Comportamento produtivo de oito clones de cajueiro-anão-precoce em cultivo de terceiro ano sob regime de sequeiro.

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Avaliação de clones de cajueiro-anão-precoce em cultivo de terceiro ano no semi-árido piauiense.

O objetivo deste trabalho foi avaliar o desempenho produtivo de oito clones de cajueiro anão precoce no semi-árido piauiense, visando identificar os mais promissores para a produção de castanha e caju para mesa..

Avaliação de clones de cajueiro-anão-precoce no cerrado do sul maranhense.

Avaliação de Clones de Cajueiro-Anão-Precoce no Cerrado do Sul Maranhense; Introdução; Desenvolvimento; Biometria; Produtividade; Características do fruto; Aptidão comercial; Distribuição média mensal da produção de castanha; Características agroeconômicas; Comercialização da produção; Comparativos econômicos.bitstream/item/37219/1/Doc145.pd

Desempenho econômico de clones de cajueiro-anão-precoce em cultivo de quarto ano de produção no município de Picos, PI.

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Avaliação de clones de cajueiro-anão precoce no município de Picos, PI, no período de 2000 a 2004.

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Thermochemical and Theoretical Studies of 2-Hydroxyquinoxaline, 2,3-Dihydroxyquinoxaline, and 2-Hydroxy-3-methylquinoxaline

The standard (p° = 0.1 MPa) molar enthalpies of formation for crystalline 2-hydroxyquinoxaline, 2,3-dihydroxyquinoxaline, and 2-hydroxy-3-methylquinoxaline were derived from the standard molar enthalpies of combustion, in oxygen, at T = 298.15 K, measured by static bomb combustion calorimetry. The standard molar enthalpies of sublimation, at T = 298.15 K, of the three compounds were measured by Calvet microcalorimetry. The derived standard molar enthalpies of formation in the gaseous phase are 45.9 ± 4.3 kJ·mol-1 for 2-hydroxyquinoxaline, −(179.2 ± 5.3) kJ·mol-1 for 2,3-dihydroxyquinoxaline, and −(8.8 ± 4.9) kJ·mol-1 for 2-hydroxy-3-methylquinoxaline. In addition, theoretical calculations using the density functional theory and the B3LYP/6-311G** hybrid exchange-correlation energy functional were performed for these molecules in order to obtain the most stable geometries and to access their relative stability. The theoretical results are in general good agreement with experimental findings

Irrigação do cajueiro-anão-precoce na região de Teresina.

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Waste polymers recycling in high performance asphalt mixtures

Building a road pavement requires large amounts of constituent materials, whose extraction can lead to the devastation of natural resources and causes negative impacts on the environment. As aggregates comprise nearly 90% of asphalt mixtures, their partial substitution by waste thermosetting polymers (12 million tons of waste polymers are presently mislaid into landfills, every year, in Europe) can be considered as a sustainable technology, given that an equivalent performance can be assured. Thus, this study aims on evaluating possible advantages of introducing polyethylene based wastes in asphalt mixtures, namely high density polyethylene (HDPE) and cross-linked polyethylene (PEX), incorporating HDPE as a bitumen modifier and PEX as partial substitute of the aggregates. The laboratory tests carried out in this work showed that the use of HDPE significantly improves the behavior of the asphalt binder/mixture. The use of PEX considerably decreases the density of the mixtures, which can be attractive to lighten structures. The mixtures with PEX have similar performance to the conventional one in terms of water sensitivity, improving the permanent deformation resistance and reducing the temperature susceptibility. In brief, the mixtures incorporating waste polymers could be considered a good technical and environmental alternative for paving works.Portuguese Foundation for Science and Technology (FCT) in the scope of the Strategic Project UI 4047 2011‐201