https://repositorio.unifei.edu.br/jspui/handle/123456789/65 2026-06-10T08:02:11Z https://repositorio.unifei.edu.br/jspui/handle/123456789/3173 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/123456789/4435 Aplicação de método multicritério na identificação de abrigos para população afetada por inundações: estudo de caso em Itajubá – MG Many Brazilian cities face recurrent flooding, and in Itajubá, located in southern Minas Gerais within the Sapucaí River Basin, the situation worsens during rainy periods, mainly due to increased soil impermeabilization. Floods cause economic, social, and environmental impacts, and despite historical records, the municipality lacks a comprehensive risk management plan for selecting temporary shelters, which should consider specific strategies, criteria, and subcriteria. Geoprocessing tools are essential for monitoring and evaluating flood-prone areas. This study aimed to analyze criteria for selecting shelter locations in flood-risk areas using geoprocessing and multi-criteria analysis through the AHP method. Flood risk levels were defined, the vulnerable population was characterized, and criteria and subcriteria were hierarchized to support decision-making. The results indicated approximately 35,415 people exposed, exceeding official estimates. Spatial analysis revealed a concentration of shelters in high-susceptibility areas (“Inadequate” or “Low Suitability”). In safe areas, 55 institutions with 12,932 accommodations were identified; in low-suitability areas, 24 institutions with 3,736 accommodations; and in suitable areas, 25 institutions with 5,697 accommodations, while fully suitable areas remain underutilized. The deployment of temporary open-air shelters was limited, with capacity for only 52 people. The hierarchy of criteria highlighted the predominance of physical variables, especially altitude and distance from rivers. The study demonstrates that integrating geoprocessing and multi-criteria analysis allows identification of safe areas, supports shelter allocation, and provides technical guidance for updating contingency plans and public policies, with potential replicability in other municipalities in the basin, contributing to risk reduction and increased population safety in the face of extreme hydrological events. Dissertação 2026-03-12T00:00:00Z https://repositorio.unifei.edu.br/jspui/handle/123456789/4434 O processo de expansão do sistema de transmissão de energia elétrica no Brasil The process of expanding Brazil’s electric power transmission system is divided into four stages: planning, transmission facilities bidding, facility implementation, and the commercial operation of assets. In Brazil, the transmission system expansion plan is under the responsibility of the Ministério de Minas e Energia (MME). The Empresa de Pesquisa Energética (EPE), a state-owned institution subordinated to the MME, prepares electricity planning studies that identify the need to expand the National Interconnected System. It is worth noting that the Operador Nacional de Energia Elétrica (ONS) also assists the MME in this activity through studies for the Expansion and Reinforcement Plan. This process results in the Electric Power Transmission Granting Plan, which defines all facilities to be implemented in the SIN. The Agência Nacional de Energia Elétrica (ANEEL) is the entity responsible for organizing the entire bidding process for the expansions indicated in the POTEE. This process takes place through public auctions held at B3, a financial market infrastructure company. Transmission Agents that win the auctions will be responsible for the full implementation of the awarded facilities, from design through commercial operation, once the facilities are available for ONS operation. All of the above-described processes will be detailed in this dissertation, with the aim of presenting to the academic community a market that plays a significant role in the development of the country’s infrastructure. Dissertação 2026-03-05T00:00:00Z https://repositorio.unifei.edu.br/jspui/handle/123456789/4433 A evolução da qualidade do ar e a relação com a adoção de políticas públicas para controle das emissões veiculares na megacidade do Rio de Janeiro Air quality in Brazilian metropolitan regions has become an increasing challenge due to its impacts on public health, the environment, and urban sustainability. In this context, this dissertation analyzes the evolution of air quality recorded over the last 25 years, between 1998 and 2023, in the Metropolitan Area of Rio de Janeiro (MARJ), focusing on the impacts of the implementation of public policies for vehicular emissions control.. To this end, data from 26 automatic monitoring stations of the State Environmental Institute (INEA) were used, comprising time series of the main atmospheric pollutants (CO, O₃, NO₂, SO₂, PM₁₀, and PM₂.₅). The analysis considered temporal variability, seasonal patterns, spatial distribution of concentrations, and the frequency of exceedances of the standards established by CONAMA Resolution No. 491/2018 and the World Health Organization (2021) guidelines. The methodology included statistical treatment of historical series, identification of extreme events, and integrated analysis between observed concentrations and estimates of vehicular emissions, based on fleet data, fuel consumption, and average emission factors associated with the phases of PROCONVE. The results indicate a consistent reduction in the concentrations of primary pollutants over the analyzed period. CO showed a reduction of approximately 57.9% between 2002 and 2023, with mean values decreasing from about 1.9 ppm to less than 0.8 ppm. NO₂ also showed a significant decline, particularly after 2012, associated with the adoption of vehicle emission control technologies capable of reducing NOx emissions by up to 60% in heavy-duty vehicles. SO₂ showed a marked decrease since the 2000s, in response to the reduction of sulfur content in fuels, from approximately 2,000 ppm in the 1990s to around 10 ppm in the 2010s. In contrast, particulate matter exhibited a more critical behavior. PM₁₀ showed a high frequency of exceedances of the daily standard (100 μg/m³), often exceeding 100 days per year at several monitoring stations. PM₂.₅ presented an even more concerning scenario, with records exceeding 300 days per year above reference values in some locations, indicating chronic population exposure. Ozone (O₃), in turn, remained at elevated levels with recurrent exceedances throughout the historical series, with no clear decreasing trend, reflecting the complexity associated with secondary pollutant formation. From a spatial perspective, critical areas were identified, particularly in Baixada Fluminense, with emphasis on the municipality of Duque de Caxias, characterized by a high frequency of exceedances associated with the combination of vehicular and industrial sources and unfavorable socio-environmental conditions. The comparison between absolute and relative emissions indicates that, although technological advances associated with public policies have significantly reduced the average emission potential of the fleet, the growth in the number of vehicles tends to offset reductions in total emitted loads. This study reinforces the importance of the continuity and improvement of environmental public policies, the integration between technological control and urban planning, and the strengthening of air quality monitoring networks as key instruments to promote sustained improvements in air quality and public health in the RMRJ. Dissertação 2026-03-24T00:00:00Z