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Search Results: 1 - 10 of 550167 matches for " A. F.;Pimentel "
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Gastric Neoplasia during Anti-TNF Therapy for Crohn’s Disease: Casual Event?  [PDF]
F. M. L. Fortes, B. C. Silva, B. C. Silva, M. C. Lyra, A. M. Pimentel, G. O. Santana
Journal of Cancer Therapy (JCT) , 2015, DOI: 10.4236/jct.2015.68081
Abstract: The increase risk of cancer development in patients with inflammatory intestinal disease (IBD) has already studied for decades. The anti-TNF therapy has changed the treatment strategy of IBD. By using on a larger scale and for a longer time, the anti-TNF raised concern over its potential adverse events. A male Crohn’s disease (CD) patient, 55 years old, diagnosed for nine years, treated with infliximab for 6 years. In 2011, he underwent a nupper endoscopy (UE) which showed flat erosive gastritis with moderate intensity in antrum, gastric polyps and gastric erosion. Pathological examination revealed a chronic gastritis in erosive activity and search for Helicobacter pylori resulted positive. In May 2014, the patient was asymptomatic, when it held UE, which showed suggestive lesion of early gastric cancer, measuring 1.5 cm and search for Helicobacter pylori negative. Histopathological exams confirmed the adenocarcinoma. The patient underwent to a laparoscopic surgery (total gastrectomy with lymphadenectomy and reconstruction Roux-en-Y). Risk factors for the development of gastric cancer in general population are already well defined. However studying a possible association among CD and the different therapeutic modalities used in the treatment of this disease with gastric cancer appearance is important to set specific assessment strategies, prevention and follow-up. While there is no consensus on a proper monitoring for gastric cancer prevention in these patients, individualized conduct, taking into account individual characteristics, family record and other risk factors, should be adopted to avoid unfavorable outcomes in CD patients.
Aspectos do melhoramento genético do gado canchim
Vianna, A. Teixeira;Barbin, D.;Gomes, F. Pimentel;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1970, DOI: 10.1590/S0071-12761970000100007
Abstract: this paper deals with the estimation of the heritability of weight at the age of 18 months of heifers of the canchim breed, which is a 5/3 charolais x 3/8 zebu crossbred. it evaluates also the bulls and cows, through the heritage transmitted to their offspring. the study was carried out with the 18-month weights of 252 heifers, sons and daughters of 15 sires and 94 cows, adjusted for sex, and for season and order of delivery. the adjustment was carried out with the aid of the mathematical model with si (i = 1,2) referring to sex, ej (j = 1, 2, 3, 4) to season, and pk (k = 1, 2, 3, 4, 5) to parturition. with the adjusted weights yijkr obtained by the formula an analysis of variance was carried out, following the incomplete randomised model, with sires as blocks and cows as treatments using the theory developed by pimentel gomes (1967, 1968, 1970), with the following results. with the variance components e, dand s thus obtained the estimates hi; 1 and hi; 2 of the coefficients of heritability were calculated, by formulas having been obtained the following results: hi; 1 = 0.6325 ± 0.28, hi; 2 = 0.6292 ± 0.28. this study permitted also the evaluation of the bulls and cows of the herd.
The variance of the shock in the HAD process
Cristian F. Coletti,Pablo A. Ferrari,Leandro P. R. Pimentel
Mathematics , 2008,
Abstract: We consider the Hammersley-Aldous-Diaconis (HAD) process with sinks and sources such that there is a microscopic shock at every time $t$; denote $Z(t)$ its position. We show that the mean and variance of $Z(t)$ are linear functions of $t$ and compute explicitely the respective constants in function of the left and right densities. Furthermore, we describe the dependence of $Z(t)$ on the initial configuration in the scale $\sqrt t$ and, as a corollary, prove a central limit theorem.
