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Recent Submissions

Desempenho do motor de um trator agrícola sob diferentes concentrações de biodiesel de soja
(Universidade Estadual de Goiás, 2022-10-29)
Gomes, Felipe Alves
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http://lattes.cnpq.br/9877292121215389
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Reis, Elton Fialho dos
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http://lattes.cnpq.br/9877292121215389
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Reis, Elton Fialho dos
The objective of this work was to evaluate the engine performance of an agricultural tractor subjected to different concentrations of biodiesel. The experiment was carried out at the Agricultural Engineering’s Laboratory of Universidade Estadual de Goiás, at Câmpus Central Sede Anápolis de Ciências Exatas e Tecnológicas. Dynamometric tests were performed, through the power take-off, on a New Holland model TT4030 agricultural tractor. The experiment was conducted in a completely randomized design, in a 5x7 factorial treatment scheme, in subdivided plots, with plots consisting of five concentrations of biodiesel (B10, B25, B50, B75, B100) and subplots consisting of seven engine rotations (1200, 1360, 1600, 1840, 2090, 2330, 2490 rpm), with three repetitions per treatment. The tests were conducted in accordance with the Organization for Economic Cooperation and Development - code 2. The following variables were determined: torque, power, hourly and specific fuel consumption and temperature of the exhaust gases. The fuels caused changes in the performance of the engine, the intermediate concentrations (B25, B50 and B75) did not provide significant losses of torque and power, a difference evidenced only with the use of pure biodiesel, the increase in the rotation and concentration of biodiesel in the mixture provided increase in hourly consumption, specific consumption and temperature of the exhaust gases. The B25 concentration can partially replace diesel oil, without significant losses in engine performance.
Atributos químicos em solo sob deposição de resíduos sólidos urbanos no município de Jaraguá-Goiás
(Universidade Estadual de Goiás, 2020-08-31)
Félix, Robson de Oliveira
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Teixeira, Gisele Carneiro da Silva
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http://lattes.cnpq.br/2937628248163067
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http://lattes.cnpq.br/1570360310163590
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Teixeira, Gisele Carneiro da Silva
The proper destination of Municipal Solid Waste (MSW) has been the subject of numerous discussions, not only among scholars in the area, but also in public policies, seeking ways that can reduce the environmental impacts arising from the bad final destination of this waste, which affect not only the soils where they are deposited, as well as they can contaminate surface and underground waters, being agents of pollution of the environment, affecting quality of life and health of the people under its influence. Thus, the objective of this research was to evaluate the physical-chemical characteristics of the soil, and possible contamination by polluting metals in a final destination of Municipal Solid Waste in the city of Jaraguá- Goiás. The sampling arrangement was defined in a 3x3 scheme, with three soil coverings (L - dump, M - upstream, J - downstream) and three depths (2, 4 and 6m). The following physical- chemical parameters of the soil were evaluated: texture, pH, organic matter, CTC, Ca, Mg, P, K and the polluting metals (Cd, Pb, Cu, Cr, Fe, Mn, Zn). The data were submitted to descriptive statistical analysis, principal component analysis (PCA) and cluster analysis by dendogram, using Microsoft Office Excel® and R software, for the described variables. The results indicated that the samples from the MSW deposition site analyzed are not contaminated, considering the limits established by CONAMA, CETESB and COPAM, however, these values showed a significant difference between the samples from the landfill compared to the samples upstream and downstream of the same. Parameters such as Ca, Mg, K, Fe, Cr, Cu, Mn and pH were significant in the landfill samples, while Pb, P and Zn obtained higher levels in the upstream points. It is concluded that, despite not reaching the established limits, the data demonstrate that the soils in the landfill region showed physical- chemical characteristics that indicate a trend of soil contamination under the influence of the deposition of Municipal Solid Waste (MSW).
