Invariant conserved currents in gravity theories with local Lorentz and diffeomorphism symmetry

We discuss conservation laws for gravity theories invariant under general coordinate and local Lorentz transformations. We demonstrate the possibility to formulate these conservation laws in many covariant and noncovariant(ly looking) ways. An interesting mathematical fact underlies such a diversity: there is a certain ambiguity in a definition of the (Lorentz-) covariant generalization of the usual Lie derivative. Using this freedom, we develop a general approach to the construction of invariant conserved currents generated by an arbitrary vector field on the spacetime. This is done in any dimension, for any Lagrangian of the gravitational field and of a (minimally or nonminimally) coupled matter field. A development of the regularization via relocalization scheme is used to obtain finite conserved quantities for asymptotically nonflat solutions. We illustrate how our formalism works by some explicit examples. © 2006 The American Physical Society.

Three-phase four-wire circuits interpretation by means of different power theories

In order to contribute to the discussion of defining a generalized power theory, valid for unbalanced and non linear circuits, this paper discusses the relationship and discrepancies among four modern power theories. Three-phase four-wire circuits, under different conditions, have been analyzed, since the most conflicting and intriguing interpretations take place in case of return conductor occurrence. Simulation results of different load, power supply and line conditions will be discussed in order to elucidate the author's conclusions and to provoke the readers for additional discussions. © 2010 IEEE.

Internationalization strategies in Iberoamerica: the case of Portuguese trade

Includes bibliography

¿A Chilean wine cluster? governance and upgrading in the phase of internationalization

Includes bibliography

Os novos espaços de acumulção do Grupo Votorantim

This article aims to getting at the recent changes in Brazilian industrial capitalism, especially the expansion of companies and business groups abroad. The analyzed theme is the Votorantim Group, one of the most important groups in the country and Latin America. The Group acts in several branches of the economy and it has recently invested in the acquisition of foreign companies in different business and countries. In this article, the theories of internationalization of companies and business groups and the path of the Votorantim Group are focused - from its origin to productive internationalization. The secondary data were compiled from annual reports of the group, specialized magazines and newspapers.

Modernization and foreign trade in the health services

Includes bibliography

Theories and metaphors on territorial development

Includes bibliography

Latin America and the internationalization of the world economy

Includes bibliography

The internationalization of Latin American industrial firms

Includes bibliography

The neoclassical theories of economic liberalism

Includes bibliography

ECLAC and the new growth theories

Includes bibliography

Two challenges for the twenty-first century: achieving financial discipline and putting the internationalization process in order

Includes bibliography

The agricultural machinery industry in Argentina: from restructuring to internationalization?

Includes bibliography

Internationalization and technology in MERCOSUR

Includes bibliography