https://rd.uffs.edu.br/handle/prefix/68 2025-12-02T23:47:12Z https://rd.uffs.edu.br/handle/prefix/8669 Title: Avaliação dos efeitos do bioinseticida vectobac® no comportamento de peixes-zebra Author: Toussaint, Stephanie First advisor: Hartmann, Marilia Teresinha Abstract: Vector control is an essential measure in public health, aimed at preventing and reducing the transmission of diseases caused by organisms such as mosquitoes and flies, which act as vectors for various pathogens. Various control strategies can be routinely applied to combat mosquitoes and flies of public health concern. As a key strategy, larvicides are being applied to mosquito breeding sites. One such product is the biological larvicide VectoBac® 12 AS, which can be applied directly to water to target mosquito larvae. Although effective against mosquitoes, its potential adverse effects on non-target organisms remain unclear. Here, we evaluated the impact of VectoBac® 12 AS exposure on zebrafish behavior. Fish were exposed for 30 minutes to concentrations of 1.5, 2.5, and 10 μg/L, followed by assessments of exploratory behavior and social preference. Exposure to bioinsecticide induced an anxiolytic effect in zebrafish but did not alter social preference. These findings demonstrate that even biological products can negatively impact aquatic species. Moreover, they highlight the need for toxicity assessments of biological agents to confirm their environmental safety. Publisher: Universidade Federal da Fronteira Sul Type: Monografia 2025-06-01T00:00:00Z https://rd.uffs.edu.br/handle/prefix/8660 Title: Impact of the highest internal temperature in solar inverters: shorter life and higher probability of failure Author: Bruel, Gabriela Mesquita First advisor: Esposito, Marcelo Publisher: Universidade Federal da Fronteira Sul Type: Monografia 2025-06-01T00:00:00Z https://rd.uffs.edu.br/handle/prefix/8659 Title: Legislações e técnicas de tratamento de água: propostas de melhorias com base nas legislações internacionais Author: Santos, Mario Jorge dos First advisor: Dalla Rosa, Clarissa Abstract: Water is a scarce resource, and with the significant increase in population, the demand for drinking water has grown, requiring stricter treatment methods and regulations regarding physicochemical and microbiological parameters. In this context, this work aims to conduct a comparative analysis between Brazilian national legislation and international legislation (United States and Switzerland), with the purpose of suggesting improvements to the current regulations, focusing mainly on pharmaceutical products, and subsequently indicating the best treatment methods for such componentes. The Brazilian ordinance stands out for its strong foundation regarding "everyday" parameters such as physicochemical and microbiological ones, and for being easy to understand due to its clear organization and language. However, in terms of new contaminants, communication methods with consumers, and monitoring, it has several gaps that could be improved, especially when it comes to emerging compounds such as pharmaceuticals. These components are not removed during conventional water treatment processes, which are the most commonly used in the country. Therefore, adjustments to these techniques are necessary in order to inactivate these micropollutants. It is thus recommended to create specific regulations for the control of pharmaceuticals, or to include them in the Brazilian ordinance, along with monthly transparency reports on water quality and periodic reviews of the established limit values. Regarding the most effective methods for removing pharmaceutical compounds, ozonation, activated carbon filtration, and membrane filtration stand out. All of them have proven to be effective in removing various studied pharmaceuticals; however, nanofiltration stands out due to the higher number of removable pharmaceutical compounds. It is important to emphasize, however, that feasibility studies should be conducted in the region, taking into account factors such as water quality and treatment scale. For Brazil to make progress, stricter communication with customers and pharmaceutical monitoring are necessary, as well as improvements in treatment methods Publisher: Universidade Federal da Fronteira Sul Type: Monografia 2025-06-01T00:00:00Z https://rd.uffs.edu.br/handle/prefix/8658 Title: Engenharia de materiais sustentáveis: desenvolvimento e avaliação de ligante de óxido de magnésio e resíduo agroindustrial Author: Piovesan, Maria Alice First advisor: Korf, Eduardo Pavan Abstract: Portland cement is widely used in the stabilization of soils, hazardous waste, mining tailings, and other materials. However, this binder has low resistance to attack by certain contaminants, and its production chain is responsible for high extraction of natural resources, energy consumption, and CO₂ emissions. Given this, this study developed and evaluated an alternative binder produced from magnesium oxide (MgO) and rice husk ash (RHA) as a more sustainable option compared to Portland cement. An experimental design was conducted to investigate the unconfined compressive strength (UCS) of the mixtures, considering different contents of the dispersant sodium hexametaphosphate (SHMP) and varying MgO/RHA ratios. The curing time and temperature were fixed at 7 days and 23 °C. The chemical, mineralogical, and microstructural characteristics of the mixtures were evaluated using FTIR, XRD, and SEM/EDS. The results indicated that UCS is significantly influenced by all investigated factors, particularly the SHMP content. The highest recorded strength was 8.19 MPa, achieved with an MgO/RHA ratio of 1.5 and 4% SHMP. However, the most economical formulation, with statistically equivalent mechanical performance, was obtained with an MgO/RHA ratio of 1 and 3% SHMP (8.03 MPa). Chemical analysis revealed the progressive formation of M–S–H gel, while mineralogical analysis indicated the presence of brucite (a product of MgO hydration) and cristobalite (derived from RHA). Microstructural analysis, in turn, pointed to the gradual formation of M–S–H and the persistence of unreacted phases in the matrix. Publisher: Universidade Federal da Fronteira Sul Type: Monografia 2025-07-01T00:00:00Z