https://ri.ufs.br/jspui/handle/riufs/1077 Sat, 25 Apr 2026 23:05:33 GMT 2026-04-25T23:05:33Z https://ri.ufs.br/jspui/handle/riufs/23663 Título: Chuvas intensas para o estado de Sergipe com base em dados desagregados de chuva diária Autor(es): Aragão, Ricardo de; Santana, Geizon R. de; Costa, Clarissa Eiras Fialho Flores da; Cruz, Marcus Aurélio Soares; Figueiredo, Eduardo Eneas de; Srinivasan, Vajapeyam Srirangachar Abstract: Floods have frequently been observed worldwide, particularly in urban and rural areas of Brazil as a consequence of antropic impacts and climate change. To cope with the problem hydraulic structures are designed based on the observed maximum flood, or statistically predicted through the rainfall-duration relationship established with recorded data, which are generally scarce. Due to the lack of such data, disaggregation of daily rainfall is generally utilized. In the State of Sergipe-Brazil, the rainfall-duration relationships were established utilizing disaggregated daily rainfalls, observed in 48 stations, and the probability distributions of Weibull and Gumbel. The best results were obtained with the Weibull distribution. The spatial distributions of the parameters of the rainfall-duration relationships demonstrated the high rainfall variability in the region. Fri, 01 Mar 2013 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/23663 2013-03-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/23649 Título: Análise de sensibilidade dos parâmetros do modelo SWAT e simulação dos processos hidrossedimentológicos em uma bacia no agreste nordestino Autor(es): Aragão, Ricardo de; Cruz, Marcus Aurélio Soares; Amorim, Julio Roberto Araujo de; Mendonça, Luciana Coêlho; Figueiredo, Eduardo Eneas de; Srinivasan, Vajapeyam Srirangachar Abstract: Erosion has been recognized as the main cause of soil degradation and is accelerated by human intervention in watersheds, causing losses to the agricultural sector and damaging the environment. To estimate the impacts caused by land use or climate changes on hydrosedimentological processes, physically-based distributed models have been shown to be quite effective. In this study, the SWAT model was calibrated and validated for two subwatersheds of the Japaratuba Mirim river watershed, one located upstream of the Fazenda Pão de Açúcar - PA (137.3 km2 ), and another located upstream of Fazenda Cajueiro - CJ (277.8 km2 ) in the state of Sergipe, to simulate runoff and soil erosion. To test the sensitivity of the calibrated parameters, the runoff was also simulated by a cross application of the 12 most sensitive parameters in the two watersheds, from 1985 to 2000. The results showed that the model was able to simulate the runoff and forecast, in a consistent way, the sediment yield. However, while the cross application of the parameters from the bigger (CJ) to the smaller watershed (PA) resulted in satisfactory Nash-Sutcliffe efficiency (NSE) and percent bias (PBIAS), the opposite was not true. Thu, 01 Aug 2013 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/23649 2013-08-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/20885 Título: Attached biomass growth and substrate utilization rate in a moving bed biofilm reactor Autor(es): Marques, José Jailton; Souza, Roberto Rodrigues de; Souza, Carina Siqueira de; Rocha, Inaura Carolina Carneiro da Mon, 01 Dec 2008 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/20885 2008-12-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/1082 Título: Atual estágio de desenvolvimento da tecnologia GTL e perspectivas para o Brasil Autor(es): Ramos, André Luís Dantas; Marques, José Jailton; Santos, Vagner dos; Freitas, Lisiane dos Santos; Santos, Rosanne Graziele Vieira de Melo; Souza, Mariana de Mattos Vieira Mello Abstract: Although the production of liquid fuels from coal, natural gas (CTL and GTL processes) and other carbon sources has been discovered 90 years ago, the interest was renewed in the last years motivated by stranded gas reserves and by petroleum market instability. This review intends to show the scenario of these technologies nowadays, discussing the applied technologies, the steps in an industrial plant, the ways to produce syngas and liquid fuels, the catalysts used, the type of reactors and the operating plants with their respective capacities, besides the technical, economical and environmental viability, challenges and perspectives for Brazil. Sat, 01 Jan 2011 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/1082 2011-01-01T00:00:00Z