2,924 research outputs found
On rank 2 vector bundles on Fano manifolds
In this work we deal with vector bundles of rank two on a Fano manifold
with . We study the nef and pseudoeffective cones of the
corresponding projectivizations and how these cones are related to the
decomposability of the vector bundle. As consequences, we obtain the complete
list of -bundles over that have a second
-bundle structure, classify all the uniform rank two vector
bundles on this class of Fano manifolds and show the stability of
indecomposable Fano bundles (with one exception on ).Comment: Updated version with an issue correcte
Nestings of rational homogeneous varieties
In this paper we study the existence of sections of universal bundles on
rational homogeneous varieties -- called nestings -- classifying them
completely in the case in which the Lie algebra of the automorphism group of
the variety is simple of classical type. In particular we show that, under this
hypothesis, nestings do not exist unless there exists a proper algebraic
subgroup of the automorphism group acting transitively on the base variety.Comment: Major revision of the exposition. To appear in Tranformation Group
Uniform families of minimal rational curves on Fano manifolds
It is a well-known fact that families of minimal rational curves on rational
homogeneous manifolds of Picard number one are uniform, in the sense that the
tangent bundle to the manifold has the same splitting type on each curve of the
family. In this note we prove that certain --stronger-- uniformity conditions
on a family of minimal rational curves on a Fano manifold of Picard number one
allow to prove that the manifold is homogeneous
Las ferias como escaparate de la comunicación empresarial
Novenes Jornades de Foment de la Investigació de la FCHS (Any 2003-2004)Análisis de la importancia de las ferias como escaparate de comunicación para las empresas, tomando
como ejemplo el sector del azulejo en la provincia de Castellón. Descripción y análisis de por qué se
acude a una feria y de los pasos a seguir desde la planificación de la asistencia hasta la finalización
de la misma.
Por otra parte, análisis de formatos de Relaciones Públicas a través de medios y soportes de comunicación
que utilizan las empresas en su asistencia
Advanced Electron Microscopy Techniques in Nanomaterials Characterization at NASA Glenn Research Center
In this chapter, the author will review several advanced microscopy techniques developed at the NASA Glenn Research Center in the last 5 years. Topical areas include: unconventional approach to investigate the fine nanoporous structure of aerogels by scanning electron microscopy, new limits for transmission electron microscopy investigation of dispersion and chirality of single-walled carbon nanotubes within a polymer matrix, the importance of microstructure of porous tin dioxide nanostructure that lead to first time detection of methane at room temperature without doping or catalyst, in situ SEM methods to study the thermal stability of nanoparticles on Graphene/Cu based materials, electron beam irradiation effects on carbon nanotube yarns electrical properties, and nanoindentation work of multiphase thermoelectric material
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