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Upconversion cooling of Er-doped low-phonon fluorescent solids 

García Adeva, Angel Javier; Balda de la Cruz, Rolindes; Fernández Rodríguez, Joaquín Manuel (American Physical Society, 2009-01)
We report on a novel mechanism for laser cooling of fluorescent solids based on infrared-to-visible upconversion often found in rare-earth-doped low-phonon materials. This type of optical cooling presents some advantages ...
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Ab initio calculation of low-energy collective charge-density excitations in MgB2 

Silkin, Viatcheslav M.; Balassis, A.; Echenique Landiribar, Pedro Miguel; Tchoulkov Savkin, Evgueni Vladimirovich (American Physical Society, 2009-08)
We present ab initio time-dependent density-functional theory calculation results for low-energy collective electron excitations in MgB2. The existence of a long-lived collective excitation corresponding to coherent charge ...
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Dynamic optimization of track components to minimize rail corrugation 

Oyarzabal de Celis, Olatz; Gómez López, Josu; Santamaría Manrique, Javier; García Vadillo, Ernesto (Elsevier, 2009-01)
In this paper, the influence on corrugation of the most significant track parameters has been examined. After this parametric study, the optimization of the track parameters to minimize the undulatory wear growth has been ...
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Wheel-rail wear index prediction considering multiple contact patches 

Santamaría Manrique, Javier; García Vadillo, Ernesto; Oyarzabal de Celis, Olatz (Elsevier, 2009-06)
This paper shows a new wheel-rail contact model specially suited to obtain wear indexes between wheel and rail when the vehicle negotiates tight curves. The model presented in the paper enables introduction of the two ...
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Exchange-Correlation Hole of a Generalized Gradient Approximation for Solids and Surfaces 

Constantin, Lucian A.; Perdew, John P.; Pitarke de la Torre, José María (American Physical Society, 2009-02)
We propose a generalized gradient approximation (GGA) for the angle- and system-averaged exchange-correlation hole of a many-electron system. This hole, which satisfies known exact constraints, recovers the Perdew-Burke-Ernzerhof ...
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Position-dependent exact-exchange energy for slabs and semi-infinite jellium 

Horowitz, Claudio M.; Constantin, Lucian A.; Proetto, C. R.; Pitarke de la Torre, José María (American Physical Society, 2009-12)
The position-dependent exact-exchange energy per particle epsilon(x)(z) (defined as the interaction between a given electron at z and its exact-exchange hole) at metal surfaces is investigated, by using either jellium slabs ...

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AuthorConstantin, Lucian A. (2)García Vadillo, Ernesto (2)Oyarzabal de Celis, Olatz (2)Pitarke de la Torre, José María (2)... View MoreDepartamento (cas.)Física de la materia condensada (2)Ingeniería mecánica (2)Física aplicada I (1)Física de materiales (1)Departamento (eus.)Ingeniaritza mekanikoa (2)Materia kondentsatuaren fisika (2)Fisika aplikatua I (1)Materialen fisika (1)Subject
PHYSICS, CONDENSED MATTER (6)
ELECTRONIC, OPTICAL AND MAGNETIC MATERIALS (4)MECHANICS OF MATERIALS (2)ACOUSTICS (1)... View MoreDate Issued
2009 (6)
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eng (6)

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