5,272 research outputs found
EPSTEIN, Edward; PION-BERLIN, David (eds). 2006. Broken Promises? The Argentine Crisis and Argentine Democracy. Lanham: Lexington Books, 288 pp.
Magnetic exchange mechanism for electronic gap opening in graphene
We show within a local self-consistent mean-field treatment that a random
distribution of magnetic adatoms can open a robust gap in the electronic
spectrum of graphene. The electronic gap results from the interplay between the
nature of the graphene sublattice structure and the exchange interaction
between adatoms.The size of the gap depends on the strength of the exchange
interaction between carriers and localized spins and can be controlled by both
temperature and external magnetic field. Furthermore, we show that an external
magnetic field creates an imbalance of spin-up and spin-down carriers at the
Fermi level, making doped graphene suitable for spin injection and other
spintronic applications.Comment: 5 pages, 5 figure
Morphological Description of Selected Pigeonpea (\u3ci\u3eCajanus cajan\u3c/i\u3e (L.) Millsp.) Lines
Seventeen pigeonpea pure line accessions selected for desirable forage traits and three commercial cultivars were described according to morphological characters. The following descriptors were used: growth habit, plant height, number of primary and secondary branches, stem color and thickness, leaf shape and hairiness, flower base and second color, pattern of flower streaks, flowering pattern, immature and mature pod color, pod form and hairiness, seed color pattern, base and second seed color, seed eye (region around hilum) color and seed shape and width. Each individual line and cultivar was satisfactorily distinguished from the others by the chosen characters
Segregation induced by inelasticity in a vibrofluidized granular mixture
We investigate the segregation of a dense binary mixture of granular
particles that only differ in their restitution coefficient. The mixture is
vertically vibrated in the presence of gravity. We find a partial segregation
of the species, where most dissipative particles submerge in the less
dissipative ones. The segregation occurs even if one type of the particles is
elastic. In order to have a complete description of the system, we study the
structure of the fluid at microscopic scale (few particle diameters). The
density and temperature pair distribution functions show strong enhancements
respect the equilibrium ones at the same density. In particular, there is an
increase in the probability that the more inelastic particles group together in
pairs (microsegregation). Microscopically the segregation is buoyancy driven,
by the appearance of a dense and cold region around the more inelastic
particles.Comment: 7 pages, 9 figures, accepted in Phys. Rev
Avaliação de genótipos e recomendação de cultivares de aveia para cobertura de solo, para a região central do Estado de São Paulo, no ano de 2008.
bitstream/CPPSE/17521/1/ComuTecnico82.pd
Avaliação de genótipos e recomendação de cultivares de aveia para cobertura de solo, na região Sudeste, para o ano de 2007.
bitstream/item/37336/1/Comunicado66.pd
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