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Uma investigação sobre paradigmas tecnológicos e abordagens pedagógicas dos tutores inteligentes nos sistemas de ensino-aprendizagem
(Universidade Federal de São Carlos, 2008-03-17) Monaco, Fabíola Maria; Mizukami, Maria da Graça Nicoletti
This research work has as its starting point the conjecture posed by Oliveira regarding a possible technicist reflux yielded by the dissemination of new information and communication technologies (ICTs) over varying extents (political, economical, scientific etc.), highlighting its incidence on the implementation of its resources in the domain of the methods and techniques of education. In this context, focusing on the Intelligent Tutoring Systems (ITS) as a representative instance of such educational technologies (with novel paradigms with respect to other media such as data extraction and computation and information inference), this investigation aims at assessing and explaining, through the pedagogical perspective, the possible occurrence of approximations to the technicism. The methodology relies on the in-depth study of the ITS based on the pedagogical paradigms which ground the focused educational technology, being the method of analysis that of established models and processes of the System Engineering field, in which ITS are effectively developed as artifacts. The results identify and explain non-intentional technicists approximations that are not inherent neither to the conception nor to the implementation, but to an intermediary phase of the process corresponding to the system design. In addition, some considerations are drawn on the difficulties and hindrances found in the disciplinary study of interfacing technologies
Estudo do comportamento da deposição das partículas de diferentes meios filtrantes
(Universidade Federal de São Carlos, 2008-03-17) Tanabe, Eduardo Hiromitsu; Aguiar, Mônica Lopes; https://lattes.cnpq.br/0431688649128529; https://lattes.cnpq.br/9778700143605069
Many studies related to bag filters have focused on minimizing the amount of energy used in the process. Seeking longer filtration cycles, lower frequency of cleaning cycles and a longer filter life, such studies search for fabrics which present easy cake removal and the least loss of residual pressure drop. There are many studies related to the formation and removal of filtration cakes but little is known about the behavior of particles deposited on the inside of the filter and what influence these particles have on the performance of filters. For this reason, the objective of this study was to investigate particle deposition behavior and particulate materials on the interior of different filter materials after the cleaning process and to evaluate the impact of these particles on the regeneration of the fabric under microscopic examination. Particulate materials utilized were phosphatic rock and manioc starch with filter mediums of treated polyester, untreated polyester, polypropylene and acrylic. The filter trials were carried out at a filtration velocity of 0.10 m/s. The cake removal process was done by reverse airflow at a cleaning velocity of 0.12 m/s. The maximum pressure drop permitted in the filtration trials was 980 Pa. Utilizing phosphatic rock and acrylic, polypropylene and treated polyester, the depth of particle deposition on the polypropylene fabric was less deep in relation to the other two fabrics studied. The residual pressure drop of this fabric was greater, demonstrating that the accumulation of particulate material in this filter medium provided a greater resistance to flow, due to the smaller spacing encountered between the fibers of this fabric and consequent closing of pores. For the manioc starch particles on treated and untreated polyester, a greater depth of particle deposition was observed on the untreated polyester, showing that the absence of treatment allowed the fabric to obtain greater particle deposition on the interior of the filter medium, which increased the resistance to flow and the system residual pressure drop. This shows that the characteristics of the filter medium and the particulate material both exercise an influence on the depth of particle deposition and on residual pressure drop in the system. Thus, the best performance encountered utilizing particulate materials of phosphatic rock or manioc starch under the experimental conditions, was with the treated polyester. A study on the effects of the operational variables on particle deposition depth was also conducted, utilizing a three level experimental plan, 3k, to evaluate the effect of the variables, filtration velocity (Vf) and filtration time (tf). Results showed that both these variables presented an influence on the response variable, but the variable that produced the greatest significant effect was the filtration velocity. The utilization of lower values of velocity and lower values of filtration times is suggested to achieve lower levels of particle deposition depth, because the increase in particle deposition on the interior of the filter obstructs the air flow through the filter, thus slowing the cleaning process and provoking an increase in residual pressure drop.
A lucidez imperfeita: ensaio sobre Freud como escritor
(Universidade Federal de São Carlos, 2008-03-17) Carone, André Medina; Santos, Paulo Roberto Licht dos; https://lattes.cnpq.br/1681044854219924; https://lattes.cnpq.br/5392166032777488