https://repositorio.unifei.edu.br/jspui/handle/123456789/55 2026-06-19T09:44:35Z 2026-06-19T09:44:35Z https://repositorio.unifei.edu.br/jspui/handle/123456789/3173 2024-02-05T10:36:02Z 2022-02-17T00:00:00Z

Aquisição e validação de sinal de ruído eletroquímico Corrosion is a global problem, which implies costs in industrialized countries of up to 4.5% of GDP, with either economic, but also social and environmental impacts. In the case of Brazil, the waste of water supply networks due to leaks loss is quite significant and much of it is caused by network degradation, indicating that corrosion control should be promoted whenever possible. This study proposes a corrosion monitoring system, in system subject to the use of inhibitor, with the approach of passive technique for monitoring corrosion by electrochemical noise (EN), in which the classification of events in a corrosion sensor by EN is part of methodological study for structural integrity (or “health”) monitoring system (SHM). Due to very dynamic and stochastic nature of the signal, this study and analysis of EN measurements (ENM) considers numerical and graphic characteristics of two corrosion systems both in saline aqueous solution: carbon steel and stainless steel. These experiments are repeated for accumulating data, which allow the generation of several graphs in time and frequency domains, from which at least one characteristic is extracted, which has a good correlation with data from corrosion processes. Then, based on a supervised machine learning system, the training data allows the model to be calibrated. From the test data, the correctness rate of the model above 50% is verified. Dissertação

2022-02-17T00:00:00Z https://repositorio.unifei.edu.br/jspui/handle/123456789/4446 2026-06-18T13:40:14Z 2026-04-10T00:00:00Z

Formação inicial de professores em ciências da natureza: perspectivas de inclusão escolar em projetos pedagógicos de cursos This study aimed to analyze how the theme of school inclusion is addressed in the Pedagogical Course Projects (PPC) of undergraduate courses in Natural Sciences and what understandings can be constructed from the guiding documents of these courses. To this end, documentary research was carried out, based on the analysis of PPC that were selected according to their classification in the 2021 ENADE (National Student Performance Exam), considering the evaluative extract referring to unsatisfactory, satisfactory, and high-quality performance. The investigation adopted a qualitative approach, with data analysis guided by the path proposed by Robert Yin. For theoretical grounding, authors who discuss teacher training, curriculum, and inclusion were consulted, among whom Nóvoa (1992), Tardif (2020), Imbernón (2006), Sassaki (1997), Mantoan (2003), Diniz (2007), Mendes (2017), Arroyo (2013), Gimeno Sacristán (2000/2013), and others stand out. The results indicate weaknesses in the approach to school inclusion as expressed in the PPC (Pedagogical Project of the Course), especially regarding the legal basis and the proposition of effective practices aimed at inclusive education. Data analysis showed that courses offered by federal institutions present more systematized perspectives on inclusion when compared to those offered by private, state, and municipal institutions. It was also evident that institutions with inclusion support centers tend to present more structured inclusive pedagogical perspectives. Finally, this study revealed tensions between teacher training, curriculum, the institutionalization of inclusive policies, and the concept of collective responsibility in promoting school inclusion. Dissertação

2026-04-10T00:00:00Z https://repositorio.unifei.edu.br/jspui/handle/123456789/4445 2026-06-17T18:27:41Z 2026-02-20T00:00:00Z

Uma perspectiva numérica para a evolução do contraste de densidade em modelos cosmológicos intrinsecamente homogêneos e isotrópicos The standard model of Cosmology, often called ΛCDM, is not able to explain some of the recent observational results. In this context, it becomes necessary to seek new approaches that are able to explain the dynamics of the Universe. Thus, we will numerically study a cosmological model with homogeneous and isotropic expansion through its Einstein equations, which in this case is expressed in a partial differential equation (PDE) of the nonlinear diffusion type. In particular, we will examine the temporal evolution of the density contrast, which provides us with important information about the evolution of inhomogeneities of the cosmological fluid. Dissertação

2026-02-20T00:00:00Z https://repositorio.unifei.edu.br/jspui/handle/123456789/4444 2026-06-17T13:28:56Z 2026-03-05T00:00:00Z

Desenvolvimento social e direitos trabalhistas: a realidade dos catadores de materiais recicláveis This dissertation examines the activities of recyclable material pickers within the context of social development, Brazil’s National Solid Waste Policy, and reverse logistics, focusing on the municipality of Itajubá, Minas Gerais. Situated within the contemporary debate on sustainability and social justice, the study highlights the essential role played by these workers in the management of urban solid waste, in contrast to the persistent precariousness of their working conditions and the insufficiency of legal and social protection. The research is guided by the following questions: what is the factual situation experienced by recycling workers in the municipality of Itajubá–MG? Do these workers maintain any form of employment relationship with local associations? Which public policies could be implemented to ensure social protection compatible with the environmental, economic, and social relevance of their work? The general objective is to analyze the working conditions of recyclable material pickers in order to assess the legal classification of their activity. The specific objectives are: to understand, through field research, the daily practices of these workers and the main challenges they face; to examine whether their activity may be framed within the labor categories provided for under Brazilian labor legislation; and to propose public policies aimed at expanding their social protection, in alignment with the Sustainable Development Goals (SDGs) No. 8 (Decent Work and Economic Growth), No. 10 (Reduced Inequalities), No. 11 (Sustainable Cities and Communities), and No. 12 (Responsible Consumption and Production). Methodologically, the study adopts a qualitative-descriptive approach, based on semi-structured interviews, combined with bibliographic review and analysis of legal instruments and scientific literature. The findings indicate that, although these workers play a fundamental role in reverse logistics and in advancing environmental agendas, their activities are predominantly carried out under conditions of informality, precariousness, and social vulnerability. In the investigated context, it was found that recyclable material pickers generally do not maintain formal employment relationships with local associations and are classified as self-employed workers, which limits their effective access to labor rights and social security. Furthermore, the study shows that waste picking is not a transitional activity but rather a long-term survival strategy, characterized by extended work trajectories, exposure to health risks, economic instability, and dependence on intermediaries for the commercialization of recyclable materials. The research reveals a structural contradiction between environmental sustainability discourses and the social reality of these workers, who remain largely invisible despite their significant contribution to reinserting materials into productive chains. The analysis of the Sustainable Development Goals indicates a disconnect between progress in environmental agendas and the effective promotion of social rights, such as decent work and the reduction of inequalities. Finally, the study proposes the implementation of public policies focused on fair remuneration for the environmental services provided, the development of adequate infrastructure for the activity, the establishment of worker health policies integrated into the public health system, and the promotion of institutional recognition, environmental education, and participation of these workers in municipal decision-making processes, as essential measures to overcome the cycle of invisibility and social exclusion. Dissertação

2026-03-05T00:00:00Z