Now showing items 1-10 of 430
Radiating cylindrical collapse
(Physics Letters A, 1991-07-22) [Artigo]
The junction conditions for a collapsing cylindrically symmetric source described by a viscous dissipative fluid that conducts heat and produces radiation with outgoing unpolarized radiation are studied. © 1991.
A single statistic for monitoring the covariance matrix of bivariate processes
(Quality Engineering, 2012-01-01) [Artigo]
In this article, we present a new control chart for monitoring the covariance matrix in a bivariate process. In this method, n observations of the two variables were considered as if they came from a single variable (as a ...
Efeito da concentração do catalisador acetilacetonato férrico na cura de poliuretano à base de polibutadieno líquido hidroxilado (PBLH) e diisocianato de isoforona (IPDI)
(Química Nova, 2002-05-01) [Artigo]
The reaction between hydroxy-terminated polybutadiene and isophorone diisocyanate constitutes the base of the curing process of the most composite solid propellant used in the propulsion of solid rocket propellant. In this ...
Effect of WC-10%Co-4%Cr coating on the Ti-6Al-4V alloy fatigue strength
(Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 2009-05-15) [Artigo]
High strength/weight ratio and effective corrosion resistance are primary reasons to use titanium alloys replacing steel and aluminum in some aeronautical components. However, titanium alloys have poor tribological properties, ...
Fluctuating solutions for the evolution of domain walls
(Physics Letters B, 2009-08-17) [Artigo]
A class of oscillating Lorentz-covariant configurations for the evolution of the domain walls in diverse dimensions are analytically obtained. It is shown that the oscillating solutions in the case of domain walls are ...
Spinless bosons embedded in a vector Duffin-Kemmer-Petiau oscillator
(Physics Letters A, 2011-07-04) [Artigo]
Some properties of minimal and nonminimal vector interactions in the Duffin-Kemmer-Petiau (DKP) formalism are discussed. The conservation of the total angular momentum for spherically symmetric nonminimal potentials is ...
Characterization of high density polyethylene (HDPE) reinforced with banana peel fibers
(BioResources, 2013-05-01) [Artigo]
Lignocellulosic fibers from banana peels were washed with water in order to increase their compatibility with a polymeric matrix, and their properties were compared with unwashed fibers. Washed banana fibers were mixed ...
Disclosing the generic behavior of topological solutions: An orbit-based approach
(EPL, 2012-04-01) [Artigo]
In this work we present a method, based on the vacuum structure of the potential for a system of two nonlinearly coupled scalar fields in 1+1 space-time dimensions, which yields complete information about the behavior of ...
Mass generation for Abelian spin-1 particles via a symmetric tensor
(Physics Letters B, 2012-02-01) [Artigo]
In the topologically massive BF model (TMBF) the photon becomes massive via coupling to an antisymmetric tensor, without breaking the U(1) gauge symmetry. There is no need of a Higgs field. The TMBF model is dual to a ...
Scattering and bound states of spin-0 particles in a nonminimal vector double-step potential
(Canadian Journal of Physics, 2012-05-01) [Artigo]
The problem of spin-0 particles subject to a nonminimal vector double-step potential is explored in the context of Duffin-Kemmer-Petiau theory. Surprisingly, one can never have an incident wave totally reflected, and the ...