2,927 research outputs found
Nonlinear trend stationarity of real exchange rates: the case of the Mediterranean countries
The aim of this article is to provide additional evidence on the fulfilment of the Purchasing Power Parity hypothesis in the so-called Mediterranean countries. In order to test for the empirical validity of such hypothesis, we have applied two types of unit root tests. The first group is due to Bierens (1997) who generalizes the alternative hypothesis to nonlinear trend stationariry and, the second is the Leybourne, Newbold and Vougas (1998) approach that uses a nonlinear specification for the intercept and slope in order to detrend the series. The results suggest that the evidence in favour of the Purchasing Power Parity hypothesis increases when we allow for nonlinear alternatives
Bosonic D=11 supergravity from a generalized Chern-Simons action
It is shown that the action of the bosonic sector of D=11 supergravity may be
obtained by means of a suitable scaling of the originally dimensionless fields
of a generalized Chern-Simons action. This follows from the eleven-form
CS-potential of the most general linear combination of closed, gauge invariant
twelve-forms involving the sp(32)-valued two-form curvatures supplemented by a
three-form field. In this construction, the role of the skewsymmetric
four-index auxiliary function needed for the first order formulation of
supergravity is played by the gauge field associated with the five Lorentz
indices generator of the bosonic sp(32) subalgebra of osp(1|32).Comment: Misprints corrected, to appear in NPB plain latex, no figures, 25
page
La manipulación genética y su incidencia en el derecho matrimonial canónico: breves reflexiones.
Material incluido en el volumen especial de la revista del Instituto Martín de Azpilcueta, Universidad de Navarra : Ius Canonicum (1999), en honor de Javier Hervada
Condiciones ambientales y diferenciación social en los patrones de movilidad: el caso de las desigualdades de género en el Área Metropolitana de Lisboa
Place determinants and social dimensions interact to produce mobility patterns. The article
seeks to measure to what extent the physical and social conditions of the residency place modulate
the intensity of mobility particularly in what concerns gender inequalities. To do so, we first present
the theoretical framework, which guides our perspective on mobility inequalities and the geographical
focus: Lisbon Metropolitan Area (LMA). Secondly, using logistic regression on representative data
from a survey to LMA inhabitants we elaborate on the concept of environmental motility and its
relationship to various types of inequality. Lastly, we systematize a view on accumulated inequalities
examining how local environments may increase the mobilities gender gap.info:eu-repo/semantics/publishedVersio
Surfactant effect in heteroepitaxial growth. The Pb - Co/Cu(111) case
A MonteCarlo simulations study has been performed in order to study the
effect of Pb as surfactant on the initial growth stage of Co/Cu(111). The main
characteristics of Co growing over Cu(111) face, i.e. the decorated double
layer steps, the multiple layer islands and the pools of vacancies, disappear
with the pre-evaporation of a Pb monolayer. Through MC simulations, a full
picture of these complex processes is obtained. Co quickly diffuses through the
Pb monolayer exchanging place with Cu atoms at the substrate. The exchange
process diffusion inhibits the formation of pure Co islands, reducing the
surface stress and then the formation of multilayer islands and the pools of
vacancies. On the other hand, the random exchange also suppress the nucleation
preferential sites generated by Co atoms at Cu steps, responsible of the step
decoration.Comment: 4 pages, latex, 2 figures embedded in the tex
- …