http://hdl.handle.net/10183/19217 2026-11-14T10:15:58Z http://hdl.handle.net/10183/308898 Desempenho do satélite TRMM na estimativa de precipitação sobre a bacia do Paraguai Superior Collischonn, Bruno; Allasia Piccilli, Daniel Gustavo; Collischonn, Walter; Tucci, Carlos Eduardo Morelli A bacia do Paraguai Superior, situada no planalto da Bacia do Alto Paraguai, gera significativa parcela do aporte de vazão que garante ao Pantanal a sua alternância natural entre secas e cheias. A estimativa de sua pluviosidade, no entanto, sofre incertezas devido ao baixo número de pluviômetros na bacia. Neste contexto, estimativas espaciais de precipitação podem se constituir numa ferramenta extremamente útil. Estas estimativas, embora pouco precisas quando comparadas com valores puntuais medidos no solo, fornecem uma boa noção da distribuição espacial das chuvas. Neste trabalho, são analisados os campos de precipitação e as precipitações médias obtidos do satélite TRMM, lançado com o intuito específico de estimar precipitação nos trópicos. Os campos foram comparados com os obtidos a partir de dados de pluviômetros no solo sobre a bacia do Alto Paraguai até a Fazenda Descalvados. Os resultados são muito satisfatórios, mostrando que as estimativas deste satélite podem ser uma fonte alternativa de dados em caso de escassez de informação.; The Higher Paraguai river, a tributary of the Upper Paraguai Basin, generates a significative share of the flows that maintains the natural oscillation between floods and droughts in the Pantanal. However, a precise estimation of its rainfall variability is uncertain, due to the low number of rain gauges at the basin. Thus, areal estimates of precipitation obtained from remote sensing can become a very useful data source. Such estimates, although not as precise as punctual measurements, have the advantage to give very fair representations of spatial distribution of rain. In this work, we analysed rain fields and mean rain heights derived from the Tropical RainfallMeasuring Mission (TRMM) satellite. Comparisons with ground data area made to the Upper Paraguai Basin, limited by the flow gauge of Descalvados. Results are very promising, showing that rain estimates provided by this satellite can be a reliable data source for basins with strong scarcity of data. 2007-01-01T00:00:00Z http://hdl.handle.net/10183/307230 Critérios para o planejamento do espaço rural em sistemas de irrigação Dorfman, Raul O sistema agrícola de produção é analisado. São estabelecidas premissas para o planejamento das comunidades rurais com relação a sua finalidade socioeconômica. Analisa-se a operacionalidade dos estabelecimentos agrícolas, comparando-se os padrões dispersos (modelo brasileiro) com os padrões agregados (socialista ou cooperativado) com relação a concentração de terra e cultivos, iniciativa pessoal do agricultor, eficiência econômica e tecnológica da propriedade, estabilidade social e itens correlatos. Conclui-se que, independentemente de tecnologias empregadas, o padrão agregado (coletivo ou cooperativado) é mais eficiente que o padrão disperso representado pelos latifúndios e minifúndios.; The agricultural production system is analized. Principles of rural settlement planning, as related to socioeconomic goals, are determined. Operation of agricultural enterprises is analized, comparing scattered patterns (socialist or cooperative), as functions of land and crops concentration, farmers' initiative, farm economic and technological efficiency, social stability and related items. It is concluded that the aggregated (socialist or cooperative) pattern is more efficient than the scattered pattern (represented by the latifundias and minifundias), indepently of the technologies employed. 1982-01-01T00:00:00Z http://hdl.handle.net/10183/306638 Two-step simple synthesis of nanoscale carbon spheres via the Stöber method using black wattle tannin as an eco-friendly precursor for supercapacitor applications Costa, Max Krapf; Sampaio, Edna Jerusa Pacheco; Santos Júnior, Adilar Gonçalves dos; Cuña Suárez, Andrés; Labat, Gisele Aparecida Amaral; Malfatti, Célia de Fraga The growing demand for sustainable energy storage solutions has prompted the exploration of eco-friendly materials for supercapacitor applications. In this study, we present a simple two-step synthesis of nanoscale carbon spheres using a modified Stöber method, employing black wattle tannin extracted from Acacia mearnsii as a carbon precursor, in comparison with the conventional resorcinol precursor. Morphological characterization revealed that highly homogeneous nanoscale spheres were obtained. Physicochemical characterizations indicated that the tannin-derived spheres exhibited residual silica content due to incomplete template removal, which increased series resistance and limited the material’s performance. Although inferior to resorcinol-derived spheres, which achieved a specific surface area of 2093 m2 g−1, the tannin-derived material still exhibited a high surface area of 457 m2 g−1 and a specific capacitance of 66.3 F g−1 in aqueous H2 SO4 electrolyte, with well-defined morphology achieved without an activation step. By using an environmentally friendly precursor, we successfully produced a material with a homogeneous and well-defined structure, high surface area, and obtained through a simple two-step process of polymerization and carbonization without additional activation. These findings may open new directions for future research. 2025-01-01T00:00:00Z http://hdl.handle.net/10183/306634 Predicting cell viability from titanium surface properties using machine learning-based decision tree analysis Gamba, Mateus Luiz; Fernandes, Fabiano Rodrigues; Castro, Victor Velho de; Wives, Leandro Krug; Malfatti, Célia de Fraga This paper introduces a computational tool designed to assist in classifying and predicting in vitro cellular activity using a dataset derived from the roughness, wettability, and surface morphology of titanium dioxide (TiO2) and titanium (Ti) surfaces. Numerous studies compare TiO2/Ti surface treatments to enhance osteoblast cellular activity; however, critical gaps remain in understanding how surface properties influence cellular responses. This research compiles a dataset based on peer-reviewed scientific articles published on academic platforms, focusing on surface characteristics: roughness, contact angle, presence of nanostructures such as nanotubes, and the percentage gain in cellular viability of MC3T3-E1 osteoblasts obtained from MTT assays (3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide), relative to control samples. Using this data, an Index of Classification of Increased Cell Activity (ICICA) was developed to categorize cellular responses into three levels: low, medium and high. Using the constructed dataset, decision tree algorithms were applied to develop a model capable of predicting cellular viability. Among the tested algorithms, the Random Forest model demonstrates superior performance regarding accuracy and Kappa coefficient. The developed model provides valuable insights to guide the design of new surface treatments regarding surface properties, such as roughness, wettability, and morphology of pure Ti, aiming to improve the cellular viability. 2025-01-01T00:00:00Z