The effect of heating temperature on the properties of vermiculites from Tanzania with respect to potential agronomic applications

This study was carried out to assess the properties of vermiculites from Tanzania with respect to the temperature used to expand them. Vermiculites from five locations in the Mozambique Belt of Tanzania were sampled and heated at 15, 200, 400, 600 and 800 °C in a muffle furnace. Palabora Europe Ltd provided one sample for comparison from their South Africa deposit which provides vermiculite used worldwide as a soil amendment. Water release characteristic, cation exchange capacity, pH, mass loss, and bulk density were among the properties assessed. All six vermiculites responded differently on heating, and had a significant variation in their agronomic properties. Water release characteristic varied with the degree of exfoliation and phase composition. Although vermiculites from Tanzania expanded on heating, their capacity to retain plant available water was relatively low as compared to vermiculite from Palabora. Disintegration on heating and the presence of a high amount of iron could be among the factors affecting their water release characteristic. Loss of hydroxyl water was higher in vermiculites than in hydrobiotites. Dehydroxylation enhanced the availability of exchangeable K⁺ and reduced significantly the cation exchange capacity of vermiculites. The optimum exchangeable K⁺ was obtained on heating at a temperature of 600 °C. The pH was unaffected by heating to a temperature of less than 600 °C. At higher temperature, the pH increased in some samples and was accompanied by substantial amounts of exchangeable Mg²⁺. Thus, it was concluded that initial characterization of vermiculites is essential prior to potential agricultural applications in order to optimize their agronomic potential. © 2008 Elsevier B.V. All rights reserved.

A Student Composers' Recital, May 7, 1959 8:30pm

Concert program for A Student Composers' Recital, May 7, 1959

A Tradução reinventada em The Invention of Solitude de Paul Auster

A leitura da obra de Paul Auster, desde os primeiros poemas e ensaios até à mais recente ficção, revela uma constante reflexão metalinguística e metaficcional sobre o trabalho da escrita. Auster equaciona o problema da escrita enquanto acto, permitindo ao leitor acompanhar e participar desse processo de construção. A narrativa e a linguagem intelectualizam-se, tornam-se conscientes, o que possibilita uma aproximação privilegiada ao ensino da tradução de textos literários através da própria literatura. The Invention of Solitude é como uma arte poética inspirada na experiência efectiva do sujeito, enquanto escritor e tradutor. Podemos considerá-lo um romance-manifesto em duas partes (Portrait of an Invisible Man e The Book of Memory), com especial incidência na exploração analítica da cena da escrita, utilizando a personagem-escritor e suas vivências como cobaia neste processo de auto e heteroconhecimento. A partir da análise aplicada de The Invention of Solitude, este artigo irá remeter também para os ensaios de Ernest Gellner sobre Wittgenstein em Language and Solitude, entre outros escritores que se debruçaram igualmente sobre questões ligadas à tradução literária, como Dryden, Goethe, Nietzsche, Benjamin, Ortega y Gasset e Octávio Paz.

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1900 (A21).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1916 (A37).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1892 (A13).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1913 (A34).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1899 (A20).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1880 (A1).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1896 (A17).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1893 (A14).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1888 (A9).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1885 (A6).

Recueil périodique de législation, de doctrine et de jurisprudence en matière de procédure civile, commerciale, criminelle et administrative / publié par MM. Rodolphe Rousseau,... Laisney,...

1901 (A22).