PPGEM https://repositorio.ufpb.br/jspui/handle/tede/4458 2026-05-18T15:12:06Z 2026-05-18T15:12:06Z Schultz, Herwin Saito https://repositorio.ufpb.br/jspui/handle/123456789/38096 2026-05-18T06:07:51Z 2026-02-27T00:00:00Z

Título: Desempenho termodinâmico, ambiental e social de colheita de energia a partir de atividades físicas Autor(es): Schultz, Herwin Saito Orientador: Carvalho, Monica Abstract: An Energy Harvesting System (EHS) based on physical exercise can address issues of energy sustainability and public health. Greener&Healthier Power (GHP) is an EHS that features a conceptual innovation: a training app with automatic intensity selection, simulating situations closer to the reality of outdoor exercise, and also controlling environmental parameters. The idea behind GHP is to encourage physical activity, reducing the risk of developing Non-Communicable Chronic Diseases (NCDs) and potentially contributing to lower public health costs. Based on an Energy Harvesting Farm (EHF) composed of 32 stationary bicycles responsible for collecting energy and supplying it to the grid, this study aims to develop a technical analysis and evaluate the thermodynamic, environmental, and social performance of EHF. Life Cycle Assessment (LCA) is used to quantify the Greenhouse Gases (GHG) emissions associated with the EHF composition. The results reveal that a cyclist in one hour can generate an average of 75.5 Wh, that an EHF has a capacity of 8,167.9 kWh/year, and that its emission factor is 0.090 kg CO2-eq/kWh, significantly lower than that of the Brazilian national electricity grid (0.152 kg CO2- eq/kWh). For an investment of R$ 208 million, the estimated reduction in public health costs ranged from R$ 532 million to R$ 2.91 billion. Therefore, it can be concluded that the GHP is an interactive and connected system capable of harvesting energy from indoor cycling, reducing the carbon footprint, improving the population's quality of life, and with the potential to reduce public health costs. Editor: Universidade Federal da Paraíba Tipo: Tese

2026-02-27T00:00:00Z Silva, Danielle Apolinário da https://repositorio.ufpb.br/jspui/handle/123456789/38087 2026-05-18T06:07:18Z 2021-11-29T00:00:00Z

Título: Estratégias de produção através do Indicador de Potencial de Produtividade Autor(es): Silva, Danielle Apolinário da Orientador: Santos, Moisés Dantas dos Abstract: Oil reservoir management is a very complex task in the field of reservoir engineering. The physical parameters, economic constraints and operational conditions directly interfere in the process of defining the best production strategies. In view of this difficulty, this paper proposes a methodology to define a best strategy that identifies wells with higher production in points of maximum proximity, in Hydraulic Flow Units (HFUs), through the Productivity Potential Indicator (PPI) associated with the reservoir Productivity Map, in order to estimate the optimal location for the adequate positioning of wells and avoid exhaustive simulations, being an efficient strategy for the development of an oil field. The case study is based on the UNISIM-I-D synthetic reservoir model of an offshore oil field, with characteristics similar to the Namorado Field, located in the Campos Basin, Brazil. The results obtained were presented from the prediction of accumulated oil production through IPP, without and with the help of the Productivity Map, from cases performed in the Computer Modelling Group Ltd (CMG) suite. In the cases analyzed within the Productivity Map, the lowest IPP indicated the highest accumulated oil production, thus indicating the largest producing well among the wells analyzed in the reservoir. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2021-11-29T00:00:00Z Silva, David Domingos Soares da https://repositorio.ufpb.br/jspui/handle/123456789/37895 2026-04-02T06:07:14Z 2020-04-14T00:00:00Z

Título: Evaluation of the sigma phase precipitation in duplex stainless steel by nondestructive testing Autor(es): Silva, David Domingos Soares da Orientador: Gomes, Rodinei Medeiros Abstract: Duplex stainless steels (DSS) have a structure composed of α-Fe and γ-Fe in approximately equal volume fractions. Which provides an excellent integration between mechanical properties and corrosion resistance. However, the precipitation of sigma (σ) phase may cause a severe deterioration of these properties, phenomenon known as sigma phase embrittlement. In the present work, the effect of the isothermal aging treatment at 800 °C (temperature in which σ phase can be formed) on metallurgical, corrosion, magnetic and mechanical properties on DSS UNS S31803 was investigated. In addition, two new nondestructive methods for monitoring of sigma phase embrittlement in DSS were proposed and evaluated. The first method is based on the electromechanical impedance (EMI), using piezoelectric sensors. The basic idea of this method is that the increase mechanical stiffness, due to sigma phase embrittlement, will leads to the variation in the EMI signatures. The second method, designated as low-fields magnetic analysis (LFMA) is based on the measurement of magnetic flux density. Once the precipitation of σ phase cause a change in the volume fraction of α-Fe/γ-Fe phases due to α-Fe (ferromagnetic phase) decomposition to precipitate σ (paramagnetic phase). The evaluated techniques present accurate results with high sensitivity and reliability. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2020-04-14T00:00:00Z Sousa, Anderson Aldelyan Ramalho de https://repositorio.ufpb.br/jspui/handle/123456789/37422 2026-01-27T06:05:48Z 2025-03-31T00:00:00Z

Título: Caracterização físico-quimíca do bio-óleo obtido da pirólise do lodo da estação de tratamento de esgoto Autor(es): Sousa, Anderson Aldelyan Ramalho de Orientador: Gomes, Kelly Cristiane Abstract: The Sewage sludge generated in Wastewater Treatment Plants (WWTPs) represents a significant environmental challenge. Pyrolysis emerges as a promising alternative for converting this waste into bio-oil, with energetic potential and industrial applications. This study aimed to evaluate the technical and environmental feasibility of bio-oil obtained from the pyrolysis of sludge generated in WWTPs in Paraíba, Brazil, as a sustainable energy source and industrial raw material. To this end, bio-oil samples obtained from the pyrolysis of sludge from the WWTPs of João Pessoa and Campina Grande, as well as a mixture of both, were analyzed through physicochemical characterizations, thermal stability, and higher heating value (HHV). In addition, a bibliometric and systematic review was conducted to map the scientific production on the subject and identify knowledge gaps. The results showed that the samples exhibit characteristics compatible with liquid fuels, with HHV ranging from 40.09 to 41.50 MJ/kg. Infrared spectroscopy revealed the presence of phenolic compounds and hydrocarbons, contributing to the energy performance. Thermal analyses indicated stability and good performance under different atmospheres. It is concluded that sludge pyrolysis from WWTPs is a viable alternative for energy recovery, contributing to sustainability and environmental management. Editor: Universidade Federal da Paraíba Tipo: Dissertação

2025-03-31T00:00:00Z