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Search Results: 1 - 10 of 15750 matches for " Eunice Aparecida Campos "
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Performance evaluation of commercial copper chromites as burning rate catalyst for solid propellants
Eunice Aparecida Campos,Rita de Cássia L. Dutra,Luis Cláudio Rezende,Milton Faria Diniz
Journal of Aerospace Technology and Management , 2010,
Abstract: Copper chromites are well known as burning rate catalysts for the combustion of composite solid propellants, used as a source of energy for rocket propulsion. The propellant burning rate depends upon the catalyst characteristics such as chemical composition and specific surface area. In this work, copper chromite samples from different suppliers were characterized by chemical analysis, FT-IR spectroscopy and by surface area measurement (BET). The samples were then evaluated as burning rate catalyst in a typical composite propellant formulation based on HTPB binder, ammonium perchlorate and aluminum. The obtained surface area values are very close to those informed by the catalyst suppliers. The propellant processing as well as its mechanical properties were not substantially affected by the type of catalyst. Some copper chromite catalysts caused an increase in the propellant burning rate in comparison to the iron oxide catalyst. The results show that in addition to the surface area, other parameters like chemical composition, crystalline structure and the presence of impurities might be affecting the catalyst performance. All evaluated copper chromite samples may be used as burning rate catalyst in composite solid propellant formulations, with slight advantages for the SX14, Cu-0202P and Cu-1800P samples, which led to the highest burning rate propellants.
Pesquisa de ovos de helmintos e de cistos de protozoários em dinheiro
Levai,Eduardo Virgilio; Amato Neto,Vicente; Campos,Rubens; Pinto,Pedro Luiz Silva; Moreira,Antonio Augusto Baillot; Sant'Ana,Eunice José de; Padilha,Liliana Aparecida Araújo;
Revista de Saúde Pública , 1986, DOI: 10.1590/S0034-89101986000100004
Abstract: due to the high prevalence of intestinal parasitic diseases in brazil and to the fact that inanimate objects may play an important role in their transmission, it was decided to carry out an investigation into the existence of helminthic eggs and protozoan cysts in money currently handled by the community. a thousand and three banknotes and 1,011 coins of different origins were analysed, yielding the following results. entamoeba histolytica cysts were found twice, and fertile and infertile ascaris lumbricoides eggs and one intact taenia sp. egg, besides other nonpathogenic elements, were also found. the importance of the handling of money in the epidemiology of common intestinal parasitic diseases is emphasized and it is suggested that further similar studies should be carried out; possible means of prevention are also indicated.
Description of Pintomyia limafalcaoae and Pintomyia antioquiensis, Two New Species of Phlebotomine Sand Fly (Diptera, Psychodidae) from the Colombian Andes
Wolff, Marta;Galati, Eunice Aparecida Bianchi;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000300007
Abstract: two new species of phlebotomine sand fly from colombian andes are described, belonging to the subgenus pifanomyia of the genus pintomyia. p. (p.) limafalcaoae sp. nov. for which both sexes are described, is assigned to the series pia while p. (p.) antioquiensis sp. nov., known only from the male, is included in the series verrucarum. the subgenus pifanomyia is characterized and identification keys presented for the two new species.
Description of Pintomyia limafalcaoae and Pintomyia antioquiensis, Two New Species of Phlebotomine Sand Fly (Diptera, Psychodidae) from the Colombian Andes
Wolff Marta,Galati Eunice Aparecida Bianchi
Memórias do Instituto Oswaldo Cruz , 2002,
Abstract: Two new species of phlebotomine sand fly from Colombian Andes are described, belonging to the subgenus Pifanomyia of the genus Pintomyia. P. (P.) limafalcaoae sp. nov. for which both sexes are described, is assigned to the series pia while P. (P.) antioquiensis sp. nov., known only from the male, is included in the series verrucarum. The subgenus Pifanomyia is characterized and identification keys presented for the two new species.
Aspectos ecológicos da leishmaniose tegumentar americana: 5. Estratifica??o da atividade espacial e estacional de Phlebotominae (Diptera, Psychodidae) em áreas de cultura agrícola da regi?o do Vale do Ribeira, Estado de S?o Paulo, Brasil
Gomes, Almério de Castro;Galati, Eunice Aparecida Bianchi;
Memórias do Instituto Oswaldo Cruz , 1987, DOI: 10.1590/S0074-02761987000400004
Abstract: this paper deals with the investigation on the composition and stratification of the phebotominae activity developed in patch and clear areas of high agricultural activity. the employment of a cdc light trap proved to be a useful tool in determining the local faune. thirteen species of sandflies and a total of 5,423 individuals were caught. the catch places situated in the ecotone were the ones in which the results reached their best, being outstanding for psychodopygus intermedius, lutzomyia migonei and l. fischeri. thereby, data lead us to believe they have acrodendrophilous habit. on the other hand, when the global results were gathered according to male and female categories, the first one proved to be predominant. in the analysis of seasonal distribution for the three species cited, it was clear that the high-activity peaks were bi- and tri-modal for different seasons. p. intermedius was almost the exclusive sandfly caught at ground level in the autumn season. this exclusiveness has practically extended itself to the catch places situated in open field.
