Sejam bem-vindos ao Poraquê, o Repositório Institucional (RI) da Universidade Federal do Oeste do Pará (Ufopa). Nosso objetivo é armazenar, preservar, dar acesso e visibilidade à produção científica em formato digital da universidade. O nome Poraquê é uma alusão ao peixe-elétrico da Amazônia, em que seu corpo é capaz de produzir pulsos elétricos, é dito, que enxergar no escuro, logo, possui autonomia energética, capaz de acender uma lâmpada

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    Influência de diferentes substratos no crescimento inicial de porta- enxertos de citros na região do Baixo Amazonas.
    (Universidade Federal do Oeste do Pará, 2026-06-24) SILVA, Matheus Beckham Aquino da; ROSSI, Celeste Queiroz; http://lattes.cnpq.br/4242217997345355; VIEIRA, Dayse Drielly de Souza Santana; http://lattes.cnpq.br/2057759102444626; http://lattes.cnpq.br/9460681161833396; SANTOS, Raudielle Ferreira dos; https://orcid.org/0000-0003-0801-7491; http://lattes.cnpq.br/4820595976291360; ARÉVALO, Michelly Rios; http://lattes.cnpq.br/9084234962228553
    Citrus production is an agricultural activity of great importance to the Brazilian agricultural sector, both in terms of production value and employment and income generation. In the state of Pará, there are two major citrus-producing regions: the northeastern region, characterized by orange production, and the Lower Amazon region, where lime production predominates. In the latter, there is still a lack of studies evaluating techniques and methods that can contribute to increasing productivity, especially for small-scale farmers. Considering this scenario, the present study aimed to evaluate the influence of different substrates on the initial growth of two citrus rootstock cultivars. The experiment was conducted in a greenhouse at the Federal University of Western Pará (UFOPA), Juruti Campus (CJUR), using a completely randomized design (CRD) in a 2 × 5 factorial arrangement, involving two rootstock cultivars (BRS Tabuleiro and BRS Ary S) and five different substrate formulations, totaling 10 treatments with five replications each. The substrate compositions were: soil; soil and cattle manure (4:1); soil and cattle manure (3:1); soil and commercial substrate (4:1); and soil and commercial substrate (3:1). The experimental period lasted 105 days after transplanting the seedlings into polyethylene bags, during which four evaluations were performed. The variables assessed monthly were plant height, stem diameter, and number of leaves. At the end of the experiment, using destructive sampling, the following variables were measured: fresh and dry shoot mass, fresh and dry root mass, leaf area, and Dickson Quality Index (DQI). The collected data were subjected to analysis of variance, and means were compared using the Scott-Knott test at a 5% probability level using SISVAR software. Overall, the results showed that the substrate containing cattle manure at a 4:1 ratio provided the best performance for the evaluated variables, with emphasis on treatment T7 (BRS Ary S + soil + cattle manure at 4:1), which presented the highest values for plant height (57.78 cm), stem diameter (5.98 mm), number of leaves (27.0), and Dickson Quality Index (0.70). In contrast, treatments containing commercial substrate showed the lowest growth performance, with treatment T4 presenting the lowest Dickson Quality Index (0.10). Therefore, the present study confirms the influence of different substrate formulations on the initial growth of citrus seedlings, as well as the interaction between substrate composition and the evaluated genotype. In this context, further studies in the Lower Amazon region are essential to improve seedling production techniques, encourage orchard diversification, and evaluate the performance of these materials under different cultivation and environmental conditions.
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    Influência do tamanho da maniva no crescimento e produtividade de diferentes cultivares de mandioca (manihot esculenta crantz) no Oeste do Pará
    (Universidade Federal do Oeste do Pará, 2026-06-10) PIMENTEL, Manuele Cristina Canto; MELO, Tony Albuquerque de; ROSSI, Celeste Queiroz; http://lattes.cnpq.br/4242217997345355; VIEIRA, Dayse Driely Santana Sousa; http://lattes.cnpq.br/2057759102444626; http://lattes.cnpq.br/0949951002381317; http://lattes.cnpq.br/9276889396447514; PELEJA, Vanessa Leão; http://lattes.cnpq.br/4847354203016902; SILVA, André Alisson Rodrigues da; https://orcid.org/0000-0001-9453-1192; http://lattes.cnpq.br/3573313539974806
    Cassava (Manihot esculenta Crantz) is a perennial plant of the Euphorbiaceae family, cultivated in various regions of Brazil, with the roots being the most widely used part of the plant, yielding various byproducts. Given its social and cultural importance in western Pará, the objective of this study was to evaluate the influence of corm size on the growth and productivity of different cassava cultivars. The experiment was conducted in the Lago Verde community, in the municipality of Juruti, Pará, using a completely randomized design in a 3 × 2 factorial layout, consisting of three cultivars (Coaraci, BRS Mari, and BRS 420) and two cuttings sizes (10 cm and 20 cm), totaling six treatments with twelve replicates. Variables related to sprouting, vegetative growth, root development, harvest index, and estimated yield were evaluated. The results demonstrated that the 20 cm cuttings provided better agronomic performance for certain variables, especially in the BRS Mari and BRS 420 cultivars, resulting in higher estimated yield values. The BRS 420 cultivar stood out with a yield of up to 38,6 t ha-1 using 20 cm corms, while BRS Mari showed a higher harvest index, indicating greater efficiency in directing photoassimilates to the tuberous roots. Nevertheless, it was observed that 10 cm cuttings also exhibited a high sprouting rate and satisfactory performance, indicating potential for use in the vegetative propagation of the crop, especially in systems aimed at making better use of propagative material. Therefore, to achieve higher yields in crops in the region, the use of 20 cm cuttings is recommended. However, the use of 10 cm cuttings also proved viable, yielding satisfactory results in sprouting and growth, and may serve as an alternative for better utilization of propagative material and reduced planting costs, especially under different soil and climate conditions.
