Navegando por Data de Publicação, começando com "2009-05-27"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 4 de 4

Avaliação ecoepidemiológica e sanitária de piscinas coletivas da cidade de São Carlos - SP
(Universidade Federal de São Carlos, 2009-05-27) Sueitt, Ana Paula Erbetta; Souza, Clovis Wesley Oliveira de; https://lattes.cnpq.br/0781683628437007; https://lattes.cnpq.br/0153508580030437
A hundred sixty samples of water were collected to assess the sanitary and ecoepidemiological conditions of collective swimming pools in São Carlos SP. The samples were collected between August/2007 and Abril/2008. The pools were characterized by application of a questionnaire, answered by people responsable for the water treatment. Physical and chemical analysis included: pH, temperature, alkalinity, free chlorine concentration and turbidity. All water samples were analyzed for heterotrophic plate counts by pour plate method. Membrane filter technique was used to isolate amoebae and other bacteria. Eleven pools were heated and nine were unheated. Half of the pools was indoors and the other half was outdoors. Seventeen pools were chlorinated and three pools had a combined disinfection, two using chlorine and UV and one using chlorine and ozone. Only 13 samples (8%) conformed within the desired standards for pH, turbidity and free chlorine concentration at the same time. Twelve samples (7.5 %) were unacceptable for heterotrophic bacteria and 63 (39 %) were unsatisfactory for the presence of total coliforms. Escherichia coli was detected in two samples. Moreover, 102 samples (64 %) were contaminated with at least one microorganism.The percentages of occurrence were: 14 % for Staphylococcus spp, 35 % for Pseudomonas spp, 33 % for Mycobacterium spp and 21 % for free-living amoebae. The amoebae identified were used to recover bacteria possibly present intracellularly . Of these 33 samples positive for protozoa, 18 (54 %) harbored Mycobacterium spp, 15 (45 %) harbored Pseudomonas spp and one (3 %) harbored Staphylococcus spp. Escherichia coli was not recovered from amoebae. The physical and chemical parameters most related to the occurrence of microorganisms in the samples studied were pH and chlorine. No significant relationship was identified between water temperature and occurrence of microorganisms. Overall, the inappropriate forms of treatment and maintenance of swimming pools studied might create conditions for the development of microorganisms, including those potentially pathogenic for human.
Análise fluviológica e ambiental da bacia hidrográfica do rio Jaú - SP
(Universidade Federal de São Carlos, 2009-05-27) Rezende, Jozrael Henriques; Pires, José Salatiel Rodrigues; https://lattes.cnpq.br/3412204514901170; https://lattes.cnpq.br/4418756295562718
The fluviological analysis is an important tool for planning and managing watersheds once that, by means of the characterization of discharges regime and the pulse of a water curse, it helps to indicate their hydrological state and the contributes to handle the natural resources with focus on ecosystemic services. Using secondary data and knowledge of statistics hydrology, as well computational tools, this study assessed and compared the main discharge variables and the pulse of the rivers situated in the Tietê - Jacaré Water Resources Management Unit. In spite of similar climatic conditions of the basins, the indicators have shown that there is grayer instability of the pulse of River Jaú when compared to the Rivers Jacaré-Pepira; Jacaré-Guaçu and Boa Esperança. The River Jaú has presented the lowest specific minimum discharges and the greatest specific maximum discharges as well as the lowest specific permanence discharges. Also it was the only river to reach, during the study period, the critical drought weather discharge estimates by the Hydrological Regionalization Method for São Paulo State. Furthermore, the fluvial diagram of the River Jaú was most instable and the least predictable, showing a greater number of pulses, the greatest maximum tension and the lowest average amplitude. The environmental analysis has indicated that greater instability of the pulse of the River Jaú is directly related to the poor index of natural vegetal cover and to the high level of risk of the consumption uses of its water. Therefore, based on the method of analysis of multiple criteria with the aid of a Geographic Information System, the present study suggests a proposal of prioritization of areas for Legal Forest within the watershed.
O mapeamento tecnológico e a gestão de tecnologia no CNPDIA - Embrapa
(Universidade Federal de São Carlos, 2009-05-27) Franco, Renato Ribeiro; Pinho, Marcelo Silva; https://lattes.cnpq.br/3458289442156207
The technology forecast and management methods have been considered by academics and managers important tools to support technology development. Generally the organizations, which are worried about this issues, needs data and information to look ahead and clarify technologies course before it happens. Considering that development s time has become shorter, these kind of methodologies may turn more and more important. Despite of these matters, it s rare to find papers and related cases to this subject in Brazil. That s why this study has the objective of collect and discuss methodologies, and right after that, compare the Technology Roadmap (TRM) to the CNPDIA s method of technology forecast and management. This TRM method is frequently presented in the related magazines. The work realized has compared the dimension of the TRM, considering some extras observations. These extras looks offered a more complete view and understanding of the environment in which the technology activities took place. The expected intention was to collaborate by analyzing some of the CNPDIA s characterizes. One extra hope is to inspire some discussion in the unit observed, based on this work.
Estudo do processo de eletrodeposição e caracterização de ligas de Sn-Zn
(Universidade Federal de São Carlos, 2009-05-27) Taguchi, Allan da Silva; Mascaro, Lucia Helena; https://lattes.cnpq.br/9130022476352844; https://lattes.cnpq.br/1332718539145545
This study evaluated the electrodeposition processes of Sn, Zn and Sn-Zn alloy in the absence and presence of tartaric acid as complexing agent. Initially all the systems studied were evaluated by Cyclic Voltammetry to determine the deposition potentials of the pure metals and alloy. The results showed that the presence of the complexant shifts the deposition process of both Sn and Zn to more negative potential values. The metals codeposition can be determined by the variation in the shape and potentials of the peaks of deposition in the voltammograms obtained for the alloy when compared to those for individual metals. The potential-step technique (Chronoamperometry) was used to characterize the initial stages of electrocrystallization. It was found that the nucleation processes of Sn (in the absence and presence of the complexant) and Sn-Zn alloy (in complexed medium) are governed by progressive nucleation, while for Zn in both media and for the Sn-Zn alloy in non-complexed medium were ill-defined. Thus, these can be characterized as mixed processes. Films obtained at different deposition potentials were characterized by Scanning Electron Microscopy (SEM), Energy-Dispersive X-Ray Spectroscopy (EDX). It was observed that using the tartaric acid it was possible to obtain more uniform and homogeneous deposits and, apparently, favouring the reduction process and achieving a more protective coating. The morphology, composition and X-Ray Diffraction (XRD) of films galvanostatically deposited varying the complexing agent (potassium sodium tartrate or sodium gluconate) and the deposition current (5,0 mA cm-2 and 30,0 mA cm-2) were also analyzed. It was found that at a lower current density the films obtained showed a better uniformity, while those obtained at a higher current density showed a finer grain structure due to an increased nucleation rate in this last instance. Moreover, we can say that the tartrate favours the deposition of Zn when compared to the gluconate. By the XRD analysis it was possible to observe that the alloys consist of separated phases of Sn and Zn crystals and they do not form any intermetallic compound.