14,119 research outputs found
Geodesics around line defects in elastic solids
Topological defects in solids, usually described by complicated boundary
conditions in elastic theory, may be described more simply as sources of a
gravity- like deformation field in the geometric approach of Katanaev and
Volovich. This way, the deformation field is described by non-Euclidean metric
that incorporates the boundary imposed by the defects. A possible way of
gaining some insight into the motion of particles in a medium with topological
defects (e.g., electrons in a dislocated metal) is to look at the geodesics of
the medium around the defect. In this work, we find the exact solution for the
geodesic equation for elastic medium with a generic line defect, the
dispiration, that can either be a screw dislocation or a wedge disclination for
particular choices of its parameters.Comment: 10 pages, Latex, 4 figures, accepted for publication in Phys. Lett.
Solid State Analog for He-McKellar-Wilkens Quantum Phase
In this letter we investigate the quantum dynamics of a quasiparticle in the
presence of a charged screw dislocation submitted to a uniform magnetic field.
Analysing the quantum scattering for this quasiparticle we observed the
appearance of a topological quantum phase in the solution and demonstrate that
this phenomenon is the solid state analog of the He-McKeller-Wilkens effect.Comment: 7 pages, epl styl
Técnica da enxertia de copa da seringueira.
Informacoes tecnicas sobre enxertia de copa de seringueira, envolvendo altura da enxertia, contagem das plantas aptas a enxertia, posicao da enxertia, epoca do ano, combinacoes copa/painel, colheita de hastes, procedimentos da enxertia, verificacao e decaptacao, operacoes pos-cecapitacao e coeficientes tecnicos.bitstream/CPAA-2009-09/2733/1/Com_Tec_14.pd
Desempenho de clones de copa de seringueira resistentes ao mal-das-folhas.
O objetivo deste trabalho foi avaliar o desempenho de 18 clones de seringueira resistentes ao Microcyclus ulei, usados como copas enxertadas
Determinação do nível de ploidía em cupuaçuzeiro sem sementes.
O objetivo deste trabalho é determinar o nível de ploidía do cupuaçuzeiro aspérmico
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