Now showing items 1-10 of 104
Approximate analytic expression for the eigenenergies of the anharmonic oscillator V(x)=Ax6+Bx2
(Physical Review A, 1995-12-01) [Artigo]
An approximate analytic expression for the eigenenergies of the anharmonic oscillator V(x)=Ax6+Bx2 is introduced, starting from particular analytic solutions which are valid when certain relations between the parameters A ...
A simple action for a free fractional spin particle
(Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1997-11-27) [Artigo]
By studying classical realizations of the sl(2, R-fraktur sign) algebra in a two dimensional phase space (q,π), we have derived a continuous family of new actions for free fractional spin particles in 2 + 1 dimensions. For ...
Mechanical behaviour of strain aged dual phase steels
(Materials Science and Technology, 1999-10-01) [Artigo]
Dual phase steels, characterised by good formability and excellent surface finish, are suitable for applications where processing involves cold deformation. In this context an investigation has been conducted into the cold ...
Annihilation, glueball and flavor mixing effects in pseudoscalar mesons
(European Physical Journal C, 1999-12-01) [Artigo]
The pseudoscalar mesons η(547), η′(958) and η″(1410) are studied in the gluonium-quarkonium mixing framework. The SU(3)-flavor symmetry breaking and annihilation effects are considered. Estimates of the glueball mass and ...
Three-dimensional reconstruction of fracture surfaces: Area matching algorithms for automatic parallax measurements
(Scanning, 1999-07-01) [Artigo]
This paper describes two solutions for systematic measurement of surface elevation that can be used for both profile and surface reconstructions for quantitative fractography case studies. The first one is developed under ...
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.
Labdane dimers from Xylopia aromatica
(Phytochemistry, 1999-07-01) [Artigo]
From the stem bark of Xylopia aromatica (Annonaceae), have been isolated two new labdane dimers as their methyl esters, together with the known compounds ent-labda-8(17),13(16),14-trien-18-oic acid, sitosterol and stigmasterol. ...
Analytical and semi-analytical analysis of an artificial satellite's rotational motion
(Celestial Mechanics & Dynamical Astronomy, 1999-01-01) [Artigo]
The rotational motion of an artificial satellite is studied by considering torques produced by gravity gradient and direct solar radiation pressure. A satellite of circular cylinder shape is considered here, and Andoyers ...
Resonance and chaos .2. Exterior resonances and asymmetric libration
(Astronomy & Astrophysics, 1997-12-01) [Artigo]
The motion of a test particle in the vicinity of exterior resonances is examined in the context of the planar, circular, restricted three-body problem. The existence of asymmetric periodic orbits associated with the 1 : n ...
Fuel cell cogeneration system: a case of technoeconomic analysis
(Renewable & Sustainable Energy Reviews, 1999-06-01) [Artigo]
Fuel Cell is the emerging technology of cogeneration, and has been applied successfully in Japan, U.S.A. and some OECD countries. This system produces electric power by an electrolytic process, in which chemical substances ...