Carbon monoxide oxidation over platinum: Stable, oscillatory and quasi-chaotic regimes

We model the heterogeneously catalyzed oxidation of CO over a Pt surface. A phase diagram analysis is used to probe the several steady state regimes and their stability. We incorporate an experimentally observed 'slow' sub-oxide kinetic step, thereby generalizing a previously presented model. In agreement with experimental data, stable, oscillatory and quasi-chaotic regimes are obtained. Furthermore, the inclusion of the sub-oxide step yields a relaxation oscillation regime. © 1998 Elsevier Science B.V. All rights reserved.

O Plano Real e outras experiências internacionais de estabilização

Incluye Bibliografía

Construir eqüidade desde a infância e a adolescência na Ibero-América

Incluye Bibliografía

Globalização e desenvolvimento

Incluye Bibliografía

Recursos naturais na União das Nações Sul-americanas (UNASUL): Situação e tendências para uma agenda de desenvolvimento regional

Incluye Bibliografía

Impact of changes in the European Union import regimes for sugar, banana and rice on selected CARICOM countries

Includes bibliography

Development cycles, political regimes and international migration: Argentina in the 20th century

Includes bibliography

Andean exchange-rate regimes, 1994-2003: a brief for stable but flexible" regimes"

Includes bibliography

Two stops in today's new global geographies: shaping novel labor supplies and employment regimes

Includes bibliography

Adoção da tecnologia da informação em organizações rurais: O caso da pecuária de corte

Adoption of technology. Farm management. Beef cattle breeding. Information technology.This research is aimed to study the use and the diffusion of IT in the beef cattle breeding from the analysis of the factors that have influenced its adoption as well as to describe resources, procedures, and necessary actions for IT operation using case studies in rural properties classified by the innovativeness degree. This study was carried out in two stages, quantitative and qualitative. In the first stage, a survey with producers was conducted. Information concerning the different technologies adopted enabled to identify the level of innovativeness of those producers. They were classified according to the similarities of the technological position. The second stage analyzed experiences, opinions, and perspectives regarding the technology integrated to the productive system. Two rural cattle breeding farms were analyzed in each category through personal interviews totalizing ten case studies. The results indicated the reasons for the adoption or rejection of a certain IT by the producers allowing for the identification of the reasons why some producers have adopted it more quickly than others. It was possible to understand the rural organization modifications due to IT adoption, for example, managerial skills improvements. In general, the processes have been improved and become easier bringing positive effects to several areas including human resources and the enterprise's image in the market.

Entre a Amnésia e a Vontade de nada Esquecer: notas sobre regimes de historicidade e história oral

In this paper we intend to sketch a configuration of the research practices of the Research Group Oral History and Mathematics Education (GHOEM) and, in general terms, to explain some concepts and procedures in which these practices are founded. In order to do this, the expression Regimes of Historicity - meaning the different ways of articulating the notions of present, past and future - is initially mobilized. By this expression we are able to understand the emergence of the discourse that underpins a set of actions and theoretical frameworks for the research in Mathematics Education and more particularly, for the Historiography of Mathematics Education.

A contribuição marxista para o estudo das relações internacionais

The article examines the marxist contribution to the study of international relations stressing the historical dimension in the social groups and political economy as a fundamental variable. Thus, marxism provides resources to a comprehensive analysis of international relations, deconstructing the concept of state as is understood by the dominant theories in the area.

Reestruturação industrial: reflexões sobre autonomia tecnológica e relações econômicas internacionais

Incluye Bibliografía

Sectoral regimes, productivity and international competitiveness

Includes bibliography

Exchange rate regimes and macroeconomic performance in Argentina, Brazil and Mexico

Includes bibliography