Stream network analysis and geomorphic flood plain mapping from orbital and suborbital remote sensing imagery application to flood hazard studies in central Texas

The author has identified the following significant results. Development of a quantitative hydrogeomorphic approach to flood hazard evaluation was hindered by (1) problems of resolution and definition of the morphometric parameters which have hydrologic significance, and (2) mechanical difficulties in creating the necessary volume of data for meaningful analysis. Measures of network resolution such as drainage density and basin Shreve magnitude indicated that large scale topographic maps offered greater resolution than small scale suborbital imagery and orbital imagery. The disparity in network resolution capabilities between orbital and suborbital imagery formats depends on factors such as rock type, vegetation, and land use. The problem of morphometric data analysis was approached by developing a computer-assisted method for network analysis. The system allows rapid identification of network properties which can then be related to measures of flood response

Ctenarytaina eucalypti (Maskell, 1890) (Hemiptera, Psyllidae) em eucaliptos no Brasil.

É reportada a ocorrência do psilídeo Ctenarytaina eucaypti (Maskell, 1890) (Hemiptera, Psyllidae), praga de origem Australiana, recentemente observada em Colombo, Paraná. Este psilídeo foi observado causando danos em folhas e brotações de mudas de E. dunnii. São relatados os danos, distribuição geográfica, biologia e control

Scanning Tunneling Microscope Operating as a Spin-diode

We theoretically investigate spin-polarized transport in a system composed of a ferromagnetic Scanning Tunneling Microscope (STM) tip coupled to an adsorbed atom (adatom) on a host surface. Electrons can tunnel directly from the tip to the surface or via the adatom. Since the tip is ferromagnetic and the host surface (metal or semiconductor) is non-magnetic we obtain a spin-diode effect when the adatom is in the regime of single occupancy. This effect leads to an unpolarized current for direct bias (V > 0) and polarized current for reverse (V < 0) bias voltages, if the tip is nearby the adatom. Within the nonequilibrium Keldysh technique we analyze the interplay between the lateral displacement of the tip and the intra adatom Coulomb interaction on the spindiode effect. As the tip moves away from the adatom the spin-diode effect vanishes and the currents become polarized for both V > 0 and V < 0. We also find an imbalance between the up and down spin populations in the adatom, which can be tuned by the tip position and the bias. Finally, due to the presence of the adsorbate on the surface, we observe spin-resolved Friedel oscillations in the current, which reflects the oscillations in the calculated LDOS of the subsystem surface+adatom.Comment: 11 pages, 4 figures. Submitte

Lymantria dispar (Linnaeus, 1758) (Lepidoptera: Lymantriidae) - a mariposa cigana - análise de risco de introdução de praga florestal potencialmente quarentenária no Brasil.

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Pineus boerneri (Hemiptera: Adelgidae) - pulgão-lanígero-do-pínus - praga introduzida em plantios de Pinus spp. no Brasil.

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Eulachnus rikeyi (Williams, 1911) (Hemiptera: Aphididae) - praga introduzida em plantios de Pinus spp. no Brasil.

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Anoplophora glabripennis Motschulsky (Coleoptera: Cerambycidae: Lamiinae) espécie potencialmente quarentenária para o Brasil.

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Alimentação de bezerros com extrato hidrossolúvel de soja. II. Produção de anticorpos e distúrbios intestinais.

O Objetivo do trabalho foi avaliar a substituição total do sucedâneo lácteo à base de proteína de leite (SL) por extrato hidrossolúvel de soja (EHS) na alimentação de bezerros Holandeses machos, com idade média inicial de cinco dias. Os bezerros alimentados com EHS apresentaram diminuição visível das gorduras presentes no tecido subcutâneo, omento, epíplon e da gordura perirenal. No abomaso, a principal alteração verificada foi a falta de formação do coágulo do EHS ingerido