76 research outputs found
Strumigenys Fairchildi Brown, 1961 (formicidae, Myrmicinae): First Record Of This Rarely Collected Ant From Brazil
Strumigenys fairchildi Brown, 1961 is recorded for the first time in Brazil. This ant species was previously known only from a few specimens collected in Costa Rica, Panama and Ecuador. The worker S. fairchildi was collected at the Parque Estadual do Cristalino, a continuous area of Amazon tropical rain forest protected for biodiversity conservation in the municipality of Novo Mundo, Mato Grosso state. In addition, we present a distribution map and high-resolution images of the worker. © 2016 Check List and Authors.12
Short-range interactions in a two-electron system: energy levels and magnetic properties
The problem of two electrons in a square billiard interacting via a
finite-range repulsive Yukawa potential and subjected to a constant magnetic
field is considered. We compute the energy spectrum for both singlet and
triplet states, and for all symmetry classes, as a function of the strength and
range of the interaction and of the magnetic field. We show that the
short-range nature of the potential suppresses the formation of ``Wigner
molecule'' states for the ground state, even in the strong interaction limit.
The magnetic susceptibility shows low-temperature paramagnetic peaks
due to exchange induced singlet-triplet oscillations. The position, number and
intensity of these peaks depend on the range and strength of the interaction.
The contribution of the interaction to the susceptibility displays paramagnetic
and diamagnetic phases as a function of .Comment: 12 pages,6 figures; to appear in Phys. Rev.
Pteridaceae (Polypodiopsida) do Campo Experimental da Embrapa Amazônia Oriental, município de Moju, estado do Pará, Brasil
Licófitas e monilófitas das Unidades de Conservação da Usina Hidroelétrica - UHE de Tucuruí, Pará, Brasil
Efeito da adição de própolis e monensina sódica na digestibilidade e características ruminais em bubalinos alimentados com dieta à base de forragem
Avaliação de variáveis climatológicas da cidade de Uberlândia (MG) por meio da análise de componentes principais
Consumo, digestibilidade e balanço de nitrogênio em ovinos alimentados com rações contendo torta de Crambe
Similaridade florística entre estratos da vegetação em quatro Florestas Estacionais Deciduais na bacia do Rio São Francisco
Síndromes de dispersão de Angiospermas em uma Unidade de Conservação na Caatinga, SE, Brasil
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