Perfect Fluid
Mostrando 1-12 de 42 artigos, teses e dissertações.
-
1. "I ALWAYS KNEW IT... DIGO, QUIZÁS NO ERA PERFECT": TRANSNATIONAL ACTS OF IDENTITY IN THE SPEECH OF A RETURNEE MIGRANT
RESUMO O artigo a seguir aborda o tema de transnacionalismo no território estadunidense de Porto Rico. Como uma colônia espanhola antes de virar território dos EUA, Porto Rico oferece um campo rico para o estudo de identidades fluidas. Embora a literatura transnacionalista tenha tipicamente focado em descrever contextos de "fronteiras" cruzadas ou cultura
Trab. linguist. apl.. Publicado em: 25/04/2019
-
2. Entropy variation in isothermal fluid flow considering real gas effects
Abstract The present paper concerns on the estimative of the pressure loss and entropy variation in an isothermal fluid flow, considering real gas effects. The 1D formulation is based on the isothermal compressibility module and on the thermal expansion coefficient in order to be applicable for both gas and liquid as pure substances. It is emphasized on the
J. Aerosp. Technol. Manag.. Publicado em: 2011-04
-
3. Sobre algumas soluções das equações de Einstein com constante cosmológica
In this work, through appropriate coordinate transformations and using Einsteins equations of the general relativity, we show a method to get, from the Minkowski metric, the metric of Friedmann-Lemaıtre-Robertson-Walker, used in cosmology, with the energy-momentum tensor of a perfect isotropic fluid. We obtain also an apparently new solution to Einstein
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2010
-
4. Bianchi type I tilted cosmological model for barotropic perfect fluid distribution with heat conduction in general relativity
Bianchi Type I tilted cosmological model for barotropic perfect fluid distribution with heat conduction is investigated.To get the deterministic solution, we have assumed barotropic condition p = γ ∈ ,0 < γ < 1, p being isotropic pressure, ∈ the matter density and a supplementary condition between metric potentials A, B, C as A = (BC)n where n is the c
Brazilian Journal of Physics. Publicado em: 2010-09
-
5. Kinematic self-similar solutions of locally rotationally symmetric spacetimes
This paper contains locally rotationally symmetric kinematic self-similar perfect fluid and dust solutions. We consider three families of metrics which admit kinematic self-similar vectors of the first, second, zeroth and infinite kinds, not only for the tilted fluid case but also for the parallel and orthogonal cases. It is found that the orthogonal case gi
Brazilian Journal of Physics. Publicado em: 2010-06
-
6. Energy in an expanding universe in the teleparallel geometry
The main purpose of this paper is to explicitly verify the consistency of the energy-momentum and angular momentum tensor of the gravitational field established in the Hamiltonian structure of the Teleparallel Equivalent of General Relativity (TEGR). In order to reach these objectives, we obtained the total energy and angular momentum (matter plus gravitatio
Brazilian Journal of Physics. Publicado em: 2010-03
-
7. LRS Bianchi type -V cosmology with heat flow in scalar: tensor theory
In this paper we present a spatially homogeneous locally rotationally symmetric (LRS) Bianchi type -V perfect fluid model with heat conduction in scalar tensor theory proposed by Saez and Ballester. The field equations are solved with and without heat conduction by using a law of variation for the mean Hubble parameter, which is related to the average scale
Brazilian Journal of Physics. Publicado em: 2009-12
-
8. Implications of a decay law for the cosmological constant in higher dimensional cosmology and cosmological wormholes
Higher dimensional cosmological implications ofa decay law for the cosmological constant term are analyzed. Three independent cosmological models are explored mainly: 1) - In the first model, the effective cosmological constant was chosen to decay with times like Λeffective = Ca-2 + D(b/a i)² where aiis an arbitrary scale factor characterizing the isotropi
Brazilian Journal of Physics. Publicado em: 2009-09
-
9. Waves in nuclear matter / Ondas na matéria nuclear
Assuming that nuclear matter can be treated as a perfect fluid, we study the propagation of perturbations in the baryon density. The equation of state is derived from a relativistic mean field model, which is a variant of the non-linear Walecka model. The expansion of the Euler and continuity equations of relativistic hydrodynamics around equilibrium configu
Publicado em: 2009
-
10. Two simple families of exact inhomogeneous stiff cosmologies
Two families of exact simple solutions of Einstein field equations for inhomogeneous stiff cosmologies are presented. The method to obtain the solutions is based on the introduction of auxiliary functions in order to cast the Einstein equations in such a way that can be explicitly integrated. Although the equations are mathematically equivalent to the equati
Brazilian Journal of Physics. Publicado em: 2008-03
-
11. Soluções das equações de campo de Einstein para fluidos perfeitos estáticos com simetria esférica
Nesta dissertação, procuramos soluções exatas das equações de campo de Einstein em Relatividade Geral que descrevem um fluido perfeito em um espaço-tempo estático com simetria esférica. A técnica utilizada para encontrar essas soluções é o algoritmo de Kovacic, que pode ser aplicado a equações diferenciais ordinárias lineares e homogêneas de
Publicado em: 2008
-
12. Accelerating solutions of perfect fluid hydrodynamics for initial energy density and life-time measurements in heavy ion collisions
A new class of accelerating, exact, explicit and simple solutions of relativistic hydrodynamics is presented. Since these new solutions yield a finite rapidity distribution, they lead to an advanced estimate of the initial energy density and life-time of high energy heavy ion collisions. Accelerating solutions are also given for spherical expansions in arbit
Braz. J. Phys.. Publicado em: 2007-06