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Search Results: 1 - 10 of 401980 matches for " Mendes J.F.F. "
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Critical behavior of models with infinitely many absorbing states
Mendes, J.F.F.;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000100010
Abstract: in this article we review several models with many absorbing configurations. in all these models attention will be focused on the in uence of the initial state on the dynamic evolution. the relation of systems with many absorbing configurations to those displaying avalanches (self-organized criticality) is also investigated. some new results are presented both for systems with and without parity conservation. recently derived scaling relations are tested.
Critical behavior of models with infinitely many absorbing states
Mendes J.F.F.
Brazilian Journal of Physics , 2000,
Abstract: In this article we review several models with many absorbing configurations. In all these models attention will be focused on the in uence of the initial state on the dynamic evolution. The relation of systems with many absorbing configurations to those displaying avalanches (self-organized criticality) is also investigated. Some new results are presented both for systems with and without parity conservation. Recently derived scaling relations are tested.
Estudo da qualidade da carne ovina do nordeste brasileiro: propriedades físicas e sensoriais
ZAPATA, J.F.F.;SEABRA, L.M.J.;NOGUEIRA, C.M.;BARROS, N.;
Ciência e Tecnologia de Alimentos , 2000, DOI: 10.1590/S0101-20612000000200025
Abstract: the study utilized 10 ? somalis-brasileira ? crioula (sb-c) rams and 11 ? santa-inês ? crioula (si-c) rams from two feeding treatments during weaning: grass hay + leucena hay (d1) and grass hay + leucena hay + 20% crude protein concentrate (d2). experimental data for ph, color, cooking losses, shear force and sensory analysis were analyzed in a randomized block design 2 ′ 2 (2 breeds ′ 2 feeding treatments). it was not observed effect of crossbreed or feeding treatments on meat quality attributes. meat ph values varied from 5.62 to 5.65, cooking loss varied from 21.45 to 23.90 % and shear force varied from 4.46 to 4.85 kg-f. meat color parameters varied from 36.67 to 37.70 for l*, from 14.85 to 15.54 for a* and from 0.83 to 1.37 for b*. sensory analysis of lamb showed a good acceptability with no differences between treatments. regardless of crossbreed or feeding regime used in this study lamb from northeast brazil is acceptable as measured by subjective or objective means.
Estudo da qualidade da carne ovina do nordeste brasileiro: propriedades físicas e sensoriais
ZAPATA J.F.F.,SEABRA L.M.J.,NOGUEIRA C.M.,BARROS N.
Ciência e Tecnologia de Alimentos , 2000,
Abstract: No presente estudo foram utilizados 21 animais machos, sendo 10 Somalis Brasileira Crioula (SB-C) e 11 Santa Inês Crioula (SI-C), submetidos a duas dietas durante a amamenta o: feno de capim-gram o + feno de leucena (D1) e feno de capim-gram o + feno de leucena + concentrado com 20% de proteína bruta (D2). Os resultados de pH da carne crua, assim como os da determina o de cor, perdas na coc o, for a de cisalhamento e análise sensorial foram analisados num arranjo fatorial 2 ′ 2 (duas ra as ′ 2 sistemas de alimenta o). N o foi verificado efeito das cruzas nem dos sistemas de alimenta o sobre os parametros de qualidade estudados. Na carne analisada, o pH variou de 5,62 a 5,65, as perdas na coc o de 21,45 a 23,90% e a for a de cisalhamento de 4,46 a 4,85 kg-f. A cor das carnes variaram de 36,67 a 37,70 para o valor de L*, de 14,85 a 15,54 para o valor de a* e de 0,83 a 1,37 para o valor de b*. A análise sensorial indicou uma boa aceita o das carnes avaliadas, sem diferen as entre os fatores estudados. De acordo com os resultados obtidos, a carne de borregos proveniente de animais do Nordeste brasileiro, apresentou características satisfatórias, tanto nas medi es objetivas como subjetivas, independente do genótipo ou da dieta utilizada.
Perfil fenotípico de linfócitos periféricos de bovinos de ra?as européias
Bittar, J.F.F.;Ribeiro, M.F.B.;Marciano, A.P.V.;Salcedo, J.H.P.;Martins-Filho, O.A.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2004, DOI: 10.1590/S0102-09352004000100016
Abstract: the phenotypic profile of bovine lymphocytes was evaluated in 18 bovines (bos taurus) from three different breeds, being nine holstein, six hereford, and three brown swiss. all animals were free from ticks and hemoparasites, as determined after jugular vein blood sampling. the immunophenotypes of peripheral lymphocytes were evaluated by flow cytometry. peripheral lymphocytes were exposed to bovine fluorescein-labeled monoclonal antibodies including anti-cd4, anti-cd8, and anti-purified bovine cd21 specificities. after lysing the erythrocytes with a commercial lysing solution (facstm ), the lymphocytes were washed, fixed, and evaluated by flow cytometry. significant differences in the phenotypic profiles of peripheral lymphocytes among all breeds were found. holstein animals showed a lower percentage of total t lymphocytes (cd4 and cd8) and higher percentage of b lymphocytes (cd21). in addition, the lymphocytes from holstein animals showed a lower t/b ratio than the lymphocytes from hereford animals. these results suggest the existence of different phenotypic profiles of peripheral lymphocytes from european breeds of cattle. such differences may be related to the different pattern of immune response described for these breeds in the literature and may account to varying disease resistance among breeds.
