Elliptical Model
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Avaliação empírica do modelo CAPM no mercado de capitais brasileiro via método dos momentos generalizados / Testing CAPM model in Brazilian Capital Market by GMM
The GMM method have been chosen in order to test non-conditional CAPM (Sharpe-Lintner and zero-beta) model in Brazilian security market, because the daily log-returns series of the analyzed shares did not showed itselves as normal and IID. This dissertation will be pioneer in testing the validity of the CAPM zero-beta model by GMM. We have realized that the
Publicado em: 2006
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14. Transferências orbitais e dinâmicas na vizinhança dos pontos lagrangianos L1 e L2 / Transfer orbits and dynamics around the lagrangian points L1 e L2
In this work we present a study of the dynamics in the vicinity of the Lagrangian points L1 and L2 in the restricted three-body problem, considering the Sun-Earth and Earth-Moon models. Notwithstanding the hyperbolic character of these points, the reduction to the central manifold allows periodic and quasi-periodic orbits. This procedure is applied through t
Publicado em: 2005
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15. Reconhecimento de padrões proteômicos e genômicos por aprendizagem de máquinas para o disgnóstico médico. / Employ machine learning to unveil encrypted molecular patterns within proteomic and genomic profiles to assist in personalized medical diagnosis.
Motivation: Employ machine learning to unveil encrypted molecular patterns within proteomic and genomic profiles to assist in personalized medical diagnosis. Results and conclusions: 1. Proteomic profile studies: Patients with Hodgkins disease (HD), a rare type of lymphoma, had their serum proteomic profile compared to control subjects (CS) in order to searc
Publicado em: 2005
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16. A CFD model for pollutant dispersion in rivers
Studies have shown that humankind will experience a water shortage in the coming decades. It is therefore paramount to develop new techniques and models with a view to minimizing the impact of pollution. It is important to predict the environmental impact of new emissions in rivers, especially during periods of drought. Computational fluid dynamics (CFD) has
Brazilian Journal of Chemical Engineering. Publicado em: 2004-12
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17. ARBITRARY CROSS SECTION WAVEGUIDES: ANALYSIS OF MODAL FIELDS AND OF DISCONTINUITIES BETWEEN ARBITRARY CROSS SECTION WAVEGUIDES / GUIAS DE ONDA DE SEÇÃO ARBITRÁRIA: ANÁLISE DE CAMPOS MODAIS E DE DESCONTINUIDADES EM GUIAS DE DIFERENTES SEÇÕES
In the present work, the modal fields and cutoff wavenumbers of arbitrary cross section waveguides are determined using the Rayleigh-Ritz method. Initially, the method is applied to waveguides with cross section approximated by a convex polygon. Polynomial basis functions are used. Such basis functions limit the number of modes that can be computed, since po
Publicado em: 2003
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18. Electron trajectories in a helical free-electron laser
A description is made of electron trajectories in a magnetic field consisting of helical wiggler and a uniform axial guide field. The explicit motion of particles for which the quadratic approximation to the Hamiltonian was carried out in some previous publications is now presented. The transverse position as a function of time is essentially the superpositi
Brazilian Journal of Physics. Publicado em: 2002-09
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19. Aberrant crypt foci and colon cancer: comparison between a short- and medium-term bioassay for colon carcinogenesis using dimethylhydrazine in Wistar rats
Aberrant crypt foci (ACF) in the colon of carcinogen-treated rodents are considered to be the earliest hallmark of colon carcinogenesis. In the present study the relationship between a short-term (4 weeks) and medium-term (30 weeks) assay was assessed in a model of colon carcinogenesis induced by dimethylhydrazine (DMH) in the rat. Six-week-old male Wistar r
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-03
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20. Mecanismos de alojamento de magmas granitóides :exemplo do plúton de Japi(RN)
This dissertation describes the igneous suites of the Japi granitoid pluton, intrusive in the Paleoproterozoic gneiss-migmatite complex of the eastern domain of the Seridó Belt, northeastern Brazil. Field relations show that the pluton is affected by strong deformation associated to the Brasiliano orogeny (known as the D3 phase) , with a NW-trending extensi
Publicado em: 1998
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21. Um modelo quase-analitico para simulação tridimensional de propagação de fratura hidraulica
Several models for the development of a fully three-dimensional hydraulic fracturing simulator have been described in the literature. However, most of them result in systems that require computational efforts not compatible with the direct application in the field. In order to attenuate this problem, simplified assumptions are introduced, resulting in pseudo
Publicado em: 1996
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22. Analise numerica do escoamento convectivo entre placas verticais
The numerical modeling of the laminar convective flow between vertical plates was carried out in order to obtain the solution of the elliptical equations describing the problem. Experimental results obtained in the literature were used to verif the accuracy of the method. Eventually, study cases were considered for situations of interest in cooling of eletro
Publicado em: 1992
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23. Technique for evaluating left ventricular performance with apical two-dimensional echocardiography: Progress report
A technique of modelling the left ventricle for the purpose of volume determination has been devised. Two-dimensional echocardiographic data from the apical four chamber and two chamber views are used to pattern the ventricle as a stack of elliptical discs. The method has been validated for an array of regular geometric shapes commonly associated with ventri
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24. Crystal structure of truncated human apolipoprotein A-I suggests a lipid-bound conformation
The structure of truncated human apolipoprotein A-I (apo A-I), the major protein component of high density lipoprotein, has been determined at 4-Å resolution. The crystals comprise residues 44–243 (exon 4) of apo A-I, a fragment that binds to lipid similarly to intact apo A-I and that retains the lipid-bound conformation even in the absence of lipid. The
The National Academy of Sciences of the USA.