Aspectos da determina??o da área basal em fun??o da média aritmética dos diametros: II - vícios na determina??o da área basal retirada
Veiga, Ricardo A. A.;Gomes, F. Pimentel;Godoy, Cássio R. M.;Cruz, Vivaldo F. da;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1971, DOI: 10.1590/S0071-12761971000100005
Abstract: as shown by pimentel gomes (1965), the theory proves that the use of the arithmetic mean of diameters to estimate basal areas in forestry leads to a bias. this paper evaluates this bias in the computation of cut out basal area in forestry thinnings, by means of theoretical study, samples generated in a computer, and also through the study of actual populations of trees in groves of araucaria angustifolia (bert.) o. ktze, pinus elliottii eng., p. taeda l. and p. caribaea var. hondurensis mor. the study thus carried out showed that the bias indicated can be rather serious.
Numerical study of wedge supported oblique shock wave-oblique detonation wave transitions
Pimentel, C. A. R.;Azevedo, J. L. F.;Figueira da Silva, L.F.;Deshaies, B.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000300002
Abstract: the results of a numerical study of premixed hydrogen-air flows ignition by an oblique shock wave (osw) stabilized by a wedge are presented, in situations when initial and boundary conditions are such that transition between the initial osw and an oblique detonation wave (odw) is observed. more precisely, the objectives of the paper are: (i) to identify the different possible structures of the transition region that exist between the initial osw and the resulting odw and (ii) to evidence the effect on the odw of an abrupt decrease of the wedge angle in such a way that the final part of the wedge surface becomes parallel to the initial flow. for such a geometrical configuration and for the initial and boundary conditions considered, the overdriven detonation supported by the initial wedge angle is found to relax towards a chapman-jouguet detonation in the region where the wedge surface is parallel to the initial flow. computations are performed using an adaptive, unstructured grid, finite volume computer code previously developed for the sake of the computations of high speed, compressible flows of reactive gas mixtures. physico-chemical properties are functions of the local mixture composition, temperature and pressure, and they are computed using the chemkin-ii subroutines.
Numerical study of wedge supported oblique shock wave-oblique detonation wave transitions
Pimentel C. A. R.,Azevedo J. L. F.,Figueira da Silva L.F.,Deshaies B.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: The results of a numerical study of premixed Hydrogen-air flows ignition by an oblique shock wave (OSW) stabilized by a wedge are presented, in situations when initial and boundary conditions are such that transition between the initial OSW and an oblique detonation wave (ODW) is observed. More precisely, the objectives of the paper are: (i) to identify the different possible structures of the transition region that exist between the initial OSW and the resulting ODW and (ii) to evidence the effect on the ODW of an abrupt decrease of the wedge angle in such a way that the final part of the wedge surface becomes parallel to the initial flow. For such a geometrical configuration and for the initial and boundary conditions considered, the overdriven detonation supported by the initial wedge angle is found to relax towards a Chapman-Jouguet detonation in the region where the wedge surface is parallel to the initial flow. Computations are performed using an adaptive, unstructured grid, finite volume computer code previously developed for the sake of the computations of high speed, compressible flows of reactive gas mixtures. Physico-chemical properties are functions of the local mixture composition, temperature and pressure, and they are computed using the CHEMKIN-II subroutines.
Síntese e caracteriza??o de espinélios à base de ferritas com gelatina como agente direcionador
Costa, A. F.;Pimentel, P. M.;Melo, D. M. A.;Melo, M. A. F.;Aquino, F. M.;
Ceramica , 2011, DOI: 10.1590/S0366-69132011000300015
Abstract: the ferrites with spinel type structure comprise a group of magnetic materials very well established. however, improvements and innovations are still happening seeking new applications and optimization of preparation techniques. among the materials with spinel structure, the ferrite stand out because they have a broad technological importance in the area of materials, with applications in humidity and oxygen sensors, microwave materials, pigments, magnetic materials and electrical, catalytic hydrogenation, thin films ceramic tiles, among others. in this work spinel-type cufe2o4 and cufecr2o4 were synthesized using gelatin as directing agent with the purpose of producing nanosized homogeneous particles through a simple, fast and affordable method. the ferrites were characterized by thermal analysis, x-ray diffraction, infrared spectroscopy and scanning electron microscopy. the results confirmed the feasibility of the used synthesis route.
