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Brasília, Brazil

Haddad A.N.,Federal University of Rio de Janeiro | Galante E.B.F.,Exercito Brasileiro
Advances in Safety, Reliability and Risk Management - Proceedings of the European Safety and Reliability Conference, ESREL 2011 | Year: 2012

This work presents (mathematically) the phenomenon of explosion of a cylinder of LPG - Liquefied Petroleum Gas, mixing with air and the subsequent fireball. Currently, the mathematical tools used to model this kind of events relies upon the equations of state. Furthermore, it relies upon the Navier-Stokes equations to model the flow, the energy equation for the temperature. Usually this kind of models are calculated by the use of finite elements technique, having the continuity equation (density variation equal to zero) as convergence criteria. Using a computational platform some algorithms can be implemented to calculate expected the effects a Bleve (having gas as fuel). These algorithms used different hypothesis, witch allowed comparison. Among the hypothesis list, it ought to be enumerated: © 2012 Taylor & Francis Group. Source


Correia A.H.,Exercito Brasileiro | Da Costa Freitas C.,National Institute for Space Research | Mura J.C.,National Institute for Space Research
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2010

The objective of this article is to evaluate the influence of the cross-talk and channel imbalance calibration on the estimation of the entropy and the alpha images. Few studies can be found in SAR literature concerning the influence of the polarimetric image calibration process on the target decomposition methods and their consequences on the characterization and discrimination of different ground targets. This influence is illustrated here by using a methodology based on an L-band fully polarimetric SAR data acquired by the SIPAM (Amazon Protection System) airborne R99-SAR over two areas of study, located in the Brazilian Amazon Forest and urban area regions. © 2010 IEEE. Source


Vieira W.S.,Exercito Brasileiro | Rodrigues I.M.S.M.M.,Federal Rural University of Rio de Janeiro | Frade N.P.L.,Medica Veterinaria | Baldani C.D.,Federal Rural University of Rio de Janeiro | And 2 more authors.
Ciencia Rural | Year: 2013

The aim of this study was to evaluate the biochemical and the total antioxidant capacity (TAC) on polo horses, and the effect of selenium (Se) and vitamin E (vit-E) on these parameters. Sixteen horses were randomly divided into two groups, GE/Se (supplemented with vit-E and Se) and GC (control group) participated in a game of polo with four periods (chukkas) of 7min. Each horse has competed in two chukkas, with an interval of 7 min. Blood samples were collected 15min. before the game (baseline), at the end of the 1st and 2nd chukkas and 24h, 48h and 72h after the competition. Were analyzed the serum activity of aspartate aminotrasferase (AST), creatine kinase (CK) and lactate dehydrogenase (LDH), blood glucose and blood lactate concentration and total antioxidant capacity (TAC). There was no significant difference between GE/Se and GC to AST, CK and LDH. The activity of AST and LDH increased significantly compared to the baseline value, (P=0.097) and (P=0.0002), respectively, and remain elevated for more time in GC. CK didn't change significantly in relation to baseline in both groups. The blood lactate was significantly higger after each chukka than in baseline, but don't heve significant difference between GE/Se and CG. The CAT decreased significantly (P=2.90-25) after the first chukka, returning to baseline in 24 hours, but there was no difference between groups. It is concluded that supplementation with vit-E and Se had no influence on the parameters evaluated. The exercise changed the biochemical profile and the TAC without causing injuries, suggesting a good conditioning and adequate antioxidant protection. Source


De Oliveira J.E.G.,University of Brasilia | Barioni L.G.,Embrapa Cerrados | Braga A.C.,Exercito Brasileiro | Menezes M.E.,Exercito Brasileiro
Revista Brasileira de Zootecnia | Year: 2010

The objective of this study was to develop an economically optimal plan for pasture production and supplementary feeding of horses. The plan was based on the optimization of a multiperiodic linear programming model with the objective of minimizing overall feeding costs, subject to the nutritional constraints of each horse category. The model encompasses a period of one year, from January to December, divided in bimonthly periods. Technical coefficients varied among periods based on local information regarding productivity of the forage crops, taking into account the local climatic conditions and seasonality of production. Literature data on feed nutritional value (crude protein and digestible energy), dry matter intake and nutritional requirements of the horses were also used as technical coefficients. Optimization results allow concluding that it is possible to reduce significantly the feeding costs in the horse production system by decreasing supplementation and substituting the commercial concentrate by the oat grain produced in the local. © 2010 Sociedade Brasileira de Zootecnia. Source


Neves E.B.,Exercito Brasileiro | Neves E.B.,Federal Technological University of Parana | Neves E.B.,University of Tras os Montes e Alto Douro | Moreira T.R.,University of Tras os Montes e Alto Douro | And 4 more authors.
Revista Brasileira de Medicina do Esporte | Year: 2015

Introduction: Several studies already reported the response of many biomarkers after strength training, but studies using low cost diagnostic imaging tools are rare. Objective: To evaluate the usage of skin temperature and muscle thickness (MT) to monitor muscle response (until 96 hours after) to high-intensity strength training. Methods: This is a short-term longitudinal study with 13 trained, healthy male volunteers. Volunteers performed five sets of biceps bi-set exercise with their dominant arm with dumbbells, with load of 70% of one-repetition maximum (1RM). The ultrasound (US) and thermal images were acquired before and immediately after the last set, 24, 48, 72 and 96 hours after exercise. Results: The analysis was divided in two stages: acute muscle response (until 24 hours after training) and delayed muscle response (from 24 to 96 hours after training). The elbow flexors thickness showed the peak value immediately after the last set of training. Skin temperature (on elbow flexors) and the elbow flexors thickness grew continuously from 24 to 96 hours after strength training. There is a high correlation (r=0.941, p=0.017) between skin temperature and muscle thickness from the end of exercise until 96 hours after strength training. Conclusions: The US images showed high sensibility for muscle physiological changes on the first 24 hours after exercise. On the other hand, the thermal images had higher sensibility for muscle physiological changes than US images from 24 to 96 hours after training. © 2015 Redprint Editora Ltda. All rights reserved. Source

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