Biblioteca Digital de Teses e Dissertações. https://repositorio.ufra.edu.br/jspui/handle/123456789/16 2026-11-08T01:25:25Z 2026-11-08T01:25:25Z MIRANDA, Andréa da Silva https://repositorio.ufra.edu.br/jspui/handle/riufra/2952 2026-10-22T12:52:49Z 2026-01-01T00:00:00Z

Título: Modelo de Acessibilidade em Telecentros Autor(es): MIRANDA, Andréa da Silva Abstract: The use of information technology grows day by day, as well as its byproducts in all activities of society. However, whether by the high cost or the difficult access, technologies serve only a small part of the population while people with special needs do not have the same chances. In an attempt to reduce these difficulties, this work presents a model of accessibility to be applied in TELECENTERS. This model was developed from the identification of factors related to access and use that make difficult or prevent the interaction human and computer for People with Special Needs. It was built in Taguatinga - DF, supported by the ministry of labor, a standard TELECENTER that results from the collection and analyses of documents and records produced during the appointment process. The basic model presented in this document focuses on two aspects: the appointment plus a registration and a physical and digital access. In order to make easy the necessary processes that achieve these goals, it was developed a "Support computing System for an Accessible Telecenter" (SSAT). From the data recorded and analyzed in SSAT, it could be done a more efficient and effective intersection of information for a decisionmaking regarding the use of technology and other necessary guiding to the appointment process. The collected and evaluated data served as an input to develop specific methodologies for the appointment of people with disabilities in telecenters. An accessible Telecenter will allow, at an intermediate term, that a great part of people with disabilities can plenty enjoy the benefits offered by information technology, such as access to work, education, culture, leisure, to research and information, besides enhancing the generation of work and income

2026-01-01T00:00:00Z BATISTA, Enza Cruz https://repositorio.ufra.edu.br/jspui/handle/riufra/2949 2026-10-19T22:28:28Z 2026-01-01T00:00:00Z

Título: Boro e potássio em mudas de açaizeiro: crescimento, trocas gasosas e diagnose visual Autor(es): BATISTA, Enza Cruz Abstract: In recent decades, the cultivation of the açaí palm (Euterpe oleracea Mart.) has gained significant economic importance in Northern Brazil; however, information regarding its nutritional management remains scarce. B stands out as one of the most common nutrient deficiencies in this crop, playing a key role in cell wall formation and stabilization, with direct impacts on plant growth. K, in turn, acts in osmotic control, stomatal regulation, and cellular metabolism. This study aimed to evaluate the physiological and morphological responses, biomass accumulation, and visual symptoms of deficiency and toxicity in açaí palm seedlings subjected to varying doses of B and K. The experiment was conducted in a greenhouse from November 2024 to May 2025 at the Federal Rural University of the Amazon (UFRA), Belém campus, Pará state, Brazil. Plants were grown individually in 8 L pots containing a medium textured, low-fertility Yellow Oxisol (Xanthic Ferralsol) substrate, with base saturation adjusted to 60%. A completely randomized design (CRD) was adopted in a 4 × 4 factorial scheme. The nutrient sources used were potassium chloride (KCl, 60% K2O) and disodium octaborate / pentahydrate tetraborate (Granubor, 15% B) at doses of 0.1 (K0), 0.2 (K1), 0.3 (K2), and 0.4 g dm−3 (K3) of K, and 0 (B0), 0.001 (B1), 0.002 (B2), and 0.003 g dm−3 (B3) of B. Analysis of variance revealed no significant interaction (𝑝 > 0.05) between B and K for any of the evaluated variables. K significantly influenced gas exchange, promoting linear reductions in net CO2 assimilation rate (𝐴), stomatal conductance (𝑔𝑠), and transpiration rate (𝐸). Conversely, B exerted a significant quadratic effect on the intercellular-to-ambient CO2 concentration ratio (𝐶𝑖/𝐶𝑎), collar circumference (CC), root dry mass (RDM), and root volume (RV). The technical optimal B dose for CC was 0.0012 g dm−3 , whereas for RDM and RV it was 0.0013 g dm−3—the same dose at which the 𝐶𝑖/𝐶𝑎 ratio reached its minimum point. The sharp decline observed in these variables at higher doses demonstrated that excess B is more detrimental to growth than B omission itself. Visual diagnosis allowed the characterization of distinct symptoms: B deficiency caused crinkled leaves, leaflets fused in a "fishbone" pattern, stipe cracking, as well as root apical thickening and necrosis. K deficiency manifested in older leaves as marginal chlorosis and necrosis, premature defoliation, and susceptibility to whitefly. Excess B induced marginal chlorosis and scorching on older leaves, whereas excess K caused chlorosis and necrotic lesions. Careful management of B and K fertilization is required during seedling production due to the high sensitivity of the species to B and the risk of osmotic stress induced by high doses of KCl. Further studies are recommended to understand the nutritional requirements of the açaí palm across different phenological stages.