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    Desenvolvimento de uma aplicação móvel para o controle de fluxo de caixa
    (Universidade Federal do Oeste do Pará, 2025-08-01) LIBERAL, Lucas Moura; SILVA, Rennan José Maia da; http://lattes.cnpq.br/9809544778631401; http://lattes.cnpq.br/8566110194605053; PONTE, Márcio José Moutinho da; https://orcid.org/0000-0002-0724-3721; http://lattes.cnpq.br/4760076685971693; SILVA, Bruno Almeida da; https://orcid.org/0000-0003-0201-8047; http://lattes.cnpq.br/6546161789589212
    Efficient cash flow management is essential for the financial sustainability of individuals and organizations. This paper presents the development stages of a mobile system for cash flow control. The application allows users to create and filter financial entries by period, providing an intuitive and responsive interface. The system was developed using React Native for the front-end and Node.js with Express for the back-end API, while the relational database MySQL was used for data storage. The adopted methodology involved prototyping and the application of the MVC (Model, View, Controller) architecture to ensure modularity and scalability. The conducted tests demonstrated that the developed solution meets the proposed requirements.
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    +Quilombo digital: estudo de caso sobre inclusão de jovens quilombolas no setor tecnológico.
    (Universidade Federal do Oeste do Pará, 2025-06-02) SANTOS, Caio Lima dos; SILVA, Bruno Almeida da; https://orcid.org/0000-0003-0201-8047; http://lattes.cnpq.br/6546161789589212; http://lattes.cnpq.br/8219284939835304; RODRIGUES JÚNIOR, Raimundo Augusto Rego; https://orcid.org/0000-0003-2454-5622; http://lattes.cnpq.br/0530700765360178; SILVA, Rennan José Maia da; http://lattes.cnpq.br/9809544778631401
    This research is the result of the university extension project “+ Quilombo Digital,” which aimed to promote digital and social inclusion for quilombola youth by training them in computer maintenance and programming, with the goal of increasing their employability prospects. The project was carried out in the Quilombo Bom Jardim Community, located in the Santarém Plateau region, and involved both practical and theoretical activities focused on solving local problems, with an emphasis on the use of technologies such as Scratch. The methodology adopted included hands-on practices and a Project-Based Learning (PBL) approach, enabling participants to develop practical skills such as disassembling and assembling computers, as well as basic programming knowledge. The combination of theoretical and practical instruction was essential for learning, despite the limitations in resources and equipment. The results showed a positive outlook, with participants demonstrating great interest and commitment, despite the challenges faced, such as equipment shortages and dropout during vacation periods. Most participants displayed a good understanding of software and hardware concepts and showed increasing interest in pursuing a career in the technology sector, highlighting the project’s impact on transforming their professional and personal paths. Therefore, this project not only contributes to reducing socioeconomic inequalities but also strengthens the inclusion of quilombola communities in the digital context, preparing young people for a future in which technological skills are increasingly valued.
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    Lei de Titius-Bode: uma atividade prática sob a ótica da teoria das situações didátcas
    (Universidade Federal do Oeste do Pará, 2026-08-27) JESUS, Krisna Rejane Silva de; Hamilton Cunha de Carvalho; Valdomiro Pinheiro Teixeira Junior; Rudinei Alves dos Santos
    This monograph aims to analyze the perceptions of undergraduate Mathematics students expressed in an activity addressing the Titius-Bode Law from the perspective of the Theory of Didactical Situations (TDS). The activity was carried out with 48 students enrolled in the Mathematics degree program at the Federal University of Western Pará (UFOPA). The activity consisted of presenting the Titius-Bode Law, a mathematical model based on a geometric progression to determine the positions of the planets in the Solar System. The analysis of the data, collected through evaluation forms completed by the undergraduate students and through our personal records, revealed that the experience provided not only the active construction of scientific concepts, but also fostered a critical and reflective attitude toward the mathematical laws that govern physical phenomena through a contextualized didactical situation.