoparticles treated with silane increased the thermal stability, the storage modulus and Tg of the epoxy resin and decreased wear rate. This confirms that the interaction between the nanoparticles and the polymer chains plays a critical role on the properties of the nanocomposites

Estudo das propriedades físico-químicas de biocombustíveis microemulsionados

The development of new fuels is an important field of scientific and technological activities, since much of the energy consumed in the world is obtained from oil, coal and natural gas, and these sources are limited and not renewable. Recently it has assessed the employment of microemulsions as an alternative for obtaining fuel isotropic between phases originally not miscible. Among many advantages, emphasizes the application of substances that provide the reduction of levels of emissions compared to fossil fuels. Thus, this work was a study of various microemulsified systems, aiming to check the performance of the winsor regions front of the use of surfactants: RENEX 18 → 150, UNITOL L-60 → L-100 and AMIDA 60, together with structure of esters from soybean and castor bean oils. From the results it were chosen four systems to physico-chemical analyzes: System I RENEX 60, Soil bean oil, methylic ester (EMOS) and water; System II RENEX 60/AMIDA 60, EMOS and water; System III RENEX 70, mamona oil methylic ester (EMOM) and water and System IV RENEX 95, EMOM and water. The tests of physico-chemical characterization and study of temperature increase were done with nine points with different compositions in a way to include the interest area (microemulsion W/O). After this study, was conducted a modeling to predict the viscosity, the property is more varied as function of compositions systems changes. The best results were the systems II and IV with a temperature stability above 60°C. The system I had its physico-chemical characterization very similar to a fossil fuel. The system II was the best one due to its corrosivity be stable. In the modeling the four systems had shown good, with an error that varied between 5 and 18%, showing to be possible the viscosity prediction from the composition of the system. The effects the microemulsion and the engine´s performance with the microemulsion were also avaliated. The tests were performed in a cycle-diesel engine. The potency and consumption were analysed. Results show a slight increase the rendiment fuel compared with the conventional as well as a decrease in specific consumption