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Search Results: 1 - 10 of 167435 matches for " E.;Chinelatto "
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Post mortem analysis of burned magnesia-chromite brick used in short rotary furnace of secondary lead smelting
Prestes, E.;Chinelatto, A. S. A.;Resende, W. S.;
Ceramica , 2009, DOI: 10.1590/S0366-69132009000100008
Abstract: burned magnesia-chromite bricks are the standard product for the lining of furnaces in lead industry, where the short service life is a great problem. used sintered magnesia-chromite brick sample from short rotary furnace lining, sent by a secondary lead manufacturer, showed parallel cracks to the hot face due to structural spalling damage. the refractory infiltrated region and slag interface were analyzed using a scanning electron microscope with an energy dispersive spectroscopy analyzer, and x-ray diffraction powder analysis. crucible corrosion test was performed to evaluate the influence of slag attack. the results showed that the structural spalling was due to strong pb-infiltration of the refractory microstructure by bath components of the furnace (metallic lead and lead sulphite) during the reduction process and that the slag infiltration had little contribution due to the good resistance of the magnesia-chromite bricks to feo rich slag attack.
Contribui??o para o estudo dos mecanismos de transmiss?o do agente etiológico da doen?a de Chagas
Ribeiro,Rosa Domingues; Garcia,Terezinha Aparecida Rissato e; Bonomo,Walter Chinelatto;
Revista de Saúde Pública , 1987, DOI: 10.1590/S0034-89101987000100008
Abstract: the infection of several opossums didelphis albiventris, male, female and young, by oral means by feeding them either on infected triatomines or on mice experimentally infected by tripanosoma cruzi, is studied. after feeding uncontaminated opossums on carcasses or living specimens of baby mice, infected with the bolivian strain of t.cruzi, a 60.0% infection index was obtained on xenodiagnoses. on the other hand, after feeding uncontaminated opossums on infected triatomines, an 83.3% index was obtained on xenodiagnoses. these results indicate that the feeding on infected mammals, as well as the ingestion of infected triatomines by omnivorous animals gives high infection indices and demonstrates the importance of the oral route as the means of access of t. cruzi. the also show the importance of opossums as reservoirs of the parasite in the natural focci of infection and as carriers of t. cruzi to the domicile because of their migratory habits.
Downturn LGD: A More Conservative Approach for Economic Decline Periods
Mauro R. Oliveira,Armando Chinelatto Neto
Quantitative Finance , 2014,
Abstract: The purpose of this paper is to identify a relevant statistical correlation between rate of default, RD, and loss given default, LGD, in a major Brazilian financial institution Retail Home Equity exposure rated using the IRB approach, so that we may find a causal relationship between the two risk parameters. Therefore, according to Central Bank of Brazil requirements, a methodology is applied to add conservatism to the estimation of the Loss Given Default parameter at times of economic decline, reflected as increased rates of default.
Porcelanas elétricas aluminosas: Parte I - Revis?o da literatura
Chinelatto, A. L.;Souza, D. P. F. de;
Ceramica , 2004, DOI: 10.1590/S0366-69132004000100010
Abstract: porcelains are multiphase ceramics produced from natural raw materials. the microstructural development of these ceramics depends on their composition, on the characteristics of the raw materials, and on the ceramic processing. due to the complexity of porcelains, several aspects of the microstructural evolution and its effects on the properties of porcelains are as yet little understood, despite the large number of reports published on the subject. part i of this article is a literature review on aluminous porcelains, focusing on the effect of their compositions on their electrical and mechanical properties, as well as the influence of some additives on their microstructural development.
Porcelanas elétricas aluminosas: parte II - desenvolvimento da microestrutura e sua influência no módulo de ruptura
Chinelatto, A. L.;Souza, D. P. F. de;
Ceramica , 2004, DOI: 10.1590/S0366-69132004000300002
Abstract: the microstructure and bending strength of aluminous porcelains were analyzed at rising sintering temperatures. it was found that, in the presence of high alumina content, the particle rearrangement process during sintering is inhibited by the formation of a skeleton of alumina particles that are insoluble in the liquid phase. the bending strength increases along with the amount of crystalline phase, with the alumina particles contributing more effectively to this increase than the mullite crystals.
Inquérito sobre conhecimentos e atitudes da popula??o sobre a transmiss?o do dengue - regi?o de Campinas S?o Paulo, Brasil - 1998
Donalisio, Maria Rita;Alves, Maria José Chinelatto Pinheiro;Visockas, Alexandre;
Revista da Sociedade Brasileira de Medicina Tropical , 2001, DOI: 10.1590/S0037-86822001000200008
Abstract: a survey with 502 interviews was realized in the region of campinas (s.p.) to evaluate the community's knowledge and concepts regarding dengue: disease, vector and prevention. this information was then compared with the actual behavior towards prevention and the presence of breeding sites. three neighborhoods of santa barbara d'oeste (170,000 inhabitants) were chosen because they were located in the first municipality with autochthonous transmission, since 1995. areas with better social and urban conditions scored higher in terms of knowledge compared with peripheral neighborhoods, even though these regions had priority in the local education program, due to case notification. however, breeding sites were found equally in both regions. a major gap between knowledge and attitude was detected in all regions. the results of the survey can help the organization of education programs to find ways to put this knowledge into practice. this instrument is useful to monitor the impact of dengue control programs.