Algoritmo floresta aleatória e estatística multivariada utilizados para classificação do estádio de maturação de cagaitas (Eugenia Dysenterica)
(Universidade Estadual de Goiás, 2025-05-13)
Bastos, César Roberto Pereira
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Melo, Francisco Ramos de
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https://orcid.org/0000-0001-9490-9386
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http://lattes.cnpq.br/5142938603640739
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https://orcid.org/0009-0006-2458-1382
The Cerrado biome, due to its vast territorial extent and high biological diversity, plays a strategic role in both food security and biodiversity conservation in Brazil. Covering approximately 24% of the national territory, this ecosystem contributes significantly to Brazilian agricultural and livestock production. However, increasing human interventions have threatened the region’s ecological balance, making the monitoring and preservation of native species essential. Eugenia dysenterica, commonly known as cagaita, is an endemic fruit of the Cerrado with commercial potential, yet it poses postharvest conservation challenges due to the delicate texture of its pulp. In this context, the present study aimed to classify the different maturation stages of cagaita based on physical, physicochemical, and chemical attributes, in order to determine the optimal harvest point and support large-scale commercialization. The variables analyzed included weight, diameter (transverse and longitudinal), surface area, color (lightness, hue angle, and chroma), firmness (peel and pulp), soluble solids, pH, titratable acidity, and maturation index. Data were collected using a completely randomized design (CRD) with one factor — days after anthesis (DAA) — comprising five treatments (28, 31, 34, 37, and 40 DAA), with 40 replications and three fruits per experimental unit. Statistical analyses involved multivariate methods (cluster analysis and principal component analysis) and the random forest algorithm, known for its ability to handle complex classification problems. Principal component analysis identified the most relevant variables for differentiating maturation stages, while cluster analysis revealed the formation of three distinct groups based on DAA. The random forest model showed satisfactory performance, with balanced metrics of precision, recall, and F1-score, as well as a Matthews correlation coefficient (MCC) of 0.62. These findings demonstrate the potential of integrating multivariate statistics and machine learning for the characterization of native fruits, providing valuable insights for improving harvest, handling, and processing practices in Cerrado fruit farming.
Conservação da qualidade pós-colheita de cajá-manga tratada sob diferentes condições de cloreto de cálcio e ácido cítrico
(Universidade Estadual de Goiás, 2022-11-18)
Freire, Eliane da Costa
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Ascheri, Diego Palmiro Ramirez
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Ascheri, Diego Palmiro Ramirez
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Pereira, Luciane Dias
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Signini, Roberta
The cajá-manga (Spondias dulcis) fruit has significant social and economic importance, but its post-harvest shelf life is limited, affecting its commercialization. This study aimed to evaluate This study investigated the post-harvest quality preservation of cajá-manga fruit treated with different concentrations of calcium chloride and citric acid. The fruits were acquired from Vinícola Jaboticabal, located in Hidrolândia-GO, in April 2021. Two experiments were conducted: the first evaluated different concentrations of calcium chloride (0, 1, 2, 3, and 4%), and the second, concentrations of citric acid (0, 1, 2, 3, and 4%), aiming to analyze their effects on quality parameters such as pH, soluble solids, mass loss, vitamin C, and pulp and peel firmness. The experimental design was completely randomized in a 5 x 8 factorial scheme, with four replications of two fruits each, totaling 360 fruits. Statistical analysis was performed using Sivar 5.6 and Origin Pro 8 software. The results showed similar behaviors in both experiments in variables such as soluble solids, titratable acidity, maturation index, and vitamin C. It was found that the concentration of 2% calcium chloride and 1% or 3% citric acid presented the best responses, evidenced by less mass loss, higher vitamin C content, higher titratable acidity, higher soluble solids content, and more suitable coloration.
Trilha do tatu: visitas mediadas como estratégia para a educação científica e a sensibilização ambiental sobre a biodiversidade do cerrado
(Universidade Estadual de Goiás, 2026-06-12)
Lima, Cléver Marcelo Teixeira de
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http://lattes.cnpq.br/4037739389334742
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Ferreira, Juliana Simião
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http://lattes.cnpq.br/4911313788857496
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Santos, Mirley Luciene dos
This study investigates the contributions of guided visits to the Tatu Ecological Trail, a non formal educational environment, to scientific education and environmental awareness regarding the biodiversity of the Brazilian Cerrado. Located in the Ecological Reserve of the State University of Goiás (UEG), in Anápolis, Goiás, Brazil, the trail is under stood as a complementary pedagogical space that integrates theory and practice through educational mediation. Grounded in the socio interactionist perspective, the research is based on the assumption that learning is constructed through social interactions, maki ng non formal educational spaces privileged environments for the development of contextualized and meaningful knowledge. The study aimed to evaluate the mediation strategies employed during guided visits involving 38 ninth grade elementary school stu dents. The methodological procedures included pre and post visit questionnaires, participant observation, photographic records, and the Spontaneous Recall and Stimulated Recall techniques, applied 30 and 120 days after the visit to investigate the permanence an d reinterpretation of learning over time. Data were qualitatively analyzed according to the categories proposed by Allen (2002): Perception, Concepts, Connection, and Affective. The results revealed an expansion and consolidation of knowledge about t he bio diversity of the Cerrado, increased environmental awareness, and a stronger emotional connection between the students and the biome, as well as the retention of meaningful learning resulting from the guided experiences. As an educational product, the Tatu Ecological Trail Educational Guide was developed to support teachers and environmental educators in the pedagogical use of this educational space. The guide was validated in a real educational context with the trail monitors through participant obser vation , demonstrating its pedagogical applicability, its contribution to educational mediation, the organization of guided visits, and the strengthening of the relationship between the university, schools, and the local community. The findings indicate that guid ed visits constitute an effective strategy for promoting scientific education and environmental awareness in non formal educational settings.