1,721,015 research outputs found
Left ventricle segmentation in ultrasound sequences for the automatic computation of ejection fraction
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Magnetic Field Effect on the Pseudogap Temperature within Precursor Superconductivity
Full text linkWe determine the magnetic-field dependence of the pseudogap closing temperature T within a
precursor superconductivity scenario. Detailed calculations with an anisotropic lattice model with
d-wave superconductivity account for a recently determined experimental relation in BSCCO between
the pseudogap closing field and the pseudogap temperature at zero field, as well as for the weak initial
dependence of T at low fields. Our results indicate that the available experimental data are fully
compatible with a superconducting origin of the pseudogap in cuprate superconductors
The genus of the configuration spaces for Artin groups of affne type
Full text linkLet be a Coxeter system, finite, and let be the associated Artin group.
One has {\it configuration spaces} where and a natural -covering The {\it Schwarz genus} is a natural topological invariant to consider. In \cite{salvdec2} it was computed for all finite-type Artin groups, with the exception of case (for which see \cite{vassiliev},\cite{salvdecproc3})
The problem for the Artin group of type and its cohomology
No full textWe prove that the complement to the affine complex arrangement of type Bn is a K(π,1) space. We also compute the cohomology of the affine Artin group GBn (of type Bn) with coefficients in interesting local systems. In particular, we consider the module Q[q±1 , t±1], where the first n standard generators of GBn act by (−q)-multiplication while the last generator acts by (−t) multiplication. Such a representation generalizes the analogous 1-parameter representation related to the bundle structure over the complement to the discriminant hypersurface, endowed with the monodromy action of the associated Milnor fibre. The cohomology of GBn with trivial coefficients is derived from the previous one
Shape analysis, semantic annotation and context modelling for the retrieval of 3D anatomical structures.
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