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Search Results: 1 - 10 of 351389 matches for " E. C.;Aguiar "
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óptica e geometria dinamica
Aguiar, C.E.;
Revista Brasileira de Ensino de Física , 2009, DOI: 10.1590/S1806-11172009005000005
Abstract: dynamic geometry software has played a major role in the renewal of geometry teaching that occurred in recent years. these computer programs produce visually accurate representations of geometrical objects and relations, which can be manipulated with simple point-and-click mouse operations. in this paper we discuss how dynamic geometry programs can be transformed into environments for learning geometrical optics. in particular, we suggest that well known conceptual difficulties frequently encountered by students of this discipline may be reduced with help of dynamic geometry. we show examples of how reflection and refraction phenomena can be studied with these tools.
Aquisi??o de dados usando Logo e a porta de jogos do PC
Aguiar, C. E.;Laudares, F.;
Revista Brasileira de Ensino de Física , 2001, DOI: 10.1590/S1806-11172001000400003
Abstract: a data acquisition system using the game port of an ibm-pc running windows is described. the programs for data acquisition and analysis are all written in logo. the system is used to measure the period of a pendulum as function of the oscillation amplitude.
Aquisi o de dados usando Logo e a porta de jogos do PC
Aguiar C. E.,Laudares F.
Revista Brasileira de Ensino de Física , 2001,
Abstract: Descrevemos um sistema de aquisi o de dados baseado na porta de jogos do IBM-PC com plataforma Windows. Os programas de aquisi o e análise s o totalmente escritos na linguagem Logo. O sistema é utilizado para medir o período de um pêndulo como fun o da amplitude de oscila o.
Nonextensive Statistics and Multiplicity Distribution in Hadronic Collisions
C. E. Aguiar,T. Kodama
Physics , 2002, DOI: 10.1016/S0378-4371(02)01656-4
Abstract: The multiplicity distribution of particles in relativistic gases is studied in terms of Tsallis' nonextensive statistics. For an entropic index q>1 the multiplicity distribution is wider than the Poisson distribution with the same average number of particles, being similar to the negative binomial distribution commonly used in phenomenological analysis of hadron production in high-energy collisions.
Listening to the coefficient of restitution and the gravitational acceleration of a bouncing ball
C. E. Aguiar,F. Laudares
Physics , 2002, DOI: 10.1119/1.1524166
Abstract: We show that a well known method for measuring the coefficient of restitution of a bouncing ball can also be used to obtain the gravitational acceleration.
A aerodinamica da bola de futebol
Aguiar, C.E.;Rubini, G.;
Revista Brasileira de Ensino de Física , 2004, DOI: 10.1590/S1806-11172004000400003
Abstract: we study the aerodynamic forces acting on a soccer ball. analyzing the video of a famous shot by pelé, we show that a curious phenomenon, the drag crisis, greatly influenced the motion of the ball. the magnus effect, caused by the rotation of the ball, was also important to the outcome of the kick. using a computer code that simulates the flight of balls we discuss several aspects of pelé's shot and of soccer physics, in particular bending kicks and didi's dry leaf.
Rutherford scattering with radiation damping
C. E. Aguiar,F. A. Barone
Physics , 2005, DOI: 10.1119/1.3065026
Abstract: We study the effect of radiation damping on the classical scattering of charged particles. Using a perturbation method based on the Runge-Lenz vector, we calculate radiative corrections to the Rutherford cross section, and the corresponding energy and angular momentum losses.
Spinodal instability in the quark-gluon plasma
Aguiar, C. E.;Fraga, E. S.;Kodama, T.;
Brazilian Journal of Physics , 2004, DOI: 10.1590/S0103-97332004000200037
Abstract: we investigate the onset of spinodal decomposition in a relativistic fluid of quarks coupled to a nonequilibrium chiral condensate. studying small fluctuations around equilibrium, we identify the role played by sound and chiral waves in the generation of unstable modes.
Spinodal instability in the quark-gluon plasma
Aguiar C. E.,Fraga E. S.,Kodama T.
Brazilian Journal of Physics , 2004,
Abstract: We investigate the onset of spinodal decomposition in a relativistic fluid of quarks coupled to a nonequilibrium chiral condensate. Studying small fluctuations around equilibrium, we identify the role played by sound and chiral waves in the generation of unstable modes.
Hydrodynamical instabilities in an expanding quark gluon plasma
C. E. Aguiar,E. S. Fraga,T. Kodama
Physics , 2003, DOI: 10.1088/0954-3899/32/2/009
Abstract: We study the mechanism responsible for the onset of instabilities in a chiral phase transition at nonzero temperature and baryon chemical potential. As a low-energy effective model, we consider an expanding relativistic plasma of quarks coupled to a chiral field, and obtain a phenomenological chiral hydrodynamics from a variational principle. Studying the dispersion relation for small fluctuations around equilibrium, we identify the role played by chiral waves and pressure waves in the generation of instabilities. We show that pressure modes become unstable earlier than chiral modes.
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