Search

Copyright of Revista de Economia e Sociologia Rural is the property of Sociedade Brasileira de Economia e Sociologia Rural and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The traditional sugar production associated with the growing ethanol production makes the sugarcane industry one of the main segments of the Brazilian economy; together the Brazilian industries of sugar and ethanol processed about 630 million tons of sugarcane in 2009, which generated approximately 142 million tons of bagasse. This work presents an economically and environmentally viable solution for the bagasse disposal through the controlled burn associated with the synthesis of carbon nanotubes (CNTs), materials that have a wide range of potential technological applications due to its exceptional properties. The pyrolysis process at 1000°C associated with a catalyst system were used to recover the generated gases as raw material for the synthesis of CNTs. Gaseous emissions were analyzed by chromatography and the produced materials were characterized with the use of SEM, TEM, TGA and Raman spectroscopy. Results showed that the catalyst application resulted in the reduction of gaseous emissions. Carbon nanotubes with lengths of 10-40 pn and diameters in the range of 20-50 nm were produced. [ABSTRACT FROM AUTHOR]

This paper is about creating value for Brazilian sugar and alcohol companies, as measured by EVA and MVA. We analyze the existence and the level of correlation between the EVA generated by sugar and alcohol companies (São Martinho, Cosan, Cosan Limited and Guarani), and their MVAs reached the market. The results showed the existence of correlation, statistically significant level of 5%, only to Cosan Limited. There is no significant correlation for three of the four companies examined. We conclude that EVA is not a consistent measure to signal the future behavior of the MVA of the companies [ABSTRACT FROM AUTHOR]