Instruções sobre coleta e envio de material para laboratório de entomologia.

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Ocorrência da broca-do-dendezeiro nas microrregiões de Picos, Parnaíba e Teresina - PI.

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Variations of the Energy of Free Particles in the pp-Wave Spacetimes

We consider the action of exact plane gravitational waves, or pp-waves, on free particles. The analysis is carried out by investigating the variations of the geodesic trajectories of the particles, before and after the passage of the wave. The initial velocities of the particles are non-vanishing. We evaluate numerically the Kinetic energy per unit mass of the free particles, and obtain interesting, quasi-periodic behaviour of the variations of the Kinetic energy with respect to the width $\lambda$ of the gaussian that represents the wave. The variation of the energy of the free particle is expected to be exactly minus the variation of the energy of the gravitational field, and therefore provides an estimation of the local variation of the gravitational energy. The investigation is carried out in the context of short bursts of gravitational waves, and of waves described by normalised gaussians, that yield impulsive waves in a certain limit.Comment: 20 pages, 18 figures, further arguments supporting the localizability of the gravitational energy are presented, published in Univers

Manejo integrado da mosca branca (Bemisia argentifolii Bellows & Perring) em feijão caupi.

A mosca branca na cultura do feijão caupi; Manejo da mosca branca; Manejo e controle da mosca branca em feijão caupi.bitstream/item/36275/1/Cir24.pd

Levantamento e intensidade de ocorrência de insetos nocivos e seus inimigos naturais em culturas temporárias.

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Ocorrência de Banisia myrsusalis (Walker, 1895) atacando sapotizeiro na Região dos Tabuleiros Costeiros do Estado do Piauí.

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Ocorrência de Zamagiria laidion (Lepidoptera: Pyralidae) atacando sapotizeiros na Região dos Tabuleiros Costeiros do Piauí.

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Manejo da mosca-branca-do-cajueiro com óleos vegetais.

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Preços agrícolas no estado de Rondônia, 1993-1998.

Preços do café em Rondônia, no Brasil e no mundo; Preços do feijão em Rondônia e no Brasil;bitstream/item/91367/1/60910001.pd