Navegando por Data de Publicação, começando com "2016-09-09"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 3 de 3

Diversidade e possíveis aplicações quimiotaxonômicas dos polissacarídeos extracelulares de microalgas verdes cocoides
(Universidade Federal de São Carlos, 2016-09-09) Meccheri, Fabricio Sebastiani; Vieira, Armando Augusto Henriques; https://lattes.cnpq.br/4428377384377272; https://lattes.cnpq.br/5145878523613413
The extracellular polysaccharide (EPS) produced by microalgae have mainly been studied because of their relevance to aquatic environments (Myklestad 1995). As the monomer composition of the EPS is presented as heteropolymers often composed of a diversity of monomers and that the diversity of EPS between algae is huge and taxonomically close organisms each other have compounds slightly different, made us believe in their use for chemotaxonomy of microalgae. The use of EPS for this purpose, was due to the ease of extracting them from cultures, their facility to be analyzed, together with their specificity and their constitution by only one or two fractions. This study goal was to verify the possibility of using EPS as features for a possible chemotaxonomic approach. Thus the characterization of algae polysaccharides was essential for a better understanding of the differences and similarities found in the EPS. Thus, throughout the chapters we will look at the characterization of specific groups which had most representatives for the selected genres. These genera were: 1) Ankistrodesmus; 2) complex Selenastrum / Messastrum / Curvastrum; 3) Monoraphidium; and 4) Kirchneriella. The observation of monomers / specific bond within the genera, due to the characterization of EPS, showed us that there are possible differentiation between strains / species and at the genus level.
Proposta para aplicação de desbaste no acervo da Biblioteca Comunitária da UFSCar
(Universidade Federal de São Carlos, 2016-09-09) Gonçalves, Vânia Helena; Pereira, Neocles Alves; https://lattes.cnpq.br/3744216524256924; https://lattes.cnpq.br/1914108245602148
The Community Library (BCo) of the Universidade Federal de São Carlos (UFSCar) has a lack of physical space for the growth of library collections and at the same time keeps bibliographies that may not be anymore interesting of making part of Basic and complementary bibliography for teaching plans of undergraduate courses of this university. The lack of bibliographic material thinning policy has been an obstacle for the administration of the library with the aim to remove the collection that is not interest of the users of the BCo and consequently make the better use of the library's physical space, such as the inclusion of new acquisitions and/ or expand study spaces to users. The aim of this mastering dissertation is to evaluate the bibliographic collection of BCo and propose a thinning policy to contribute to the rationalization of physical space. For this, are considered the lack of relevant circulation of the collection of the last 3, 7 and 10 years respectively, by existing knowledge area on the campus of UFSCar in San Carlos city. The methodology approach is the action research, providing both participation of the professional staff of the BcO and the community as well, as the expected implementation of thinning practices that should result of this dissertation.
Deformação piroplástica em porcelanatos
(Universidade Federal de São Carlos, 2016-09-09) Conserva, Lisandra Rafaela dos Santos; Melchiades, Fábio Gomes; https://lattes.cnpq.br/4469106561041487; Boschi, Anselmo Ortega; https://lattes.cnpq.br/3259846931278607; https://lattes.cnpq.br/7757508543729131
In recent years porcelain stoneware tiles showed the highest growth in production and consumption in ceramic industry sector. To achieve low porosity, which ensures the high performance of the product, is required the formation of large amount of liquid phases during sintering and the flow of these liquids are responsible for the undesirable pyroplastic deformation. Some factors exacerbate the problem: large and rectangular shapes and faster firing cycles. Moreover, the production of tiles through a more sustainable route, the dry route, lacks studies evaluating the effects of processing method on pyroplastic deformation. Thus, this study aimed to contribute to reducing the incidence of pyroplastic deformations in porcelain stoneware tiles, in order to identify the main variables involved and suggest maneuvers for achieve this goal. In the first stage, technical porcelain stonewares were formulated using common raw materials in this type of manufacturing and prepared by wet route. The main difference between the batches was that 10% of the feldspar was replaced with other raw materials such as potash feldspar and quartz in different granulometries in order to change the characteristics of the liquid phases and to minimize pyroplastic deformation. The characterization of the batches before and after firing, as well the assessment of physical and chemical / mineralogical effects of the raw materials on deformation behavior was essential to identify the variables prevalent in deformation. In second stage some batches from previous step were prepared by dry route method, and then the same tests were performed in order to evaluate the effects of processing route on pyroplastic deformation. The results indicated that batches prepared by dry processing route are less likely to deformation mainly due to heterogeneity of microstructure. In both stages, it was found out that the viscosity of the liquid phase formed during firing is the variable that affects most significantly the pyroplastic deformation of the porcelain obtained by both processing routes studied.