The objective of the survey was to evaluate the efficacy of 2 pheromones, in Cosmotrak traps, to control Cosmopolites sordidus Germar on banana orchards, in Terceira Island, Açores. The Cosmotrak traps with two pheromones were arranged in line, spaced by 20 meters. The pheromone cosmoplus has showed a greater efficacy than the pheromone sordidine, overcoming the pheromone sordidine by 41% from the captures of t...
Chestnut moth, Cydia splendana, is the most important pest affecting the chestnut production on Terceira Island, Azores, responsible by important damages at the quality level. To evaluate the economic impact of this pest, was determinated the fruits infestation rate on a sample of 500 fruits collected in each parcel, in total of 6 parcels 4 of them distributed at the southern part of the Island in the villages ...
Tese de mestrado em Matemática Financeira, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2010 ; Este trabalho tem por objectivo apresentar uma metodologia para o cálculo do preço de opções com barreiras, cuja monitorização desta é feita em tempo discreto. Esta técnica consiste na utilização das fórmulas fechadas de Black-Scholes, alterando o valor da barreira por uma constante que é f...
Financiadores do RCAAP | |||||||
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