https://repositorio.uema.br/jspui/handle/123456789/2014 Fri, 17 Apr 2026 09:28:47 GMT 2026-04-17T09:28:47Z https://repositorio.uema.br/jspui/handle/123456789/5998 Título: Eletrodeposição e caracterização de revestimentos de Ni-In obtidos a partir de solvente eutético profundo aplicados para eletrocatálise de reações de evolução de hidrogênio Abstact: The present work aimed to electrodeposit and characterize Nickel-Indium (Ni-In) coatings obtained from Deep Eutectic Solvents (DES) for application in electrocatalysis of hydrogen evolution reactions (HER). The research seeks to contribute to the development of alternative and sustainable materials for the production of green hydrogen, a clean and renewable energy source. The methodology included the preparation of electrolytes based on choline chloride and urea (1ChCl:2U), electrodeposition on copper substrates, morphological, chemical, and electrochemical characterization of the coatings, as well as tests of electrocatalytic efficiency in 1M KOH solution. The Ni-In coatings exhibited morphological characteristics that were sensitive to the In content, varying from smoother, granular to more compact layers, favoring high electrocatalytic activity. The results showed that the Ni-In alloys significantly reduced the overpotential required for hydrogen evolution, proving to be more efficient compared to pure copper substrates. Therefore, the proposed methodology is promising for the production of lowcost, high-performance catalysts, offering a viable alternative to the use of noble metals such as platinum. This work reinforces the relevance of DES in the synthesis of metallic coatings and paves the way for future research in the field of sustainable energy transitio Tue, 15 Jul 2025 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/5998 2025-07-15T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/5997 Título: Explorando as potencialidades das simulações computacionais no ensino de Física: uma análise dos benefícios para alunos e professores Abstact: The advancement of digital technologies has impacted education by expanding the possibilities for pedagogical mediation and offering resources that make teaching more dynamic and interactive. In Physics education, these transformations are particularly relevant due to the abstract nature of the content, which requires more contextualized methodologies. This study aims to analyze the potential of computational simulations in Physics teaching, investigating their benefits and implementation challenges. To achieve this purpose, the study seeks to understand how these tools contribute to learning, how they are used in schools, and which limitations interfere with their effective use. The theoretical framework addresses Digital Information and Communication Technologies (DICTs), the challenges of Physics education, and the role of simulations, highlighting platforms such as PhET Colorado, Algodoo, Modellus, and GeoGebra. The research adopts a descriptive quantitative approach, based on a literature review and field research conducted in Caxias–MA, involving twelve teachers with degrees in Physics. The results show that teachers are familiar with these platforms and recognize their benefits for student engagement and understanding, although their use is still limited by infrastructure constraints, technical proficiency, and methodological issues. It is concluded that computational simulations are relevant and promising pedagogical tools for Physics education, provided they are accompanied by improved structural conditions and continuous teacher training Wed, 01 Jan 2025 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/5997 2025-01-01T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/5996 Título: Fontes de energia limpa: uma análise dos fenômenos físicos e das potencialidades da energia solar, eólica e do hidrogênio verde Abstact: This study addresses clean energy sources, with emphasis on solar energy, wind energy, and green hydrogen. The main objective is to understand the physical principles that enable energy generation from these resources and to discuss their relevance in the context of the energy transition and the search for sustainable solutions. The research will be developed through a literature review, covering physical concepts related to the photoelectric effect, the conversion of wind kinetic energy into electricity, and the electrolysis processes used to obtain hydrogen. The study aims to demonstrate the feasibility and benefits of these technologies compared to traditional sources, highlighting their contribution to reducing greenhouse gas emissions and diversifying the energy matrix. Clean energy sources stand out as essential alternatives to reduce dependence on fossil fuels and minimize environmental impacts. Solar energy harnesses the Sun’s radiation, which can be converted into electricity through photovoltaic panels or used for heating in thermal systems. Wind energy exploits the force of the wind to drive turbines connected to generators, transforming the kinetic energy of the air into electricity sustainably. Green hydrogen is obtained through the electrolysis of water using renewable sources, resulting in a clean fuel that releases only water vapor when used. These alternatives, in addition to being renewable and abundant, represent promising paths for energy diversification and for addressing climate change Wed, 14 Jan 2026 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/5996 2026-01-14T00:00:00Z https://repositorio.uema.br/jspui/handle/123456789/5995 Título: Sistemas de proteção contra descargas atmosféricas (SPDA) em estruturas metálicas Abstact: Lightning discharges are natural phenomena with high destructive potential, capable of causing structural damage, failures in electrical and electronic systems, service interruptions and serious risks to human life. In tropical countries such as Brazil, where lightning incidence is among the highest in the world, the adoption of efficient Lightning Protection Systems (LPS) is essential, especially in buildings with metallic structures. This study aims to evaluate the effectiveness of LPS applied to metallic structures, based on the technical criteria established by ABNT NBR 5419:2015. The methodology consisted of a systematized literature review, including scientific articles, technical standards, books, theses and dissertations published between 2003 and 2025. The analysis focused on risk assessment, protection levels, grounding systems, equipotential bonding, inspection and maintenance procedures. The results indicate that the effectiveness of LPS is directly related to the correct definition of the protection level, proper design of its components and periodic inspections. The strict application of technical standards, combined with knowledge of electrostatic principles, is essential to mitigate the effects of lightning strikes, ensuring the protection of human life, structural integrity and operational continuity of buildings Wed, 14 Jan 2026 00:00:00 GMT https://repositorio.uema.br/jspui/handle/123456789/5995 2026-01-14T00:00:00Z