Artigos científicos, teses e dissertações
Publicados nas melhores instituições de ensino

Abstract: Biomass is an important component of the Brazilian energy matrix, with a potential contribution of co-products from thinned forests. The aim of this work was to evaluate the energy balance and CO2 potential emission in mechanized biomass harvesting operations in Pinus ...

The use of biomass for power generation is currently a possibility to unify the paradigm of sustainable development as well as to bring new chances of social and economic development. In the scope of the sources of renewable energy included in the Program of Incentive for Alterna...

Biomass was the dominating source of energy for human activities until the middle 19th century, when coal, oil, gas and other energy sources became increasingly important but it still represents ca. 10% of the worldwide energy supply. The major part of biomass for energy is still...

The forest exploitation for energy purposes in Brazil, is frequently practiced in an inefficient and predatory way, causing serious environmental damages and high costs during transportation, handling and storage. ln this context, the main objective of this research was to invest...

This work had as objective the study of the economic viability for the Euterpe oleraceas Mart. (açaí) seed use as energy resource in the city of Belém-PA. Initially, it was realized a field survey of the sail points and quarters of biggest production of açaí, carrying through aft...

Due to the Brazilian population and economic growth, the national grid is in continuous change in order to meet the country needs. During the last decade, the highlights are the thermoelectric generation expansion, first by natural gas plants growth and recently by alternative re...

ABSTRACT This work aimed to evaluate the elemental composition of different biomass components of the forest species Acacia mearnsii De Wild, Eucalyptus grandis W. Hill ex Maiden, Mimosa scabrella Benth and Ateleia glazioviana Baill, at their first, third and fifth year after pla...

Abstract Coal and biomass are energy sources with great potential for use in Brazil. Coal-biomass co-gasification enables the combination of the positive characteristics of each fuel, besides leading to a cleaner use of coal. The present study evaluates the potential of co-gasifi...

Propionate consumption was studied in syntrophic batch and chemostat cocultures of Syntrophobacter fumaroxidans and Methanospirillum hungatei. The Gibbs free energy available for the H2-consuming methanogens was <−20 kJ mol of CH4−1 and thus allowed the synthesis of 1/3 mol of AT...

Biomass is a renewable energy source most used in the world, however, depending on the chemical properties and origin of the material used as biofuel, the amount of ash generated during combustion can be high, harming the energetic harnessing. The objective of this study was to c...

The use of renewable sources of energy is a worldwide trend and is being increasingly widespread, mainly for environmental and economic reasons. Biomass has become one of the most commonly used renewable sources of energy in the last years. Many of the biomass fuels used today co...

In Pará State, almost 21% of its population has no access to use of electric energy in their residence. To this universe belongs the target audience from this report, that are the isolated communities. Due the large territorial extension and hydrographic basin in Pará State, this...

The dependence of fossil fuels is still very evident and the search for alternative environmentally fuels that can reduce this dependency need investment. In this sense, biomass has an important role as a renewable energy source quite exploited on our planet. However, the use of ...

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ABSTRACT The tobacco production requires annually a large volume of firewood used in the cure process of tobacco leaves, representing up to 10% of its production cost. An alternative is the use of agroindustry residues, such as sawdust or pellets. The objective of this study was ...

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The energy mix in Brazil is dominated by petroleum products and renewable energy, including hydroelectric energy and biomass. Energy consumption in the domestic sector follows a similar pattern as the national trend, with a third of energy coming from biomass (mostly wood), a thi...

2010...

Gluconacetobacter diazotrophicus PAL3 was grown in a chemostat with N2 and mixtures of xylose and gluconate. Xylose was oxidized to xylonate, which was accumulated in the culture supernatants. Biomass yields and carbon from gluconate incorporated into biomass increased with the r...

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ABSTRACT Biomass is an important energy source, since it considers wastes discarded by other productive processes as inputs. As such, the determination of the most relevant variables, within an institutional dimension, exerts a significant influence to point out actions that shou...