261 research outputs found
EL CONTEXTO COMPETITIVO NACIONAL Y LA RELEVANCIA ESTRATÉGICA DE LAS SUBSIDIARIAS DE CORPORACIONES ESTRANGERAS EN BRASIL
O propósito deste artigo é analisar a influência das condições do contexto competitivo no desenvolvimento de Subsidiárias com Relevância Estratégica (SRE) no Brasil. Foi realizada uma pesquisa de caráter exploratório com uma amostra de 118 das 1.000 maiores subsidiárias de capital estrangeiro no Brasil. Os resultados mostram que as políticas do governo desempenham um papel central para o desenvolvimento das SREs no país. Além disso, os setores com uma orientação competitiva global, em vez de puramente local, apresentam maior probabilidade de desenvolver SREs. Em oposição à literatura hegemônica, os fatores relacionados ao “diamante” da vantagem competitiva nacional (PORTER, 1990), não mostraram nenhuma correlação significativa com o desenvolvimento de SREs em uma grande economia em desenvolvimento, como a do Brasil.The main purpose of this exploratory research is analyzing how the conditions presented for the national competitive context influence the development of Subsidiaries with Strategic Relevance (SRS) in Brazil. For strategic relevance is understood to what extent the subsidiary is responsible for activities and competencies that of high increasing value for the corporation, and whether these activities and competencies are used by subsidiaries of the multinational corporation located in other countries For this, an exploratory research was carried out in a sample of 118 of the 1000 largest foreign subsidiaries in Brazil. The results show that government policies play a central role for the development of SRS in large developing economies. In addition, for globally oriented industries seems to be more feasible having SRS in these economies. In opposition to the hegemonic literature, the factors related to the 'diamond' of national competitive advantage (Porter, 1990), did not show correlation with the development of SRS in a large developing economy like Brazil.El presente articulo presenta una análisis del proceso de internacionalización sobre la óptica del diseño y dinámica organizacional. Así, en la literatura existe una evolución clara de aquellas propuestas de tipo funcional hasta aquellas mas recientes de tipo red (networks). Con esa intención se establecieron dos dimensiones de análisis: a) Las condicionantes, constituidas por las variables estrategia, ambiente, tecnología y cultura; b) Los componentes, conformados por las variables departamentalización, actividades de linea/asesoria, descripción de actividades, cadena jerárquica, nivel de centralización/descentralización, amplitud administrativa, comunicación y capacidad decisoria. Fue realizada una investigación exploratoria de tipo cualitativo, aplicada en un reconocido y exitoso grupo empresarial mexicano: CEMEX (Cementos Mexicanos S.A. de C.V.), el cual actúa en el mercado mundial de cementos, siendo considerado uno de los lideres del mismo. Se comprobó, con la investigación que existe una tendencia positiva en la aceptación y aplicación de esa nueva propuesta, lo que implica una profunda evolución de las características del diseño y dinámica organizacional
Pair-breaking quantum phase transition in superconducting nanowires
A quantum phase transition (QPT) between distinct ground states of matter is
a wide-spread phenomenon in nature, yet there are only a few experimentally
accessible systems where the microscopic mechanism of the transition can be
tested and understood. These cases are unique and form the experimentally
established foundation for our understanding of quantum critical phenomena.
