Estudo comparativo de modelos matemáticos de qualidade de águas superficiais

Surface water quality models have been developed since 1925, when Streeter e Phelps created first order equations that represent the balance between DO and BOD. Since then, and specially after the ‘60s, new computational technologies evolved, making it possible to create more complex models, which try to represent, through mathematics, natural phenomena like eutrophication and rivers self-depuration. As main objective of such models is the understanding of aquatic systems and the relationship between them and the environment, so that it can support decision makers in creating water manage plans and in elaborating environmental projects of such resources. Regarding to that, it is of crucial importance the understanding of the models structures, so that one can choose the most appropriate model for the river in question. While one-dimensional models like QUAL2K are more appropriate for long and narrow rivers, bi- or tridimensional models (CE-QUAL-W2, WASP and CEQUAL- ICM) are more commonly used in wide and slower rivers, with higher lateral and/or vertical mixes rates. Besides, the more complex is the river studied more complex the model should be, which demands more costs and time for the model to be applied

Simulação de contaminação de sedimentos e águas subterrâneas por gasolina e álcool: um estudo de monitoramento de variações das propriedades físico-químicas

Geophysics studies in areas impacted by petroleum derivatives describe abnormalities of both low and high electrical resistivity (the opposite of electrical conductivity), confirmed as contaminant phase by chemical analysis: this contradiction can be explained by degrading processes that naturally occur and create sub products that can change the environment conductivity. Monitoring the variation of the parameters mentioned serves as a comparative basis to the variation in geoelectrical parameters, which identified the correlation between the same contaminant parameters and the difference between their behavior studied apart, as well as its relations with the biodegradation process. The results are applied to the fuel distribution and storage sectors, leading to the diagnosis and monitoring of possible groundwater contamination scenarios, and the knowledge of the area exposure time to the contaminant, besides the better remediation alternative and impacts control. Among some conclusions, the most significant are the decrease in conductivity over time, so as the increase in Eh value in the gasoline contaminated tank, as well as the decrease in the pH value in the second tank with ethanol, which can be attributed to its degradation. Comparing the variations in both tanks, it is evident that Eh, pH and electrical conductivity do not behave temporally in a similar way, although some correlations between Eh and pH can be related.

Fatores que interferem nas taxas de recuperação embrionária em éguas

The success in implementing an embryo transfer program derives from many factors. The embryo recovery rate is one of the most important factors, and allows the transfer to the recipient mare. This rate comes from a group of elements such as donor´s characteristics, collection date, reproductive management, semen quality, technician skill. Mainly because of the great importance of this direct interference on the results of an embryo recovery program, this study aimed to review the factors involved in embryo recovery rates in donor mares during an embryo transfer, suggesting some ways of improving these results

Integridade dos dados meteorológicos obtidos por duas estações meteorológicas automatizadas

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Comparação da eficiência de reatores aeróbios com paralisações escalonadas de aeração em diferentes concentrações de matéria orgânica no tratamento de águas residuárias do processamento de farinha de mandioca

Cassava wastewater, generated during cassava processing, is a highly polluting and toxic waste. This study aimed to assess the relationship of cassava treatment efficiency in two aerobic sequencing batch reactors, cylindrical plastics (31cm height x 9cm diameter), with 2.0 liters capacity and 1.5 liters of work volume, a ratio of diameter and height of the liquid 1:2.5, with a running time of 24 hours and stoppage aeration for 16 hours with average feed of 2,500 and 6,000 mg COD. L -1. COD, pH, SVI and F/M were analyzed. The results obtained in the two reactors showed an average reduction of 94.1% and 76.8% organic content, respectively; pH values showed a rising in the output pH values compared to entry ones; SVI values obtained: 54.1 mL/g, 99.3 mL/g, respectively in a F/M ratio values worked out of 0.4 d-1 and 1,1 d-1 , respectively. The results demonstrated that the process has generated considerable saving in energy consumption compared to traditional continuous systems, was efficient and did not affect the efficiency overly of the reactor.

Efeito da hCG ou deslorelina sobre a hemodinâmica folicular e perfil endogeno de LH em éguas cíclicas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estudo sobre desruptores endócrinos em sistemas aquáticos: detecção e perspectivas de tratamento das águas do Rio Aporé-MS/GO, utilizando-se adsorventes sólidos

Pós-graduação em Ciência dos Materiais - FEIS

Utiização de altrenogest injetável par o estabelecimento e manutençao da gestação em éguas receptoras de embriões acíclicas

Pós-graduação em Medicina Veterinária - FMVZ

Ocorrência de nitrato nas águas subterrâneas do Sistema Aquífero Bauru em áreas rurais

Pós-graduação em Geociências e Meio Ambiente - IGCE

Caracterização isotópica do CO2 dissolvido em águas subterrâneas no município de Paulínia, SP

Pós-graduação em Geociências e Meio Ambiente - IGCE

Análise do uso das águas de uma empresa do ramo petroquímico via análise de sobrevivência

Pós-graduação em Biometria - IBB

Ocorrência de alteradores endócrinos e fármacos nas águas de abastecimento público e ETE, em duas cidades da área de abrangência da UGRHI-21 e 22

Pós-graduação em Química - IQ

Avaliação da remoção de sulfametoxazol, diclofenaco e 17β-estradiol em águas por adsorção em carvão ativado granular

Pós-graduação em Engenharia Civil - FEIS

Utilização de resíduos de tratamento de esgoto como suprimento hídrico e nutricional na cultura do girassol

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA