Velocity Variation
Mostrando 13-24 de 164 artigos, teses e dissertações.
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13. Impact Damage Analysis with Stress Continuity Constraints Fulfilment at Damaged-Undamaged Regions and at Layer Interfaces
Abstract Low-velocity impacts have a relevant importance for safety of laminated and sandwich composite structures, because they are highly susceptible to damage. In this paper, a 3D cost effective zig-zag model is developed in order to efficiently simulate such impacts. It a priori fulfills the continuity of out-of-plane stresses at layer interfaces, the co
Lat. Am. j. solids struct.. Publicado em: 2017-08
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14. Analysis of combustion efficiency in a pelletizing furnace
Abstract The objective of this research is to assess how much the improvement in the combustion reaction efficiency can reduce fuel consumption, maintaining the same thermal energy rate provided by the reaction in a pelletizing furnace. The furnace for pelletizing iron ore is a complex thermal machine, in terms of energy balance. It contains recirculation fa
REM, Int. Eng. J.. Publicado em: 2016-09
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15. Análisis numérico del ámbito de validez del modelo convencional de tiro oblicuo
In a diagnosis survey about ballistics, given to a group of undergraduate students, a high percentage of wrong answers was obtained about estimates of air resistance and other phenomena affecting the movement of a projectile. These mistakes are related to a simplified model widely used in textbooks as well as in lectures. This model assumes that the variatio
Rev. Bras. Ensino Fís.. Publicado em: 10/05/2016
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16. SELECTIVE CATALYTIC REDUCTION (SCR) OF NO BY AMMONIA OVER V2O5/TiO2 CATALYST IN A CATALYTIC FILTER MEDIUM AND HONEYCOMB REACTOR: A KINETIC MODELING STUDY
Abstract The present study addresses a numerical modeling and simulation based on the available knowledge of SCR kinetics for prediction of NO conversion over a V2O3/TiO3 catalyst through a catalytic filter medium and honeycomb reactor. After introducing the NH3-SCR system with specific operational criteria, a reactor model was developed to evaluate the effe
Braz. J. Chem. Eng.. Publicado em: 2015-12
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17. Primary and Reflected Compaction Waves in a Foam Rod Due to an Axial Impact by a Small Mass
AbstractThe propagation of compaction waves in a stationary foam block subjected to an impact by a small mass is studied in order to examine the mechanism of compaction within the primary and reflected stress waves. The analysis is focused on aluminium strain rate insensitive foam that exhibits strain hardening under quasistatic compression. A theoretical ap
Lat. Am. j. solids struct.. Publicado em: 2015-05
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18. EFFECT OF NON-DARCY FLOW COEFFICIENT VARIATION DUE TO WATER VAPORIZATION ON WELL PRODUCTIVITY OF GAS CONDENSATE RESERVOIRS
Abstract Well productivity of gas condensate reservoirs is highly affected by near-wellbore phenomena. Inertial force resulting from convective acceleration of fluid particles in the medium, as well as viscous force, determines the flow of gas through porous media at high velocity. Pressure drop builds up the molar content of water in gas by water vaporizati
Braz. J. Chem. Eng.. Publicado em: 2015-03
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19. Muscular performance characterization in athletes: a new perspective on isokinetic variables
Background: Isokinetic dynamometry allows the measurement of several variables related to muscular performance, many of which are seldom used, while others are redundantly applied to the characterization of muscle function. Objectives: The present study aimed to establish the particular features of muscle function that are captured by the variables currentl
Braz. J. Phys. Ther.. Publicado em: 10/10/2014
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20. Effects of temperature-dependent viscosity on fluid flow and heat transfer in a helical rectangular duct with a finite pitch
An incompressible fully developed laminar flow in a helical rectangular duct having finite pitch and curvature with temperature-dependent viscosity under heating condition is studied in this work. Both the cases of one wall heated and four walls heated are studied. The cross-sectional dimensions of the rectangular duct are 2a and 2b. The aspect ratio n=2b/2a
Braz. J. Chem. Eng.. Publicado em: 2014-09
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21. Natural convection of nanofluids over a convectively heated vertical plate embedded in a porous medium
In this paper, the natural convective flow of nanofluids over a convectively heated vertical plate in a saturated Darcy porous medium is studied numerically. The governing equations are transformed into a set of ordinary differential equations by using appropriate similarity variables, and they are numerically solved using the fourth-order Runge-Kutta method
Braz. J. Chem. Eng.. Publicado em: 2014-06
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22. Observational Study of the Surface Layer at an Ocean-Land Transition Region
ABSTRACT: High-frequency measurements of wind, and temperature were made during the dry season of 2008 to study the development of an internal boundary layer at the main Brazilian space launching centre, Centro de Lançamento de Alcântara at Alcântara, Maranhão, Brazil. Turbulence measurements taken at the coast, in two different points 227 m apart show d
J. Aerosp. Technol. Manag.. Publicado em: 2013-12
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23. Microhabitat de Tolypothrix distorta Kütz. ex Bornet & Flahault (Microchaetaceae, Cyanophyta) em dois riachos da região Centro-Sul do Estado do Paraná, Brasil
This study aimed to evaluate some microhabitat characteristics of two populations of Tolypothrix distorta in streams from midsouthern region of Paraná State on a seasonal period. Each population was monthly investigated for the abundance of T. distorta and environmental variables such as depth, current velocity, irradiance, richness, and substrate diversity
Hoehnea. Publicado em: 2013-12
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24. Ultra baixo coeficiente de atrito no deslizamento de Si3N4-Al2O3. Efeitos da força aplicada, velocidade de deslizamento e temperatura do ensaio. / Ultra low friction coefficient in sliding of Si3N4-Al2O3. Effects of applied load, sliding velocity and test temperature.
Tribological tests were conducted in a ball on disk setup, using water as lubricant. Were used a silicon nitride ball and alumina disk. The tests were conducted to investigate the effects of sliding speed, applied load and temperature on friction coefficient. The silicon nitride balls and alumina disks were characterized by determining density, Vickers hardn
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012