Localization of Voltage Regulators in Distribution Systems by a Mixed Genetic–Tabu Search Algorithm  [PDF]
M. C. Pimentel Filho, M. F. Medeiros
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B145
Abstract:

The optimal allocation of regulators banks in distribution systems is a merely combinatorial problem in which the best points of installation correspond to the best benefit, considering the admitted objective function, without violating and operating limits. The objective function must be chosen so that its value represents the operation state of the system. As the problem possesses combinatorial nature, its complexity will increase exponentially with the number of possibilities. Systems with large numbers of nodes and / or with the possibility of installing more than one bank require a large number of calculations to find the solution. An additional issue is the fact that the problem does not have a continuous nature, presenting discontinuity points in the objective function, limiting the application of optimization methods based on gradients. Based on the nature of the problem two optimization methods were used to solve the problem: Genetic Algorithm (GA) and modified Tabu Search (TS). The GA function will scour the search space and find regions with local minima that are candidates to be the solution. On the other hand the TS provides local search in the regions defined by GA so that the overall optimum is achieved.

Does long-term coffee intake reduce type 2 diabetes mellitus risk?
Gustavo D Pimentel, Juliane CS Zemdegs, Joyce A Theodoro, Jo?o F Mota
Diabetology & Metabolic Syndrome , 2009, DOI: 10.1186/1758-5996-1-6
Abstract: Type 2 diabetes mellitus (DM2) is characterized by insulin resistance and/or abnormal insulin secretion, resulting in a decrease in whole-body glucose disposal. Individuals with chronic hyperglycemia, insulin resistance, and/or DM2 are at greater risk for hypertension, dyslipidemia, and cardiovascular disease [1].Although genetic factors may play a role in the etiology of DM2 [2], there is now convincing evidence that DM2 is strongly associated with modifiable factors, such as diet. Interestingly, among the several factors present in diet, coffee, one of the most widely consumed non-alcoholic beverages in Western society [3,4], is highlighted as a potent dietary-component associated with reduced risk of several chronic diseases, including DM2 and its complications [5-11]. Coffee is a complex mixture of more than a thousand substances, including caffeine (primary source), phenolic compounds (chlorogenic acid and quinides - primary source), minerals and vitamins (magnesium, potassium, manganese, chromium, niacin), and fibers [12] and several of these coffee constituents have a possible role in glucose metabolism.The present review provides an overview of the role of long-term coffee intake on the risks of glucose tolerance, insulin sensitivity, and DM2.The association between the coffee intake and the risk of developing DM2 has been examined by several researches. Cohort studies and a systematic review are summarized in Table 1. Data from a prospective study indicated an inverse association between coffee consumption and the risk of DM2 in men independently of race, age or serum concentration of magnesium. Individuals who drank at least seven cups of coffee daily had 50% lower risk to develop DM2 than those who drank two cups or fewer per day [7]. However, this study has not differenced the intake of caffeinated and decaffeinated coffee and didn't evaluate other sources of caffeine.Salazar-Martinez et al [8] evaluated the intake of coffee and caffeine from any sources
Influência do turno de rega no crescimento e produ??o do tomateiro no ver?o em Seropédica
Monte, José A;Pacheco, Adilson de S;Carvalho, Daniel F de;Pimentel, Carlos;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000200018
Abstract: the influence of the irrigation schedule was evaluated on the tomato culture, debora hybrid for salad, in a field experiment, in a split plot design with four treatments and four replications, conducted from september, 21st, 2005 to january, 31st, 2006. we evaluated the irrigation every day (tr0); irrigation every two days (tr1); irrigation every three days (tr2); irrigation every four days (tr3). 100% of the etc was applied in all treatments. during the essay, six samplings of plants were performed to determine the plant weight and leaf area to adjust equations for the estimation of the growth parameters. the maximum growth was obtained between 80 and 90 days after transplanting, but in these experimental conditions the growth analysis did not discriminate the treatments. the irrigation schedule of three days caused a reduction in the number of big fruits (>60 mm) and increase in the number of small fruits (40-50 mm). however, the irrigation frequency of two days showed the same or higher fruit quality of the smaller intervals, but with improved water use efficiency. for the spring-summer of 2005-2006 conditions, at seropédica, rio de janeiro state, brazil, the irrigation schedule of two days was the best to be recommended for the farmer.
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