Novos encontros de flebotomíneos no Estado de S?o Paulo, Brasil, com especial referência à Lutzomyia longipalpis
Forattini,Oswaldo Paulo; Rabello,Ernesto Xavier; Galati,Eunice Aparecida Bianchi;
Revista de Saúde Pública , 1976, DOI: 10.1590/S0034-89101976000100012
Abstract: new records on phlebotominae in the state of s. paulo, brazil, are reported. special attention is dedicated to lutzomyia longipalpis. several behavioural aspects of these observations were recorded.
Flebotomíneos de Londrina, Paraná (Brasil) e observa??es ecológicas sobre algumas espécies
Gomes,Almério de Castro; Galati,Eunice Aparecida Bianchi;
Revista de Saúde Pública , 1977, DOI: 10.1590/S0034-89101977000200013
Abstract: an investigation undertaken in a primary forest of santa helena farm, londrina county, paraná, brazil, recorded thirteen species of phlebotominae sandflies. the main ones were psychondopygus whitmani, pintomyia fischeri and p. pessoai. the first one was predominant throughout the year while the seasonal behaviour was similar to three species. p. pessoai seems to be more suspectible to rain variation.
Aspectos ecológicos da Leishmaniose tegumentar americana: 7-Capacidade vetorial flebotomínea em ambiente florestal primário do Sistema da Serra do Mar, regi?o do Vale do Ribeira, Estado de S?o Paulo, Brasil
Gomes,Almério de Castro; Galati,Eunice Aparecida Bianchi;
Revista de Saúde Pública , 1989, DOI: 10.1590/S0034-89101989000200007
Abstract: a total of 5,038 specimens, belonging to nineteen species, were obtained during the three consecutive years of phlebotomine catches in forest and peridomiciliary environments of the itapoan farm. proportionally, the cdc light trap contributed with 92.2% in the forest and 0.7% in the peridomicile sites while the human bait corresponded to 7.0% in the forest. generally speaking the outcome of the technique utilized was rather low or presented reduced geometrical averages. the most common species in the area was p. ayrozai, almost always predominant; however, the results with human bait prevent one's ascribing a high degree of anthropophilic properties to it. the implication of the reduced presence of l.intermedia, l. migonei and l. fischeri, even with human bait, is that the conditions for the transmission of the disease to man in the forest environment are inexistent. consequently, this could indicate that the vectorial function would be performed by a population which has survived the period of devastation. for this reason a new epidemiological pattern, connected with a focus, of l.b. braziliensis seems to exist in brazil.
Padroniza??o da técnica imunoenzimática do ELISA de captura, no sistema avidina-biotina para a identifica??o de sangue ingerido por Lutzomyia (Lutzomyia) longipalpis (Lutz & Neiva, 1912)
Marassá, Ana Maria;Consales, Cleide Aschenbrenner;Galati, Eunice Aparecida Bianchi;
Revista da Sociedade Brasileira de Medicina Tropical , 2004, DOI: 10.1590/S0037-86822004000600003
Abstract: bloodmeals taken by insects constitute an important parameter for clarifying aspects of the transmission of zoonoses, including leishmaniases. immunological assays can be used to investigate the attraction of vectors to animals, which may be hosts of these parasitoses. the objective of this study was to standardize a sandwich enzyme-linked immunosorbent assay and titer samples with different time periods of digestion, in laboratory-bred lutzomyia longipalpis fed on rats. in the light of the high sensitivity that the biotin-avidin method permits, the technique provided at least ninety repeat tests for each sample and identified recent bloodmeals taken by these insects. bloodmeals were detectable up to 12 and 24h after blood ingestion, and a significant difference between these titers was observed.
A Mixed Convection Boundary Layer Flow over a Vertical Wall in a Porous Medium, with Exponentially Varying Fluid Viscosity  [PDF]
Eunice Mureithi
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.28087
Abstract:

This study investigates a mixed convection boundary layer flow over a vertical wall embedded in a highly porous medium. The fluid viscosity is assumed to decrease exponentially with temperature. The boundary layer equations are transformed into a non-similar form using an appropriate non-similar variable ξ and a pseudo-similar variable η. The non-similar equations are solved using an efficient local non-similarity method. The effect of viscosity variation parameter on the heat transfer, skin friction and the velocity and temperature distribution within the boundary layer is investigated. The viscosity variation parameter, the viscous dissipation parameter and non-simi-larity variable are shown to have a significant effect on velocity and thermal boundary layer and also on the skin friction coefficient and heat transfer at the wall.

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