Here we report the discovery that a magnetic-field-driven QPT in
superconducting nanowires - a prototypical 1d-system - can be fully explained
by the critical theory of pair-breaking transitions characterized by a
correlation length exponent and dynamic critical exponent . We find that in the quantum critical regime, the electrical
conductivity is in agreement with a theoretically predicted scaling function
and, moreover, that the theory quantitatively describes the dependence of
conductivity on the critical temperature, field magnitude and orientation,
nanowire cross sectional area, and microscopic parameters of the nanowire
material. At the critical field, the conductivity follows a
dependence predicted by phenomenological scaling theories and more recently
obtained within a holographic framework. Our work uncovers the microscopic
processes governing the transition: The pair-breaking effect of the magnetic
field on interacting Cooper pairs overdamped by their coupling to electronic
degrees of freedom. It also reveals the universal character of continuous
quantum phase transitions.Comment: 22 pages, 5 figure
Wilson loops stability in the gauge/string correspondence
We study the stability of some classical string worldsheet solutions employed
for computing the potential energy between two static fundamental quarks in
confining and non-confining gravity duals. We discuss the fixing of the
diffeomorphism invariance of the string action, its relation with the
fluctuation orientation and the interpretation of the quark mass substraction
worldsheet needed for computing the potential energy in smooth (confining)
gravity background. We consider various dual gravity backgrounds and show by a
numerical analysis the existence of instabilities under linear fluctuations for
classical string embedding solutions having positive length function derivative
. Finally we make a brief discussion of 't Hooft loops in
non-conformal backgrounds.Comment: 34 pages, 36 figures. Reference added. Final version JHEP accepte
The Baryonic Phase in Holographic Descriptions of the QCD Phase Diagram
We study holographic models of the QCD temperature-chemical potential phase
diagram based on the D3/D7 system with chiral symmetry breaking. The baryonic
phase may be included through linked D5-D7 systems. In a previous analysis of a
model with a running gauge coupling a baryonic phase was shown to exist to
arbitrarily large chemical potential. Here we explore this phase in a more
generic phenomenological setting with a step function dilaton profile. The
change in dilaton generates a linear confining potential and opposes
the screening effect of temperature. We show that the persistence of the
baryonic phase depends on the step size and that QCD-like phase diagrams can be
described. The baryonic phase's existence is qualitatively linked to the
existence of confinement in Wilson loop computations in the background.Comment: 21 pages, 7 figure
Holographic QCD: Past, Present, and Future
At the dawn of a new theoretical tool based on the AdS/CFT correspondence for
nonperturbative aspects of quantum chromodynamics, we give an interim review on
the new tool, holographic QCD, with some of its accomplishment. We try to give
an A-to-Z picture of the holographic QCD, from string theory to a few selected
top-down holographic QCD models with one or two physical applications in each
model. We may not attempt to collect diverse results from various holographic
QCD model studies.Comment: 80 pages, 18 figures, LaTeX; references added, published version +
appendi
Holographic c-theorems in arbitrary dimensions
We re-examine holographic versions of the c-theorem and entanglement entropy
in the context of higher curvature gravity and the AdS/CFT correspondence. We
select the gravity theories by tuning the gravitational couplings to eliminate
non-unitary operators in the boundary theory and demonstrate that all of these
theories obey a holographic c-theorem. In cases where the dual CFT is
even-dimensional, we show that the quantity that flows is the central charge
associated with the A-type trace anomaly. Here, unlike in conventional
holographic constructions with Einstein gravity, we are able to distinguish
this quantity from other central charges or the leading coefficient in the
entropy density of a thermal bath. In general, we are also able to identify
this quantity with the coefficient of a universal contribution to the
entanglement entropy in a particular construction. Our results suggest that
these coefficients appearing in entanglement entropy play the role of central
charges in odd-dimensional CFT's. We conjecture a new c-theorem on the space of
odd-dimensional field theories, which extends Cardy's proposal for even
dimensions. Beyond holography, we were able to show that for any
even-dimensional CFT, the universal coefficient appearing the entanglement
entropy which we calculate is precisely the A-type central charge.Comment: 62 pages, 4 figures, few typo's correcte
The Warden Attitude: An investigation of the value of interaction with everyday wildlife
Using a discrete choice experiment, we elicit valuations of engagement with ‘everyday wildlife’ through feeding garden birds. We find that bird-feeding is primarily but not exclusively motivated by the direct consumption value of interaction with wildlife. The implicit valuations given to different species suggest that people prefer birds that have aesthetic appeal and that evoke human feelings of protectiveness. These findings suggest that people derive wellbeing by adopting a warden-like role towards ‘their’ wildlife. We test for external validity by conducting a hedonic analysis of sales of bird food. We discuss some policy implications of the existence of warden attitudes
- …