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Search Results: 1 - 10 of 606068 matches for " R. A. Fonseca "
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Keynes’ Analytical System as an Econometric Tool: Examining Macroeconomic Trends in the U.S. from 1950s to 1980s  [PDF]
Manuel A. R. Da Fonseca
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.810112
Abstract: The initial goal of this paper is to develop the standard Keynes’ analytical system into a dynamic macro-econometric model, which is then applied to the analysis of macroeconomic indicators for the U.S. from 1950s to 1980s—a period marked by strong volatility of inflation, exchange rates and commodity prices. Based on the results obtained and, in particular, on the model’s structure and exogenous variables, it is possible to single out the main factors that explain the macro-trends observed in the American economy. Further, a second and more important goal is to evaluate if a simple macro-dynamic model can be a relevant tool in empirical analysis of macroeconomic developments. The results obtained indicate that, although the elements of the Keynesian system are most often used in a purely theoretical perspective, a macro-econometric model based on those elements can be successfully used in reproducing overall macroeconomic variables in a certain period—and the determinants of those macro-trends can be traced to the model’s exogenous variables.
Faddeev equation approach for three-cluster nuclear reactions
A. Deltuva,A. C. Fonseca,R. Lazauskas
Physics , 2012,
Abstract: In this lecture we aim to present a formalism based on Faddeev-like equations for describing nuclear three-cluster reactions that include elastic, transfer and breakup channels. Two different techniques based on momentum-space and configuration-space representations are explained in detail. An important new feature of these methods is the possibility to account for the repulsive Coulomb interaction between two of the three clusters in all channels. Comparison with previous calculations based on approximate methods used in nuclear reaction theory is also discussed.
Avalia??o energética e de desempenho de frangos com aquecimento automático a gás e a lenha
Funck, Sandro R.;Fonseca, Ricardo A.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2008, DOI: 10.1590/S1415-43662008000100014
Abstract: in this research automatic infra-red gas heating and wood-burning were analyzed, with three lineages of broilers raised from may 1, 2005 to june 16, 2005 in 1200 m2 poultry houses, and slaughtered at the age of 45 days. the energetic consumptions and costs were evaluated for each system, as well as the following zootechnical indexes: mean weight, mortality, feed conversion and consumption. the experimental design was completely randomized in a factorial 2 x 3 model, made up by two heating systems, three lineages of male broilers and six treatments and six replications, totaling thirty six poultry houses with 13,300 birds each. for the statistical analysis the sisvar 4.6 program was utilized and the comparisons of means were done using the tukey test. the results obtained were as follows: the energy consumption for wood was 173.21 gj per lot and the cost was r$ 3.23 gj per lot, and for gas it was 20.26 gj per lot with a cost r$ 53.78 gj per lot. in relation to the zootechnical performance, there were no significant differences between the two systems, but for the lineages significant difference was observed. the cobb lineage had a 6.62% higher mean weight and 1.04% higher mortality when compared to the ross 1 lineage.
dHybrid: a massively parallel code for hybrid simulations of space plasmas
L. Gargaté,R. Bingham,R. A. Fonseca,L. O. Silva
Physics , 2006, DOI: 10.1016/j.cpc.2006.11.013
Abstract: A massively parallel simulation code, called \textit{dHybrid}, has been developed to perform global scale studies of space plasma interactions. This code is based on an explicit hybrid model; the numerical stability and parallel scalability of the code are studied. A stabilization method for the explicit algorithm, for regions of near zero density, is proposed. Three-dimensional hybrid simulations of the interaction of the solar wind with unmagnetized artificial objects are presented, with a focus on the expansion of a plasma cloud into the solar wind, which creates a diamagnetic cavity and drives the Interplanetary Magnetic Field out of the expansion region. The dynamics of this system can provide insights into other similar scenarios, such as the interaction of the solar wind with unmagnetized planets.
Expansion of a plasma cloud into the solar wind
L. Gargaté,R. A. Fonseca,R. Bingham,L. O. Silva
Physics , 2008, DOI: 10.1109/TPS.2008.922424
Abstract: Three-dimensional (3D) hybrid particle-in-cell (PIC) simulations, with kinetic ions and fluid electrons, of a plasma cloud expansion in the solar wind are presented, revealing the dynamics of the expansion, with shock formation, magnetic field compression, and the solar wind ions deflection around the plasma bubble. The similarities of this system with a magnetosphere are also pointed out.
