841 resultados para ECONOMIC ASPECTS


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Incluye Bibliografía

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Fuel cells are electrochemical energy conversion devices that convert fuel and oxidant electrochemically into electrical energy, water and heat. Compared to traditional electricity generation technologies that use combustion processes to convert fuel into heat, and then into mechanical energy, fuel cells convert the hydrogen and oxygen chemical energy into electrical energy, without intermediate conversion processes, and with higher efficiency. In order to make the fuel cells an achievable and useful technology, it is firstly necessary to develop an economic and efficient way for hydrogen production. Molecular hydrogen is always found combined with other chemical compounds in nature, so it must be isolated. In this paper, the technical, economical and ecological aspects of hydrogen production by biogas steam reforming are presented. The economic feasibility calculation was performed to evaluate how interesting the process is by analyzing the investment, operation and maintenance costs of the biogas steam reformer and the hydrogen production cost achieved the value of 0.27 US$/kWh with a payback period of 8 years. An ecological efficiency of 94.95%, which is a good ecological value, was obtained. The results obtained by these analyses showed that this type of hydrogen production is an environmentally attractive route. © 2013 Elsevier Ltd.

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Includes bibliography

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The present edition of the Economic Survey of Latin America and the Caribbean, annual publication that appears every year since 1948, consists of three parts and one statistical appendix. The first part of the Survey covers the main aspects of the regional economy from a sectorial and thematic perspective. Chapter 1 deals with the situation of the first half of 2002 and the prospects for the year as a whole, and it is a corrected version of what was previously published separately with the title 2002: Current Conditions and Outlook. In the second chapter the evolution of the regional economy in 2001 is analyzed. The third chapter reviews some macroeconomic subjects, specially important in the present economic context of the region. The second part contains information of the analysis of the economic performance of the 19 countries of Latin America and the Spanish-speaking Caribbean and Haiti during 2001 and early 2002. The country reports include tables and figures of the main economic indicators. The third part is dedicated to the remaining countries of the Caribbean, mainly English-speaking countries.

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This article presents three stylized facts that characterized the evolution of labour markets in Latin America and the Caribbean in the period 2003-2012 and represented breaks from previous trends. It is argued that these changes have to do with the economic and production context and the political and institutional framework. We show how the magnitude and patterns of economic growth impact on the nature of job creation, especially on shifts within and between economic sectors and the various segments of different productivity levels. We emphasize how changes in labour institutions have contributed to the evolution of labour indicators and, lastly, look at recent advances and persistent weaknesses in labour performance, as well as a number of risks to the continuity of recent favourable labour trends.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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One of the biggest challenges today is to develop clean fuels, which do not emit pollutant and with viable implementation. One of the options currently under study is the hydrogen production process. In this context, this work aims to study the technical and economical aspects of the incorporation process of hydrogen producing by ethanol steam reforming in the sugar cane industry and MCFC (molten carbonate fuel cell) application on it to generate electric power. Therefore, it has been proposed a modification in the traditional process of sugar cane industry, in order to incorporate hydrogen production, besides the traditional products (sugar, ethylic, hydrated and anhydric alcohol). For this purpose, a detailed theoretical study of the ethanol production process, describing the considerations to incorporate the hydrogen production will be performed. After that, there will be a thermodynamic study for analysing the innovation of this production chain, as well as a study of economic engineering to allocate the costs of products of the new process, optimising it and considering the thermoeconomics as being as an analysis tool. This proposal aims to improve Brazil's position in the ranking of international biofuels, corroborating the nation to be a power in the hydrogen era. (C) 2013 Elsevier Ltd. All rights reserved.