14,242 research outputs found
Model Predictive Regulation
We show how optimal nonlinear regulation can be achieved in a model
predictive control fashion
Intersection between class and gender and its effect on the quality of employment in Chile
Indexación: Web of Science; Scopus.En este artículo se analiza el efecto de la intersección entre clase y género sobre la calidad
del empleo en Chile. La medida de posición de clase utilizada está basada en la propuesta de
Erik O. Wright y la calidad del empleo en una medida multidimensional, que incluye un índice
de condiciones objetivas de empleo y dos índices de condiciones subjetivas (motivación en
el trabajo y percepción del control sobre el proceso de trabajo). Los resultados demuestran
que la clase y el género determinan diferencias significativas en la calidad objetiva y subjetiva
del empleo. Sin embargo, los datos también indican que el género (particularmente, el
hecho de ser mujer) no actúa necesariamente como “amplificador” de las desigualdades
de clase observadas en el mercado laboral. A partir de esto, al final del artículo se plantean
algunas reflexiones sobre cómo opera la intersección entre clase y género en el mercado
laboral chileno.This study explores the impact of the intersection between class and gender on the quality
of employment in Chile. The method used to measure social class position is based on the
work of Erik O. Wright, while, for the quality of employment, a multidimensional measurement
was used, including one index for objective working conditions and two indices for subjective
ones (motivation on the job and the perception of control over work processes). The results
demonstrate that class and gender give rise to signifcant differences in objective and
subjective job quality. However, the data also indicate that gender (more specifcally, the fact
of being female) does not necessarily amplify the class-based inequalities observed in the
labour market. Drawing on these fndings, a number of thoughts about how the class/gender
intersection operates in the Chilean labour market are shared in the fnal section of this studyhttp://hdl.handle.net/11362/4079
Matrix Ernst Potentials and Orthogonal Symmetry for Heterotic String in Three Dimensions
A new matrix representation for low-energy limit of heterotic string theory
reduced to three dimensions is considered. The pair of matrix Ernst Potentials
uniquely connected with the coset matrix is derived. The action of the symmetry
group on the Ernst potentials is established.Comment: 10 pages in LaTe
Charging a Double Kerr Solution in 5D Einstein--Maxwell--Kalb--Ramond Theory
We consider the low-energy effective action of the 5D
Einstein-Maxwell-Kalb-Ramond theory. After compactifying this truncated model
on a two-torus and switching off the U(1) vector fields of this theory, we
recall a formulation of the resulting three-dimensional action as a double
Ernst system coupled to gravity. Further, by applying the so-called normalized
Harrison transformation on a generic solution of this double Ernst system we
recover the U(1) vector field sector of the theory. Afterward, we compute the
field content of the generated charged configuration for the special case when
the starting Ernst potentials correspond to a pair of interacting Kerr black
holes, obtaining in this way an exact field configuration of the 5D
Einstein-Maxwell-Kalb-Ramond theory endowed with effective Coulomb and dipole
terms with momenta. Some physical properties of this object are analyzed as
well as the effect of the normalized Harrison transformation on the double Kerr
seed solution.Comment: 15 pages in latex, revised versio
String theory extensions of Einstein-Maxwell fields: the static case
We present a new approach for generation of solutions in the four-dimensional
heterotic string theory with one vector field and in the five-dimensional
bosonic string theory starting from the static Einstein-Maxwell fields. Our
approach allows one to construct the solution classes invariant with respect to
the total subgroup of the three-dimensional charging symmetries of these string
theories. The new generation procedure leads to the extremal
Israel-Wilson-Perjes subclass of string theory solutions in a special case and
provides its natural continuous extension to the realm of non-extremal
solutions. We explicitly calculate all string theory solutions related to
three-dimensional gravity coupled to an effective dilaton field which arises
after an appropriate charging symmetry invariant reduction of the static
Einstein-Maxwell system.Comment: 19 pages in late
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