2026-01-01T00:00:00Z VIEIRA, Luana Rodrigues https://repositorio.ufra.edu.br/jspui/handle/riufra/2948 2026-10-19T22:02:47Z 2026-10-13T00:00:00Z

Título: Influência de diferentes arranjos agroflorestais com cacau sobre a serapilheira e a fertilidade do solo na Amazônia oriental. Autor(es): VIEIRA, Luana Rodrigues Abstract: The Amazon biome harbors high biodiversity and naturally nutrient-poor soils, whose fertility depends strongly on nutrient cycling driven by litter dynamics. In degraded areas or areas converted to agriculture, secondary forests and agroforestry systems (AFSs) have emerged as sustainable alternatives for reconciling agricultural production with environmental conservation. In Tomé-Açu, Pará State, a municipality characterized by a history of intensive agricultural practices and the expansion of agroforestry systems, understanding how these systems affect soil properties and litter physical attributes is particularly relevant. This study aimed to evaluate litter stock, waterholding capacity (WHC), and soil fertility attributes in four cocoa-based agroforestry systems (AFSs) containing Theobroma cacao L., with different species compositions and ages, compared with a secondary forest (FLO) used as a reference ecosystem. Five plots were established in each ecosystem for litter and soil sampling. Litter was separated into non-woody, woody, and miscellaneous fractions to determine litter stock and water-holding capacity. Samples from the non-woody fraction were also analyzed for macro- and micronutrient contents. In addition, soil samples were collected from each plot at depths of 0–10 and 10–20 cm for chemical analysis. The agroforestry system composed of cocoa and African mahogany (CMa) had the highest total litter stock (12.50 ± 2.48 Mg ha⁻¹), whereas CPMb (cocoa, piquiá, and Brazilian mahogany) had the lowest stock (4.18 ± 1.33 Mg ha⁻¹). For the non-woody fraction, CMa also showed the highest litter stock, with values statistically similar to those observed in FLO. Regarding the woody fraction, FLO showed the highest mean stock (2.95 ± 0.56 Mg ha⁻¹), although it did not differ statistically from CMa and CS (cocoa and rubber tree). The water-holding capacity of the non-woody fraction did not differ among ecosystems. However, for the woody fraction, CPMb showed significantly higher WHC than CMa and CS. For the miscellaneous fraction, FLO showed higher values only than CS. Considering total WHC, FLO (195.88 ± 12.61%) and CPMb (191.41 ± 1.67%) showed the highest values, whereas CS had the lowest (138.82 ± 19.00%). These results indicate that well-managed AFSs can accumulate litter stocks comparable to those found in secondary forests, although water-holding capacity and the relative contribution of litter fractions may vary according to species composition, structural arrangement, and land-use history. Such differences reflect the combined effects of management practices, plant diversity, and the structural characteristics of agroforestry systems. This dissertation reinforces the importance of AFSs as a strategy for restoring ecological functions and improving soil attributes in the Amazon while integrating agricultural production, environmental conservation, and the mitigation of environmental impacts. The indicators evaluated—litter stock, water-holding capacity, and soil fertility—provide relevant information for understanding the functioning and ecological performance of these systems.

