Hot Brownian carriers in the Langevin picture: Application to a simple model for the Gunn effect in GaAs

We consider a charged Brownian gas under the influence of external, static and uniform electric and magnetic fields, immersed in a uniform bath temperature. We obtain the solution for the associated Langevin equation, and thereafter the evolution of the nonequilibrium temperature towards a nonequilibrium (hot) steady state. We apply our results to a simple yet relevant Brownian model for carrier transport in GaAs. We obtain a negative differential conductivity regime (Gunn effect) and discuss and compare our results with the experimental results. © 2013.

Uruguay Round issues: elements of a multilateral framework for trade in services

Comenta varios elementos propuestos durante las negociaciones en el Grupo de Negociaciones en Servicios de la Ronda Uruguay. Incluye en anexos un examen del curso de las negociaciones, conceptos amplios e instrumentos internacionales relevantes para ellas y modelos que contienen algunos elementos para un marco multilateral del comercio en servicios.

Elementos para una política ambiental eficaz = Elements for an effective environmental policy

Incluye Bibliografía

A figura humana fragmentada na pintura: Tiradentes esquartejado em Pedro Américo e Adriana Varejão

Pós-graduação em Artes - IA

Population, social equity and changing production patterns

Includes bibliography

Bressonianos: comprovando a influência do fotógrafo francês Henri Cartier-Bresson sobre fotojornalistas brasileiros atuais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

História oral e Educação Matemática: um estudo, um grupo, uma compreensão a partir de várias versões

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Compartimentação morfotectônica da Alta Mogiana Paulista (Nordeste do Estado de São Paulo)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Urban crisis: conceptual elements of an environmental approach

Includes bibliography

Competitividade territorial do etanol

Pós-graduação em Geografia - IGCE

Logistic platforms: conceptual elements and the role of the public sector

This edition of the FAL Bulletin approaches the issue of logistic platforms and the public sector’s role in the development of the logistic sector.

Measuring the impact of quality infrastructure in Latin America: Experiences, achievements and limitations

This document, which is partly based on by the study Impacto de la Infraestructura de la Calidad en América Latina, is a second joint effort by the Economic Commission for Latin America and the Caribbean (ECLAC) and the German National Metrology Institute (PTB) to move towards a more detailed understanding of the role played by the Quality Infrastructure in opening up possibilities for the countries in the region to innovate and compete. Through methodological analysis and the realization of case studies at the national level in certain countries in the region, the document seeks to offer a more comprehensive picture of the impact of the Quality Infrastructure and its importance for the economic and social development of countries. The document analyzes various QI related aspects, with particular emphasis on a review of conceptual elements, the role of the QI in the innovation systems of countries and a brief analysis of a set of case studies in Latin American countries. It also identifies a series of challenges and limitations for carrying out impact studies. These elements are taken up again in the final conclusions of the book, where a number of policy recommendations are outlined.

Insumos demográficos para el sector educacional: América Latina, población en edad escolar, edades simples y años calendarios 1980-2000 = Demographic elements for the education sector: Latin America, school-age population, single ages and calendar years 1980-2000

Publicación bilingüe (Español e inglés)