Inquérito sobre conhecimentos e atitudes da popula o sobre a transmiss o do dengue - regi o de Campinas S o Paulo, Brasil - 1998
Donalisio Maria Rita,Alves Maria José Chinelatto Pinheiro,Visockas Alexandre
Revista da Sociedade Brasileira de Medicina Tropical , 2001,
Abstract: Trata-se de um inquérito amostral (502 entrevistas) realizado na regi o de Campinas SP, em Santa Bárbara D'Oeste (170.000 habitantes), por ser o primeiro município a registrar casos de dengue autóctone na regi o, desde 1995. Avaliou-se o conhecimento da popula o sobre o dengue, seu vetor e preven o em 3 bairros da cidade. Estas informa es foram comparadas com a presen a de criadouros no ambiente domiciliar, em áreas com e sem transmiss o. O bairro com melhores condi es sociais e urbanas apresentaram conhecimento mais adequado sobre a doen a, embora os bairros periféricos tenham sido priorizados em atividades educativas devido à ocorrência de casos. Observou-se criadouros em todas as áreas examinadas, em quantidades semelhantes. Constatou-se a distancia entre conhecimento e mudan as de comportamento. Identificou-se as fontes de informa es mais referidas e os criadouros predominantes nos domicílios. Os resultados deste inquérito podem servir como subsídios para (re)orientar a es educativas das equipes de controle de vetores, bem como avaliar um instrumento simplificado para acompanhamento do impacto do programa local de controle do dengue.
Alumina ceramics obtained by chemical synthesis using conventional and microwave sintering
Thomazini, D.;Gelfuso, M. V.;Chinelatto, A. S. A.;Chinelatto, A. L.;Sanson, F. K.;Teixeira Neto, F.;
Ceramica , 2011, DOI: 10.1590/S0366-69132011000100006
Abstract: it is well known that the heating mechanism and powder precursor define the microstructural characteristics of ceramics. especially abnormal grain growth of pure alumina ceramics developed during conventional sintering method suggests that this material is a potential candidate to be treated in microwave sintering process. alumina ceramics produced with commercial (a1k) and chemically synthesized powders were sintered in conventional and microwave furnaces. two methods were employed to prepare the chemically synthesized nanosized powders: pechini method and emulsification with oleic acid. the microwave sintered samples were characterized by apparent density and scanning electron microscopy and compared with the samples sintered in a conventional furnace. alumina ceramics sintered in the microwave furnace had fine grained microstructure, not related with the starting powders. this characteristic was achieved in a sintering time shorter than those produced in the conventional furnace. however, satisfactory densification was observed only to a1k ceramics (3.95 g/cm3) sintered during one hour in microwave furnace.
Characterization of high-energy milled alumina powders
Tomasi, Roberto;Rabelo, Adriano A.;Chinelatto, Adriana S. A.;Reis, Laudo;Botta Fo, Walter J.;
Ceramica , 1998, DOI: 10.1590/S0366-69131998000500003
Abstract: the utilization of reactive high-energy milling has been reported for the synthesis of ceramic powders namely, metal oxides, carbides, borides, nitrides or mixtures of ceramics or ceramic and metal compounds. in this work, high-energy milling was used for reduction of alumina powders to nanometric particle size. the ceramic characteristics of the powders were analyzed in terms of the behavior during deagglomeration, compaction curves, sintering and microstructure characterization. it was observed that the high energy milling has strong effect in producing agglomeration of the nanosized powders. this effect is explained by the high-energy impact of the balls, which may fracture particles or just cause the particles compacting. in this case, strong agglomerates are produced. as the powder surface area increases, stronger agglomerates are produced.
Malária na regi?o de Campinas, S?o Paulo, Brasil, 1980 a 1994
Alves, Maria José Chinelatto Pinheiro;Rangel, Osias;Souza, Savina Silvana Aparecida Lacerra de;
Revista da Sociedade Brasileira de Medicina Tropical , 2000, DOI: 10.1590/S0037-86822000000100008
Abstract: according to epidemiological data, from 1980 to 1994, 2,781 cases of malaria were registered as follows: dir xii - campinas (49.3%), dir xv - piracicaba (41.3%) and dir xx - s?o jo?o da boa vista (9.4%). the plasmodium vivax was found in 70.6% of the patients; plasmodium falciparum in 25.4% and 4% of the patients presented a mixed infection. the epidemiological classification showed that 95% of the cases came from the states of rondùnia, mato grosso and par·. the masculine sex, between the age of 20 to 39 years old, was responsible for 84.3% of the confirmed cases. during the study period, 9 cases of induced malaria were registered: 5 of which through blood transfusion, 3 through the sharing of syringes and infected needles among drug users and one occurrence of congenital malaria. 5 deaths were registered in patients prime-infected by plasmodium falciparum with late diagnosis. the set of variables studied enabled a greater understanding of the epidemiology of malaria in the region and to subsidize and indicate the process of decentralization of attendance, diagnosis and treatment of the patient, as well as the control and epidemiological surveillance of the endemic disease in campinas region and in the state of s?o paulo.
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