2026-10-13T00:00:00Z RIBEIRO, Marcilene Priscila Moraes https://repositorio.ufra.edu.br/jspui/handle/riufra/2946 2026-10-19T18:22:12Z 2026-10-02T00:00:00Z

Título: Morfometria e crescimento da pescada-branca Plagioscion squamosissimus (HECKEL, 1840) no reservatório da UHE de Tucuruí, Amazônia Oriental. Autor(es): RIBEIRO, Marcilene Priscila Moraes Abstract: Studies on morphometry and growth are fundamental to understanding organism development and to supporting the adequate management of fisheries resources. This study aimed to analyse the morphometry and estimate the growth of the South American silver croaker, Plagioscion squamosissimus, in the Tucuruí reservoir, considering the environmental changes brought about by the damming of the Tocantins River. A total of 355 individuals were sampled over five campaigns conducted between December 2017 and January 2019; of these, 353 were included in the morphometric analyses, while the 355 specimens with valid total length and date records were used in the length-frequency analysis. Linear morphometric relationships and the length– weight relationship were analysed by area and by sex, and possible spatial size stratification was investigated through principal component analysis (PCA), redundancy analysis (RDA), and permutational multivariate analysis of variance (PERMANOVA); von Bertalanffy growth parameters were estimated indirectly and exploratorily, with all individuals pooled, using Electronic Length Frequency Analysis (ELEFAN). Allometric growth was predominantly isometric across all areas and sex groups, with significant positive allometry in both males and females in Area 2, and significant differences in body size distribution were detected among the sampled strata, partially associated with the environmental variables assessed; as the sectors were sampled in distinct periods, the spatial and temporal components could not be fully disentangled. The indirect growth estimate indicated an asymptotic length of 62.06 cm (620.6 mm) and a growth coefficient of 0.064 year⁻¹, a preliminary result given the reduced number of sampling dates available, which requires validation through independent methods. As the specimens were obtained using gillnets of different mesh sizes, the length-frequency data used in the growth estimate represent, finally, the fraction of the population vulnerable to the gear employed.; Studies on morphometry and growth are fundamental to understanding organism development and to supporting the adequate management of fisheries resources. This study aimed to analyse the morphometry and estimate the growth of the South American silver croaker, Plagioscion squamosissimus, in the Tucuruí reservoir, considering the environmental changes brought about by the damming of the Tocantins River. A total of 355 individuals were sampled over five campaigns conducted between December 2017 and January 2019; of these, 353 were included in the morphometric analyses, while the 355 specimens with valid total length and date records were used in the length-frequency analysis. Linear morphometric relationships and the length– weight relationship were analysed by area and by sex, and possible spatial size stratification was investigated through principal component analysis (PCA), redundancy analysis (RDA), and permutational multivariate analysis of variance (PERMANOVA); von Bertalanffy growth parameters were estimated indirectly and exploratorily, with all individuals pooled, using Electronic Length Frequency Analysis (ELEFAN). Allometric growth was predominantly isometric across all areas and sex groups, with significant positive allometry in both males and females in Area 2, and significant differences in body size distribution were detected among the sampled strata, partially associated with the environmental variables assessed; as the sectors were sampled in distinct periods, the spatial and temporal components could not be fully disentangled. The indirect growth estimate indicated an asymptotic length of 62.06 cm (620.6 mm) and a growth coefficient of 0.064 year⁻¹, a preliminary result given the reduced number of sampling dates available, which requires validation through independent methods. As the specimens were obtained using gillnets of different mesh sizes, the length-frequency data used in the growth estimate represent, finally, the fraction of the population vulnerable to the gear employed.

2026-10-02T00:00:00Z