On the non-relativistic Casimir effect
Cougo-Pinto, M.V.;Farina, C.;Mendes, J.F.M.;Tort, A.C.;
Brazilian Journal of Physics , 2001, DOI: 10.1590/S0103-97332001000100008
Abstract: we compute the casimir energy for a massive scalar field constrained between two parallel planes (dirichlet boundary conditions) in order to investigate its non-relativistic limit. instead of employing the usual relativistic dispersion relation w(p) = , we use the non-relativistic one, w(p) = p2/2m. it turns out that the casimir energy is zero. we include the relativistic corrections perturbatively and show that at all orders the casimir energy remains zero, since each term in the power series in 1/c2 is proportional to the riemann zeta function of a negative even integer. this puzzling result shows that, at least for the free massive scalar field, the casimir effect is non-perturbative in the relativistic sense.
On the non-relativistic Casimir effect
Cougo-Pinto M.V.,Farina C.,Mendes J.F.M.,Tort A.C.
Brazilian Journal of Physics , 2001,
Abstract: We compute the Casimir energy for a massive scalar field constrained between two parallel planes (Dirichlet boundary conditions) in order to investigate its non-relativistic limit. Instead of employing the usual relativistic dispersion relation omega(p) = , we use the non-relativistic one, omega(p) = p2/2m. It turns out that the Casimir energy is zero. We include the relativistic corrections perturbatively and show that at all orders the Casimir energy remains zero, since each term in the power series in 1/c2 is proportional to the Riemann zeta function of a negative even integer. This puzzling result shows that, at least for the free massive scalar field, the Casimir effect is non-perturbative in the relativistic sense.
Phenomenological Model for the metal-insulator transition in two dimensions
Weisz, J.F;
Brazilian Journal of Physics , 2009, DOI: 10.1590/S0103-97332009000600017
Abstract: the resistivity measured in two-dimensional mosfet geometry is modeled by considering that the resistivity is a function of the temperature and the areal density of charges (electrons or holes). the logistics differential equation is proposed for the behaviour of the resistivity as a function of temperature, so that the two phases are obtained in a natural manner. at low temperatures, the drude model behaviour is assumed for the resistivity as a function of density. two characteristics then follow in a natural manner: the existance of a characteristic temperature for resistivity as a function of temperature, and the symmetry relationship. if the magnetic field is incorporated into the drude model, reasonable results are obtained for the qualitative behaviour of resistivity for weak fields.
Health Consequences of Obesity and Overweight
J.F. Babalola
Pakistan Journal of Social Sciences , 2012, DOI: 10.3923/pjssci.2011.118.124
Abstract: Obesity is a condition in which the natural energy reserve, stored in the fatty tissue of humans and other mammals is increased to a point where it is associated with certain health conditions or increased mortality. Although, obesity is an individual clinical condition, it is increasingly viewed as a serious and growing public health problem. Excessive body weight has been shown to predispose to various diseases particularly cardiovascular diseases, diabetes mellitus type 2, sleep apnea and osteoarthritis. Obese people are seen to be less active than lean people. A controlled increase in calorie intake of lean people did not make them less active; correspondingly when obese people lost weight they did not become more active. Weight stigma also known as weightism, weight bias and weight-based discrimination, refers to invidiously discriminatory attitudes towards overweight/obese individuals that influence interpersonal interactions. Weight stigma reflects internalized attitudes towards overweight and obese people and affects how these people are treated. Combined diet and exercise as well as drug therapy is effective for the prevention and management of obesity and overweight.
Identification of Optimal Models in Higher Order Integrated Autoregressive Models and Autoregressive Integrated Moving Average Models in the Presence of 2k-1 Subsets
J.F. Ojo
Journal of Modern Mathematics and Statistics , 2012,
Abstract: Significant efforts have been made in the study of the theory of integrated autoregressive models and autoregressive integrated moving average models, but less concerted effort has been made in the identification of optimal models which are of great importance in the forecasting of future values. Little attention has been focused on higher order integrated autoregressive models and autoregressive integrated moving average models which are always characterized by many parameters and the use of subsetting that eliminate redundant parameters in these higher order models. This study therefore focuses on identification of optimal models in higher order integrated autoregressive models and autoregressive integrated moving average models in the presence of 2k-1 subsets. The parameters of these models were estimated using Marquardt algorithm and Newton-Raphson iterative method and the statistical properties of the derived estimates were investigated. An algorithm was proposed to eliminate redundant parameters from the full order integrated autoregressive models and autoregressive integrated moving average models. To control the parameters of integrated autoregressive models and autoregressive integrated moving average models in the estimation procedure, the elements of 2k-1 subsets (when k=3) was used. To determine optimal models, residual variance, Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) were adopted.
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