Absor??o de nutrientes pela amoreira Morus alba L
Dechen, A. R.;Fonseca, A. S.;Haag, H. P.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1973, DOI: 10.1590/S0071-12761973000100011
Abstract: in order to find out the concentration of macro and micronutrients, as well, the total amount of nutrient absorbed by the cultivar from 30 days up, until 280 days, leaves and branches were collected at different days and analysed for the nutrients. among the macronutrients, n was found in the highest concentration followed in the next decresead order: fe, mh, zn, b, cu. one mulberry tree content at 130 days after bud: n-22.1 gr.; p-1.6 gr.; k-18.5 gr.; ca-13.3 gr.; mg-3.5 gr.; s-1.2 gr.; b-4.7 ugr.; cu-6.5 ugr.; fe-109 ugr.; mn-70.6 ugr.; zn-30 ugr.
Deficiência dos macronutrientes e do boro em três variedades de amoreiras
Fonseca, A. S.;Dechen, A. R.;Haag, H. P.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1973, DOI: 10.1590/S0071-12761973000100012
Abstract: slipes of the varieties fern?o dias, formosa and calabreza were grew in pots containing pure quartz sand. several times a day all the plants were irrigated with hoagland and arnon's solution of 30 days. after, that period, groups of plants (5) were irrigated with nutrient solution lacking one nutrient (-n,-p,-k,-ca,-mg,-s and -b). soon as the deficiences symptoms become visible the plants were harvested and analysed for the macronutrients and boron. the plants showed deficiencies symptoms in the following order: nitrogen, magnesium, calcium, phosphorus, potassium and boron. no sulphur deficiencies symptoms were observed. the tissue analysis of the leaves of plants showing deficiencies symptoms or not were:
SCIENCE PRODUCTION AND THE UNDERGRADUATE PROJECT: A CASE STUDY OF THE OCEANOGRAPHY AT CTTMAR-UNIVALI. O PROJETO DE GRADUA O E A PRODU O CIENTíFICA: ESTUDO DE CASO DO CURSO DE OCEANOGRAFIA DO CTTMAR-UNIVALI
L. A PROEN?A,R. S. FONSECA,M. I SANTOS
Brazilian Journal of Aquatic Science and Technology , 2003,
Abstract: This paper aims to investigate and quantify the science generated by the undergraduate project carried out by Oceanography students from UNIVALI. The data was obtained by interviews with the projects supervisers and search using the CNPq LATES bibliographic production data base. In general, each undergraduate project produced 1.5 scientific contribution, within journal paper, book chapter, proceedings full paper or proceedings abstract categories. This later category was the one that produced the greater contribution. About 10% of the scientific production of the superviser where related to the projects. The results shows that apart from the their objectives, which are driven to the student formation, the undergraduate project also contribute to the science production of the Oceanography Course. O presente trabalho visa caracterizar os Projetos de Gradua o do Curso de Oceanografia da UNIVALI enquanto meio de produ o científica. O levantamento foi feito com entrevistas aos orientadores dos trabalhos, tendo como base a produ o bibliográfica disponível na Plataforma Lattes, do CNPq. Em média, cada projeto teve uma produ o igual a 1,5, nas categorias: artigos completos em periódicos, capítulos de livros, trabalhos completos em anais e resumos apresentados em congressos, excluindo-se participa es em seminários de inicia o científica. Resumos em congresso foi a categoria com maior contribui o. Considerando a produ o dos orientadores, os PG representam cerca de 10% do total. Os resultados indicam que, além de atender aos objetivos da disciplina, os projetos de gradua o s o um importante meio de inicia o científica para o aluno e colaboram para a produ o total dos orientadores.
Nucleon-nucleon charge symmetry breaking and the dd -> alpha pi0 reaction
A. C. Fonseca,R. Machleidt,G. A. Miller
Physics , 2009, DOI: 10.1103/PhysRevC.80.027001
Abstract: We show that using parameters consistent with the charge symmetry violating difference between the strong nn and pp scattering lengths provides significant constraints on the amplitude for the dd -> alpha pi0 reaction.
Bound state techniques to solve the multiparticle scattering problem
J. Carbonell,A. Deltuva,A. C. Fonseca,R. Lazauskas
Physics , 2013, DOI: 10.1016/j.ppnp.2013.10.003
Abstract: Solution of the scattering problem turns to be very difficult task both from the formal as well as from the computational point of view. If the last two decades have witnessed decisive progress in ab initio bound state calculations, rigorous solution of the scattering problem remains limited to A$\leq$4 case. Therefore there is a rising interest to apply bound-state-like methods to handle non-relativistic scattering problems. In this article the latest theoretical developments in this field are reviewed. Five fully rigorous methods will be discussed, which address the problem of nuclear collisions in full extent (including the break-up problem) at the same time avoiding treatment of the complicate boundary conditions or integral kernel singularities. These new developments allows to use modern bound-state techniques to advance significantly rigorous solution of the scattering problem.
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