Fiberglass/thermoset matrix composite present important properties, such as specific mass and mechanical strength, aiming to replace some engineering materials. However, its mixture of different materials transforms them into an environmental problem, due to the complex recycling process. The highlight is meeting the demands of environmental pressures and for establishing recycling mechanisms, the proposal is to study physical recycling processes, focusing on the microwave-assisted pyrolysis process and also recovering fiberglass. The results were: humidity around 3 wt. %; the average loss of mass around 68 wt. %; the tensile strength is reduced by about 76 % when a composite with recycled fiberglass is laminated, as compared to the use of virgin fiberglass. This work establishing the physical recycling mechanism and route for composite materials, identifying the thermal degradation processes, for thus applying them to other materials, still considered environmental issues, technically and economically making these materials manufacturing processes viable, as well as establishing a recycling route.

Researches about nanomaterials related to properties such as superhydrophobicity, self-cleaning, corrosion and scratching resistance can be directly related to the materials’ wettability. This characteristic is quantified by the contact angle made between the surface and a water droplet, in which angles above 90 degrees are considered to be hydrophobic and those above 150 degrees, superhydrophobic. The focus of this work was the development of a superhydrophobic self-cleaning surface, using silica nanoparticles with a particle diameter around 400 nm to 800 nm (produced via sol-gel, referring to the classic Stöber method) functionalized with perfluorooctyltriethoxysilane (POTS) on a polymeric substrate polymethyl methacrylate (PMMA). Four different surface treatment conditions were analyzed: untreated, treated with non-functionalized silica nanoparticles, treated only with POTS and treated with silica nanoparticles functionalized with POTS. For this last condition, a static water contact angle of (150.0 ± 0.44) degrees and a dynamic water contact angle of (7.5 ± 0.38) degrees were obtained, which is a typical value of a superhydrophobic surface. However, the surface treated with POTS alone had a contact angle of 115 degrees. The high contact angle value was due to the low surface energy obtained, which was of (1.45 ± 0.02) dyn/cm. The modified superhydrophobic surface revealed a superior self-cleaning performance by freely rolling spherical water drops on the non-wettable solid surface. The stability of the modified surface has been proven by water jet impact.

This work aims to study the influence of cutting parameters (cutting speed, feed rate, cutting depth and tool cutting edge angle) regarding surface roughness and burr formation during the milling of a mixed structure comprised of titanium and carbon fiber (stack). The parameters were varied from maximum to minimum, just as the tool cutting edge angle of the insert, through a full factorial design with 32 trials. The analyses were performed by measuring the surface roughness and burr size along with metallographic analyses through optic microscopy and scanning electron microscopy. The results showed that the surface roughness was higher for carbon fiber and burr size was higher for titanium. There were a number of tests with delamination of the carbon fiber, and the best cutting parameters to minimize surface roughness and burr formation were tool cutting edge angle of 45º, a feed rate of 0.028 mm/tooth, cutting depth equal to 0.26 mm and cutting speed equal to 150 m/min.

Resumo O início da vida acadêmica é um período de grandes mudanças para o estudante, que muitas vezes é tratado de forma infantilizada no ensino médio e se depara com as responsabilidades e exigências da universidade. O presente trabalho teve como objetivo revisar artigos, publicados entre 2005 e 2015, referentes à adaptação universitária relacionada às vivências acadêmicas, rendimento e evasão, no curso de Engenharia. Para tanto, foram realizadas pesquisas nas seguintes bases de dados eletrônicos: Biblioteca Virtual de Saúde (BVS), Scielo Brasil e Portal de Periódicos Eletrônicos de Psicologia (PePSIC).Utilizaram-se os descritores: adaptação acadêmica, vivências acadêmicas, rendimento acadêmico, evasão e engenharia. Foram encontrados 55 artigos, porém somente 16 atenderam os critérios de inclusão. A maioria dos artigos empíricos relacionados (66,7%) utiliza o instrumento Questionário de Vivências Acadêmicas (QVA) ou Questionário de Vivências Acadêmicas - versão reduzida (QVA-r). Dois deles (13,3%) utilizaram esse instrumento conjuntamente com o Inventário de Habilidades Sociais e outros três (20,0%) com o Questionário de caracterização dos estudantes. Conclui-se que os relacionamentos interpessoais podem favorecer o rendimento acadêmico e adiar a evasão, assim como os serviços de apoio aos estudantes; e constatou-se a escassez do tema em questão nos cursos de engenharia.

Abstract The beginning of academic life is a period of great change for the student, who is often childishly treated in high school and faces the university's responsibilities and demands. The present work had the objective to review articles, published between 2005 and 2015, regarding the university adaptation related to the academic experiences, income and evasion, in the Engineering course. For that, research was carried out in the following electronic databases: Virtual Health Library (VHL), Scielo Brazil and Portal of Electronic Periodicals of Psychology (PePSIC). The following descriptors were used: academic adaptation, academic experiences, academic achievement, avoidance and engineering. We found 55 articles, but only 16 met the inclusion criteria. Most of the related empirical articles (66.7%) use the Questionnaire of Academic Experiences (QVA) or Questionnaire of Academic Experiences - reduced version (QVA-r). Two of them (13.3%) used this instrument together with the Social Skills Inventory and another three (20.0%) with the Student Characterization Questionnaire. It is concluded that interpersonal relationships can favor academic achievement and delay evasion, as well as student support services; and the shortage of the subject in the courses of engineering was verified.

Resumen El inicio de la vida académica es un período de grandes cambios para el estudiante, que muchas veces es tratado de forma infantilizada en la enseñanza secundaria y se depara con las responsabilidades y exigencias de la universidad. En el presente estudio se tuvo como objetivo revisar artículos, publicados entre 2005 y 2015, referentes a la adaptación universitaria relacionada a las vivencias académicas, rendimiento y evasión, en el curso de Ingeniería. Para tanto, se realizaron investigaciones en las siguientes bases de datos electrónicos: Biblioteca Virtual de Salud (BVS), Scielo Brasil y Portal de Periódicos Electrónicos de Psicología (PePSIC). Se utilizaron los descriptores: adaptación académica, vivencias académicas, desempeño académico, evasión e ingeniería. Se encontraron 55 artículos, pero solamente 16 atendieron los criterios de inclusión. La mayor parte de los artículos empíricos relacionados (el 66,7%) utilizan el instrumento Cuestionario de Vivencias Académicas (QVA) o Cuestionario de Vivencias Académicas - versión reducida (QVA-r). Dos de ellos (el 13,3%) utilizaron ese instrumento conjuntamente con el Inventario de Habilidades Sociales y otros tres (el 20,0%) con el Cuestionario de caracterización de los estudiantes. Se concluye que los relacionamientos interpersonales pueden favorecer el rendimiento académico y adiar la evasión, así como los servicios de apoyo a los estudiantes; y se constató la escasez del tema en cuestión en los cursos de ingeniería.